Valve device and thermal management system

Abstract

The utility model discloses a valve device which comprises a valve body, a valve rod, a throttling structure and a valve element, the valve rod abuts against the valve element, the valve rod is movably arranged in the valve body, and the throttling structure is fixed to the valve rod; the valve body is provided with a first channel wall and a valve port wall, the first channel wall and the valve port wall are arranged in a spaced mode in the axial direction of the valve body, at least part of the valve element is located on the side, away from the first channel wall, of the valve port wall, and the throttling structure is located on the side, away from the valve port wall, of the first channel wall or located on the side, away from the valve port wall, of the valve element. The valve element is located on the side, facing the first channel wall, of the valve port wall, and the throttling structure is located on the side, facing the valve port wall, of the first channel wall. The throttling structure limits part of the wall portion of the flowing path, and the throttling structure can play a role in throttling.

Description

TECHNICAL FIELD

[0001] The utility model relates to a thermal management technical field, concretely relates to a valve device and thermal management system. BACKGROUND

[0002] Generally, the valve core of the valve device moves under the driving of the valve rod to open the passage of the fluid. However, when the room temperature is high, the temperature sensing gas in the gas tank head will expand greatly when the valve device is initially opened, thereby driving the valve rod and the valve core to move a large stroke, and the passage area will instantaneously increase, resulting in excessive flow of the fluid. SUMMARY

[0003] The utility model discloses a valve device, can play the role of throttling.

[0004] The utility model technical scheme provides a valve device, including valve body, valve rod, throttling structure, valve core, the valve rod with the valve core abuts, the valve rod activity sets up in the valve body, the throttling structure is fixed in the valve rod, the valve body has first passageway wall, valve port wall, along the axial direction of the valve body, the first passageway wall with the valve port wall interval arrangement, at least part of the valve core is located the side of the valve port wall away from the first passageway wall, the throttling structure is located the side of the first passageway wall away from the valve port wall, or, the valve core is located the side of the valve port wall towards the first passageway wall, the throttling structure is located the side of the first passageway wall towards the valve port wall, the throttling structure defines the partial wall portion of flow path.

[0005] According to the valve device provided by the utility model embodiment, since the valve rod and the valve core abut and the throttling structure is fixed on the valve rod, when the valve rod moves, the valve core and the throttling structure will move with the valve rod. Since at least part of the valve core is located on the side of the valve port wall away from the first passageway wall, the throttling structure is located on the side of the first passageway wall away from the valve port wall, or the valve core is located on the side of the valve port wall towards the first passageway wall, and the throttling structure is located on the side of the first passageway wall towards the valve port wall, the throttling structure defines the partial wall portion of the flow path, so that with the movement of the valve rod, the opening degree change between the valve core and the valve port wall is opposite to the opening degree change between the throttling structure and the first passageway wall. Therefore, when the valve device is opened, the valve rod drives the valve core and the throttling structure to move a large distance, so that the gap between the valve core and the valve port wall is too large to cause excessive flow, but the flow area in the flow path defined by the throttling structure will decrease, thereby reducing the flow, and finally playing the role of throttling.

[0006] The utility model embodiment further provides a valve device, including valve body, valve stem, throttling structure, valve core, the valve stem with the valve core abuts, the valve stem is set up in the valve body, the throttling structure is located the valve body, and the valve stem has cooperation part, the valve body has first channel wall, valve port wall, along the axial direction of the valve body, the first channel wall with the valve port wall interval arrangement, at least part of the valve core is located the valve port wall side away from the first channel wall, the throttling structure is located the first channel wall side away from the valve port wall, alternatively, the valve core is located the valve port wall side towards the first channel wall, the throttling structure is located the first channel wall side towards the valve port wall, the throttling structure defines the partial wall part of flow path.

[0007] The valve device provided by the utility model embodiment is characterized in that the valve stem abuts against the valve core, the valve stem has a cooperation part, when the valve stem moves, the valve core and the cooperation part move along with the valve stem, at least part of the valve core is located on the side of the valve port wall away from the first channel wall, the throttling structure is located on the side of the first channel wall away from the valve port wall, alternatively, the valve core is located on the side of the valve port wall towards the first channel wall, the throttling structure is located on the side of the first channel wall towards the valve port wall, the throttling structure defines the partial wall part of the flow path, so that when the valve stem moves, the opening change between the valve core and the valve port wall is opposite to the opening change between the throttling structure and the cooperation part, when the valve device is opened, the valve stem drives the valve core and the cooperation part to move a large distance, so that the gap between the valve core and the valve port wall is too large to cause excessive flow, but the flow area in the flow path defined by the throttling structure and the cooperation part is reduced, thereby reducing the flow, and finally achieving the throttling effect.

[0008] The utility model embodiment further provides a thermal management system, including evaporimeter and valve device, the flow path defined between the throttling structure and the valve body is located the evaporimeter upstream.

[0009] The thermal management system provided by the utility model embodiment is characterized in that the flow path defined between the throttling structure and the valve body is located the evaporimeter upstream, and the throttling structure can achieve the throttling effect, so that the refrigerant needs to be throttled by the throttling structure before entering the evaporimeter, thereby enabling the refrigerant to fully exchange heat in the evaporimeter. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is the cross section structure schematic diagram of the valve device provided by the utility model first kind of embodiment;

[0011] Figure 2 is Figure 1 the enlarged structure schematic diagram of A place in;

[0012] Figure 3 is Figure 2Enlarged structural diagram at point B;

[0013] Figure 4 This is a schematic diagram of the throttling structure provided in the first embodiment of the present invention;

[0014] Figure 5 This is a schematic diagram of another throttling structure provided in the first embodiment of the present invention;

[0015] Figure 6 This is a schematic cross-sectional view of the valve stem provided in the first embodiment of this utility model;

[0016] Figure 7 yes Figure 6 Enlarged structural diagram at point C;

[0017] Figure 8 This is a cross-sectional structural schematic diagram of the valve device provided in the second embodiment of the present utility model;

[0018] Figure 9 yes Figure 8 Enlarged structural diagram at point D;

[0019] Figure 10 This is a cross-sectional structural diagram of the valve stem provided in the second embodiment of this utility model;

[0020] Figure 11 yes Figure 10 Enlarged structural diagram at point E;

[0021] Figure 12 This is a cross-sectional structural schematic diagram of the valve device provided in the third embodiment of this utility model;

[0022] Figure 13 yes Figure 12 Enlarged structural diagram at point F;

[0023] Figure 14 This is a cross-sectional structural diagram of the valve stem provided in the third embodiment of this utility model;

[0024] Figure 15 yes Figure 14 A magnified structural diagram at point G in the middle;

[0025] Figure 16 This is a cross-sectional structural schematic diagram of the valve device according to the fourth embodiment of the present invention;

[0026] Figure 17 yes Figure 16 A magnified structural diagram of point H in the middle.

