Control valve

Abstract

The control valve comprises a valve body component, a valve element, a piston and a guide sleeve, the piston is located in the valve body component and comprises an open groove and a guide valve port part, an opening of the open groove faces the valve element, at least part of the guide sleeve is located in the open groove, and the guide sleeve is fixedly connected with the piston; a guide channel is formed in the guide sleeve in the longitudinal direction of the control valve in a penetrating mode, at least part of the valve element is located in the guide channel, the valve element is in sliding fit with the wall forming the guide channel, and the valve element can abut against the guide valve opening portion. According to the control valve, the valve element is connected with the piston through the guide sleeve, at least part of the valve element is arranged in the piston, and therefore the guide sleeve can provide displacement guide for the valve element in the switching process of the valve opening state and the valve closing state; and meanwhile, the guide sleeve is fixed in the open slot, so that the piston is connected with the valve core through the guide sleeve, and the processing and forming difficulty of the piston and the valve core can be reduced.

Description

Technical Field

[0001] This invention relates to the field of fluid control technology, and more specifically to a control valve. Background Technology

[0002] In existing control valve designs, the fit between the valve core and the piston is one of the key factors, directly affecting the performance and reliability of the control valve. Figure 10 This is a schematic diagram of a piston component structure for a pilot-operated control valve according to the background art of the present invention. As shown in the figure, the piston component 300 includes a first piston body 310, a second piston body 320, an elastic element 330, and a guide sleeve 340. The first piston body 310 includes a piston base and a second cylindrical portion extending upward along the piston base. In the above structure, since the second piston body 320 is located inside the second cylindrical portion, and the guide sleeve 340 is connected and fixed to the second piston body 320, the movement of the second piston body 320 required for switching the valve is restricted. However, in the above structure, the first piston body 310 and the second cylindrical portion formed on it are not only inconvenient to process and form, but also the first piston body 310 is more difficult to form because a connecting structure needs to be provided on the second cylindrical portion.

[0003] Therefore, in the design of control valves, how to optimize the connection and fit structure between the piston and the valve core and reduce the difficulty of manufacturing and forming parts is a problem that those skilled in the art should consider. Summary of the Invention

[0004] The purpose of this invention is to provide a control valve that solves the problem of reducing manufacturing difficulty while ensuring a stable connection between the piston and the valve core.

[0005] A control valve includes a valve body component, a valve core, a piston, and a guide sleeve. The piston is located within the valve body component and includes an opening groove and a pilot valve port. The opening of the opening groove faces the valve core. The guide sleeve is at least partially located within the opening groove and is fixedly connected to the piston. A guide channel is provided inside the guide sleeve along the longitudinal direction of the control valve. The valve core is at least partially located within the guide channel and slides against the wall forming the guide channel. The valve core can abut against the pilot valve port.

[0006] Furthermore: the guide sleeve includes a guide sleeve base, and an outer edge is provided circumferentially outside the guide sleeve base, the outer edge surface of the outer edge being connected to the groove wall of the opening groove.

[0007] Furthermore, the outer edge surface of the outer edge portion is fixed to the groove wall of the opening groove by threaded connection or welding.

[0008] Furthermore, the guide sleeve also includes a first extension section, which is connected to one end of the guide sleeve base. The first extension section extends longitudinally from the guide sleeve base toward the piston side along the control valve, and the outer diameter of the first extension section is smaller than the outer diameter of the outer edge portion.

[0009] Further: The inner cavity of the control valve includes a first cavity and a second cavity, the first cavity being located above the piston and the second cavity being located below the piston; the opening groove includes a transverse channel, the guide sleeve base includes a longitudinal channel, the transverse channel being located between the guide sleeve base and the end wall of the opening groove, the longitudinal channel communicating with the transverse channel, and in the initial state of valve opening, the first cavity communicating with the pilot valve port through the transverse channel and the longitudinal channel; the piston also includes a balance hole, the balance hole communicating with the second cavity and the transverse channel, and in the initial state of valve opening, the second cavity communicating with the pilot valve port of the pilot valve port through the balance hole and the transverse channel.

[0010] Further: the transverse channel includes a flow-through hole through the first extension section, or the transverse channel includes a flow-through gap disposed between the bottom end of the first extension section and the end wall of the opening groove.

[0011] Further: the valve core includes a valve core base, the valve core base includes a first cylinder and a second cylinder, the second cylinder is located at the end of the first cylinder facing the end wall of the opening groove, and the outer diameter of the first cylinder is larger than the outer diameter of the second cylinder; the control valve also includes a first elastic element located at least partially within the guide channel, the first elastic element is sleeved on the outer periphery of the second cylinder, one end of the first elastic element abuts against the end of the first cylinder, and the other end of the first elastic element abuts against the end wall of the opening groove.

