A composite valve with both liquid on-off and pressure relief functions

Abstract

The present invention discloses a composite valve with both liquid on / off and pressure relief functions, comprising a valve body with a valve cavity, the valve body being provided with a water inlet channel, a water outlet channel, a pressure relief channel, and a valve port, and a valve needle body being provided within the valve cavity. The valve needle body is characterized in that a transition valve cavity is provided within the valve needle body, the valve needle body being provided with a transition water inlet channel, a transition water outlet channel, a transition valve cavity, and a transition valve port; a first sealing member is provided between the valve needle body and the inner wall of the valve cavity; a first plug is provided at the front end of the valve needle body; backward movement of the valve needle body can block the pressure relief channel; the tail end of the valve needle body is supported by a first spring, which keeps the first plug in the tendency to block the valve port and allows the valve needle body to move forward to open the pressure relief channel; a second plug and a second spring are provided within the transition valve cavity, the second spring acting on the second plug to keep it in the tendency to block the transition valve port. A water extraction machine using this composite valve can reduce costs and can be used with purified tap water.

Description

Technical Field

[0001] The present invention relates to a composite valve with both liquid on-off and pressure relief functions. The composite valve is particularly suitable for use in a water supply circuit of a coffee, tea or various beverage extraction machines. Background Art

[0002] To achieve optimal brewing results, coffee machines utilize high-temperature, high-pressure extraction. This results in a certain amount of hot water remaining inside the machine even after brewing. Opening the handle at this point can be dangerous, as hot water can easily splash out and scald the user. Furthermore, some existing coffee machines utilize hydraulic brewing systems that seal and lock the brewing chamber. Even after brewing, the machine remains locked in a high-temperature, high-pressure state, making it impossible to open.

[0003] Existing manufacturers typically use a pressure relief valve to relieve pressure in coffee machines after brewing. When the coffee machine finishes brewing, the pressure relief valve inside the machine releases the high-temperature, high-pressure hot water, thereby resolving the aforementioned issues of hot water spilling and the machine becoming inoperable. For example, Chinese invention patent No. ZL201310629001.8 (publication No. CN103615580B) for a "two-way pressure relief valve" and Chinese utility model patent No. ZL201720674194.2 (publication No. CN207506424U) for a "pressure relief valve" disclose such a pressure relief valve structure.

[0004] With improved drinking water quality worldwide, tap water in many countries now meets drinking water standards. As water resources change, various decanters have eliminated their traditional purified water tanks, connecting the machine's water pipes directly to the mains. Tap water in various countries has a certain pressure. For example, in China, the pressure of drinking water normally does not exceed 0.35 MPa. Under these conditions, simply installing a conventional pressure relief valve inside the decanter presents a problem: when the decanter is not operating, pressurized tap water flows directly through the pump and into the pressure relief valve. However, this pressure is insufficient to seal the valve's pressure relief port, causing it to remain depressurized, resulting in wasted drinking water. To avoid wasting water resources, a common solution is to connect a solenoid valve between the tap water supply and the decanter's pump to control the flow of water. This combination of a solenoid valve and a pressure relief valve increases the price of decanters, compromising their competitive advantage. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a composite valve with a reasonable structure and both liquid on-off and pressure relief functions in response to the above-mentioned existing technical status. The brewing machine using the composite valve can reduce costs and can be connected to purified tap water for use.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: a composite valve with both liquid on-off and pressure relief functions, including a valve body with a valve cavity inside, the valve body is provided with a water inlet channel, a water outlet channel and a pressure relief channel connected to the valve cavity, the water inlet channel is connected to the valve cavity through the valve port, and a valve needle body that can move along the axial direction of the valve cavity is provided in the valve cavity; it is characterized in that: a transition valve cavity is provided inside the valve needle body, a transition water inlet channel for connecting the valve port and the transition valve cavity, and a transition water outlet channel for connecting the water outlet channel and the transition valve cavity are provided on the valve needle body, the transition water inlet channel is connected through the transition valve The outlet is connected to the transition valve cavity; a first sealing member is provided between the outer periphery of the valve needle body and the inner wall of the valve cavity, and the first sealing member is located between the water outlet channel and the valve port to block direct communication between the two; a first plug is provided at the front end of the valve needle body, and the backward movement of the valve needle body can block the pressure relief channel, and the tail end of the valve needle body is supported by a first spring so that the first plug maintains the tendency to block the valve port and the valve needle body moves forward to open the pressure relief channel; a second plug and a second spring are provided in the transition valve cavity, and the second spring acts on the second plug to keep it in the tendency to block the transition valve port.

