Appliance coupler with water supply system

Abstract

The present invention relates to an appliance coupler with a water supply system, wherein an upper water inlet sleeve is provided in the center of an upper connector, a non-return valve core mechanism is provided in the upper water inlet sleeve, a lower water inlet sleeve is provided in the center of a lower connector, a lower sealing mechanism is provided in the lower water inlet sleeve, the lower sealing mechanism comprises a lower valve core, a lower valve seat opening is provided in the lower water inlet sleeve, a lower valve core spring is matched with the lower valve core, the non-return valve core mechanism comprises an upper water inlet plunger movably matched in the upper water inlet sleeve, an annular sealing portion is provided on the upper water inlet plunger, an upper valve seat opening is provided in the upper water inlet sleeve, a plunger reset spring is abutted against the upper water inlet plunger, as the upper water inlet sleeve is sealed and plugged with the lower water inlet sleeve, the upper water inlet plunger and the lower valve core push each other and form an upper valve seat opening and a lower valve seat opening to be opened in sequence, and as the upper water inlet sleeve is disengaged from the lower water inlet sleeve, the lower valve seat opening and the upper valve seat opening are closed in sequence. The bidirectional top-opening structure is adopted, which has the advantages of smooth and reliable water supply.

Description

Technical Field

[0001] The invention relates to a coupler used on appliances such as a hot water kettle, and more specifically to an appliance coupler with a water supply system. Background Art

[0002] At present, electric couplers have been widely used in electric kettles and other appliances. They include a lower connector (also called a lower coupler) and an upper connector (also called an upper coupler). Multiple ring-shaped metal electrodes are arranged in the lower connector and the upper connector. The upper connector is inserted into the lower connector to form electrical connection through the contact of the corresponding metal electrodes. In order to improve the convenience of using appliances such as kettles, a water supply device is provided on the coupler to guide liquid into the kettle body. The water supply device includes an upper water inlet component arranged in the upper connector and a lower water inlet component arranged in the lower connector. As the upper connector and the lower connector are plugged in and out, the upper water inlet component and the lower water inlet component are connected and disconnected.

[0003] The water supply device in the traditional coupler, such as the "A water supply system device for an appliance coupler used in an electric kettle" disclosed in the patent document with patent application number CN 201821800994.5, has a one-way valve only in the upper water inlet component, while the lower water inlet component is a straight-through sleeve design. After the upper water inlet component and the lower water inlet component are disconnected, there is a risk of overflow due to the straight-through pipe design of the lower water inlet component, which poses a safety hazard. To solve the above problems, as disclosed in the application number CN201410496584.6 and the title "Electric Kettle with New Automatic Water Supply Structure", an elastic sealing component is used in the lower water inlet sleeve of the lower water inlet assembly, so that the lower water inlet sleeve also has a shut-off function after the upper connector and the lower connector are disconnected. However, in order to open the elastic sealing component and the shut-off function of the upper water inlet assembly, the opening of the elastic sealing component is achieved by a push pin (numbered 19 in the document) fixed in the upper water inlet sleeve, and the valve structure in the upper water inlet assembly adopts a silicone sheet structure opened by water pressure impact (a two-level variable leak-proof cap 14 in the document), which has the problems of small opening degree, large water flow obstruction and slow water supply speed. Summary of the invention

[0004] Purpose of the invention: To overcome the defects of the prior art, the present invention provides an appliance coupler with smooth and reliable water supply.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An appliance coupler with a water supply system comprises an upper connector and a lower connector, wherein an upper water inlet sleeve is provided in the center of the upper connector, a check valve core mechanism is provided in the upper water inlet sleeve, a lower water inlet sleeve is provided in the center of the lower connector corresponding to the upper water inlet sleeve, a lower sealing mechanism is provided in the lower water inlet sleeve, the lower sealing mechanism comprises a lower valve core, a lower valve seat opening corresponding to the lower valve core is provided in the lower water inlet sleeve, the lower valve core is provided with a lower valve core spring driving the lower valve core to seal and close the lower valve seat opening, and the feature is that: the check valve core mechanism It includes an upper water inlet plunger movably fitted in an upper water inlet sleeve, the upper water inlet plunger is provided with an annular sealing portion, the upper water inlet sleeve is provided with an upper valve seat opening which is sealingly matched with the annular sealing portion, the upper water inlet plunger abuts against a plunger return spring which drives the upper water inlet plunger to seal and close the upper valve seat opening, as the upper water inlet sleeve is sealingly plugged into the lower water inlet sleeve, the upper water inlet plunger and the lower valve core push each other and cause the upper valve seat opening and the lower valve seat opening to be opened in sequence, and as the upper water inlet sleeve is disengaged from the lower water inlet sleeve, the lower valve seat opening and the upper valve seat opening are closed in sequence.

