Three-position four-way reversing valve with locking function

Abstract

The three-position four-way reversing valve with the locking function comprises a valve body and an end cover, a valve sleeve, a first valve element and a second valve element are arranged in the valve body, the first valve element is movably arranged in the valve sleeve, the second valve element is movably arranged in the first valve element, and the end cover is arranged between the first valve element and the second valve element. The second valve element moves and drives the first valve element to move so that liquid circulation can be controlled, and the first valve element has a locking state in the moving process. According to the embodiment of the utility model, pressure control in the prior art is replaced by position control of a plurality of valve cores in reversing and flow regulation, so that the reversing valve has the outstanding advantages of more accurate control, lower control difficulty and the like, and has the characteristics of compact and simple structure and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of reversing valves, in particular to a three-position four-way reversing valve with a locking function. Background Art

[0002] The electro-hydraulic control reversing valve is the core control component of the electro-hydraulic control system. It is a hydraulic reversing valve composed of a solenoid pilot valve and a main valve. The high-pressure fluid in the solenoid pilot valve fluid circuit pushes the main valve core to control the action of the actuator. As a key component of the electro-hydraulic control of hydraulic cylinders, the electro-hydraulic control reversing valve plays an important role in realizing the comprehensive mechanization, automation, and intelligent control of hydraulic systems. At the same time, with the popularization and promotion of intelligent control in various industries, the control accuracy requirements for hydraulic systems are getting higher and higher, and the electro-hydraulic control reversing valve is required to control the flow rate, thereby controlling the speed and direction of the actuator to achieve more precise control.

[0003] The flow control of the existing reversing valve depends on the opening of the main valve core, and the opening of the main valve core is determined by the balance position between the pilot fluid pressure and the spring force; the key to achieving high-precision flow control lies in controlling the pilot fluid pressure. The pilot fluid pressure in the prior art is controlled by adjusting the opening of the electromagnetic pressure reducing valve, and there are also solutions that use high-speed switching valves for regulation. These solutions all have the problem of lack of locking state and energy waste caused by continuous fluid discharge and pressure reduction, and put forward very high requirements on the design and processing of the electromagnet, pilot valve core, and main valve core. At present, high-precision electro-hydraulic proportional reversing valves are difficult to design and manufacture and are costly. Utility Model Content

[0004] In view of this, the utility model aims to provide a three-position four-way directional valve with a locking function to solve the problems in the prior art of the directional valve lacking a locking state and energy waste caused by continuous liquid discharge and pressure reduction, and to solve technical problems such as very high requirements on the design and processing of the electromagnet, pilot valve core and main valve core.

[0005] The utility model provides a three-position four-way reversing valve with a locking function, comprising a valve body and an end cover, wherein a valve sleeve, a first valve core and a second valve core are arranged in the valve body, the first valve core is movably arranged in the valve sleeve, and the second valve core is movably arranged in the first valve core, and the movement of the second valve core drives the movement of the first valve core to control the flow of liquid, and the first valve core has a locking state during the movement.

[0006] In some embodiments, the valve sleeve adopts a cylindrical structure, and a liquid inlet ring groove, a first working ring groove, a second working ring groove and two liquid return ring grooves are arranged on the outer wall of the valve sleeve. The first working ring groove and the second working ring groove are symmetrically arranged with respect to the center line of the liquid inlet ring groove, and the two liquid return ring grooves are symmetrically arranged with respect to the center line of the liquid inlet ring groove.

[0007] In some embodiments, a liquid inlet, a liquid return port, a first working port and a second working port are provided on the valve body; the liquid inlet is connected to the system liquid inlet and the liquid inlet ring groove, the liquid return port is connected to the system liquid return and the two liquid return ring grooves, the first working port is connected to the actuator and the first working ring groove, and the second working port is connected to the actuator and the second working ring groove.

[0008] In some embodiments, when the first valve core is in a locked state, the working port is neither connected to the liquid inlet nor to the liquid return port.

[0009] In some embodiments, radial liquid holes are provided in the liquid inlet ring groove, the first working ring groove, the second working ring groove and the two liquid return ring grooves, and the liquid in each ring groove enters the interior of the valve sleeve through the radial liquid holes.

