Reversing valve
By designing the first valve body part and the second valve body part of the reversing valve as an integrated structure and using stamping and forming processing, the problem of low processing efficiency in the prior art is solved, and more efficient reversing valve processing and better reversing performance are achieved.
Patent Information
- Application Number
- CN202422325433.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-24
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-09-24
AI Technical Summary
The processing efficiency of the reversing valves in the existing refrigeration system is inefficient, especially since the welding of the first and second end caps requires batch operation, resulting in low processing efficiency.
The design of the first valve body part and the second valve body part as an integrated structure is adopted, and the welding workload is reduced through stamping and molding, and only the secondary valve body needs to be pressed and welded during assembly, simplifying the processing process.
It improves the processing efficiency of the reversing valve, ensures coaxiality and reversing performance, avoids piston burns, and improves the reversing efficiency and reliability of the reversing valve.
Smart Images
Figure CN223090053U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of refrigerant switching valves for refrigeration systems, and more particularly to a reversing valve. Background Art
[0002] In a refrigeration system, a reversing valve is used to switch between a refrigeration mode and a heating mode. Figure 1 As a schematic cross-sectional view of a reversing valve in the background art, as Figure 1 shown, the reversing valve includes a valve body, an end cover 6, a valve seat 5, and a spool component. The end cover 6 is welded to the axial end of the valve body. The end cover 6 has a first end cover and a second end cover, which are oppositely arranged. The valve seat 5 is located in the inner cavity of the valve body. The spool component includes a spool 2, a guide frame 3, and a piston element 4. The slider 2 abuts against the upper end surface of the valve seat 5. The piston rod 3 is connected to the slider 2. The end of the piston rod 3 facing away from the slider 2 is connected to the piston element 4. The end cover 6 has a limiting portion that can abut against the piston element 4. The above-mentioned first end cover and second end cover not only require an additional process to machine the limiting portion, but also need to be operated in batches when welding the first end cover and the second end cover to the valve body, resulting in low processing efficiency. Therefore, how to improve the processing efficiency of the reversing valve is a problem that those skilled in the art need to pay attention to. Summary of the Utility Model
[0003] A reversing valve provided by the utility model includes a valve body component and a spool component. The valve body component includes a main valve body and a sub-valve body. The main valve body includes a first valve body portion and a second valve body portion. The first valve body portion and the second valve body portion are an integral structure. The sub-valve body portion is welded to the first valve body portion. The second valve body portion includes a first piston displacement section and a first piston limiting portion. In the longitudinal direction of the reversing valve, the cross-sectional area of the first piston displacement section is smaller than that of the first valve body portion. The first piston displacement section is closer to the first valve body portion than the first piston limiting portion. The valve body component has a valve cavity. The spool component is located in the valve cavity. The spool component includes a first piston, which is slidably matched with the first piston displacement section and can abut against the first piston limiting portion. The spool component further includes a second piston. The sub-valve body includes a second piston displacement section and a second piston limiting portion. The second piston is slidably matched with the second piston displacement section and can abut against the second piston limiting portion.
