CN220185899U - Pressure relief drain valve and coffee machine with same - Google Patents

Abstract

The utility model provides a pressure relief drain valve, which comprises a valve body and a valve core, wherein a first waste discharge channel, a water inlet channel, a water supply channel and a second waste discharge channel are arranged on the outer wall of the valve body, one end of the valve core is connected with an elastic element, so that the valve core always has a trend of moving towards one end far away from a valve cavity, and the communication state among a plurality of channels can be switched by providing axial acting forces with different magnitudes for the lower end of the valve core, thereby realizing the discharge of waste water at the front end of a boiler before brewing, the water supply of a brewing cavity and the discharge of waste water after brewing. The utility model also provides a coffee machine comprising the pressure relief drain valve. The utility model provides a pressure relief drain valve and a coffee machine with the same, which can realize the advanced pressure relief of a brewing device and the drainage of waste water, so that hot water splashing can not occur when a brewing cavity in the coffee machine descends and is separated from a brewing head; meanwhile, the front-end waste water in the boiler can be discharged, and the brewing effect is improved.

Description

Pressure relief drain valve and coffee machine with same

Technical Field

The utility model relates to the technical field of coffee machines, in particular to a pressure relief drain valve and a coffee machine with the same.

Background

The existing coffee machine generally comprises a hot water boiler and a brewing device, wherein a corresponding brewing cavity and a brewing head for supplying hot water are arranged in the brewing device, the brewing cavity can vertically move up and down, a water supply station and a powder inlet station are correspondingly arranged in a brewing device shell, specifically, when the brewing cavity descends to the lower limit position of the brewing device shell, coffee powder enters the brewing cavity, then the brewing cavity ascends to the upper limit position, a water inlet of the brewing cavity is matched with the brewing head, and hot water in the boiler enters the brewing cavity through the brewing head to brew the coffee powder. After the brewing is finished, the brewing cavity moves downwards again, then the brewing head and the waste water in the water supply pipe are discharged, and in the existing structure, the hot water is added into the brewing cavity to be brewed and then the high-temperature and high-pressure environment is formed, so that the condition that water splashes when the brewing cavity descends and is separated from the brewing head can occur, and the internal environment of the coffee machine is influenced.

Therefore, the applicant designs a pressure relief drain valve, which is additionally provided with a waste discharge channel, so that the effect of pressure relief and waste discharge can be achieved, namely, when the brewing cavity is moved downwards to the brewing head to push away after brewing, waste water in the brewing device and residual hot water in the brewing head can be discharged through the waste discharge channel under a high-pressure environment, the condition that water splashing cannot occur when the brewing cavity descends and the brewing head is separated is ensured, and the internal environment of the coffee machine is ensured to be dry and tidy.

However, the existing pressure relief drain valve still has certain defects, when the brewing device begins to brew, front-end waste water exists in a water supply pipeline in the boiler, so that the temperature can not reach the expectations, and bubbles are easy to exist, thereby influencing the brewing effect. It is therefore highly necessary to be able to simultaneously realize the discharge of the high-temperature waste water after brewing and the discharge of the front-end waste water before brewing.

Disclosure of Invention

The utility model solves the problem of overcoming at least one defect in the prior art, and provides a pressure relief drain valve and a coffee machine, which can realize the advanced pressure relief and waste water drainage of a brewing device, so that hot water splashing can not occur when a brewing cavity in the coffee machine descends and is separated from a brewing head, and meanwhile, the waste water at the front end in a boiler can be drained, and the brewing effect is improved.