[0010] In some embodiments, a pilot liquid inlet channel is arranged in the middle of the first valve core, pilot liquid return channels are symmetrically arranged on both sides of the pilot liquid inlet channel, a first liquid passing ring groove and a second liquid passing ring groove are arranged between the pilot liquid inlet channel and each of the pilot liquid return channels, and a first pilot liquid return ring groove and a second pilot liquid return ring groove are arranged on the outer sides of the two pilot liquid return channels.

[0011] In some embodiments, a third liquid ring groove and a fourth liquid ring groove are symmetrically arranged on the outer wall of the second valve core, and the third liquid ring groove and the fourth liquid ring groove are respectively connected to the end faces on both sides of the second valve core through internal liquid passages.

[0012] In some embodiments, on the side of the valve body away from the end cover, the inner wall of one side of the valve body, the end face of the first valve core and the end face of the second valve core are combined to form a first control chamber; on the other side of the valve body close to the end cover, the end face of the first valve core, the end face of the second valve core and the end face of the end cover are combined to form a second control chamber.

[0013] In some embodiments, springs are respectively arranged at both ends of the first valve core, one end of the two springs are connected to the end surface of the first valve core, and the other ends of the two springs are respectively abutted against the bottom surface of the valve body and the inner surface of the end cover.

[0014] In some embodiments, the end of the second valve core facing the end cover is connected to the first end of the connecting rod, and the second end of the connecting rod is connected to a driving assembly for driving the second valve core to reciprocate.

[0015] The embodiment of the utility model replaces the pressure control in the prior art solution by position control of multiple valve cores in switching and flow regulation, which has outstanding advantages such as more precise control and lower control difficulty, and also has the characteristics of compact and simple structure.

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In the drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar parts. The drawings generally illustrate various embodiments by way of example and not limitation, and together with the specification and claims, are used to illustrate the disclosed embodiments. When appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method. The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 It is a schematic diagram of the structure of a three-position four-way reversing valve provided by an embodiment of the utility model and its initial state;

[0019] Figure 2 It is a schematic diagram of a three-position four-way reversing valve provided by an embodiment of the utility model in a first state;

[0020] Figure 3 It is a schematic diagram of a three-position four-way reversing valve provided by an embodiment of the utility model in a second state;

[0021] Figure 4 It is a schematic diagram of a three-position four-way reversing valve provided by an embodiment of the utility model in a third state;

[0022] Figure 5 It is a schematic diagram of a three-position four-way reversing valve provided by an embodiment of the utility model in a fourth state;

[0023] Figure 6 It is a schematic diagram of a three-position four-way reversing valve provided by an embodiment of the utility model in a fifth state;

[0024] Figure 7 It is a schematic diagram of a three-position four-way reversing valve provided by an embodiment of the utility model in a sixth state;

[0025] Figure 8 It is a schematic diagram of a three-position four-way reversing valve provided by an embodiment of the utility model in a seventh state;

[0026] Fig. 9 It is a structural schematic diagram of another three-position four-way reversing valve provided by an embodiment of the utility model.

[0027] The above drawings include the following reference numerals:

[0028] 1-valve body; 2-valve sleeve; 3-first valve core; 4-second valve core; 5-end cover; 6-spring; 7-connecting rod; 8-driving assembly. DETAILED DESCRIPTION

[0029] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings, but are not intended to limit the present invention.

[0030] It should be understood that various modifications may be made to the embodiments disclosed herein. Therefore, the above description should not be considered as limiting, but only as an example of an embodiment. Other modifications within the scope and spirit of the utility model will occur to those skilled in the art.

[0031] The accompanying drawings, which are included in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the general description of the present invention given above and the detailed description of the embodiments given below, are used to explain the principles of the present invention.

[0032] These and other characteristics of the invention will become apparent from the following description of a preferred form of embodiment given as a non-limiting example, with reference to the accompanying drawings.

[0033] It should also be understood that although the present invention has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the present invention that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0034] The above and other aspects, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0035] Specific embodiments of the present invention are described hereinafter with reference to the accompanying drawings; however, it should be understood that the disclosed embodiments are merely examples of the present invention, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that obscure the present invention. Therefore, the specific structural and functional details disclosed herein are not intended to be limiting, but merely serve as the basis and representative basis for the claims to teach those skilled in the art to use the present invention in a variety of ways with substantially any suitable detailed structure.

