Valve rod of coffee machine brewing head and coffee machine brewing head

Abstract

The utility model discloses a valve rod of a brewing head of a coffee machine. A ball (512) which can be pushed by a cam (4) and can roll relative to a rod body (511) is arranged on the rod body (511) and close to one end of the cam (4) of the brewing head of the coffee machine. The utility model further discloses a coffee machine brewing head which comprises a seat body (1), a water inlet valve element assembly (2), a presoaking valve element assembly (3), a cam (4) and a handle (6) are arranged in the seat body (1), the water inlet valve element assembly (2) and the presoaking valve element assembly (3) respectively comprise a valve rod (51), each valve rod (51) comprises a rod body (511), and a ball (512) which can be pushed by the cam (4) and can roll relative to the rod body (511) is arranged at the end, close to the cam (4), of the rod body (511). The valve rods (51) are sleeved with second reset springs (52) capable of pushing the valve rods (51) to reset.

Description

Technical Field

[0001] The utility model relates to a valve rod of a coffee machine brewing head. The utility model also relates to a coffee machine brewing head.

Background Art

[0002] A coffee machine is a machine for brewing coffee, and a coffee machine brewing head is an important component of the coffee machine. At present, some coffee machines on the market adopt an E61 brewing head, and its working principle is as follows: when the handle is pulled upward, the cam connected to the handle pushes the valve rod of the water inlet valve core upward, and the water inlet valve opens. At this time, the pre-infusion valve and the pressure relief valve are closed. When hot water is injected into each open pipeline and cavity of the brewing head, the pressure rises. When the hot water pressure in the waterway exceeds a certain pressure, the pre-infusion valve opens, and the hot water pre-soaks the coffee cake. The hot water pressure starts to rise again until it reaches 8-10 atmospheres. After the coffee is made, the handle is pulled downward, the cam connected to the handle pushes the valve rod of the pre-infusion valve core downward, the pre-infusion valve and the pressure relief valve open, and at this time the water inlet valve closes, and part of the pressurized hot water is discharged from the drain port. The E61 brewing head has the advantages of "good heat preservation, slow pressure build-up, pre-soaking, and being beneficial to uniform coffee extraction", and is still widely used by manufacturers at present.

[0003] However, the ends of the valve rods of the water inlet valve core and the pre-infusion valve core of this brewing head are in direct contact with the cam. When the cam rotates, it directly pushes the end of the valve rod. After long-term use, the end of the valve rod or the surface of the cam will be worn, resulting in the abnormal operation of the water inlet valve and the pre-infusion valve. Therefore, the E61 brewing head on the market generally needs to be repaired and replaced with accessories after about 2000 uses, which increases the use cost.

[0004] Therefore, the present utility model is precisely produced based on the above deficiencies.

Content of the Utility Model

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a valve rod of a coffee machine brewing head with a simple structure and capable of extending the service life. The utility model also provides a coffee machine brewing head adopting the aforementioned valve rod, which can extend the service life of the valve rod or the cam and reduce the use cost.

[0006] The present utility model is realized through the following technical solutions:

[0007] A valve rod of a coffee machine brewing head includes a rod body, and a ball capable of being pushed by a cam and rolling relative to the rod body is provided at one end of the rod body close to the cam of the coffee machine brewing head.

[0008] A sunken groove is provided at the end of the rod body, the ball is arranged in the sunken groove, a cover for blocking the notch of the sunken groove is connected to the rod body, and a through hole for part of the ball to protrude is provided in the center of the cover.

[0009] A first return spring capable of pushing the ball to reset is provided in the sinking groove.

[0010] 1. A coffee machine brewing head, comprising a seat body, an inlet water valve core assembly, a pre-infusion valve core assembly, a cam and a handle are provided in the seat body. Both the inlet water valve core assembly and the pre-infusion valve core assembly include valve stems. The valve stem includes a rod body. A ball that can be pushed by the cam and can roll relative to the rod body is provided at one end of the rod body close to the cam. A second return spring capable of pushing the valve stem to reset is sleeved on each valve stem. An inwardly concave sinking groove is provided at the end of the rod body. The ball is arranged in the sinking groove. A cover for blocking the notch of the sinking groove is connected to the rod body. A through hole for part of the ball to protrude is provided in the center of the cover. A first return spring capable of pushing the ball to reset is provided in the sinking groove. A pressure relief valve is further provided in the seat body and located below the pre-infusion valve core assembly.

[0011] Compared with the prior art, the present utility model has the following advantages:

[0012] 1. A ball that can roll relative to it is provided at the end of the rod body of the valve stem of the coffee machine brewing head of the present utility model. Therefore, when the cam rotates and pushes the inlet water valve core assembly or the pre-infusion valve core assembly to move, the outer surface of the cam touches the ball and pushes the ball, thereby enabling the inlet water valve core assembly or the pre-infusion valve core assembly to move. It can reduce the friction between the cam and the valve stem, thereby extending the service life of the valve stem and ensuring the normal operation of the inlet water valve core assembly and the pre-infusion valve core assembly.

