A fluid switch device that opens a passage in response to negative pressure

Abstract

The invention discloses a fluid switch device which opens the channel according to negative pressure. The device comprises a shell, an elastic diaphragm in the shell, the elastic diaphragm divides the shell into upper and lower parts, the lower part is provided with fluid inlet and outlet on the side surface, the lower part is further provided with soft rubber, stop lever, push rod and pressure applying part, the soft rubber has inlet and outlet parts and channel part connecting them, the soft rubber is installed on the fluid inlet from the inlet part, the stop lever is above the soft rubber and outside the channel part, the push rod is pressed on the soft rubber by the pressure applying part, the soft rubber is bent at the channel part by the action of the push rod and the stop lever, the channel is closed by the contact of the upper and lower walls at the channel part, the elastic diaphragm is above the push rod and close to or contacts the push rod, the elastic diaphragm is pressed to deform and acts on the push rod. When the fluid outlet has negative pressure, the elastic diaphragm is pressed to deform and acts on the push rod. The device has the advantages of simple structure, easy assembly and good sealing performance.

Description

Technical Field

[0001] The invention belongs to a fluid switch device, which relates to a mechanism for opening a fluid channel based on negative pressure, suitable for controlling liquid or gas. More specifically, it is a fluid switch that opens the channel by controlling a soft rubber part through an elastic diaphragm under negative pressure. Existing technology

[0002] In the past, tea brewing devices were equipped with a water tank and a water inlet mechanism. Because the water tank was positioned at the bottom, a pump was required to pump water from the tank to the inlet mechanism, which then delivered the water to the kettle. Typically, the water tank is equipped with a valve to control the water supply, and the valve can be opened manually or automatically. Automatic opening typically uses a circuit to control the valve, which also requires coordination between the circuit and the pump. This places high demands on the water inlet mechanism, resulting in a complex structure and high costs. To address this, improvements have been made, using the negative pressure generated by the pump at the water outlet to open the water inlet channel, simplifying the structure. The following documents provide some relevant information to illustrate this situation.

[0003] Chinese utility model patent CN 217030142U discloses a negative pressure valve that uses a water pump to generate negative pressure at the water outlet 22, causing the air pressure diaphragm 5 to move upward and drive the ejector pin 71 to move upward. The ejector pin 71 overcomes the spring 8 to push open the valve plug 4, thereby opening the valve port 23, allowing water to flow from the water inlet 21 through the valve port 23 to the water outlet 22.

[0004] Chinese invention patent application CN 102135193A also discloses a three-way valve, which also generates negative pressure at the water outlet 102, causing the pressure-sensitive diaphragm 114 to deform and drive the control rod 116 to move downward, and the control rod 116 to overcome the water sealing spring 112 to cause the sealing head assembly 113 to leave the water sealing port 117, thereby allowing the water in the water filter chamber 108 to flow to the water outlet 102 through the water sealing port 117.

[0005] In addition, the use of compressive deformation of the diaphragm to open the valve plug can also be applied to the control of the gas line, which is also reflected in the relevant literature.

[0006] Chinese utility model patent CN 2407204Y discloses an automatic temperature control device for a gas water heater. The device uses water from a water channel inlet 17 through a water inlet 18 to impact a pressure diaphragm 13, causing the pressure diaphragm 13 to push against a push pin 14. The push pin 14 pushes up a valve plug 40, allowing gas at a gas inlet 31 to enter a gas channel 32.

[0007] In all the above-mentioned solutions, the valve port is blocked by the valve plug, and a ejector pin or a control rod is used to act on the valve plug to move it away from the valve port to achieve channel connectivity. However, this structure has the problem that the valve plug blocks the valve port and its sealing performance is poor, which easily causes leakage. In addition, during assembly and maintenance, it is also necessary to consider the coordination between the ejector pin, the valve plug and the spring so that the ejector pin can move in alignment with the valve plug to ensure its normal function. Summary of the Invention

[0008] The present invention aims to address the above-mentioned deficiencies and provide a fluid switch device that opens a channel based on negative pressure. The fluid switch device does not require circuit control or electricity supply, nor does it adopt a blocking structure. Instead, it uses negative pressure to act on an elastic diaphragm, which controls a soft rubber member through a pressure-applying member, allowing the soft rubber member to control the passage to open the fluid channel.

