A double-layer multi-way valve core structure and a water valve

Abstract

The present invention discloses a double-layer multi-way valve core structure and water valve, comprising a valve body, wherein a central flow hole is provided at the bottom center of the valve body, and a plurality of inner flow holes and a plurality of outer flow holes are provided in an annular pattern around the central flow hole; a lower valve seat is provided in the middle of the valve body and closely abuts the bottom of the valve body; a lower valve core is provided in the middle of the valve body and closely abuts the lower valve seat, and a pair of first fan-shaped cavities are provided symmetrically around the center of the lower valve core; a base is provided within the valve body and outside the lower valve core, and the base is provided with a communication channel corresponding to the outer flow holes; an upper valve core is provided above the upper valve seat and closely abuts the upper valve seat, and the upper valve core has a second fan-shaped cavity and a communication cavity, and a support column is provided at the center of the upper valve core to drive the lower valve core to rotate. The present invention can solve the problems of existing electronic water valves with five or more channels, such as large size, large fluid resistance, and slow flow control response time.

Description

Technical Field

[0001] The present invention relates to the field of water valves, and in particular to a double-layer multi-way valve core structure and a water valve with low pressure loss, fast response and small size. Background Art

[0002] In recent years, with the rapid development of the new energy vehicle industry, its thermal management systems have become increasingly integrated and intelligent. Compared to traditional fuel vehicles, new energy vehicles (NEVs) have significantly different thermal management systems due to their different drive systems and energy architectures. The drive motors of NEVs require high power and high speeds, which generate significant heat during high-speed driving. Failure to dissipate this heat in a timely manner can severely impact the motor's performance and service life. To improve driving range, automakers often choose batteries with high energy density and high discharge rates. However, excessive energy density and discharge rates inevitably generate significant heat during battery operation. Excessive temperatures not only impact battery life but can also easily lead to safety accidents. The thermal management systems of NEVs are complex, with different operating systems requiring different temperature control requirements, resulting in varying coolant flow rates. Therefore, NEVs require efficient thermal management systems to ensure stable operation, but temperature control presents significant challenges. With increasingly stringent energy conservation and emission reduction policies, traditional automotive thermostats suffer from shortcomings such as response delay and hysteresis, resulting in poor flowability and difficulty in accurately controlling flow rates. This results in inefficient thermal management and makes them unable to meet the stringent temperature control requirements of NEVs. Therefore, the thermal management system of traditional automobiles is also being gradually optimized. Some models now use electronic water valves instead of traditional thermostats to adjust the coolant.

[0003] The electronic water valve is a new type of coolant flow control valve in the thermal management system of new energy vehicles. Its function and operating principle are similar to those of the thermostat in traditional fuel vehicles. Its main function is to adaptively adjust the coolant flow rate in each pipeline according to the temperature changes of different working parts, ensuring that the battery, motor, and other components are at the optimal operating temperature environment, thereby achieving energy conservation, emission reduction, and improved energy utilization.

[0004] Currently, the structural design of electronic water valves with five or more channels typically uses a column valve structure. The outer inlet and outlet flow channels are located on the sidewalls, and the central valve core is also equipped with flow channels. Rotating the valve core can switch the flow channels, change the flow direction, and adjust the flow rate, thereby switching the valve body into different modes. The design of the valve core and valve seat structure can achieve flow proportional regulation. However, because the outer flow channels are located on the sidewalls and the inlet and outlet are oriented vertically, the fluid must undergo multiple changes of direction as it flows through the valve core, significantly increasing the fluid pressure drop, wasting energy, seriously affecting the life of the thermal management system and other components, and even causing safety accidents. Furthermore, the sidewall flow channels of the water valve make the entire valve body bulky, which is not conducive to the miniaturization and lightweighting of the thermal management system and affects the layout of other components and flow channels in the thermal management system. Furthermore, the large size further affects the response time and adjustment accuracy of the water valve's flow regulation. Summary of the Invention

[0005] The present invention provides a double-layer multi-way valve core structure and water valve with low pressure loss, fast response and small size, which can solve the problems of existing electronic water valves with more than five ways, such as large size, large fluid resistance and slow flow regulation response time.