[0004] For the reversing valve provided in this application, the first valve body portion and the second valve body portion are an integral structure. The first piston limiting portion can be directly formed during the machining of the main valve body without secondary machining. When machining the valve body component, it only needs to weld the sub-valve body portion to the first valve body portion, reducing the overall welding workload of the valve body component and improving the processing efficiency of the reversing valve. Description of the Drawings
[0005] Figure 1 : Schematic cross-sectional view of a reversing valve in the background art;
[0006] Figure 2 : Three-dimensional schematic view of the reversing valve provided by the present utility model;
[0007] Figure 3 : Figure 2 Cross-sectional schematic view of the reversing valve in
[0008] Figure 4 : Figure 3 Schematic view of location A in
[0009] Figure 5 : Figure 4 Cross-sectional schematic view of the C-C section in
[0010] Figure 6 : Figure 2 Three-dimensional schematic view of the valve body in
[0011] Figure 7 : Figure 6 Three-dimensional schematic view of the second valve body part in
[0012] Figure 8 : Figure 3 Schematic view of location B in
[0013] Figure 9 : Figure 3 Three-dimensional schematic view of the spool component and the end cover as inserts in
[0014] Figure 2-9 Reference numerals in
[0015] 1 - valve body, 11 - first valve body part, 111 - cavity, 12 - second valve body part, 121 - first piston displacement section, 123 - first side hole, 1231 - first cylindrical section, 124 - first cover part, 1241 - first arc part, 1242 - middle part, 1243 - second arc part, 1244 - end head part, 125 - first limit step, 1251 - first step surface, 126 - first transition part,
[0016] 2 - spool component, 21 - spool, 22 - guide frame, 23 - first piston, 231 - end plate, 2311 - first end face, 232 - piston bowl, 233 - first fixing member, 233a - first rivet, 233b - second rivet, 2331 - first head, 234 - second fixing member, 234a - first screw, 234b - second screw, 2341 - second head, 24 - second piston,
[0017] 3 - Sub - valve body, 31 - Second piston displacement section, 32 - Second cover part, 321 - Second side hole, 3211 - Second cylindrical section, 33 - Connection part, 331 - Outer ring surface, 34 - Second limiting step, 35 - Second transition part,
[0018] 4 - Capillary tube, 41 - First capillary tube, 42 - Second capillary tube,
[0019] 5 - Pilot valve. Specific embodiments
[0020] In order to enable those skilled in the art to better understand the technical solutions of the present utility model, the present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. The upper, lower and other orientation terms involved herein are defined according to the positions of the components shown in the Figure 3 accompanying drawings, only for the sake of clarity and convenience in expressing the technical solutions. It should be understood that the orientation terms adopted herein should not limit the scope of protection requested by this application.
[0021] Figure 2 Is a three - dimensional schematic diagram of the reversing valve provided by the present utility model; Figure 3 Is Figure 2 a sectional schematic diagram of the reversing valve in Figure 4 Is Figure 3 a schematic diagram at position A in Figure 5 Is Figure 4 a sectional schematic diagram at C - C in Figure 6 Is Figure 2 a three - dimensional schematic diagram of the valve body in Figure 7 Is Figure 6 a three - dimensional schematic diagram of the second valve body part in Figure 8 Is Figure 3 a schematic diagram at position B in Figure 9 Is Figure 3 a three - dimensional schematic diagram of the spool component and the end cover as inserts in
[0022] In this embodiment, it is defined that the axial direction of the main valve body 1 / the axial direction of the first piston displacement section 121 / the axial direction of the second piston displacement section 31 as shown in Figure 3 is the transverse direction of the reversing valve, and the direction perpendicular to the axial direction of the main valve body 1 is the longitudinal direction of the reversing valve.
[0023] As shown in the figure, the direction-changing valve of this embodiment is described by taking a stainless-steel four-way direction-changing valve as an example. The direction-changing valve is installed in the refrigeration system, and the direction-changing of the direction-changing valve is achieved through differential pressure force. The direction-changing valve includes a valve body component, a pilot valve 5, and a spool component 2. The valve body component has a cavity 111, and the spool component 2 is located in the cavity 111. The valve body component includes a main valve body 1 and a sub-valve body 3. The main valve body 1 and the sub-valve body 3 are made of stainless steel. The main valve body 1 includes a first valve body part 11 and a second valve body part 12. The sub-valve body 3 is arranged opposite to the second valve body part 12 in the lateral direction of the direction-changing valve. The valve body component further includes a valve seat, and the valve seat is fixed to the inner wall of the first valve body part 11.
[0024] Among them, the spool component 2 includes a spool 21, a guide frame 22, a first piston 23, and a second piston 24. At least part of the spool 21 is located in the inner cavity of the first valve body part 11. The spool 21 is connected to the middle of the guide frame 22. The spool 21 can slide relative to the valve seat. In the lateral direction of the direction-changing valve, the guide frame 22 includes a first connection end and a second connection end. The first connection end is connected to the first piston 23, and the second connection end is connected to the second piston 24.