In order to solve the problems, the utility model provides a pressure relief drain valve which is applied to a coffee machine and comprises a valve body and a valve core, wherein the upper end of the valve core is axially slidably assembled in a valve cavity of the valve body, the valve core is in sealing fit with the lower end of an inner cavity of the valve body when sliding, a first waste discharge channel, a water inlet channel, a water supply channel and a second waste discharge channel which are arranged from top to bottom and are communicated with the valve cavity are respectively arranged on the outer wall of the valve body, and a first sealing part, a second sealing part and a third sealing part are respectively arranged between the first waste discharge channel and the water inlet channel, between the water inlet channel and the water supply channel and between the water supply channel and the second waste discharge channel in the valve cavity; the other end of the valve core is connected with a valve core cap, and an elastic element is arranged between the valve core cap and the end part of the valve body, so that the valve core always has a trend of moving towards one end far away from the valve cavity; in an initial state, the first sealing part and the second sealing part are closed, the third sealing part is opened, and when the valve core is moved upwards to a first position when one end of the valve core, which is close to the valve core cap, is subjected to axial acting force, the first sealing part is opened, the second sealing part and the third sealing part are closed, and front-end waste water in the boiler of the coffee machine is discharged from the water inlet channel through the first waste discharge channel; when the valve core continues to move upwards to a second position under the axial acting force, the first sealing part and the third sealing part are closed, the second sealing part is opened, and hot water in the coffee machine boiler enters the brewing cavity from the water outlet channel through the water supply channel; when the axial acting force acting on the valve core disappears, the valve core moves downwards to an initial position under the reset action of the elastic element, and the waste water in the brewing cavity can be discharged through the second waste discharge channel under the high-pressure environment.

Compared with the prior art, the pressure relief drain valve has the following advantages:

the pressure relief drain valve structure of the utility model enables four channels to be formed in the valve body through improvement of the valve body, and the four channels are respectively used for being connected with a first waste water box in a coffee machine, a boiler water outlet end of the coffee machine, supplying water for a brewing device and a second waste water box in a brewing device head; the flexible switching of the first waste discharge state, the water supply state and the second waste discharge state is realized through the position switching of the valve core in the valve cavity; more importantly, in the structure, the pre-positioning of the valve core position is realized at one end part of the valve body through arranging the corresponding elastic element, so that hot water at the boiler end cannot enter the valve cavity in the initial state, and the safety performance is ensured; when water is needed to be fed in the brewing device, front-end waste water in the boiler does not directly enter the brewing cavity, but is firstly discharged into a corresponding waste water box through the first waste discharge channel, so that the influence of the front-end waste water on the brewing effect is avoided, and the taste of coffee is further influenced; when the front-end waste water in the boiler is discharged, the subsequent normal hot water begins to formally enter the brewing cavity to realize brewing; after brewing is finished, the waste water in the brewing cavity and the residual hot water in the brewing head can be discharged through the liquid discharge channel in a high-pressure environment, so that pressure relief and waste discharge are realized, the condition that water splashes when the brewing cavity descends and the brewing head is separated is avoided, and the internal environment of the coffee machine is ensured to be dry and tidy; the three states can be switched by only providing corresponding axial acting force for the valve core through corresponding structures in the coffee machine, so that the valve core overcomes the elastic force of the elastic element, and the coffee machine is very convenient.

As an improvement, a first sealing element, a second sealing element and a third sealing element are respectively arranged on the inner walls of the valve cavity between the first waste discharge channel and the water inlet channel, between the water inlet channel and the water supply channel and between the water supply channel and the waste discharge channel; the valve core is located at one end in the valve cavity and comprises a first valve core corresponding to the first sealing element, a second valve core corresponding to the second sealing element and a third valve core corresponding to the third sealing element, a first connecting rod and a second connecting rod are respectively arranged between the first valve core and the second valve core and between the second valve core and the third valve core, the diameter of the first connecting rod is smaller than the inner hole of the first sealing element, and the inner diameter of the second connecting rod is smaller than the inner holes of the second sealing element and the third sealing element. In the improved structure, the valve core is divided into a three-section structure, so that the valve core is in sealing fit with three sealing elements, and the sealing states of the three sealing parts are flexibly switched through lifting movement of the valve core.

The improved valve body comprises a first valve body, a second valve body and a third valve body which are sequentially connected in a shaft way from top to bottom, wherein the first waste discharge channel is arranged on the first valve body, the water inlet channel and the water supply channel are arranged on the second valve body, and the second waste discharge channel is arranged on the third valve body; the first sealing piece is arranged in the second valve body and is positioned above the water inlet channel, the second sealing piece is arranged in the second valve body and is positioned between the water inlet channel and the water supply channel, and the third sealing piece is arranged in the second valve body and is positioned below the water supply channel. In the improved structure, the valve body is arranged into a split structure, and the first sealing element, the second sealing element and the third sealing element are effectively installed and replaced through the corresponding annular boss structure, so that the axial stability after installation is ensured.

