CN213065010U - Check valve structure of water tank - Google Patents

Abstract

The utility model discloses a check valve structure of a water tank, which comprises a water tank and a water tank seat, wherein the water tank is provided with an inserting part which is inserted in an open mouth on the water tank seat; the water tank also comprises a first check valve core and a second check valve core, wherein a first water outlet is arranged in the insertion part, the first check valve core is movably arranged in the first water outlet, a second water outlet is arranged in the water tank seat, and the second check valve core is movably arranged in the second water outlet; when the water tank is inserted into the open port, the first check valve core and the second check valve core are abutted to push the first check valve core to move upwards, the second check valve core moves downwards, and the first water outlet is communicated with the second water outlet; when the water tank is separated from the water tank, the first check valve core and the second check valve core elastically reset to seal the first water outlet and the second water outlet. The utility model provides a check valve case infiltration when purifier water tank flourishing water, and water pressure disappears after the water tank is dismantled, the water reflux in the product pipeline on the water tank seat leads to the problem of check valve case and water tank seat infiltration.

Description

Check valve structure of water tank

Technical Field

The utility model relates to a water purification unit seals field, refers in particular to a water tank check valve structure.

Background

Along with the continuous progress of society, the attention degree of people to healthy water is also higher and higher, and tap water is as the essential main water source of people's daily life, and its cleanliness degree can not satisfy people's increasingly higher healthy water requirement. Therefore, water purification devices capable of purifying and filtering drinking water to improve the quality of drinking water are becoming indispensable household devices in daily life.

At present, most of water purifying equipment commonly used in daily life is water purifiers, floating substances, heavy metals, silt, rust, bacteria and the like in filtered water are purified, residual chlorine in tap water can be filtered, and the taste of the water is improved; is popular with consumers. All be equipped with the water tank on the current purifier, the coupling assembling of water tank and purifier possesses and realizes that the water tank can realize leading to water after installing on the water tank seat, and the water tank is dismantled the two-way contrary function that ends of the imperviousness of back water tank and water tank seat.

Although the existing connecting assembly of the water purifier and the water tank can realize the bidirectional non-return of the water tank and the water tank seat, the following technical problems still exist:

1. after the water tank is detached from the water tank seat, when water is contained independently, the check valve at the bottom of the water tank can be subjected to water seepage;

2. after the water tank is detached from the water tank seat, water in a product pipeline on the water tank seat flows in a reverse direction to cause water seepage of the water tank seat and a check valve assembly in the water tank seat.

Therefore, in order to solve the above technical problems, it is necessary to research and develop a check valve core sealing structure with strong sealing performance, so as to prevent the water seepage of the check valve structure caused by the water backflow in the product pipeline in the water tank seat after the water tank is disassembled, and prevent the water seepage of the check valve core at the bottom of the water tank caused by the water pressure when the disassembled water tank is filled with water.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a water tank check valve structure for bottom check valve core infiltration when solving among the prior art water purifier water tank and dismantling flourishing water after, and because water pressure disappears after the water tank is dismantled, the water among the product pipeline is against the current on the water tank seat, leads to the problem of check valve structure and water tank seat infiltration.

In order to achieve the above object, the utility model provides a pair of water tank check valve structure, embodiment is as follows:

a check valve structure of a water tank comprises the water tank and a water tank seat, wherein an insertion part is arranged at the bottom of the water tank, an opening is formed in the water tank seat, and the insertion part is inserted in the opening; the water tank further comprises a first check valve core and a second check valve core, a first water outlet is formed in the insertion part, the first check valve core can be elastically and movably installed in the first water outlet, a second water outlet is formed in the position, corresponding to the opening, of the bottom of the water tank seat, and the second check valve core can be elastically and movably installed in the second water outlet; when the water tank is inserted into the open port, the first check valve core and the second check valve core are abutted, the first check valve core is pushed to move upwards along the direction of the first water outlet, and the second check valve core moves downwards along the direction of the second water outlet, so that the first water outlet is communicated with the second water outlet; when the water tank is separated from the water tank, the first check valve core is elastically reset, a first sealing element arranged on the first check valve core seals the first water outlet, the second check valve core is elastically reset, and a second sealing element arranged on the second check valve core seals the second water outlet.