[0025] Among them, the pilot valve 5 is installed outside the first valve body part 11. The direction-changing valve further includes a capillary tube 4. The capillary tube 4 is connected between the valve body component and the pilot valve 5. The capillary tube 4 includes a first capillary tube 41 and a second capillary tube 42. Part of the first capillary tube 41 is connected to the second valve body part 12, and part of the second capillary tube 42 is connected to the sub-valve body 3. When the pilot valve 5 controls the operation of the direction-changing valve, the medium in the pilot valve 5 can push the guide frame 22 through the piston to drive the spool 21 to move, realizing the switching of the pipeline.
[0026] In this embodiment, the first valve body part 11 and the second valve body part 12 are of an integral structure. Part of the sub-valve body 3 is located in the inner cavity of the first valve body part 11, and part of the sub-valve body 3 is welded to the first valve body part 11. The second valve body part 12 includes a first piston displacement section 121 and a first piston limiting part. The first piston displacement section 121 is closer to the first valve body part 11 than the first piston limiting part. The first piston 23 is in sliding fit with the first piston displacement section 121, and the first piston 23 can abut against the first piston limiting part. In the longitudinal direction of the direction-changing valve, the cross-sectional area of the first piston displacement section 121 is smaller than that of the first valve body part 11; the sub-valve body 3 includes a second piston displacement section 31 and a second piston limiting part. The second piston 24 is in sliding fit with the second piston displacement section 31, and the second piston 24 can abut against the second piston limiting part. Based on this, the overall welding workload of the valve body component can be reduced, and the processing efficiency of the direction-changing valve can be improved.
[0027] In this embodiment, the main valve body 1 is a stamping part. The main valve body 1 is processed by stamping to form an integral structure of the first valve body part 11 and the second valve body part 12. Of course, the above processing method is not limited to stamping. When the first valve body part 11 and the second valve body part 12 can be integrally processed and formed, other processing methods can also be used for processing. For example, the main valve body 1 is formed by stretching as a stretched part, or by roll forming, casting, etc.
[0028] It can be understood that when the inner diameter of the first piston displacement section 121 is different from that of the first valve body part 11, although the main valve body 1 can be provided with assembled end caps at both transverse ends of the first valve body part 11 (such as the auxiliary valve body 3 mentioned in this embodiment), the inventor found that when end caps are press-fitted at both ends of the first valve body part 11, when the end caps are welded to the first valve body part 11 (the auxiliary valve body 3 and the inner wall of the first valve body part 11 are fixed by laser welding in this embodiment), since welding needs to be carried out twice, the position where the piston stays needs to be ensured at the middle position of the piston displacement section, and then welding is carried out. Or the piston on one side first abuts against the corresponding piston limiting part to weld the end cap on this side to the first valve body part 11. After welding is completed, air blowing and commutation are required, and then the end cap on the other side is welded. Not only is the welding process complex, but also if the piston is close to the weld position during welding, there is a risk of burning the piston, which will also affect the commutation efficiency of the commutation valve accordingly. At the same time, when end caps are press-fitted at both ends of the first valve body part 11, it is difficult to ensure the coaxiality between the first valve body part 11 and the end caps on both sides, and a large out-of-roundness will also affect the commutation performance of the product.
[0029] Based on the above content, the first valve body part 11 and the second valve body part 12 are of an integral structure. When assembling the valve body components of the commutation valve, only the auxiliary valve body 3 needs to be press-fitted and welded. On the one hand, the assembly efficiency of the valve body components can be improved. On the other hand, for the main valve body 1 formed by the above processing method, not only the coaxiality between the main valve body 1 and the auxiliary valve body 3 can be effectively guaranteed, and the influence on the commutation performance of the commutation valve is smaller, but also when assembling the auxiliary valve body 3 and the spool component 2, the auxiliary valve body 3 and the spool component 2 can be pre-assembled as shown in Figure 9 and then press-fitted, so as to ensure that the second piston 24 will not be burned during laser welding and ensure the commutation efficiency of the commutation valve.
[0030] In this embodiment, the first valve body part 11 is cylindrical, and the first piston displacement section 121 is cylindrical. Define the inner diameter of the first valve body part 11 as D1 and the inner diameter of the first piston displacement section 121 as D2, then the ratio of D1 to D2 satisfies 1.5 - 2.5. It should be noted that when the first piston 23 slides, on the premise that the commutation valve can provide sufficient thrust for the first piston 23, the smaller the dimensions of the first piston displacement section 121 and the first piston 23, the higher the commutation efficiency.