[0007] By adopting the above technical scheme, when the upper connector and the lower connector are plugged in, the upper water inlet sleeve and the lower water inlet sleeve are sealed and plugged in, and at the same time, the check valve core mechanism in the upper water inlet sleeve and the lower sealing mechanism in the lower water inlet sleeve are opened in sequence, so that after the upper water inlet sleeve and the lower water inlet sleeve are plugged in place, they are in a conducting state, which can effectively reduce the resistance to liquid circulation and make the water supply smoother.

[0008] Preferably, the upper water inlet plunger has a contact pressure portion corresponding to the water inlet port of the upper water inlet sleeve, and the lower valve core has a top contact end portion corresponding to the water outlet port of the lower water inlet sleeve. The contact pressure portion of the upper water inlet plunger and the top contact end portion of the lower valve core are in contact with each other, thereby forming a mutual push and match between the upper water inlet plunger and the lower valve core, and the spring return force of the plunger reset spring driving the upper water inlet plunger to seal and close the upper valve seat port is less than the spring return force of the lower valve core spring driving the lower valve core to seal and close the lower valve seat port. A stopper portion cooperating with the upper water inlet plunger stopper is provided in the upper water inlet sleeve, and the upper water inlet plunger is stopped by the stopper portion after axially sliding a certain stroke in the direction of opening the upper valve seat port. Under this structural design, the upper water inlet plunger and the lower valve core directly contact each other to form a push and open upper valve seat port and lower valve seat port, and the opening and closing sequence of the lower valve seat port and the upper valve seat port is realized by the different spring forces of the plunger reset spring and the lower valve core spring; it has the advantages of compact structure and small fluid resistance.

[0009] Preferably, the lower valve core comprises a barrel-shaped body axially movable in the lower water inlet sleeve, a valve core sealing part corresponding to the lower valve seat opening is provided at the bottom of the barrel-shaped body, a radial flow guide hole is provided through the annular barrel wall of the barrel-shaped body, the radial flow guide hole is located between the barrel opening of the barrel-shaped body and the valve core sealing part, the lower valve core spring abuts against the bottom end of the barrel-shaped body, when the valve core sealing part closes the lower valve seat opening, the radial flow guide hole on the barrel-shaped body is located in the lower water inlet sleeve, the valve core sealing part is separated from the lower valve seat opening until the radial flow guide hole passes over the lower valve seat opening, thereby forming a barrel cavity of the lower water inlet sleeve connected to the barrel-shaped body through the radial flow guide hole. Under this structural design, the lower valve core adopts a barrel-shaped structure design, which has the advantages of small liquid flow resistance and large flow rate.

[0010] Preferably, one end of the barrel mouth of the barrel-shaped body constitutes the top contact end, a water guide column that can pass through the upper valve seat mouth is axially extended on the annular sealing portion of the upper water inlet plunger, and the free end of the water guide column constitutes the contact and pressure portion, and a water inlet guide groove is opened on the side wall of the water guide column, one end of the water inlet guide groove extends toward one end of the annular sealing portion, and the other end of the water inlet guide groove passes through the free end of the water guide column. Under this structural design, the end of the water guide column and the barrel mouth of the barrel-shaped body are top-contacted and matched, which has the advantages of stable and reliable matching and small liquid flow resistance.

[0011] Preferably, the water guide column cooperates with the flow channel hole of the upper valve seat for positioning and guiding. Under this structural design, the water guide column cooperates with the flow channel hole of the upper valve seat to guide the movement of the upper water inlet plunger, making the installation and movement of the upper water inlet plunger more reliable.

[0012] Preferably, the free end of the water guide column is tapered. This structural design facilitates the positioning between the water guide column and the barrel mouth of the barrel-shaped body.