At present, in the water purifier in the prior art, a check valve structure is arranged in a water tank seat, wherein the check valve structure can be used for opening a water tank and a check valve in the water tank seat in the installation process of the water tank so as to realize water supply, and after the water tank is separated from the water tank seat, the check valves in the water tank and the water tank seat are automatically closed so as to prevent water seepage; although can realize the purpose of leading to water and preventing the infiltration between water tank and the water tank seat, realize above-mentioned function of leading to water and need set up the mounting of a back-up check valve in the water tank seat, and the back-up check valve in with the water tank seat through the grafting part of water tank and water tank seat, thereby lead to the water tank and must set up the mouth of a river on the mounting in the water tank seat, the water capacity is few, and the conflict area of the back-up check valve in grafting portion and the water tank seat is little, probably there is the grafting position to produce the skew at the grafting in-process, lead to the unable open of check valve in the water tank seat, water in the water tank can't be carried on the product in the water tank seat.

The utility model discloses a water tank check valve structure, through being equipped with grafting portion in the water tank bottom, be equipped with the delivery port in the grafting portion, but be equipped with the first check valve core of elastic activity in the delivery port, set up the uncovered that supplies grafting portion to insert on the water tank seat, uncovered down has been equipped with the second delivery port, but be equipped with the second check valve core of elastic activity in the second delivery port, when the grafting portion grafting of water tank was in the uncovered of water tank seat, first check valve core and second check valve core contradict, the effort that produces of contradicting promotes the upward displacement of first check valve core along the first delivery port direction, the downward displacement of second check valve core along the second delivery port direction; thereby realizing the water passing of the water tank and the water tank seat; after the water tank is dismantled from the water tank seat, first check valve core and second check valve core elastic reset seal first delivery port and second delivery port, prevent that the water in the water tank from following the infiltration of first delivery port department to and the water in the water tank seat takes place from the condition of second check valve core infiltration against the current, solved effectively that current purifier water tank is flourishing water bottom check valve core infiltration, and because water pressure disappears after the water tank is dismantled, water in the product pipeline on the water tank seat is against the current, leads to the problem of check valve subassembly and water tank seat infiltration. And, adopt this check valve structure to make water tank and water tank seat realize directly through first delivery port and second delivery port intercommunication when leading to water and realize, the component of water-flowing is unimpeded to inside, guarantee the water yield of purifier, utilize the conflict of first check valve core and second check valve core to realize opening and sealing of first delivery port and second delivery port simultaneously, area of contact is big, can guarantee opening of the second check valve core in the water tank seat, because the grafting of water tank has the deviation when having avoided adopting grafting portion to promote the displacement of second check valve core, the condition that leads to unable opening second check valve core takes place.

As a further improvement, be equipped with the spacing bulge loop of inside extension in the first delivery port, the setting of the slope form that the diameter down enlarges gradually along the top is presented to the spacing bulge loop, works as when water tank and water tank seat separate, first sealing member with spacing bulge loop is inconsistent. Through being equipped with the spacing bulge loop of inside extension in first delivery port, and the diameter of spacing bulge loop is looked into by the top and is expanded gradually down, when water tank and water tank seat separation, first sealing member is along first contrary case and resets, contradicts on the top inclined plane of spacing bulge loop for the contact point of first sealing member and spacing bulge loop, and the connecting wire between the contact point of first sealing member and first contrary case and vertical downward direction are the contained angle setting, and when the water tank was flourished, the pressure of water was used in on first sealing member do first sealing member provides compressive force, improves the sealing performance of first delivery port.

Further, be equipped with the pressure disk in the water tank seat, the pressure disk bottom is equipped with downwardly extending's boss, boss cavity sets up and forms the second delivery port, be equipped with the spacing portion of inside extension in the second delivery port, spacing portion is the slope form setting that the diameter gradually enlarges from the bottom up, works as when water tank and water tank seat separate, the second sealing member with spacing portion is inconsistent. Through set up the spacing portion of inside extension in the second delivery port, just spacing portion diameter is up enlarged gradually by the bottom, works as when during water tank and water tank seat separation, the second sealing member resets along with the contrary case of second check, contradicts on the inclined plane of spacing portion bottom, causes the contact point of second sealing member and spacing portion, and the connecting wire between the contact point of second sealing member and the contrary case of second check is the contained angle form setting with vertical direction of making progress to make the water pressure of the interior water countercurrent production of water tank seat provide compressive force for the second sealing member, improve the sealing performance of second delivery port.

