Switch assembly and water purification equipment

Abstract

The utility model discloses a switch assembly and water purification equipment, the switch assembly comprises a mounting seat, a one-way valve, a gland structure and a water pressure sensor arranged on the mounting seat, the mounting seat is provided with a first flow channel, a first cavity and a second flow channel which are communicated in sequence, the inner wall surface of the first cavity comprises a first side wall surface and a first end wall surface, the first end wall face is located between the first side wall face and the inner wall face of the first flow channel and connected with the first side wall face and the inner wall face of the first flow channel. The one-way valve and the gland structure are arranged in the first cavity, a first connector of the one-way valve communicates with the first flow channel, a second connector of the one-way valve communicates with the second flow channel, the opening wall of the first connector makes contact with the first end wall face, and the opening wall of the second connector abuts against the gland structure. According to the switch assembly, the one-way valve and the water pressure sensor are integrated, the gland structure and the first end wall face can jointly limit the one-way valve in the first cavity, and the one-way valve is prevented from moving in the first cavity.

Description

Technical Field

[0001] The utility model relates to the technical field of water purifiers, in particular to a switch assembly and a water purification device. Background Art

[0002] A water purification device, also known as a water purifier or water quality purifier, is a water treatment device that deeply filters and purifies water quality according to the usage requirements of water. With the improvement of living standards, people's requirements for the water quality of water used are getting higher and higher, and water purification devices have been widely used.

[0003] In the related art, the internal water circuit of the water purification device is relatively complex. In order to solve the problem of frequent startup of the water purification device, a variety of switches and valves need to be installed in series in the water circuit, which is likely to cause complex assembly and occupy the internal space of the machine, and is not conducive to the miniaturization of the whole machine. Summary of the Utility Model

[0004] An embodiment of the utility model provides a switch assembly and a water purification device, which can integrate the switch assembly and the one-way valve into one body, thereby reducing the occupied volume of the switch assembly.

[0005] In a first aspect, an embodiment of the utility model provides a switch assembly, including:

[0006] A first flow channel, a first cavity and a second flow channel. The first flow channel has a water inlet, the second flow channel has a water outlet. The inner wall surface of the first cavity includes a first side wall surface and a first end wall surface. The first end wall surface is located between the first side wall surface and the inner wall surface of the first flow channel, and is respectively connected to the first side wall surface and the inner wall surface of the first flow channel;

[0007] A one-way valve is arranged in the first cavity. The one-way valve has a first interface and a second interface. The first interface is communicated with the water inlet, and the wall of the first interface is in contact with the first end wall surface. The second interface is communicated with the second flow channel. The one-way valve is used to control the one-way flow of fluid from the water inlet to the second flow channel;

[0008] A gland structure is arranged in the first cavity, and the gland structure abuts against the wall of the second interface to fix the one-way valve;

[0009] A water pressure sensor is arranged on the mounting seat. The water pressure sensor is used to detect the water pressure value in the second flow channel.

[0010] In some embodiments, the gland structure includes a cover body and a limiting portion. The cover body is located on the side of the one-way valve away from the first end wall surface, and the cover body is connected to the mounting seat; the limiting portion is connected to the cover body, and the limiting portion is located between the cover body and the one-way valve, and the limiting portion abuts against the wall of the second interface.

[0011] In some embodiments, the limiting portion includes a plurality of limiting bosses. The plurality of limiting bosses are arranged at intervals along the circumferential direction of the cover body to form the conduction channel, and the limiting bosses are in contact with the wall of the second interface; alternatively, the limiting portion includes an annular column, and the end of the annular column has an annular first opening, and the wall of the first opening is in contact with the wall of the second interface.

[0012] In some embodiments, an installation groove is formed on the circumferential side of the cover body, a sealing member is arranged in the installation groove, and the sealing member abuts against the first side wall surface.

[0013] In some embodiments, the mounting seat further has a third flow channel, and the third flow channel communicates the first cavity with the second flow channel; wherein, the mounting seat further has a receiving cavity communicated with the third flow channel, and the water pressure sensor is located in the receiving cavity.

[0014] In some embodiments, the third flow channel has a first communication port, a second communication port, and a third communication port arranged in sequence along the extending direction of the third flow channel. The first cavity is communicated with the first communication port, the second flow channel is communicated with the second communication port, and the receiving cavity is communicated with the third communication port.