The improved valve is characterized in that an end cover is assembled at the lower end of the third valve body, the upper end of the end cover is inserted and assembled in the inner cavity of the third valve body, a third limiting step is arranged in the inner cavity of the third valve body below the second waste discharge channel, a fourth sealing piece is arranged between the upper end of the end cover and the third limiting step, and the lower end of the valve core is slidably arranged in the end cover and the fourth sealing piece in a penetrating mode. Among the above-mentioned improvement structure, through the setting of end cover structure and third spacing step, realized the quick installation of fourth sealing member and stable spacing, effectively realized the sealing performance of third valve body inner chamber.

Preferably, the elastic element is a spring sleeved outside the valve core, and the upper end and the lower end of the spring are respectively abutted against the valve body and the valve core cap. In the structure, the spring is selected as the elastic element, so that the structure is simple, the elastic reset is stable, and the installation is convenient.

Still improved, the case is kept away from be provided with spacing draw-in groove on the outer wall of valve body one end, the one end of case cap is equipped with and is used for confession the tip cartridge's of case cartridge insertion hole, just be equipped with on the inner wall of cartridge hole open end with spacing draw-in groove complex spacing card is protruding. The improved structure realizes the quick installation of the valve core and the valve core cap in a matching mode of the clamping convex part and the clamping groove, and is axially limited and stable.

In addition, the utility model also provides a coffee machine, which comprises a brewing device and a driving gear, wherein a vertically slidable brewing cavity is arranged in the brewing device, the driving gear is used for driving the brewing cavity to slide up and down, the coffee machine further comprises a pressure relief drain valve with any structure, the pressure relief drain valve is connected with a coffee machine shell, a water supply channel is communicated to the brewing cavity, and a first driving part and a second driving part which are used for respectively driving the valve core to move to a first position and a second position towards the valve cavity are arranged on the driving gear so as to respectively realize the discharge of front-end waste water in the boiler and the entry of hot water into the brewing cavity through the water supply channel.

The improved valve comprises a valve core, a valve body, a valve core and a driving gear, wherein the valve core is arranged on the valve body, the valve body is provided with a valve core, and the valve core is connected with a valve body; when the driving gear rotates to the position that the first outer convex top block is abutted against the driving block, front-end waste water in the boiler is discharged from the water outlet channel through the first waste discharge channel, and when the driving gear continues to rotate to the position that the second outer convex top block is abutted against the driving block, hot water in the boiler normally enters the brewing cavity; when the driving gear reversely resets to the initial position, the driving block loses abutment, and the elastic element is used for driving the valve core to reset to the initial position.

Drawings

FIG. 1 is a schematic diagram of a pressure relief drain valve according to the present utility model;

FIG. 2 is a schematic view showing a semi-sectional structure of the pressure relief drain valve of the present utility model in an initial state (second waste discharge state);

FIG. 3 is a schematic view of a semi-sectional structure of the pressure relief drain valve of the present utility model in a first drainage state;

FIG. 4 is a schematic view showing a semi-sectional structure of the pressure relief drain valve of the present utility model in a water supply state;

FIG. 5 is an enlarged schematic view of the structure of the portion X in FIG. 2;

FIG. 6 is a schematic view of a partial structure of the coffee maker of the present utility model;

fig. 7 is a schematic diagram of an assembling structure of a driving gear and a valve body in the present utility model.

Reference numerals illustrate:

1. a valve body; 1.1, a first valve body; 1.2, a second valve body; 1.3, a third valve body; 2. a valve core; 2.1, a first valve core; 2.2, a second valve core; 2.3, a third valve core; 2.4, limiting clamping grooves; 3. a water inlet channel; 4. a water supply channel; 5. a second waste discharge channel; 6. a valve core cap; 6.1, limiting clamp protrusions; 7. an elastic element; 8. a first seal; 9. a second seal; 10. a third seal; 11. a plug-in hole; 12. a water inlet joint; 13. a water supply joint; 14. a first waste discharge joint; 15. an end cap; 16. a drive gear; 17. a brewing chamber; 18. the first outer convex top block; 19. a driving block; 20. a brewing head; 21. a water inlet cannula; 23. a first waste discharge channel; 24. a fourth seal; 25. a first link; 26. a second link; 27. a first limit step; 28. a bushing; 29. a second limit step; 30. a third limit step; 32. a second waste discharge joint; 33. a second outer convex top block; 34. a first cartridge shaft; 35. and a second cartridge shaft.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