[0036] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0037] This specification may use the phrases "in one embodiment", "in another embodiment", "in yet another embodiment" or "in other embodiments", all of which may refer to one or more of the same or different embodiments according to the present invention.

[0038] The embodiment of the utility model provides a three-position four-way reversing valve with a locking function, such as Figure 1 As shown, the three-position four-way reversing valve includes a valve body 1 and a valve cover 5, and a valve sleeve 2, a first valve core 3 and a second valve core 4 are arranged in the valve body 1. The second valve core 4 is arranged inside the first valve core 3. The valve sleeve 2 and the valve body 1 can be screwed together by threading, and in other embodiments, they can also be connected by other forms such as flanges, and the specific connection form is not limited.

[0039] Here, the end cover 5 and the valve sleeve 2 can also be connected by tightening to restrict the first valve core 3 and the second valve core 4 inside the valve sleeve 2, and a sealing structure is provided to prevent the liquid inside the valve sleeve 2 from leaking out.

[0040] Specifically, the valve body 1 here adopts a cylindrical structure, and the outer wall of the valve body 1 is provided with a liquid inlet, a liquid return port, a first working port and a second working port along its length direction. The liquid inlet is located in the middle, the first working port and the second working port are respectively located on both sides of the liquid inlet, and the liquid return ports are respectively provided on the outer sides of the first working port and the second working port. The liquid inlet here is connected to an external liquid inlet device as an input end of high-pressure liquid, and the liquid return port is connected to an external liquid return device, which has no pressure or a pressure far lower than the liquid inlet pressure. The first working port and the second working port here are used as control ports to connect actuators, for example, the first working port and the second working port can be respectively connected to a hydraulic cylinder and a hydraulic motor, and the movement direction and movement speed of different actuators can be adjusted by controlling the liquid flow direction and flow rate in the three-position four-way reversing valve. The inner side of the liquid inlet here forms a liquid inlet cavity, the inner side of the liquid return port forms a liquid return cavity, and the inner sides of the first working port and the second working port respectively form working cavities.

[0041] Further, the valve sleeve 2 adopts a cylindrical structure, and a liquid inlet annular groove P, a first working annular groove A, a second working annular groove B and two liquid return annular grooves T are arranged on its outer wall along the length direction of the valve sleeve 2. Through the internal flow channel arrangement of the valve body 1, the liquid inlet annular groove P is connected to the liquid inlet port on the valve body 1, and the two liquid return annular grooves T are simultaneously connected to the liquid return port, the first working annular groove A is connected to the first working port, and the second working annular groove B is connected to the second working port. In this way, the liquid inlet annular groove P is located in the middle of the valve sleeve 2, the first working annular groove A and the second working annular groove B are located on both sides of the liquid inlet annular groove P, and the liquid return annular grooves T are respectively arranged on the outer sides of the first working annular groove A and the second working annular groove B. Among them, the first working annular groove A and the second working annular groove B have the same size, and the two liquid return annular grooves T have the same size.

[0042] Specifically, the liquid inlet ring groove P, the first working ring groove A, the second working ring groove B and the two liquid return ring grooves T form five chambers in sequence, wherein the first working ring groove A and the second working ring groove B are symmetrically arranged relative to the center line of the liquid inlet ring groove P, and similarly, the two liquid return ring grooves T are symmetrically arranged relative to the center line of the liquid inlet ring groove P.

[0043] Furthermore, the interior of the valve sleeve 2 is configured as a through smooth cylindrical surface, and radial liquid holes are provided in each of the annular grooves, through which the liquid in each annular groove can enter the interior of the valve sleeve 2.

[0044] Furthermore, sealing rings are provided between the liquid inlet ring groove P, the first working ring groove A, the second working ring groove B and the two liquid return ring grooves T, and the five chambers can be separated by the sealing rings to prevent liquid from flowing between different chambers.

[0045] The first valve core 3 in this embodiment is arranged in the valve sleeve 2, and it can adopt a hollow cylindrical structure. Through reasonable shape parameter setting, the outer wall of the first valve core 3 is tightly matched with the inner wall of the valve sleeve 2. The first valve core 3 can reciprocate in the valve sleeve 2 along the length direction of the valve sleeve 2. Different moving positions can prevent liquid flow, thereby achieving the effect of controlling liquid circulation.

