Reversing valve

Abstract

The utility model relates to the technical field of fluid control, in particular to a reversing valve. The reversing valve comprises a valve body and a valve element, the valve body is provided with a valve cavity and a plurality of valve holes, the valve holes are distributed along the circumferential side of the valve cavity at intervals and communicated with the valve cavity, and the valve element is rotatably installed in the valve cavity and used for being communicated with the different valve holes. In the radial direction of the valve element, the side wall of the valve element and the inner wall of the valve cavity are arranged at intervals to form impurity discharging gaps. In addition, in the axial direction of the valve element, the end face of the valve element and the inner wall of the valve cavity are arranged at intervals to form impurity containing spaces, and the impurity containing spaces communicate with the impurity discharging gap. According to the reversing valve, the problem that after an existing reversing valve is used for a long time, impurities easily enter the space between the valve element and the valve body, and consequently the valve element is stuck is solved.

Description

Technical Field

[0001] The present application relates to the technical field of fluid control, and in particular to a reversing valve. Background Art

[0002] At present, in vehicle air-conditioning systems, a rotary reversing valve is often used to adjust the flow direction of the refrigerant to achieve switching between the cooling mode and the heating mode of the air-conditioning system.

[0003] The reversing valve in the related art includes a valve body and a valve core. The valve body is provided with a valve cavity and a plurality of valve holes. The valve core is rotatably arranged in the valve cavity to connect different valve holes, thereby realizing the switching of the flow path. Usually, after long-term use of the reversing valve, impurities often enter between the valve core and the valve body. The presence of impurities will increase the torque of the valve core rotation, and even cause the valve core to get stuck, thereby greatly affecting the normal operation of the reversing valve. Utility Model Content

[0004] Based on this, it is necessary to provide a reversing valve to solve the problem that after long-term use of the existing reversing valve, impurities easily enter between the valve core and the valve body, causing the valve core to get stuck.

[0005] The present application provides a reversing valve, which includes a valve body and a valve core. The valve body is provided with a valve cavity and a plurality of valve holes. The plurality of valve holes are distributed at intervals along the circumference of the valve cavity and are connected to the valve cavity. The valve core is rotatably installed in the valve cavity for connecting different valve holes. Along the radial direction of the valve core, the side wall of the valve core and the inner wall of the valve cavity are spaced apart to form an impurity removal gap. And, along the axial direction of the valve core, the end face of the valve core and the inner wall of the valve cavity are spaced apart to form an impurity accommodating space, and the impurity accommodating space is connected to the impurity removal gap.

[0006] In one embodiment, a sealing assembly is provided in the valve hole, one end of the sealing assembly is limitedly connected to the inner wall of the valve hole, and the other end at least partially protrudes from the inner wall of the valve cavity and is movably sealed against the outer wall of the valve core; wherein the impurity removal gap is formed between the sealing assembly, the valve core and the inner wall of the valve cavity.

[0007] In one embodiment, the valve core includes a main body and a support portion connected to one end of the main body, the inner wall of the valve cavity is provided with a support hole, the support portion is inserted into the support hole and is rotatably connected to the support hole; wherein the main body and the inner wall of the valve cavity are spaced apart to form the impurity accommodating space.

[0008] In one of the embodiments, a boss is provided around the supporting hole, the boss protrudes and is connected to the inner wall of the valve cavity, and the outer wall of the boss, the main body and the inner wall of the valve cavity can enclose the impurity containing space; wherein the supporting hole passes through the boss.

[0009] In one of the embodiments, the end surface of the boss is in abutment with the main body.

[0010] In one embodiment, the reversing valve further includes a gear set and a fixed plate, wherein the gear set and the fixed plate are both disposed in the valve cavity, and the gear set is connected to the fixed plate, and the fixed plate is detachably connected to the valve body; wherein the valve core is installed at one end of the fixed plate away from the gear set, and can rotate around its own axis in response to the drive of the gear set.

[0011] In one of the embodiments, the fixing plate is provided with a through hole coaxially arranged with the supporting hole, and the valve core also includes a driving part, the driving part is connected to the end of the main body away from the supporting part, and the driving part passes through the through hole and is rotatably connected with the through hole; wherein the driving part is transmission-connected to the output end of the gear set.

