Valve core mechanism of internal flow type reversing valve and reversing valve

Abstract

The utility model discloses an internal flow type reversing valve core mechanism and a reversing valve, the internal flow type reversing valve core mechanism comprises a main body piece, two connecting pieces and two brazing filler metal bodies, the main body piece is provided with two axial flow channels, two groups of first radial holes and two groups of second radial holes; each group of first radial holes and each group of second radial holes are communicated with one axial flow channel, two mounting holes are formed in the main body piece, and each connecting piece is inserted into one mounting hole to block one end part, close to the mounting hole, of the corresponding axial flow channel; the main body piece and the two connecting pieces are brazed into a whole through the two brazing filler metal bodies, and the brazing filler metal bodies are made of brazing filler metal which is melted after being heated and then condensed and solidified. According to the valve element mechanism of the internal flow type reversing valve, the split type design is adopted, the main body piece can be integrally machined, the cylindricity, the concentricity and the size precision of the valve element mechanism can be guaranteed, and compared with the prior art, the machining procedure is simplified, and the overall quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of reversing valves, in particular to an inner flow type reversing valve core mechanism and a reversing valve. Background Art

[0002] The reversing valve can control the flow direction of hydraulic oil by changing the position of the valve core. It is a hydraulic component that controls the on-off and reversing of the oil circuit and is often used in various industries. When the valve core is in the middle position, the valve core separates the oil inlet channel of the valve body from the two channels, and the two channels of the valve body are connected to the oil return channel of the valve body. The valve core of the reversing valve is mostly a cylindrical solid structure. When the pressure of the hydraulic oil in the oil inlet channel is too high, the hydraulic oil may flow to the two channels through the gap between the valve core and the valve body in the middle position, so that the driving mechanism connected to the channel through the pipeline, such as the hydraulic cylinder, will be activated, affecting normal use. Therefore, in order to avoid this situation, the valve core needs to be provided with an internal flow channel.

[0003] Patent "CN113958726B" discloses an internal flow reversing valve core structure, which includes an intermediate body and two sealing bodies threadedly connected to the two ends of the intermediate body. When the valve core is in use, the intermediate body and the two sealing bodies jointly participate in the flow direction control of the hydraulic oil. The sealing body and the intermediate body adopt a split design and are respectively processed with internal threads and external threads before assembly. Due to processing errors and installation errors, there are certain errors in the coaxiality and overall cylindricity of the sealing body and the intermediate body after assembly. After the seal and the intermediate body are welded, the whole needs to be reprocessed. Due to the processing errors of the reprocessing, the coaxiality of the reprocessed sealing body and the reprocessed intermediate body is further affected.

[0004] In addition, in actual production, the sealing body and the intermediate body need to be threadedly connected first, so that the limiting step set on the edge of the external threaded part of the intermediate body is connected to the docking step set on the outer side of the threaded interface of the sealing body, and then the limiting step and the docking step are welded to form a welding ring after full welding. Obviously, the welding position of this valve core is located on the outside, and the welding ring needs to be polished, which undoubtedly increases the processing amount of the overall periphery, and the aesthetics of the valve core is relatively poor. Utility Model Content

[0005] In order to solve the above technical problems and achieve at least one advantage of the utility model, the utility model provides an inner flow type reversing valve core mechanism, characterized in that the inner flow type reversing valve core mechanism comprises:

[0006] A main body, wherein the main body has two inner flow channels and two mounting holes, wherein the two mounting holes are respectively formed at two ends of the main body, and each mounting hole is axially connected to one of the inner flow channels, and the main body is formed with at least two openings in radial direction connected to each of the inner flow channels;

[0007] Two connecting members, each of the connecting members is inserted into one of the mounting holes to block one end of the corresponding internal flow passage close to the mounting hole;

[0008] Two groups of filler metal bodies, one filler metal body is arranged between each connecting member inserted into the mounting hole and the main body member. The main body member is brazed into one body with the two connecting members through the two groups of filler metal bodies. The filler metal body is implemented as filler metal that melts upon heating and then solidifies upon cooling.

