Multi-way valve

Abstract

The present invention provides a multi-way valve, which includes a valve housing and a valve body. The valve housing has an internal space formed in the valve housing, and includes a plurality of coolant inlet ports formed at intervals along the side surface of the valve housing and a coolant outlet port formed along the central axis of the valve housing. The valve body is inserted into the valve housing and rotates around a rotation axis of the valve body that coincides with or is parallel to the central axis of the valve housing. The valve body includes a plurality of inlet portions formed at intervals along the side surface of the valve body and an outlet portion formed along the rotation axis of the valve body, the inlet portions and the outlet portions being in communication with each other, the outlet portion facing the coolant outlet port being connected to the coolant outlet port, and the inlet portions being selectively connected to the coolant inlet port by rotation of the valve body around the rotation axis of the valve body.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority from Korean Patent Application No. 10-2021-0077510 filed on June 15, 2021, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] The present disclosure relates to a multi-way valve for use in a vehicle. Background Art

[0004] Numerous multi-way valves are used at points where multiple flow paths merge or branch in vehicle coolant lines. Conventional coolant lines have closed circuits on opposite sides of the multi-way valve. Cavitation in the coolant lines can only be eliminated by providing a reservoir for each closed circuit on opposite sides of the multi-way valve.

[0005] Cavitation occurs when the static pressure of a portion of flowing water drops below the vapor pressure corresponding to the water's temperature, causing the water to evaporate and form vapor-filled cavities within the water. Cavitation is a significant cause of noise, vibration, and blade erosion.

[0006] The information disclosed in this background technology of the present disclosure is only used to enhance the understanding of the overall background of the present disclosure and should not be regarded as an admission or any form of suggestion that the information forms the prior art known to those skilled in the art. Summary of the Invention

[0007] In the multi-way valve according to the example, additional liquid storage tanks and pipes may be provided in order to eliminate cavitation, which leads to increased manufacturing costs. Therefore, when maintenance is required, it is more time-consuming and difficult.

[0008] Therefore, it may be necessary to develop a multi-way valve capable of eliminating cavitation generated by two closed circuits using only one reservoir provided in either of the two closed circuits each connected to a corresponding one of opposite sides of the multi-way valve.

[0009] The present disclosure relates to a multi-way valve including: a valve housing having a plurality of inlet ports and outlet ports formed therein; and a valve body configured to selectively connect the plurality of inlet ports to the outlet ports by rotation of the valve body in an interior space of the valve housing.

[0010] One aspect of the present disclosure provides a multi-way valve comprising: a valve housing including a plurality of inlet ports and an outlet port; and a valve body configured to selectively connect the plurality of inlet ports to the outlet ports by rotating the valve body within the interior of the valve housing. In an embodiment, all of the plurality of inlet ports connected to a closed circuit within a vehicle interior can be connected to the outlet ports by rotating the valve body, thereby entering a fully open state. During this fully open state, cavitation in the coolant line can be eliminated by a reservoir.

[0011] 20. The throttle body as claimed in claim 19, wherein the valve body has an inner wall which is provided with a plurality of inlet portions and an outlet portion which are formed at intervals along the side surfaces of the valve body and the outlet portion is connected to the coolant outlet port so as to allow the coolant to flow in. The inlet portion and the outlet portion are connected to the coolant outlet port so as to allow the coolant to flow in. The coolant outlet port is connected to the coolant outlet port so as to allow the coolant to flow in. The coolant outlet port is connected to the coolant outlet port so as to allow the coolant to flow in. The coolant outlet port is connected to the coolant outlet port so as to allow the coolant to flow in.

[0012] The coolant inlet port of the valve housing may include a first inlet port and a second inlet port, the coolant outlet port may include a first outlet port, and a first closed circuit configured to allow the coolant flowing out through the first outlet port to flow into the valve housing through the first inlet port and a second closed circuit configured to allow the coolant flowing out through the first outlet port to flow into the valve housing through the second inlet port may be connected to each other.

[0013] Either or both of the first and second inlet ports of the valve housing may be connected to the first outlet port by rotation of the valve body.

[0014] Either one of the first and second inlet ports of the valve housing may be connected to a reservoir in the coolant line, and when both the first and second inlet ports are connected to the first outlet port, the reservoir may be utilized to eliminate cavitation in the coolant line.