[0012] Furthermore: a groove is formed in the end wall of the opening groove, the groove is connected to the pilot valve port of the pilot valve port, and in the longitudinal direction of the control valve, the projection surface of the groove wall is at least partially located in the projection surface of the outer edge of the outer edge portion, or at least partially located in the projection surface of the outer contour of the first extension section, and the other end of the first elastic member extends into the groove and abuts against the end wall of the groove.

[0013] Furthermore: the valve core base also includes a third cylinder, the diameter of which is not equal to that of the first cylinder; the guide sleeve also includes an inner edge portion, the third cylinder portion is located within the guide channel, and the inner edge portion cooperates with the third cylinder; in the longitudinal direction of the control valve, there is a gap space between the inner edge portion and the first cylinder.

[0014] Furthermore: the control valve is a solenoid valve, and the valve core base has a hole in the longitudinal direction of the control valve. A first limiting boss protruding laterally is provided on the inner wall of the hole. The control valve also includes a moving iron core, which includes a connecting section, a second limiting boss, and a moving iron core base. The moving iron core base is located above the connecting section, and the second limiting boss is located below the connecting section. The connecting section is at least partially located inside the hole. The outer diameter of the third cylinder is smaller than the outer diameter of the first cylinder. When the control valve is in the first open position and the second open position, the second limiting boss can abut against the first limiting boss.

[0015] Further: The valve body component includes a valve body, a sleeve, and a valve seat. The valve body is cylindrical. The sleeve is at least partially connected to one end of the valve body, and the valve seat is at least partially connected to the other end of the valve body. The valve seat includes a main valve port. When the control valve is closed, the piston abuts against the main valve port, and the valve core abuts against the pilot valve port. The guide sleeve also includes a second extension section, which is connected to the other end of the guide sleeve base. The second extension section extends from the guide sleeve base along the longitudinal direction of the control valve away from the piston. The second extension section includes an inner edge and is at least partially located inside the sleeve. The control valve also includes a stationary iron core and a second elastic component. The stationary iron core and the moving iron core are at least partially located inside the sleeve. One end of the second elastic component abuts against the stationary iron core, and the other end of the second elastic component abuts against the moving iron core. The stiffness coefficient of the first elastic component is smaller than that of the second elastic component.

[0016] The present invention provides a control valve in which the valve core is connected to the piston by a guide sleeve and the valve core is at least partially built into the piston. Therefore, the guide sleeve can provide displacement guidance for the valve core during the switching between the open and closed valve states. At the same time, the guide sleeve is fixed in the open groove so as to connect the piston and the valve core through the guide sleeve, thereby reducing the processing and forming difficulty of the piston and the valve core. Attached Figure Description

[0017] Figure 1 This is a cross-sectional schematic diagram of the control valve in the fully closed position according to the present invention;

[0018] Figure 2 For the present invention Figure 1 A cross-sectional view of the control valve in the first open position;

[0019] Figure 3 For the present invention Figure 1 A cross-sectional view of the control valve at the second open position;

[0020] Figure 4 For the present invention Figure 1 A cross-sectional view of the central control valve in the fully open position;

[0021] Figure 5 For the present invention Figure 1 A cross-sectional schematic diagram of the guide sleeve;

[0022] Figure 6 For the present invention Figure 1 A cross-sectional view of the piston;

[0023] Figure 7 For the present invention Figure 1 A three-dimensional structural diagram of the moving iron core;

[0024] Figure 8 For the present invention Figure 1 A three-dimensional structural diagram of the central valve core;

[0025] Figure 9 This is a three-dimensional structural diagram of the connection and cooperation between the moving iron core and the valve core in this invention;

[0026] Figure 10 This is a schematic diagram of the piston component structure of a pilot-operated control valve in the background art of this invention.

[0027] Figures 1-9 The attached figures are labeled as follows:

[0028] 1-Valve body component, 11-Valve body, 111-First cavity, 112-Second cavity, 12-Sleeve, 13-Valve seat, 131-Main valve port, 14-Valve cover, 15-Bushing,

[0029] 2-Stationary iron core,

[0030] 3-Moving iron core, 30-Axial through hole, 31-Connecting section, 32-Second limiting boss, 321-First limiting part, 33-Moving iron core base,

[0031] 4-Valve core, 401-Hole, 402-Horizontal hole, 41-Valve core base, 411-First cylinder, 412-Third cylinder, 413-Second cylinder, 414-First limiting boss, 4141-First limiting part, 42-Steel ball, 43-Notch

[0032] 5-Piston, 50-Open groove, 51-Pilot valve port, 52-Balance hole,

[0033] 6-Guide sleeve, 60-Guide channel, 61-Guide sleeve base, 610-Longitudinal channel, 611-First extension section, 612-Second extension section, 62-Outer edge, 63-Outer edge, 65-Transverse channel,

[0034] 7-Second elastic element,

[0035] 8-First elastic element,

[0036] 91 - First takeover, 92 - Second takeover. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] It should be noted that the directional terms such as "up" and "down" used in this article are in the context of... Figure 1 The directional terms used in this document, defined by their location in the diagram and their relative positions, are merely for clarity and convenience in illustrating the technical solution. It should be understood that the directional terms used herein should not limit the scope of protection claimed in this application.