[0007] A further improvement is that a sealing gasket is provided at the inlet of the pressure relief passage. The sealing gasket defines a flow channel connecting the valve cavity and the pressure relief passage. When the valve needle body moves axially rearward, the tail end of the valve needle body forms a seal with the sealing gasket, thereby blocking the flow channel above the sealing gasket. The sealing gasket is made of a flexible material, allowing the tail end of the valve needle body to better fit and seal with the sealing gasket, thereby providing a more secure seal for the pressure relief passage.

[0008] As a further improvement, a metal washer is provided on the inner surface of the sealing gasket, and the first spring is supported between the metal washer and the tail end of the valve needle body. Because the sealing gasket is made of a flexible material and is easily damaged by direct contact with the spring, the metal washer can better protect the sealing gasket.

[0009] A further improvement is that the valve body comprises a valve seat and a pressure relief connector. The pressure relief connector is plugged into the rear end of the valve seat, and a second seal is provided between the outer periphery of the pressure relief connector and the inner wall of the valve seat. The valve cavity, water inlet channel, water outlet channel, and valve port are all provided on the valve seat, and the pressure relief channel is provided on the pressure relief connector. The two-part valve body facilitates machining of the channels and facilitates assembly of the valve needle body into the valve body.

[0010] Preferably, the pressure relief connector is plugged into the tail end of the valve seat by means of a snap-fit, which facilitates assembly.

[0011] As an improvement, the mating surface between the transition valve port and the second plug is provided with multiple radial grooves, forming a small gap between the radial grooves and the second plug. Water entering the small gap created by the radial grooves generates a reverse force, which makes it easier for the second plug to open the transition valve port, allowing water to quickly flow through the transition outlet channel and out of the outlet channel. The provision of the radial grooves makes the second plug more responsive, shortening the reaction time to open the transition valve port.

[0012] In a further improvement, the valve needle body comprises a valve needle head and a valve needle tail. The valve needle head is inserted into the front end of the valve needle tail, and the first plug is fixed to the front end of the valve needle head. When the valve needle tail moves backward, its rear end surface can block the pressure relief channel. The valve needle body is composed of two parts, which facilitates the processing of each channel and facilitates the assembly of the second plug and the second spring into the valve needle body.

[0013] Preferably, the transition water inlet channel and the transition valve port are arranged in the valve needle head, the transition water outlet channel is arranged on the valve needle tail, and the first sealing member is sleeved on the outer periphery of the valve needle head.

[0014] Preferably, the first plug is tightly inserted into the jack at the front end of the valve needle head. This structure can firmly fix the first plug at the front end of the valve needle head and prevent it from falling off.

[0015] Preferably, the valve needle head is plugged into the front end of the valve needle tail by means of a snap-fit, which facilitates assembly.

[0016] Compared with the prior art, the advantages of the present invention are: the composite valve has two one-way valve structures, and the valve needle body keeps the first plug blocking the valve port under the action of the first spring to seal the water inlet channel with a set pressure value. When the water pressure in the water inlet channel increases, the valve needle body is pushed backward, and the backward-moving valve needle body blocks the pressure relief channel, and water cannot flow through the pressure relief valve. The greater the water pressure, the more tightly the pressure relief channel is blocked, and the water pressure will not break through the pressure relief channel and flow out from the pressure relief channel. The water pressure continues to increase, and the second plug opens the transition valve cavity. The high-pressure water flows through the transition water inlet channel, the transition valve port, the transition valve cavity and the transition water outlet channel in turn, and finally flows out from the water outlet channel; when the water pressure decreases, the valve needle body moves forward under the action of the first spring, and the first plug at the front end of the valve needle body blocks the valve port, blocking the connection between the water inlet channel and the water outlet channel; the forward movement of the valve needle body fully opens the pressure relief channel at the same time, and the second plug blocks the transition valve port under the action of the second spring. Since the brewing system is still in a high-pressure state at this time, the excess water and pressure in the brewing system and pipeline can only be discharged through the pressure relief channel to relieve the pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the three-dimensional structure of an embodiment of the present invention;