[0031] In this embodiment, laterally of the directional control valve, it is defined that the length of the first valve body portion 11 is H1 and the length of the second valve body portion 12 is H2, and the ratio of H1 to H2 satisfies 1 - 1.8. It should be noted that on the premise of ensuring the stroke during the sliding of the first piston 23, not only can the cost and volume of the main valve body 1 be reduced, but also when the first valve body portion 11 and the second valve body portion 12 are integrally formed and processed, the situation that the second valve body portion 12 is too long and inconvenient for processing can be avoided.
[0032] In this embodiment, the second valve body portion 12 further includes a first transition portion 126. One end of the first transition portion 126 is connected to the first piston displacement section 121, and the other end of the first transition portion 126 is connected to the first valve body portion 11. It is defined that the included angle between the first transition portion 126 and the first piston displacement section 121 is x, and the included angle x satisfies 90° - 110°. Among them, the included angle x can be 100°. Through the inclined setting of the first transition portion 126, the strength of the main valve body 1 at this position can be further improved, the main valve body 1 can be prevented from cracking, and stress concentration can be avoided.
[0033] It should be noted that when the fluid medium entering the inner cavity of the first cover body portion 124 is under constant pressure, compared with the directional control valve in the background art, in the directional control valve of this embodiment, because the internal dimension of the first piston displacement section 121 matches the dimension of the first piston 23, when the internal dimension of the first piston displacement section 121 is smaller than the internal dimension of the first valve body portion 11, the contact area between the first piston 23 and the first piston displacement section 121 is reduced, and the friction between the first piston 23 and the first piston displacement section 121 is reduced, so that the sliding speed of the first piston 23 can be increased, and the commutation efficiency of the directional control valve can be improved.
[0034] In this embodiment, the first piston displacement section 121 is cylindrical. The second valve body portion 12 further includes a first cover body portion 124. Longitudinally of the directional control valve, the cross-sectional area of the inner contour of the first piston displacement section 121 is larger than the cross-sectional area of the inner contour of the first cover body portion 124. A first limiting step 125 is included between the first piston displacement section 121 and the first cover body portion 124, and the first limiting step 125 serves as a first piston limiting portion. It can be understood that by further reducing the internal dimension of the first cover body portion 124 in this directional control valve, a difference is made between the internal dimension of the first piston displacement section 121 and the internal dimension of the first cover body portion 124, so as to correspondingly reduce the initial driving force required for the displacement of the first piston 23, improve the sliding speed of the first piston 23, and improve the commutation efficiency of the directional control valve.
[0035] In this embodiment, the first piston 23 includes an end plate 231 and a piston bowl 232. The end plate 231 has a first end face 2311 facing the first cover body portion 124 side, and the first limiting step 125 has a first step face 1251 facing the first valve body portion 11 side. It can be understood that along the axial projection direction of the first piston displacement section 121, the inner contour of the projection surface of the first cover body portion 124 is located within the outer contour of the projection surface of the first end face 2311. When the end plate 231 of the first piston 23 abuts against the first step face 1251, when the pressure remains unchanged, the pressure of the fluid borne by the corresponding first cover body portion 124 will be greater, making the thrust when pushing the first piston 23 to slide greater. Thus, the response rate of the first piston 23 when the directional control valve changes direction can be improved.