[0027] Figure 18 This is a cross-sectional structural diagram of the valve stem according to the fourth embodiment of this utility model;

[0028] Figure 19 is Figure 18 Amplification structure schematic diagram at I in figure

[0029] Figure 20 is the partial cross-sectional schematic view of the valve device provided by the fifth embodiment of the utility model;

[0030] Figure 21 is the partial cross-sectional schematic view of the valve device provided by the sixth embodiment of the utility model;

[0031] Figure 22 is the partial cross-sectional schematic view of the valve device provided by the seventh embodiment of the utility model;

[0032] Figure 23 is the cross-sectional structure schematic view of the heat management system provided by the utility model;

[0033] Figure 24 is the partial structure cross-sectional schematic view of the valve body, valve core, valve rod and throttling structure provided by the first to fifth embodiments and the second sub-embodiment of the utility model;

[0034] Figure 25 is the partial structure cross-sectional schematic view of the valve body, valve core, valve rod and throttling structure provided by the fifth embodiment and the second sub-embodiment of the utility model;

[0035] Figure 26 is the partial structure cross-sectional schematic view of the valve body, valve core, valve rod and throttling structure provided by the sixth embodiment and the second sub-embodiment of the utility model;

[0036] Figure 27 is the partial structure cross-sectional schematic view of the valve body, valve core, valve rod and throttling structure provided by the seventh embodiment and the second sub-embodiment of the utility model.

[0037] 1, valve body;11, valve rod passage wall;12, first passage wall;13, first passage;14, valve rod passage;15, valve port wall;16, second passage;17, third passage;18, fourth passage;19, valve chamber;2, valve rod;21, mounting groove;22, matching part;3, throttling structure;31, mounting part;32, throttling part;4, valve core assembly;41, valve core;42, valve core frame;5, adjusting assembly;51, adjusting seat;52, adjusting spring;6, gas tank head;61, gas tank cover;62, gas tank seat;63, diaphragm;64, transmission block;65, closed chamber;66, pressure equalizing chamber;7, condenser;8, evaporator;9, compressor. DETAILED DESCRIPTION

[0038] Features and exemplary embodiments of each aspect of the present application will be described below. In order to make the purpose, technical scheme and advantages of the present application more clear and explicit, the present application will be further described below in combination with the drawings and specific embodiments. In this article, relational terms such as "first" and "second" are only used to distinguish one component from another component with the same name, and do not necessarily require or imply any such actual relationship or order between the components.

[0039] Please refer to Figures 1-2 , the valve device is a thermal expansion valve, comprising a valve body 1, a valve stem 2, a throttling structure 3, a valve core assembly 4, an adjusting assembly 5, and a gas tank head 6.

[0040] The valve body 1 is provided with a second passage 16, a valve chamber 19, a valve stem passage 14, a first passage 13, a third passage 17, and a fourth passage 18. The second passage 16 communicates with the valve chamber 19. One end of the valve stem passage 14 communicates with the valve chamber 19, and the other end communicates with the first passage 13. Therefore, the valve chamber 19 can communicate with the first passage 13 through the valve stem passage 14. The first passage 13 can communicate with the third passage 17, and the third passage 17 can communicate with the fourth passage 18.

[0041] It is conceivable that the first passage wall 12 and the valve port wall 15 are arranged in a spaced manner along the axial direction of the valve body 1. The valve stem passage wall 11 can surround at least part of the valve stem passage 14. The opening through which the valve stem passage 14 communicates with the valve chamber 19 is a valve port. The valve port wall 15 can surround at least part of the valve port. The diameter of the side of the valve port wall 15 close to the first passage wall 12 is smaller than the diameter of the side of the valve port wall 15 away from the first passage wall 12. The first passage wall 12 can surround at least part of the first passage 13.

[0042] The valve core assembly 4 is arranged in the valve chamber 19. The valve core assembly 4 comprises a valve core 41 and a valve core holder 42. The valve core 41 is arranged in cooperation with the valve port wall 15. The valve core holder 42 abuts against the valve core 41.

[0043] At least part of the adjusting assembly 5 is arranged in the valve chamber 19. The adjusting assembly 5 comprises an adjusting seat 51 and an adjusting spring 52. The adjusting seat 51 is threadedly connected with the inner wall forming the valve chamber 19. One end of the adjusting spring 52 abuts against the adjusting seat 51, and the other end abuts against the valve core holder 42.

[0044] The gas tank head 6 is fixed to one side of the valve body 1 provided with the third passage 17 and the fourth passage 18, and specifically, the gas tank head 6 comprises a gas tank cover 61, a gas tank base 62, a diaphragm 63 and a transmission block 64, and the gas tank base 62 is fixed to the valve body 1 by screwing. The gas tank cover 61 and the gas tank base 62 are fixed, and the fixing mode can be welding. The diaphragm 63 is located between the gas tank cover 61 and the gas tank base 62, and the diaphragm 63 divides the space between the gas tank cover 61 and the gas tank base 62 into a closed chamber 65 and an equalizing chamber 66, wherein the closed chamber 65 is located between the diaphragm 63 and the gas tank cover 61, and the equalizing chamber 66 is located between the diaphragm 63 and the gas tank base 62. The closed chamber 25 is filled with temperature-sensitive gas. The equalizing chamber 66 is in communication with the third passage 17 and the fourth passage 18. The transmission block 64 is in abutment with the diaphragm 63. The valve rod 2 is movably arranged in the valve body 1, and one end of the valve rod 2 is in abutment with the transmission block 64, and the other end is in abutment with the valve core 41. It can be conceived that the temperature-sensitive gas can sense the temperature of the refrigerant entering the equalizing chamber 66, thereby realizing different degrees of expansion, and then driving the diaphragm 63 to deform, and the deformed diaphragm 63 can drive the valve core 41 to move axially through the transmission block 64 and the valve rod 2, so as to realize the opening and closing of the refrigerant passage.

[0045] It needs to be clear that when the room temperature is high, the initial opening of the thermal expansion valve, the temperature-sensitive gas will expand greatly in a short time, thereby driving the diaphragm 63 to deform greatly, and the diaphragm 63 drives the valve core 41 to move axially through the transmission block 64 and the valve rod 2 by a large distance, so that the distance between the valve core 41 and the valve port wall 15 is large, thereby causing a large refrigerant flow. On this basis, the utility model fixes the throttling structure 3 on the valve rod 2, which plays a throttling role when the thermal expansion valve is initially opened and the flow is too large. In addition, the throttling structure 3 can be an integral structure with the valve rod 2, or the throttling structure 3 and the valve rod 2 can also be two structures fixedly assembled together.

[0046] Specifically, please refer to Figure 2 , at least part of the valve core 41 is located on the side of the valve port wall 15 away from the first passage wall 12, and the throttling structure 3 is located on the side of the first passage wall 12 away from the valve port wall 15, or please refer to Figure 24 , the valve core 41 is located on the side of the valve port wall 15 facing the first passage wall 12, and the throttling structure 3 is located on the side of the first passage wall 12 facing the valve port wall 15. The throttling structure 3 defines a part of the wall of the flow path, which refers to the path through which the refrigerant flows in the valve body 1. With the movement of the valve rod 2, the opening degree change between the valve core 41 and the valve port wall 15 is opposite to the opening degree change between the throttling structure 3 and the first passage wall 12, so when the valve device is opened, the valve rod 2 drives the valve core 41 and the throttling structure 3 to move a large distance, so that the gap between the valve core 41 and the valve port wall 15 is too large to cause a large flow, but the flow area in the flow path defined by the throttling structure 3 will be reduced, thereby reducing the flow, and finally playing a throttling role.

