Foam shield device

Abstract

The utility model provides a foam shield device. The foam shield device comprises a mixing body, a liquid supply unit, a spray head and a pressure relief assembly, the mixing body is provided with a mixing cavity, and a water inlet, a liquid inlet and a mixed liquid outlet which are communicated with the mixing cavity; the water supply unit is connected with the water inlet and supplies water to the mixing cavity. The liquid supply unit is connected with the liquid inlet and is used for supplying a foaming agent stock solution to the mixing cavity. And the nozzle is provided with a small acceleration hole which is communicated with the mixing cavity through the mixed liquid outlet. The pressure relief assembly is arranged between the small acceleration hole and the mixing cavity and comprises an expansion part, and the expansion part can expand outwards in the process that mixed liquid in the mixing cavity flows into the small acceleration hole so as to increase the volume of a mixed liquid flow channel from the liquid inlet to the small acceleration hole, so that the pressure relief effect on the mixed liquid flow channel is achieved; and the supply duration of the foaming agent stock solution is ensured, so that the amount of sprayed foam is increased, and a good splash-proof effect is achieved.

Description

Technical Field

[0001] The utility model relates to the field of sanitary wares, in particular to a foam shield device. Background Art

[0002] Due to the water seal at the bottom of the toilet, the dirty water in the water seal is likely to splash during toilet use. By covering the surface of the toilet water seal with foam to form a layer of foam shield, the splashing can be effectively inhibited. At the same time, the foam also has the functions of sterilization and odor isolation, and can also play a lubricating role, making it easier for dirt to be discharged from the toilet.

[0003] Existing foam shield devices usually need to use a liquid pump, a gas pump and a reversing valve / solenoid valve for control. The reversing valve / solenoid valve is used to supply water to the foam shield device. The liquid pump extracts the original foaming agent solution from the liquid storage bottle and supplies it into the foam shield device. The gas pump provides gas. Water, the original foaming agent solution and gas are mixed in the foam shield device, and then foam is generated through a foaming net. The foam is discharged into the water seal to form a foam shield on the surface of the water seal.

[0004] Since a liquid pump is required to extract the original foaming agent solution and a gas pump is used to provide gas, the cost of the foam shield device is relatively high. At the same time, it is necessary to occupy the control ports on the main control board of the intelligent cover plate. For this reason, a mechanical diaphragm pump can be formed by using a pressure source (such as water pressure, gas pressure, etc.) and the spring force to drive the diaphragm to reciprocate and deform, and cooperating with an inlet check valve and an outlet check valve. The mechanical diaphragm pump is used to extract and supply the original foaming agent solution, thereby replacing the relatively expensive liquid pump.

[0005] When the foam shield is working, a relatively large internal pressure will be generated inside it. When this internal pressure acts on the mechanical diaphragm pump, it will cause the outlet check valve to close in advance, resulting in a smaller supply volume of the original foaming agent solution, less foam generated by the foam shield, and poor splash-proof effect. Summary of the Utility Model

[0006] In order to solve the above problems, the purpose of the utility model is to provide a foam shield device. By arranging a pressure relief component between the acceleration orifice and the liquid inlet, during the process of the mixed liquid in the mixing chamber flowing into the acceleration orifice, the volume of the mixed liquid flow channel from the liquid inlet to the acceleration orifice is increased, so as to play a role in relieving the pressure of the mixed liquid flow channel and solve the problem of the reduced supply volume of the original foaming agent solution.

[0007] The utility model is realized through the following technical solutions:

[0008] A foam shield device, comprising:

[0009] A mixing body having a mixing chamber, and a water inlet, a liquid inlet and a mixed liquid outlet that are communicated with the mixing chamber;

[0010] A water supply unit connected to the water inlet to supply water to the mixing chamber;

[0011] A liquid supply unit, connected to the liquid inlet, for supplying the foaming agent stock solution to the mixing chamber;

[0012] A spray head, having an acceleration orifice, and the acceleration orifice is connected to the mixing chamber through the mixed liquid outlet;

[0013] It further includes a pressure relief component disposed between the acceleration orifice and the liquid inlet. The pressure relief component includes an expansion part. During the process that the mixed liquid in the mixing chamber flows into the acceleration orifice, the expansion part can expand outwards to increase the volume of the mixed liquid flow path from the liquid inlet to the acceleration orifice.

