Thermal management valve with double-ball-valve structure

Abstract

The invention discloses a thermal management valve with a double-ball-valve structure, which comprises a valve body, a double-ball-valve assembly and an electric control driver, the valve body is provided with a bypass water path, a first large circulation water path, a second large circulation water path, a small circulation water path and a liquid buffer water path, the double-ball-valve assembly comprises a first valve ball and a second valve ball, and when the valve is in a closing position, the first valve ball and the second valve ball are closed. The first and second large circulating waterways are simultaneously closed, the small circulating waterway is fully opened, and the bypass waterway is fully opened; when the valve is located at a 90-degree opening position, the first large circulating water path and the second large circulating water path are fully opened, the small circulating water path is closed under the condition that bypass quantity is reserved, and the bypass water path is fully opened; when the valve is in a 180-degree opening position, the first large circulation water path and the second large circulation water path are fully opened, and the small circulation water path and the bypass water path are closed under the condition that the bypass amount is reserved. According to the valve, the flow control valve of the hydraulic retarder and the thermostat valve of the engine cooling system are integrally arranged, so that the arrangement space of an engine is saved, and the reliability of the engine is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal management valves, and in particular to a thermal management valve with a double ball valve structure capable of controlling large and small cycles of an engine cooling system and performing thermal management on a hydraulic retarder. Background Art

[0002] The hydraulic retarder, also known as the hydraulic deceleration device, is an important auxiliary braking system in the automobile transmission system. It can effectively reduce the driving speed, reduce the wear of the brakes, greatly reduce the possibility of brake failure, and effectively ensure the driving safety of the vehicle. At the same time, it also has the advantages of large high-speed braking torque, stable braking, low noise, long life and small size. Its excellent braking performance is gradually being accepted and recognized by more and more users. Although the domestic hydraulic retarder has just started, from the experience of Europe, the hydraulic retarder has huge advantages over the eddy current retarder, and it is an inevitable trend to replace it.

[0003] When the hydraulic retarder is working, the control gas enters the oil pool housing through the control valve, and presses the retarder oil with a lower temperature in the oil pool housing into the working chamber housing through the one-way valve at the upper oil inlet, and fills the working chamber space between the stator and the rotor and around it. In the working chamber, due to the high-speed rotation of the rotor, the oil generates centrifugal force and impacts the stator blades, and the stator blades generate an opposite force on the rotating oil, which is the braking torque of the hydraulic retarder. The braking torque is transmitted to the output shaft of the gearbox through the gear transmission mechanism, thereby achieving the purpose of braking and deceleration of the transmission system. At the same time, the mechanical energy of the gearbox output shaft is converted into thermal energy, the oil is heated and the oil temperature rises. The high-temperature oil rotating in the hydraulic retarder enters the heat exchanger through the oil outlet below under the action of centrifugal force. The coolant flow channel and the brake oil flow channel inside the heat exchanger are arranged alternately. The coolant from the whole vehicle and the flowing high-temperature oil take away the heat through the heat exchanger, the coolant temperature rises, and the oil is pressed into the oil pool shell after being cooled, ensuring the continuity of the braking work. However, the existing hydraulic retarder has the following problems:

[0004] (1) At present, in order to ensure the cooling performance of the hydraulic retarder, heavy trucks usually use the main water circuit of the engine cooling system to cool the hydraulic retarder, that is, after cooling the engine cylinder block and cylinder head, the hydraulic retarder is cooled, and finally the temperature returns to the thermostat. The installation position of the hydraulic retarder is at the rear end of the heavy truck transmission, which is usually 1m to 1.5m away from the engine. In order to provide coolant to the hydraulic retarder, the heavy truck cooling system usually needs to extend two pipes by 1m to 1.5m, resulting in a long coolant circulation pipeline and too high heat dissipation capacity. In winter, it will cause the coolant temperature of heavy trucks to be low and the warm-up speed to be slow.

[0005] (2) The heat generated by the hydraulic retarder during braking varies greatly, and the heat dissipation conditions of the entire vehicle also vary greatly (ambient temperature, headwind speed). As a result, the cooling system of the entire vehicle cannot dissipate heat for the hydraulic retarder in the same fixed mode. For example, in winter and summer, under high speed conditions and low speed conditions, the control requirements for the cooling system are completely opposite. The existing solutions are to increase the heat dissipation capacity of the cooling system, which reduces the thermal efficiency of the entire vehicle and causes the coolant temperature of the entire vehicle to be low in winter when the vehicle speed is high and the headwind is strong.