[0015] The valve housing may include a first housing including a first inlet port, a second inlet port, and a first outlet port formed therein; and a second housing including a third inlet port, a fourth inlet port, and a second outlet port formed therein.

[0016] The first inlet port, the second inlet port, and the first outlet port formed in the first housing can be connected to the coolant line in the vehicle electronic drive unit, and the third inlet port, the fourth inlet port, and the second outlet port formed in the second housing can be connected to the coolant line in the vehicle battery.

[0017] The coolant inlet port of the valve housing may include a first inlet port and a second inlet port, and the coolant flows into each of the first inlet port and the second inlet port, and the inlet portion of the valve body may include a first inlet portion opening toward the first inlet port around the outlet portion of the valve body and a second inlet portion opening toward the second inlet port.

[0018] When the first inlet portion and the first inlet port are aligned with each other and the second inlet portion and the second inlet port are aligned with each other, the valve body can be fully opened, and when the valve body is rotated toward the first inlet port in the fully opened state of the valve body so that the second inlet portion is aligned with the first inlet port or is rotated toward the second inlet port in the fully opened state of the valve body so that the first inlet portion is aligned with the second inlet port, one of the first inlet port and the second inlet port can be selectively opened.

[0019] The valve body may include a plurality of rotation protrusions formed on an edge of an upper surface or a lower surface of the valve body at intervals from each other, and the plurality of rotation protrusions may be rotatably supported on an inner wall of the valve housing when the valve body rotates.

[0020] The valve housing may include a plurality of valve seals arranged on the sides of the plurality of coolant inlet ports in the internal space of the valve housing or on the inner wall of the valve housing, and the plurality of valve seals may be arranged spaced apart from each other along the inner wall of the valve housing and may be configured to align with the plurality of inlet portions when the valve body rotates, thereby preventing coolant from flowing into the internal space of the valve housing.

[0021] The cross-sectional area of ​​the outlet portion of the valve body may be formed to be larger than the cross-sectional area of ​​the coolant outlet port of the valve housing.

[0022] The central axis of the outlet portion of the valve body may be offset from the central axis of the coolant outlet port of the valve housing.

[0023] The coolant inlet port of the valve housing may include a first inlet port and a second inlet port and a third inlet port and a fourth inlet port, the coolant flows into the first inlet port and the second inlet port from one side of the valve housing, and the coolant flows into the third inlet port and the fourth inlet port from the other side of the valve housing, the coolant outlet port may include a first outlet port, and the first inlet port, the second inlet port, the third inlet port or the fourth inlet port may be selectively connected to the first outlet port by rotation of the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and other features and advantages of the present disclosure will be more clearly understood through the following detailed description taken in conjunction with the accompanying drawings, in which:

[0025] Figure 1 is a diagram illustrating a multi-way valve according to an embodiment of the present disclosure;

[0026] Figure 2 is a diagram illustrating a valve body of a multi-way valve according to an embodiment of the present disclosure;

[0027] Figure 3 and Figure 4 is a cross-sectional view showing a multi-way valve and a valve body according to an embodiment of the present disclosure; and

[0028] Figure 5 is a diagram illustrating a state in which a multi-way valve is operated by connecting the multi-way valve according to an embodiment of the present disclosure to a coolant line in a vehicle. DETAILED DESCRIPTION

[0029] Figure 1 is a diagram illustrating a multi-way valve according to an embodiment of the present disclosure. Figure 2 2 is a diagram illustrating a valve body of a multi-way valve according to an embodiment of the present disclosure. Figure 3 and Figure 4 is a cross-sectional view illustrating a multi-way valve and a valve body according to an embodiment of the present disclosure. Figure 5 is a diagram illustrating a state in which a multi-way valve is operated by connecting the multi-way valve according to an embodiment of the present disclosure to a coolant line in a vehicle.