[0018] Figure 22 is a cross-sectional view of an embodiment of the present invention (initial state and pressure relief state);

[0019] Figure 3 This is a cross-sectional view of an embodiment of the present invention in a normal working state (tap water passing through the water outlet channel);

[0020] Figure 4 This is a front view of the valve needle body in an embodiment of the present invention;

[0021] Figure 5 A cross-sectional view of a valve needle body in an embodiment of the present invention;

[0022] Figure 6 is a cross-sectional view of a valve needle head in an embodiment of the present invention;

[0023] Figure 7 It is a three-dimensional exploded view of an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0025] like Figures 1 to 7 FIG. 1 is a preferred embodiment of the present invention.

[0026] A composite valve with both liquid on-off and pressure relief functions includes a valve body 1 with a valve cavity 1a inside. The valve body 1 is provided with a water inlet channel 1b, a water outlet channel 1c and a pressure relief channel 1d connected to the valve cavity 1a. The water inlet channel 1b is connected to the valve cavity 1a through a valve port 1e. A valve needle body 3 capable of axial movement along the valve cavity 1a is provided in the valve cavity 1a.

[0027] A transition valve cavity 3a is provided inside the valve needle body 3, and a transition water inlet channel 3b for communicating with the valve port 1e and the transition valve cavity 3a, and a transition water outlet channel 3c for communicating with the water outlet channel 1c and the transition valve cavity 3a are provided on the valve needle body 3. The transition water inlet channel 3b is communicated with the transition valve cavity 3a through the transition valve port 3d; a first sealing member 4a is provided between the outer periphery of the valve needle body 3 and the inner wall of the valve cavity 1a, and the first sealing member 4a is located between the water outlet channel 1c and the valve port 1e to block direct communication between the two. The front of the valve needle body 3 A first plug 2a is provided at the end, and the first plug 2a is made of flexible material. The backward movement of the valve needle body 3 can block the pressure relief channel 1d. The tail end of the valve needle body 3 is supported by the first spring 5a to make the first plug 2a maintain the trend of blocking the valve port 1e and make the valve needle body 3 move forward to open the pressure relief channel 1d; a second plug 2b and a second spring 5b are provided in the transition valve cavity 3a. The second plug 2b is made of flexible material, and the second spring 5b acts on the second plug 2b to make it maintain the trend of blocking the transition valve port 3d.

[0028] A sealing gasket 6 is provided at the inlet end of the pressure relief channel 1d. A flow passage 61 is defined in the sealing gasket 6, connecting the valve cavity 1a and the pressure relief channel 1d. When the valve needle body 3 moves axially rearward, the tail end of the valve needle body 3 forms a seal with the sealing gasket 6, thereby blocking the flow passage 61 in the sealing gasket 6. A metal gasket 7 is provided on the inner surface of the sealing gasket 6, and a first spring 5a is supported between the metal gasket 7 and the tail end of the valve needle body 3.

[0029] The valve body 1 includes a valve seat 11 and a pressure relief joint 12. The pressure relief joint 12 is plugged into the tail end of the valve seat 11 by means of a snap-fit, and a second sealing member 4b is provided between the outer periphery of the pressure relief joint 12 and the inner wall of the valve seat 11. The valve cavity 1a, the water inlet channel 1b, the water outlet channel 1c and the valve port 1e are all provided on the valve seat 11, and the pressure relief channel 1d is provided on the pressure relief joint 12.