[0009] According to an embodiment of the present invention, the internal flow type reversing valve spool mechanism further includes at least two missing structures. The inner wall of each mounting hole formed by the main body member and the outer wall of each connecting member are arbitrarily formed with the missing structures. The size of the connecting member is adapted to the size of the mounting hole. When the connecting member is integrally connected to the main body member through the filler metal body, the filler metal body is located within the missing structure. The filler metal body arranged in the missing structure and the connecting member jointly fill the mounting hole.

[0010] According to an embodiment of the present invention, a part of the outer wall of the connecting member is recessed to form the missing structure. When the connecting member is inserted into the mounting hole, the missing structure faces the inner wall of the mounting hole. The filler metal body arranged in the missing structure welds the outer wall of the connecting member forming the missing structure to the inner wall of the mounting hole.

[0011] According to an embodiment of the present invention, the radial length of the mounting hole is greater than the radial length of one end of the internal flow passage close to the mounting hole. The connecting member is assembled with the main body member in a manner that part of it is inserted into the mounting hole and abuts against the end wall of the mounting hole close to one end of the internal flow passage.

[0012] According to an embodiment of the present invention, the missing structure is implemented as an annular step formed on the connecting member that abuts against one end of the mounting hole close to the internal flow passage. When the connecting member is inserted into the mounting hole, the peripheral wall and the end wall of one end of the mounting hole close to the internal flow passage correspond to the annular step. The filler metal body arranged on the annular step welds the outer wall of the connecting member forming the annular step to the peripheral wall and the end wall of one end of the mounting hole close to the internal flow passage.

[0013] According to an embodiment of the present invention, the missing structure is implemented as an annular groove formed on the part of the connecting member that abuts against the end wall of the mounting hole on the side close to the internal flow passage. The filler metal body arranged in the annular groove welds the outer wall of the connecting member forming the annular groove to the end wall of the mounting hole on the side close to the internal flow passage.

[0014] According to one embodiment of the utility model, the outer periphery of the main body forms two first sealing bosses arranged at intervals and a second sealing boss arranged between the two first sealing bosses and spaced apart from the two first sealing bosses, and at least two openings connected to each of the internal flow channels are respectively formed on one of the first sealing bosses and the second sealing boss.

[0015] According to an embodiment of the utility model, each of the inner flow channel includes an axial flow channel, a group of first radial holes and a group of second radial holes, the first radial holes and the second radial holes are both connected to the axial flow channel, the axial flow channel is formed in the axial direction of the main body and each of the axial flow channel is connected to a mounting hole, the first radial holes and the second radial holes are both formed in the radial direction of the main body and are spaced a predetermined distance apart in the axial direction of the main body, and each of the first radial holes and each of the second radial holes are respectively connected to a through port, the through port connected to the first radial hole is formed on the second sealing boss, the through port connected to the second radial hole is formed on the first sealing boss, and the connecting member is inserted into the mounting hole to block an end of the corresponding axial flow channel toward the mounting hole.

[0016] According to an embodiment of the utility model, when the connecting member is inserted into the main member and the unheated solder is placed between the two, the first radial hole and the second radial hole are used to discharge hot air generated when the whole is heated.

[0017] In order to solve the above technical problems and achieve at least one advantage of the utility model, the utility model provides a reversing valve, the reversing valve comprising:

[0018] According to the inner flow type reversing valve core mechanism described in the above embodiment;

[0019] The spool mechanism of the inward flow reversing valve is movably arranged in the valve body to connect any one of the two channels with the oil inlet channel and the other with the oil return channel. When the spool mechanism of the inward flow reversing valve is not driven, the two first sealing bosses and the second sealing bosses abut against the inner wall of the valve body to isolate the two channels from the oil inlet channel and the oil return channel, and the second radial hole is connected with the oil return channel. The through port formed on the second sealing boss corresponds to the inner wall of the valve body. The hydraulic oil introduced into the oil inlet channel can be introduced into the through port formed on the second sealing boss through the gap between the second sealing boss and the inner wall of the valve body to enter the inner flow channel. The hydraulic oil in the inner flow channel flows to the oil return channel through the through port formed on the first sealing boss. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The structural schematic diagram of the inner-flow type reversing valve spool mechanism of the present utility model is shown.