[0012] In one embodiment, the outer peripheral sleeve of the support part is provided with a first bearing, and the support part is rotatably connected to the support hole through the first bearing; and / or, the outer peripheral sleeve of the driving part is provided with a second bearing, and the driving part is rotatably connected to the through hole through the second bearing.

[0013] In one embodiment, the gear set includes a plurality of gears, and the gear in the gear set that is directly connected to the valve core is defined as an output wheel, a limiting groove is provided on the fixed plate, and one of the output wheel and the valve core is provided with a limiting column, and the limiting column is inserted in the limiting groove and can cooperate with the limiting groove stop along the circumference of the valve core; or, a limiting column is provided on the fixed plate, and a limiting groove is provided on one of the output wheel and the valve core, and the limiting column is inserted in the limiting groove and can cooperate with the limiting groove stop along the circumference of the valve core.

[0014] In one of the embodiments, the reversing valve also includes a support plate, which is spaced apart from and connected to the fixed plate, and the gear set is installed between the support plate and the fixed plate; the reversing valve also includes a motor rotor and a support, both ends of the support are respectively abutted against the motor rotor and the support plate, and the output shaft of the motor rotor passes through the support and the support plate and is connected to the gear set.

[0015] In one of the embodiments, the valve body includes a first mounting body and a second mounting body which are separately arranged, and the first mounting body is sealedly connected to the second mounting body; wherein the first mounting body and the second mounting body surround and form the valve cavity.

[0016] In one embodiment, the first mounting body and the second mounting body are surrounded by a first sealing groove and a second sealing groove that are interconnected; the valve body also includes a first sealing ring and a second sealing ring, the first sealing ring is installed in the first sealing groove, the second sealing ring is installed in the second sealing groove, and at least a portion of the first sealing ring is abutted against the second sealing ring to seal the first mounting body and the second mounting body.

[0017] In one embodiment, the first sealing groove is located between the valve cavity and the second sealing groove, and the cross-sectional area of ​​the first sealing ring is greater than the cross-sectional area of ​​the second sealing ring.

[0018] Compared with the prior art, the reversing valve provided in the present application sets an impurity removal gap and an impurity containing space, so that impurities can smoothly pass through the impurity removal gap into the impurity containing space, thereby preventing the impurities from hindering the rotation of the valve core and greatly improving the reliability of the valve core during rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A cross-sectional view of a reversing valve according to an embodiment of the present application;

[0021] Figure 2 A cross-sectional view of a reversing valve according to another embodiment of the present application;

[0022] Figure 3 A partial structural schematic diagram of a reversing valve according to an embodiment of the present application;

[0023] Figure 4 A cross-sectional view from another direction of a reversing valve according to an embodiment of the present application.

[0024] The symbols in the figure mean the following:

[0025] 100, reversing valve; 10, valve core; 101, flow channel; 101a, first flow channel; 101b, second flow channel; 11, main body; 12, support part; 13, drive part; 14, first bearing; 15, second bearing; 20, valve body; 201, valve cavity; 2011, impurity removal gap; 2012, impurity containing space; 2013, support hole; 202, valve hole; 202a, first valve hole; 202b, second valve hole; 202c, third valve hole; 202d, fourth valve hole; 2021, first groove; 203, first sealing groove; 204, second sealing groove Sealing groove; 21, first mounting body; 22, second mounting body; 23, boss; 24, first sealing ring; 25, second sealing ring; 30, sealing assembly; 301, flow hole; 31, elastic member; 32, first sealing member; 3201, second groove; 33, second sealing member; 34, retaining ring; 40, driving mechanism; 41, motor coil; 42, motor rotor; 43, support; 50, reduction mechanism; 51, gear set; 5101, limiting groove; 511, output wheel; 52, fixing plate; 5201, through hole; 521, limiting column; 53, support plate. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0027] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0029] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are in contact indirectly through an intermediate medium. Moreover, a first feature being “above”, “above”, or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0031] At present, in vehicle air-conditioning systems, a rotary reversing valve is often used to adjust the flow direction of the refrigerant to achieve switching between the cooling mode and the heating mode of the air-conditioning system.