[0047] Please refer to Figure 3 , a first flow area S1 is formed between the spool 41 and the valve port wall 15, and a second flow area S2 is formed between the throttling structure 3 and the valve body 1. When the valve stem 2 moves towards the gas tank head 6, the first flow area S1 decreases, and the second flow area S2 increases; when the valve stem 2 moves away from the gas tank head 6, the first flow area S1 increases, and the second flow area S2 decreases. Therefore, with the movement of the valve stem 2, the area change of the first flow area S1 and the second flow area S2 shows opposite trends, so when the first flow area S1 is too large and causes excessive flow, the second flow area S2 decreases to reduce the flow, ultimately playing a throttling role.

[0048] The valve body 1 further comprises a valve stem passage wall 11, which can surround at least part of the valve stem passage 14, and a third flow area S3 is formed between the valve stem 2 and the valve stem passage wall 11. It is conceivable that the valve stem passage 14 is in the shape of a regular cylinder, and the valve stem 2 is also in the shape of a regular cylinder, so the size of the third flow area S3 between the two is constant.

[0049] It should be clear that the first flow area S1 refers to the smallest area available for refrigerant flow between the spool 41 and the valve port wall 15 at a certain moment. Similarly, the second flow area S2 refers to the smallest area available for refrigerant flow between the throttling structure 3 and the valve body 1 at a certain moment, and the third flow area S3 refers to the smallest area available for refrigerant flow between the valve stem 2 and the valve stem passage wall 11 at a certain moment.

[0050] During the operation of the thermal expansion valve, the valve stem 2 has at least one of the following positions:

[0051] First position, first flow area S1 = 0;

[0052] Second position, first flow area S1 < third flow area S3;

[0053] Third position, first flow area S1 ≥ third flow area S3 > second flow area S2.

[0054] Specifically, when the thermal expansion valve is not opened, the valve stem 2 is in the first position, at this time the valve core 41 is in abutment with the valve port wall 15, thus the first flow area S1 = 0. Then, the thermal expansion valve is just opened, the valve stem 2 is in the second position, at this time the valve stem 2 drives the valve core 41 to move a certain distance, so that the valve core 41 is spaced from the valve port wall 15, thus the first flow area S1 > 0, but the first flow area S1 < the third flow area S3, it needs to be clear that since the first flow area S1 < the third flow area S3, the first flow area S1 controls the size of the refrigerant flow, in the normal working state of the thermal expansion valve, that is, at this time the throttling structure 3 does not need to play the throttling effect. Then, the valve stem 2 is in the third position, at this time the valve stem 2 drives the valve core 41 to move a large distance, so that the valve core 41 is far away from the valve port wall 15, thus the first flow area S1 ≥ the third flow area S3, it needs to be clear that at this time the third flow area S3 controls the size of the refrigerant flow, which has deviated from the normal working state of the thermal expansion valve, the refrigerant flow has been too large, thus the throttling structure 3 needs to be throttled, that is, the third flow area S3 > the second flow area S2. The second flow area S2 with smaller area can reduce the flow of the refrigerant, thereby playing a throttling effect when the valve stem 2 is in the third position.

[0055] Embodiment one

[0056] Embodiment one includes two sub-embodiments, the first sub-embodiment:

[0057] When at least part of the valve core 41 is located on the side of the valve port wall 15 away from the first channel wall 12, and the throttling structure 3 is located on the side of the first channel wall 12 away from the valve port wall 15, please refer to Figures 1-7 The throttling structure 3 includes a mounting portion 31 and a throttling portion 32, the mounting portion 31 can be annular, and correspondingly, an annular mounting groove 21 is also provided on the valve stem 2, the mounting portion 31 can be clamped in the mounting groove 21, so that the throttling structure 3 is fixed on the valve stem 2.

[0058] The throttling portion 32 is fixed with the mounting portion 31, and can also be integrally formed. The throttling portion 32 is at least one, and extends in a circle with the valve stem 2 as the center. The shape and central angle of the throttling portion 32 are not limited, as long as the throttling portion 32 can reduce the flow of the refrigerant. In the first sub-embodiment, the size of the throttling portion 32 close to the mounting portion 31 side is smaller than the diameter of the throttling portion 32 away from the mounting portion 31 side, and this shape can have a better throttling effect.

[0059] It can be conceived that according to the actual need of the throttling effect, different number, different central angle, different shape of the throttling portion 32 can be designed, so that the throttling structure 3 in the first sub-embodiment has better universality.

[0060] In addition, the throttling structure 3 in the first sub-embodiment can be installed by thermal expansion and contraction. Specifically, the throttling structure 3 can be first heated to expand the diameter of the inner hole of the mounting portion 31, and then the throttling structure 3 is placed in the first channel 13. At this time, the valve rod 2 is installed so that the valve rod 2 passes through the inner hole of the mounting portion 31, and the mounting groove 21 is at the same axial height as the mounting portion 31. Then wait for the throttling structure 3 to cool down, and the diameter of the inner hole of the mounting portion 31 is reduced, so that the mounting portion 31 is clamped in the mounting groove 21. Of course, if the diameter of the through hole of the valve body 1 for installing the valve rod 2 is greater than the outer diameter of the throttling structure 3, the throttling structure 3 can be first installed on the valve rod 2, and then the valve rod 2 is installed in the valve body 1.

[0061] Referring to Figure 4 , along the circumference of the valve rod 2, the central angle of the throttling portion 32 can be less than 360°, at this time, the throttling portion 32 has a space, and the space can be used for refrigerant flow.

[0062] On the basis that the central angle of the throttling portion 32 is less than 360°, there are two cases:

[0063] The first case is that the outer diameter of the throttling portion 32 is greater than the diameter of the valve rod channel 14, that is, the throttling portion 32 is located in the first channel 13, at this time, the space between the throttling portion 32 and the first channel wall 12 and the space between the throttling portion 32 form the second flow area S2 together.

[0064] The second case is that the outer diameter of the throttling portion 32 is less than the diameter of the valve rod channel 14, that is, at least part of the throttling portion 32 can be located in the valve rod channel 14, at this time, the space between the throttling portion 32 and the valve rod channel wall 11 and the space between the throttling portion 32 form the second flow area S2 together.

[0065] Therefore, when the central angle of the throttling portion 32 is less than 360°, the outer diameter of the throttling portion 32 can be changed according to actual needs, so that the throttling portion 32 is located in the first channel 13 or the valve rod channel 14, thereby realizing different throttling effects.

[0066] Referring to Figure 5 , along the circumference of the valve rod 2, the central angle of the throttling portion 32 can be equal to 360°.

[0067] On the basis that the central angle of the throttling portion 32 is equal to 360°, there are also two cases:

[0068] The first case is that the outer diameter of the throttling portion 32 is greater than the diameter of the valve rod channel 14, that is, the throttling portion 32 is located in the first channel 13, and the throttling portion 32 needs to be spaced apart from the first channel wall 12, at this time, the throttling portion 32 and the first channel wall 12 form the second flow area S2;

[0069] In the second case, the outer diameter of the throttling portion 32 is smaller than the diameter of the valve rod passage 14, i.e. at least part of the throttling portion 32 can be located in the valve rod passage 14, and the throttling portion 32 needs to be spaced from the valve rod passage wall 11, and a second flow area S2 is formed between the throttling portion 32 and the valve rod passage wall 11.