[0036] It should be noted that although the smaller the internal dimension of the first cover body portion 124, the faster the reversing speed of the first piston 23, overly reducing the inner contour dimension of the first cover body portion 124 will cause interference between the first piston 23 and the first cover body portion 124, affecting the reversing in-place situation when the directional control valve changes direction. Among them, the spool component 2 further includes a fixing member, and the fixing member includes a first fixing member 233 and a second fixing member 234. The first fixing member 233 connects the end plate 231 and the piston bowl 232. The first fixing member 233 has a first rivet 233a and a second rivet 233b. In the Figure 5 perspective, the first rivet 233a and the second rivet 233b are arranged diagonally. The first fixing member 233 includes a first head 2331. The first head 2331 protrudes from the first end face 2311 toward the first cover body portion 124 side. The first head 2331 has a first base portion and a second base portion. The first base portion serves as the rivet head of the first rivet 233a, and the second base portion serves as the rivet head of the second rivet 233b. The second fixing member 234 connects the first piston 23 and the guide frame 22. The second fixing member 234 has a first screw 234a and a second screw 234b. In the Figure 5From this perspective, the first screw 234a and the second screw 234b are diagonally arranged. The second fixing member 234 includes a second head 2341, and the second head 2341 protrudes from the first end face 2311 towards the side close to the first cover part 124. The second head 2341 has a third base part and a fourth base part. The third base part serves as the screw head of the first screw 234a, and the fourth base part serves as the screw head of the second screw 234b. In the longitudinal direction of the reversing valve, the inner contour of the cross-section of the first cover part 124 is non-circular. The non-circular inner contour of the first cover part 12 can reduce the internal size of the first cover part 12 while enabling the first cover part 12 to retain an interval space from the first head 2331 and the second head 2341 in the longitudinal direction of the reversing valve. When the first end face 2311 abuts against the first step surface 1251, the outer surface of the first head 2331 does not contact the inner wall of the first cover part 124, and the outer surface of the second head 2341 does not contact the inner wall of the first cover part 124, so as to avoid interference between the first head 2331 and the second head 2341 and the first cover part 124, and further ensure that the reversing valve can be reversed in place when reversing.
[0037] It should be noted that the smaller the internal size of the first cover part 12 is, the greater the pressure that the first cover part 12 needs to bear. Although the thicker the wall thickness of the first cover part 12, the better the anti-pressure effect, the corresponding material consumption will also increase accordingly. The non-circular inner contour of the first cover part 12 can reduce the consumption of materials while increasing the contact surface between the inner wall of the first cover part 12 and the fluid medium. Therefore, the first cover part 12 can bear a greater fluid pressure and avoid deformation of the first cover part 12.
[0038] Among them, to avoid interference between the first cover part 124 and the first piston 23 caused by the minimum inner wall spacing of the first cover part 12 in the radial direction of the first piston displacement section 121 being greater than the maximum outer surface spacing of the heads of the fixing members in the diagonal direction when the internal size of the first cover part 124 is reduced. In this embodiment, the first cover part 124 includes a first arc part 1241 and a second arc part 1243. The first arc part 1241 and the second arc part 1243 extend from the first step surface 1251 towards the side away from the first valve body part 11. In the transverse direction of the reversing valve, the length of the first arc part 1241 is greater than the length of the first head 2331, and the length of the second arc part 1243 is greater than the length of the second head 2341. When the first end face 2311 abuts against the first step surface 1251, the first arc part 1241 corresponds to the first head 2331 in the longitudinal direction of the reversing valve, and the second arc part 1243 corresponds to the second head 2341 in the longitudinal direction of the reversing valve. It can be understood that Figure 5As shown, the number of the first arc portions 1241 corresponds to the number of the rivets, and they are oppositely arranged in the same diagonal direction as the rivets. Similarly, the number of the second arc portions 1243 corresponds to the number of the screws, and they are oppositely arranged in the same diagonal direction as the screws to avoid interference problems.
[0039] In the perspective view as Figure 5 shown, the inner contour cross-section of the first arc portion 1241 and the second arc portion 1243 in the longitudinal direction of the reversing valve is an arc structure, and this arc structure can be adapted to the heads of the screws and the rivets.
[0040] Wherein, the first cover body portion 124 further includes an intermediate portion 1242. The intermediate portion 1242 extends from the first step surface 1251 towards the side away from the first valve body portion 11. In the circumferential direction of the first piston displacement section 121, the first arc portion 1241 and the second arc portion 1243 are connected by the intermediate portion 1242. It is defined that the minimum distance between the inner wall of the intermediate portion 1242 and the inner wall of the first piston displacement section 121 is the first interval, the minimum distance between the inner wall of the first arc portion 1241 and the inner wall of the first piston displacement section 121 is the second interval, then the first interval is greater than the second interval. The minimum distance between the inner wall of the second arc portion 1243 and the inner wall of the first piston displacement section 121 is the third interval, then the first interval is greater than the third interval. Thus, during commutation, the first step surface 1251 has a sufficient contact surface to abut against the first end surface 2311. Based on the above content, this contact surface is more concentrated in the area between the inner wall of the intermediate portion 1242 and the inner wall of the first piston displacement section 121, which can reduce or avoid the interference between the first piston 23 and the first cover body portion 124.