[0015] In some embodiments, the water pressure sensor includes at least one of a reed type water pressure switch and a micro motion type water pressure switch.

[0016] The axial direction of the water inlet is parallel to the axial direction of the water outlet, and the axial direction of the water inlet is perpendicular to the extending direction of the first flow channel.

[0017] In a second aspect, an embodiment of the present invention further provides a water purification device, including a water purification pipeline, a controller, and the switch assembly as described in any one of the above embodiments. The switch assembly and the controller are both arranged on the water purification pipeline. The water pressure sensor is electrically connected to the controller, and the controller is used to control the on-off of the switch assembly according to the water pressure value detected by the water pressure sensor.

[0018] Based on the switch assembly and water purification equipment in the present utility model, in this embodiment, a one-way valve is arranged in the first cavity. On the basis of preventing water from flowing backward, the one-way valve and the water pressure sensor can be integrated into one body to reduce the occupied volume of the switch assembly, and it is convenient for the switch assembly to be applied to a narrow installation space. At the same time, a gland structure is also arranged in the first cavity, so that the gland structure and the first end wall surface can act together to limit the one-way valve in the first cavity and prevent the one-way valve from displacing in the first cavity during the process of admitting water or blocking water. Since the switch assembly in this embodiment is integrated with a one-way valve and a water pressure sensor, the number of pipeline joints is effectively reduced, the leakage points of the equipment are correspondingly reduced, and the integrated connection between the water pressure sensor and the one-way valve is safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 Structural schematic diagram of the switch assembly in an embodiment;

[0021] Figure 2 Cross-sectional structural schematic diagram of the switch assembly in an embodiment;

[0022] Figure 3 For Figure 2 Enlarged structural schematic diagram of part A in

[0023] Figure 4 Structural schematic diagram of the gland structure in an embodiment;

[0024] Figure 5 Structural schematic diagram of the gland structure in another embodiment.

[0025] Reference numerals:

[0026] 1. Switch assembly;

[0027] 10. Mounting seat; 11. First flow channel; 111. Water inlet; 12. First cavity; 121. First side wall surface; 122. First end wall surface; 13. Second flow channel; 131. Water outlet; 14. Third flow channel; 141. First communication port; 142. Second communication port; 143. Third communication port; 15. Electrical connection terminal; 16. Accommodation cavity;

[0028] 20. One-way valve; 21. First interface; 22. Second interface; 23. Housing; 231. First end; 232. Second end; 24. One-way valve core; 25. Reset part;

[0029] 30. Gland structure; 31. Cover body; 311. Installation groove; 32. Limiting part; 321. First opening; 322. Conducting channel; 324. Limiting rod; 325. Annular column;

[0030] 40. Water pressure sensor. Specific implementation manner

[0031] In order to more clearly illustrate the technical solutions in the present invention or related technologies, the following will be clearly and completely described in conjunction with the drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

[0032] In related technologies, in order to solve the problem of frequent startup of the water purifier, a one-way valve needs to be installed in series at the front end of the flow path of the water pressure sensor to maintain the power-off pressure of the water pressure sensor. However, a switch and a valve need to be installed in series in the water path, and components such as a water path that communicates with each other and a water path joint need to be provided, which will result in a large number of internal components of the water purifier and a large structural occupied space.

[0033] In view of the above situation, in the first aspect, please refer to Figures 1-3 , the present invention proposes a switch assembly 1, which includes a mounting seat 10, a one-way valve 20, a gland structure 30, and a water pressure sensor 40.

[0034] The mounting seat 10 has a first flow channel 11, a first cavity 12, and a second flow channel 13 that are sequentially connected. The first flow channel 11 has a water inlet 111, and the second flow channel 13 has a water outlet 131. That is, after the external fluid enters the switch assembly 1 from the water inlet 111, it can flow to the first flow channel 11, the first cavity 12, and the second flow channel 13 in sequence, and finally flow out from the water outlet 131.

[0035] The water pressure sensor 40 is arranged on the mounting seat 10. The water pressure sensor 40 is used to detect the water pressure value in the second flow channel 13 and transmit the detected water pressure value to an external controller.