[0021] Figure 2 The structural sectional view of the inner-flow type reversing valve spool mechanism of the present utility model is shown.

[0022] Figure 3 The structural sectional view of the inner-flow type reversing valve spool mechanism of the present utility model before heating is shown.

[0023] Figure 4 shows Figure 3 the partial structural explosion diagram of

[0024] Figure 5 The structural sectional view of the reversing valve of the present utility model is shown. Specific embodiments

[0025] The following description is used to disclose the present utility model so that those skilled in the art can implement the present utility model. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious variations. The basic principles defined in the following description of the present utility model can be applied to other implementation schemes, variant schemes, improvement schemes, equivalent schemes, and other technical schemes that do not deviate from the spirit and scope of the present utility model.

[0026] Those skilled in the art should understand that in the disclosure of the present utility model, the orientation or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on the present utility model.

[0027] It can be understood that the term "one" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in other embodiments, the number of the element can be multiple. The term "one" should not be construed as a limitation on the number.

[0028] Refer to Figures 1 to 4, the inner-flow type reversing valve spool mechanism according to a preferred embodiment of the present utility model will be elaborated in detail below. The inner-flow type reversing valve spool mechanism includes a main body member 10, and the main body member 10 forms two inner flow channels 101 and two mounting holes 102. The two mounting holes 102 are respectively formed at both ends of the main body member 10, and each mounting hole 102 is axially communicated with one of the inner flow channels 101. The main body member 10 forms at least two through ports 103 communicating with each inner flow channel 101 in the radial direction.

[0029] Reference Figures 2 to 3 , the inner-flow type reversing valve spool mechanism further includes two connecting members 20 and two groups of solder bodies 30. Each connecting member 20 is inserted into one of the mounting holes 102 to block one end of the corresponding inner flow channel 101 close to the mounting hole 102, and a solder body 30 is provided between each connecting member 20 inserted into the mounting hole 102 and the main body member 10. The main body member 10 is brazed with the two connecting members 20 into one body through the two groups of solder bodies 30. The solder body 30 is implemented as a solder that melts upon heating and then condenses and solidifies, such as a copper-based material.

[0030] Before brazing the inner-flow type reversing valve spool mechanism, the main body member 10 and the connecting member 20 are inserted. The inner flow channel 101 is formed in the main body member 10. Compared with the way of jointly forming the inner flow channel 101 and fixing it by threading, it avoids the problem that the coaxiality of the two is affected by the accumulation of thread tolerances, and avoids the problem that the coaxiality of the two after welding is affected by thread loosening. And compared with the way of first making threads and then forming the whole externally, the processing procedure is simplified, the coaxiality of the two is improved by reducing the tolerance accumulation amount, thereby improving the overall quality, and the overall strength is higher.

[0031] In addition, the main body member 10 is integrally processed, and its cylindricity, concentricity and dimensional accuracy can be guaranteed, and at the same time, it is also convenient for cleaning the internal and external burrs after processing.

[0032] It is worth mentioning that the welding position of the inner-flow type reversing valve spool mechanism is inside, which greatly reduces the workload of the overall peripheral grinding process, improves the aesthetics, and the inner-flow type reversing valve spool mechanism adopts a brazing process, which is simple to manufacture, has good firmness and high efficiency.

[0033] Preferably, the connecting member 20 is brazed to the main body member 10 through the solder body 30 by hard soldering.