In the description of the present utility model, it should be noted that the azimuth or positional relationship indicated by the terms "upper end", "lower end", "outside", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and defined otherwise, the term "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1 and 2, the utility model provides a pressure relief drain valve, which is applied to a coffee machine and comprises a cylindrical valve body 1 and a rod-shaped valve core 2, wherein the interior of the valve body 1 is a hollow valve cavity, a corresponding sealing part is arranged in the valve cavity, the upper end of the valve core 2 is slidably assembled in the valve cavity of the valve body 1 along the axial direction, and the valve core 2 is matched with the sealing part or separated from the sealing part to realize the on-off between an inlet and an outlet of the valve cavity. Specifically, a first waste discharge channel 23, a water inlet channel 3, a water supply channel 4 and a second waste discharge channel 5 which are arranged from top to bottom and are communicated with a valve cavity are respectively arranged on the outer wall of the valve body 1, and a first sealing part, a second sealing part and a third sealing part are respectively arranged between the first waste discharge channel and the water inlet channel, between the water inlet channel 3 and the water supply channel 4 and between the water supply channel 4 and the waste discharge channel 5 in the valve cavity; wherein the water inlet channel 3 is adapted to communicate with a water boiler in the coffee machine and the water supply channel 4 is adapted to communicate with a brew chamber 17 in the coffee machine. More specifically, the outer wall of the brewing device is also provided with a corresponding brewing head 20, and the water supply channel 4 is communicated with the brewing cavity 17 through the brewing head 20; the first waste discharge channel 23 is used for discharging front-end waste water in the boiler to a waste water box, and the second waste discharge channel 5 is used for discharging waste water in the brewing pipe to a waste water box in the coffee machine.

As shown in fig. 2, the lower end of the valve core 2 is connected with a valve core cap 6, and an elastic element 7 is arranged between the valve core cap 6 and the end of the valve body 1, so that the valve core 2 always has a tendency to move towards the end far away from the valve cavity; in the initial state, the first sealing part is closed, the second sealing part is closed, the third sealing part is opened, namely the water inlet channel 3 is closed with the first waste discharge channel 23, the water inlet channel 3 is closed with the water supply channel, and the water supply channel 4 is communicated with the second waste discharge channel 5; when one end of the valve core 2 near the valve core cap 6 receives axial acting force, the valve core 2 moves upwards to a first position, at the moment, the first sealing part is opened, the second sealing part and the third sealing part are closed, namely the water inlet channel 3 is communicated with the first waste discharge channel 23, the water inlet channel 3 is closed with the water supply channel 4, and front-end waste water in the coffee machine boiler can only be discharged through the first waste discharge channel 23 after flowing out from the water inlet channel 3; when the valve core 2 continues to move upwards to the second position under the axial acting force, the first sealing part and the third sealing part are closed, and the second sealing part is opened, namely the water inlet channel 3 is communicated with the water supply channel and is closed with the first waste discharge channel 23, so that hot water in the boiler can enter the brewing cavity 17 through the water supply channel 4; after the axial force acting on the valve core 2 is removed, the valve core 2 moves down to the initial position under the reset action of the elastic element 7, so that the waste water in the brewing chamber 17 and the residual hot water in the brewing head 20 can be discharged through the second waste discharge channel 5 under high pressure environment.

In the above structure, the valve core cap 6 is detachably connected with the valve core 2, specifically, as shown in fig. 2, a limit clamping groove 2.4 is arranged on the outer wall of one end of the valve core 2 far away from the valve body 1, one end of the valve core cap 6 is provided with an insertion hole 11 for inserting the end part of the valve core 2, and the inner wall of the opening end of the insertion hole 11 is provided with a limit clamping protrusion 6.1 matched with the limit clamping groove 2.4; when one end of the valve core 2 is inserted into the insertion hole 11 to a set position, the limit clamping protrusion 6.1 and the limit clamping groove 2.4 are assembled and positioned, so that the valve core cap 6 and the valve core 2 are assembled quickly.