[0070] Therefore, when the central angle of the throttling portion 32 is equal to 360°, the outer diameter of the throttling portion 32 can be changed according to actual requirements, so that the throttling portion 32 is located in the first passage 13 or the valve rod passage 14, thereby achieving different throttling effects.

[0071] The second sub-embodiment is as follows:

[0072] When the valve core 41 is located on the side of the valve port wall 15 facing the first passage wall 12, and the throttling structure 3 is located on the side of the first passage wall 12 facing the valve port wall 15, i.e. in the axial direction of the valve body 1, at least part of the valve port wall 15 is located on the side of the valve core 41 away from the throttling structure 3, and at least part of the first passage wall 12 is located on the side of the throttling structure 3 away from the valve core 41. Please refer to Figure 24 、 Figures 4-7 In the second sub-embodiment, the first passage wall 12, the valve port wall 15, and the valve rod passage wall 11 of the valve body 1 can surround a containing space, and the valve core 41 and the throttling structure 3 are both located in the containing space. At this time, in order to cooperate with the valve core 41, the diameter of the side of the valve port wall 15 close to the first passage wall 12 is greater than the diameter of the side of the valve port wall 15 away from the first passage wall 12. In order to cooperate with the throttling structure 3, the diameter of the side of the first passage wall 12 close to the valve port wall 15 is greater than the diameter of the side of the first passage wall 12 away from the valve port wall 15.

[0073] In addition, the installation mode of the second sub-embodiment can be that the valve body 1 includes two parts, and each part has part of the first passage wall 12, the valve port wall 15, and the valve rod passage wall 11. At this time, the valve core 41 and the throttling structure 3 are first placed in one part of the valve body 1, and then the other part of the valve body 1 is fixed with the one part of the valve body 1, so that the valve core 41 and the throttling structure 3 are located in the containing space surrounded by the first passage wall 12, the valve port wall 15, and the valve rod passage wall 11. The fixing mode of the throttling structure 3 and the valve rod 2 can refer to the first sub-embodiment.

[0074] The remaining features of the second sub-embodiment are the same as those of the first sub-embodiment, and will not be described here.

[0075] Embodiment two

[0076] Embodiment two includes two sub-embodiments, the first sub-embodiment is as follows:

[0077] When at least part of the valve core 41 is located on the side of the valve port wall 15 away from the first passage wall 12, and the throttling structure 3 is located on the side of the first passage wall 12 away from the valve port wall 15, please refer to Figures 8-11The throttling structure 3 can be fixed on the valve stem 2, preferably integrally formed.

[0078] The diameter of the throttling structure 3 on the side closer to the valve core 41 is smaller than the diameter on the side farther from the valve core 41, thereby achieving a better throttling effect. In the first sub-embodiment, the throttling part 32 includes a conical surface, and the area between the conical surface and the valve body 1 can change linearly when the valve stem 2 is in different positions.

[0079] Along the circumference of valve stem 2, the central angle of throttling section 32 can be less than 360°. At this time, there is space between throttling sections 32, and this space can be used for refrigerant flow.

[0080] Based on the fact that the central angle of the throttling section 32 is less than 360°, there are two cases:

[0081] In the first case, the outer diameter of the throttling part 32 is larger than the diameter of the valve stem channel 14, that is, the throttling part 32 is located inside the first channel 13. At this time, the space between the throttling part 32 and the first channel wall 12, and the space between the throttling parts 32, together form the second flow area S2.

[0082] In the second case, the outer diameter of the throttling part 32 is smaller than the diameter of the valve stem passage 14, that is, at least part of the throttling part 32 can be located inside the valve stem passage 14. In this case, the space between the throttling part 32 and the valve stem passage wall 11, and the space between the throttling parts 32, together form the second flow area S2.

[0083] Along the circumference of valve stem 2, the central angle of throttling section 32 can be equal to 360°.

[0084] Based on the fact that the central angle of the throttling section 32 is equal to 360°, there are also two cases:

[0085] In the first case, the outer diameter of the throttling part 32 is larger than the diameter of the valve stem channel 14, that is, the throttling part 32 is located in the first channel 13, and the throttling part 32 needs to be spaced apart from the first channel wall 12. In this case, a second flow area S2 is formed between the throttling part 32 and the first channel wall 12.

[0086] In the second case, the outer diameter of the throttling part 32 is smaller than the diameter of the valve stem passage 14, that is, at least part of the throttling part 32 can be located inside the valve stem passage 14, and the throttling part 32 needs to be spaced apart from the valve stem passage wall 11. In this case, a second flow area S2 is formed between the throttling part 32 and the valve stem passage wall 11.

[0087] Second sub-example:

[0088] When the spool 41 is located at the side of the valve port wall 15 facing the first passage wall 12, and the throttling structure 3 is located at the side of the first passage wall 12 facing the valve port wall 15, i.e. along the axial direction of the valve body 1, at least part of the valve port wall 15 is located at the side of the spool 41 away from the throttling structure 3, and at least part of the first passage wall 12 is located at the side of the throttling structure 3 away from the spool 41. Please refer to Figure 24 , Figures 10-11 In the second sub-embodiment, the first passage wall 12, the valve port wall 15, and the valve rod passage wall 11 of the valve body 1 can surround a containing space, and the spool 41 and the throttling structure 3 are both located in the containing space. At this time, in order to cooperate with the spool 41, the diameter of the side of the valve port wall 15 close to the first passage wall 12 is greater than the diameter of the side of the valve port wall 15 away from the first passage wall 12. In order to cooperate with the throttling structure 3, the diameter of the side of the first passage wall 12 close to the valve port wall 15 is greater than the diameter of the side of the first passage wall 12 away from the valve port wall 15.

[0089] In addition, the installation mode of the second sub-embodiment can be that the valve body 1 includes two parts, and each part has part of the first passage wall 12 and the valve port wall 15. At this time, the spool 41 is first placed in one part of the valve body 1, and then the other part of the valve body 1 is fixed with the part of the valve body 1, so that the spool 41 is located in the containing space surrounded by the first passage wall 12, the valve port wall 15, and the valve rod passage wall 11.

[0090] The remaining features of the second sub-embodiment are the same as those of the first sub-embodiment, and will not be described here.

[0091] Embodiment Three

[0092] Embodiment Three includes two sub-embodiments, the first sub-embodiment being:

[0093] When at least part of the spool 41 is located at the side of the valve port wall 15 away from the first passage wall 12, and the throttling structure 3 is located at the side of the first passage wall 12 away from the valve port wall 15, please refer to Figures 12-15 The throttling structure 3 can be fixed on the valve rod 2, preferably integrally formed.

[0094] The diameter of the side of the throttling structure 3 close to the spool 41 is smaller than the diameter of the side of the throttling structure 3 away from the spool 41, so as to achieve better throttling effect. In the first sub-embodiment, the throttling part 32 includes a concave surface.