Furthermore, a first contact part is arranged at the bottom of the first check valve core, a second contact part is arranged at the top of the second check valve core, and when the water tank is inserted into the water tank seat, the first contact part is abutted against the second contact part. By arranging the first contact part and the second contact part, when the water tank is inserted into the water tank seat, the acting force generated when the first contact part and the second contact part are abutted pushes the first check valve core to move upwards, the second check valve core moves downwards to communicate the first water outlet and the second water outlet, and the water passing of the check structure is realized; when the water tank is separated from the water tank seat, the first contact part is separated from the second contact part, the force of interaction disappears, the first check valve core and the second check valve core elastically reset to drive the first sealing element and the second sealing element to seal the first water outlet and the second water outlet respectively in a sealing mode, and sealing water seepage prevention of the check valve structure is achieved.

Furthermore, a first elastic piece for driving the first check valve core to elastically reset is arranged on the first check valve core, and two ends of the first elastic piece are respectively abutted against the first contact part and the bottom of the limiting convex ring; and a second elastic piece for driving the second check valve core to elastically reset is arranged on the second check valve core, and two ends of the second elastic piece are respectively abutted against the second contact part and the top of the limiting part. Through contradicting at first contact site and second contact site respectively, improve the connection stability of first elastic component and second elastic component to can further restrict the home range of first contrary case and second contrary case through the conflict of first elastic component and spacing bulge loop and the conflict of second elastic component and spacing portion, solve first contrary case and second contrary case and break away from or the problem that first elastic component and second elastic component compression are excessively burst out at the in-process of opening or closing.

As a further improvement, the pressure disk below be equipped with the shell body of connection can be dismantled to the water tank seat, the pressure disk sets up the water tank seat with between the shell body, be equipped with the conduit of intercommunication product pipeline in the shell body, work as the water tank is pegged graft when in the water tank seat, conduit with the second delivery port intercommunication, just be equipped with the restriction in the conduit the baffle of second contrary case downward displacement stroke. The baffle is arranged in the water conveying pipeline in the outer shell, the second check valve core moves downwards to abut against the baffle, the displacement stroke of the second check valve core is limited, and the second check valve core can be effectively prevented from being pushed to move upwards by the action force of mutual interference due to the fact that the displacement stroke of the second check valve core is too large; and the second elastic piece on the second check valve core is too large in compression amount to cause collapse, so that the condition that the check valve structure is damaged is relieved.

The water tank seat sealing ring is arranged between the water tank seat and the outer shell and is used for being in sealing fit with the insertion part; the water tank seat sealing ring is provided with a groove, the pressure plate is provided with a lug matched with the groove, and when the water tank seat is connected with the outer shell, the outer shell enables the lug on the pressure plate to be inserted into the groove, so that the pressure plate can compress and fix the water tank seat sealing ring in the water tank seat. The joint of the water tank seat and the pressure plate is provided with the water tank seat sealing ring, so that the water leakage of the water tank seat can be prevented.

Furthermore, an outer shell sealing ring is arranged at the joint of the outer shell and the pressure plate, and the pressure plate is tightly pressed on the top of the outer shell sealing ring. The check valve shell sealing ring is arranged at the joint of the outer shell and the pressure plate, so that the situation of water seepage of the check valve shell can be prevented.

As a further improvement of the present invention, the first sealing element and the second sealing element are silica gel sealing rings; the first check valve core is provided with a first mounting groove, the first sealing element is sleeved in the first mounting groove, the second check valve core is provided with a second mounting groove, and the second sealing element is sleeved in the second mounting groove. Through be equipped with the first mounting groove and the second mounting groove that supply first sealing member and second sealing member cover to establish on first contrary case and the second contrary case, improve the connection convenience and the stability of first sealing member and second sealing member, prevent that the condition that first sealing member and second sealing member dropped at the in-process that the check valve displacement or reset from taking place.

As a further improvement of the present invention, the first elastic member and the second elastic member are return springs. The first check valve core and the second check valve core can be reset by using the elasticity and the compressibility with excellent elasticity by using the reset spring as the reset part of the first check valve core and the second check valve core, so that the function of preventing water seepage of the check valve structure is realized.

Drawings

FIG. 1 is a cross-sectional view of the check valve structure of the water tank of the present invention;

FIG. 2 is a sectional view of the check valve structure of the water tank after the water tank is disassembled according to the present invention;

FIG. 3 is an exploded view of the check valve structure of the water tank of the present invention;

fig. 4 is a schematic structural diagram of the sealing ring of the water tank seat of the present invention.

Detailed Description

The utility model discloses a water tank check valve structure is explained with the attached drawing.