[0013] Preferably, one end of the barrel mouth of the barrel-shaped body can extend out of the water outlet of the lower water inlet sleeve when the valve core sealing part closes the lower valve seat mouth. Under this structural design, the axial length of the barrel-shaped body is extended to ensure the length of the barrel-shaped body to be moved by the top contact, and under the design of the barrel-shaped body with a large axial length, the barrel-shaped body can achieve good activity guidance. Since the liquid enters the barrel cavity of the barrel-shaped body through the radial guide hole and is discharged, the liquid can flow smoothly while ensuring the matching length required for the axial movement of the lower valve core.

[0014] Preferably, an integrally formed sealing rubber sleeve is provided at the water inlet of the upper water inlet sleeve, and the sealing rubber sleeve comprises a plug-in sleeve body sealingly sleeved with the lower water inlet sleeve and a valve seat sleeve body cooperating with the annular sealing portion, and the upper valve seat opening is formed in the valve seat sleeve body. Under this structural design, the sealing rubber sleeve forms an upper valve seat opening sealingly sleeved with the lower water inlet sleeve and sealed with the upper water inlet plunger, which has the advantages of compact structure, reliable sealing and good leakproof performance.

[0015] Preferably, the valve seat sleeve includes a frustoconical cavity, the small end of the frustoconical cavity is connected to the upper valve seat opening, the inner wall of the upper valve seat opening is smoothly connected to the wall of the frustoconical cavity, the upper valve seat opening is a conical cavity surrounded by a spherical crown surface wall, and the corresponding sealing surface of the annular sealing part is a spherical crown shape that matches the spherical crown surface wall of the upper valve seat opening. Under this structural design, the frustoconical cavity realizes the guidance of the upper water inlet plunger, and the shape design of the upper valve seat opening has the advantage of reliable sealing; and the shape structure of the annular sealing part has a small resistance to the fluid, which is convenient for the flow of the fluid.

[0016] Preferably, a stopper is provided in the upper water inlet sleeve to cooperate with the upper water inlet plunger stopper. The upper water inlet plunger is stopped by the stopper after sliding axially for a certain stroke in the direction of opening the upper valve seat. A plurality of stepped ribs are evenly spaced along the circumferential direction in the upper water inlet sleeve. The steps of the stepped ribs constitute the stopper for the upper water inlet plunger stopper. One end of the stepped ribs cooperates with the axial limit of the sealing rubber sleeve. The plunger return spring is a spiral spring. The plunger return spring is positioned and installed in the cavity surrounded by each stepped rib. Under this structural design, the upper water inlet plunger is stopped by the stopper, which is conducive to the upper water inlet plunger to push the lower valve core to open the lower valve seat after opening; stepped ribs are arranged at intervals along the circumferential direction in the upper water inlet sleeve. The intervals between the stepped ribs and the grooves forming the steps are convenient for the passage of fluid and reduce the resistance of the fluid. At the same time, the stepped ribs are convenient for positioning the plunger return spring.

[0017] The present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a specific embodiment of the present invention in which the appliance coupler with the water supply system is disconnected;

[0019] Figure 2 It is a structural schematic diagram of an upper water inlet sleeve and a lower water inlet sleeve after being sealed and plugged into place in a specific embodiment of the present invention;

[0020] Figure 3 It is a structural schematic diagram of the valve core in a specific embodiment of the present invention;

[0021] Figure 4 It is a structural schematic diagram of the water inlet plunger in a specific embodiment of the present invention;

[0022] Figure 5 It is a schematic structural diagram of the upper water inlet sleeve according to a specific embodiment of the present invention. DETAILED DESCRIPTION