[0095] Along the circumferential direction of the valve rod 2, the central angle of the throttling part 32 can be less than 360°, at this time, the throttling part 32 has a space, and the space can be used for the flow of refrigerant.

[0096] On the basis that the central angle of the throttling part 32 is less than 360°, there are two cases:

[0097] In the first case, the outer diameter of the throttling portion 32 is greater than the diameter of the valve stem passage 14, i.e. the throttling portion 32 is located in the first passage 13, and the space between the throttling portion 32 and the first passage wall 12, and between the throttling portions 32, jointly form the second flow area S2.

[0098] In the second case, the outer diameter of the throttling portion 32 is less than the diameter of the valve stem passage 14, i.e. at least part of the throttling portion 32 can be located in the valve stem passage 14, and the space between the throttling portion 32 and the valve stem passage wall 11, and between the throttling portions 32, jointly form the second flow area S2.

[0099] Along the circumference of the valve stem 2, the central angle of the throttling portion 32 can be equal to 360°.

[0100] On the basis of the central angle of the throttling portion 32 being equal to 360°, there are also two cases:

[0101] In the first case, the outer diameter of the throttling portion 32 is greater than the diameter of the valve stem passage 14, i.e. the throttling portion 32 is located in the first passage 13, and the throttling portion 32 needs to be spaced apart from the first passage wall 12, and the space between the throttling portion 32 and the first passage wall 12 forms the second flow area S2.

[0102] In the second case, the outer diameter of the throttling portion 32 is less than the diameter of the valve stem passage 14, i.e. at least part of the throttling portion 32 can be located in the valve stem passage 14, and the throttling portion 32 needs to be spaced apart from the valve stem passage wall 11, and the space between the throttling portion 32 and the valve stem passage wall 11 forms the second flow area S2.

[0103] Second sub-embodiment:

[0104] When the valve core 41 is located on the side of the valve port wall 15 facing the first passage wall 12, and the throttling structure 3 is located on the side of the first passage wall 12 facing the valve port wall 15, i.e. along the axial direction of the valve body 1, at least part of the valve port wall 15 is located on the side of the valve core 41 away from the throttling structure 3, and at least part of the first passage wall 12 is located on the side of the throttling structure 3 away from the valve core 41. Please refer to Figure 24 , Figures 14-15 In the second sub-embodiment, the first passage wall 12, the valve port wall 15, and the valve stem passage wall 11 of the valve body 1 can surround a containing space, and the valve core 41 and the throttling structure 3 are both located in the containing space. At this time, in order to cooperate with the valve core 41, the diameter of the side of the valve port wall 15 close to the first passage wall 12 is greater than the diameter of the side of the valve port wall 15 away from the first passage wall 12. In order to cooperate with the throttling structure 3, the diameter of the side of the first passage wall 12 close to the valve port wall 15 is greater than the diameter of the side of the first passage wall 12 away from the valve port wall 15.

[0105] In addition, the second sub-embodiment can be installed in the following way: the valve body 1 is composed of two parts, and each part has a part of the first passage wall 12 and the valve port wall 15. The valve core 41 is first placed in one part of the valve body 1, and then the other part of the valve body 1 is fixed with the part of the valve body 1, so that the valve core 41 is located in the accommodating space surrounded by the first passage wall 12, the valve port wall 15, and the valve rod passage wall 11.

[0106] The remaining features of the second sub-embodiment are the same as those of the first sub-embodiment, and will not be described here.

[0107] Embodiment Four

[0108] Embodiment Four includes two sub-embodiments, the first sub-embodiment being:

[0109] When at least part of the valve core 41 is located on the side of the valve port wall 15 away from the first passage wall 12, and the throttling structure 3 is located on the side of the first passage wall 12 away from the valve port wall 15, please refer to Figures 16-19 The throttling structure 3 can be fixed on the valve rod 2, preferably integrally formed.

[0110] The diameter of the throttling structure 3 near the valve core 41 is smaller than the diameter of the throttling structure 3 away from the valve core 41, so as to achieve better throttling effect. In the first sub-embodiment, the throttling part 32 includes a convex surface.

[0111] Along the circumference of the valve rod 2, the central angle of the throttling part 32 can be less than 360°, at this time, the throttling part 32 has a space, and the space can be used for the flow of refrigerant.

[0112] On the basis that the central angle of the throttling part 32 is less than 360°, there are two cases:

[0113] The first case is that the outer diameter of the throttling part 32 is greater than the diameter of the valve rod passage 14, that is, the throttling part 32 is located in the first passage 13, at this time, the space between the throttling part 32 and the first passage wall 12 and the space between the throttling parts 32 together form the second flow area S2;

[0114] The second case is that the outer diameter of the throttling part 32 is smaller than the diameter of the valve rod passage 14, that is, at least part of the throttling part 32 can be located in the valve rod passage 14, at this time, the space between the throttling part 32 and the valve rod passage wall 11 and the space between the throttling parts 32 together form the second flow area S2.

[0115] Along the circumference of the valve rod 2, the central angle of the throttling part 32 can be equal to 360°.

[0116] On the basis that the central angle of the throttling part 32 is equal to 360°, there are also two cases:

[0117] In the first case, the outer diameter of the throttling part 32 is larger than the diameter of the valve stem channel 14, that is, the throttling part 32 is located in the first channel 13, and the throttling part 32 needs to be spaced apart from the first channel wall 12. In this case, a second flow area S2 is formed between the throttling part 32 and the first channel wall 12.

[0118] In the second case, the outer diameter of the throttling part 32 is smaller than the diameter of the valve stem passage 14, that is, at least part of the throttling part 32 can be located inside the valve stem passage 14, and the throttling part 32 needs to be spaced apart from the valve stem passage wall 11. In this case, a second flow area S2 is formed between the throttling part 32 and the valve stem passage wall 11.

[0119] Second sub-example:

[0120] When the valve core 41 is located on the side of the valve port wall 15 facing the first channel wall 12, and the throttling structure 3 is located on the side of the first channel wall 12 facing the valve port wall 15, that is, along the axial direction of the valve body 1, at least a portion of the valve port wall 15 is located on the side of the valve core 41 away from the throttling structure 3, and at least a portion of the first channel wall 12 is located on the side of the throttling structure 3 away from the valve core 41. Please refer to [link / reference]. Figure 24 , Figures 14-15 In the second sub-embodiment, the first channel wall 12, the valve port wall 15, and the valve stem channel wall 11 of the valve body 1 can enclose a receiving space, and the valve core 41 and the throttling structure 3 are both located within this receiving space. In this case, to cooperate with the valve core 41, the diameter of the valve port wall 15 on the side closer to the first channel wall 12 is larger than the diameter of the valve port wall 15 on the side farther from the first channel wall 12. Similarly, to cooperate with the throttling structure 3, the diameter of the first channel wall 12 on the side closer to the valve port wall 15 is larger than the diameter of the first channel wall 12 on the side farther from the valve port wall 15.

[0121] Alternatively, the installation method of the second sub-implementation is as follows: the valve body 1 includes two parts, and each part has a portion of the first channel wall 12 and the valve port wall 15. In this case, the valve core 41 is first placed in one part of the valve body 1, and then the other part of the valve body 1 is fixed to the first part of the valve body 1, so that the valve core 41 is located in the accommodating space enclosed by the first channel wall 12, the valve port wall 15, and the valve stem channel wall 11.