[0034] Reference Figures 1 to 5, Further, two first sealing bosses 11 arranged at intervals are formed on the outer periphery of the main body 10, and a second sealing boss 12 is arranged between the two first sealing bosses 11 and spaced from the two first sealing bosses 11, and at least two of the through ports 103 communicated with each of the internal flow channels 101 are respectively formed on one of the first sealing bosses 11 and the second sealing boss 12.

[0035] Reference Figure 5 , It is worth mentioning that the internal flow type reversing valve spool mechanism and a valve body 50 are assembled to form a reversing valve. The valve body 50 has an oil inlet passage 501, two channels 502 and an oil return passage 503. The internal flow type reversing valve spool mechanism is movably arranged in the valve body 50 to communicate any one of the two channels 502 with the oil inlet passage 501 and the other with the oil return passage 503. When the internal flow type reversing valve spool mechanism is not driven, the two first sealing bosses 11 and the second sealing boss 12 are both in contact with the inner wall of the valve body 50 to cut off both of the two channels 502 from the oil inlet passage 501 and the oil return passage 503. The through port 103 formed on the first sealing boss 11 is communicated with the oil return passage 503, and the through port 103 formed on the second sealing boss 12 corresponds to the inner wall of the valve body 50. The hydraulic oil introduced into the oil inlet passage 501 can be introduced into the through port 103 formed on the second sealing boss 12 through the gap between the second sealing boss 12 and the inner wall of the valve body 50 to enter the internal flow channel 101. The hydraulic oil in the internal flow channel 101 flows to the oil return passage 503 through the through port 103 formed on the first sealing boss 11, so as to automatically relieve pressure when the hydraulic oil pressure is too high, effectively preventing the hydraulic oil from flowing to the two channels 502 of the valve body 50 and causing the driving mechanism communicated with the channels 502 through pipelines to move.

[0036] Reference Figures 2 to 5, preferably, each of the internal flow channels 101 includes an axial flow channel 1011, a set of first radial holes 1012, and a set of second radial holes 1013. Both the first radial holes 1012 and the second radial holes 1013 communicate with the axial flow channel 1011. The axial flow channel 1011 is formed axially in the main body 10, and each axial flow channel 1011 communicates with one of the mounting holes 102. The first radial holes 1012 and the second radial holes 1013 are both formed radially in the main body 10 and are spaced a predetermined distance axially in the main body 10. Each of the first radial holes 1012 and each of the second radial holes 1013 communicate with one of the through ports 103 respectively. The through port 103 communicating with the first radial hole 1012 is formed in the second sealing boss 12, and the through port 103 communicating with the second radial hole 1013 is formed in the first sealing boss 11. The first radial hole 1012 is used to introduce hydraulic oil into the axial flow channel 1011 when the oil pressure in the oil inlet channel 501 is too high, and the second radial hole 1013 is used to discharge the hydraulic oil in the axial flow channel 1011 into the oil return channel 503. The connecting member 20 is inserted into the mounting hole 102 to block one end of the corresponding axial flow channel 1011 facing the mounting hole 102.

[0037] When the internal flow type reversing valve spool mechanism is not driven, and both the first sealing boss 11 and the second sealing boss 12 are in contact with the inner wall of the valve body 50 to cut off both the channels 502 from the oil inlet channel 501 and the oil return channel 503, the second radial hole 1013 communicates with the oil return channel 503, and the first radial hole 1012 corresponds to the inner wall of the valve body 50. The hydraulic oil introduced into the oil inlet channel 501 can be introduced into the first radial hole 1012 through the gap between the second sealing boss 12 and the inner wall of the valve body 50 to enter the axial flow channel 1011. The hydraulic oil in the axial flow channel 1011 is discharged through the second radial hole 1013 and finally flows to the oil return channel 503 of the valve body 50 to automatically relieve pressure in the case of too high hydraulic oil pressure.