[0023] See attached Figures 1 to 4The present invention discloses an appliance coupler with a water supply system, comprising an upper connector 1 and a lower connector 2. An upper water inlet sleeve 3 is provided at the center of the upper connector 1, and a check valve core mechanism is provided in the upper water inlet sleeve 3. A lower water inlet sleeve 4 corresponding to the upper water inlet sleeve 3 is provided at the center of the lower connector 2. A lower sealing mechanism is provided in the lower water inlet sleeve 4. The lower sealing mechanism comprises a lower valve core 51. A lower valve seat opening 41 corresponding to the lower valve core 51 is provided in the lower water inlet sleeve 4. The lower valve core 51 is equipped with a lower valve core spring 52 that drives the lower valve core 51 to seal and close the lower valve seat opening 41. The check valve core mechanism comprises a lower valve core spring 52 that is movably engaged in the lower valve core 51. The upper water inlet plunger 61 in the upper water inlet sleeve 3 is provided with an annular sealing portion 611, and the upper valve seat opening 31 sealingly matched with the annular sealing portion 611 is provided in the upper water inlet sleeve 3. The upper water inlet plunger 61 abuts against a plunger return spring 62 which drives the upper water inlet plunger 61 to seal and close the upper valve seat opening 31. As the upper water inlet sleeve 3 and the lower water inlet sleeve 4 are sealed and plugged in, the upper water inlet plunger 61 and the lower valve core 51 push each other and form the upper valve seat opening 31 and the lower valve seat opening 41 to be opened in sequence, and as the upper water inlet sleeve 3 and the lower water inlet sleeve 4 are disengaged, the lower valve seat opening 41 and the upper valve seat opening 31 are closed in sequence. When the upper connector 1 and the lower connector 2 are plugged in, the upper water inlet sleeve 3 and the lower water inlet sleeve 4 are sealed and plugged in, and at the same time, the check valve core mechanism in the upper water inlet sleeve 3 and the lower sealing mechanism in the lower water inlet sleeve 4 are opened in sequence, so that after the upper water inlet sleeve 3 and the lower water inlet sleeve 4 are plugged in place, they are in a conducting state, and as the upper water inlet sleeve is disengaged from the lower water inlet sleeve, the lower valve seat mouth and the upper valve seat mouth are closed in sequence, thereby realizing the device being lifted and closed, which is easy to operate; and compared with the traditional water pressure impact opening method, it can effectively reduce the resistance to liquid flow, making the water supply smoother.

[0024] The push-to-open between the upper water inlet plunger 61 and the lower valve core 51 can be achieved by relying on a specially designed push-to-open mechanism. However, under this design, there is an increase in components built into the fluid flow channel, thereby affecting the fluid resistance. Therefore, in this specific embodiment, the upper water inlet plunger 61 has a push-to-open portion 612 corresponding to the water inlet port of the upper water inlet sleeve 3, and the lower valve core 51 has a push-to-open end portion 512 corresponding to the water outlet port of the lower water inlet sleeve 4. The push-to-open portion 612 of the upper water inlet plunger 61 and the push-to-open portion 51 of the lower valve core 51 are connected to each other. The contact end portion 512 is in contact with each other, thereby forming a mutual pushing and cooperation between the upper water inlet plunger 61 and the lower valve core 51. The spring reset force of the plunger return spring 62 driving the upper water inlet plunger 61 to seal and close the upper valve seat opening 31 is smaller than the spring reset force of the lower valve core spring 52 driving the lower valve core 51 to seal and close the lower valve seat opening 41. A stop portion cooperating with the stopper of the upper water inlet plunger 61 is provided in the upper water inlet sleeve 3. The upper water inlet plunger 61 is stopped by the stop portion after axially sliding a certain stroke in the direction of opening the upper valve seat opening 31. The upper water inlet plunger 61 and the lower valve core 51 directly contact each other to push and open the upper valve seat port 31 and the lower valve seat port 41, and the opening and closing sequence of the lower valve seat port and the upper valve seat port is realized by relying on the different spring forces of the plunger return spring and the lower valve core spring. The upper water inlet plunger 61 is stopped by the stopper, which is beneficial for the upper water inlet plunger to push the lower valve core to open the lower valve seat port after opening; it has the advantages of compact structure and small fluid resistance.