[0032] The reversing valve in the related art includes a valve body and a valve core. The valve body is provided with a valve cavity and a plurality of valve holes. The valve core is rotatably arranged in the valve cavity to connect different valve holes, thereby realizing the switching of the flow path. Usually, after long-term use of the reversing valve, impurities often enter between the valve core and the valve body. The presence of impurities will increase the torque of the valve core rotation, and even cause the valve core to get stuck, which greatly affects the normal operation of the reversing valve.

[0033] See also Figure 1-Figure 4 In order to solve the problem that impurities easily enter between the valve core and the valve body of the existing reversing valve after long-term use, causing the valve core to get stuck, the present application provides a reversing valve 100, which is mainly used in vehicle air conditioning systems. The reversing valve 100 includes a valve body 20 and a valve core 10, the valve body 20 is provided with a valve cavity 201 and a plurality of valve holes 202, the plurality of valve holes 202 are distributed along the circumference of the valve cavity 201 and communicate with the valve cavity 201, and the valve core 10 is rotatably installed in the valve cavity 201 for communicating with different valve holes 202.

[0034] Specifically, the valve body 20 of the present application is provided with four valve holes 202, and the four valve holes 202 are distributed in a cross shape. A plurality of flow channels 101 can be provided in the valve core 10. The present application specifically provides two flow channels 101, and they are defined as the first flow channel 101a and the second flow channel 101b, respectively, wherein the two openings of the first flow channel 101a and the two openings of the second flow channel 101b are distributed in a cross shape to match the valve holes 202, and the first flow channel 101a and the second flow channel 101b are both basically extended in an arc shape. In this way, by rotating the valve core 10 around its own axis, the first flow channel 101a and the second flow channel 101b on the valve core 10 can connect to different valve holes 202, thereby realizing the switching between the cooling mode and the heating mode.

[0035] Furthermore, along the radial direction of the valve core 10, the side wall of the valve core 10 and the inner wall of the valve cavity 201 are provided to form an impurity removal gap 2011. In addition, along the axial direction of the valve core 10, the end face of the valve core 10 and the inner wall of the valve cavity 201 are provided to form an impurity containing space 2012, and the impurity containing space 2012 is communicated with the impurity removal gap 2011. In this way, by providing the impurity removal gap 2011 and the impurity containing space 2012, impurities can smoothly pass through the impurity removal gap 2011 into the impurity containing space 2012, thereby preventing the impurities from hindering the rotation of the valve core 10, and greatly improving the reliability of the valve core 10 when rotating.

[0036] It should be noted that when the reversing valve 100 of the present application is installed, the axial direction of the valve core 10 is usually parallel to the direction of gravity, so that impurities entering the impurity removal gap 2011 can automatically accumulate in the impurity containing space 2012 under the action of their own gravity.

[0037] Since there is an impurity removal gap 2011 between the side wall of the valve core 10 and the inner wall of the valve cavity 201, in order to prevent the refrigerant from flowing into the impurity removal gap 2011 and causing the medium to flow through, in one embodiment, as shown in FIG. Figure 1 and Figure 2 As shown, a sealing component 30 is provided in the valve hole 202, one end of the sealing component 30 is limitedly connected to the inner wall of the valve hole 202, and the other end at least partially protrudes from the inner wall of the valve cavity 201 and is in active sealing contact with the outer wall of the valve core 10. Among them, an impurity-removing gap 2011 is formed between the sealing component 30, the valve core 10 and the inner wall of the valve cavity 201. In this way, the sealing of the connection between the valve hole 202 and the valve core 10 is achieved by the sealing component 30, which can ensure that the refrigerant flows between the valve hole 202 and the valve core 10 along the predetermined flow channel 101, thereby greatly improving the reliability of the reversing valve 100.

[0038] It can be understood that the sealing assembly 30 is provided with a flow hole 301 for the circulation of the refrigerant. As the valve core 10 rotates, the flow hole 301 can be connected with different flow channels 101 on the valve core 10, thereby realizing the smooth flow of the refrigerant. Among them, the present application preferably sets the inner diameter of the flow hole 301 and the flow channel 101 to be equal to improve the matching effect and sealing performance of the two.