[0006] (3) The engine cooling system consists of a radiator, a water pump, a thermostat, a cooling water jacket in the cylinder block and cylinder head, and its ancillary devices. There are two circulation routes for the coolant in the cooling system, which are commonly known as the large circulation and the small circulation. The small circulation means that the coolant circulates only in the water channel inside the engine, while the large circulation means that the coolant must pass through the radiator outside the engine, that is, the water tank, during the circulation process. The switching of the two circulation modes is completed by the thermostat. When the thermostat is closed, the small circulation is carried out, and vice versa, the large circulation is carried out. In the prior art, the hydraulic retarder flow control valve and the thermostatic valve are separately arranged, which makes the precious engine layout space more crowded, and requires two sets of controllers to control them separately, which increases the failure rate. Summary of the invention

[0007] In view of this, the technical problem to be solved by the present invention is to provide a thermal management valve with a double ball valve structure, which integrates the flow control valve of the hydraulic retarder and the thermostatic valve of the engine cooling system, and uses the same electronic control driver, thereby saving the layout space of the engine and improving the reliability of the engine.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is: a thermal management valve with a double ball valve structure, comprising: a valve body, a ball valve and an electronically controlled driver, the valve body is provided with a water inlet, a large circulation water outlet, a small circulation water outlet, a liquid buffer water supply port and a liquid buffer water return port which are respectively connected to the outside world, a valve cavity is provided in the valve body, the ball valve is arranged in the valve body and is transmission-connected to the electronically controlled driver; the valve cavity is provided with a bypass hole, a small circulation water outlet hole, a first large circulation water outlet hole, a second large circulation water outlet hole, a top mounting hole and a bottom water return hole, the bypass hole is connected with the water inlet through a bypass flow channel to form a bypass waterway, the first large circulation water outlet hole is connected with the large circulation water outlet to form The first large circulation water circuit, the second large circulation water outlet hole is connected with the large circulation water outlet to form the second large circulation water circuit, the small circulation water outlet hole is connected with the small circulation water outlet through the small circulation flow channel to form the small circulation water circuit, the water inlet is connected with the liquid slow water supply port through the liquid slow water supply flow channel to form the liquid slow water supply circuit, the liquid slow water return port is connected with the bottom water return hole through the liquid slow water return flow channel to form the liquid slow water return circuit, the liquid slow water supply circuit and the liquid slow water return circuit together form the liquid slow water circuit, the first large circulation water outlet hole is provided with a first dynamic sealing device, and the second large circulation water outlet hole is provided with a second dynamic sealing device; the ball valve is a double ball valve assembly, and the double ball valve assembly includes a rotating shaft and upper and lower arranged The first valve ball and the second valve ball, the first valve ball and the second valve ball have a valve ball channel with an open bottom and a through inner cavity, the first valve ball is circumferentially provided with a first port connected to the valve ball channel, and the rest is a first valve ball sealing part, the second valve ball is circumferentially provided with a second port and a third port respectively connected to the valve ball channel, a second valve ball sealing part is arranged between the second port and the third port, the rotating shaft is fixedly arranged with the first valve ball and the second valve ball and passes through the valve ball channel; when the thermal management valve is in the closed position, the first valve ball sealing part cooperates with the first dynamic sealing device to close the first large circulation water circuit, and the second valve ball sealing part cooperates with the second dynamic sealing device to close the first large circulation water circuit The sealing device cooperates to close the second large circulation water circuit, the small circulation water outlet hole is communicated with the second port, the small circulation water circuit is fully opened, the bypass hole is communicated with the first port, and the bypass water circuit is fully opened; when the thermal management valve is in the 90° opening position, the first large circulation water outlet hole is communicated with the first port, the first large circulation water circuit is fully opened, the second large circulation water outlet hole is communicated with the third port, the second large circulation water circuit is fully opened, the small circulation water outlet hole is blocked by the second valve ball sealing part in the circumferential direction, the small circulation water circuit is closed under the condition of retaining the bypass amount (of course, the small circulation water circuit can also be completely closed), the bypass hole is communicated with the first port, and the bypass water circuit is fully opened;When the thermal management valve is in the 180° open position, the first large circulation water outlet hole is connected to the first port, the first large circulation water circuit is fully open, the second large circulation water outlet hole is connected to the second port, the second large circulation water circuit is fully open, the small circulation water outlet hole is blocked by the second valve ball sealing part in the circumferential direction, the small circulation water circuit is closed under the condition of retaining the bypass amount (of course, the small circulation water circuit can also be completely closed), the bypass hole is blocked by the first valve ball sealing part, and the bypass water circuit is closed under the condition of retaining the bypass amount (of course, the bypass water circuit can also be completely closed). ;