[0006] To achieve the above-mentioned objectives, in the first aspect, the present invention provides the following technical solutions: a double-layer multi-way valve core structure, comprising a valve body, a central flow hole is provided at the bottom center of the valve body, a plurality of inner flow holes are provided in a ring around the central flow hole, and a plurality of outer flow holes are evenly provided on the outer side of the inner flow hole along the circumference of the bottom edge of the valve body; a lower valve seat is provided in the middle of the valve body and is tightly attached to the bottom of the valve body, a through hole corresponding to the inner flow hole is provided on the lower valve seat, and a lower sealing gasket is provided between the lower valve seat and the valve body; a lower valve core is provided in the middle of the valve body and is tightly attached to the lower valve seat, a straight through hole corresponding to the central flow hole is provided at the center of the lower valve core, and a pair of first fan-shaped cavities are symmetrically provided around the straight through hole on the end surface of the lower valve core facing the lower valve seat, and the position of the fan-shaped cavity corresponds to the inner flow hole. The circulation between the inner circulation holes is switched by rotating the lower valve core; the base is arranged inside the valve body and located on the outside of the lower valve core, and the base is provided with a connecting channel corresponding to the outer circulation hole, and an upper valve seat is installed on the upper side of the base, and an upper sealing gasket is provided between the upper valve seat and the base; the upper valve core is arranged on the upper side of the upper valve seat and is tightly attached to the upper valve seat, and the upper valve core has a second fan-shaped cavity arranged near the edge and a connecting cavity located in the middle of the upper valve core, the second fan-shaped cavity and the connecting cavity correspond to the connecting channel, and the circulation between the outer circulation holes is switched by rotating the upper valve core, and a support column is provided in the center of the upper valve core to pass through the upper valve seat, the upper sealing gasket and the base and insert into the straight hole, and the support column cooperates with the lower valve core to drive the lower valve core to rotate, and the support column is connected to the connecting cavity and the balancing hole on the side wall of the connecting cavity. In the solution of the present invention, inner layer flow holes and outer layer flow holes are provided at the bottom of the valve body. The number of flow holes is large, which reduces the volume of the valve body. The inner layer flow holes control the flow through the first fan-shaped cavity in the lower valve core, and the outer layer flow holes are connected through the second fan-shaped cavity and the connecting cavity on the upper valve core. The upper valve core and the lower valve core can be controlled synchronously or asynchronously, thereby realizing switching of more modes and reducing the number of water valves in the thermal management system.

[0007] Preferably, the inner layer circulation holes include a first inner layer circulation hole, a second inner layer circulation hole, a third inner layer circulation hole and a fourth inner layer circulation hole arranged in a ring shape, and the outer layer circulation holes include a first outer layer circulation hole, a second outer layer circulation hole, a third outer layer circulation hole and a fourth outer layer circulation hole. The inner layer circulation holes, the outer layer circulation holes and the central circulation hole constitute a nine-hole circulation structure.

[0008] Preferably, the upper end ports of the connecting channels corresponding to the third outer layer circulation holes and the first outer layer circulation holes are waist-shaped ports, the upper end ports of the connecting channels corresponding to the second outer layer circulation holes and the fourth outer layer circulation holes are round ports, the connecting channels corresponding to the third outer layer circulation holes and the first outer layer circulation holes correspond to the second fan-shaped cavity, the connecting channels corresponding to the second outer layer circulation holes and the fourth outer layer circulation holes correspond to the connecting cavity, and the nine-hole circulation structure can realize switching among six working modes.

[0009] Preferably, an anti-rotation structure is provided on the outer side of the support column, and a stopper is provided on the outer side of the support column to cooperate with the anti-rotation structure. A toggle plate is radially extended from the outer wall of the stopper, and the toggle plate cooperates with the limiting arc groove on the side wall of the straight through hole of the lower valve core. The anti-rotation structure cooperates with the stopper to realize the installation of the stopper, and the stopper can drive the lower valve core to rotate, thereby realizing synchronous movement between the upper valve core and the lower valve core.

[0010] Preferably, the interior of the base is provided with an elastic member which is sleeved on the outside of the support column, and the lower end of the elastic member is against the lower valve core. The elastic member can apply a downward force to the lower valve core to improve the sealing between the lower valve core and the lower valve seat.