[0036] The one-way valve 20 and the gland structure 30 are both arranged in the first cavity 12, and the first cavity 12 provides a setting space and an installation foundation for the one-way valve 20 and the gland structure 30. The one-way valve 20 is located between the first flow channel 11 and the gland structure 30. The one-way valve 20 has a first interface 21 and a second interface 22. The first interface 21 is communicated with the water inlet 111, and the second interface 22 is communicated with the second flow channel 13. The one-way valve 20 is used to control the one-way flow of the fluid from the water inlet 111 to the second flow channel 13, that is, the one-way valve 20 can make the fluid flowing in from the water inlet 111 of the switch assembly 1 only flow from the first flow channel 11 to the second flow channel 13, thereby preventing the water flowing out from the second flow channel 13 from flowing back into the first flow channel 11.

[0037] Among them, as Figure 3 shown, the inner wall surface of the first cavity 12 includes a first side wall surface 121 and a first end wall surface 122. The first end wall surface 122 is located between the first side wall surface 121 and the inner wall surface of the first flow channel 11, and is respectively connected to the first side wall surface 121 and the inner wall surface of the first flow channel 11. The wall of the first interface 21 on the one-way valve 20 contacts the first end wall surface 122. The first end wall surface 122 can provide support for the wall of the first interface 21 on the one-way valve 20, and prevent the one-way valve 20 from displacing during the process of the water inlet 111 filling water into the first cavity 12; the gland structure 30 abuts against the wall of the second interface 22 to fix the one-way valve 20, that is, the gland structure 30 can provide support for the wall of the second interface 22 on the one-way valve 20, and prevent the one-way valve 20 from displacing when the water pressure at the first cavity 12 and the second flow channel 13 increases. At the same time, the periphery of the one-way valve 20 can be in contact with the first side wall surface 121, that is to say, the first side wall surface 121 surrounds the periphery of the one-way valve 20 to limit the position of the one-way valve 20, thereby preventing the one-way valve 20 from shifting in position; alternatively, a rubber ring can be arranged on the periphery of the one-way valve 20, and the rubber ring abuts against the first side wall surface 121, which not only improves the sealing performance between the one-way valve 20 and the first side wall surface 121, but also increases the friction between the one-way valve 20 and the first side wall surface 121, making the setting of the one-way valve 20 more firm.

[0038] It should be noted that in this embodiment, by arranging a check valve 20 in the first cavity 12, on the basis of preventing the reverse flow of water, the check valve 20 and the water pressure sensor 40 can be integrated together, so as to reduce the occupied volume of the switch assembly 1 and facilitate the switch assembly 1 to be applicable to a narrow installation space. At the same time, a gland structure 30 is also arranged in the first cavity 12, so that the gland structure 30 and the first end wall surface 122 can act together to limit the check valve 20 in the first cavity 12 and prevent the check valve 20 from displacing in the first cavity 12 during the process of admitting water or blocking water. Since the switch assembly 1 in this embodiment integrates the check valve 20 and the water pressure sensor 40 by itself, the number of pipeline joints is effectively reduced, the water leakage points of the equipment are correspondingly reduced, and the integrated connection between the water pressure sensor 40 and the check valve 20 is safer and more reliable.

[0039] It should also be noted that a power connection terminal 15 is arranged on the mounting seat 10. The power connection terminal 15 is electrically connected to the water pressure sensor 40 and an external controller. The water pressure sensor 40 can detect the water pressure value in the second flow channel 13. The water pressure sensor 40 is connected to the external controller through the power connection terminal 15 to transmit the water pressure signal to the controller, so that the external controller can control the on-off of the switch assembly 1. Exemplarily, when the water pressure value in the second flow channel 13 is lower than the preset connection value, the water pressure sensor 40 transmits the detected first water pressure signal to the controller, so that the external controller conducts the water inlet 111, and the water inlet 111 can admit fluid; when the water pressure value in the second flow channel 13 is higher than the preset disconnection value, the detected second water pressure signal is transmitted to the controller, so that the external controller closes the water inlet 111, making the water inlet 111 unable to continue admitting fluid.

[0040] In some embodiments, the water pressure sensor 40 includes at least one of a reed type water pressure switch and a micro motion type water pressure switch. Taking the water pressure sensor 40 including a micro motion type water pressure switch as an example, when the fluid in the second flow channel 13 reaches the preset value, the micro motion type water pressure switch can be triggered, and the micro motion type water pressure switch can transmit an electrical signal to an external controller, such as the control circuit board of a water purifier, so as to control the corresponding actions of the water purifier.