[0009] Wherein, the second port and the third port are vertically arranged.

[0010] Wherein, the first valve ball and the second valve ball are integrally formed.

[0011] Among them, one end of the rotating shaft is rotatably mounted on the top cover and is transmission-connected to the output end of the electronically controlled driver, and the other end is rotatably mounted on the return water bracket. The top cover is fixed to the top mounting hole, and the return water bracket is fixed to the bottom return water hole. The return water bracket is provided with a water-permeable hole.

[0012] Wherein, a closed first end cover is arranged on the top of the first valve ball, a hollow second end cover is arranged on the bottom of the second valve ball, and the rotating shaft is fixedly connected to the first end cover and the second end cover respectively.

[0013] The first end cover and the first valve ball are integrally arranged, and the second end cover and the second valve ball are separately arranged.

[0014] After adopting the above technical solution, the present invention achieves the following technical effects:

[0015] The thermal management valve with a double ball valve structure disclosed by the present invention has a double ball valve, one of which is mainly used to control the large and small circulating water, and the other is mainly used to control the flow of the hydraulic retarder, and the two valve balls are connected through the valve ball channel. The setting of the opening ensures that the function of each ball valve can be covered and will not interfere with each other, that is, the two ball valves support each other in function and have an interactive relationship. When the engine cooling system is in a large circulation state and the hydraulic retarder is in a braking state, corresponding to the 180° opening position of the present invention, the two ball valves are opened at the same time, the large circulating water is fully opened, and the bypass waterway is closed or closed while retaining a certain bypass amount. Compared with a thermal management valve with one ball valve, the flow rate is increased and the cooling effect is improved; when the engine cooling system is in a large circulation state and the hydraulic retarder is in a non-braking state, corresponding to the 90° opening position of the present invention, the two ball valves are still opened at the same time, the large circulating water is fully opened, but the bypass waterway is opened. Since the hydraulic retarder waterway is generally long and has a large flow resistance, the opening of the bypass waterway When the hydraulic retarder is opened, the flow rate flowing through the hydraulic retarder is significantly reduced, thereby adapting to the non-braking state of the hydraulic retarder and meeting the large circulation water demand of other components of the engine cooling system; if the hydraulic retarder is in the non-braking state and the entire engine cooling system is also in a low load state (for example, a cold machine state), corresponding to the closed position of the present invention, the two ball valves are closed at the same time, that is, the first large circulation water circuit and the first large circulation water circuit are closed at the same time, and the bypass water circuit is opened, and the small circulation water circuit is opened, so that the hydraulic retarder and the entire cooling system are in a small circulation state, avoiding the problems of low coolant temperature and slow warm-up speed.

[0016] In the present invention, an electronically controlled driver is adopted. According to different working conditions (vehicle temperature, vehicle speed, etc.), different algorithms are used to control the corresponding positions of the openings of the two ball valves and the corresponding water outlets, and the flow rate is fine-tuned, thereby realizing refined management of engine heat.