[0041] The intermediate portion 1242 can be an arc structure in the perspective view as Figure 6 shown. This arc structure can protrude towards the inner cavity of the first cover body portion 124, or can protrude away from the inner cavity of the first cover body portion 124. Of course, the intermediate portion 1242 can also be other shaped structures, such as a planar structure, and the above purpose can also be achieved. However, it should be noted that when the intermediate portion 1242 adopts an arc structure, compared with when the intermediate portion 1242 adopts a planar structure, the strength of the first cover body portion 124 can be further improved to ensure the stability of the second valve body portion 12.
[0042] In this embodiment, the first cover body portion 124 further includes an end head portion 1244. The end head portion 1244 is connected to the end of the first cover body portion 124 away from the first valve body portion 11, and the center of the end head portion 1244 protrudes towards the inner cavity of the first cover body portion 124. The end head portion 1244 is in Figure 4The cross-section viewed from this perspective is arc-shaped. By means of the end head 1244, the contact area between the first cover body part 124 and the fluid can be increased. During the commutation process, the situation of the expansion of the end head 1244 caused by the change in fluid pressure can be reduced or avoided, ensuring the overall stability of the first cover body part 124.
[0043] In this embodiment, the second piston displacement section 31 is cylindrical. The secondary valve body 3 further includes a second cover body part 32. The second cover body part 32 is connected to the end of the second piston displacement section 31 away from the first valve body part 11. In the longitudinal direction of the commutation valve, the inner contour of the cross-section of the second cover body part 32 is non-circular, and the cross-sectional area of the inner contour of the second piston displacement section 31 is larger than the cross-sectional area of the inner contour of the second cover body part 32. A second limiting step 34 is included between the second piston displacement section 31 and the second cover body part 32. The second limiting step 34 serves as the second piston limiting part. The similarities in the structures of the secondary valve body 3 and the second valve body part 12 have the same functions and effects, and will not be elaborated here.
[0044] Among them, in the longitudinal direction of the commutation valve, the cross-sectional area of the inner contour of the second piston displacement section 31 is smaller than the cross-sectional area of the inner contour of the first valve body part 11. The secondary valve body 3 further includes a connecting part 33. The connecting part 33 is cylindrical. The connecting part 33 is closer to the second valve body part 12 relative to the second piston displacement section 31. A second transition part 35 is included between the connecting part 33 and the second piston displacement section 31. Part of the connecting part 33 is located in the inner cavity of the first valve body part 11. The outer ring surface 331 of the connecting part 33 is welded and fixed to the inner wall of the first valve body part 11. The connecting part 33 extends along the axial direction of the first valve body part 11 from the second transition part 35, so that the connecting part 33 has a relatively long straight section. Therefore, the coaxiality between the secondary valve body 3 and the first valve body part 11 is better, and the left-right commutation function of the commutation valve can be realized better.
[0045] Among them, the included angle between the second transition part 35 and the second piston displacement section 31 is 90° - 110°. This included angle can be 100°. Through the second transition part 35, the strength of the secondary valve body 3 at this position can be further ensured.
[0046] In this embodiment, the reversing valve further includes a capillary 4 and a pilot valve 5. A capillary 4 is connected between the valve body component and the pilot valve 5. The capillary 4 includes a first capillary 41 and a second capillary 42. The first cover portion 124 includes a first side hole 123. The first side hole 123 has a first cylindrical section 1231. In the axial direction of the first side hole 123, the first cylindrical section 1231 protrudes toward the inner cavity of the first cover portion 124. A part of the first capillary 41 is connected to the first cylindrical section 1231. The first cylindrical section 1231 increases the contact area between the second valve body portion 12 and the first capillary 41 and improves the connection strength. The second cover portion 32 includes a second side hole 321. The second side hole 321 has a second cylindrical section 3211. In the axial direction of the second side hole 321, the second cylindrical section 3211 protrudes toward the inner cavity of the second cover portion 32. A part of the second capillary 42 is connected to the second cylindrical section 3211. The second cylindrical section 3211 increases the contact area between the auxiliary valve body 3 and the second capillary 42 and improves the connection strength.