[0039] Figure 1 This is a cross-sectional schematic diagram of the control valve in the fully closed position according to the present invention; Figure 2 For the present invention Figure 1 A cross-sectional view of the control valve in the first open position; Figure 3 For the present invention Figure 1 A cross-sectional view of the control valve at the second open position; Figure 4 For the present invention Figure 1 A cross-sectional view of the central control valve in the fully open position; Figure 5 For the present invention Figure 1 A cross-sectional schematic diagram of the guide sleeve;

[0040] Figure 6 For the present invention Figure 1 A cross-sectional view of the piston; Figure 7 For the present invention Figure 1 A three-dimensional structural diagram of the moving iron core; Figure 8 For the present invention Figure 1 A three-dimensional structural diagram of the valve core.

[0041] In this embodiment, combined with Figure 1 The longitudinal direction of the control valve is defined as the axial direction of the sleeve 12, while the transverse direction of the control valve is defined as the radial direction of the sleeve 12.

[0042] As shown in the figure, this embodiment uses a solenoid valve as an example for illustration. It includes a valve body component 1, a stationary iron core 2, a moving iron core 3, a valve core 4, a piston 5, a guide sleeve 6, a second elastic element 7, and a first elastic element 8. The valve body component 1 includes a valve body 11, a sleeve 12, a valve seat 13, a valve cover 14, and a bushing 15. In this embodiment, the sleeve 12 is cylindrical. The stationary iron core 2 is welded and fixed to the inner cavity of the sleeve 12. The moving iron core 3 is at least partially located within the inner cavity of the sleeve 12. The moving iron core 3 is connected to the valve core 4 in a limiting connection, and the moving iron core 3 can drive the valve core 4 to move along the axial direction of the sleeve 12 within the inner cavity of the sleeve 12. In this embodiment, the valve cover 14 is flat. The valve body 11 and the sleeve 12 are interconnected through the valve cover 14. The valve cover 14 includes a through mounting hole in the longitudinal direction. The sleeve 12 is welded and fixed to the valve cover 14 by extending into the mounting hole. In this embodiment, the valve body 11 is cylindrical. The valve body 11 is as follows... Figure 1 The upper section shown is welded and fixed to the valve cover 14, and the valve body 11 is as follows. Figure 1 The lower section shown is welded and fixed to the valve seat 13. The valve seat 13 is made of metal material by stretching and / or stamping. The valve seat 13 is at least partially located in the inner cavity of the valve body 11. The valve seat 13 includes a main valve port 131. In this embodiment, the valve body component 1 also includes a first connecting pipe 91 and a second connecting pipe 92. The first connecting pipe 91 extends into the inner cavity of the valve seat 13 and is welded and fixed to the valve seat 13. The valve body 11 has a side hole pre-opened. The bushing 15 is fixed on the outer surface of the valve body 11. The second connecting pipe 92 is at least partially welded and fixed in the bushing 15 so that the inner cavity of the valve body 11 communicates with the second connecting pipe 92 through the side hole. In this embodiment, the first elastic element 8 and the second elastic element 7 are specifically springs. One end of the first elastic element 8 abuts against the valve core 4, and the other end of the first elastic element 8 abuts against the piston 5. One end of the second elastic element 7 abuts against the stationary iron core 2, and the other end of the second elastic element 7 abuts against the moving iron core 3. The stiffness coefficient of the first elastic element 8 is less than that of the second elastic element 7.

[0043] In this embodiment, the piston 5 includes an opening groove 50 and a pilot valve port 51. The opening of the opening groove 50 faces the valve core 4. The guide sleeve 6 is at least partially located within the opening groove 50 and is fixedly connected to the piston 5. A guide channel 60 is provided inside the guide sleeve 6 along the longitudinal direction of the control valve. The valve core 4 is at least partially located within the guide channel 60, and the valve core 4 slides against the wall forming the guide channel 60. The valve core 4 can abut against the pilot valve port 51. Simultaneously, when the control valve is de-energized, i.e., when... Figure 1 When the control valve shown is in the fully closed position, the valve core 4 abuts against the pilot valve port 51 of the piston 5, and the piston 5 abuts against the main valve port 131.