[0030] A plurality of radial grooves 3d1 are provided at the fitting surface between the transition valve port 3d and the second plug 2b, and a small gap is formed between the radial grooves 3d1 and the second plug 2b.

[0031] The valve needle body 3 includes a valve needle head 31 and a valve needle tail 32. The valve needle head 31 is snap-fitted to the front end of the valve needle tail 32. The first plug 2a is fixed to the front end of the valve needle head 31 and tightly inserted into the socket 311 at the front end of the valve needle head 31. When the valve needle tail 32 moves backward, its rear end surface can block the pressure relief channel 1d.

[0032] The transition water inlet channel 3b and the transition valve port 3d are arranged in the valve needle head 31 , the transition water outlet channel 3c is arranged on the valve needle tail 32 , and the first sealing member 4a is sleeved on the outer periphery of the valve needle head 31 .

[0033] This composite valve is particularly suitable for use in the working water path of a coffee machine (such as a coffee machine). The working principle and process of this composite valve in a coffee machine are as follows:

[0034] like Figure 2 As shown, in the initial state, the brewing machine is directly connected to the tap water pipe. Tap water enters the composite valve's water inlet channel 1b through the water pump. The valve needle body 3, acted upon by the first spring 5a, moves forward, and the first plug 2a thereon blocks the valve opening 1e, sealing the tap water within the water inlet channel 1b and preventing it from entering the valve chamber 1a. Simultaneously, the forward movement of the valve needle body 3 causes the rear end surface of the valve needle tail 32 to separate from the sealing gasket 6, placing the pressure relief channel 1d in a conductive, pressure-relieving state. The water inlet channel 1b and the water outlet channel 1c are disconnected.

[0035] like Figure 3As shown, the state in which tap water enters the valve cavity 1a and passes through the water outlet channel 1c: the water pump of the beverage machine starts working, the pressure in the water inlet channel 1b increases, pushing the valve needle body 3 toward the pressure release joint 12, and the valve needle tail 32 is in close contact with the sealing gasket 6 to form a sealed state. At this time, the pressure relief channel 1d is in a sealed disconnected state; the water pump of the beverage machine continues to work, and the pressure generated by the water pump pushes the second plug 2b away for a distance. The tap water passes through the water inlet channel 1b, the valve port 1e, the transition water inlet channel 3b, the transition valve port 3d, and the transition water outlet channel 3c and is connected to the water outlet channel 1c. At this time, the water inlet channel 1b and the water outlet channel 1c are in a fully connected state, and water enters the water outlet channel 1c smoothly.

[0036] like Figure 2 As shown, it returns to the initial state and releases pressure: after the water pump of the beverage machine stops working, the pressure in the water inlet channel 1b returns to the tap water pressure value, and the valve needle body 3 moves toward the valve port 1e under the reaction of the first spring 5a, so that the first plug 2a blocks the valve port 1e. The forward movement of the valve needle body 3 causes the rear end surface of the valve needle tail 32 to separate from the sealing gasket 6, and the pressure relief channel 1d is in a conductive pressure relief state. At the same time, the second plug 2b is reset under the action of the second spring 5b, blocking the transition valve port 3d. The water in the transition water inlet channel 3b enters the position of the valve needle tail 32 through the small gap formed between the radial groove 3d1 and the second plug 2b. Because the water inlet channel 1b and the water outlet channel 1c are in a disconnected state, the pressure relief channel 1d is in a conductive pressure relief state, and the water in the pipeline is discharged from the pressure relief channel 1d through the water outlet channel 1c and the valve cavity 1a to complete the pressure relief.