[0030] Figure 1 is a diagram illustrating a multi-way valve according to an embodiment of the present disclosure. Figure 21 is a diagram illustrating a valve body of a multi-way valve according to an embodiment of the present disclosure. The multi-way valve according to an embodiment of the present disclosure includes: a valve housing 200 having an internal space formed therein, the valve housing 200 including a plurality of coolant inlet ports 10 formed along a side surface of the valve housing 200 and spaced apart from each other, and a coolant outlet port 20 formed through the valve housing 200 along a central axis orthogonal to the coolant inlet ports 10; and a valve body 300 inserted into the internal space of the valve housing 200 and configured to surround the valve body 300 and coincide with the central axis of the valve housing 200. The valve body 300 is rotatable about a rotation axis parallel to or spaced from one another. The valve body 300 includes a plurality of inlet portions 310 formed along a side surface of the valve body 300 and an outlet portion 320 formed along the rotation axis of the valve body 300. The inlet portions 310 and the outlet portions 320 are in communication with one another in the valve body 300. The outlet portion 320 facing the coolant outlet port 20 is always connected to the coolant outlet port 20. The inlet portions 310 are selectively connected to the coolant inlet port 10 by rotating the valve body 300 about the rotation axis of the valve body 300. When the inlet portions 310 are connected to the coolant inlet port 10, the inlet portions 310 are in fluid communication with the coolant inlet port 10, and the coolant inlet port 10 and the coolant outlet port 20 are in fluid communication with one another via the inlet portions 310 and the outlet portions 320.

[0031] In the multi-way valve according to an embodiment of the present disclosure, the coolant lines (closed circuits) in the vehicle are connected to each of the coolant inlet ports 10. Accordingly, a plurality of coolant inlet ports 10 are selectively opened, or all of the coolant inlet ports 10 are opened (fully opened). This eliminates the need for a reservoir configured to eliminate cavitation for each closed circuit in the coolant lines, and allows cavitation to be eliminated in the coolant lines using only one reservoir through a fully open function.

[0032] Figure 5 This diagram illustrates the operation of a multi-way valve according to an embodiment of the present disclosure by connecting it to a coolant line in a vehicle. In the multi-way valve according to an embodiment of the present disclosure, the coolant inlet port 10 of the valve housing 200 includes a first inlet port and a second inlet port. The coolant outlet port 20 includes a first outlet port. A first closed circuit configured to allow coolant flowing out through the first outlet port to flow into the valve housing 200 through the first inlet port and a second closed circuit configured to allow coolant flowing out through the first outlet port to flow into the valve housing 200 through the second inlet port can be connected to each other.

[0033] In addition, in the multi-way valve according to the embodiment of the present disclosure, either the first inlet port and the second inlet port of the valve housing 200 can be connected to the first outlet port by rotating the valve body 300, or both the first inlet port and the second inlet port of the valve housing 200 can be connected to the first outlet port by rotating the valve body 300.

[0034] On the other hand, in the multi-way valve according to an embodiment of the present disclosure, any one of the first inlet port and the second inlet port of the valve housing 200 can be connected to a reservoir in the coolant line, and when both the first inlet port and the second inlet port are connected to the first outlet port, the reservoir can be used to eliminate cavitation in the coolant line.

[0035] In addition, in the multi-way valve according to an embodiment of the present disclosure, the valve housing 200 may include: a first housing in which a first inlet port, a second inlet port and a first outlet port are formed; and a second housing in which a third inlet port, a fourth inlet port and a second outlet port are formed.

[0036] On the other hand, in the multi-way valve according to an embodiment of the present disclosure, the first inlet port, the second inlet port and the first outlet port formed in the first shell can be connected to the coolant line in the vehicle electronic drive unit, and the third inlet port, the fourth inlet port and the second outlet port formed in the second shell can be connected to the coolant line in the vehicle battery.

[0037] Specifically, Figure 3 A multi-way valve is shown in which two valve housings 200 are integrated with each other. In this case, each of the valve housings 200 is located on a corresponding one of the coolant line in the vehicle electronic drive unit and the coolant line in the vehicle battery. In the embodiment, referring to Figure 5 The portion connected to the coolant pump corresponds to the coolant outlet port 20 of each of the valve housings 200 , and the coolant outlet port 20 and each coolant inlet port 10 form a closed loop for coolant circulation on opposite sides with the multi-way valve as a reference.

[0038] In the embodiment, the coolant discharged from the reservoir flows into the coolant inlet port 10 on the left. In this case, in the fully open operation of the valve ( Figure 5 During situation 2) in the above example, the reservoir can be used to simultaneously eliminate cavitation in the closed circuits on opposite sides of the valve. In an embodiment, the valve can be fully opened to allow coolant in each flow path to flow into the reservoir, and cavitation in the coolant line can be eliminated by performing a venting function within the reservoir.