More specifically, in this embodiment, a first sealing member 8, a second sealing member 9 and a third sealing member 10 are respectively disposed on the inner walls of the valve cavity between the first waste discharge passage 23 and the water inlet passage 3, between the water inlet passage 3 and the water supply passage 4, and between the water supply passage 4 and the waste discharge passage 5; in addition, the end of the valve core 2 positioned in the valve cavity comprises a first valve core 2.1 corresponding to the first sealing piece 8, a second valve core 2.2 corresponding to the second sealing piece 9 and a third valve core 2.3 corresponding to the third sealing piece 10; and a first connecting rod 25 and a second connecting rod 26 are respectively arranged between the first valve core 2.1 and the second valve core 2.2 and between the second valve core 2.2 and the third valve core 2.3, the diameter of the first connecting rod 25 is smaller than the inner hole of the first sealing element 8, and the inner diameter of the second connecting rod 26 is smaller than the inner holes of the second sealing element 9 and the third sealing element 10.

In the structure, the inner space of the valve cavity is divided into four chambers by the three sealing pieces, and the on-off of the chambers is realized by sliding the valve core 2 in the corresponding sealing pieces; and the three sealing pieces are annular sealing gaskets, and the middle parts of the sealing gaskets are provided with communication holes for the valve core 2 to slide and pass through for matching.

As shown in fig. 2, in the initial state, the first valve rod 2.1 is in sealing fit in the first sealing member 8, the water inlet channel 3 is not communicated with the water supply channel 4, the second valve rod 2.2 is in sealing fit in the second sealing member 9, the water inlet channel 3 is not communicated with the water supply channel 4, the second connecting rod 26 is positioned in the third sealing member 10, and a gap is reserved between the second connecting rod 26 and the inner wall of the third sealing member 10, namely, the water supply channel 4 is communicated with the second waste discharge channel 5.

As shown in fig. 3, in the first working position, the lower end of the valve core 2 is raised to the first position after receiving an upward axial force, at this time, the valve core 2 moves upward until the second valve core 2.2 is in sealing engagement with the second sealing member 9, and the first connecting rod 25 slides into the first sealing member 8, and the diameter of the first connecting rod 25 is smaller than the inner diameter of the first sealing member 8, so that a gap exists between the two, at this time, the water inlet channel 3 is closed with the water supply channel 4 and is communicated with the first waste discharge channel 23, so that hot water of the boiler does not enter the water supply channel 4 after coming out from the water inlet channel 3, but is discharged from the first waste discharge channel 23 into the set waste water box.

As shown in fig. 4, in the second working position, the lower end of the valve core 2 continues to be subjected to an axially upward acting force and then rises to the second position, at this time, the second valve core 2.2 is in sealing engagement with the first sealing element 8, the third valve core 2.3 is in sealing engagement with the third sealing element 10, the second connecting rod 26 slides into the second sealing element 9, and a gap exists between the second connecting rod 26 and the second sealing element 9, so that at this time, hot water in the boiler can only enter the brewing cavity 17 along the water supply channel 4 to brew from the water inlet channel 3; after the brewing is completed, after the axial acting force acting on the valve core 2 disappears, the valve core 2 is reset to the initial position under the action of the elastic element 7, namely the position shown in fig. 2, at this time, residual waste water in the brewing chamber 17 and residual hot water in the brewing head 20 can be discharged into a waste liquid box (not shown in the figure) along the second waste discharge channel 5 under the pressure action of the brewing chamber 17, so that the pressure relief and drainage effects of the coffee machine are realized.

Preferably, as shown in fig. 1 and 2, the valve body 1 comprises a first valve body 1.1, a second valve body 1.2 and a third valve body 1.3 which are axially connected together in sequence from top to bottom; the first waste discharge channel 23 is arranged on the first valve body 1.1, the water inlet channel 3 and the water supply channel 4 are arranged on the second valve body 1.2, and the second waste discharge channel 5 is arranged on the third valve body 1.3; and the first sealing member 8 is arranged in the second valve body 1.2 and is positioned above the water inlet channel 3, the second sealing member 9 is arranged in the second valve body 1.2 and is positioned between the water inlet channel 3 and the water supply channel 4, and the third sealing member 10 is arranged in the second valve body 1.2 and is positioned below the water supply channel 4.