[0046] Further, a pilot liquid inlet channel Px is provided in the middle of the first valve core 3, pilot liquid return channels Tx are symmetrically provided on both sides of the pilot liquid inlet channel Px, a first liquid passing annular groove Ad and a second liquid passing annular groove Bd are provided between the pilot liquid inlet channel Px and the two pilot liquid return channels Tx along the length direction of the first valve core 3, and a first pilot liquid return annular groove Ta and a second pilot liquid return annular groove Tb are provided on the outer sides of the two pilot liquid return channels Tx along the length direction of the first valve core 3. The first liquid passing annular groove Ad and the second liquid passing annular groove Bd have the same size, and the first pilot liquid return annular groove Ta and the second pilot liquid return annular groove Tb have the same size.

[0047] The interior of the first valve core 3 here is set as a through smooth cylindrical surface, the pilot liquid inlet channel Px is used to connect the inner hole of the second valve core 4 and the liquid inlet ring groove P, and the two pilot liquid return channels Tx are used to connect the first pilot liquid return ring groove Ta and the second pilot liquid return ring groove Tb located on both sides with the liquid return ring groove T.

[0048] Furthermore, the second valve core 4 here is arranged inside the first valve core 3, and it can adopt a cylindrical structure. Through reasonable shape parameter setting, the outer wall of the second valve core 4 is tightly matched with the inner wall of the first valve core 3, and the second valve core 4 can move back and forth inside the first valve core 3 along the length direction of the first valve core 3. The liquid flow can be prevented through different moving positions, thereby achieving the effect of controlling the liquid circulation.

[0049] In addition, in order to enhance the effect of the first valve core 3 and the second valve core 4 in blocking the flow of media between the chambers, a sealing member may be provided at a tightly fitting position.

[0050] Furthermore, a third liquid-passing annular groove Ax and a fourth liquid-passing annular groove Bx are provided on the outer wall of the second valve core 4 along its length direction, wherein the third liquid-passing annular groove Ax and the fourth liquid-passing annular groove Bx are respectively connected to the end surfaces on both sides through internal liquid-passing channels. The third liquid-passing annular groove Ax and the fourth liquid-passing annular groove Bx have the same size.

[0051] Furthermore, on the side of the valve body 1 away from the end cover 5, the inner wall of one side of the valve body 1, the end surface of the first valve core 3 and the end surface of the second valve core 4 are together formed to form a first control chamber KA, and on the other side of the valve body 1 close to the end cover 5, the end surface of the first valve core 3, the end surface of the second valve core 4 and the end surface of the end cover 5 are together formed to form a second control chamber KB.

[0052] The first valve core 3 is in a zero-position control state during initial installation. In the zero-position control state, the center of the first valve core 3 is arranged opposite to the center of the liquid inlet annular groove P, and each annular groove is in a symmetrical structure.

[0053] In some embodiments, Fig. 9 As shown, in order to ensure that the first valve core 3 maintains a zero position state during initial installation, springs 6 are respectively provided at both ends of the first valve core 3, and the two springs 6 have the same shape and the same compression state, one end of the two springs 6 is connected to the end surface of the first valve core 3, and the other ends of the two springs 6 are respectively abutted against the bottom surface of the valve body 1 and the inner surface of the end cover 5, and can also be connected to a component that remains relatively stationary with the valve sleeve 2.

[0054] In other embodiments, in order to ensure the control effect and control accuracy, a displacement sensor (not shown) is provided on the first valve core 3 and / or the second valve core 4, and the position information of the first valve core 3 and / or the second valve core 4 is fed back to an external control device to form a displacement closed-loop control. In other embodiments, a flow sensor (not shown) may also be provided at the position of the first working port and / or the second working port, and the output flow information is fed back to an external control device to form a flow closed-loop control.

[0055] The three-position four-way reversing valve of this embodiment can realize the function of controlling the reversing flow of liquid. In the control process of the three-position four-way reversing valve, the high-pressure liquid in the liquid inlet ring groove P enters the first control chamber KA or the second control chamber KB by controlling the reciprocating movement of the second valve core 4, and then drives the first valve core 3 to move accordingly, so that the first valve core 3 blocks the return liquid chamber and connects the working chamber and the liquid inlet chamber, so as to achieve the purpose of controlling the flow direction of the medium.

