Safety valve for a coffee machine

Abstract

The utility model discloses a safety valve for coffee machine, including three -way casing, form water inlet portion, water outlet portion and pressure -relief portion with the intercommunication of outside respectively, the position of being close to water inlet portion, the casing is equipped with the first threaded connection portion and pump body connection, install the first elastic pressure switch in the water outlet portion, and the first elastic pressure switch at least includes the first piston of resettable, and the first piston is used for blocking the water outlet portion, install the second elastic pressure switch in the pressure -relief portion, and one end of pressure -relief portion is located the rear end of first piston, and can communicate with water outlet portion, provide a brand -new installation mode, when installing, adopt the mode of direct connection to make the first threaded connection portion and the water outlet end connection of pump body, and can realize the connection by rotating the casing, and the installation step is simple, and the parts used are few, in addition, by changing the position of pressure -relief portion, can make the water pressure of back priming can act on the second elastic pressure switch, when the pressure that valve body bears is exceeded, the second elastic pressure switch also can open and carry out pressure relief, avoid damaging valve body and coffee machine.

Description

Technical Field

[0001] This utility model belongs to the technical field of coffee machine accessories, specifically a safety valve for coffee machines. Background Technology

[0002] Pressure relief valves are used in coffee machines. Currently, the pressure relief valves used in coffee machines are usually either solenoid valves or mechanical pressure relief valves. Solenoid valves are more expensive and are usually used in high-end coffee machines, while mid-range and low-end coffee machines still use purely mechanical pressure relief valves. An earlier type of pressure relief valve for coffee machines is shown in the Chinese patent document "CN1965744A, Pressure Relief Valve for Coffee Machines". Although the appearance of current pressure relief valves varies, the basic principle is the same, including the specific installation method. Currently, the water inlet of the pressure relief valve is basically connected to the pump body by a water pipe, which also requires the use of a retaining ring. The installation involves many parts, making it inconvenient and also posing a risk of leakage.

[0003] In addition, when the output end of a pressure relief valve is connected to an external device, backflow may occur after the water flow stops, causing the internal pressure of the valve body to increase. However, this pressure cannot be released, and it will be damaged when the pressure exceeds the bearing capacity. Utility Model Content

[0004] The purpose of this invention is to provide a safety valve for coffee machines to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A safety valve for a coffee machine includes a three-way housing, which has an inlet, an outlet, and a pressure relief section that are connected to the outside.

[0007] Near the water inlet, the casing is provided with a first threaded connection part that connects to the pump body;

[0008] A first spring-loaded switch is installed at the water outlet, and the first spring-loaded switch includes at least a resettable first piston, which is used to block the water outlet.

[0009] A second spring-loaded switch is installed in the pressure relief section. One end of the pressure relief section is located at the rear end of the first piston and can be connected to the water outlet section.

[0010] In a further technical solution, the second spring switch includes a second pressing part located inside the pressure relief part, the second pressing part having a pressure relief hole, a second piston abutting at the end of the pressure relief part away from the second pressing part, a second spring being provided between the second piston and the second pressing part, and the second pressing part being threadedly connected to the inner wall of the pressure relief part.

[0011] In a further technical solution, the thread extends into the inner wall of the pressure relief part, and the second pressure-blocking part is provided with an adjustment part.

[0012] In a further technical solution, the first spring-loaded switch includes a first pressing part located inside the water outlet section, the first pressing part having a water outlet hole, the end of the water outlet section away from the first pressing part contacting a first piston, and a first spring being provided between the first piston and the first pressing part.

[0013] In a further technical solution, the end of the water outlet near the water inlet is provided with a conical surface, and the first piston is adapted to it.

[0014] The beneficial effects of this utility model are:

[0015] This utility model provides a brand-new installation method. During installation, the first threaded connection part is connected to the water outlet end of the pump body by direct connection. The connection can be achieved by rotating the housing. The installation steps are simple and fewer parts are used.

[0016] In addition, by changing the position of the pressure relief section, the backflow water pressure can be applied to the second spring switch. When the pressure exceeds the pressure that the valve body can withstand, the second spring switch can also be opened to relieve pressure, thus avoiding damage to the valve body and the coffee machine.

[0017] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0018] Figure 1 : A three-dimensional structural diagram of this utility model.

[0019] Figure 2 : Cross-sectional plan view of this utility model.

[0020] Figure 3 : A three-dimensional cross-sectional structural diagram of this utility model.

[0021] Figure 4 : Exploded view of this utility model.