[0122] The remaining features of the second sub-implementation are the same as those of the first sub-implementation, and will not be repeated here.

[0123] It should be noted that at least two of Embodiments 2, 3, and 4 can be combined with each other, that is, the shape of the throttling section 32 includes at least one of a conical surface, a concave surface, and a convex surface.

[0124] Example 5

[0125] Example 5 includes two sub-examples, the first seed example:

[0126] When at least part of the valve core 41 is located on the side of the valve port wall 15 away from the first channel wall 12, and the throttling structure 3 is located on the side of the first channel wall 12 away from the valve port wall 15, please refer to Figure 20 , the throttling structure 3 can be located on the valve body 1, and the valve rod 2 has a matching part 22. Specifically, the throttling structure 3 can include a throttling part 32, which can be a tapered surface. The diameter of the tapered surface near the side of the valve core 41 is smaller than the diameter of the tapered surface away from the side of the valve core 41. The tapered surface can be located at the junction of the first channel wall 12 and the valve rod channel wall 11. The matching part 22 is protrudingly arranged on the outer surface of the valve rod 2, and the matching part 22 and the throttling part 32 jointly function as throttling.

[0127] The specific shape of the matching part 22 is not limited, as long as it can jointly throttle with the throttling part 32. Preferably, the shape can be a tapered surface, a concave surface, a convex surface, etc. Along the circumference of the valve rod 2, the central angle of the matching part 22 can be less than 360° or equal to 360°. The outer diameter of the matching part 22 can be greater than the diameter of the valve rod channel wall 11, at which time the matching part 22 is located in the first channel 13, or the outer diameter of the matching part 22 can be smaller than the diameter of the valve rod channel wall 11, at which time at least part of the matching part 22 can be located in the valve rod channel 14.

[0128] Second sub-embodiment:

[0129] When the valve core 41 is located on the side of the valve port wall 15 facing the first channel wall 12, and the throttling structure 3 is located on the side of the first channel wall 12 facing the valve port wall 15, please refer to Figure 25 , in the second sub-embodiment, the valve port wall 15, the valve rod channel wall 11, and the throttling part 32 of the valve body 1 can surround an accommodation space, and the valve core 41 and the matching part 22 are both located in the accommodation space. At this time, in order to cooperate with the valve core 41, the diameter of the valve port wall 15 near the first channel wall 12 is greater than the diameter of the valve port wall 15 away from the first channel wall 12. In order to cooperate with the matching part 22, the throttling part 32 is located between the valve rod channel wall 11 and the first channel wall 12, and the diameter of the throttling part 32 near the valve port wall 15 is greater than the diameter of the throttling part 32 away from the valve port wall 15.

[0130] In addition, the installation method of the second sub-embodiment can be that the valve body 1 includes two parts, and each part has part of the throttling part 32, the valve port wall 15, and the valve rod channel wall 11. At this time, the valve core 41 is first placed in one of the valve bodies 1, and then the other valve body 1 is fixed with the valve body 1, so that the valve core 41 is located in the accommodation space surrounded by the throttling part 32, the valve port wall 15, and the valve rod channel wall 11.

[0131] The remaining features of the second sub-embodiment are the same as those of the first sub-embodiment, and will not be repeated here.

[0132] Embodiment six

[0133] Embodiment six includes two sub-embodiments, the first sub-embodiment:

[0134] When at least part of the valve core 41 is located on the side of the valve port wall 15 away from the first passage wall 12, and the throttling structure 3 is located on the side of the first passage wall 12 away from the valve port wall 15, please refer to Figure 21 , the throttling structure 3 can be located in the valve body 1, and the valve rod 2 has a matching part 22. Specifically, the throttling structure 3 can include a throttling part 32, which can be a convex surface. The diameter of the convex surface near the side of the valve core 41 is smaller than the diameter of the convex surface away from the side of the valve core 41. The convex surface can be located at the junction of the first passage wall 12 and the valve rod passage wall 11. The matching part 22 protrudes from the outer surface of the valve rod 2, and the matching part 22 and the throttling part 32 jointly function as a throttle.

[0135] The specific shape of the matching part 22 is not limited, as long as it can jointly throttle with the throttling part 32. The preferred shape can be a tapered surface, a concave surface, a convex surface, etc. Along the circumference of the valve rod 2, the central angle of the matching part 22 can be less than 360° or equal to 360°. The outer diameter of the matching part 22 can be greater than the diameter of the valve rod passage wall 11, at which time the matching part 22 is located in the first passage 13, or the outer diameter of the matching part 22 can be smaller than the diameter of the valve rod passage wall 11, at which time at least part of the matching part 22 can be located in the valve rod passage 14.

[0136] The second sub-embodiment:

[0137] When the valve core 41 is located on the side of the valve port wall 15 facing the first passage wall 12, and the throttling structure 3 is located on the side of the first passage wall 12 facing the valve port wall 15, please refer to Figure 26 , in the second sub-embodiment, the valve port wall 15, the valve rod passage wall 11, and the throttling part 32 of the valve body 1 can surround an accommodation space, and the valve core 41 and the matching part 22 are both located in the accommodation space. At this time, in order to cooperate with the valve core 41, the diameter of the valve port wall 15 near the first passage wall 12 is greater than the diameter of the valve port wall 15 away from the first passage wall 12. In order to cooperate with the matching part 22, the throttling part 32 is located between the valve rod passage wall 11 and the first passage wall 12, and the diameter of the throttling part 32 near the valve port wall 15 is greater than the diameter of the throttling part 32 away from the valve port wall 15.

[0138] In addition, the installation method of the second sub-embodiment can be that the valve body 1 includes two parts, and each part has part of the throttling part 32, the valve port wall 15, and the valve rod passage wall 11. At this time, the valve core 41 is first placed in one of the two valve bodies 1, and then the other valve body 1 is fixed with the valve body 1, so that the valve core 41 is located in the accommodation space surrounded by the throttling part 32, the valve port wall 15, and the valve rod passage wall 11.

[0139] The remaining features of the second sub-embodiment are the same as those of the first sub-embodiment, and will not be repeated here.

[0140] Embodiment Seven

[0141] Embodiment Seven includes two sub-embodiments, the first sub-embodiment:

[0142] When at least part of the valve core 41 is located on the side of the valve port wall 15 away from the first passage wall 12, and the throttling structure 3 is located on the side of the first passage wall 12 away from the valve port wall 15, please refer to Figure 22 , the throttling structure 3 can be located in the valve body 1, and the valve stem 2 has a matching part 22. Specifically, the throttling structure 3 can include a throttling part 32, which can be a concave surface. The diameter of the concave surface near the side of the valve core 41 is smaller than the diameter of the concave surface away from the side of the valve core 41. The concave surface can be located at the junction of the first passage wall 12 and the valve stem passage wall 11. The matching part 22 is protrudingly arranged on the outer surface of the valve stem 2, and the matching part 22 and the throttling part 32 jointly function as throttling.