[0047] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered as the scope described in this specification.
[0048] The above-described embodiments only represent several implementation manners of the present utility model. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and controls can still be made, and these all belong to the protection scope of the present utility model.
Claims
1. A reversing valve, characterized in that, It includes a valve body component and a spool component (2). The valve body component includes a main valve body (1) and a sub-valve body (3). The main valve body (1) includes a first valve body part (11) and a second valve body part (12). The first valve body part (11) and the second valve body part (12) are of an integral structure. The sub-valve body (3) is partially welded to the first valve body part (11). The second valve body part (12) includes a first piston displacement section (121) and a first piston limiting part. In the longitudinal direction of the directional valve, the cross-sectional area of the first piston displacement section (121) is smaller than that of the first valve body part (11). The first piston displacement section (121) is closer to the first valve body part (11) than the first piston limiting part. The valve body component has a valve cavity (111), and the spool component (2) is located in the valve cavity (111). The spool component (2) includes a first piston (23), and the first piston (23) is slidably engaged with the first piston displacement section (121). The first piston (23) can abut against the first piston limiting part; The spool component (2) further includes a second piston (24). The sub-valve body (3) includes a second piston displacement section (31) and a second piston limiting part. The second piston (24) is slidably engaged with the second piston displacement section (31). The second piston (24) can abut against the second piston limiting part.
2. The directional control valve according to claim 1, characterized in that, The first piston displacement section (121) is cylindrical. The second valve body part (12) further includes a first cover part (124). In the longitudinal direction of the directional valve, the cross-sectional area of the inner contour of the first piston displacement section (121) is larger than that of the inner contour of the first cover part (124). A first limiting step (125) is included between the first piston displacement section (121) and the first cover part (124). The first limiting step (125) serves as the first piston limiting part.
3. The reversing valve according to claim 1, characterized in that, The first valve body part (11) is cylindrical, and the first piston displacement section (121) is cylindrical. Define the inner diameter of the first valve body part (11) as D1 and the inner diameter of the first piston displacement section (121) as D2. Then, the ratio of D1 to D2 satisfies 1.5 - 2.
5.
4. The reversing valve according to claim 1, characterized in that, In the transverse direction of the directional valve, define the length of the first valve body part (11) as H1 and the length of the second valve body part (12) as H2. Then, the ratio of H1 to H2 satisfies 1 - 1.
8.
5. The reversing valve according to claim 1, characterized in that, The second valve body part (12) further includes a first transition part (126). One end of the first transition part (126) is connected to the first piston displacement section (121), and the other end of the first transition part (126) is connected to the first valve body part (11). Define the angle between the first transition part (126) and the first piston displacement section (121) as x. Then, the angle x satisfies 90° - 110°.
6. The directional control valve according to claim 2, characterized in that, The spool component (2) further includes a guide frame (22) and a fixing member. The first piston (23) includes an end plate (231) and a piston bowl (232). The fixing member includes a first fixing member (233) and a second fixing member (234). The first fixing member (233) connects the end plate (231) and the piston bowl (232). The end plate (231) has a first end face (2311) facing the first cover body portion (124). The first fixing member (233) includes a first head (2331). The first head (2331) protrudes from the first end face (2311) toward the first cover body portion (124). The second fixing member (234) connects the first piston (23) and the guide frame (22). The second fixing member (234) includes a second head (2341). The second head (2341) protrudes from the first end face (2311) toward the first cover body portion (124). The main valve body (1) is a stamping part. In the longitudinal direction of the reversing valve, the inner contour of the cross-section of the first cover body portion (124) is non-circular. The first cover body portion (124) includes a first arc portion (1241) and a second arc portion (1243). The first limiting step (125) has a first step surface (1251) facing the first valve body portion (11). The first arc portion (1241) and the second arc portion (1243) extend from the first step surface (1251) toward the side away from the first valve body portion (11). When the first end face (2311) abuts against the first step surface (1251), the first arc portion (1241) corresponds to the first head (2331) in the longitudinal direction of the reversing valve, and the second arc portion (1243) corresponds to the second head (2341) in the longitudinal direction of the reversing valve. When the first end face (2311) abuts against the first step surface (1251), the outer surface of the first head (2331) does not contact the inner wall of the first arc portion (1241), and the outer surface of the second head (2341) does not contact the inner wall of the second arc portion (1243).