[0044] In this embodiment, the guide sleeve 6 is a separate connection structure from the piston 5, which reduces the processing and forming difficulty of the structure required to connect the valve core 4 and the piston 5. Simultaneously, the guide sleeve 6 also provides displacement guidance for the valve core 4 during the switching between open and closed valve states. The guide sleeve 6 includes a guide sleeve base 61, a guide channel 60 located inside the guide sleeve base 61, and an outer edge 62 circumferentially disposed on the outside of the guide sleeve base 61. The outer edge surface of the outer edge 62 is connected to the groove wall of the opening groove 50. Furthermore, the outer edge surface of the outer edge 62 and the groove wall of the opening groove 50 are fixed by threaded connection or welding. Optionally, the two are fixed by threaded connection. Therefore, the threaded engagement between the piston 5 and the guide sleeve 6 not only ensures convenient connection between the two but also provides a more effective and convenient means of disassembly and assembly when it is necessary to replace internal parts of the control valve.

[0045] Based on the above, the guide sleeve 6 further includes a first extension 611, which is connected to one end of the guide sleeve base 61, such as... Figure 1-4 As shown, the first extension 611 extends from the guide sleeve base 61 along the longitudinal direction of the control valve toward the piston 5, and the outer diameter of the first extension 611 is smaller than the outer diameter of the outer edge 62. This reduces the overall manufacturing cost of the guide sleeve 6.

[0046] Meanwhile, the guide sleeve 6 also includes a second extension 612, the outer diameter of which is smaller than the outer diameter of the outer edge 62. The second extension 612 is connected to the other end of the guide sleeve base 61, such as... Figure 1-4 As shown, the second extension 612 extends from the guide sleeve base 61 along the longitudinal direction of the control valve toward the side away from the piston 5, and at least partially extends out of the opening groove 50. Its advantages are: firstly, it can reduce the overall manufacturing cost of the guide sleeve 6, similar to the first extension 611; secondly, it provides a force-bearing area for the guide sleeve 6 to screw into or out of the opening groove 50, facilitating the assembly and disassembly of the guide sleeve 6; thirdly, the outer diameter of the second extension 612 is slightly smaller than the inner diameter of the sleeve 12, so that when the control valve is in the fully closed position, the second extension 612 is at least partially located within the inner cavity of the sleeve 12, preventing the guide sleeve 6 from colliding with the sleeve 12 during axial upward displacement and affecting the valve opening performance.

[0047] In this embodiment, the control valve includes a first chamber 111 and a second chamber 112. The first chamber 111 is located above the piston 5, and the second chamber 112 is located below the piston 5. The opening groove 50 includes a transverse channel 65, which is located between the guide sleeve base 61 and the end wall of the opening groove 50. The guide sleeve base 61 includes a longitudinal channel 610, which communicates with the transverse channel 65. The control valve is in the initial opening state (this initial opening state refers to...) Figure 3The control valve shown is in the second open position. The first chamber 111 is connected through the longitudinal channel 610, the transverse channel 65, and the pilot valve port 51. The piston 5 also includes a balance hole 52, which connects the second chamber 112 and the transverse channel 65. The control valve is in the initial open position (this initial open position refers to...). Figure 3 When the control valve is in the second open position, the second chamber 112 is connected to the pilot valve port of the pilot valve port 51 via the balance hole 52 and the transverse channel 65. This guides the fluid medium within the first chamber 111 and the second chamber 112 of the control valve, so that the control valve can move from the position shown in the diagram. Figure 3 The second valve opening position shown transitions to, as... Figure 4 The fully open position shown.

[0048] The transverse channel 65 includes a flow-through hole or a flow-through gap. The flow-through hole is formed on the first extension 611. When the flow-through hole structure is adopted, the first extension 611 is as follows: Figure 2 The lower end face, viewed from a certain angle, can abut against the end wall of the opening groove 50; when adopting a flow-through gap structure, a certain distance needs to be reserved between the lower end face of the guide sleeve base 61 / the lower end face of the first extension 611 and the end wall of the opening groove 50, so as to facilitate medium flow. The longitudinal channel 610 can be a through hole penetrating the guide sleeve base 61 longitudinally, and in this embodiment, as shown... Figure 5 The hole wall shown can have a certain distance from the outer edge surface of the outer edge 62 to ensure the best thread fit between the guide sleeve 6 and the piston 5 and high stability.