[0013] 2. The ball of the present utility model is assembled in the sinking groove on the rod body through the cover, and a through hole for part of the ball to protrude is provided in the center of the cover, thereby ensuring that the ball can not only have a rolling fit with the cam but also ensure the reliable installation of the ball.

[0014] 3. When the cam rotates, it touches the ball and pushes the ball. During this process, the first return spring is compressed and can also play a buffering role, thereby reducing the wear of the valve stem or the cam and extending the service life of the valve stem or the cam.

Description of the Drawings

[0015] Figure 1 is a cross-sectional view of a prior art valve stem;

[0016] Figure 2 is a cross-sectional view of the valve stem of the coffee machine brewing head of the present utility model;

[0017] Figure 3 is a three-dimensional view of the valve stem of the coffee machine brewing head of the present utility model;

[0018] Figure 4 is a three-dimensional view of the coffee machine brewing head of the present utility model;

[0019] Figure 5 is an exploded view of the brewing head of the coffee machine of the present utility model;

[0020] Figure 6 is an exploded view of the components of the brewing head of the coffee machine of the present utility model;

[0021] Figure 7 is a cross-sectional view of the brewing head of the coffee machine of the present utility model;

[0022] Figure 8 is Figure 7 an enlarged view of the position A in

Detailed implementation manners

[0023] The present utility model will be further described below in conjunction with the accompanying drawings:

[0024] As Figures 2 to 7 shown, a valve rod of a brewing head of a coffee machine includes a rod body 511. A ball 512 that can be pushed by a cam 4 and can roll relative to the rod body 511 is provided at one end of the rod body 511 close to the cam 4 of the brewing head of the coffee machine. When the cam 4 rotates and pushes the water inlet valve core assembly 2 or the pre-infusion valve core assembly 3 to move, the outer surface of the cam 4 touches the ball 512 and pushes the ball 512, thereby causing the water inlet valve core assembly 2 or the pre-infusion valve core assembly 3 to move. Through the contact and cooperation between the ball 512 and the outer surface of the cam 4, the friction between the cam 4 and the valve rod 51 can be reduced, thereby extending the service life of the valve rod 51 and ensuring the normal operation of the water inlet valve core assembly 2 and the pre-infusion valve core assembly 3, and ensuring the reliability of the brewing head of the coffee machine.

[0025] As Figure 2 shown, a sunken groove 513 is provided at the end of the rod body 511. The ball 512 is arranged in the sunken groove 513. A cover 514 for blocking the notch of the sunken groove 513 is connected to the rod body 511. A through hole 515 for part of the ball 512 to protrude is provided in the center of the cover 514. The ball 512 is assembled in the sunken groove 513 on the rod body 511 through the cover 514 for blocking. Moreover, a through hole 515 for part of the ball 512 to protrude is provided in the center of the cover 514, thereby ensuring that the ball 512 can both perform rolling cooperation with the cam 4 and ensure the reliable installation of the ball 512. The cover 514 and the rod body 511 can be connected by threads or other connection methods.

[0026] As Figure 2 shown, a first return spring 516 capable of pushing the ball 512 to reset is provided in the sunken groove 513. When the cam 4 rotates and touches the ball 512 and pushes the ball 512, the first return spring 516 is compressed during this process, and it can also play a buffering role, thereby reducing the wear of the valve rod 51 or the cam 4 and extending the service life of the valve rod 51 or the cam 4.

[0027] As shown Figures 2 to 7 in the figure, a coffee machine brewing head includes a seat body 1. An inlet water valve core assembly 2, a pre-infusion valve core assembly 3, a cam 4 and a handle 6 are arranged in the seat body 1. Both the inlet water valve core assembly 2 and the pre-infusion valve core assembly 3 include a valve rod 51. The valve rod 51 includes a rod body 511. A ball 512 that can be pushed by the cam 4 and can roll relative to the rod body 511 is arranged at one end of the rod body 511 close to the cam 4. A second return spring 52 that can push the valve rod 51 to reset is sleeved on each of the valve rods 51. A pressure relief valve 7 is further arranged in the seat body 1 and at the lower end of the pre-infusion valve core assembly 3. A sunken groove 513 is arranged at the end of the rod body 511 inwards. The ball 512 is arranged in the sunken groove 513. A cover 514 that seals the notch of the sunken groove 513 is connected to the rod body 511. A through hole 515 for part of the ball 512 to protrude is arranged in the center of the cover 514. A first return spring 516 that can push the ball 512 to reset is arranged in the sunken groove 513. When the cam 4 rotates and pushes the inlet water valve core assembly 2 or the pre-infusion valve core assembly 3 to move, the outer surface of the cam 4 touches the ball 512 and pushes the ball 512, thereby making the inlet water valve core assembly 2 or the pre-infusion valve core assembly 3 move, which can reduce the friction between the cam 4 and the valve rod 51, thus prolonging the service life of the valve rod 51 or the cam 4 and ensuring the sealing performance of the inlet water valve core assembly 2 and the pre-infusion valve core assembly 3.