[0039] In order to further improve the sealing effect between the sealing component 30 and the valve core 10, in one embodiment, the outer surface of the valve core 10 and the surface of the sealing component 30 close to one end of the valve core 10 are arranged in an arc shape with the same arc. In this way, the sealing between the valve core 10 and the sealing component 30 is facilitated, and the rotation of the valve core 10 is also facilitated.

[0040] In one embodiment, the sealing assembly 30 includes an elastic member 31 and a first sealing member 32. A first groove 2021 is provided in the valve hole 202, which is recessed in a direction away from the axis of the valve hole 202. One end of the elastic member 31 is clamped in the first groove 2021, and the other end is abutted against the first sealing member 32. In addition, the elastic member 31 can exert a force on the first sealing member 32 in a direction close to the valve core 10, so that the first sealing member 32 fits tightly with the valve core 10. In this way, the sealing performance between the valve core 10 and the valve hole 202 is greatly improved. In addition, even if the first sealing member 32 is worn after long-term operation, the elastic force of the elastic member 31 can be used to compensate for the wear, further ensuring a good sealing effect between the first sealing member 32 and the valve core 10.

[0041] The flow hole 301 is provided in the first sealing member 32. The elastic member 31 may be a butterfly spring, and the butterfly spring may be installed by setting a snap ring 34 to be clamped in the first groove 2021, and the butterfly spring is pressed against the snap ring 34, so as to achieve stable installation of the elastic member 31. Of course, a connecting portion may be welded or integrally formed at one end of the butterfly spring, and the connecting portion may be clamped in the first groove 2021 for connection, as long as the same effect can be achieved.

[0042] Furthermore, in one embodiment, the outer wall of the first sealing member 32 is provided with a second groove 3201 that is recessed toward the axis of the first sealing member 32. The sealing assembly 30 further includes a second sealing member 33, which is installed in the second groove 3201 and seals with the inner wall of the second groove 3201, and at least a portion of the second sealing member 33 protrudes from the second groove 3201 to seal against the inner wall of the valve hole 202. In this way, the second sealing member 33 can seal the gap between the first sealing member 32 and the inner wall of the valve hole 202, thereby greatly reducing the probability of refrigerant leakage from the gap.

[0043] In one embodiment, if Figure 1 and Figure 2As shown, the valve core 10 includes a main body 11 and a support portion 12 connected to one end of the main body 11, and the inner wall of the valve cavity 201 is provided with a support hole 2013, and the support portion 12 is inserted into the support hole 2013 and is rotatably connected to the support hole 2013. The main body 11 and the inner wall of the valve cavity 201 are arranged to form an impurity accommodating space 2012, and the flow channel 101 on the valve core 10 is arranged on the main body 11. In this way, the valve core 10 can be rotated around the axis to prevent the valve core 10 from being offset, and the support portion 12 can be used to form a gap between the main body 11 and the inner wall of the valve cavity 201, thereby accommodating impurities.

[0044] In one embodiment, if Figure 2 As shown, a boss 23 is provided around the support hole 2013, the boss 23 protrudes and is connected to the inner wall of the valve cavity 201, and a miscellaneous space 2012 can be formed between the outer wall of the boss 23, the main body 11 and the inner wall of the valve cavity 201. The support hole 2013 is set through the boss 23.

[0045] In this way, the influence of impurities on the rotation of the valve element 10 can be reduced.

[0046] To further reduce the effect of impurities on the rotation of the valve core 10 , preferably, in one embodiment, the end surface of the boss 23 and the main body 11 are in abutment with each other to prevent impurities from entering the support hole 2013 and affecting the fit between the support portion 12 and the support hole 2013 .

[0047] Further, in one embodiment, if Figure 1 As shown, the outer periphery of the support portion 12 is sleeved with a first bearing 14, and the support portion 12 is rotatably connected to the support hole 2013 through the first bearing 14. In this way, the first bearing 14 can be used to further prevent the valve core 10 from deflecting during rotation, effectively improving the reliability of the rotation of the valve core 10.

[0048] In one embodiment, if Figure 1 As shown, the reversing valve 100 also includes a driving mechanism 40, which includes a motor coil 41 and a motor rotor 42 magnetically matched with the motor coil 41. The motor coil 41 is detachably mounted on the outside of the valve body 20, and the motor rotor 42 is installed in the valve body 20 and can rotate under the drive of the motor coil 41.