[0049] Based on the above, if a flow gap is used, the size of the threaded section on the inner wall of the opening groove 50 can be pre-adjusted. At the same time, the non-threaded section of the piston 5 is adjacent to the end wall of the opening groove 50, and the longitudinal length of the non-threaded section needs to be greater than the length of the first extension section 611 of the guide sleeve base 61. This size can be adjusted accordingly based on the length of the first extension section 611. This ensures that after the guide sleeve 6 is screwed into the opening groove 50, there is no need to deliberately adjust the distance between the lower end face of the first extension section 611 and the end wall of the opening groove 50, thus guaranteeing the flow rate.

[0050] In this embodiment, the valve core 4 includes a valve core base 41 and a steel ball 42, with the steel ball 42 located within the valve core base 41. Figure 1 As shown, the lower end of the valve core base 41 is riveted to the steel ball 42 to fix or limit the connection between the two, so that the steel ball 42 can abut against the pilot valve port 51. The valve core base 41 has a through hole 401 in the longitudinal direction, and the steel ball 42 is fixed or limited to the lower section of the hole 401.

[0051] In this embodiment, the valve core 4 includes a valve core base 41, which includes a first cylinder 411 and a second cylinder 413. The second cylinder 413 is located at the end of the first cylinder 411 facing the end wall of the opening groove 50. The outer diameter of the first cylinder 411 is larger than the outer diameter of the second cylinder 413. The control valve also includes a first elastic element 8 located at least partially within the guide channel 60. The first elastic element 8 is sleeved on the outer periphery of the second cylinder 413. One end of the first elastic element 8 abuts against the end of the first cylinder 411, and the other end of the first elastic element 8 abuts against the end wall of the opening groove 50. It can be understood that, due to its position, the rebound force of the first elastic element 8 helps to lift the valve core 4 during the movement of the control valve from the first open position to the second open position. On the one hand, the moving iron core 3 will drive the valve core 4 to move upward, and on the other hand, the first elastic element 8 will push the valve core 4 upward. Under the combined action of the above different forces, the valve core 4 can leave the pilot valve port 51 more quickly.

[0052] In this embodiment, to ensure that the first elastic element 8 remains in the same position without shifting during the elastic change process, on the one hand, since the first elastic element 8 is located within the guide channel 60 of the guide sleeve base 61, the wall forming the guide channel 60 can guide the first elastic element 8 during compression and rebound, improving the operational reliability of the control valve; on the other hand, by providing a groove 501 in the end wall of the opening groove 50, which communicates with the pilot valve port 51, in the longitudinal direction of the control valve, the projection surface of the groove wall 501 is at least partially located within the projection surface of the outer edge 62, or at least partially located within the projection surface of the outer contour of the first extension 611, and the other end of the first elastic element 8 extends into the groove 501 and abuts against the end wall of the groove 501.

[0053] It should be noted that, in conjunction with the above content regarding the transverse channel 65, when adopting the flow interval structure, although the above function can be achieved without the first extension section 611, the distance of the transverse channel 65 should be minimized as much as possible while ensuring the flow rate, in order to avoid the first elastic element 8 lacking radial guidance support from the guide channel 60 corresponding to the second cylinder 413, which would cause unnecessary displacement of the first elastic element 8 during elastic deformation; at this time, the first extension section 611 can reduce the overall cost of the guide sleeve 6 while reducing or avoiding the aforementioned displacement of the first elastic element 8.

[0054] In this embodiment, the valve core 4 is guided by the guide sleeve 6 during the longitudinal movement of the control valve, and this is achieved through a clearance fit between two cylindrical sections of different diameters and corresponding parts of the guide sleeve base 61. Specifically, the valve core base 41 also includes a third cylindrical section 412, the diameter of which is not equal to the diameter of the first cylindrical section 411, and optionally, the outer diameter of the third cylindrical section 412 is smaller than the outer diameter of the first cylindrical section 411; the second extension section 612 also includes an inner edge 63, which is annular. The third cylindrical section 412 is partially located within the guide channel 60, and the inner edge 63 fits with the third cylindrical section 412. The position of the inner edge 63 corresponds to that of the second extension section 612. The inner edge 63 is located on the wall formed by the guide channel 60, and the inner edge 63 protrudes inward in the transverse direction, that is, the inner diameter of the inner edge 63 is smaller than the inner diameter of the guide sleeve base 61. Therefore, under the dual action of the first cylinder 411 cooperating with the guide channel 60 and the third cylinder 412 cooperating with the inner edge 63, the guide sleeve base 61 provides guidance for the displacement of the valve core 4, while further reducing or avoiding the possibility of the valve core 4 shifting during the guiding process, improving the coaxiality of the valve core 4 and the guide valve port 51, and making the sealing between the two more reliable.