[0014] Further, a communication port communicating with the mixing chamber is provided on the wall of the mixed liquid flow path; when there is pressure in the mixed liquid flow path, the expansion part moves in a direction away from the communication port to increase the volume of the mixed liquid flow path from the liquid inlet to the acceleration orifice; when the pressure in the mixed liquid flow path disappears, the expansion part moves in a direction close to the communication port to reduce the volume of the mixed liquid flow path from the liquid inlet to the acceleration orifice; the expansion part includes a pressure relief diaphragm or a pressure relief piston, and the pressure relief diaphragm can elastically deform.

[0015] Further, the pressure relief component further includes a fixed cover connected to the wall of the mixed liquid flow path, a return spring with one end disposed on the side of the fixed cover facing the mixed liquid flow path, and a pressure relief protective sleeve covering the other end of the return spring; the pressure relief protective sleeve is used to support the pressure relief diaphragm, and the return spring is used to drive the expansion part to move in a direction close to the communication port when the pressure in the mixed liquid flow path disappears, so as to reduce the volume of the mixed liquid flow path from the liquid inlet to the acceleration orifice.

[0016] Further, the fixed cover is connected to the bottom wall of the mixing chamber, and the periphery of the pressure relief diaphragm is fixed on the bottom wall of the mixing chamber.

[0017] Further, the fixed cover has a guiding bracket disposed around the return spring, the pressure relief protective sleeve has a guiding plate disposed around the return spring, and the end of the guiding plate overlaps with the end of the guiding bracket longitudinally; the fixed cover has a limiting part, and when the expansion part expands outwards in place, the limiting part cooperates with the end of the guiding plate to limit the continuous expansion of the expansion part.

[0018] Further, the fixed cover further has a mounting bracket; the bottom wall of the mixing chamber bulges upwards and bends above the mounting bracket, and the upper end surface of the mounting bracket is in pressing fit with the bottom wall of the mixing chamber for fixing the periphery of the pressure relief diaphragm.

[0019] Further, an upwardly extending flange is provided on the upper end surface of the mounting bracket, and the flange is close to the return spring; a ring-shaped protrusion is provided on the periphery of the pressure relief diaphragm, and the ring-shaped protrusion is sleeved on the outer periphery of the flange.

[0020] Further, waterproof rings are respectively provided on the upper and lower end surfaces of the ring-shaped protrusion.

[0021] Further, the mounting bracket is integrally formed around the outer periphery of the guiding bracket, and the mounting bracket is higher than the guiding bracket.

[0022] Further, the spray head includes a mixing chamber and an air suction channel. The mixing chamber is respectively communicated with the acceleration orifice and the air suction channel, and the air suction channel is communicated with the outside; a foaming net is further provided between the mixing chamber and the spray head outlet.

[0023] Compared with the prior art, the technical solution and its beneficial effects of the present utility model are as follows:

[0024] (1) The pressure relief component of the present utility model is arranged between the acceleration orifice and the liquid inlet. During the process of the mixed liquid in the mixing chamber flowing into the acceleration orifice, the volume of the mixed liquid flow channel from the liquid inlet to the acceleration orifice is increased, so as to play a role in relieving pressure on the mixed liquid flow channel, thereby ensuring the supply duration of the original foaming agent liquid, and further increasing the amount of foam ejected, so as to achieve a good anti-splash effect.

[0025] (2) The pressure relief component of the present utility model includes a fixed cover, a return spring, a pressure relief protective sleeve and a pressure relief diaphragm. By using the deformation of the pressure relief diaphragm to change the volume of the mixing chamber, the purpose of first relieving pressure and then maintaining pressure is achieved, which not only ensures the supply duration of the one-way liquid supply valve, but also ensures the normal operation of the foam shield after the liquid supply ends. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a three-dimensional structure diagram of a foam shield device provided by an embodiment of the present utility model;

[0027] Figure 2 is a sectional view of the foam shield in the initial / stopped state provided by an embodiment of the present utility model;

[0028] Figure 3 is a sectional view of the foam shield in the starting state provided by an embodiment of the present utility model;

[0029] Figure 4 is Figure 2 the enlarged view at A in

[0030] Figure 5 is Figure 3 the enlarged view at B in

[0031] Figure 6It is a three-dimensional structure diagram of the fixed cover provided by the embodiment of the present utility model;

[0032] Figure 7 It is a cross-sectional view of the pressure relief diaphragm provided by the embodiment of the present utility model;

[0033] Figure 8 It is a cross-sectional view of the nozzle provided by the embodiment of the present utility model;

[0034] Figure 9 It is a cross-sectional view of the nozzle from another perspective provided by the embodiment of the present utility model.