[0037] It should be noted that in the description of this embodiment, the terms "front, back", "left, right", "inside, outside", "up, down", etc. indicating directions or positional relationships are all based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. The terms "install", "connect", and "connected" should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrally connected; they can be directly connected, or indirectly connected through an intermediate medium, or they can be internal connections between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A composite valve having both liquid on-off and pressure relief functions, comprising a valve body (1) having a valve cavity (1a) therein, the valve body (1) being provided with a water inlet channel (1b), a water outlet channel (1c) and a pressure relief channel (1d) communicating with the valve cavity (1a), the water inlet channel (1b) being communicated with the valve cavity (1a) through a valve port (1e), and a valve needle body (3) being provided in the valve cavity (1a) and being capable of axial movement along the valve cavity (1a); characterized in that: A transition valve cavity (3a) is provided inside the valve needle body (3), and a transition water inlet channel (3b) for communicating with the valve port (1e) and the transition valve cavity (3a), and a transition water outlet channel (3c) for communicating with the water outlet channel (1c) and the transition valve cavity (3a) are provided on the valve needle body (3). The transition water inlet channel (3b) is communicated with the transition valve cavity (3a) through the transition valve port (3d). A first sealing member (4a) is provided between the outer periphery of the valve needle body (3) and the inner wall of the valve cavity (1a). The first sealing member (4a) is located between the water outlet channel (1c) and the valve port (1e) to block the two. The valves are directly connected, a first plug (2a) is provided at the front end of the valve needle body (3), and the backward movement of the valve needle body (3) can block the pressure relief channel (1d), and the tail end of the valve needle body (3) is supported by a first spring (5a) so that the first plug (2a) keeps the tendency to block the valve port (1e) and the valve needle body (3) moves forward to open the pressure relief channel (1d); a second plug (2b) and a second spring (5b) are provided in the transition valve cavity (3a), and the second spring (5b) acts on the second plug (2b) so that it keeps the tendency to block the transition valve port (3d); A sealing gasket (6) is provided at the inlet end of the pressure relief channel (1d), and a flow channel (61) is opened on the sealing gasket (6) to connect the valve cavity (1a) and the pressure relief channel (1d). After the valve needle body (3) moves axially backward, the tail end of the valve needle body (3) forms a seal with the sealing gasket (6) to block the flow channel (61) on the sealing gasket (6); The valve body (1) comprises a valve seat (11) and a pressure release joint (12); the pressure release joint (12) is plugged into the tail end of the valve seat (11), and a second sealing member (4b) is provided between the outer periphery of the pressure release joint (12) and the inner wall of the valve seat (11); the valve cavity (1a), the water inlet channel (1b), the water outlet channel (1c) and the valve port (1e) are all provided on the valve seat (11), and the pressure relief channel (1d) is provided on the pressure release joint (12); A plurality of radial grooves (3d1) are provided at the fitting surface between the transition valve port (3d) and the second plug (2b), and a small gap is formed between the radial grooves (3d1) and the second plug (2b); The valve needle body (3) comprises a valve needle head (31) and a valve needle tail (32), wherein the valve needle head (31) is plugged into the front end of the valve needle tail (32), and the first plug (2a) is fixed to the front end of the valve needle head (31). When the valve needle tail (32) moves backward, its rear end surface can block the pressure relief channel (1d); The transition water inlet channel (3b) and the transition valve port (3d) are arranged in the valve needle head (31), the transition water outlet channel (3c) is arranged on the valve needle tail (32), and the first sealing member (4a) is sleeved on the outer periphery of the valve needle head (31).

2. The composite valve with both liquid on / off and pressure relief functions according to claim 1, characterized in that: A metal gasket (7) is provided on the inner surface of the sealing gasket (6), and the first spring (5a) is supported between the metal gasket (7) and the tail end of the valve needle body (3).

3. The composite valve with both liquid on / off and pressure relief functions according to claim 1, characterized in that: The pressure release joint (12) is plugged into the tail end of the valve seat (11) by means of a snap fit.

4. The compound valve with both liquid on / off and pressure relief functions according to claim 1, characterized in that: The first plug (2a) is tightly fitted and inserted into the insertion hole (311) at the front end of the valve needle (31).

5. The compound valve with both liquid on-off and pressure relief functions according to claim 1, characterized in that: The valve needle head (31) is plugged into the front end of the valve needle tail (32) by means of a snap fit.

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