[0056] Further, continue as Fig. 9As shown, in order to realize the control of the second valve core 4, the end of the second valve core 4 facing the end cover 5 is connected to the first end of the connecting rod 7, and the second end of the connecting rod 7 is connected to the driving component 8. Here, the movement of the second valve core 4 is controlled by the cooperation of the driving component 8 and the connecting rod 7. In addition, since the second valve core 4 is smaller in size and is subjected to a smaller load, a lower-power driving component can be used for control, which makes it easier to realize control in situations where the power consumption of the control end is limited.

[0057] Further, the connecting rod 7 here can pass through the end cover 5, and a corresponding sealing member is provided between the connecting rod 7 and the end cover 5. In another embodiment, the driving assembly is integrated in the valve body 1 and is located inside the end cover 5.

[0058] The driving component 8 here can be a manual lifting device, or an electrically controlled translation device such as an electromagnet, a linear motor, etc., as long as it can drive the second valve core 4 to move back and forth.

[0059] The working principle of the three-position four-way reversing valve of the utility model embodiment is as follows:

[0060] like Figure 1 As shown, in the initial state, the first valve core 3 is in a zero position control state, at which time the first liquid ring groove Ad connects the first working ring groove A with the liquid return ring groove T on one side, and the second liquid ring groove Bd connects the second working ring groove B with the liquid return ring groove T on the other side. Here, the two working ring grooves on both sides are connected to the liquid return ring groove T at the same time, and the first liquid ring groove Ad and the second liquid ring groove Bd are at a predetermined distance from the liquid inlet ring groove P. At this time, the first valve core 3, the second valve core 4 and each channel maintain static balance, and there is no action or medium circulation.

[0061] Here, by setting the spring 6, it is convenient to make the first spool 3 in the zero-position control state. Among them, when the first spool 3 is in the zero-position control state, the spring forces of the two springs 6 on both sides are the same; when the first spool 3 moves a certain distance in any direction, the spring force on one side decreases while the spring force on the other side increases, which will cause the uneven force on both sides of the first spool 3. At this time, it is necessary to adjust the structural parameter settings of the second spool 4 to change the position of the first spool 3. Specifically, the third liquid passage ring groove Ax of the second spool 4 is simultaneously communicated with the pilot liquid inlet passage Px and the pilot liquid return passage Tx, and a liquid pressure FKA that just balances the spring force is formed in one control chamber, that is, fKA + FKA = fKB (here it is assumed that after the first spool 3 moves to the right, fKA < fKB). In this way, the first spool 3 will be in a dynamic balance state. As the moving distance of the first spool 3 is different, the magnitudes of fKA and fKB are also different. However, since the second spool 4 is controlled not to act, the first spool 3 realizes floating automatic balance, that is, it will automatically find and adjust the balance point of the opening degree of the communication between the third liquid passage ring groove Ax and the pilot liquid inlet passage Px and the pilot liquid return passage Tx, so as to achieve the above dynamic balance state.

[0062] As Figure 2 shown, when the second spool 4 moves in the direction towards the valve cover 5 ( Figure 2 the right side in

[0063] As Figure 3 shown, when the second spool 4 continues to move in the direction towards the valve cover 5 ( Figure 3The third liquid-transmitting annular groove Ax moves to the right side and moves to the working position, that is, when the third liquid-transmitting annular groove Ax is connected with the pilot liquid inlet channel Px, the core body portion located on the left side of the third liquid-transmitting annular groove Ax completely blocks the pilot liquid return channel Tx, and the high-pressure liquid enters the first control chamber KA through the third liquid-transmitting annular groove Ax and the internal channel of the second valve core 4 to increase the pressure in the chamber; at this time, the left side of the first valve core 3 is affected by the liquid pressure, while the right side of the first valve core 3 continues to be connected with the liquid return annular groove T without pressure, so that the first valve core 3 moves to the right under the action of the liquid pressure.

[0064] like Figure 4 As shown, the first valve core 3 continues to move toward the valve cover 5 under the action of the hydraulic pressure ( Figure 4 ), and at this time the second valve core 4 does not move under the action of the external control device, so that after the first valve core 3 moves a certain distance to the right, the connection between the third liquid ring groove Ax and the pilot liquid inlet channel Px will be disconnected and connected with the pilot return liquid channel Tx on one side, and the high-pressure liquid in the first control chamber KA will be quickly discharged through the pilot return liquid channel Tx, so that the liquid pressure on both sides of the first valve core 3 is rebalanced, and at this time the relative positions of the first valve core 3 and the second valve core 4 are in the above-mentioned dynamic equilibrium state.