[0055] It is understandable that when the valve core 4 is installed, the end face of the inner edge 63 relative to the side of the first cylinder 411 (i.e., as shown) Figure 1-4 The lower end face shown in the image can be seen through the end face on the side of the inner edge 63 opposite to the first cylinder 411 (i.e., as shown in the image). Figure 1-4 The upper surfaces (as shown in the view) abut against each other, and are restricted in the longitudinal direction by the inner edge 63. During installation, the piston 5, guide sleeve 6, valve core 4 and the first elastic element 8 are as a single component, which not only prevents the loss of parts, but also prevents the valve core 4 from detaching from the guide channel 60, thus improving the ease of installation.

[0056] When the control valve is energized and de-energized, the inner edge 63 and the first cylinder 411 have a longitudinal gap. The distance between the inner edge 63 and the first cylinder 411 is defined as H3, then H3 > 0mm. That is, the end face of the first cylinder 411 relative to the inner edge 63 never abuts against the end face of the inner edge 63 relative to the first cylinder 411. In this way, the valve opening performance of the control valve is avoided when the valve core 4 moves during the energization of the control valve.

[0057] In this embodiment, the moving iron core 3 is limited to the valve core 4, and the moving iron core 3 can drive the valve core 4 to move along the axial direction of the sleeve 12.

[0058] Furthermore, such as Figure 8 As shown, a first limiting boss 414 protruding laterally is provided on the inner wall of the hole 401. The first limiting boss 414 is away from the side end face of the moving iron core 3 (i.e., at...). Figure 8The lower end face (under view) is provided with a first limiting part 4141; the moving iron core 3 includes a connecting section 31, a second limiting boss 32, and a moving iron core base 33. The moving iron core base 33 is cylindrical and slides with the sleeve 12. Figure 1-4 From the perspective shown, the moving core substrate 33 is located above the connecting section 31, and the second limiting boss 32 is located below the connecting section 31. The connecting section 31 is at least partially located within the hole 401. The moving core substrate 33 of the connecting section 31 extends downward along the axial direction of the sleeve 12. The second limiting boss 32 protrudes radially outward from the lower section of the connecting section 31 along the sleeve 12, so that the outer diameter of the second limiting boss 32 is larger than the outer diameter of the connecting section 31, and the second limiting boss 32 is close to the side end face of the first limiting boss 414 (i.e., at the...). Figure 7 The upper end face (viewed from the perspective) is provided with a second limiting part 321. Therefore, when the control valve is energized, when the control valve moves the moving iron core 3 to the first valve open position and the second valve open position, the second limiting part 321 of the moving iron core 3 can abut against the first limiting part 4141 of the valve core 4, thereby causing the valve core 4 to disengage from the pilot valve port 51.

[0059] In this embodiment, the moving iron core 3 includes an axially penetrating hole 30, which penetrates the moving iron core 3 as shown in the figure. Figure 1 As shown in the diagram, the axial through-hole 30 is connected to the hole portion 401 on the upper and lower surfaces. It should be noted that since the moving iron core 3 is connected to the valve core 4 via the connecting section 31, the inner diameter of the hole portion 401 must be larger than the inner diameter of the axial through-hole 30. This ensures that the flow rate of the valve core 4 is sufficient to allow the moving iron core 3 to move steadily upwards, preventing the medium between the stationary iron core 2 and the moving iron core 3 from being affected when flowing through the valve core 4 to the groove 50, thus reducing the valve opening performance. The valve core 4 also includes a transverse hole 402, which penetrates the inner and outer spaces of the valve core 4, allowing the hole portion 401 to communicate with the guide channel 60.

[0060] In this embodiment, to make the installation of the moving iron core 3 and the valve core 4 easier and smoother, a notch 43 is provided at the end of the first cylinder 411. The projection of the notch in the transverse direction of the control valve is convex. The notch 43 includes an upper section and a lower section. The upper section can cooperate with the connecting section 31, and the lower section can cooperate with the second limiting boss 32, so that the moving iron core 3 and the valve core 4 can be assembled. The length of the second limiting boss 32 in the longitudinal direction of the control valve is less than the length of the lower section of the notch 43 in the longitudinal direction, so that the connecting section 31 and the second limiting boss 32 of the moving iron core 3 can extend into the hole 401 through the notch 43. The notch 43 not only realizes the quick installation of the moving iron core 3 and the valve core 4, but also accelerates the flow rate of the fluid in the second cavity 112 to the guide valve port 51 when the valve is in the second open position.

[0061] Please refer to the following: Figures 1-4This embodiment describes the valve opening process (the process of moving the control valve from the fully closed position to the fully open position).