[0017] In summary, the thermal management valve disclosed in the present invention integrates the flow control valve of the hydraulic retarder and the thermostatic valve of the engine cooling system and is controlled by the same electronically controlled driver, which saves the layout space of the engine and improves the reliability of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 2 is a schematic diagram of the three-dimensional structure of an embodiment of a thermal management valve with a double ball valve structure according to the present invention;

[0019] Figure 2 yes Figure 1 A longitudinal cross-sectional view of the illustrated embodiment in the 90° open position;

[0020] Figure 3 yes Figure 2 Sectional view at AA in the middle;

[0021] Figure 4 yes Figure 2 Sectional view at CC;

[0022] Figure 5 yes Figure 2 Sectional view at DD in the middle;

[0023] Figure 6 yes Figure 1 The embodiment shown is in the 180° open position at a position equivalent to Figure 2 Sectional view at CC;

[0024] Figure 7 middle Figure 1 The embodiment shown is in the 180° open position at a position equivalent to Figure 2 Sectional view at DD in the middle;

[0025] Figure 8 yes Figure 1 The embodiment shown in the closed position is equivalent to Figure 2 Sectional view at CC;

[0026] Fig. 9 middle Figure 1 The embodiment shown in the closed position is equivalent to Figure 2 Sectional view at DD in the middle;

[0027] Fig.10 yes Figure 1 The embodiment shown in the figure is in the equivalent of Figure 2 Sectional view at CC;

[0028] Fig.11 middle Figure 1 The embodiment shown in the figure is in the equivalent of Figure 2 Sectional view at DD in the middle;

[0029] Fig.12 yes Figure 1 A corresponding relationship diagram of the opening area of ​​each hole in the valve cavity and the rotation angle of the ball valve in the embodiment shown;

[0030] In the figure: 1, valve body; 11, water inlet; 12, small circulation water outlet; 13, liquid slow water supply port; 14, liquid slow water return port; 15, large circulation water outlet; 21, first valve ball; 211, first port; 212, first valve ball sealing part; 213, first end cover; 22, second valve ball; 221, second valve ball sealing part; 222, second port; 223, third port; 224, second end cover; 23, rotating shaft ; 3. Electronically controlled driver; 4. Top cover; 5. Return bracket; 6. First dynamic sealing device; 7. Second dynamic sealing device; 8. Third dynamic sealing device; 9. Sealing ring; Q. Valve chamber; Q1. Bypass hole; Q2. Small circulation water outlet hole; Q3. First large circulation water outlet hole; Q4. Second large circulation water outlet hole; R1. Bypass flow channel; R2. Small circulation flow channel; R3. Liquid slow water supply flow channel; R4. Liquid slow water return flow channel. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0032] like Figure 1 As shown, a thermal management valve with a double ball valve structure, the valve body 1 is provided with a water inlet 11, a large circulation water outlet 15 and a small circulation water outlet 12 which are respectively connected to the engine cooling system, the valve body 1 is also provided with a hydraulic retarder water supply port 13 and a hydraulic retarder water return port 14 which are respectively connected to the hydraulic retarder, the direction of the arrow in the figure represents the direction of water flow, and "water" refers to the coolant of the engine cooling system.

[0033] like Figure 2 and Figure 3 As shown, a valve cavity Q is arranged in the valve body 1, a ball valve is arranged in the valve body Q and is in driving connection with the electric control driver 3, a bypass hole Q1, a small circulation water outlet hole Q2, a first large circulation water outlet hole Q3, a second large circulation water outlet hole Q4, a top mounting hole and a bottom water return hole are opened in the valve cavity Q, the bypass hole Q1 is connected with the water inlet 11 through the bypass flow channel R1 to form a bypass waterway, the first large circulation water outlet hole Q3 is connected with the large circulation water outlet 15 to form the first large circulation waterway, the second large circulation water outlet hole Q4 is connected with the large circulation water outlet 16 to form the first large circulation waterway, and the second large circulation water outlet hole Q5 is connected with the large circulation water outlet 17 to form the first large circulation waterway. The water outlet 15 is connected to form the second large circulation water circuit, the small circulation water outlet hole Q2 is connected to the small circulation water outlet 12 through the small circulation flow channel R2 to form a small circulation water circuit, the water inlet 11 is connected to the liquid slow supply water port 13 through the liquid slow supply water channel R3 to form a liquid slow supply water circuit, the liquid slow return water port 14 is connected to the bottom water return hole through the liquid slow return water channel R4 to form a liquid slow return water circuit, the liquid slow supply water circuit and the liquid slow return water circuit together form a liquid slow water circuit, generally speaking, the liquid slow water circuit is longer and has greater liquid resistance. The first large circulation water outlet hole Q3 is provided with a first dynamic sealing device 6, and the second large circulation water outlet hole Q4 is provided with a second dynamic sealing device 7. The first dynamic sealing device 6 and the second dynamic sealing device 7 can be single-stage or multi-stage dynamic sealing structures such as skeleton sealing rings.