[0049] In order to increase the rotational driving force of the valve core 10, in one embodiment, the reversing valve 100 further includes a speed reduction mechanism 50 to increase the torque of the valve core 10 through the speed reduction mechanism 50. In this way, the size of the motor coil 41 can be reduced while ensuring the driving force of the valve core 10.

[0050] Specifically, the speed reduction mechanism 50 includes a gear set 51 and a fixed plate 52, both of which are arranged in the valve cavity 201, and the gear set 51 is connected to the fixed plate 52, and the fixed plate 52 is detachably connected to the valve body 20. The valve core 10 is installed at one end of the fixed plate 52 away from the gear set 51, and can rotate around its own axis in response to the drive of the gear set 51.

[0051] That is, the speed reduction mechanism 50 is detachably connected to the valve body 20, which facilitates the disassembly and installation of the speed reduction mechanism 50, thereby facilitating the adjustment of the speed reduction ratio of the speed reduction mechanism 50 according to actual needs. In addition, the improvement of the speed of disassembly of the speed reduction mechanism 50 can also improve the speed of disassembly of the valve core 10, thereby facilitating the cleaning of impurities in the impurity space 2012.

[0052] Furthermore, in one embodiment, the driving mechanism 40 further includes a support 43, the speed reduction mechanism 50 further includes a support plate 53, the support plate 53 is spaced apart from the fixing plate 52 and connected to the fixing plate 52, and the gear set 51 is installed between the support plate 53 and the fixing plate 52. Both ends of the support 43 abut against the motor rotor 42 and the support plate 53 respectively, and the output shaft of the motor rotor 42 passes through the support 43 and the support plate 53 and is connected to the gear set 51.

[0053] In this way, the support 43 can achieve axial limitation of the motor rotor 42 through abutment with the support plate 53 and the motor rotor 42. At the same time, the support plate 53 can also achieve radial limitation of the motor rotor 42, thereby greatly improving the positioning reliability of the motor rotor 42 and facilitating the driving of the motor rotor 42.

[0054] Specifically, since the support plate 53 is limited between the lower end surface of the support 43 and the upper end surface of the gear set 51, the relative position of the support plate 53 and the fixed plate 52 remains unchanged, and the output shaft of the motor rotor 42 is fixed to the gear set 51. Therefore, when the support 43 is respectively in contact with the support plate 53 and the motor rotor 42, the motor rotor 42 can be axially positioned through the support 43 and the support plate 53.

[0055] In one embodiment, the valve body 20 includes a first mounting body 21 and a second mounting body 22 which are separately arranged, and the first mounting body 21 is sealedly connected to the second mounting body 22. The first mounting body 21 and the second mounting body 22 are arranged to form a valve cavity 201.

[0056] In this way, the installation of the valve core 10 and the speed reduction mechanism 50 etc. is facilitated, and the overall assembly efficiency can be improved.

[0057] Specifically, the fixing plate 52 is detachably connected to the second mounting body 22 by fasteners, etc., and the valve cavity 201 is divided into two parts, one of which is used to install the valve core 10, and the other is used to install the gear set 51. During installation, the valve core 10 can be placed in the second mounting body 22 first, and then the fixing plate 52 is connected to the second mounting body 22, and the positioning between the fixing plate 52 and the valve core 10 is achieved simultaneously. The gear set 51 can be pre-installed on the fixing plate 52 or installed after the fixing plate 52 is assembled. Finally, the first mounting body 21 is sealed and connected to the second mounting body 22.

[0058] To ensure the reliability of the seal between the first mounting body 21 and the second mounting body 22, in one embodiment, Figure 1 As shown, the first mounting body 21 and the second mounting body 22 are surrounded by a first sealing groove 203 and a second sealing groove 204 that are connected to each other. The valve body 20 also includes a first sealing ring 24 and a second sealing ring 25. The first sealing ring 24 is installed in the first sealing groove 203, and the second sealing ring 25 is installed in the second sealing groove 204. At least part of the first sealing ring 24 abuts against the second sealing ring 25 to seal the first mounting body 21 and the second mounting body 22. In the radial direction of the reversing valve 100, the first sealing groove 203 is preferably arranged on the side of the second sealing groove 204 close to the valve cavity 201.