[0009] The purpose of the present invention is achieved by the following solutions:

[0010] A fluid switch device that opens a channel based on negative pressure includes a shell, in which an elastic diaphragm is installed, and the elastic diaphragm divides the shell into an upper part and a lower part, wherein the upper part is connected to the outside world and the lower part is provided with a fluid inlet and a fluid outlet on the side; its characteristic is that a soft rubber part, a baffle, a push rod and a pressure-applying part are also provided in the lower part; the soft rubber part has an inlet part, an outlet part, and a channel part connecting the inlet part and the outlet part, and the soft rubber part is installed at the fluid inlet by its inlet part; the baffle is above the soft rubber part and is located outside the channel part; the outlet part is provided on the push rod; the push rod presses the soft rubber part upward under the action of the pressure-applying part; the soft rubber part is acted upon by the push rod and the baffle so that the soft rubber part is bent in the channel part, and the channel part is deformed so that the upper and lower walls contact each other to close the channel; the elastic diaphragm is located above the push rod and is close to or in contact with the push rod, and it can be deformed under pressure to act on the push rod.

[0011] Preferably, in the above solution, the outlet portion is provided on the push rod and moves with the push rod.

[0012] More preferably, in the above solution, the pressure member may be a spring or a pair of magnets with their ends of the same polarity close to each other, preferably a spring.

[0013] In this way, when there is negative pressure at the fluid outlet, the elastic diaphragm will contract downward, acting on the push rod and overcoming the pressure-applying member to move the push rod downward. The outlet part is no longer pressed by the push rod, and the soft rubber member recovers its deformation. The upper and lower walls of the channel part no longer contact each other and are connected, so that the fluid can enter the shell from the fluid inlet and through the soft rubber member and then flow out from the fluid outlet.

[0014] When there is no negative pressure at the fluid outlet, the elastic diaphragm will return to its original shape and no longer act on the push rod. The push rod will move upward under the action of the pressure member and drive the outlet part to move upward. Under the obstruction of the blocking rod, the soft rubber part will bend at the channel part together, so that the upper and lower walls of the channel will contact and close the channel.

[0015] The fluid switch device thus obtained can control the opening of the channel according to the negative pressure generated at the fluid outlet, so as to realize the flow of fluid from the fluid inlet through the soft rubber part to the fluid outlet, thereby achieving the function of automatic opening.

[0016] The present invention creates a fluid switch device that opens a channel based on negative pressure. It does not require the setting of a circuit or the supply of electricity. It can also use negative pressure to control the flow of fluid to achieve the opening or closing of the device, which is conducive to simplifying the structure and reducing costs.

[0017] The fluid switching device of the present invention, which opens the channel based on negative pressure, no longer adopts the structure of a valve plug to block the valve port. Instead, it utilizes the bending of the soft rubber channel and presses the upper and lower walls thereof at the bending point to make them contact, thereby closing the channel. This is conducive to further improving the sealing performance and overcoming the disadvantage that the valve port closed by the valve plug is prone to leakage.