[0011] Preferably, the outer edge of the lower valve seat is provided with at least one first limiting groove, the inner bottom surface of the valve body is provided with a groove corresponding to the shape of the lower valve seat, and the side wall of the groove is provided with a limiting protrusion corresponding to the first limiting groove. The anti-rotation positioning and precise installation of the lower valve seat can be achieved by mutual engagement of the limiting protrusion and the first limiting groove.

[0012] Preferably, at least one second limiting groove is provided on the edges of the upper valve seat, base and upper sealing gasket, and a limiting boss is provided on the inner side wall of the valve body to cooperate with the second limiting groove. The relative positions of the upper valve seat, base and upper sealing gasket can be limited at the same time through the clamping connection between the limiting boss and the second limiting groove to prevent the upper valve seat and base from moving when the upper valve core rotates.

[0013] Preferably, a circle of guide bosses is provided on the lower end surface of the lower valve core around the straight-through hole, and the guide bosses are embedded in the central hole of the lower valve seat. Such a structure can prevent the lower valve core and the lower valve seat from offsetting and ensure their sealing.

[0014] Preferably, the upper valve core includes an umbrella-shaped cover body and an inlay embedded in the middle of the umbrella-shaped cover body, the support column is a part of the inlay, the connecting cavity is surrounded by the umbrella-shaped cover body and the inlay, and the balance hole is arranged at the upper end of the inlay. The use of the inlay can improve the overall strength of the upper valve core, and can also improve the strength of the connection between the upper valve core and the lower valve core, and the structure of the umbrella-shaped cover body and the inlay is easier to process and produce.

[0015] In a second aspect, the present invention further provides a water valve comprising the double-layer multi-way valve core structure as described in the first aspect.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention provides inner and outer flow holes at the bottom of the valve body. The large number of flow holes reduces the size of the valve body. The inner flow holes control flow through a first fan-shaped cavity within the lower valve core, while the outer flow holes communicate through a second fan-shaped cavity and a connecting cavity within the upper valve core. The upper and lower valve cores can be controlled synchronously or asynchronously, enabling switching between multiple modes and reducing the number of water valves in the thermal management system. The flow paths within the upper and lower valve cores have fewer corners, resulting in less fluid backflow, less flow resistance and loss, lower pressure drop, and less energy loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is an exploded three-dimensional structural diagram of the valve core structure of the present invention from a first perspective;

[0019] Figure 2 This is an exploded three-dimensional structural diagram of the valve core structure of the present invention from a second perspective;

[0020] Figure 3 It is a main cross-sectional structural diagram of the present invention;

[0021] Figure 4 It is a three-dimensional structural diagram of the valve body of the present invention;

[0022] Figure 5 It is a three-dimensional structural diagram of the lower valve seat of the present invention;

[0023] Figure 6 This is a three-dimensional structural diagram of the lower valve core of the present invention from a first perspective;

[0024] Figure 7 This is a second perspective three-dimensional structural diagram of the lower valve core of the present invention;

[0025] Figure 8 It is a three-dimensional structural diagram of the base of the present invention;

[0026] Figure 9 It is a three-dimensional structural diagram of the upper valve seat of the present invention;

[0027] Figure 10 This is a three-dimensional structural diagram of the upper valve core of the present invention from a first perspective;

[0028] Figure 11 This is a second perspective three-dimensional structural diagram of the upper valve core of the present invention;

[0029] Figure 12 A three-dimensional structural diagram of a stopper of the present invention;

[0030] Figure 13 Schematic diagram of working mode 1 of the present invention;

[0031] Figure 14 Schematic diagram of the second working mode of the present invention;

[0032] Figure 15 Schematic diagram of working mode 3 of the present invention;

[0033] Figure 16 Schematic diagram of working mode 4 of the present invention;

[0034] Figure 17 Schematic diagram of working mode 5 of the present invention;

[0035] Figure 18 Schematic diagram of working mode 6 of the present invention.