[0039] Figure 3 and Figure 42 is a cross-sectional view illustrating a multi-way valve and a valve body according to an embodiment of the present disclosure. In the multi-way valve according to an embodiment of the present disclosure, the coolant inlet port 10 of the valve housing 200 may include a first inlet port and a second inlet port, each of which coolant flows into, and the inlet portion 310 of the valve body 300 may include a first inlet portion 310 opening toward the first inlet port around an outlet portion 320 and a second inlet portion 310 opening toward the second inlet port.

[0040] Reference Figure 3 The first inlet portion 310 and the second inlet portion 310 are open toward the coolant inlet port 10 around the outlet portion 320, and the first inlet portion 310 and the second inlet portion 310 are formed at an angle of approximately 120 degrees. In an embodiment, when the coolant inlet port 10 is communicated with the first inlet portion 310 or the second inlet portion 310 of the valve body 300, the port is opened, thereby allowing coolant to flow through.

[0041] Specifically, in the multi-way valve according to an embodiment of the present disclosure, when the first inlet portion 310 and the first inlet port are aligned with each other and the second inlet portion 310 and the second inlet port are aligned with each other, the valve body 300 is fully opened. On the other hand, when the valve body 300 is rotated toward the first inlet port in the fully opened state of the valve body 300 so that the second inlet portion 310 is aligned with the first inlet port, or when the valve body 300 is rotated toward the second inlet port in the fully opened state of the valve body 300 so that the first inlet portion 310 is aligned with the second inlet port, one of the first inlet port and the second inlet port can be selectively opened.

[0042] In addition, in the multi-way valve according to an embodiment of the present disclosure, a plurality of rotating protrusions are formed at intervals on the edge of the upper surface of the valve body 300 or the lower surface of the valve body 300. When the valve body 300 rotates, the plurality of rotating protrusions can be rotatably supported on the inner wall of the valve housing 200. This structure is formed to minimize the contact area between the valve housing 200 and the valve body 300 when the valve body 300 rotates, thereby reducing the rotational friction of the valve body 300, limiting the rotational position of the valve body 300, and preventing the valve body 300 from stalling.

[0043] On the other hand, in the multi-way valve according to an embodiment of the present disclosure, the valve housing 200 includes a plurality of valve seals 400 provided on the side of the plurality of coolant inlet ports 10 or on the inner wall of the valve housing 200 in the internal space of the valve housing 200. In the embodiment, the plurality of valve seals 400 are provided along the inner wall of the valve housing 200 at intervals and are configured to align with the plurality of inlet portions 310 when the valve body 300 rotates, thereby preventing the coolant from flowing into the internal space of the valve housing 200.

[0044] Specifically, a valve seal 400 is provided in each of the plurality of coolant inlet ports 10 of the valve housing 200. Therefore, when the coolant inlet ports 10 are aligned with the inlet portion 310 of the valve body 300, coolant flows without leaking into the interior space of the valve housing 200. Furthermore, the valve seal 400 is also formed on the inner wall of the valve housing 200, thereby preventing coolant from flowing out of the inner wall of the valve housing 200 through any of the inlet portions 310 of the valve body 300 when only one of the coolant inlet ports 10 is open. In an embodiment, when the inlet portions 310 of the valve body 300 are arranged at an angular interval of approximately 120 degrees, two valve seals 400 are also formed in the two coolant inlet ports 10 at an angular interval of 120 degrees, and one valve seal 400 is formed on the inner wall of the valve housing 200. In this case, the valve seals 400 are arranged at equal intervals of 120 degrees, thereby maintaining an equal repulsive force on the inner wall of the valve housing 200 and improving sealing performance.

[0045] On the other hand, in the multi-way valve according to the embodiment of the present disclosure, the cross-sectional area of ​​the outlet portion 320 of the valve body 300 can be formed to be larger than the cross-sectional area of ​​the coolant outlet port 20 in the valve housing 200. In addition, in the multi-way valve according to the embodiment of the present disclosure, the central axis of the outlet portion 320 of the valve body 300 can be offset from the central axis of the coolant outlet port 20 of the valve housing 200. Thus, the design freedom of the multi-way valve according to the embodiment of the present disclosure can be further improved.