[0034] The ball valve is a double ball valve assembly, which includes a rotating shaft 23 and a first valve ball 21 and a second valve ball 22 arranged up and down. Preferably, the first valve ball 21 and the second valve ball 22 are integrally formed. The first valve ball 21 and the second valve ball 22 have a valve ball channel with an open bottom and a through inner cavity. The first valve ball 21 is provided with a first port 211 in the circumferential direction, which is communicated with the valve ball channel, and the rest is a first valve ball sealing portion 212. The second valve ball 22 is provided with a second port 222 and a third port 223 in the circumferential direction, which are respectively communicated with the valve ball channel. A second valve ball sealing portion 221 is provided between the second port 222 and the third port 223. Preferably, the second port 222 and the third port 223 are arranged vertically. A closed first end cover 213 is provided on the top of the first valve ball 21, and a hollow second end cover 224 is provided on the bottom of the second valve ball 22. For ease of installation, the first end cover 213 is integrally arranged with the first valve ball 21, the second end cover 224 is separately arranged with the second valve ball 22, and the rotating shaft 23 passes through the valve ball channel and is fixedly connected to the first end cover 213 and the second end cover 224 respectively. One end of the rotating shaft 23 is rotatably mounted on the top cover 4 and is transmission-connected to the output end of the electric control driver 3, the top cover 4 is fixed to the top mounting hole, and the other end of the rotating shaft 23 is rotatably mounted on the return water bracket 5, the return water bracket 5 is fixed to the bottom return water hole, and the return water bracket 5 is provided with a water-permeable hole, so that the liquid retarder waterway is always connected to the hydraulic retarder. In order to improve the sealing performance, a third dynamic sealing device 8 is provided between the rotating shaft 23 and the top cover 4, and a sealing ring 9 is provided between the top cover 4 and the valve body 1.

[0035] like Figure 8 and Fig. 9 As shown, when the thermal management valve is in the closed position, the first valve ball sealing part 212 cooperates with the first dynamic sealing device 6 to close the first large circulating water circuit, the second valve ball sealing part 221 cooperates with the second dynamic sealing device 7 to close the second large circulating water circuit, the small circulating water outlet hole Q2 is connected to the second port 222, the small circulating water circuit is fully open, the bypass hole Q1 is connected to the first port 211, and the bypass water circuit is fully open. This working position corresponds to the hydraulic retarder being in a non-braking state and the entire engine cooling system being in a low-load state (for example, a cold machine state).

[0036] like Figure 4 and Figure 5As shown, when the thermal management valve is in the 90° open position, the first large circulation water outlet hole Q3 is connected to the first port 211, and the first large circulation water circuit is fully open. The second large circulation water outlet hole Q4 is connected to the third port 223, and the second large circulation water circuit is fully open. The small circulation water outlet hole Q2 is blocked by the second valve ball sealing part 221 in the circumferential direction, and the small circulation water circuit is closed while retaining the bypass volume. The bypass hole Q1 is connected to the first port 211, and the bypass water circuit is fully open. This working position corresponds to the engine cooling system being in a large circulation state and the hydraulic retarder being in a non-braking state. The so-called "bypass volume" is similar to the state of a valve not being tightly sealed, from Figure 5 It can be seen that the second valve ball sealing part 221 and the small circulation water outlet hole Q2 have a flow gap in the radial direction. The advantage of retaining a certain amount of bypass is that the engine cooling system and the heat dissipation pipeline of the hydraulic retarder can be filled with coolant. Of course, it is also possible to set a sealing device so that the small circulation water outlet hole Q2 is completely closed by the second valve ball sealing part 221 in the circumferential direction. At this time, the small circulation water circuit is closed and there is no bypass. This structure can make the control of the thermal management valve more precise, but the feedback adjustment of the electronic control driver is relatively frequent.