[0025] In order to further reduce the fluid resistance and ensure smooth and reliable water supply, the following further structural design is adopted: the lower valve core 51 includes a barrel-shaped body 511 axially movably matched in the lower water inlet sleeve 4, and the bottom of the barrel-shaped body 511 is provided with a valve core sealing portion 514 corresponding to the lower valve seat opening 41. In this specific embodiment, the valve core sealing portion is a sealing rubber ring, and radial guide holes 513 are provided on the annular barrel wall of the barrel-shaped body 511. The number and size of the radial guide holes 513 are designed according to actual needs (4 designs are adopted in the figure), and the radial guide holes 513 are located between the barrel opening 5111 of the barrel-shaped body 511 and the valve core sealing portion 514. The lower valve core spring 52 is pressed against Connected to the bottom end of the barrel-shaped body 511, when the valve core sealing part 514 closes the lower valve seat opening 41, the radial flow guide hole on the barrel-shaped body is located in the lower water inlet sleeve, so that when the lower valve seat opening is closed, the fluid remaining in the barrel cavity 5110 of the barrel-shaped body 511 does not flow out, and the valve core sealing part 514 is separated from the lower valve seat opening 41 until the radial flow guide hole 513 passes over the lower valve seat opening 41, thereby forming the lower water inlet sleeve 4 connected to the barrel cavity 5110 of the barrel-shaped body 511 through the radial flow guide hole 513. When opened, the fluid enters the barrel cavity 5110 through the radial flow guide hole 513, and the fluid flows out through the barrel cavity 5110; the lower valve core adopts a barrel-shaped structure design, which has the advantages of small liquid flow resistance and large flow rate. Among them, the lower valve seat opening 41 is conical, which improves the sealing reliability.

[0026] One end of the barrel mouth 5111 of the barrel-shaped main body 511 constitutes the top contact end 512, and an axially extending water guide column 613 that can pass through the upper valve seat opening 31 is provided on the annular sealing portion 611 of the upper water inlet plunger 61, and the free end of the water guide column 613 constitutes the contact and pressure portion 612. A water inlet guide groove 6131 is provided on the side wall of the water guide column 613, and one end of the water inlet guide groove 6131 extends toward one end of the annular sealing portion 611, and the other end of the water inlet guide groove 6131 passes through the free end of the water guide column 613, so that the solid part of the water guide column is formed into a plurality of plate-like bodies arranged along the circumferential direction through the water inlet guide groove. In view of the reliability of the water guide column contacting and pressing the barrel-shaped main body and the efficiency of the fluid passing, it is preferably adopted that the water guide column is composed of three plate-like bodies; and the free end of the water guide column 613 is conical. This makes it easier to position the water guide column against the mouth of the barrel-shaped body; of course, as a feasible structure of the present invention, the free end portion 6122 of the water inlet guide column 612 can be a flat head design. The end of the water guide column is in contact with the mouth of the barrel-shaped body, which has the advantages of stable and reliable matching and low resistance to liquid flow. In addition, the outer circumferential size of the water guide column and the size of the flow channel hole of the upper valve seat are selected so that the water guide column and the flow channel hole of the upper valve seat are positioned and guided. The water guide column cooperates with the flow channel hole of the upper valve seat to guide the movement of the upper water inlet plunger 61, making the installation and movement of the upper water inlet plunger 61 more reliable and the structure more compact.

[0027] In this specific embodiment, one end of the barrel mouth 5110 of the barrel-shaped body 511 can extend out of the water outlet of the lower water inlet sleeve 4 (such as Figure 1 As shown); that is, when the valve core sealing part closes the lower valve seat opening, the barrel-shaped body has a protruding part that protrudes from the water outlet of the lower water inlet sleeve, and the radial guide hole remains in the lower water inlet sleeve. The protruding design of the barrel-shaped body ensures that the barrel-shaped body can timely contact with the upper water inlet plunger, thereby avoiding increasing the length of the water guide column, and the protruding part of the barrel-shaped body is compressed into the lower water inlet sleeve, which can play a positioning and guiding role for the barrel-shaped body. The barrel-shaped body can achieve good activity guidance. Since the liquid enters the barrel cavity of the barrel-shaped body through the radial guide hole and is discharged, the liquid can flow smoothly while ensuring the matching length required for the axial movement of the lower valve core. A spring positioning protrusion 515 is provided at the bottom of the barrel-shaped body 511, and the lower valve core spring 52 is a coil spring sleeved on the spring positioning protrusion 515. The spring positioning protrusion 515 adopts a cross-shaped or Y-shaped cross-sectional structure, which can not only play a good positioning and fixing role for the spring, but also facilitate the passage of liquid.