[0038] It is worth mentioning that when the connecting member 20 is inserted into the main body 10 and the unheated solder is placed between them, the main body 10 and the connecting member 20 are heated to melt the solder. At the same time, the hot gas generated by heating flows into the axial flow channel 1011 through the gap between the connecting member 20 and the main body 10 and is discharged through the first radial hole 1012 and the second radial hole 1013, so as to prevent the formed solder body 30 from having air holes, which may affect the sealing performance and firmness of the connection between the connecting member 20 and the main body 10.

[0039] ReferenceFigures 2 to 4 , preferably, two of each group of the first radial holes 1012 and two of each group of the second radial holes 1013 are provided. When the connecting member 20 and the main body member 10 are integrally heated to cause the solder located therebetween to be heated and melted, the hot air generated by heating can be quickly discharged, and it is also convenient to quickly relieve pressure during use.

[0040] Preferably, the two first radial holes 1012 in each group and the two second radial holes 1013 in each group are symmetrically distributed with respect to the axis of the axial flow channel 1011, which is conducive to the rapid flow of the hot air generated by heating and is also conducive to quickly relieving pressure during use.

[0041] Preferably, the diameter length of the mounting hole 102 is greater than the diameter length of the inner flow channel 101 near one end of the mounting hole 102. The connecting member 20 is assembled with the main body member 10 in such a way that a part of the connecting member 20 is inserted into the mounting hole 102 and abuts against the end wall of the mounting hole 102 near one end of the inner flow channel 101, so as to define the insertion depth of the connecting member 20 by the end wall of the mounting hole 102 near one end of the inner flow channel 101 for easy assembly.

[0042] Reference Figures 2 to 4 , further, the inner-flow type reversing valve spool mechanism further includes at least two missing structures 40, and the inner wall of each mounting hole 102 formed by the main body member 10 and the outer wall of each connecting member 20 are arbitrarily formed with the missing structures 40. The size of the connecting member 20 is adapted to the size of the mounting hole 102. When the connecting member 20 is integrally connected to the main body member 10 through the solder body 30, the solder body 30 is located in the missing structure 40, and the solder body 30 and the connecting member 20 provided in the missing structure 40 jointly fill the mounting hole 102. In this way, the missing structure 40 provides an assembly space for the solder body 30, so that the connecting member 20 and the main body member 10 are closely and firmly fitted.

[0043] Preferably, a part of the outer wall of the connecting member 20 is recessed to form the missing structure 40. When the connecting member 20 is inserted into the mounting hole 102, the missing structure 40 faces the inner wall of the mounting hole 102. The solder body 30 provided in the missing structure 40 welds the outer wall of the connecting member 20 forming the missing structure 40 to the inner wall of the mounting hole 102 to connect the connecting member 20 and the main body member 10 into one body.

[0044] Preferably, the missing structure 40 is implemented as an annular step formed on the connecting member 20 at the end of the mounting hole 102 close to the inner flow channel 101. When the connecting member 20 is inserted into the mounting hole 102, the peripheral wall and the end wall of the mounting hole 102 at the end close to the inner flow channel 101 correspond to the annular step. The solder body 30 disposed on the annular step welds the outer wall of the connecting member 20 forming the annular step to the peripheral wall and the end wall of the mounting hole 102 at the end close to the inner flow channel 101, so as to integrally connect the connecting member 20 and the main body member 10. In this way, the connecting member 20 and the main body member 10 are welded and connected both axially and radially, so as to increase the firmness of the overall connection.

[0045] It is worth mentioning that when the missing structure 40 is implemented as an annular step formed on the connecting member 20 at the end of the mounting hole 102 close to the inner flow channel 101, the unheated solder is sleeved on the annular step in an annular shape, increasing the convenience of solder installation.

[0046] Alternatively, the missing structure 40 is implemented as an annular groove formed in the portion of the connecting member 20 in contact with the end wall of the mounting hole 102 on the side close to the inner flow channel 101. The solder body 30 disposed in the annular groove welds the outer wall of the connecting member 20 forming the annular groove to the end wall of the mounting hole 102 on the side close to the inner flow channel 101, so as to integrally connect the connecting member 20 and the main body member 10.