More specifically, a first plug-in shaft 34 is formed at the lower end of the first valve body 1.1, the first plug-in shaft 34 is in plug-in fit with the upper end of the inner cavity of the second valve body 1.2, and a sealing ring is arranged between the outer wall of the first plug-in shaft 34 and the inner wall of the cavity of the second valve body 1.2; a first limiting step 27 is arranged in the cavity of the second valve body 1.2 at a position between the water inlet channel 3 and the water supply channel 4, the second sealing element 9 is assembled on the first limiting step 27, a bushing 28 is arranged at the upper end of the second sealing element 9, the bushing 28 corresponds to the position of the water inlet channel 3, a liquid inlet through hole is formed in the outer wall of the bushing 28 along the circumferential direction, and the first sealing element 8 is arranged between the upper end of the bushing 28 and the lower end face of the first inserting shaft 34; a second limiting step 29 is arranged in the cavity of the second valve body 1.2 at a position below the water supply channel 4, a second plug-in shaft 35 which is in plug-in fit with the lower end of the second valve body 1.2 is arranged at the upper end of the third valve body 1.3, and a third sealing element 10 is arranged between the second limiting step 29 and the upper end face of the second plug-in shaft 35.

As shown in fig. 2, an end cover 15 is assembled at the lower end of the third valve body 1.3, the upper end of the end cover 15 is inserted and assembled in the inner cavity of the third valve body 1.3, a third limit step 30 is arranged below the second waste discharge channel 5 in the inner cavity of the third valve body 1.3, and a fourth sealing element 24 is arranged between the upper end of the end cover 15 and the third limit step 30, so that the axial limit of the fourth sealing element 24 is realized; the lower end of the valve core 2 is arranged in the end cover 15 and the fourth sealing piece 24 in a sliding penetrating way, and the structure ensures that the fourth sealing piece 24 is installed and positioned more square; and meanwhile, the sealing isolation between the inner cavity of the third valve body 1.3 and the external environment is realized.

On the other hand, a first waste discharging joint 14 communicated with the first waste discharging channel 23 is integrally formed directly at the upper end of the first valve body 1.1 along the horizontal direction; a water inlet joint 12 and a water supply joint 13 which are respectively communicated with the water inlet channel 3 and the water supply channel 4 and are horizontally arranged are formed on the side wall of the second valve body 1.2; the water supply connector 13 is inserted and assembled with the upper end connector of the brewing head 20; in addition, a second waste discharge joint 32 communicating with the second waste discharge passage 5 is formed on the side wall of the third valve body 1.3.

In this embodiment, as shown in fig. 2 and 5, the elastic element 7 is a spring, the spring is sleeved outside the valve core 2, and two ends of the spring respectively abut against the lower end of the end cover 15 and the upper end face of the valve core cap 6, so as to ensure the stability of the elastic reset performance. More specifically, a positioning convex column is further formed at the lower end of the end cover 15, and the upper end of the spring is sleeved and limited at the outer part of the positioning convex column. In other embodiments, the elastic element 7 may also be a rubber bellows or an elastic cylinder.

On the other hand, as shown in fig. 6 and 7, the utility model also provides a coffee machine, which comprises a brewing device and a driving gear 16, wherein a brewing cavity 17 which can slide vertically is arranged in the brewing device, the driving gear 16 is used for driving the brewing cavity 17 to slide up and down, in addition, as shown in fig. 2, a water inlet insertion pipe 21 which is communicated with the inner cavity of the brewing cavity 17 is arranged on the side wall of the brewing cavity 17, a brewing head 20 is connected on the outer wall of the brewing cavity 17, and the coffee machine further comprises the pressure-relief drainage valve, wherein the pressure-relief drainage valve is connected with a coffee machine shell, the inlet of the brewing head 20 is communicated with a water supply channel 4 of the pressure-relief drainage valve, and the outlet of the brewing head 20 is detachably inserted with the water inlet insertion pipe 21; i.e. when the upper brewing chamber 17 moves up to the highest point, the water inlet cannula 21 is inserted and assembled with the outlet at the lower end of the brewing head 20; in addition, a first driving part and a second driving part are arranged on the driving gear 16 and are used for respectively driving the valve core 2 to move to a first position and a second position towards the valve cavity so as to realize on-off among a plurality of channels in the valve body 1.