[0035] Illustration:

[0036] Mixing body - 100; Liquid storage cavity - 101; Water pump - 102; Liquid outlet check valve - 103; Liquid extraction cavity - 104; Liquid inlet check valve - 105; Pressure holding cavity - 106; Diaphragm - 107; Protective sleeve - 108; First return spring - 109; Mixing cavity - 110; Water inlet - 111; Liquid inlet - 112; Mixed liquid outlet - 113; Pressure holding small hole - 114; Adapter - 115; Mixed liquid outlet pipe - 116;

[0037] Pressure relief assembly - 200; Communication port - 201;

[0038] Fixed cover 210; Guide bracket - 211; Mounting bracket - 212; Flange - 2121;

[0039] Second return spring - 220;

[0040] Pressure relief protective sleeve - 230; Guide plate - 231;

[0041] Pressure relief diaphragm - 240; Ring-shaped protrusion - 241; Waterproof ring - 242;

[0042] Liquid supply unit - 300;

[0043] Nozzle - 400; Acceleration small hole - 401; Suction channel - 402; Mixed liquid inlet - 403; Fusion cavity - 404; Foaming net - 405; Foam outlet channel - 406; Brush ring channel - 407; Main flushing channel - 408; Switching valve - 409. Detailed implementation manners

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0045] Referring to Figures 1 to 3 , a foam shield device includes a mixing body 100, a liquid supply unit 300, a spray head 400, and a pressure relief assembly 200.

[0046] The mixing body has a mixing chamber 110, as well as a water inlet 111, a liquid inlet 112, and a mixed liquid outlet 113 that communicate with the mixing chamber 110. A water supply unit (not shown) is connected to the water inlet 111 to supply water to the mixing chamber 110. The liquid supply unit 300 is connected to the liquid inlet 112 to supply the original foam agent solution to the mixing chamber 110.

[0047] The spray head 400 has an acceleration small hole 401 (please refer to Figure 8 for combination), and the acceleration small hole 401 is connected to the mixing chamber 110 through the mixed liquid outlet 113. The pressure relief assembly 200 is arranged between the acceleration small hole 401 and the liquid inlet 112. The pressure relief assembly 200 includes an expansion part. During the process that the mixed liquid in the mixing chamber 110 flows into the acceleration small hole 401, the expansion part can expand outwards to increase the volume of the mixed liquid flow path from the liquid inlet 112 to the acceleration small hole, so as to relieve the pressure of the mixed liquid flow path, that is, relieve the pressure of the mixing chamber 110.

[0048] A liquid outlet check valve 103 is provided between the liquid supply unit 300 and the mixing chamber 110. When feeding liquid, the liquid drives the liquid outlet check valve 103 to open the liquid inlet 112 to supply the original foam agent solution to the mixing chamber 110. When the liquid feeding stops, the liquid outlet check valve 103 closes the liquid inlet 112.

[0049] Specifically, when the foam shield function is activated, the water pump 102 pumps water from a water tank (not shown) (or the solenoid valve supplies water), and the water flow enters the pressure-holding chamber 106 in the gland from the water inlet 111. Under the action of the pressure-holding small holes 114, a relatively large water pressure is generated in the pressure-holding chamber 106. The water pressure acts on the diaphragm 107, generating a downward force on the diaphragm 107, compressing the first return spring 109 to drive the diaphragm 107 and the protective sleeve 108 to move downward, thereby compressing the volume of the liquid extraction chamber 104, generating a positive pressure in the liquid extraction chamber 104. This positive pressure opens the liquid outlet check valve 103, enabling the foaming agent in the liquid extraction chamber 104 to be supplied to the mixing chamber 110 through the liquid inlet 102. While the water flow drives the diaphragm 107 to act, the water flow passes through the adapter 115 and the mixing chamber body and enters the mixing chamber 110. After the water flow and the foaming agent are fully mixed and diluted in the mixing chamber 110, they flow out from the mixed liquid outlet 113 and then flow to the nozzle 400, and the foam is discharged from the foam outlet channel 406 on the nozzle 400 after being generated. During the process of the mixed liquid in the mixing chamber 110 flowing into the acceleration small hole 401, due to the pressure relief of the pressure relief component 200 on the mixing chamber 110, it is ensured that the liquid outlet check valve 103 opens the liquid inlet 112 for a sufficient long time, thereby providing sufficient undiluted foaming agent, such as Figure 3 , after the liquid supply is completed, the liquid outlet check valve 103 closes the liquid inlet 112.

