Coffee outlet nozzle sliding assembly and coffee machine

Abstract

The utility model 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 machine, 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 utility model belongs to the technical field of coffee machines, and particularly relates to a coffee spout sliding assembly and a coffee machine. Background Art

[0002] Currently, most coffee machine milk frothing systems use air valves to control the opening and closing of air inlets, which cannot control the amount of air intake and is also costly.

[0003] Some simple coffee machine milk frothing systems use a simple milk frothing structure without an air valve. However, this milk frothing structure can only froth milk but cannot simultaneously froth milk or adjust the air intake volume, thus failing to meet customer product requirements. Utility Model Content

[0004] In order to solve the above technical problems, 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 utility model provides the following technical solutions:

[0006] In the first aspect, the utility model 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 tube joint rotatably connected to one side of the fresh milk heating chamber. The fresh milk heating chamber comprises a mixing chamber and a connecting pipe connected to one side of the top of the mixing chamber. An air intake adjustment hole is provided on the inner wall of the connecting pipe. A central channel for fresh milk to enter is provided inside the milk tube joint, and an air channel is provided outside the milk tube joint. Air enters the central channel from the air channel. Rotating the milk tube joint changes the contact area between the air channel and the air intake adjustment hole, thereby adjusting the opening of the air channel. The opening of the air channel ranges 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 provided 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 provided 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 smaller than the depth of the second air inlet groove.

[0011] Furthermore, the inner wall hole in the area on the connecting pipe corresponding to the air inlet hole of the milk pipe connector is the air inlet regulating hole; the air inlet regulating hole is composed of a large arc surface, a small arc surface, and two gradually changing 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 gradually changing arc surface is between the radius of the large arc surface and the radius of the small arc surface, and the diameter of the gradually changing arc surface changes from small to large when transitioning 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, forming 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, with no gap and no air intake space; the diameter of the gradually changing arc surface changes from small to large, and the gap formed between the inner wall of the fresh milk heating chamber corresponding to the gradually changing 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 rotary 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] Secondly,

[0016] The utility model also provides a coffee machine, comprising the aforementioned coffee spout sliding assembly, and the coffee machine can perform milk frothing and milk beating actions.

[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 tube joint, an air channel is provided outside the milk tube joint, and air enters the central channel from the air channel; fresh milk is transported from the central channel inside the milk tube joint into the fresh milk heating chamber, an air channel is provided outside the milk tube joint, and air enters the central channel from the air channel, the milk tube 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 air channel opening is zero, only milk is frothed, when the air channel is greater than zero, milk foam can be made, and the milk foaming effect changes with the change of the air channel opening, the utility model can achieve both milk foaming and milk frothing, and can adjust the amount of air intake to change the milk foaming effect.

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

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

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

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

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

[0024] Figure 5 For the utility model Figure 3 Right view;

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

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

[0027] Figure 8 For the utility model Figure 7 The main view;

[0028] Figure 9 For the utility model Figure 8 Cross-sectional view after cutting in the BB direction;

[0029] Figure 10 For the utility model Figure 8Cross-sectional view after cutting in CC direction;

[0030] Figure 11 For the utility model Figure 8 Cross-sectional view after cutting in DD direction;

[0031] Figure 12 This is one of the structural diagrams of the milk pipe connector of the present utility model;

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

[0033] Figure 14 For the utility model Figure 12 The main view;

[0034] Figure 15 For the utility model Figure 14 Cross-sectional view after cutting in the EE direction;

[0035] Figure 16 For the utility model Figure 14 The cross-sectional view after cutting in the FF direction;

[0036] Figure 17 For the utility model Figure 14 Cross-sectional view after cutting in the GG direction;

[0037] Figure 18 This is a structural diagram of the connection between the milk pipe joint, the fresh milk heating chamber, and the coffee outlet of the present invention;

[0038] Figure 19 For the utility model Figure 18 The main view;

[0039] Figure 20 For the utility model Figure 19 A cross-sectional view after cutting in the HH direction;

[0040] Figure 21 For the utility model Figure 20 A magnified view of point A;

[0041] Figure 22 For the utility model Figure 19 A cross-sectional view after cutting in the II direction;

[0042] Figure 23 This is a front view of the milk pipe connector connected to the fresh milk heating chamber of the present invention;

[0043] Figure 24 This is a cross-sectional view of the milk pipe connector of the utility model connected to the fresh milk heating chamber in the JJ direction, with the rotating handle facing vertically downward;