[0028] The upper water inlet sleeve and the lower water inlet sleeve need to be sealed and plugged in, and the sealing and plugging structure thereof can be designed using existing conventional technology. Considering that in the present invention, the water inlet of the upper water inlet sleeve 3 needs to be sealed and matched with the upper water inlet plunger 61 at the same time, the following preferred structural design is adopted: an integrally formed sealing rubber sleeve 3-1 is provided at the water inlet of the upper water inlet sleeve 3, and the sealing rubber sleeve 3-1 includes a plug-in sleeve 3-11 sealingly connected to the lower water inlet sleeve and a valve seat sleeve 3-12 matched with the annular sealing portion 611, and the upper valve seat opening 31 is formed in the valve seat sleeve 3-12, so that the cavity between the plug-in sleeve 3-11 and the valve seat sleeve 3-12 is connected via the central flow channel hole 311 of the upper valve seat opening 31. The plug-in sleeve is sealingly assembled in the upper water inlet sleeve port, and the plug-in sleeve provides sealing connection for the lower water inlet sleeve, while the integrally formed valve seat sleeve forms a sealing fit between the upper valve seat port and the upper water inlet plunger 61, which has the advantages of compact structure, reliable sealing fit and good leak-proof performance.

[0029] The valve seat sleeve 3-12 includes a frustoconical cavity 3-121, the small end of which is connected to the upper valve seat opening 31, the inner wall of the upper valve seat opening 31 is smoothly connected to the wall of the frustoconical cavity 3-121, and the upper valve seat opening 31 is a conical cavity surrounded by a spherical crown surface wall, and the corresponding sealing surface of the annular sealing portion 611 is a spherical crown that matches the spherical crown surface wall of the upper valve seat opening 31. The frustoconical cavity guides the upper water inlet plunger 61, and the shape design of the upper valve seat opening has the advantage of reliable sealing; and the shape structure of the annular sealing portion has a small resistance to the fluid, which is convenient for the flow of the fluid. Usually, the bottom of the water inlet guide groove 6131 adopts a spherical design that is transitioned and extended by the annular sealing portion, so that the fluid in the water inlet guide groove can be more smoothly discharged.

[0030] Several stepped ribs 32 are evenly arranged at intervals along the circumference in the upper water inlet sleeve 3. The steps 321 of the stepped ribs 32 constitute the stopper for stopping the upper water inlet plunger 61. One end of the stepped ribs 32 cooperates with the sealing rubber sleeve 3-1 in axial limiting. The plunger return spring 62 is a spiral spring. The plunger return spring 62 is positioned and installed in the cavity surrounded by each stepped rib 32. Stepped ribs arranged at intervals along the circumference are designed in the upper water inlet sleeve to limit the sealing rubber sleeve and stop the upper water inlet plunger. The intervals between the stepped ribs and the grooves forming the steps are convenient for the passage of fluid and reduce the resistance of the fluid. At the same time, the stepped ribs facilitate the positioning of the plunger return spring; it has the advantages of simple and compact overall structure.

Claims

1. An appliance coupler with a water supply system, comprising an upper connector and a lower connector, wherein an upper water inlet sleeve is provided in the center of the upper connector, a check valve core mechanism is provided in the upper water inlet sleeve, a lower water inlet sleeve is provided in the center of the lower connector corresponding to the upper water inlet sleeve, a lower sealing mechanism is provided in the lower water inlet sleeve, the lower sealing mechanism comprises a lower valve core, a lower valve seat opening corresponding to the lower valve core is provided in the lower water inlet sleeve, and the lower valve core is provided with a lower valve core spring driving the lower valve core to seal and close the lower valve seat opening, characterized in that: The check valve core mechanism comprises an upper water inlet plunger movably fitted in an upper water inlet sleeve, an annular sealing portion is provided on the upper water inlet plunger, an upper valve seat opening which is sealingly fitted with the annular sealing portion is provided in the upper water inlet sleeve, the upper water inlet plunger abuts against a plunger return spring which drives the upper water inlet plunger to seal and close the upper valve seat opening, as the upper water inlet sleeve is sealingly plugged into the lower water inlet sleeve, the upper water inlet plunger and the lower valve core push each other and form the upper valve seat opening and the lower valve seat opening to be opened in sequence, and as the upper water inlet sleeve is disengaged from the lower water inlet sleeve, the lower valve seat opening and the upper valve seat opening are closed in sequence; the upper water inlet plunger has a corresponding The lower valve core has a contact and pressure portion at the water inlet port of the water sleeve, and the lower valve core has a top contact end portion corresponding to the water outlet port of the lower water inlet sleeve. The contact and pressure portion of the upper water inlet plunger is in contact with and cooperates with the top contact end portion of the lower valve core, thereby constituting a mutual pushing and cooperation between the upper water inlet plunger and the lower valve core. The spring return force of the plunger return spring driving the upper water inlet plunger to seal and close the upper valve seat port is less than the spring return force of the lower valve core spring driving the lower valve core to seal and close the lower valve seat port. A stop portion cooperating with the upper water inlet plunger stop is provided in the upper water inlet sleeve, and the upper water inlet plunger is stopped by the stop portion after axially sliding a certain stroke in the direction of opening the upper valve seat port.