As shown in fig. 1-4, the check valve structure of the water tank comprises a water tank 1 and a water tank base 2, wherein the water tank 1 is detachably inserted into the water tank base 2, an insertion part 11 is arranged at the bottom of the water tank 1, a first water outlet 12 penetrating through the insertion part 11 is arranged in the insertion part 11, and a first check valve core 31 capable of elastically moving is arranged in the second water outlet 12; an opening 22 for inserting the inserting part 11 is arranged in the water tank seat 2, a second water outlet 51 is arranged under the opening 22, and a second check valve core 32 capable of elastically moving is arranged in the second water outlet 51.

Specifically, when the insertion part 11 of the water tank 1 is inserted into the opening 22 of the water tank seat 2, the first check valve core 31 and the second check valve core 32 are abutted, an acting force generated by the mutual interference pushes the first check valve core 31 to move upwards along the direction of the first water outlet 12, the second check valve core 32 moves downwards along the direction of the second water outlet 51, the first water outlet 12 and the second water outlet 51 are opened, the communication between the first water outlet 12 and the second water outlet 51 is realized, and the water tank in the water tank 1 is conveyed to a product pipeline sequentially through the first water outlet 12 and the second water outlet 51.

Further, after the water tank 1 is detached from the water tank base 2, the first check valve core 31 and the second check valve core 32 are separated, the acting force generated by mutual interference disappears, the first check valve core 31 and the second check valve core 32 elastically reset to seal the first water outlet 12 and the second water outlet 51, and water seepage of the water tank 1 and the water tank base 2 is prevented.

The water tank is characterized in that a limiting convex ring 13 extending inwards is arranged in the water outlet 12, the limiting convex ring 13 is arranged in an inclined manner from the top downwards, a first sealing element 4 is sleeved on the first check valve core 31, when the water tank 1 is detached from the water tank base 2, the first sealing element 4 is abutted to the limiting convex ring 13, the contact point of the first sealing element 4 and the limiting convex ring 13 and the contact point of the first sealing element 4 and the first check valve core 31 are contacted, and a connecting line between the two points is arranged at an included angle with the vertical downward direction.

Adopt the water tank 1 that above-mentioned structure set up when flourishing water, because first sealing member 4 respectively with first contrary case 31 and spacing bulge loop 13's contact point, the connecting wire between two points is the contained angle setting with vertical downward direction for the pressure of the water that gets into in the water tank 1 is used in first sealing member 4, does first sealing member 4 improves the compressive force, thereby improves the sealing performance of first sealing member 4, when the water tank of solving traditional purifier is flourishing water alone, because the water pressure in the water tank leads to the problem of contrary case infiltration of checking.

Wherein, 2 bottoms of water tank seat are equipped with pressure disk 5, pressure disk 5 bottom is equipped with downwardly extending's boss 52, be equipped with in the boss 52 second delivery port 51, be equipped with the spacing portion 53 of inside extension in the second delivery port 51, spacing portion 53 is the slope form setting up by the bottom.

Further, the second check valve core 32 is sleeved with a second sealing element 6, after the water tank 1 is separated from the water tank seat 2, the second check valve core 32 is closed, at this time, the second sealing element 6 is abutted to the limiting portion 53, a contact point of the second sealing element 6 and the limiting portion 53 and a contact point of the second sealing element 6 and the second check valve core 32 are arranged, and a connecting line between the two points and the vertical upward direction form an included angle.

Further, pressure disk 5 below be equipped with the shell body 7 that pressure disk 5 is connected, pressure disk 5 and water tank seat 2 are installed in the shell body 7, pressure disk 5 sets up between water tank seat 2 and the shell body 7, be equipped with the conduit 71 for the product supplies water in the shell body 7, be equipped with the restriction in the conduit 71 the baffle 72 of second check valve core 32 home range.

By adopting the check valve structure arranged by the structure, after the water tank 1 is separated from the water tank seat 2, water in the water pipeline 71 for supplying water for products flows reversely to the second check valve core 32, and because the second sealing element 6 is respectively arranged at an included angle with the vertical upward direction with the connecting line between the contact points of the second check valve core 32 and the limiting part 53, the water pressure generated by the reverse flow of water is enabled to be the compression force provided by the second sealing element 6, the sealing performance of the second sealing element 6 is improved, and the problem that the water tank seat and the check valve core are seeped due to the reverse flow of the water in the water pipeline after the water tank of the traditional water purifier is disassembled is solved.