[0065] At this time, although the first valve core 3 is facing the direction of the valve cover 5 ( Figure 4 The right side of the first liquid ring groove (in the figure) moves a certain distance, but only makes the core part located outside the first liquid ring groove Ad cover a part of the pilot return liquid channel Tx, but has not yet connected to the pilot inlet liquid channel Px.

[0066] like Figure 5 As shown, if the connection state of each chamber needs to be changed through the first valve core 3, it is necessary to continue to move toward the direction of the valve cover 5 ( Figure 5 The second valve core 4 is moved to the right side of the work port, and the first valve core 3 continues to move to the right side by using the valve core following action. In this way, by controlling the second valve core 4 to continue to move toward the first direction, the first valve core 3 is in a following state to regulate the output or input of the fluid medium to the corresponding working port. Figure 5 As shown, when the second valve core 4 continues to move toward the valve cover 5 ( Figure 5The first valve core 3 is moved to the connecting position on the right side of the figure, where the first liquid ring groove Ad is connected with the liquid inlet ring groove P based on the follow-up, and the pilot return liquid channel Tx is blocked to prevent the liquid from entering the pilot return liquid ring groove Ta, and the second liquid ring groove Bd is completely connected with the return liquid ring groove on the corresponding side, so that the first liquid ring groove Ad of the first valve core 3 is always connected with the first working port A, and the second liquid ring groove Bd of the first valve core 3 is always connected with the second working port B.

[0067] When the first valve core 3 is in the follow-up state, the distance moved by the first valve core 3 is the same as the distance moved by the second valve core 4. In this way, the movement direction and distance of the first valve core 3 completely follow the movement direction and distance of the second valve core 4.

[0068] In particular, since there is a follow-up state between the first valve core 3 and the second valve core 4, even if the first valve core 3 changes the connection state of each chamber so that the liquid flows between the chambers, if the position of the second valve core 4 does not change, the dynamic position of the first valve core 3 will not change; and since the medium flow through the hydraulic valve is positively correlated with the opening of the first valve core 3 (that is, the relative position between the first valve core 4 and the liquid inlet ring groove P of the valve sleeve 2), the position of the first valve core 3 can be controlled by the position of the second valve core 4, thereby finally realizing the regulation of the output to the corresponding working port or the output of a certain flow of fluid medium.

[0069] Figure 6 What is shown is that when the first valve core 3 moves to the point where the first liquid-transmitting annular groove Ad is just connected to the liquid-inlet annular groove P, when the first valve core 3 has a locking structural size, the first valve core 3 just completely blocks the pilot liquid return channel Tx, so that the working port is not connected to either the pilot liquid inlet channel Px or the pilot liquid return channel Tx; in other embodiments, when the first valve core 3 has a non-locking structural size, the size of the first valve core 3 is set so that it can only block one of the pilot liquid inlet channel Px and the pilot liquid return channel Tx. For example, the pilot liquid return channel Tx can be completely blocked first, and then the first liquid-transmitting annular groove Ad is connected to the liquid inlet annular groove P by moving the first valve core 3. At this time, a locking state in which the working port is neither connected to the liquid inlet port nor the liquid return port will be achieved. Figure 7 and Figure 8 As shown, the first valve core 3 and the second valve core 4 continue to face the direction of the valve cover 5 ( Figure 7The first valve core 3 moves along the right side of the control chamber KA until the right end surface of the first valve core 3 abuts against the end cover to reach the preset limit position. At this time, even if there is high-pressure liquid in the first control chamber KA, the generated liquid pressure will be transmitted to the end cover to prevent it from moving. At the same time, a limit device (not shown in the figure) is provided for the second valve core 4 so that the movement of the second valve core 4 cannot exceed the preset limit position. During the entire control process of the second valve core 4, the pilot liquid inlet channel Px is always connected to the liquid inlet, and the first pilot liquid return annular groove Ta and the second pilot liquid return annular groove Tb are always connected to the liquid return port.