[0059] That is, in this embodiment, two sealing rings are used to achieve sealing cooperation between the first mounting body 21 and the second mounting body 22, which greatly improves the sealing reliability of the valve body 20, thereby effectively reducing the probability of refrigerant leakage. In addition, since the first sealing ring 24 will deform and fail after long-term use, the first sealing ring 24 and the second sealing ring 25 are abutted and matched, and the failed first sealing ring 24 can squeeze the second sealing ring 25, thereby improving the sealing effect of the second sealing ring 25.

[0060] Furthermore, in one embodiment, the first sealing groove 203 is located between the valve cavity 201 and the second sealing groove 204. At this time, by setting the cross-sectional area of ​​the first sealing ring 24 to be larger than the cross-sectional area of ​​the second sealing ring 25, the extrusion effect of the first sealing ring 24 on the second sealing ring 25 after deformation can be improved, thereby further improving the sealing performance of the second sealing ring 25.

[0061] Of course, in other embodiments, the first sealing groove 203 and the second sealing groove 204 may also be Figure 2 As shown, they are arranged at intervals as long as they can achieve the same sealing effect.

[0062] In one embodiment, if Figure 1 and Figure 2As shown, the fixing plate 52 is provided with a through hole 5201 coaxially arranged with the support hole 2013. The valve core 10 further includes a driving portion 13, which is connected to an end of the main body 11 away from the support portion 12, and the driving portion 13 penetrates the through hole 5201 and is rotatably connected to the through hole 5201. The driving portion 13 is transmission-connected to the output end of the gear set 51. Through the cooperation between the driving portion 13 and the support portion 12, the stability of the rotation of the valve core 10 can be further improved.

[0063] Since the gear set 51 includes multiple gears, the gear in the gear set 51 that is directly connected to the valve core 10 is defined here as the output wheel 511, wherein the anti-rotation fit between the gear set 51 and the valve core 10 can be achieved by setting the shape of the hole on the output wheel 511 and the corresponding position on the driving part 13 to a polygon, such as a triangle, a quadrilateral or a pentagon.

[0064] In order to further improve the coaxiality of the valve core 10 during rotation, in one embodiment, Figure 1 As shown, a second bearing 15 is sleeved on the outer periphery of the driving portion 13 , and the driving portion 13 is rotatably connected to the through hole 5201 via the second bearing 15 .

[0065] Exemplarily, both the first bearing 14 and the second bearing 15 may be common plane bearings to reduce costs.

[0066] In one embodiment, if Figure 3 As shown, a limiting column 521 is provided on the fixing plate 52 , and a limiting groove 5101 is provided on the output wheel 511 . The limiting column 521 is inserted into the limiting groove 5101 and can cooperate with the limiting groove 5101 along the circumference of the valve core 10 to stop.

[0067] It is understandable that when the limiting column 521 moves to the groove walls at both ends of the limiting groove 5101 and abuts against the groove walls of the limiting groove 5101, the movement of the limiting column 521 can be limited, and at this time, the motor coil 41 of the driving mechanism 40 is powered off. That is, the rotation drive of the valve core 10 is limited by the cooperation of the limiting column 521 and the limiting groove 5101, thereby effectively improving the rotation accuracy of the valve core 10 when switching the flow path.

[0068] Since four valve holes 202 are specifically provided in the present application, and the flow path can be switched when the valve core 10 rotates 90° around the axis, the arc range of the limiting groove 5101 can also be set to 90°.

[0069] In another embodiment, the limiting groove 5101 may also be opened in the valve core 10 . In this case, the limiting column 521 is connected to the surface of the fixing plate 52 close to one end of the valve core 10 to cooperate with the limiting groove 5101 to prevent rotation.

[0070] Of course, in other embodiments, a limiting groove 5101 may be provided on the fixing plate 52 , and a limiting column 521 may be provided on one of the output wheel 511 and the valve core 10 . In this way, the valve core 10 can also be prevented from rotating.

