A rotary valve core and a rotary valve

Abstract

The present invention relates to the technical field of control valves, and discloses a rotary valve core and a rotary valve. The rotary valve core is rotatably assembled in the valve body of the rotary valve, and includes a rotary body. A diversion chamber, a fluid inlet, a fluid outlet and a balance groove are formed in the rotary body. The diversion chamber is formed inside the rotary body; the fluid inlet penetrates through the outer peripheral wall of the rotary body and is communicated with the diversion chamber; the fluid outlet penetrates through the outer peripheral wall of the rotary body and is communicated with the diversion chamber, and the fluid outlet is arranged at an interval along the axial direction of the rotary body relative to the fluid inlet; the balance groove is formed on the outer peripheral wall of the rotary body facing away from the fluid outlet and is communicated with the diversion chamber. When the rotary body is in the diversion position in the valve body, the balance groove reduces the fluid pressure acting on the rotary body in the radial direction of the rotary body at the balance groove or cancels the fluid pressure acting on the rotary body in the radial direction of the rotary body at the fluid outlet, so that the rotary valve core can rotate smoothly in the valve body and is not prone to eccentric wear and jamming.

Description

Technical Field

[0001] The present invention relates to the technical field of control valves, and in particular to a rotary valve core and a rotary valve. Background Art

[0002] At present, most of the hydraulic valves on the market are spool valves, and the valve core moves axially in the mating hole of the valve body to close the oil circuit.

[0003] In addition to the spool valve realizing the opening and closing switching of the oil circuit, there are also some rotary valves used to realize the opening and closing switching of the oil circuit. Different from the axial sliding control structure of the spool valve, the rotary valve mainly switches the opening and closing of the oil circuit by rotating the valve core. For example, the Chinese patent with the patent number CN204805623U discloses a rotary valve for a double-cylinder swing mechanism. The rotary valve core of the rotary valve changes the closing and connection between the slotted groove on itself and the oil port of the valve body through rotary motion. Then, when connected, the hydraulic oil is automatically distributed to different oil paths of the left and right rotary cylinders, realizing the continuous and regular switching of high and low pressure oils at the piston end and the piston rod end of the left and right rotary cylinders during the entire rotation process, ensuring the continuity of rotation and realizing the forward and reverse rotation of the mechanism. However, when the existing rotary valve core works in the valve body, the position of the flow outlet of the rotary valve core will be subjected to the radial force of the hydraulic oil, resulting in a certain eccentric load on the rotary valve core under the action of the hydraulic pressure, which easily causes eccentric wear and jamming between the rotary valve core and the valve body.

[0004] Therefore, there is an urgent need to provide a rotary valve core and a rotary valve, in which the rotary valve core can rotate smoothly in the valve body of the rotary valve and is not prone to eccentric wear and jamming. Summary of the Invention

[0005] An object of the present invention is to provide a rotary valve core that can rotate smoothly in the valve body of a rotary valve and is not prone to eccentric wear and jamming.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] A rotary valve core is configured to be rotatably assembled in the valve body of a rotary valve, and includes a rotary body, on which the following are provided:

[0008] A diversion chamber, which is opened in the rotary body;

[0009] An inlet, which penetrates the outer peripheral wall of the rotary body and communicates with the diversion chamber;

[0010] An outlet, which penetrates the outer peripheral wall of the rotary body and communicates with the diversion chamber, and the outlet is axially spaced from the inlet along the rotary body.

[0011] A balance groove is formed on the outer peripheral wall of the rotary body facing away from the fluid outlet, and is communicated with the diversion chamber. When the rotary body is in the diversion position within the valve body, the balance groove is configured to reduce or offset the fluid pressure acting on the rotary body in the radial direction of the rotary body at the balance groove by the fluid pressure acting on the rotary body in the radial direction of the rotary body at the fluid outlet.

[0012] Optionally, the rotary body includes at least two balance grooves, two fluid inlets, two diversion chambers and two fluid outlets. Each fluid inlet is sequentially communicated with one diversion chamber and one fluid outlet to form two independent diversion channels, and each diversion chamber is respectively communicated with at least one balance groove to reduce or offset the fluid pressure acting on the rotary body in the radial direction of the rotary body at the two fluid outlets.

[0013] Optionally, the two fluid inlets are arranged at intervals along the axial direction of the rotary body, the two fluid outlets are evenly arranged at intervals along the circumferential direction of the rotary body, and at least one balance groove is arranged on both sides of each fluid outlet along the axial direction of the rotary body.

[0014] Optionally, the number of the balance grooves formed on the outer peripheral wall of the rotary body facing away from the fluid outlet is two, and the two balance grooves are arranged at intervals along the axial direction of the rotary body on both sides of the fluid outlet.

[0015] Optionally, the groove body of the balance groove extends along the circumferential direction of the rotary body, and one end of one of the two balance grooves formed on the outer peripheral wall of the rotary body facing away from the fluid outlet along the circumferential direction of the rotary body and the other end of the other balance groove along the circumferential direction of the rotary body are respectively communicated with the diversion chamber.

[0016] Optionally, the rotary body is further provided with:

[0017] A pressure relief channel includes a pressure relief outlet and a pressure relief inlet. The pressure relief outlet is communicated with the pressure relief inlet, and the pressure relief inlet is arranged at intervals along the circumferential direction of the rotary body on one side of the fluid outlet, and the pressure relief outlet penetrates through one end of the rotary body along the axial direction of the rotary body.

[0018] Another object of the present invention is to provide a rotary valve, the rotary valve core of which can rotate smoothly within the valve body of the rotary valve and is not prone to eccentric wear and jamming.