[0022] Reference numerals: 1-Tee housing, 11-Water inlet, 12-Water outlet, 13-Pressure relief part, 14-First threaded connection part, 2-First spring-loaded switch, 21-First pressure-relief part, 22-Water outlet hole, 23-First piston, 24-First spring, 35-Conical surface, 3-Second spring-loaded switch, 31-Second pressure-relief part, 32-Pressure relief hole, 33-Second piston, 34-Second spring. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0024] Please refer to Figure 1-4 ;

[0025] The safety valve described in this utility model aims to provide a more convenient installation method. Specifically, it includes a three-way housing 1, which has an inlet 11, an outlet 12, and a pressure relief part 13 that communicate with the outside. The shape of the three-way housing 1 can be arbitrary, with the most common shape being "T". A first spring-loaded switch 2 is installed at the outlet 12, and a second spring-loaded switch 3 is installed in the pressure relief part 13. In this embodiment, the specific structure of the first spring-loaded switch 2 and the second spring-loaded switch 3 is not limited. It can refer to the relevant designs in the prior art, such as the relevant designs of "outlet valve plug, water-blocking spring, pressure relief valve plug and pressure relief spring" in the published technical document "CN1965744A, Pressure Relief Valve for Coffee Machine", etc., as long as the corresponding function can be achieved.

[0026] In the existing technology, the water inlet 11 of the pressure relief valve is connected to the pump body via a water pipe. More specifically, a metal connector is riveted to the end of the water pipe. The end of the water pipe with the metal connector is inserted into the water inlet 11, and then a snap ring is used to connect and insert it into the valve body to fix the metal connector. During use, the internal pressure of the valve body is high, which may cause leakage from the position between the sealing ring and the water pipe. In addition, the installation space in the coffee machine is narrow, and the water pipe, metal connector and snap ring are required. Manual hand can be inserted to complete the installation, which is the reason for the low installation efficiency and high cost.

[0027] This utility model provides a novel installation method. Located near the water inlet 11, the housing is provided with a first threaded connection part 14. During installation, the first threaded connection part 14 is directly connected to the water outlet end of the pump body. Of course, a sealing gasket or other sealing structure is provided between the first threaded connection part 14 and the pump body. However, the most important sealing method is still the threaded structure. During installation, you only need to insert the housing into the coffee machine, then align the first threaded connection part 14 with the water outlet end of the pump body, and rotate the housing to achieve the connection. The installation steps are simple and few parts are used.

[0028] There are many connection methods for the first threaded connection part 14, such as the snap-fit ​​method. Although this method can also achieve the connection, in order to save costs, the snap-fit ​​part is made by one-piece injection molding without adding any additional technical parts. However, because the snap-fit ​​has weak pressure resistance, the housing is under high pressure during use. Initially, most of the force is applied to the connection between the pump body and the housing, which can easily cause the snap-fit ​​to break. Moreover, the snap-fit ​​molding is complicated. Therefore, after testing, the first threaded connection part 14 is connected to the pump body by a thread. This method is not only simple to form, but also has good sealing performance and good pressure resistance, preventing the connection between the housing and the pump body from bursting and leaking.

[0029] Preferably, one end of the pressure relief part 13 is located at the rear end of the first spring pressure switch 2 and is connected to the water outlet part 12. That is to say, the pressure relief part 13 can only function after the first spring pressure switch 2 is opened before the high-speed water flow is output from the water inlet part 11.

[0030] In use, a high-speed water flow is input into the inlet 11, which opens the first spring switch 2. At this time, the inlet 11 and the outlet 12 are connected, and the high-speed water flow can be output from the outlet 12 to the external device. At this time, the water pressure acts on the second spring switch 3. If the input water pressure increases beyond the pressure that the second spring switch 3 can withstand, the second spring switch 3 will open, allowing some water to flow out from the pressure relief part 13, thereby achieving the effect of pressure relief.

[0031] It should be noted that the device connected to the water outlet 12 is the boiler in the coffee machine. When the water inlet is stopped, the first spring switch 2 blocks the water outlet of the water inlet 11, which acts as a one-way valve to prevent water from flowing back into the water pump from the water inlet 11, thus protecting the water pump. Secondly, when the boiler is heating water, the backflow water may increase, which may lead to an increase in the pressure inside the casing. Since the pressure relief part 13 is located at the water outlet 12, the backflow water pressure can act on the second spring switch 3. Therefore, when the pressure exceeds the pressure that the valve body can withstand, the second spring switch 3 can also open to relieve pressure and avoid damage to the valve body and the coffee machine.

[0032] In this embodiment, the first spring-loaded switch 2 includes a first pressing part 21 located inside the water outlet part 12. The first pressing part 21 is provided with a water outlet hole 22. The end of the water outlet part 12 away from the first pressing part 21 abuts against a first piston 23. A first spring 24 is provided between the first piston 23 and the first pressing part 21. The end of the water outlet part 12 near the water inlet part 11 is provided with a conical surface 25, which is adapted to the first piston 23. It should be noted that the diameter of the hole in the water outlet part 12 is larger than the outer diameter of the first piston 23, and water can pass between the two.