Specifically, the bottom of the first check valve element 31 is provided with a first contact portion 311, the top of the second check valve element 32 is provided with a second contact portion 321, and when the water tank 1 is inserted into the water tank seat 2, the first contact portion 311 is abutted against the second contact portion 321.

Further, the valve further comprises a first elastic part 33 and a second elastic part 34 which are respectively sleeved on the first check valve core 31 and the second check valve core 32, wherein one end of the first elastic part 33 is abutted against the first contact part 311, and the other end of the first elastic part is abutted against the top of the limiting convex ring 13; one end of the second elastic element 34 abuts against the second contact portion 321, and the other end abuts against the top of the limiting portion 53.

Specifically, the first elastic element 33 is used for providing elastic power for the resetting of the first check valve core 31; the second elastic element 34 is used for providing elastic power for the resetting of the second check valve core 32.

Further, the first elastic member 33 and the second elastic member 34 are return springs.

Specifically, a baffle 72 is arranged in the water pipe 71, when the water tank 1 is installed in the water tank seat 2, the first check valve core 31 and the second check valve core 32 are mutually abutted, so that the first check valve core 31 is upwards displaced along the direction of the first water outlet 12, and the first water outlet 12 is opened; the second check valve core 32 moves downwards along the direction of the second water outlet 51, and the second water outlet 51 is opened, so that when the water purifier realizes water passing, the baffle 72 limits the displacement stroke of the second check valve core 32, and the situation that the water purifier cannot realize water passing because the first check valve core 31 cannot be pushed to move upwards by the mutual interference force of the first check valve core 31 and the second check valve core 32 due to the overlong displacement distance of the second check valve core 32 in the water conveying pipeline 71 is avoided. When the second elastic member 34 of the second check valve element 32 is compressed excessively due to the displacement of the second check valve element 32, the second elastic member 34 may collapse, damage the second elastic member 34, and even damage the second check valve element 32.

Wherein, be equipped with first mounting groove 312 on the first contrary case 31, first sealing member 4 is installed in first mounting groove 312, be equipped with second mounting groove 322 on the second contrary case 32, second sealing member 6 is installed in the second mounting groove 321, improve the installation steadiness of first sealing member 4 and second sealing member 6.

Wherein, a water tank seat sealing ring 21 which is used for being in sealing fit with the insertion part 11 is arranged between the water tank seat 2 and the outer shell 7, a first sealing ring 211 and a second sealing ring 212 are arranged on the water tank seat sealing ring 21, the first sealing ring 211 and the second sealing ring are respectively abutted against the insertion part 11, the first sealing ring 211 is a straight edge sealing ring which is vertical to the axial direction of the water tank seat sealing ring 21, the second sealing ring 212 is a bevel edge sealing ring which forms an included angle with the axial direction of the water tank seat sealing ring 21, when the water tank 1 is inserted in the water tank seat 2, the sealing performance of the water tank seat sealing ring 21 is improved under the action of the first sealing ring 211 and the second sealing ring 212, when the water tank 1 slightly moves upwards, the bevel edge of the second sealing ring 212 can be driven to change into a straight edge, and the contact area of the second sealing ring 212 and the insertion part is improved, thereby improving the sealing performance of the water tank seat sealing ring 21, ensuring the sealing performance of the joint of the water tank 1 and the water tank seat 2 and preventing water seepage.

The second sealing ring 212 of the tank seat sealing ring 21 is a bevel edge sealing ring, which can play a certain guiding role when the insertion part 11 of the water tank 1 is inserted into the opening 22.

Specifically, be equipped with recess 213 on the water tank seat sealing washer 21, be equipped with on the pressure disk 5 with recess 213 complex lug 52, work as water tank seat 2 with when shell body 7 is connected, because the effect of shell body 7 and water tank seat 2, lug 52 on the pressure disk 5 inserts in the recess 213, make pressure disk 5 will water tank seat sealing washer 21 compresses tightly to be fixed in the water tank seat 2.

Further, the water tank base 2 and the outer housing 7 are connected by means of screws or bolts.

Wherein, the junction of pressure disk 5 and shell body 7 is equipped with shell body seal circle 8, shell body seal circle 8 specifically is through water tank seat 2, water tank seat seal circle 21 and pressure disk 5 connection back, through the screw with water tank seat 2 and check valve shell fixed connection to compress tightly between shell body 7 and pressure disk 5, can make shell body seal circle 8 have good sealing performance, prevent the condition of infiltration takes place for the junction of shell body 7 and pressure disk 5.