[0041] In some embodiments, as Figure 3 shown, the check valve 20 includes a housing 23, a check valve core 24 and a reset member 25. The periphery of the housing 23 is connected to the first side wall surface 121. Exemplarily, the first side wall surface 121 surrounds the periphery of the housing 23 to limit the position of the housing 23, thereby preventing the housing 23 from shifting in position.

[0042] The one-way valve core 24 is arranged in the housing 23. The one-way valve core 24 can move axially along the first flow channel 11 relative to the housing 23 so that the one-way valve core 24 can be switched between a first position and a second position. When fluid enters the switch assembly 1 from the water inlet 111, the water pressure of the fluid pushes the one-way valve core 24 to move, so that the one-way valve core 24 moves to the second position. At this time, the water inlet 111 is communicated in the direction towards the first cavity 12, that is, it is unidirectionally communicated between the water inlet 111 and the first cavity 12, so that the fluid entering from the water inlet 111 can flow through the one-way valve 20 and reach the second flow channel 13. When the fluid flows from the second flow channel 13 towards the water inlet 111, the water pressure drives the one-way valve core 24 to move to the first position. At this time, the second flow channel 13 is cut off from the water inlet 111, so that the water in the second flow channel 13 cannot flow reversely.

[0043] One end of the reset member 25 is connected to the housing 23, and the other end of the reset member 25 is connected to the one-way valve core 24. After water flows from the water inlet 111 to the second flow channel 13, if there is no subsequent water flow continuing to flow into the reservoir, the reset member 25 will reset the one-way valve core 24 from the second position to the first position, thereby cutting off the water inlet 111 and the second flow channel 13 to prevent the fluid in the second flow channel 13 from flowing reversely.

[0044] Along the axial direction of the first flow channel 11, the housing 23 has a relatively arranged first end 231 and a second end 232. The first end 231 contacts the first end wall surface 122, and the second end 232 abuts against the gland structure 30. The first end wall surface 122 and the gland structure 30 fix and limit the housing 23 of the one-way valve 20 in a certain position, thereby preventing the one-way valve 20 from displacing during the process of admitting water or blocking water, and thus making the installation of the one-way valve 20 more stable.

[0045] Please refer to Figure 2 , in some embodiments of the present application, the mounting seat further has a third flow channel 14, and the third flow channel 14 communicates the first cavity 12 and the second flow channel 13; wherein, the mounting seat 10 further has a receiving cavity 16 communicated with the third flow channel 14, and the water pressure sensor 40 is located in the receiving cavity 16, so that the water pressure sensor 40 can detect the water pressure value in the third flow channel 14.

[0046] Please continue to refer to Figure 2, in some embodiments of the present application, the third flow channel 14 has a first communication port 141, a second communication port 142, and a third communication port 143 arranged in sequence along the extension direction of the third flow channel 14. The first cavity 12 communicates with the first communication port 141, the second flow channel 13 communicates with the second communication port 142, and the accommodation cavity 16 communicates with the third communication port 143. It can be understood that the accommodation cavity 16 provides an installation base and a setting space for the water pressure sensor 40. The water flow entering from the water inlet 111 can flow through the first flow channel 11, the one-way valve 20, the first communication port 141, the third flow channel 14, the second communication port 142, the second flow channel 13 in sequence, and finally flow out through the water outlet 131. The accommodation cavity 16 communicates with the third communication port 143, and the water pressure sensor 40 is located in the accommodation cavity 16. Therefore, the water pressure sensor 40 can detect the water pressure value in the third flow channel 14, and the setting of the water pressure sensor 40 does not hinder the flow of water in the switch assembly.

[0047] As Figure 2 shown, in some embodiments, the axial direction of the first flow channel 11 is parallel to the axial direction of the second flow channel 13, so as to facilitate the connection of the water inlet 111 and the water outlet 131 to the water channel structure inside the mounting base 10 at the same time. Alternatively, in some other embodiments, the axial direction of the first flow channel 11 and the axial direction of the second flow channel 13 may also form an included angle. The axial direction of the first flow channel 11 is perpendicular to the extension direction of the second flow channel 13, and the axial direction of the first flow channel 11 is also perpendicular to the extension direction of the third flow channel 14. As a result, the distances from the water inlet 111 and the water outlet 131 to the third flow channel 14 are the same, which is beneficial to the connection between the water inlet 111 and the water outlet 131 and the third flow channel 14.