[0036] Reference numerals:

[0037] 1. Valve body, 2. Valve seat, 3. Lower valve seat, 4. Lower valve core, 41. Through hole, 5. Base, 6. Upper sealing gasket, 7. Upper valve seat, 8. Upper valve core, 81. Balance hole, 82. Inlay, 83. Umbrella-shaped cover, 9. Stopper, 91. Toggle piece, a. First inner layer flow hole, b. Second inner layer flow hole, c. Third inner layer flow hole, d. Fourth inner layer flow hole, e. Center flow hole, f. First outer layer flow hole, g. Second outer layer flow hole, h. Third outer layer flow hole, i. Fourth outer layer flow hole, u. Anti-rotation structure, j. Limiting protrusion, k. Limiting boss, l. First limiting groove, m. First fan-shaped cavity, s. Support column, p. Connecting channel, q. Second limiting groove, w. Second fan-shaped cavity, v. Connecting cavity, o. Guide boss. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0039] like Figure 1-18As shown, the present invention solves the problems of the existing electronic water valve being relatively large in size, relatively large in fluid resistance, and slow in response time of flow regulation, and provides the following technical solutions: a double-layer multi-way valve core structure, comprising a valve body 1, wherein a central flow hole e is provided at the center of the bottom end of the valve body 1, a plurality of inner layer flow holes are provided in a ring around the central flow hole e, and a plurality of outer layer flow holes are uniformly provided on the outer side of the inner layer flow hole along the circumference of the bottom edge of the valve body 1; a lower valve seat 3 is provided in the middle of the valve body 1 and is in close contact with the bottom of the valve body 1, a through hole corresponding to the inner layer flow hole is provided on the lower valve seat 3, and a lower sealing gasket 2 is provided between the lower valve seat 3 and the valve body 1; a lower valve core 4 is provided in the middle of the valve body 1 and is in close contact with the lower valve seat 3, a straight through hole 41 corresponding to the central flow hole e is provided in the center of the lower valve core 4, and a pair of first fan-shaped cavities m are symmetrically provided around the straight through hole 41 on the end surface of the lower valve core 4 facing the lower valve seat 3, and the position of the fan-shaped cavity m is consistent with that of the inner The flow holes of the inner and outer layers correspond to each other, and the flow between the inner and outer layer flow holes is switched by the rotation of the lower valve core 4; the base 5 is arranged inside the valve body 1 and on the outside of the lower valve core 4, and the base 5 is provided with a communication channel p corresponding to the outer layer flow hole, and an upper valve seat 7 is installed on the upper side of the base 5, and an upper sealing gasket 6 is provided between the upper valve seat 7 and the base 5; the upper valve core 8 is arranged on the upper side of the upper valve seat 7 and is in close contact with the upper valve seat 7, and the upper valve core 8 has a second fan arranged near the edge The second sector-shaped cavity w and the connecting cavity v located in the middle of the upper valve core 8 correspond to the connecting channel p. The circulation between the outer flow holes is switched by the rotation of the upper valve core 8. The center of the upper valve core 8 is provided with a support column s that passes through the upper valve seat 7, the upper sealing gasket 6 and the base 5 and is inserted into the straight hole 41. The support column s cooperates with the lower valve core 4 to drive the lower valve core 4 to rotate. The support column s is connected to the connecting cavity v and the balancing hole 81 on the side wall of the connecting cavity v. In the solution of the present invention, inner and outer flow holes are provided at the bottom of the valve body 1. The number of flow holes is large, which reduces the volume of the valve body 1. The inner flow holes are controlled by the first sector-shaped cavity m in the lower valve core 4. The outer flow holes are connected by the second sector-shaped cavity w and the connecting cavity v on the upper valve core 8. The upper valve core 8 and the lower valve core 4 can be controlled synchronously or asynchronously, thereby realizing more switching modes and reducing the number of water valves in the thermal management system.

[0040] Specifically, the inner circulation holes include a first inner circulation hole a, a second inner circulation hole b, a third inner circulation hole c, and a fourth inner circulation hole d arranged in a circular pattern. The outer circulation holes include a first outer circulation hole f, a second outer circulation hole g, a third outer circulation hole h, and a fourth outer circulation hole i. The four inner circulation holes, four outer circulation holes, and the center circulation hole e form a nine-hole circulation structure. The center circulation hole e is a normally open hole and is connected to the balancing hole 81. Therefore, during operation, the valve body is filled with coolant, maintaining internal coolant pressure balance.