The utility model discloses a check valve structure has simple structure, sealing performance is good, the advantage of prevention of seepage water, has solved the check valve structure of traditional purifier effectively and is using water tank and water tank seat separation back, and when the water tank was flourished alone, the check valve on the water tank leaded to the infiltration because of the water pressure reason to and the problem that check valve subassembly and water tank seat were waded because the water reflux in the product pipeline of check valve subassembly in the water tank seat.

Variations and modifications to the above-described embodiments may occur to those skilled in the art, in light of the above teachings and teachings. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should fall within the protection scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims (10)

1. A check valve structure of a water tank comprises the water tank and a water tank seat, wherein an insertion part is arranged at the bottom of the water tank, an opening is formed in the water tank seat, and the insertion part is inserted in the opening; the water tank is characterized by further comprising a first check valve core and a second check valve core, wherein a first water outlet is formed in the insertion part, the first check valve core can be elastically and movably arranged in the first water outlet, a second water outlet is formed in the position, corresponding to the opening, of the bottom of the water tank seat, and the second check valve core can be elastically and movably arranged in the second water outlet; when the water tank is inserted into the open port, the first check valve core and the second check valve core are abutted, the first check valve core is pushed to move upwards along the direction of the first water outlet, and the second check valve core moves downwards along the direction of the second water outlet, so that the first water outlet is communicated with the second water outlet; when the water tank is separated from the water tank, the first check valve core is elastically reset, a first sealing element arranged on the first check valve core seals the first water outlet, the second check valve core is elastically reset, and a second sealing element arranged on the second check valve core seals the second water outlet.

2. The check valve structure of the water tank as claimed in claim 1, wherein a limiting convex ring extending inwards is arranged in the first water outlet, the limiting convex ring is arranged in an inclined shape with a diameter gradually expanding downwards along the top, and when the water tank is separated from the water tank base, the first sealing element is abutted against the limiting convex ring.

3. The check valve structure of the water tank as claimed in claim 1, wherein a pressure plate is arranged in the water tank seat, a boss extending downward is arranged at the bottom of the pressure plate, the boss is hollow to form the second water outlet, an inwardly extending limiting portion is arranged in the second water outlet, the limiting portion is arranged in an inclined shape with a diameter gradually increasing from the bottom to the top, and when the water tank is separated from the water tank seat, the second sealing member is abutted against the limiting portion.

4. The check valve structure of the water tank as claimed in claim 3, wherein a first contact portion is provided at the bottom of the first check valve core, and a second contact portion is provided at the top of the second check valve core, and when the water tank is inserted into the water tank seat, the first contact portion and the second contact portion are abutted.

5. The check valve structure of the water tank as claimed in claim 4, wherein the first check valve core is provided with a first elastic member for driving the first check valve core to elastically reset, and two ends of the first elastic member are respectively abutted against the first contact portion and the bottom of the limiting convex ring; and a second elastic piece for driving the second check valve core to elastically reset is arranged on the second check valve core, and two ends of the second elastic piece are respectively abutted against the second contact part and the top of the limiting part.

6. The water tank check valve structure according to claim 3, wherein an outer casing detachably connected with the water tank seat is arranged below the pressure plate, the pressure plate is arranged between the water tank seat and the outer casing, a water pipe communicated with a product pipeline is arranged in the outer casing, and when the water tank is inserted in the water tank seat, the water pipe is communicated with the second water outlet.

7. The water tank check valve structure of claim 6, further comprising a water tank seat sealing ring, the water tank seat sealing ring being disposed between the water tank seat and the outer housing for sealing engagement with the insertion portion; the water tank seat sealing ring is provided with a groove, the pressure plate is provided with a lug matched with the groove, and when the water tank seat is connected with the outer shell, the outer shell enables the lug on the pressure plate to be inserted into the groove, so that the pressure plate can compress and fix the water tank seat sealing ring in the water tank seat.

8. The water tank check valve structure of claim 7, wherein an outer casing sealing ring is arranged at the joint of the outer casing and the pressure plate, and the pressure plate is arranged to press against the top of the outer casing sealing ring.

9. The water tank check valve structure of claim 1, wherein the first and second seals are silicone seals; the first check valve core is provided with a first mounting groove, the first sealing element is sleeved in the first mounting groove, the second check valve core is provided with a second mounting groove, and the second sealing element is sleeved in the second mounting groove.

10. The tank check valve structure of claim 5, wherein the first and second elastic members are return springs.

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