[0044] Figure 25 This is a cross-sectional view of the milk pipe connector of the utility model connected to the fresh milk heating chamber in the JJ direction, with the rotating handle in a horizontal state;

[0045] Figure 26 This is a cross-sectional view of the milk pipe connector of the utility model connected to the fresh milk heating chamber in the JJ direction, with the rotating handle in a tilted state;

[0046] Figure 27 This is a schematic structural diagram of a coffee machine according to embodiment 2 of the present invention;

[0047] Figure 28 For the utility model Figure 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 gradient arc surface; 136 is the air inlet adjustment hole;

[0050] 140 is the milk tube connector; 141 is the rotating handle; 142 is the air inlet groove 1; 143 is the air inlet groove 2; 144 is the air inlet hole; 145 is the matching pipe; 146 is the matching pipe body; 147 is the convex ring 1; 148 is the convex ring 2; 149 is the center channel; 1411 is the air inlet; 150 is the nozzle middle frame; 151 is the nozzle sleeve; 160 is the steam nozzle; 170 is the steam delivery pipe; 180 is the coffee delivery pipe; 190 is the hot water delivery pipe; 200 is the nozzle front cover; 210 is the nozzle back plate; 220 is the sealing ring; 300 is the touch panel assembly; 400 is the 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. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0052] It should be noted that the terms "center", "up", "down", "horizontal", "left", "right", "front", "back", "lateral", "longitudinal", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0053] Example 1

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

[0055] The main body 100 of the coffee spout sliding assembly includes a coffee spout opening 110, a milk froth spout opening 120 located in the middle of the coffee spout opening 110, a fresh milk heating chamber 130 connected to the top of the milk froth spout opening 120, a milk pipe connector 140 connected to one side of the fresh milk heating chamber 130, and a spout middle frame 150 connected to the top of the coffee spout opening 110. A sealing ring 220 is provided between the coffee spout opening 110 and the spout middle frame 150. The front side of the spout middle frame 150 is snap-fitted to the spout front cover 200, and the rear side of the spout middle frame 150 is snap-fitted to the spout back plate 210. The spout front cover 200 and spout back plate 210 serve as the outer shell of the coffee spout sliding assembly 100. The milk pipe connector 140 delivers fresh milk and air to the fresh milk heating chamber 130, ultimately delivering hot milk or milk froth through the milk froth spout opening 120.

[0056] The top of the coffee spout 110 communicates with a coffee delivery tube 180 connected to the rear side of the spout midframe 150. Liquid coffee can be delivered to the coffee spout 110 through this silicone hose. The top of the coffee spout 110 also communicates with a hot water delivery tube 190, also located on the rear side of the spout midframe 150. This hot water delivery tube 190 also uses a silicone hose and delivers hot water to the coffee spout 110.

[0057] Combine Figure 5-Figure 6 As shown, a steam nozzle 160 is connected to the top of the milk heating chamber 130. This nozzle 160 is housed within a nozzle sleeve 151 integrally formed on the front side of the nozzle middle frame 150. A steam delivery pipe 170, made of high-pressure-resistant reticulated silicone tubing, is connected to the top of the nozzle sleeve 151. Based on the Venturi principle, high-pressure steam enters the steam delivery pipe 170 and is ejected from the steam nozzle 160, generating negative pressure within the milk heating chamber 130.

[0058] Combine 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 connector 140 connected to the interior of the connecting pipe 132. The milk pipe connector 140 is used to receive fresh milk and air. The negative pressure generated by the fresh milk heating chamber 130 draws the fresh milk and air received by the milk pipe connector 140 into the mixing chamber 131.

[0059] Combine Figure 12-17As shown, the milk tube connector 140 includes a central channel 149 provided internally for conveying fresh milk and air. A mating pipe 145 is provided externally of the central channel 149, and a rotary handle 141 connected to the rear end of the mating pipe 145. The mating pipe 145 extends into the connecting pipe 132, and the two are mated 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 2 148 are arranged at intervals. The convex ring 147 is located on the side close to the rotating handle 141, and the convex ring 2 148 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 2 143 is provided on the convex ring 2 148. The air inlet groove 142 and the air inlet groove 2 143 are staggered. An air inlet hole 144 is provided on the matching pipe body 146 at the front end of the convex ring 2 148. 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 channel. Figure 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 cavity 131 to mix with the fresh milk.

[0061] Combine Figures 18-26 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 first air inlet groove 142 and the interior of the connecting pipe 132. Air then flows 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 second air inlet groove 143 and the interior of the connecting pipe 132. After reaching the air inlet hole 144, the air flows through the entire air channel and enters the central channel 149 of the milk tube connector 140. Finally, the air enters 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, thereby changing the opening of the air inlet hole 144.