[0071] The reversing valve 100 provided in the present application is mainly used in a vehicle air-conditioning system, wherein the vehicle air-conditioning system also includes a compressor, an outdoor heat exchanger and an indoor heat exchanger. The reversing valve 100 is used to change the flow direction of the refrigerant flowing out of the compressor to switch the cooling and heating modes of the system.

[0072] For ease of description, the present application defines the four valve holes 202 distributed in the circumferential direction on the valve body 20 of the reversing valve 100 as the first valve hole 202a, the second valve hole 202b, the third valve hole 202c and the fourth valve hole 202d. Figure 4 As shown, the first valve hole 202a can be connected to the second valve hole 202b through the first flow channel 101a, and at this time, the third valve hole 202c can be connected to the fourth valve hole 202d through the second flow channel 101b. Alternatively, the first valve hole 202a is connected to the fourth valve hole 202d through the second flow channel 101b, and at this time, the third valve hole 202c can be connected to the second valve hole 202b through the first flow channel 101a.

[0073] Here, the first valve hole 202a is connected to the outlet of the compressor, the third valve hole 202c is connected to the inlet of the compressor, the second valve hole 202b is connected to the outdoor heat exchanger, and the fourth valve hole 202d is connected to the indoor heat exchanger.

[0074] When the vehicle air-conditioning system is in the cooling state, the high-pressure refrigerant discharged from the compressor outlet enters the first flow channel 101a from the first valve hole 202a on the reversing valve 100, then flows out from the second valve hole 202b and exchanges heat in the outdoor heat exchanger and the indoor heat exchanger in turn, then flows out of the reversing valve 100 through the fourth valve hole 202d, the second flow channel 101b, and the third valve hole 202c of the reversing valve 100 and enters the compressor from the compressor inlet.

[0075] When the vehicle air-conditioning system is in the heating state, the high-pressure refrigerant discharged from the compressor outlet enters the second flow channel 101b from the first valve hole 202a on the reversing valve 100, then flows out from the fourth valve hole 202d and exchanges heat in the in-vehicle heat exchanger and the out-vehicle heat exchanger in turn, then flows out of the reversing valve 100 through the second valve hole 202b, the first flow channel 101a, and the third valve hole 202c of the reversing valve 100 and enters the compressor from the compressor inlet.

[0076] Among them, the driving mechanism 40 and the reduction mechanism 50 drive the valve core 10 to rotate. Specifically, the motor coil 41 is energized to drive the motor rotor 42 to rotate clockwise or counterclockwise. At this time, the output shaft of the motor rotor 42 can drive the gear set 51 to rotate, thereby driving the valve core 10 to rotate accordingly, thereby realizing the switching of the flow path.

[0077] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0078] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A reversing valve, comprising a valve body (20) and a valve core (10), wherein the valve body (20) is provided with a valve cavity (201) and a plurality of valve holes (202), wherein the plurality of valve holes (202) are distributed at intervals along the circumference of the valve cavity (201) and are in communication with the valve cavity (201), and the valve core (10) is rotatably mounted in the valve cavity (201) and is used to communicate with different valve holes (202); It is characterized in that Along the radial direction of the valve core (10), the side wall of the valve core (10) and the inner wall of the valve cavity (201) are spaced apart to form an impurity removal gap (2011); and, along the axial direction of the valve core (10), the end face of the valve core (10) and the inner wall of the valve cavity (201) are spaced apart to form an impurity containing space (2012), and the impurity containing space (2012) is communicated with the impurity removal gap (2011).

2. The reversing valve according to claim 1, characterized in that: A sealing component (30) is provided in the valve hole (202), one end of the sealing component (30) is limitedly connected to the inner wall of the valve hole (202), and the other end at least partially protrudes from the inner wall of the valve cavity (201) and is movably sealed against the outer wall of the valve core (10); The impurity removal gap (2011) is formed between the sealing component (30), the valve core (10) and the inner wall of the valve cavity (201).

3. The reversing valve according to claim 1, characterized in that: The valve core (10) comprises a main body (11) and a support portion (12) connected to one end of the main body (11); a support hole (2013) is provided on the inner wall of the valve cavity (201); the support portion (12) is inserted into the support hole (2013) and is rotatably connected to the support hole (2013); The main body (11) and the inner wall of the valve cavity (201) are spaced apart to form the impurity containing space (2012).