[0041] The first inner layer circulation hole a, the second inner layer circulation hole b, the third inner layer circulation hole c and the fourth inner layer circulation hole d are located on the same annular band, that is, the first inner layer circulation hole a, the second inner layer circulation hole b, the third inner layer circulation hole c and the fourth inner layer circulation hole d are equidistant from the central circulation hole e; the first inner layer circulation hole a, the second inner layer circulation hole b, the third inner layer circulation hole c and the fourth inner layer circulation hole d and the central circulation hole e are distributed in a cross shape. The first outer layer flow holes f, the second outer layer flow holes g, the third outer layer flow holes h, and the fourth outer layer flow holes i are located in the same annular zone, i.e., the first outer layer flow holes f, the second outer layer flow holes g, the third outer layer flow holes h, and the fourth outer layer flow holes i are equidistant from the central flow hole e, and the annular zone of the first outer layer flow holes f, the second outer layer flow holes g, the third outer layer flow holes h, and the fourth outer layer flow holes i is located outside the annular zone of the first inner layer flow holes a, the second inner layer flow holes b, the third inner layer flow holes c, and the fourth inner layer flow holes d. The first outer layer flow holes f, the second outer layer flow holes g, the third outer layer flow holes h, the fourth outer layer flow holes i, and the central flow hole e are also arranged in a cross shape. The inner layer flow holes have no angular relationship with the outer layer flow holes, i.e., any hole in the outer layer flow holes can be on the same diameter as any hole in the outer layer flow holes, or at any angle. In this embodiment, the inner layer flow holes and the outer layer flow holes can be staggered at a 45° angle.

[0042] In this embodiment, at least one first limiting groove I is provided on the outer edge of the lower valve seat 3, a groove corresponding to the shape of the lower valve seat 3 is provided on the inner bottom surface of the valve body 1, and a limiting protrusion j corresponding to the first limiting groove I is provided on the side wall of the groove. The anti-rotation positioning and precise installation of the lower valve seat 3 can be achieved by mutual engagement between the limiting protrusion j and the first limiting groove I.

[0043] At the same time, at least one second limiting groove q is provided on the edges of the upper valve seat 7, the base 5 and the upper sealing gasket 6, and a limiting boss k is provided on the inner side wall of the valve body 1 to match the second limiting groove q. The relative positions of the upper valve seat 7, the base 5 and the upper sealing gasket 6 can be limited at the same time through the clamping connection between the limiting boss k and the second limiting groove q, thereby preventing the upper valve seat 7 and the base 5 from moving when the upper valve core 8 rotates.

[0044] A circle of guide bosses o is provided on the lower end surface of the lower valve core 4 around the straight through hole 41, and the guide bosses o are embedded in the central hole of the lower valve seat 3. Such a structure can prevent the lower valve core 4 and the lower valve seat 3 from deviating and ensure their sealing.

[0045] In addition, an anti-rotation structure u is provided on the outer side of the support column s, and a stopper 9 is provided on the outer side of the support column s to cooperate with the anti-rotation structure u. A toggle piece 91 is radially extended from the outer wall of the stopper 9. The toggle piece 91 cooperates with the limiting arc groove n on the side wall of the straight hole 41 of the lower valve core 4. The anti-rotation structure u cooperates with the stopper 9 to realize the installation of the stopper 9, and the stopper 9 can drive the lower valve core 4 to rotate, thereby realizing the synchronous movement between the upper valve core 8 and the lower valve core 4. In this embodiment, the stopper 9 is cylindrical and hollow inside. The anti-rotation structure u on its outer side can be set in a spline shape, and the arc angle of the toggle piece 91 on the outer side of the stopper 9 is smaller than the arc angle of the limiting arc groove n. When one end of the toggle piece 91 is against one end of the limiting arc groove n, the support column s can drive the lower valve core 4 to rotate, so that the rotation between the support column s and the lower valve core 4 has a delayed effect.