[0070] Due to the symmetrical arrangement of the first valve core 3 and the second valve core 4, at any position above, if the opening of the first valve core 3 is to be reduced or the second working port B is to be switched to liquid inlet, it can be achieved by simply moving the second valve core 4 to the other side, i.e., the second direction (i.e., left movement in the figure). In other words, the connection direction and flow rate of the three-position four-way reversing valve can be adjusted arbitrarily by moving the second valve core 4 left and right.

[0071] The embodiment of the utility model replaces the pressure control in the prior art solution by position control of multiple valve cores in switching and flow regulation, and has outstanding advantages such as more precise control and lower control difficulty, and also has the characteristics of compact and simple structure.

[0072] The above describes in detail a number of embodiments of the present invention, but the present invention is not limited to these specific embodiments. Those skilled in the art can make various variations and modifications to the embodiments based on the concept of the present invention, and these variations and modifications should all fall within the scope of protection claimed by the present invention.

[0073] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0074] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0075] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present utility model.

[0076] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0077] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A three-position four-way reversing valve with a locking function, characterized in that: It includes a valve body and an end cover, wherein a valve sleeve, a first valve core and a second valve core are arranged in the valve body, the first valve core is movably arranged in the valve sleeve, and the second valve core is movably arranged in the first valve core, and the movement of the second valve core drives the movement of the first valve core to realize the control of liquid flow, and the first valve core is in a locked state during the movement.

2. The three-position four-way reversing valve according to claim 1, characterized in that: The valve sleeve adopts a cylindrical structure, and a liquid inlet ring groove, a first working ring groove, a second working ring groove and two liquid return ring grooves are arranged on the outer wall of the valve sleeve. The first working ring groove and the second working ring groove are symmetrically arranged relative to the center line of the liquid inlet ring groove, and the two liquid return ring grooves are symmetrically arranged relative to the center line of the liquid inlet ring groove.

3. The three-position four-way reversing valve according to claim 2, characterized in that: The valve body is provided with a liquid inlet, a liquid return port, a first working port and a second working port; the liquid inlet is connected to the system liquid inlet and the liquid inlet ring groove, the liquid return port is connected to the system liquid return and the two liquid return ring grooves, the first working port is connected to the actuator and the first working ring groove, and the second working port is connected to the actuator and the second working ring groove.

4. The three-position four-way reversing valve according to claim 3, characterized in that: When the first valve core is in a locked state, the working port is neither communicated with the liquid inlet nor with the liquid return port.

5. The three-position four-way reversing valve according to claim 4, characterized in that: The liquid inlet annular groove, the first working annular groove, the second working annular groove and the two liquid return annular grooves are all provided with radial liquid holes, through which the liquid in each annular groove enters the interior of the valve sleeve.

6. The three-position four-way reversing valve according to claim 4, characterized in that: A pilot liquid inlet channel is arranged in the middle of the first valve core, and pilot liquid return channels are symmetrically arranged on both sides of the pilot liquid inlet channel, a first liquid passing ring groove and a second liquid passing ring groove are arranged between the pilot liquid inlet channel and each of the pilot liquid return channels, and a first pilot liquid return ring groove and a second pilot liquid return ring groove are arranged on the outer sides of the two pilot liquid return channels.

7. The three-position four-way reversing valve according to claim 4, characterized in that: A third liquid-transmitting annular groove and a fourth liquid-transmitting annular groove are symmetrically arranged on the outer wall of the second valve core. The third liquid-transmitting annular groove and the fourth liquid-transmitting annular groove are respectively connected to the end faces on both sides of the second valve core through internal liquid-transmitting channels.

8. The three-position four-way reversing valve according to claim 4, characterized in that: On the side of the valve body away from the end cover, the inner wall of one side of the valve body, the end face of the first valve core and the end face of the second valve core together form a first control chamber; on the other side of the valve body close to the end cover, the end face of the first valve core, the end face of the second valve core and the end face of the end cover together form a second control chamber.

9. The three-position four-way reversing valve according to claim 1, characterized in that: Springs are respectively arranged at both ends of the first valve core, one end of the two springs is connected to the end surface of the first valve core, and the other ends of the two springs are respectively abutted against the bottom surface of the valve body and the inner surface of the end cover.

10. The three-position four-way reversing valve according to claim 1, characterized in that: The end of the second valve core facing the end cover is connected to the first end of the connecting rod, and the second end of the connecting rod is connected to a driving component for driving the second valve core to reciprocate.

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