[0062] When the control valve is fully closed during a power outage (e.g.) Figure 1 As shown), under the elastic force of the second elastic element 7, the lower end face of the moving iron core base 33 of the moving iron core 3 simultaneously abuts against the valve core base 41 of the valve core 4 and the upper end face of the first limiting boss 41. The valve core 4 abuts against the pilot valve port 51 of the piston 5, and the piston 5 abuts against the main valve port 131. Since the stiffness coefficient of the first elastic element 8 is less than that of the second elastic element 7, the first elastic element 8 is in a compressed state.

[0063] Along the longitudinal direction of the control valve, the second limiting part 321 is located below the first limiting part 4141. When the control valve is de-energized (e.g.) Figure 1 As shown), along the longitudinal direction of the control valve, the distance between the first limiting part 4141 and the second limiting part 321 is H1, and the distance between the stationary iron core 2 and the moving iron core 3 is H2, which satisfies: H2 > H1. When the control valve is energized, since there is a distance H1 between the first limiting part 4141 and the second limiting part 321, and H2 > H1, the moving iron core 3 can move upward along the longitudinal direction of the control valve by a distance H1 until the first limiting part 4141 and the second limiting part 321 abut. During the movement of the moving iron core 3, the moving iron core 3 is only subject to the resistance of the second elastic element 7. Before the first limiting part 4141 and the second limiting part 321 abut, the moving iron core 3 has a free stroke. The moving iron core 3 only needs to overcome the elastic force of the second elastic element 7 to move upward. The electromagnetic attraction force required for the moving iron core 3 is small, thus saving more energy. When the moving iron core 3 approaches the stationary iron core 2 (e.g., ...), the moving iron core 3 moves upward by a distance H1 between the first limiting part 4141 and the second limiting part 321. Figure 2 (As shown), but there is still a distance. Because the two are close, the electromagnetic attraction of the stationary iron core 2 to the moving iron core 3 increases, that is, the kinetic energy of the moving iron core 3 moving upward increases. When the first limiting part 4141 and the second limiting part 321 are in contact, the moving iron core 3 can move upward again, driving the valve core 4 to move upward along the longitudinal direction of the control valve, thereby causing the valve core 4 to disengage from the pilot valve port 51 until the stationary iron core 2 and the moving iron core 3 are attracted together (as shown). Figure 3 As shown), during this process, the rebound force of the first elastic element 8 helps to lift the valve core 4. On the one hand, the moving iron core 3 drives the valve core 4 to move upward, and on the other hand, the first elastic element 8 pushes the guide valve core 4 upward. Under the combined action of the above different forces, the valve core 4 can leave the guide valve port 52 more quickly.

[0064] After the pilot valve port 51 is opened, the fluid above the piston 5 flows through the pilot valve port 51 to the first connecting pipe 91, creating a low-pressure zone above the piston 5 and a high-pressure zone below the piston 5. Under the action of the pressure difference, the piston 5 rises upward along the longitudinal direction of the control valve (e.g., Figure 4As shown, by providing a first elastic element 8 between the valve core 4 and the piston 5, the valve core 4 is kept from falling under the elastic force of the first elastic element 8, that is, it does not contact the pilot valve port 51, thereby further improving the valve opening performance of the control valve.

[0065] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A control valve characterized by, The control valve comprises a valve body (1), a valve core (4), a piston (5) and a guide sleeve (6), the piston (1) is located in the valve body (1), the piston (5) comprises an open slot (50) and a guide valve port (51), the opening of the open slot (50) faces the valve core (4), and the guide sleeve (6) is at least partially located in the open slot (50) and is fixedly connected with the piston (5); A guide channel (60) is arranged through the control valve in the longitudinal direction, the valve core (4) is at least partially located in the guide channel (60), the valve core (4) is in sliding fit with the wall forming the guide channel (60), and the valve core (4) can abut against the guide valve port (51).

2. The control valve according to claim 1, characterized in that The guide sleeve (6) comprises a guide sleeve base body (61), and a peripheral edge portion (62) is arranged on the outer periphery of the guide sleeve base body (61), and the outer edge surface of the peripheral edge portion (62) is connected with the slot wall of the open slot (50).

3. The control valve according to claim 2, characterized in that The outer edge surface of the peripheral edge portion (62) is fixedly connected with the slot wall of the open slot (50) through thread connection or welding.

4. The control valve according to claim 2, characterized in that, The guide sleeve (6) further comprises a first extension section (611), the first extension section (611) is connected to one side end of the guide sleeve base body (61), the first extension section (611) extends from the guide sleeve base body (61) towards the side close to the piston (5) in the longitudinal direction of the control valve, and the outer diameter of the first extension section (611) is smaller than the outer diameter of the peripheral edge portion (62).