[0143] The specific shape of the matching part 22 is not limited, as long as it can jointly throttle with the throttling part 32. The preferred shape can be a tapered surface, a concave surface, a convex surface, etc. Along the circumference of the valve stem 2, the central angle of the matching part 22 can be less than 360° or equal to 360°. The outer diameter of the matching part 22 can be greater than the diameter of the valve stem passage wall 11, at which time the matching part 22 is located in the first passage 13, or the outer diameter of the matching part 22 can be smaller than the diameter of the valve stem passage wall 11, at which time at least part of the matching part 22 can be located in the valve stem passage 14.

[0144] The second sub-embodiment:

[0145] When the valve core 41 is located on the side of the valve port wall 15 facing the first passage wall 12, and the throttling structure 3 is located on the side of the first passage wall 12 facing the valve port wall 15, please refer to Figure 27 , in the second sub-embodiment, the valve port wall 15, the valve stem passage wall 11, and the throttling part 32 of the valve body 1 can surround an accommodation space, and the valve core 41 and the matching part 22 are both located in the accommodation space. At this time, in order to cooperate with the valve core 41, the diameter of the valve port wall 15 near the first passage wall 12 is greater than the diameter of the valve port wall 15 away from the first passage wall 12. In order to cooperate with the matching part 22, the throttling part 32 is located between the valve stem passage wall 11 and the first passage wall 12, and the diameter of the throttling part 32 near the valve port wall 15 is greater than the diameter of the throttling part 32 away from the valve port wall 15.

[0146] In addition, the installation method of the second sub-embodiment can be that the valve body 1 includes two parts, and each part has part of the throttling part 32, the valve port wall 15, and the valve stem passage wall 11. At this time, the valve core 41 is first placed in one of the two valve bodies 1, and then the other valve body 1 is fixed with the valve body 1, so that the valve core 41 is located in the accommodation space surrounded by the throttling part 32, the valve port wall 15, and the valve stem passage wall 11.

[0147] The remaining features of the second sub-embodiment are the same as those of the first sub-embodiment, and will not be described again here.

[0148] It is conceivable that, in Embodiment Five, Embodiment Six, and Embodiment Seven, the opening change between the valve core 41 and the valve port wall 15 is opposite to the opening change between the throttling structure 3 and the matching portion 22 as the valve stem 2 moves, so when the valve device is opened, the valve stem 2 drives the valve core 41 and the matching portion 22 to move a large distance, so that the gap between the valve core 41 and the valve port wall 15 is too large to cause excessive flow, but the flow area in the flow path defined by the throttling structure 3 and the matching portion 22 can be reduced, thereby reducing the flow, and ultimately playing a throttling role.

[0149] In addition, in Embodiment Five, Embodiment Six, and Embodiment Seven, the first flow area S1 is formed between the valve core 41 and the valve port wall 15, and the second flow area S2 is formed between the throttling structure 3 and the matching portion 22. When the valve stem 2 moves towards the gas tank head 6, the first flow area S1 decreases and the second flow area S2 increases; when the valve stem 2 moves away from the gas tank head 6, the first flow area S1 increases and the second flow area S2 decreases. Therefore, as the valve stem 2 moves, the area change of the first flow area S1 and the second flow area S2 shows opposite trends, so when the first flow area S1 is too large to cause excessive flow, the second flow area S2 decreases to reduce the flow, and ultimately plays a throttling role.

[0150] The valve body 1 further comprises a valve stem passage wall 11, which can surround at least part of the valve stem passage 14, and a third flow area S3 is formed between the valve stem 2 and the valve stem passage wall 11. It is conceivable that the valve stem passage 14 is in the shape of a regular cylinder, and the valve stem 2 is also in the shape of a regular cylinder, so the size of the third flow area S3 between the two is constant.

[0151] It should be clear that the first flow area S1 refers to the smallest area available for the flow of refrigerant between the valve core 41 and the valve port wall 15 at a certain moment. Similarly, the second flow area S2 refers to the smallest area available for the flow of refrigerant between the throttling structure 3 and the matching portion 22 at a certain moment, and the third flow area S3 refers to the smallest area available for the flow of refrigerant between the valve stem 2 and the valve stem passage wall 11 at a certain moment.

[0152] During the operation of the thermal expansion valve, the valve stem 2 has at least one of the following positions:

[0153] The first position, the first flow area S1 = 0;

[0154] The second position, the first flow area S1 < the third flow area S3;

[0155] The third position, the first flow area S1 is greater than or equal to the third flow area S3, and the third flow area S3 is greater than the second flow area S2.

[0156] Specifically, when the thermal expansion valve is not opened, the valve rod 2 is in the first position, and the valve core 41 abuts against the valve port wall 15, so that the first flow area S1 is 0. Then, the thermal expansion valve is just opened, and the valve rod 2 is in the second position, and the valve rod 2 drives the valve core 41 to move a certain distance, so that the valve core 41 is spaced from the valve port wall 15, and the first flow area S1 is greater than 0, but the first flow area S1 is less than the third flow area S3. It needs to be clear that, since the first flow area S1 is less than the third flow area S3, the first flow area S1 controls the size of the refrigerant flow, and is in the normal working state of the thermal expansion valve, that is, the throttling structure 3 does not need to play a throttling role at this time. Then, the valve rod 2 is in the third position, and the valve rod 2 drives the valve core 41 to move a large distance, so that the valve core 41 is spaced far away from the valve port wall 15, and the first flow area S1 is greater than or equal to the third flow area S3. It needs to be clear that, at this time, the third flow area S3 controls the size of the refrigerant flow, and has deviated from the normal working state of the thermal expansion valve, and the refrigerant flow is too large, so that the throttling structure 3 needs to be throttled, that is, the third flow area S3 is greater than the second flow area S2. The second flow area S2 with a smaller area can reduce the flow of the refrigerant, so as to play a throttling effect when the valve rod 2 is in the third position.

[0157] Please refer to Figure 23 The utility model also provides a kind of thermal management system, including evaporator 8, and above-mentioned valve device. The flow path defined between throttling structure 3 and valve body 1 is located in the upstream of evaporator 8, that is, refrigerant will flow through the flow path between throttling structure 3 and valve body 1 before flowing into evaporator 8, so that when throttling structure 3 throttles the flow of refrigerant, the throttled refrigerant will not appear the case of insufficient heat exchange when entering evaporator 8.

[0158] In addition, the thermal management system further includes a condenser 7 and a compressor 9. The fluid outlet of the condenser 7 is in communication with the second channel 16, the second channel 16 is in communication with the valve chamber 19, the valve chamber 19 is capable of being in communication with the first channel 13, the first channel 13 is in communication with the fluid inlet of the evaporator 8, the fluid outlet of the evaporator 8 is in communication with the third channel 17, the third channel 17 is in communication with the fourth channel 18, and the fourth channel 18 is in communication with the fluid inlet of the compressor 9. It can be conceived that the refrigerant after heat exchange in the evaporator 8 will enter the compressor 9 through the third channel 17 and the fourth channel 18, and the throttled refrigerant will not cause liquid hammering when entering the compressor 9, thereby protecting the thermal management system.