[0050] After the water pump stops working, the water pressure in the pressure-holding chamber 106 disappears. Under the action of the elastic force of the first return spring 109, the protective sleeve 108 pushes the diaphragm 107 to reset. At this time, the volume of the liquid extraction chamber 104 increases, and a negative pressure is generated in the liquid extraction chamber 104. This negative pressure opens the liquid inlet check valve 105, and the foaming agent in the liquid storage chamber 101 is sucked into the liquid extraction chamber 104, preparing for supplying the foaming agent to the mixing chamber 110 when the foam shield function is started next time.

[0051] When the pressure relief component 500 is not installed, due to the acceleration small hole 401 on the nozzle 400, a relatively large internal pressure will be formed in the mixing chamber 110. This internal pressure will act on the liquid outlet check valve 103 to close it in advance. At this time, the diaphragm 107 has not been driven in place, resulting in a small supply amount of the foaming agent.

[0052] Refer to Figures 4 to 7 , a communication port 201 communicating with the mixing chamber 110 is provided on the wall of the mixed liquid flow channel. When there is pressure in the mixed liquid flow channel, the expansion part moves away from the communication port 201 to increase the volume of the mixed liquid flow channel from the liquid inlet 112 to the acceleration small hole 401, thereby playing a role in relieving the pressure of the mixing chamber 110. When the pressure in the mixed liquid flow channel disappears, the expansion part moves towards the communication port 201 to reduce the volume of the mixed liquid flow channel from the liquid inlet 112 to the acceleration small hole 401, preparing for the next pressure relief.

[0053] In this embodiment, the expansion part includes a pressure relief diaphragm 240 with the ability of elastic deformation. In other embodiments, the expansion part can also be a pressure relief piston. The pressure relief assembly 200 further includes a fixed cover 210 connected to the wall of the mixed liquid flow channel, a second return spring 220 with one end disposed on the side of the fixed cover 210 facing the mixed liquid flow channel, a pressure relief protection sleeve 230 covering the other end of the second return spring 220, and a pressure relief diaphragm 240 covering the side of the pressure relief protection sleeve 230 facing away from the second return spring 220. The pressure relief protection sleeve 230 is used to support the pressure relief diaphragm 240, and the second return spring 220 is used to drive the expansion part to move towards the direction close to the communication port 201 when the pressure in the mixed liquid flow channel disappears, so as to reduce the volume of the mixed liquid flow channel from the liquid inlet 112 to the acceleration small hole 401. The pressure relief diaphragm 240 is in contact with the mixed liquid flow channel through the communication port 201. In this embodiment, the fixed cover 210 is connected to the bottom wall of the mixing chamber 110, that is, the pressure relief assembly 200 is disposed at the bottom of the mixing chamber 110, and the periphery of the pressure relief diaphragm 230 is fixed to the bottom wall of the mixing chamber.

[0054] When the foam shield is in the initial or stopped working state, there is no pressure in the mixing chamber 110. At this time, the pressure relief diaphragm 240 is in an upward convex state under the action of the pressure relief protection sleeve 230 and the second return spring 220, and the volume of the mixing chamber 110 is the smallest at this time. When the foam shield function is turned on, a certain pressure (including water pressure or air pressure) is formed in the mixing chamber 110. Under the action of this pressure, the pressure relief diaphragm 240 begins to concave downward, driving the pressure relief protection sleeve 230 to move downward and compressing the second return spring 220. At this time, the volume of the mixing chamber 110 gradually increases. During this process, the pressure value in the mixing chamber basically maintains at the B value. When the pressure relief protection sleeve 230 moves downward to the limit, the pressure relief diaphragm 240 can no longer concave downward. At this time, the volume of the mixing chamber 110 reaches the maximum, and the pressure in the chamber will also quickly increase to the maximum value A, where A > B. The deformation of the pressure relief diaphragm 240 is used to change the volume of the mixing chamber 110, so as to achieve the purpose of first relieving pressure and then maintaining pressure. The limit of the downward movement of the pressure relief protection sleeve 230 can be the limit formed by the structure between the pressure relief protection sleeve 230 and the fixed cover 210, or the balance point formed by the combined action of the compression elastic force of the second return spring 220 and the pressure in the mixing chamber 110.