More specifically, the driving part in this embodiment refers to a first outer convex top block 18 and a second outer convex top block 33 formed on the driving gear 16 and eccentrically arranged with the center of the driving gear 16, and the lower end of the valve core 2 is connected with a driving block 19; specifically, in this structure, the driving block 19 is detachably connected with the valve core cap 6, that is, a horizontally arranged chute is provided at the upper end of the driving block 19, and the flange at the lower end of the valve core cap 6 is slidably fitted in the corresponding chute. When the driving gear 16 rotates to drive the brewing cavity 17 to be positioned at the brewing station, the outer end surface of the first outer convex ejector block 18 is abutted against the driving block 19 so as to realize that the valve core 2 moves upwards to a first waste discharge station and realize the discharge of waste water at the front end of the boiler; the driving gear 16 continues to rotate a certain angle until the second outer convex top block 33 is abutted against the driving block 19, and the valve core 2 moves upwards to a water supply station at the moment, so that brewing in the brewing cavity 17 is realized; when the driving gear 16 reversely resets to the initial position, the first outer convex top block 18 is separated from the driving block 19, the valve core 2 resets downwards to the second waste water discharge station under the reset action of the spring, waste water in the brewing cavity 17, the brewing head 20 and residual hot water in the water supply channel 4 enter into a waste liquid collection box arranged in the coffee machine along the second waste water discharge channel 5 under the residual pressure action of the brewing cavity 17, so that the coffee machine is very convenient and the environment in the coffee machine is effectively ensured to be clean; after coffee brewing is finished, the driving gear 16 is reset reversely, so long as the driving gear 16 rotates by a small angle, the first outer convex top block 18 is separated from the driving block 19 under the condition that the position of the brewing cavity 17 is basically unchanged, the pressure release and drainage function is realized through the reset of the spring, and the condition that waste water splashes due to pressure at the joint when the brewing chamber is separated from the brewing head 20 is avoided, so that the internal environment of the coffee machine is influenced.

Although the present disclosure is described above, the scope of protection of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the utility model.

Claims (8)

1. The utility model provides a pressure release drain valve, is applied to coffee machine, includes valve body (1) and case (2), the upper end of case (2) is along the slidable dress of axial in the valve pocket of valve body (1), just case (2) when sliding with the lower extreme sealing fit of valve body (1) inner chamber, its characterized in that: a first waste discharge channel (23), a water inlet channel (3), a water supply channel (4) and a second waste discharge channel (5) which are arranged from top to bottom and are communicated with the valve cavity are respectively arranged on the outer wall of the valve body (1), and a first sealing part, a second sealing part and a third sealing part are respectively arranged in the valve cavity between the first waste discharge channel (23) and the water inlet channel (3), between the water inlet channel (3) and the water supply channel (4), and between the water supply channel (4) and the second waste discharge channel (5); the other end of the valve core (2) is connected with a valve core cap (6), and an elastic element (7) is arranged between the valve core cap (6) and the end part of the valve body (1), so that the valve core (2) always has a trend of moving towards one end far away from the valve cavity; in an initial state, the first sealing part and the second sealing part are closed, the third sealing part is opened, and when the valve core (2) is moved upwards to a first position when one end of the valve core (2) close to the valve core cap (6) is subjected to axial acting force, the first sealing part is opened, the second sealing part and the third sealing part are closed, and front-end waste water in a boiler of the coffee machine is discharged from a water inlet channel through a first waste discharge channel (23); when the valve core (2) continues to be moved upwards to a second position by axial acting force, the first sealing part and the third sealing part are closed, the second sealing part is opened, and hot water in the coffee machine boiler enters the brewing cavity (17) from the water inlet channel (3) through the water supply channel (4); when the axial acting force acting on the valve core (2) disappears, the valve core (2) moves downwards to an initial position under the reset action of the elastic element (7), and the waste water in the brewing cavity (17) can be discharged through the second waste discharge channel (5) under the high-pressure environment.