[0159] It should be noted that: the above implementation is only used to illustrate the utility model and is not limited to the technical solutions described in the utility model, for example, the definition of "front", "back", "left", "right", "up", "down" and other directionalities, although the utility model has been described in the above implementation, but those skilled in the art should understand that those skilled in the art can still modify, combine or equivalently replace the utility model, and all technical solutions and improvements that do not deviate from the spirit and scope of the utility model should be covered within the scope of the utility model.

Claims

1. A valve device, characterized by The valve body (1) has a first passage wall (12) and a valve port wall (15), which are arranged in the axial direction of the valve body (1) and are spaced apart, at least part of the valve core (41) is located on the side of the valve port wall (15) away from the first passage wall (12), and the throttling structure (3) is located on the side of the first passage wall (12) away from the valve port wall (15), or the valve core (41) is located on the side of the valve port wall (15) toward the first passage wall (12), and the throttling structure (3) is located on the side of the first passage wall (12) toward the valve port wall (15). The throttling structure (3) defines part of the wall of the flow path. The valve core (41) and the valve port wall (15) form a first flow area S1, and the throttling structure (3) and the valve body (1) form a second flow area S2; the first flow area S1 decreases with the movement of the valve stem (2), the second flow area S2 increases with the movement of the valve stem (2), or the first flow area S1 increases with the movement of the valve stem (2), and the second flow area S2 decreases with the movement of the valve stem (2).

2. The valve device according to claim 1, characterized in that The valve body (1) further comprises a valve stem passage wall (11), and the valve stem (2) and the valve stem passage wall (11) form a third flow area S3.

3. The valve device of claim 1, wherein The valve stem (2) has at least one of the following positions: First position, first flow area S1=0; Second position, first flow area S1<Third flow area S3; Third position, first flow area S1≥Third flow area S3>Second flow area S2. The throttling structure (3) has a throttling portion (32), and the outer diameter of the throttling portion (32) near the valve core (41) side is smaller than the outer diameter of the throttling portion (32) away from the valve core (41) side in the axial direction of the valve body (1).

4. Valve device according to any one of claims 1-3, characterized in that The throttling structure (3) comprises a throttling portion (32) and a mounting portion (31) fixed with the throttling portion (32), the mounting portion (31) is fixed with the valve stem (2), the throttling portion (32) is at least one, and the throttling portion (32) extends in a circle with the valve stem (2) as the center.

5. Valve device according to any of claims 1-3, characterized in that ​ 6. Valve device according to any of claims 1-3, characterized in that The valve body (1) further comprises a valve stem passage wall (11), the first passage wall (12) surrounds a first passage (13), the throttling structure (3) has a throttling portion (32), the outer diameter of the throttling portion (32) is greater than the diameter of the valve stem passage wall (11), and the throttling structure (3) is located in the first passage (13); along the circumference of the valve stem (2), the central angle of the throttling portion (32) is less than 360°, and the space between the throttling portion (32) and the first passage wall (12) and between the throttling portions (32) jointly forms a second flow area S2. Alternatively, the valve stem passage wall (11) surrounds a valve stem passage (14), the throttling structure (3) has a throttling portion (32), the outer diameter of the throttling portion (32) is less than the diameter of the valve stem passage wall (11), and at least part of the throttling portion (32) can be located in the valve stem passage (14); along the circumference of the valve stem (2), the central angle of the throttling portion (32) is less than 360°, and the space between the throttling portion (32) and the valve stem passage wall (11) and between the throttling portions (32) jointly forms a second flow area S2.

7. Valve device according to any of claims 1-3, characterized in that The valve body (1) further comprises a valve stem passage wall (11), the first passage wall (12) surrounds a first passage (13), the throttling structure (3) has a throttling portion (32), the outer diameter of the throttling portion (32) is greater than the diameter of the valve stem passage wall (11), and the throttling structure (3) is located in the first passage (13); along the circumference of the valve stem (2), the central angle of the throttling portion (32) is equal to 360°, the throttling portion (32) is spaced apart from the first passage wall (12), and the throttling portion (32) and the first passage wall (12) form a second flow area S2; Alternatively, the valve stem passage wall (11) surrounds a valve stem passage (14), the throttling structure (3) has a throttling portion (32), the outer diameter of the throttling portion (32) is less than the diameter of the valve stem passage wall (11), and at least part of the throttling portion (32) is located in the valve stem passage (14); along the circumference of the valve stem (2), the central angle of the throttling portion (32) is equal to 360°, the throttling portion (32) is spaced apart from the valve stem passage wall (11), and the throttling portion (32) and the valve stem passage wall (11) form a second flow area S2.

8. The valve device of claim 1, wherein The valve device is a thermal expansion valve, comprising a gas tank head (6), the gas tank head (6) comprises a gas tank cover (61), a gas tank seat (62), a diaphragm (63), a transmission block (64), the gas tank cover (61) is fixed with the gas tank seat (62), the diaphragm (63) is located between the gas tank cover (61) and the gas tank seat (62), and the gas tank cover (61) and the diaphragm (63) surround a closed chamber (65), the closed chamber (65) is filled with temperature-sensitive gas, the gas tank seat (62) and the diaphragm (63) surround an equal pressure chamber (66), the transmission block (64) abuts against the diaphragm (63), one end of the valve stem (2) abuts against the transmission block (64), and the other end of the valve stem (2) abuts against the valve core (41).

9. A valve device characterized by The valve device comprises a valve body (1), a valve stem (2), a throttling structure (3), and a valve core (41), the valve stem (2) abuts against the valve core (41), the valve stem (2) is movably arranged in the valve body (1), the throttling structure (3) is located in the valve body (1), and the valve stem (2) has a matching part (22); The valve body (1) has a first passage wall (12) and a valve port wall (15), and along the axial direction of the valve body (1), the first passage wall (12) is arranged apart from the valve port wall (15); at least part of the valve core (41) is located on the side of the valve port wall (15) away from the first passage wall (12), and the throttling structure (3) is located on the side of the first passage wall (12) away from the valve port wall (15), or the valve core (41) is located on the side of the valve port wall (15) facing the first passage wall (12), and the throttling structure (3) is located on the side of the first passage wall (12) facing the valve port wall (15); The throttling structure (3) defines part of the wall of the flow path.

10. The valve device of claim 9, wherein The valve core (41) and the valve port wall (15) form a first flow area S1, and the throttling structure (3) and the matching part (22) form a second flow area S2; the first flow area S1 decreases with the movement of the valve stem (2), the second flow area S2 increases with the movement of the valve stem (2), or the first flow area S1 increases with the movement of the valve stem (2), and the second flow area S2 decreases with the movement of the valve stem (2).

11. The valve device of claim 9, wherein The valve body (1) further comprises a valve stem passage wall (11), and the valve stem (2) and the valve stem passage wall (11) form a third flow area S3; The valve stem (2) has at least one of the following positions: A first position, the first flow area S1 = 0; A second position, the first flow area S1 < the third flow area S3; A third position, the first flow area S1 ≥ the third flow area S3 > the second flow area S2.

12. A thermal management system characterized by, The valve device comprises an evaporator (8) and any one of claims 1-11, and the flow path defined between the throttling structure (3) and the valve body (1) is located upstream of the evaporator (8).

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