[0018] This fluid switch device, which opens the channel based on negative pressure, uses the deformation, bending, and recovery of the soft rubber channel to control the opening and closing of the channel, further optimizing the device structure. This avoids the problem of previous technologies requiring the ejector pin or control rod to always align with the valve plug during assembly or use, thereby reducing the accuracy requirements of the device during assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of a cross-sectional view of a specific implementation structure of the invention;

[0020] Figure 2 yes Figure 1 A schematic diagram of a cross-section of a fluid switch device in an open state;

[0021] Figure 3 yes Figure 1 Schematic diagram of the exploded components of the fluid switch device. DETAILED DESCRIPTION

[0022] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings:

[0023] Reference Figure 1 — Figure 3In this specific embodiment, the fluid switch device that opens the channel based on negative pressure includes a lower shell 1 and an upper shell 2. The elastic diaphragm 4 is installed between the upper shell 2 and the lower shell 1. The upper part of the elastic diaphragm 4 is the upper shell 2 and the lower part is the lower shell 1. The lower shell 1 is provided with a fluid inlet 11 and a fluid outlet 12 on the side. The lower shell 1 is also provided with a soft rubber member 7, a blocking rod 6, a push rod 3 and two springs 5. The soft rubber member 7 has an inlet portion 71, an outlet portion 73 and a channel portion 72 connecting the inlet portion 71 and the outlet portion 73. The soft rubber member 7 is installed at the fluid inlet 1 by its inlet portion 71. 1, the blocking rod 6 is above the soft rubber part 7 and outside the channel part 72, and the outlet part 73 is fixed in the push rod 3 so that the outlet part 73 can move with the push rod 3; the push rod 3 is acted upon by the two springs 5 ​​to press the outlet part 73 upward and inward, and the soft rubber part 7 is acted upon by the push rod 3 and the blocking rod 6 so that the soft rubber part 7 is deformed and bent at the channel part 72. As the channel part 72 is further bent, its upper wall 72a and lower wall 72b come into contact with each other to close the channel part 72. The elastic diaphragm 4 is located above and close to the push rod 3, and can be deformed under pressure to act on the push rod 3.

[0024] In this way, when negative pressure exists at the fluid outlet 12, the elastic diaphragm 4 will deform and act downward on the push rod 3, causing the push rod 3 to overcome the two springs 5 ​​and move downward. At this time, the push rod 3 releases the restriction on the outlet portion 73, allowing the soft rubber member 7 to recover its deformation. As a result, its upper wall 72a and lower wall 72b no longer contact and are connected. The fluid can then enter the upper and lower shells from the connecting inlet 11 through the soft rubber member and flow out from the upper and lower shells through the fluid outlet 12.

[0025] From the above embodiment, it can be seen that the closing of the channel is simply the upward movement of the push rod under the action of the spring, which drives the outlet part to move upward, and with the assistance of the blocking rod, the channel part is bent. This structure in which the upper and lower walls of the channel are in contact and pressed to be closed can reduce the accuracy requirements for assembly during installation. In addition, the position of the bending of the channel part is random, that is, the bending is not limited to a certain position, which is also conducive to improving the service life of the soft rubber parts.

Claims

1. A fluid switch device that opens a channel based on negative pressure, comprising a housing, an elastic diaphragm installed in the housing, the elastic diaphragm dividing the housing into an upper part and a lower part, wherein: The upper part is connected to the outside world, and the lower part is provided with a fluid inlet and a fluid outlet on the side; its characteristics are: a soft rubber part, a baffle, a push rod and a pressure part are also provided in the lower part; the soft rubber part has an inlet part, an outlet part, and a channel part connecting the inlet part and the outlet part, and the soft rubber part is installed at the fluid inlet by its inlet part; the baffle is above the soft rubber part and is located outside the channel part; the push rod is pressed upward by the pressure part to press the soft rubber part; the soft rubber part is acted upon by the push rod and the baffle so that the soft rubber part is bent in the channel part, and the channel part is deformed so that the upper and lower walls contact each other to close the channel; the elastic diaphragm is located above the push rod and is close to or in contact with the push rod, and it can be deformed under pressure to act on the push rod.

2. The fluid switch device according to claim 1, wherein: The outlet part is arranged on the push rod and moves with the push rod.

3. The fluid switch device according to claim 1 or 2, wherein the device is characterized in that: The pressure member is a spring.

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