[0033] Taking the water supply being stopped as an example, the pressure relief part 13 is located behind the first piston 23. When the water supply is in progress, the water pressure can act on the second spring switch 3. At this time, the pressure relief part 13 can be located in front of or behind the first piston 23, preferably behind. Of course, this mainly depends on the elasticity of the first spring 24. In addition, when the water supply is in progress, although the water pressure will push the first piston 23 towards the first pressure-blocking part 21, the second spring switch 3 and the pressure relief part 13 will offset part of the water pressure. Of course, although the water pressure increases, it will not be so high as to be unbearable, so that the first piston 23 is maintained in a certain position range and will not block the water outlet 22, thus maintaining the water output.

[0034] One embodiment of the present invention relates to the second spring-loaded switch 3, specifically including a second pressing part 31 located inside the pressure relief part 13, a pressure relief hole 32 provided in the second pressing part 31, a second piston 33 abutting at one end of the pressure relief part 13 away from the second pressing part 31, a second spring 34 provided between the second piston 33 and the second pressing part 31, and the second pressing part 31 being threadedly connected to the inner wall of the pressure relief part 13;

[0035] The aforementioned threaded connection structure is an excellent pressure-bearing and sealing structure. Moreover, the use of threaded connection in this embodiment provides convenience in the production and maintenance of the pressure relief valve. The second spring 34 is made of metal. Whether it is a defective product or damaged during use, it can be repaired by unscrewing the second pressing part 31, replacing the internal second spring 34 or the second piston 33, and finally tightening the second pressing part 31.

[0036] It should be noted that the orifice diameter of the pressure relief section 13 is larger than the outer diameter of the second piston 33, so the water can flow out from the gap between the pressure relief section 13 and the second piston 33, and finally flow out from the pressure relief hole 32; preferably, an inlet and a conical surface are provided at the water inlet end of the pressure relief section 13, and a plug is provided at the end face of the second piston 33. The plug can be inserted into the inlet to enhance the sealing, while the conical surface has a guiding function.

[0037] In addition, different models of coffee machines have different water pressure requirements, and the most directly related pressure relief timing, namely the setting of the second spring 34, is particularly critical. With the same parts, the greater the initial compression of the second spring 34, the greater the pressure required to push the second piston 33, which means that a greater water pressure is required to push the second piston 33. Therefore, in this embodiment, the thread extends along the inner wall of the pressure relief part 13, and the second pressure part 31 is provided with an adjustment part. The adjustment part can be a groove. By inserting a screwdriver into the adjustment part, the second pressure part 31 can be turned to adjust the position of the second pressure part 31, that is, to adjust the compression state of the second spring 34 in the initial state to meet different usage requirements, without having to re-mold and produce a new pressure relief valve.

[0038] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A safety valve for a coffee machine, comprising a three-way housing (1) having a water inlet (11), a water outlet (12), and a pressure relief section (13) communicating with the outside, characterized in that: Near the water inlet (11), the housing is provided with a first threaded connection (14) that connects to the pump body; A first spring-loaded switch (2) is installed at the water outlet (12). The first spring-loaded switch (2) includes at least a resettable first piston (23) for blocking the water outlet (12). A second spring-loaded switch (3) is installed in the pressure relief section (13). One end of the pressure relief section (13) is located at the rear end of the first piston (23) and can communicate with the water outlet section (12).

2. A safety valve for a coffee machine according to claim 1, characterized in that: The second spring switch (3) includes a second pressing part (31) located in the pressure relief part (13). The second pressing part (31) is provided with a pressure relief hole (32). The end of the pressure relief part (13) away from the second pressing part (31) abuts against a second piston (33). A second spring (34) is provided between the second piston (33) and the second pressing part (31). The second pressing part (31) is threadedly connected to the inner wall of the pressure relief part (13).

3. A safety valve for a coffee machine according to claim 2, characterized in that: The thread extends into the inner wall of the pressure relief part (13), and the second pressure-resistant part (31) is provided with an adjustment part.

4. A safety valve for a coffee machine according to any one of claims 1-3, characterized in that: The first spring switch (2) includes a first pressing part (21) located in the water outlet part (12), the first pressing part (21) is provided with a water outlet hole (22), the end of the water outlet part (12) away from the first pressing part (21) is in contact with a first piston (23), and a first spring (24) is provided between the first piston (23) and the first pressing part (21).

5. A safety valve for a coffee machine according to claim 4, characterized in that: The water outlet (12) has a conical surface (25) at one end near the water inlet (11), and the first piston (23) is adapted to it.

Images