2. The appliance coupler with water supply system according to claim 1, characterized in that: The lower valve core includes a barrel-shaped main body axially movably engaged in a lower water inlet sleeve, a valve core sealing part corresponding to the lower valve seat opening is provided at the bottom of the barrel-shaped main body, a radial guide hole is provided through the annular barrel wall of the barrel-shaped main body, the radial guide hole is located between the barrel opening of the barrel-shaped main body and the valve core sealing part, the lower valve core spring abuts against the bottom end of the barrel-shaped main body, when the valve core sealing part closes the lower valve seat opening, the radial guide hole on the barrel-shaped main body is located in the lower water inlet sleeve, the valve core sealing part is separated from the lower valve seat opening until the radial guide hole passes over the lower valve seat opening, thereby forming a barrel cavity in which the lower water inlet sleeve is connected to the barrel-shaped main body via the radial guide hole.

3. The appliance coupler with water supply system according to claim 2, characterized in that: One end of the barrel mouth of the barrel-shaped body constitutes the top contact end portion, and a water guide column that can pass through the upper valve seat opening is axially extended from the annular sealing portion of the upper water inlet plunger, and the free end of the water guide column constitutes the contact and pressure portion. A water inlet guide groove is provided on the side wall of the water guide column, and one end of the water inlet guide groove extends toward one end of the annular sealing portion, and the other end of the water inlet guide groove passes through the free end of the water guide column.

4. The appliance coupler with water supply system according to claim 3, characterized in that: The water guide column is matched with the flow channel hole of the upper valve seat for positioning and guiding.

5. The appliance coupler with water supply system according to claim 3, characterized in that: The free end of the water guide column is tapered.

6. The appliance coupler with water supply system according to claim 2, 3, 4 or 5, characterized in that: One end of the barrel mouth of the barrel-shaped main body can extend out of the water outlet of the lower water inlet sleeve when the valve core sealing part closes the lower valve seat opening.

7. The appliance coupler with water supply system according to claim 1, 2, 3, 4 or 5, characterized in that: An integrally formed sealing rubber sleeve is provided at the water inlet of the upper water inlet sleeve. The sealing rubber sleeve comprises a plug-in sleeve body sealingly connected to the lower water inlet sleeve and a valve seat sleeve body cooperating with the annular sealing portion. The upper valve seat opening is formed in the valve seat sleeve body.

8. The appliance coupler with water supply system according to claim 7, characterized in that: The valve seat sleeve includes a frusto-conical cavity, the small end of the frusto-conical cavity is connected to the upper valve seat opening, the inner wall of the upper valve seat opening is smoothly transitioned to the wall of the frusto-conical cavity, the upper valve seat opening is a conical cavity surrounded by a spherical crown surface wall, and the corresponding sealing surface of the annular sealing part is a spherical crown shape that matches the spherical crown surface wall of the upper valve seat opening.

9. The appliance coupler with water supply system according to claim 7, characterized in that: A stopper portion cooperating with the upper water inlet plunger stopper is provided in the upper water inlet sleeve. The upper water inlet plunger is stopped by the stopper portion after axially sliding a certain stroke in the direction of opening the upper valve seat mouth. A plurality of stepped ribs are evenly spaced along the circumferential direction inside the upper water inlet sleeve. The steps of the stepped ribs constitute the stopper portion for the upper water inlet plunger stopper. One end of the stepped ribs cooperates with the axial limiting function of the sealing rubber sleeve. The plunger return spring is a coil spring. The plunger return spring is positioned and installed in the cavity surrounded by each stepped rib.

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