7. The directional control valve according to claim 6, characterized in that, The first cover part (124) further includes an intermediate part (1242). The intermediate part (1242) extends from the first step surface (1251) towards the side away from the first valve body part (11). In the circumferential direction of the first piston displacement section (121), the first arc part (1241) and the second arc part (1243) are connected by the intermediate part (1242). It is defined that the minimum distance between the inner wall of the intermediate part (1242) and the inner wall of the first piston displacement section (121) is the first interval, the minimum distance between the inner wall of the first arc part (1241) and the inner wall of the first piston displacement section (121) is the second interval, then the first interval is greater than the second interval, the minimum distance between the inner wall of the second arc part (1243) and the inner wall of the first piston displacement section (121) is the third interval, then the first interval is greater than the third interval.
8. The reversing valve according to claim 2, characterized in that, The main valve body (1) is a tensile member. The first cover part (124) further includes a head part (1244). The head part (1244) is located on the side of the first cover part (124) away from the first valve body part (11), and the center of the head part (1244) protrudes towards the inner cavity of the first cover part (124).
9. The reversing valve according to any one of claims 1-8, characterized in that, The auxiliary valve body (3) and the second valve body part (12) are arranged opposite to each other in the lateral direction of the directional control valve. The second piston displacement section (31) is cylindrical. The auxiliary valve body (3) further includes a second cover part (32). The second cover part (32) is connected to the end of the second piston displacement section (31) on the side away from the first valve body part (11). In the longitudinal direction of the directional control valve, the inner contour of the cross-section of the second cover part (32) is non-circular, and the cross-sectional area of the inner contour of the second piston displacement section (31) is larger than the cross-sectional area of the inner contour of the second cover part (32). A second limiting step (34) is included between the second piston displacement section (31) and the second cover part (32), and the second limiting step (34) serves as the second piston limiting part; in the longitudinal direction of the directional control valve, the cross-sectional area of the inner contour of the second piston displacement section (31) is smaller than the cross-sectional area of the inner contour of the first valve body part (11). The auxiliary valve body (3) further includes a connecting part (33). The connecting part (33) is closer to the second valve body part (12) relative to the second piston displacement section (31). A second transition part (35) is included between the connecting part (33) and the second piston displacement section (31). The connecting part (33) is partially located in the inner cavity of the first valve body part (11), and the outer ring surface (331) of the connecting part (33) is welded and fixed to the inner wall of the first valve body part (11).
10. The reversing valve according to claim 9, characterized in that, The main valve body (1) and the auxiliary valve body (3) are made of stainless steel; the reversing valve further includes a capillary tube (4) and a pilot valve (5), and the capillary tube (4) is connected between the valve body component and the pilot valve (5). The capillary tube (4) includes a first capillary tube (41) and a second capillary tube (42). The second valve body part (12) further includes a first cover body part (124). The first cover body part (124) includes a first side hole (123). The first side hole (123) has a first cylindrical section (1231). In the axial direction of the first side hole (123), the first cylindrical section (1231) protrudes towards the inner cavity of the first cover body part (124). A part of the first capillary tube (41) is connected to the first cylindrical section (1231). The second cover body part (32) includes a second side hole (321). The second side hole (321) has a second cylindrical section (3211). In the axial direction of the second side hole (321), the second cylindrical section (3211) protrudes towards the inner cavity of the second cover body part (32). A part of the second capillary tube (42) is connected to the second cylindrical section (3211); the spool component (2) further includes a spool (21) and a guide frame (22). In the lateral direction of the reversing valve, the guide frame (22) includes a first connection end and a second connection end. The first connection end is connected to the first piston (23), and the second connection end is connected to the second piston (24).