[0028] The working principle of the coffee machine brewing head of the present utility model is as follows:

[0029] In the initial state, both the inlet water valve core assembly 2 and the pre-infusion valve core assembly 3 are in the closed state. The hot water in the boiler enters the seat body 1 from the water inlet to heat the coffee machine brewing head. After heat exchange, the water temperature drops and flows downward and flows back to the boiler from the water return port. Thus, the hot water circulates in the pipeline composed of the boiler and the brewing head, generating a thermosiphon effect. By using this effect, the brewing head is continuously heated to ensure that the brewing head is in a constant temperature state at a certain temperature.

[0030] When making coffee, the handle 6 is pulled upward. The cam 4 connected to the handle 6 pushes the ball 512 on the inlet water valve core assembly 2 upward and compresses the first return spring 516, and makes the valve rod 51 of the inlet water valve core assembly 2 move upward to open the inlet water valve core assembly 2. At this time, the pre-infusion valve core assembly and the pressure relief valve are in the closed state. The hot water then enters the water distribution net 8 of the brewing head through the pipeline in the seat body 1. When the hot water pressure rises to a certain level, the pre-infusion valve core assembly 2 is pushed open. At this time, the coffee powder in the filter cup installed at the water distribution net 8 is soaked by the hot water under a certain pressure, and the water pressure continues to rise until the required pressure is reached, thereby completing the production of coffee.

[0031] After the coffee is made, pull the handle 6 downward. The cam 4 no longer pushes the valve stem 51 of the water inlet valve core assembly 2 upward. The water inlet valve core assembly 2 is reset downward under the action of the second return spring 52 and closes. During rotation, the cam 4 pushes the ball 512 on the pre-infusion valve core assembly 3 downward and compresses the first return spring 516, and makes the valve stem 51 of the pre-infusion valve core assembly 3 move downward, so that the pre-infusion valve core assembly 3 and the pressure relief valve 7 are opened, and part of the pressurized hot water is discharged from the drain port 9.

[0032] The above has described this embodiment in detail with reference to the accompanying drawings. However, the present invention is not limited to the above embodiment, and various changes can be made without departing from the gist within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A valve stem of a coffee machine brewing head, characterized in that: It comprises a rod body (511), wherein a ball (512) which can be pushed by the cam (4) and can roll relative to the rod body (511) is provided on one end of the rod body (511) close to the cam (4) of the coffee machine brewing head.

2. The valve stem of the coffee machine brewing head according to claim 1, characterized in that: The end of the rod body (511) is provided with an inwardly recessed groove (513), the ball (512) is arranged in the groove (513), the rod body (511) is connected with a cover (514) for sealing the notch of the groove (513), and the center of the cover (514) is provided with a through hole (515) for partially protruding the ball (512).

3. The valve stem of the coffee machine brewing head according to claim 2, characterized in that: The sink (513) is provided with a first return spring (516) capable of pushing the ball (512) to return to its original position.

4. A coffee machine brewing head, comprising a base (1), wherein the base (1) is provided with a water inlet valve core assembly (2), a pre-soak valve core assembly (3), a cam (4) and a handle (6), characterized in that: The water inlet valve core assembly (2) and the pre-soak valve core assembly (3) both comprise a valve stem (51), the valve stem (51) comprising a rod body (511), a ball (512) which can be pushed by the cam (4) and can roll relative to the rod body (511) is provided on the rod body (511) at one end close to the cam (4), and the valve stem (51) is sleeved with a second return spring (52) which can push the valve stem (51) to return to its original position.

5. The coffee machine brewing head according to claim 4, characterized in that: The end of the rod body (511) is provided with an inwardly recessed groove (513), the ball (512) is arranged in the groove (513), the rod body (511) is connected with a cover (514) for sealing the notch of the groove (513), and the center of the cover (514) is provided with a through hole (515) for partially protruding the ball (512).

6. The coffee machine brewing head according to claim 5, characterized in that: The sink (513) is provided with a first return spring (516) capable of pushing the ball (512) to return to its original position.

7. The coffee machine brewing head according to claim 4, characterized in that: A pressure relief valve (7) is also provided in the seat body (1) and at the lower end of the pre-soaked valve core assembly (3).

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