5. The control valve according to claim 4, characterized in that The inner cavity of the control valve comprises a first cavity (111) and a second cavity (112), the first cavity (111) is located above the piston (5), and the second cavity (112) is located below the piston (5); the open slot (50) comprises a transverse channel (65), the guide sleeve base body (61) comprises a longitudinal channel (610), the transverse channel (65) is located between the guide sleeve base body (61) and the end wall of the open slot (50), the longitudinal channel (610) is in communication with the transverse channel (65), and in the initial state of opening of the control valve, the first cavity (111) is in communication with the guide valve port (51) through the transverse channel (65) and the longitudinal channel (610); The piston (5) further comprises a balance hole (52), the balance hole (52) is in communication with the second cavity (112) and the transverse channel (65), and in the initial state of opening of the control valve, the second cavity (112) is in communication with the guide valve port of the guide valve port (51) through the balance hole (52) and the transverse channel (65).

6. The control valve according to claim 5, characterized in that The transverse channel (65) comprises a flow hole (651) arranged through the first extension section (611), or the transverse channel (65) comprises a flow interval arranged between the bottom end of the first extension section (611) and the end wall of the open slot (50).

7. A control valve according to any one of claims 2 to 6, wherein The valve core (4) comprises a valve core base (41), the valve core base (41) comprises a first cylinder (411) and a second cylinder (413), the second cylinder (413) is located at the end of the first cylinder (411) towards the end wall side of the opening slot (50), the outer diameter of the first cylinder (411) is larger than that of the second cylinder (413); The control valve further comprises a first elastic member (8) located at least partially in the guide channel (60), the first elastic member (8) is sleeved on the outer periphery of the second cylinder (413), one end of the first elastic member (8) abuts against the end of the first cylinder (411), and the other end of the first elastic member (8) abuts against the end wall of the opening slot (50).

8. The control valve according to claim 7, characterized in that A groove (501) is formed in the end wall of the opening slot (50), the groove (501) is in communication with the guide valve port of the guide valve port portion (51), in the longitudinal direction of the control valve, the projection plane of the groove wall of the groove (501) is at least partially located in the projection plane of the outer edge surface of the outer edge portion (62), or at least partially located in the projection plane of the outer contour of the first extension section (611), and the other end of the first elastic member (8) extends into the groove (501) and abuts against the end wall of the groove (501).

9. The control valve of claim 7, wherein The valve core base (41) further comprises a third cylinder (412), the third cylinder (412) is not equal in diameter to the first cylinder (411), the guide sleeve (6) further comprises an inner edge portion (63), the third cylinder (412) is partially located in the guide channel (60), and the inner edge portion (63) cooperates with the third cylinder (412); In the longitudinal direction of the control valve, there is a spacing space between the inner edge portion (63) and the first cylinder (411).

10. The control valve of claim 9, wherein The control valve is an electromagnetic valve, a hole portion (401) is formed in the inside of the valve core base (41) in the longitudinal direction of the control valve, a first limiting boss (414) protruding in the transverse direction is arranged on the inner wall of the hole portion (401); the control valve further comprises a moving iron core (3), the moving iron core (3) comprises a connecting section (31), a second limiting boss (32) and a moving iron core base (33), the moving iron core base (33) is located above the connecting section (31), the second limiting boss (32) is located below the connecting section (31), the connecting section (31) is at least partially located in the hole portion (401), the outer diameter of the third cylinder (412) is smaller than that of the first cylinder (411), and the second limiting boss (32) can abut against the first limiting boss (414) when the control valve is in a first valve opening position and a second valve opening position.

11. The control valve of claim 9, wherein The valve body component (1) comprises a valve body (11), a sleeve (12) and a valve port seat (13), the valve body (11) is cylindrical, the sleeve (12) is connected to one side end of the valve body (11) at least partially, the valve port seat (13) is connected to the other side end of the valve body (11) at least partially, and the valve port seat (13) comprises a main valve port (131); in the closed state of the control valve, the piston (5) abuts against the main valve port (131), and the valve core (4) abuts against the pilot valve port (51); The guide sleeve (6) further comprises a second extension section (612), which is connected to the other side end of the guide sleeve base body (61), extends from the guide sleeve base body (61) away from the piston (5) along the longitudinal direction of the control valve, and comprises the inner edge (63), and the second extension section (612) is located in the sleeve (12) at least partially; The control valve further comprises a static core (2) and a second elastic component (7), the static core (2) and the moving core (3) are located in the sleeve (12) at least partially, one end of the second elastic component (7) abuts against the static core (2), the other end of the second elastic component (7) abuts against the moving core (3), and the stiffness coefficient of the first elastic component (8) is smaller than that of the second elastic component (7).

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