[0048] Specifically, the first cavity 12 extends along the axial direction of the first flow channel 11. Therefore, the extension direction of the first cavity 12 is perpendicular to the extension direction of the third flow channel 14. The one-way valve 20 is located between the first communication port 141 and the first flow channel 11. Among them, the first cavity 12 can extend along the axial direction of the first flow channel 11 and penetrate through the mounting base 10 to provide installation and movement space for the one-way valve 20. One through port of the first cavity 12 communicates with the first flow channel 11, and the other through port of the first cavity 12 is closed by the gland structure 30. That is, the gland structure 30 can form a closed water outlet cavity at the second interface 22 of the one-way valve 20, so that the water flow can flow from the second interface 22 of the one-way valve 20 to the second flow channel 13. At the same time, in this embodiment, the one-way valve 20 located in the first cavity 12 can be installed or replaced by disassembling and assembling the gland structure 30, which also makes the installation of the one-way valve 20 more convenient.

[0049] Please refer to Figures 2-4, in some embodiments of the present application, the gland structure 30 includes a cover body 31 and a limiting portion 32. The cover body 31 is located on the side of the one-way valve 20 away from the first end wall surface 122, and the cover body 31 and the mounting seat 10 can be detachably connected. It can not only close a through port between the first cavity 12 and the outside, but also facilitate the disassembly of the cover body 31 and the installation of the one-way valve 20.

[0050] The limiting portion 32 is connected to the cover body 31, and the limiting portion 32 is located on the side of the cover body 31 close to the one-way valve 20. The limiting portion 32 abuts against the wall of the second interface 22. It can be understood that the one-way valve 20 is arranged between the limiting portion 32 and the first end wall surface 122. The limiting portion 32 and the first end wall surface 122 jointly limit the one-way valve 20, so that the installation and operation of the one-way valve 20 are more stable.

[0051] In some embodiments of the present application, as Figure 5 shown, the limiting portion 32 has a first opening 321, a conduction channel 322 and a second opening (not shown in the figure) that are sequentially connected. The first opening 321 is connected to the second interface 22, and the second opening is connected to the second flow channel 13. When water flows in from the water inlet 111 and passes through the one-way valve 20, it can flow through the first opening 321, the conduction channel 322 and the second opening in sequence and then enter the second flow channel 13, so as to avoid the setting of the limiting portion 32 from hindering the water flow from the one-way valve 20 to the second flow channel 13.

[0052] Furthermore, please refer to Figure 4 , the limiting portion 32 may include a plurality of limiting bosses 321. The plurality of limiting bosses 321 are arranged at intervals along the circumferential direction of the cover body 31 to form a conduction channel 322. The end of the limiting boss 321 contacts the wall of the second interface 22. The setting of the limiting boss 321 is more convenient and simple, which is convenient for production and manufacturing. At the same time, the fluid entering the conduction channel 322 from the one-way valve 20 still needs to flow to the second flow channel 13. The limiting boss 321 has less obstruction to the fluid in the first cavity 12, so as to ensure that the fluid smoothly flows from the first cavity 12 to the second flow channel 13.

[0053] Or, please refer to Figure 5, the limiting portion 32 may further include an annular column 322. The end of the annular column 322 has an annular first opening 321, and the wall of the first opening 321 contacts the wall of the second interface 22. Specifically, the first opening 321 is annular, and the annular wall of the first opening 321 contacts the one-way valve 20, thereby increasing the contact area between the annular column 322 and the one-way valve 20, so that the force exerted by the annular column 322 on the one-way valve 20 is more balanced, and further providing a stable limiting effect on the one-way valve 20. Wherein, the annular column 322 is hollow, that is, the hollow cavity of the annular column 322 forms a conduction channel 322 to provide a flow path for the fluid in the first cavity 12, so that the fluid entering the first cavity 12 from the one-way valve 20 can flow from the conduction channel 322 to the second flow channel 13.

[0054] Further, please refer to Figures 4-5 , in some embodiments of the present application, an installation groove 311 is provided on the circumferential side of the cover body 31. A seal is provided in the installation groove 311, and the seal abuts against the first side wall surface 121. The installation groove 311 can provide an installation space and limit for the seal, and the seal can improve the sealing performance between the cover body 31 and the first side wall surface 121. Among them, the seal can be a rubber ring.