[0047] Alternatively, the missing structure 40 is implemented as an annular groove formed in the peripheral wall of the connecting member 20. When the connecting member 20 is inserted into the mounting hole 102, the peripheral wall of the mounting hole 102 corresponds to the annular groove. The solder body 30 disposed in the annular groove welds the inner wall of the connecting member 20 forming the annular groove to the peripheral wall of the mounting hole 102, so as to integrally connect the connecting member 20 and the main body member 10.

[0048] In another embodiment, a part of the inner wall of the mounting hole 102 is recessed to form the missing structure 40. When the connecting member 20 is inserted into the mounting hole 102, the missing structure 40 faces the outer wall of the connecting member 20. The solder body 30 disposed in the missing structure 40 welds the inner wall of the mounting hole 102 forming the missing structure 40 to the outer wall of the connecting member 20, so as to integrally connect the connecting member 20 and the main body member 10.

[0049] Those skilled in the art can understand that the missing structure 40 can be implemented as an annular groove formed on the peripheral wall of the mounting hole 102 or an annular groove on one end wall of the mounting hole 102 close to the inner flow passage 101. Similarly, the purpose of accommodating the solder body 30 and connecting the connecting member 20 and the main body member 10 into one body by using the solder body 30 placed in the missing structure 40 can be achieved, and details are not described herein again.

[0050] Reference Figures 2 to 4 , further, the connecting member 20 includes a connecting body 21 and a deep insertion portion 22, and the deep insertion portion 22 is formed by axially extending from the end of the connecting body 21. The radial length of the deep insertion portion 22 is smaller than the radial length of the connecting body 21, and the size of the deep insertion portion 22 is adapted to the size of the axial flow passage 1011. The connecting member 20 is assembled with the main body member 10 in such a way that the connecting body 21 is inserted into the mounting hole 102 and the deep insertion portion 22 is inserted into the axial flow passage 1011, so as to further improve the connection tightness between the connecting member 20 and the main body member 10. When the connecting member 20 is assembled with the main body member 10, the deep insertion portion 22 is located on the side of the second radial hole 1013 on the same side away from the first radial hole 1012 on the same side, so as to prevent the length of the deep insertion portion 22 from being too long, so that the deep insertion portion 22 inserted into the axial flow passage 1011 blocks the second radial hole 1013 and affects the normal use of the inner flow type reversing valve spool mechanism.

[0051] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the drawings are only examples and do not limit the present invention. The advantages of the present invention have been fully and effectively realized. The functions and structural principles of the present invention have been shown and described in the embodiments. Without departing from the above principles, the embodiments of the present invention can have any deformation or modification.

Claims

1. The inner-flow type reversing valve spool mechanism is characterized in that, The inner-flow type reversing valve spool mechanism includes: A main body member having two inner flow channels and two mounting holes. The two mounting holes are respectively formed at two end portions of the main body member, and each mounting hole is axially communicated with one of the inner flow channels. The main body member is formed with at least two ports communicated with each inner flow channel in the radial direction; Two connecting members, each of which is inserted into one of the mounting holes to block one end portion of the corresponding inner flow channel close to the mounting hole; Two groups of solder bodies, with one solder body disposed between each connecting member inserted into the mounting hole and the main body member. The main body member is brazed with the two connecting members into an integral body through the two groups of solder bodies. The solder body is implemented as a solder that is melted by heating and then solidified by condensation.

2. The inner-flow type reversing valve spool mechanism according to claim 1, characterized in that The inner-flow type reversing valve spool mechanism further includes at least two missing structures. The inner wall of each mounting hole formed on the main body member and the outer wall of each connecting member are arbitrarily formed with the missing structures. The size of the connecting member is adapted to the size of the mounting hole. When the connecting member is integrally connected with the main body member through the solder body, the solder body is located within the missing structure, and the solder body and the connecting member disposed in the missing structure jointly fill the mounting hole.