[0046] In addition, in the multi-way valve according to the embodiment of the present disclosure, the coolant inlet port 10 of the valve housing 200 includes a first inlet port and a second inlet port as well as a third inlet port and a fourth inlet port. The coolant flows into the first inlet port and the second inlet port from one side of the valve housing 200, and flows into the third inlet port and the fourth inlet port from the other side of the valve housing 200. The coolant outlet port 20 includes a first outlet port. In the embodiment, the first inlet port, the second inlet port, the third inlet port, or the fourth inlet port can be selectively connected to the first outlet port by rotating the valve body 300. In the embodiment, in addition to the Figures 1 to 5 In addition to the illustrated case where the two coolant inlet ports 10 are provided at the upper portion of the valve housing 200 , two more ports may be provided at the lower portion of the valve housing 200 as necessary, thereby realizing a coolant line having various ports and flow paths.

[0047] Therefore, the multi-way valve according to the embodiment of the present disclosure can have various effects: reducing costs by applying multiple seals having the same shape; reducing costs by manufacturing the valve stem using a single mold (no joining); eliminating force concentration by setting the seals at equal angles regardless of the port direction, thereby performing uniform surface pressure action of the seals; improving the durability of the seals; preventing blockage caused by the seals by increasing the inner diameter of the seals, thereby maintaining flow even if the ports of the housing are not set on the same axis as the seals; reducing costs by manufacturing the housing using a single mold (no joining / assembly); improving design freedom by providing a valve stem outlet with a cross-sectional area larger than the cross-sectional area of ​​the housing outlet to allow offset adjustment between the outlet centers; exhausting from the entire circuit through a fully open mode in a structure in which each closed circuit is connected to opposite sides of the valve; improving exhaust performance and ease of maintenance by performing coolant injection; and since the fully open mode allows exhaust from the entire circuit, the need to provide an additional liquid storage tank for exhausting from the existing closed circuit structure is avoided.

[0048] As apparent from the above description, the present disclosure provides a multi-way valve comprising: a valve housing including a plurality of inlet ports and an outlet port; and a valve body configured to selectively connect the plurality of inlet ports to the outlet ports by rotating the valve body within the interior space of the valve housing. In an embodiment, all of the plurality of inlet ports connected to a closed circuit within the interior of a vehicle can be connected to the outlet ports by rotating the valve body, thereby entering a fully open state. During this fully open state, cavitation in the coolant line can be eliminated by the reservoir.

[0049] Although the embodiments of the present disclosure have been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the disclosure as disclosed in the accompanying claims.

Claims

1. A multi-way valve comprising: a valve housing having an interior space formed therein, the valve housing including a plurality of coolant inlet ports formed along a side surface of the valve housing and spaced apart from one another, and a coolant outlet port formed through the valve housing along a central axis orthogonal to the coolant inlet ports; as well as The valve body is inserted into the internal space of the valve housing and rotates about a rotation axis of the valve body that coincides with or is parallel to the central axis of the valve housing. The valve body includes a plurality of inlet portions formed along a side surface of the valve body and spaced apart from each other, and an outlet portion formed along the rotation axis of the valve body. The inlet portions and the outlet portions are communicated with each other in the valve body. The outlet portion facing the coolant outlet port is always connected to the coolant outlet port. The inlet portion is selectively connected to the coolant inlet port by rotation of the valve body about the rotation axis of the valve body. Wherein, the valve housing comprises: a first housing including a first inlet port, a second inlet port, and a first outlet port formed therein; and The second housing includes a third inlet port, a fourth inlet port, and a second outlet port formed therein.

2. The multi-way valve according to claim 1, wherein: The coolant inlet port of the valve housing includes the first inlet port and the second inlet port, The coolant outlet ports include the first outlet port, and The first inlet port and the first outlet port are connected to a first closed circuit that allows coolant flowing out through the first outlet port to flow into the valve housing through the first inlet port, and the second inlet port and the first outlet port are connected to a second closed circuit that allows coolant flowing out through the first outlet port to flow into the valve housing through the second inlet port.

3. The multi-way valve according to claim 2, wherein: Either one of the first inlet port and the second inlet port of the valve housing is connected to the first outlet port by rotation of the valve body, or both of the first inlet port and the second inlet port of the valve housing are connected to the first outlet port by rotation of the valve body.