[0037] like Figure 6 and Figure 7 As shown, when the thermal management valve is in the 180° open position, the first large circulation water outlet hole Q3 is connected to the first port 211, the first large circulation water circuit is fully open, the second large circulation water outlet hole Q4 is connected to the second port 222, the second large circulation water circuit is fully open, the small circulation water outlet hole Q2 is blocked by the second valve ball sealing part 221 in the circumferential direction, the small circulation water circuit is closed under the condition of retaining the bypass amount, the bypass hole Q1 is blocked by the first valve ball sealing part 212, the bypass water circuit is closed under the condition of retaining the bypass amount, and this working position corresponds to the engine cooling system being in the large circulation state and the hydraulic retarder being in the braking state. Similarly, by setting a sealing device, the small circulation water outlet hole Q2 can be completely closed by the second valve ball sealing part 221 in the circumferential direction. At this time, the small circulation water circuit is closed, and the bypass hole Q1 is completely closed by the first valve ball sealing part 211. At this time, the bypass water circuit is closed and there is no bypass amount. The role of the bypass amount is as described above and will not be repeated here.

[0038] In addition, if Fig.10 and Fig.11 As shown, according to different working conditions (ambient temperature, vehicle speed, headwind speed, etc.), the openings of the two ball valves and the corresponding positions of the corresponding water outlets can be controlled by the electronically controlled driver 3 using different algorithms to fine-tune the flow rate, thereby achieving refined management of the engine heat. Fig.10 and Fig.11 Shown is the angle state of the ball valve after adjustment corresponding to a certain working condition.

[0039] In this embodiment, in order to optimize the settings of the various openings of the ball valves and ensure that the functions of each ball valve can be covered and will not interfere with each other, a certain relationship must be met: Fig.12 The corresponding relationship diagram of the opening area of ​​the first large circulation water outlet hole, the second large circulation water outlet hole, the small circulation water outlet hole, and the bypass hole as the rotation angle of the thermal management valve changes is shown. Fig.12 The change law reflected can determine the size and relative position of each opening on the double ball valve. This change law is reflected in Figures 4 to 11 The size, shape and position of the ball valve opening corresponding to the thermal management valve in various working states are shown in the figure. For ease of understanding, Fig.12 The bypass volume when each opening is closed is neglected.

[0040] In summary, the contribution of the present invention to the prior art is mainly reflected in the integrated setting of the flow control valve of the hydraulic retarder and the thermostatic valve of the engine cooling system, wherein one ball valve is mainly used to control the large and small circulating water, and the other ball valve is mainly used to control the flow of the hydraulic retarder. The flow control is achieved by opening and closing the bypass waterway, and the two valve balls are connected through the valve ball channel. When large circulating water is required, the two ball valves are opened at the same time. At the same time, the ball valve opening adopts a more reasonable setting to ensure that the function of each ball valve can be covered and will not interfere with each other. It can be seen that the double ball valves of the present invention support each other in function and have an interactive relationship, rather than a simple superposition of the two ball valves in quantity. Based on the above structure, the present invention realizes the control of the double ball valves with the same electric control driver, which saves the layout space of the engine and improves the reliability of the engine.

[0041] The present invention is not limited to the above embodiments, and all improvements based on the concept, principle, structure and method of the present invention will fall within the protection scope of the present invention.