2. The pressure relief drain valve of claim 1, wherein: a first sealing element (8), a second sealing element (9) and a third sealing element (10) are respectively arranged on the inner walls of the valve cavity between the first waste discharge channel (23) and the water inlet channel (3), between the water inlet channel (3) and the water supply channel (4) and between the water supply channel (4) and the waste discharge channel (5); one end of the valve core (2) located in the valve cavity comprises a first valve core (2.1) corresponding to a first sealing element (8), a second valve core (2.2) corresponding to a second sealing element (9) and a third valve core (2.3) corresponding to a third sealing element (10), a first connecting rod (25) and a second connecting rod (26) are respectively arranged between the first valve core (2.1) and the second valve core (2.2) and between the second valve core (2.2) and the third valve core (2.3), the diameter of the first connecting rod (25) is smaller than the inner holes of the first sealing element (8), and the inner diameter of the second connecting rod (26) is smaller than the inner holes of the second sealing element (9) and the third sealing element (10).

3. The pressure relief drain valve of claim 2, wherein: the valve body (1) comprises a first valve body (1.1), a second valve body (1.2) and a third valve body (1.3) which are sequentially connected in a shaft way from top to bottom, the first waste discharge channel (23) is arranged on the first valve body (1.1), the water inlet channel (3) and the water supply channel (4) are arranged on the second valve body (1.2), and the second waste discharge channel (5) is arranged on the third valve body (1.3); the first sealing element (8) is arranged in the second valve body (1.2) and is located above the water inlet channel (3), the second sealing element (9) is arranged in the second valve body (1.2) and is located between the water inlet channel (3) and the water supply channel (4), and the third sealing element (10) is arranged in the second valve body (1.2) and is located below the water supply channel (4).

4. A pressure relief drain valve as defined in claim 3, wherein: the end cover (15) is assembled at the lower extreme of third valve body (1.3), the upper end of end cover (15) is inserted and is fit in the inner chamber of third valve body (1.3), just be located in the inner chamber of third valve body (1.3) second waste discharge passageway (5) below is provided with third spacing step (30), the upper end of end cover (15) with be provided with fourth sealing member (24) between third spacing step (30), the lower extreme of case (2) slides and wears to establish in end cover (15) and fourth sealing member (24).

5. The pressure relief drain valve as defined in claim 4, wherein: the elastic element (7) is a spring sleeved outside the valve core (2), and the upper end and the lower end of the spring are respectively abutted against the valve body (1) and the valve core cap (6).

6. The pressure relief drain valve of claim 1, wherein: the valve core is characterized in that a limiting clamping groove (2.4) is formed in the outer wall of the lower end of the valve core (2), an inserting hole (11) for inserting the end part of the valve core (2) is formed in the upper end of the valve core cap (6), and a limiting clamping protrusion (6.1) matched with the limiting clamping groove is formed in the inner wall of the opening end of the inserting hole (11).

7. The utility model provides a coffee machine, includes brewing ware and drive gear (16), be provided with in the brewing ware along vertically slidable brewing chamber (17), drive gear (16) are used for driving brewing chamber (17) slide from top to bottom, its characterized in that: the pressure relief drain valve according to any one of claims 1 to 6 is connected with a coffee machine shell, the water supply channel (4) is communicated to the brewing cavity (17), and the driving gear (16) is provided with a first driving part and a second driving part for driving the valve core (2) to move to a first position and a second position towards the valve cavity respectively, so that front-end waste water in the boiler is discharged and hot water enters the brewing cavity (17) through the water supply channel (4) respectively.

8. The coffee machine of claim 7, wherein: a first outer convex top block (18) and a second outer convex top block (33) which are eccentric and distributed circumferentially are arranged on the driving gear (16), and the lower end of the valve core (2) is connected with a driving block (19); when the driving gear (16) rotates to the state that the first outer convex top block (18) is abutted against the driving block (19), front-end waste water in the boiler is discharged from the water inlet channel (3) through the first waste discharge channel (23), and when the driving gear (16) continues to rotate to the state that the second outer convex top block (33) is abutted against the driving block (19), hot water in the boiler normally enters the brewing cavity (17); when the driving gear (16) is reversely reset to the initial position, the driving block (19) loses abutment, and the elastic element (7) is used for driving the valve core (2) to be reset to the initial position.