[0063] Specific, combined Figures 8-11As shown, the air intake adjustment hole 136 is composed of a large arc surface 133, a small arc surface 134, and two gradually changing arc surfaces 135 connecting the large arc surface 133 and the small arc surface 134. The radius of the large arc surface 133 is larger than the radius of the small arc surface 134, and the radius of the gradually changing arc surface 135 is between the radii of the large arc surface 133 and the radii of the small arc surface 134. The diameter of the gradually changing arc surface 135 changes from small to large as it transitions from the small arc surface 134 to the large arc surface 133.

[0064] like Figure 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 chamber 130 and the milk tube connector 140 are interference fit, with no gap and no air intake space; the diameter of the gradually changing arc surface 135 changes from small to large, so that the gap formed between the inner wall of the fresh milk heating chamber 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 handle 141, the opening of the air inlet 144 is changed, and the air inlet 144 and the air inlet adjustment hole 136 may have three situations:

[0066] 1) The air inlet 144 and the large arc surface 133 completely coincide with each other: Figure 24 As shown, when the rotary handle 141 is in the vertically downward position, the air inlet 144 completely overlaps with the large arc surface 133, and there is a gap between the air inlet 144 and the inner wall of the connecting pipe 132. The air inlet 144 is in a fully open state, and the air channel is unobstructed. Air can smoothly enter the central channel 149 of the milk tube connector 140 from the air inlet 144, and then be sucked into the mixing chamber 131 of the fresh milk heating chamber 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 coincide with each other: Figure 25 As shown, when the rotary 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 is squeezed by the inner wall of the connecting pipe 132, and the air inlet 144 is in a completely closed state. The air passage is blocked, and 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 chamber 131, and no air is sucked in. Finally, the milk froth outlet 120 discharges hot milk.

[0068] 3) The air inlet 144 and the gradual arc surface 135 completely overlap: Figure 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 gradually curved surface 135. The surface of the air inlet 144 is partially squeezed and sealed against the inner wall of the fresh milk heating chamber 130, while a portion of the space is open, and the air passage is partially blocked. 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 ratio of hot fresh milk.

[0069] Working principle:

[0070] 1. According to the Venturi principle, high-pressure steam ejected from a small aperture creates negative pressure around the aperture. The present invention utilizes this principle by designing a small-hole pipe next to the aperture (i.e., the milk pipe connector 140 located on one side of the steam nozzle 160). The negative pressure generated by the steam nozzle 160 in the milk heating chamber 130 draws in refrigerated milk and air from the milk pipe connector 140. After the milk and steam / air fully collide in the mixing chamber 131, hot milk / milk foam is generated, which ultimately flows out of the milk foam outlet 120.

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

[0072] Example 2

[0073] Combine Figure 27 、 Figure 28 As shown, the present invention provides a coffee machine, comprising the coffee spout sliding assembly body 100 of Example 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-frothing operations.

[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 removed 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 utility model, rather than to limit the scope of protection of the utility model. Simple modifications or equivalent replacements of the technical solution of the utility model by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the utility model.

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 adjustment hole is provided on the inner wall of the connecting pipe. 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. Air enters the central channel from the air channel. Rotating the milk pipe joint changes the contact area between the air channel and the air intake adjustment hole, thereby adjusting the opening of the air channel. The opening of the air channel ranges 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 provided 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 provided 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.

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 connector is the air inlet regulating hole; the air inlet regulating hole is composed of a large arc surface, a small arc surface, and two gradually changing 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 gradually changing arc surface is between the radius of the large arc surface and the radius of the small arc surface, and the diameter of the gradually changing arc surface changes from small to large when transitioning 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, forming 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, with no gap and no air intake space; the diameter of the gradually changing arc surface changes from small to large, and the gap formed between the inner wall of the fresh milk heating chamber corresponding to the gradually changing 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, wherein: After turning the rotating handle, the air intake hole completely overlaps with the large arc surface, the air intake hole is open, and the air passage is unobstructed; or the air intake hole overlaps with the small arc surface, the air intake hole is in a completely closed state, and the air passage is blocked; or the air intake hole completely overlaps with the gradient arc surface, the air intake 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, the top of the coffee outlet is connected with a coffee delivery pipe, and the top of the coffee outlet is also connected with a hot water delivery pipe.

10. A coffee machine, characterized in that: The coffee machine comprises the coffee spout sliding assembly according to claim 9, and is capable of frothing milk and beating milk.

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