3. The inner-flow type reversing valve spool mechanism according to claim 2, wherein A part of the outer wall of the connecting member is recessed to form the missing structure. When the connecting member is inserted into the mounting hole, the missing structure faces the inner wall of the mounting hole, and the solder body disposed in the missing structure welds the outer wall of the connecting member forming the missing structure to the inner wall of the mounting hole.

4. The inner-flow type reversing valve spool mechanism according to claim 3, characterized in that, The radial length of the mounting hole is greater than the radial length of one end portion of the inner flow channel close to the mounting hole. The connecting member is assembled with the main body member in a manner that a part of it is inserted into the mounting hole and abuts against the end wall of the mounting hole close to the inner flow channel.

5. The inner-flow type reversing valve spool mechanism according to claim 4, characterized in that, The missing structure is implemented as an annular step formed on the connecting member that abuts against one end portion of the mounting hole close to the inner flow channel. When the connecting member is inserted into the mounting hole, the peripheral wall and the end wall of the mounting hole close to the inner flow channel both correspond to the annular step, and the solder body disposed on the annular step welds the outer wall of the connecting member forming the annular step to the peripheral wall and the end wall of the mounting hole close to the inner flow channel.

6. The inner-flow type reversing valve spool mechanism according to claim 4, characterized in that, The missing structure is implemented as an annular groove formed on a part of the connecting member that abuts against the end wall of the mounting hole on the side close to the inner flow channel. The solder body disposed in the annular groove welds the outer wall of the connecting member forming the annular groove to the end wall of the mounting hole on the side close to the inner flow channel.

7. The inner-flow type reversing valve spool mechanism according to claim 1, wherein, Two first sealing bosses are formed at intervals on the outer periphery of the main body member, and a second sealing boss is disposed between the two first sealing bosses and is spaced from the two first sealing bosses. At least two ports communicated with each inner flow channel are respectively formed on one of the first sealing bosses and the second sealing boss.

8. The inner flow type reversing valve spool mechanism according to claim 7, characterized in that, Each of the inner flow channels includes an axial flow channel, a group of first radial holes and a group of second radial holes, the first radial holes and the second radial holes are both connected to the axial flow channel, the axial flow channel is formed in the axial direction of the main body and each of the axial flow channel is connected to a mounting hole, the first radial holes and the second radial holes are both formed in the radial direction of the main body and are spaced a predetermined distance apart in the axial direction of the main body, and each of the first radial holes and each of the second radial holes are respectively connected to a through port, the through port connected to the first radial hole is formed on the second sealing boss, the through port connected to the second radial hole is formed on the first sealing boss, and the connecting member is inserted into the mounting hole to block an end of the corresponding axial flow channel toward the mounting hole.

9. The inner-flow type reversing valve spool mechanism according to claim 8, characterized in that, When the connecting member is inserted into the main member and the unheated solder is placed between the two, the first radial hole and the second radial hole are used to discharge hot air generated when the whole is heated.

10. A reversing valve, characterized in that, The reversing valve comprises: The valve core mechanism of the internal flow type reversing valve according to any one of claims 7 to 9; The spool mechanism of the inward flow reversing valve is movably arranged in the valve body to connect any one of the two channels with the oil inlet channel and the other with the oil return channel. When the spool mechanism of the inward flow reversing valve is not driven, the two first sealing bosses and the second sealing bosses abut against the inner wall of the valve body to isolate the two channels from the oil inlet channel and the oil return channel, and the second radial hole is connected with the oil return channel. The through port formed on the second sealing boss corresponds to the inner wall of the valve body. The hydraulic oil introduced into the oil inlet channel can be introduced into the through port formed on the second sealing boss through the gap between the second sealing boss and the inner wall of the valve body to enter the inner flow channel. The hydraulic oil in the inner flow channel flows to the oil return channel through the through port formed on the first sealing boss.

Images