[0055] In a second aspect, the present utility model further provides a water purification device, including a water purification pipeline, a controller, and the switch assembly 1 as described in any of the above embodiments. The switch assembly 1 and the controller are both arranged on the water purification pipeline. The water pressure sensor 40 is electrically connected to the controller through the power connection terminal 15 on the mounting seat 10. The controller is used to control the on-off of the switch assembly 1 according to the water pressure value detected by the water pressure sensor 40.

[0056] Exemplarily, the water purification device further includes a water storage bucket for storing water. The external water pipe is communicated with the water inlet 111 of the switch assembly 1, and the external water pipe discharges water into the water storage bucket through the water inlet 111 of the switch assembly 1. When the water storage volume of the water storage bucket exceeds a predetermined value, the water pressure sensor 40 can measure that the water pressure value in the second flow channel 13 is higher than the preset disconnection value, and thus send a water pressure signal to the controller in the water purification pipeline. The controller can control the water inlet 111 to stop supplying water according to the water pressure signal.

[0057] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and should not be construed as a limitation to the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0058] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A switch assembly, characterized in that: include: The mounting seat comprises a first flow channel, a first cavity and a second flow channel which are connected in sequence, the first flow channel has a water inlet, the second flow channel has a water outlet, the inner wall surface of the first cavity comprises a first side wall surface and a first end wall surface, the first end wall surface is located between the first side wall surface and the inner wall surface of the first flow channel, and is respectively connected to the first side wall surface and the inner wall surface of the first flow channel; a one-way valve, disposed in the first cavity, the one-way valve having a first interface and a second interface, the first interface being communicated with the water inlet, and the mouth wall of the first interface being in contact with the first end wall surface, the second interface being communicated with the second flow channel, the one-way valve being used to control the one-way flow of the fluid from the water inlet to the second flow channel; A gland structure is disposed in the first cavity, and the gland structure abuts against the wall of the second interface to fix the one-way valve; A water pressure sensor is arranged on the mounting seat, and the water pressure sensor is used to detect the water pressure value in the second flow channel.

2. The switch assembly according to claim 1, characterized in that The gland structure comprises: A cover body, located on a side of the one-way valve away from the first end wall, and the cover body is connected to the mounting seat; The limiting part is connected to the cover body, and the limiting part is located between the cover body and the one-way valve, and the limiting part abuts against the mouth wall of the second interface.

3. The switch assembly according to claim 2, characterized in that: The limiting portion has a first opening, a conducting channel, and a second opening that are connected in sequence. The first opening is connected to the second interface, and the second opening is connected to the second flow channel.

4. The switch assembly according to claim 3, characterized in that: The limiting portion includes a plurality of limiting bosses, which are arranged at intervals along the circumference of the cover body to form the conducting channel, and the limiting bosses are in contact with the mouth wall of the second interface; or, The limiting portion includes an annular column, the end of the annular column has the first annular opening, and the opening wall of the first opening contacts the opening wall of the second interface.

5. The switch assembly according to claim 2, characterized in that: A mounting groove is formed on the peripheral side of the cover body, a sealing member is arranged in the mounting groove, and the sealing member abuts against the first side wall surface.

6. The switch assembly according to claim 1, characterized in that The mounting seat further has a third flow channel, and the third flow channel connects the first cavity and the second flow channel; Wherein, the mounting seat further has a containing cavity communicated with the third flow channel, and the water pressure sensor is located in the containing cavity.

7. The switch assembly according to claim 6, characterized in that The third flow channel has a first connecting port, a second connecting port and a third connecting port arranged in sequence along the extension direction of the third flow channel, the first cavity is connected to the first connecting port, the second flow channel is connected to the second connecting port, and the accommodating cavity is connected to the third connecting port.

8. The switch assembly according to claim 6, characterized in that The axial direction of the first flow channel is arranged in parallel with the axial direction of the second flow channel, and the axial direction of the first flow channel is arranged perpendicular to the extending direction of the third flow channel.

9. The switch assembly according to claim 1, characterized in that The water pressure sensor includes at least one of a reed type water pressure switch and a micro-type water pressure switch.

10. A water purification device, characterized in that: It comprises a water purification pipeline, a controller and a switch assembly as described in any one of claims 9, wherein the switch assembly is arranged in the water purification pipeline, the water pressure sensor is electrically connected to the controller, and the controller is used to control the on and off of the switch assembly according to the water pressure value detected by the water pressure sensor.

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