[0055] In this embodiment, the fixed cover 210 has a guide bracket 211 arranged around the second return spring 220, and the pressure relief protective sleeve 230 has a guide plate 231 arranged around the second return spring 220. The end of the guide plate 231 overlaps with the end of the guide bracket 211 in the longitudinal direction, so that the guide bracket 211 and the axial hole of the guide plate 231 are matched. It can be understood that there is a clearance fit between the two, so that the guide plate 231 can move along the inner wall or outer wall of the guide bracket 211, thereby playing a guiding role when compressing the second return spring 220. In this embodiment, the fixed cover 210 has a limiting portion. When the expansion portion expands outward to a certain position, the limiting portion cooperates with the end of the guide plate 231 to limit the expansion portion from continuing to expand.

[0056] Furthermore, the fixed cover 210 also has a mounting bracket 212, which is arranged around the outer periphery of the guide bracket 211; the bottom wall of the mixing chamber 110 bulges upward and bends to the top of the mounting bracket 212, and the upper end surface of the mounting bracket 212 is pressed against the bottom wall of the mixing chamber 110 to fix the periphery of the pressure relief diaphragm 240. In this embodiment, the mounting bracket 212 and the guide bracket 211 are integrally formed, and the mounting bracket 212 is higher than the guide bracket 211, so that a clearance cavity is formed between the mounting bracket 212 and the guide plate 231 to accommodate the deformation of the pressure relief diaphragm 240.

[0057] The upper end surface of the mounting bracket 212 is provided with a flange 2121 extending upward, the flange 2121 is close to the second return spring 220, and the periphery of the pressure relief diaphragm 240 is provided with an annular protrusion 241 for sleeved on the outer periphery of the flange 2121. That is, a mounting groove is formed between the upper end surface of the mounting bracket 212 and the bottom wall of the mixing chamber 110, and the annular protrusion 241 of the pressure relief diaphragm 240 is clamped in the mounting groove, so that the pressure relief diaphragm 240 is more fixed. Preferably, the upper and lower end surfaces of the annular protrusion 241 are also provided with waterproof rings 242 respectively to prevent the mixed liquid from flowing into the cavity formed by the pressure relief diaphragm 240 and the fixing cover 210.

[0058] participate Figure 8 and Figure 9, the nozzle 400 includes a mixing chamber 404 and a suction passage 402. The mixing chamber 404 is respectively connected to the acceleration orifice 401 and the suction passage 402, and the suction passage 402 is connected to the outside; a bubble net 405 is further provided between the mixing chamber 404 and the nozzle outlet. The mixed liquid flows from the mixed liquid outlet 113 to the mixed liquid inlet 403 through a pipeline. The mixed liquid mixed with the foaming agent ejects a high-speed water flow after passing through the acceleration orifice 401, generating a Venturi effect in the mixing chamber 404 to form a negative pressure. The negative pressure sucks in air (sucking air from the outside through the suction passage), and the air is mixed with the mixed liquid mixed with the foaming agent. After passing through the bubble net, foam is generated, and the foam is ejected from the foam outlet passage 406 to the water seal surface to form a foam shield. In this embodiment, the nozzle includes a brush ring nozzle and a main flush nozzle. The brush ring nozzle includes a foam outlet passage 406 and a brush ring passage 407 that are not connected to each other. The main flush nozzle includes a main flush passage 408. The brush ring passage 407 and the main flush passage 408 are controlled to switch through a switching valve 409 to form a flushing water path.

[0059] For the foam shield device of this embodiment, by adding a pressure relief component 200 at the bottom of the mixing chamber 110, when the foam shield starts to work, the volume of the mixing chamber 110 is expanded to reduce the pressure in the mixing chamber 110, thereby prolonging the liquid discharge time of the liquid discharge check valve 103, ensuring that the supply amount of the foaming agent is sufficient to form enough foam to prevent splashing. After the liquid supply action of the liquid discharge check valve 103 is completed, the second return spring 220 of the pressure relief component 200 remains in a stable compressed state, and the pressure in the mixing chamber 110 rises and maintains stability. At this time, the foam shield device can re-form the internal pressure required for work, thereby ensuring the normal function of the foam shield. By using the deformation of the pressure relief diaphragm 240 to change the volume of the mixing chamber 100, the purpose of first relieving pressure and then maintaining pressure is achieved. The structure of the present invention is simple, the cost is low, and the function is reliable.