[0046] In this embodiment, the upper end port of the connecting channel p corresponding to the third outer layer circulation hole h and the first outer layer circulation hole f is a waist-shaped port, the upper end port of the connecting channel p corresponding to the second outer layer circulation hole g and the fourth outer layer circulation hole i is a round port, the connecting channel p corresponding to the third outer layer circulation hole h and the first outer layer circulation hole f corresponds to the second fan-shaped cavity w, and the connecting channel p corresponding to the second outer layer circulation hole g and the fourth outer layer circulation hole i corresponds to the connecting cavity v. The nine-hole circulation structure can realize the switching of six working modes. The connecting channel p corresponding to the third outer layer circulation hole h and the first outer layer circulation hole f is L-shaped as a whole, so that the connecting channel p can be connected to the second fan-shaped cavity w. The connecting channel p not only has the function of a circulation channel, but also has the function of support, so that the upper valve core 8 can be set on the upper side of the lower valve core 4.

[0047] In addition, the interior of the base 5 is provided with an elastic member 11 which is sleeved on the outside of the support column s. The lower end of the elastic member 11 is against the lower valve core 4. The elastic member 11 can apply a downward force to the lower valve core 4 to improve the sealing between the lower valve core 4 and the lower valve seat 3. A spring gasket 10 can be installed at the lower end of the elastic member 11.

[0048] As a specific embodiment of the upper valve core 8, the upper valve core 8 includes an umbrella-shaped cover body 83 and an inlay 82 embedded in the middle of the umbrella-shaped cover body 83, the support column s is a part of the inlay 82, the connecting cavity v is surrounded by the umbrella-shaped cover body 83 and the inlay 82, and the balance hole 81 is arranged at the upper end of the inlay 82. The use of the inlay 82 can improve the overall strength of the upper valve core 8, and can also improve the strength of the connection between the upper valve core 8 and the lower valve core 4, and the structure of the umbrella-shaped cover body 83 and the inlay 82 is easier to process and produce.

[0049] In this embodiment, there are 6 modes, the rotation angle of the upper valve core 8 is 0° to 325°, and the valve core angle is at 0° at the beginning. Figure 13-18 As shown in Table 1 below:

[0050] Table 1: Working mode diagram

[0051]

[0052]

[0053] Among them, ad, cd, fe and hi in the table mean that different flow holes are connected. For example, ad means that the first inner layer flow hole a is connected to the fourth inner layer flow hole d. Working modes 1 to 6 correspond to the attached Figure 13-18 .

[0054] In this embodiment, the water valve can adopt the above-mentioned valve core structure. When the water valve starts working, the upper valve core 8 rotates under the drive of the motor, so that different flow channels are connected to reach the preset mode. The circulating medium flows in from the preset inlet flow channel, and the flow direction and flow rate of different flow channels are adjusted under the flow channel mode switching of the upper valve core 8 and the lower valve core 4, and then flows out from the outlet flow channel, ultimately achieving the temperature regulation function of the thermal management system.