4. The reversing valve according to claim 3, characterized in that: A boss (23) is provided around the supporting hole (2013), the boss (23) protrudes and is connected to the inner wall of the valve cavity (201), and the outer wall of the boss (23), the main body (11) and the inner wall of the valve cavity (201) can be surrounded to form the impurity containing space (2012); Wherein, the supporting hole (2013) is arranged through the boss (23).

5. The reversing valve according to claim 4, characterized in that: The end surface of the boss (23) is in abutment with the main body (11).

6. The reversing valve according to claim 3, characterized in that: The reversing valve further comprises a gear set (51) and a fixing plate (52), wherein the gear set (51) and the fixing plate (52) are both arranged in the valve cavity (201), and the gear set (51) is connected to the fixing plate (52), and the fixing plate (52) is detachably connected to the valve body (20); The valve core (10) is mounted on an end of the fixed plate (52) away from the gear set (51), and can rotate around its own axis in response to the drive of the gear set (51).

7. The reversing valve according to claim 6, characterized in that: The fixing plate (52) is provided with a through hole (5201) coaxially arranged with the supporting hole (2013); the valve core (10) further comprises a driving portion (13); the driving portion (13) is connected to an end of the main body (11) away from the supporting portion (12); and the driving portion (13) passes through the through hole (5201) and is rotatably connected to the through hole (5201); Wherein, the driving part (13) is transmission-connected to the output end of the gear set (51).

8. The reversing valve according to claim 7, characterized in that: The outer periphery of the support portion (12) is sleeved with a first bearing (14), and the support portion (12) is rotatably connected to the support hole (2013) via the first bearing (14); And / or, a second bearing (15) is sleeved on the outer periphery of the driving part (13), and the driving part (13) is rotatably connected to the through hole (5201) via the second bearing (15).

9. The reversing valve according to claim 6, characterized in that: The gear set (51) comprises a plurality of gears, and the gear in the gear set (51) that is directly connected to the valve core (10) is defined as an output wheel (511); a limiting groove (5101) is provided on the fixing plate (52); a limiting column (521) is provided on one of the output wheel (511) and the valve core (10); the limiting column (521) is inserted into the limiting groove (5101) and can cooperate with the limiting groove (5101) along the circumference of the valve core (10); Alternatively, a limiting column (521) is provided on the fixing plate (52), and a limiting groove (5101) is provided on one of the output wheel (511) and the valve core (10), and the limiting column (521) is inserted into the limiting groove (5101) and can cooperate with the limiting groove (5101) stopper along the circumference of the valve core (10).

10. The reversing valve according to claim 6, characterized in that: The reversing valve further comprises a support plate (53), wherein the support plate (53) is spaced apart from the fixing plate (52) and connected to the fixing plate (52), and the gear set (51) is installed between the support plate (53) and the fixing plate (52); The reversing valve further comprises a motor rotor (42) and a support (43), two ends of the support (43) respectively abut against the motor rotor (42) and the support plate (53), and an output shaft of the motor rotor (42) passes through the support (43) and the support plate (53) and is connected to the gear set (51).

11. The reversing valve according to claim 1, characterized in that: The valve body (20) comprises a first mounting body (21) and a second mounting body (22) which are separately arranged, and the first mounting body (21) is sealedly connected to the second mounting body (22); Wherein, the first mounting body (21) and the second mounting body (22) are arranged to enclose and form the valve chamber (201).

12. The reversing valve according to claim 11, characterized in that: The first installation body (21) and the second installation body (22) form a first sealing groove (203) and a second sealing groove (204) which are communicated with each other; The valve body (20) further comprises a first sealing ring (24) and a second sealing ring (25), wherein the first sealing ring (24) is installed in the first sealing groove (203), and the second sealing ring (25) is installed in the second sealing groove (204), and at least a portion of the first sealing ring (24) is abutted against the second sealing ring (25) to seal and connect the first mounting body (21) and the second mounting body (22).

13. The reversing valve according to claim 12, characterized in that: The first sealing groove (203) is located between the valve cavity (201) and the second sealing groove (204), and the cross-sectional area of ​​the first sealing ring (24) is greater than the cross-sectional area of ​​the second sealing ring (25).

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