[0060] In addition, the pressure relief component 200 provided in the mixing chamber 110 also has the function of preventing freezing and cracking. When the liquid in the mixing chamber 110 freezes under low temperature conditions, it can push the pressure relief diaphragm 240 to expand the volume of the mixing chamber 110, thereby accommodating the volume expansion caused by freezing and preventing the shell of the mixing chamber 110 from bursting.

[0061] The above description shows and describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the inventive concept of the present invention through the above teachings or the technology or knowledge in related fields. And the modifications and changes made by those skilled in the art without departing from the spirit and scope of the present invention should all be within the protection scope of the appended claims of the present invention.

Claims

1. A foam shield device, comprising: A mixing body, comprising a mixing chamber, and a water inlet, a liquid inlet and a mixed liquid outlet communicated with the mixing chamber; a water supply unit connected to the water inlet and supplying water to the mixing chamber; A liquid supply unit connected to the liquid inlet for supplying a foaming agent stock solution to the mixing chamber; A nozzle having an accelerating orifice, wherein the accelerating orifice is connected to the mixing chamber through the mixed liquid outlet; It is characterized in that it also includes a pressure relief component arranged between the acceleration hole and the liquid inlet, and the pressure relief component includes an expansion part. When the mixed liquid in the mixing chamber flows into the acceleration hole, the expansion part can expand outward to increase the volume of the mixed liquid flow channel from the liquid inlet to the acceleration hole.

2. A foam shield device according to claim 1, characterized in that: A connecting port connected to the mixing chamber is provided on the wall of the mixed liquid flow channel; when there is pressure in the mixed liquid flow channel, the expansion part moves in a direction away from the connecting port to increase the volume of the mixed liquid flow channel from the liquid inlet to the acceleration hole; when the pressure in the mixed liquid flow channel disappears, the expansion part moves in a direction close to the connecting port to reduce the volume of the mixed liquid flow channel from the liquid inlet to the acceleration hole; the expansion part includes a pressure relief diaphragm or a pressure relief piston, and the pressure relief diaphragm can be elastically deformed.

3. A foam shield device according to claim 2, characterized in that: The pressure relief assembly also includes a fixed cover connected to the wall of the mixed liquid flow channel, a return spring with one end arranged on the fixed cover facing the mixed liquid flow channel, and a pressure relief protection sleeve covering the other end of the return spring; the pressure relief protection sleeve is used to support the pressure relief diaphragm, and the return spring is used to drive the expansion part to move toward the connecting port when the pressure in the mixed liquid flow channel disappears, so as to reduce the volume of the mixed liquid flow channel from the liquid inlet to the acceleration hole.

4. A foam shield device according to claim 3, characterized in that: The fixed cover is connected to the bottom wall of the mixing chamber, and fixes the periphery of the pressure relief diaphragm on the bottom wall of the mixing chamber.

5. A foam shield device according to claim 3, characterized in that: The fixed cover has a guide bracket arranged around the reset spring, and the pressure relief protection sleeve has a guide plate arranged around the reset spring, and the end of the guide plate overlaps with the end of the guide bracket in the longitudinal direction; the fixed cover has a limiting portion, and when the expansion portion expands outward to a certain position, the limiting portion cooperates with the end of the guide plate to limit the expansion portion from continuing to expand.

6. A foam shield device according to claim 5, characterized in that: The fixed cover also has a mounting bracket; the bottom wall of the mixing chamber protrudes upward and is bent to the top of the mounting bracket, and the upper end surface of the mounting bracket is pressed and matched with the bottom wall of the mixing chamber to fix the periphery of the pressure relief diaphragm.

7. A foam shield device according to claim 6, characterized in that: The upper end surface of the mounting bracket is provided with a flange extending upward, and the flange is close to the reset spring; the periphery of the pressure relief diaphragm is provided with an annular protrusion, and the annular protrusion is sleeved on the outer periphery of the flange.

8. A foam shield device according to claim 7, characterized in that: The upper and lower end surfaces of the annular protrusion are also provided with waterproof rings respectively.

9. A foam shield device according to claim 6, characterized in that: The mounting bracket is integrally formed around the outer circumference of the guide bracket, and the mounting bracket is higher than the guide bracket.

10. A foam shield device according to claim 1, characterized in that: The nozzle comprises a fusion cavity and an air suction channel, wherein the fusion cavity is respectively connected with the acceleration hole and the air suction channel, and the air suction channel is connected with the outside; a bubbling net is also arranged between the fusion cavity and the nozzle outlet.

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