Claims

1. A thermal management valve with a double ball valve structure, comprising: A valve body, a ball valve and an electric control driver, wherein the valve body is provided with a water inlet, a large circulation water outlet and a small circulation water outlet respectively connected to the outside, a valve cavity is provided in the valve body, the ball valve is arranged in the valve body and is transmission-connected to the electric control driver, characterized in that: The valve body is also provided with a hydraulic retarder water supply port and a hydraulic retarder water return port connected to the hydraulic retarder, the valve cavity is provided with a bypass hole, a small circulation water outlet hole, a first large circulation water outlet hole, a second large circulation water outlet hole, a top mounting hole and a bottom water return hole, the bypass hole is connected with the water inlet through a bypass flow channel to form a bypass waterway, the first large circulation water outlet hole is connected with the large circulation water outlet to form a first large circulation waterway, and the second large circulation water outlet hole is connected with the large circulation water outlet to form a second large circulation waterway The small circulation water outlet hole is connected with the small circulation water outlet through the small circulation flow channel to form a small circulation water circuit, the water inlet is connected with the liquid slow water supply port through the liquid slow water supply flow channel to form a liquid slow water supply circuit, the liquid slow water return port is connected with the bottom water return hole through the liquid slow water return flow channel to form a liquid slow water return circuit, the liquid slow water supply circuit and the liquid slow water return circuit together form a liquid slow water circuit, the first large circulation water outlet hole is provided with a first dynamic sealing device, and the second large circulation water outlet hole is provided with a second dynamic sealing device; The ball valve is a double-ball valve assembly, which includes a rotating shaft and a first valve ball and a second valve ball arranged up and down, the first valve ball and the second valve ball having a valve ball passage with an open bottom and a through inner cavity, the first valve ball having a first port in the circumferential direction connected to the valve ball passage, and the rest of the first valve ball being a first valve ball sealing portion, the second valve ball having a second port and a third port in the circumferential direction connected to the valve ball passage respectively, a second valve ball sealing portion being arranged between the second port and the third port, the rotating shaft being fixedly arranged with the first valve ball and the second valve ball and passing through the valve ball passage; When the thermal management valve is in the closed position, the first valve ball sealing part cooperates with the first dynamic sealing device to close the first large circulation water circuit, the second valve ball sealing part cooperates with the second dynamic sealing device to close the second large circulation water circuit, the small circulation water outlet hole is connected with the second port, the small circulation water circuit is fully opened, the bypass hole is connected with the first port, and the bypass water circuit is fully opened; When the thermal management valve is in the 90° open position, the first large circulation water outlet hole is connected to the first port, the first large circulation water circuit is fully open, the second large circulation water outlet hole is connected to the third port, the second large circulation water circuit is fully open, the small circulation water outlet hole is blocked by the second valve ball sealing part in the circumferential direction, the small circulation water circuit is closed while retaining the bypass amount, the bypass hole is connected to the first port, and the bypass water circuit is fully open; When the thermal management valve is in the 180° open position, the first large circulation water outlet hole is connected to the first port, the first large circulation water circuit is fully open, the second large circulation water outlet hole is connected to the second port, the second large circulation water circuit is fully open, the small circulation water outlet hole is blocked circumferentially by the second valve ball sealing part, the small circulation water circuit is closed while retaining the bypass amount, the bypass hole is blocked by the first valve ball sealing part, and the bypass water circuit is closed while retaining the bypass amount.

2. The thermal management valve with a double ball valve structure according to claim 1, characterized in that: When the thermal management valve is in the 90° open position, the small circulation water outlet hole is closed in the circumferential direction by the second valve ball sealing portion, and the small circulation water circuit is closed.

3. The thermal management valve with a double ball valve structure according to claim 1, characterized in that: When the thermal management valve is in the 180° open position, the small circulation water outlet hole is circumferentially closed by the second valve ball sealing part, the small circulation water path is closed, the bypass hole is closed by the first valve ball sealing part, and the bypass water path is closed.

4. The thermal management valve with a double ball valve structure according to claim 1, characterized in that: The second port and the third port are arranged vertically.

5. The thermal management valve with a double ball valve structure according to claim 1, characterized in that: The first valve ball and the second valve ball are integrally formed.

6. The thermal management valve with a double ball valve structure according to claim 1, characterized in that: One end of the rotating shaft is rotatably mounted on the top cover and is transmission-connected to the output end of the electric-controlled driver, and the other end is rotatably mounted on the return water bracket. The top cover is fixed to the top mounting hole, and the return water bracket is fixed to the bottom return water hole. The return water bracket is provided with a water-permeable hole.

7. The thermal management valve with a double ball valve structure according to claim 1, characterized in that: A closed first end cover is disposed on the top of the first valve ball, a hollow second end cover is disposed on the bottom of the second valve ball, and the rotating shaft is fixedly connected to the first end cover and the second end cover respectively.

8. The thermal management valve with a double ball valve structure according to claim 7, characterized in that: The first end cover and the first valve ball are integrally provided, and the second end cover and the second valve ball are separately provided.

9. The thermal management valve with a double ball valve structure according to claim 6, characterized in that: A third dynamic sealing device is arranged between the rotating shaft and the top cover.

10. The thermal management valve with a double ball valve structure according to claim 6, characterized in that: A sealing ring is arranged between the top cover and the valve body.

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