[0055] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0056] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being described. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0057] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0058] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A double-layer multi-way valve core structure, characterized in that: include: A valve body (1), wherein a central flow hole (e) is provided at the center of the bottom end of the valve body (1), a plurality of inner flow holes are provided in an annular pattern around the central flow hole (e), and a plurality of outer flow holes are evenly provided outside the inner flow hole along the circumference of the bottom edge of the valve body (1); A lower valve seat (3) is arranged in the middle of the valve body (1) and is in close contact with the bottom of the valve body (1); a through hole corresponding to the inner layer flow hole is provided on the lower valve seat (3); and a lower sealing gasket (2) is provided between the lower valve seat (3) and the valve body (1); A lower valve core (4) is arranged in the middle of the valve body (1) and is in close contact with the lower valve seat (3); a straight hole (41) corresponding to the central flow hole (e) is provided at the center of the lower valve core (4); a pair of first fan-shaped cavities (m) are symmetrically provided around the straight hole (41) on the end surface of the lower valve core (4) facing the lower valve seat (3); the positions of the fan-shaped cavities (m) correspond to the inner layer flow holes, and the flow between the inner layer flow holes is switched by the rotation of the lower valve core (4); A base (5) is arranged inside the valve body (1) and outside the lower valve core (4), the base (5) is provided with a communication channel (p) corresponding to the outer layer flow hole, an upper valve seat (7) is installed on the upper side of the base (5), and an upper sealing gasket (6) is provided between the upper valve seat (7) and the base (5); An upper valve core (8) is arranged on the upper side of the upper valve seat (7) and is in close contact with the upper valve seat (7). The upper valve core (8) has a second fan-shaped cavity (w) arranged near the edge and a connecting cavity (v) located in the middle of the upper valve core (8). The second fan-shaped cavity (w) and the connecting cavity (v) correspond to the connecting channel (p). The circulation between the outer flow holes is switched by the rotation of the upper valve core (8). A support column (s) is provided in the center of the upper valve core (8) and is inserted into the straight hole (41) through the upper valve seat (7), the upper sealing gasket (6) and the base (5). The support column (s) cooperates with the lower valve core (4) to drive the lower valve core (4) to rotate. The support column (s) is connected to the connecting cavity (v) and the balance hole (81) on the side wall of the connecting cavity (v); The base (5) is provided with an elastic member (11) sleeved on the outside of the support column (s), and the lower end of the elastic member (11) abuts against the lower valve core (4); The upper valve core (8) includes an umbrella-shaped cover body (83) and an inlay (82) embedded in the middle of the umbrella-shaped cover body (83), the support column (s) is a part of the inlay (82), the connecting cavity (v) is surrounded by the umbrella-shaped cover body (83) and the inlay (82), and the balancing hole (81) is arranged at the upper end of the inlay (82).

2. The double-layer multi-way valve core structure according to claim 1, characterized in that: The inner layer circulation holes include a first inner layer circulation hole (a), a second inner layer circulation hole (b), a third inner layer circulation hole (c) and a fourth inner layer circulation hole (d) arranged in a ring shape, and the outer layer circulation holes include a first outer layer circulation hole (f), a second outer layer circulation hole (g), a third outer layer circulation hole (h) and a fourth outer layer circulation hole (i).

3. The double-layer multi-way valve core structure according to claim 2, characterized in that: The upper end port of the connecting channel (p) corresponding to the third outer layer circulation hole (h) and the first outer layer circulation hole (f) is a waist-shaped port, the upper end port of the connecting channel (p) corresponding to the second outer layer circulation hole (g) and the fourth outer layer circulation hole (i) is a round port, the connecting channel (p) corresponding to the third outer layer circulation hole (h) and the first outer layer circulation hole (f) corresponds to the second fan-shaped cavity (w), and the connecting channel (p) corresponding to the second outer layer circulation hole (g) and the fourth outer layer circulation hole (i) corresponds to the connecting cavity (v).

4. The double-layer multi-way valve core structure according to claim 1, characterized in that: The outer side of the support column (s) is provided with an anti-rotation structure (u), and the outer side of the support column (s) is provided with a stopper (9) that cooperates with the anti-rotation structure (u). A toggle plate (91) is radially extended from the outer side wall of the stopper (9), and the toggle plate (91) cooperates with a limiting arc groove (n) on the side wall of the straight hole (41) of the lower valve core (4).

5. The double-layer multi-way valve core structure according to claim 1, characterized in that: The outer edge of the lower valve seat (3) is provided with at least one first limiting groove (I), the inner bottom surface of the valve body (1) is provided with a groove corresponding to the shape of the lower valve seat (3), and the side wall of the groove is provided with a limiting protrusion (j) corresponding to the first limiting groove (I).

6. The double-layer multi-way valve core structure according to claim 5, characterized in that: At least one second limiting groove (q) is provided on the edges of the upper valve seat (7), the base (5) and the upper sealing gasket (6), and a limiting boss (k) matching the second limiting groove (q) is provided on the inner side wall of the valve body (1).

7. The double-layer multi-way valve core structure according to claim 1, characterized in that: A circle of guide bosses (o) is provided on the lower end surface of the lower valve core (4) around the straight through hole (41), and the guide bosses (o) are embedded in the central hole of the lower valve seat (3).

8. A water valve, characterized in that: It comprises the double-layer multi-way valve core structure as described in any one of claims 1 to 7.

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