4. The multi-way valve according to claim 3, wherein: Either one of the first and second inlet ports of the valve housing is connected to a reservoir in a coolant line, and when both the first and second inlet ports are connected to the first outlet port, cavitation in the coolant line is eliminated using the reservoir.

5. The multi-way valve according to claim 1, wherein: The first inlet port, the second inlet port, and the first outlet port formed in the first housing are connected to a coolant line in a vehicle electronic drive unit, and The third inlet port, the fourth inlet port, and the second outlet port formed in the second housing are connected to a coolant line in a vehicle battery. The multi-way valve according to claim 1 , wherein: The coolant inlet port of the valve housing includes the first inlet port and the second inlet port, the coolant flows into each of the first inlet port and the second inlet port, and The inlet portion of the valve body includes a first inlet portion opened toward the first inlet port and a second inlet portion opened toward the second inlet port around the outlet portion of the valve body.

7. The multi-way valve according to claim 6, wherein: When the first inlet portion and the first inlet port are aligned with each other and the second inlet portion and the second inlet port are aligned with each other, the valve body is fully opened, and When the valve body is rotated toward the first inlet port in a fully open state of the valve body so that the second inlet portion is aligned with the first inlet port, or is rotated toward the second inlet port in a fully open state of the valve body so that the first inlet portion is aligned with the second inlet port, one of the first inlet port and the second inlet port is selectively opened.

8. The multi-way valve according to claim 1, wherein: The valve housing includes a plurality of valve seals provided on the sides of the plurality of coolant inlet ports or on the inner wall of the valve housing in an internal space of the valve housing, and The plurality of valve seals are provided along the inner wall of the valve housing at intervals from each other and are aligned with the plurality of inlet portions when the valve body rotates, thereby preventing coolant from flowing into the inner space of the valve housing.

9. The multi-way valve according to claim 1, wherein: The cross-sectional area of ​​the outlet portion of the valve body is formed to be larger than the cross-sectional area of ​​the coolant outlet port of the valve housing.

10. The multi-way valve according to claim 1, wherein: A central axis of the outlet portion of the valve body is offset from a central axis of the coolant outlet port of the valve housing.

11. The multi-way valve according to claim 1, wherein: The coolant inlet port of the valve housing includes the first and second inlet ports and the third and fourth inlet ports, into which coolant flows from one side of the valve housing, and into which coolant flows from the other side of the valve housing. The coolant outlet ports include the first outlet port, and The first inlet port, the second inlet port, the third inlet port, or the fourth inlet port is selectively connected to the first outlet port by rotation of the valve body.

12. A multi-way valve comprising: a valve housing having an interior space formed therein, the valve housing including a plurality of coolant inlet ports formed along a side surface of the valve housing and spaced apart from one another, and a coolant outlet port formed through the valve housing along a central axis orthogonal to the coolant inlet ports; as well as The valve body is inserted into the internal space of the valve housing and rotates about a rotation axis of the valve body that coincides with or is parallel to the central axis of the valve housing. The valve body includes a plurality of inlet portions formed along a side surface of the valve body and spaced apart from each other, and an outlet portion formed along the rotation axis of the valve body. The inlet portions and the outlet portions are communicated with each other in the valve body. The outlet portion facing the coolant outlet port is always connected to the coolant outlet port. The inlet portion is selectively connected to the coolant inlet port by rotation of the valve body about the rotation axis of the valve body. wherein the valve body includes a plurality of rotating protrusions formed on an edge of an upper surface of the valve body or a lower surface of the valve body and spaced apart from each other, and When the valve body rotates, the plurality of rotation protrusions are rotatably supported on the inner wall of the valve housing.

13. A multi-way valve system for a coolant of a vehicle, the system comprising: The multi-way valve according to claim 1, wherein the coolant inlet port of the valve housing includes the first inlet port and the second inlet port, and the coolant outlet port includes the first outlet port; a first closed circuit connected to the first inlet port and the first outlet port and allowing the coolant flowing out through the first outlet port to flow into the valve housing through the first inlet port; as well as A second closed circuit is connected to the second inlet port and the first outlet port, and allows the coolant flowing out through the first outlet port to flow into the valve housing through the second inlet port.

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