[0019] To achieve this object, the present invention adopts the following technical solutions:

[0020] A rotary valve includes a valve body. An installation hole is formed in the valve body, an inlet and an outlet are respectively formed through the side wall of the valve body and communicate with the installation hole. The rotary valve further includes the rotary valve core as described above. The rotary valve core is rotatably disposed in the installation hole. The inner wall of the installation hole and the balance groove form a receiving cavity for receiving fluid. The inlet communicates with the inlet, and the outlet can communicate with the outlet.

[0021] Optionally, it further includes:

[0022] An annular groove is formed around the outer peripheral wall of the rotary body and / or the inner wall of the installation hole. The annular groove communicates the inlet with the inlet to balance the radial force on the rotary body at the inlet.

[0023] Optionally, the rotary valve further includes:

[0024] A sealing assembly is disposed in a sealing assembly groove formed in the valve body and sleeved at both ends of the rotary valve core to seal the gap between the outer peripheral wall of both ends of the rotary valve core passing through the installation hole and the installation hole.

[0025] Optionally, a drainage and pressure increasing hole communicating the sealing assembly groove with the inlet is further formed in the valve body. An annular receiving groove communicating with the drainage and pressure increasing hole is formed at one end of the sealing assembly along the axial direction of the installation hole. The rotary valve core passes through the annular middle hole of the annular receiving groove. From the notch to the bottom of the annular receiving groove, the groove width of the annular receiving groove gradually decreases.

[0026] The beneficial effects of the present invention:

[0027] Different from the existing rotary valve core, the rotary valve core of the present invention is provided with a balance groove. The balance groove is formed on the outer peripheral wall of the rotary body facing away from the outlet and communicates with the diversion chamber. When the rotary body rotates in the valve body to achieve diversion, the balance groove can reduce or offset the fluid pressure along the radial direction of the rotary body at the balance groove on the rotary body, and further finally enable the rotary valve core to rotate smoothly in the valve body and is not prone to eccentric wear and jamming. Description of the Drawings

[0028] Figure 1 is a schematic structural diagram of the rotary valve in Embodiment 1 provided by the present invention;

[0029] Figure 2 is a schematic cross-sectional view of the rotary valve in Embodiment 1 provided by the present invention;

[0030] Figure 3Schematic structure of the rotary valve core in Embodiment 1 provided by the present invention Figure 1 ;

[0031] Figure 4 Schematic structure of the rotary valve core in Embodiment 1 provided by the present invention Figure 2 ;

[0032] Figure 5 is Figure 4 the schematic cross-sectional view at A-A in

[0033] Figure 6 is Figure 5 the schematic cross-sectional view at B-B in

[0034] Figure 7 is Figure 4 the schematic cross-sectional view at C-C in

[0035] Figure 8 is Figure 4 the schematic cross-sectional view at D-D in

[0036] Figure 9 is Figure 4 the schematic cross-sectional view at E-E in

[0037] Figure 10 Schematic cross-section at the outlet position of the rotary valve in Embodiment 1 provided by the present invention Figure 1 ;

[0038] Figure 11 Schematic cross-section at the outlet position of the rotary valve in Embodiment 1 provided by the present invention Figure 2 ;

[0039] Figure 12 Schematic cross-section at the outlet position of the rotary valve in Embodiment 1 provided by the present invention Figure 3 ;

[0040] Figure 13 Schematic structure diagram of the rotary valve core in Embodiment 2 provided by the present invention;

[0041] Figure 14 Schematic cross-sectional view of the rotary valve in Embodiment 2 provided by the present invention.

[0042] In the figure:

[0043] 1 - Rotary body; 11 - Diversion chamber; 12 - Inlet; 13 - Outlet; 14 - Balance groove; 15 - Pressure relief channel; 151 - Pressure relief outlet; 152 - Pressure relief inlet; 16 - Annular groove; 17 - Communication hole; 2 - Valve body; 22 - Inlet; 23 - Outlet; 25 - Drainage and pressurization hole; 3 - Sealing assembly; 31 - Annular accommodation groove; 4 - End cover; 5 - Pressing plate. Detailed Implementation Modes

[0044] To make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present invention clearer, the technical solutions of the present invention will be further described below with reference to the accompanying drawings and through specific implementation modes.

[0045] In the description of the present invention, unless otherwise clearly specified and defined, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal connection or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present invention, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0047] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left", and "right" are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0048] Embodiment 1

[0049] As Figures 1 - 3As shown in the figure, this embodiment provides a rotary spool valve and a rotary valve. The rotary spool valve of this embodiment is mainly related to the spool valve of a hydraulic rotary valve, but is not limited to this specific field. The advantage of the rotary spool valve is that it can rotate smoothly within the valve body 2 of the rotary valve and is not prone to eccentric wear and jamming. The rotary valve includes a valve body 2 and this rotary spool valve. The valve body 2 is provided with a mounting hole (not marked in the figure), an inlet 22 and an outlet 23 that respectively penetrate the outer peripheral wall of the valve body 2 and communicate with the mounting hole. The rotary spool valve is rotatably inserted into the mounting hole, and the side peripheral wall of the rotary spool valve is in clearance fit with the inner part of the mounting hole. The inlet 22 is used to introduce fluids such as hydraulic oil into the rotary valve, and the outlet 23 is used to output fluids such as hydraulic oil. The part of the rotary spool valve in this embodiment that is the same as the existing structure mainly includes a rotation connection section (not marked in the figure) and a control section (not marked in the figure) inserted into the valve body 2 for controlling the opening and closing of the flow and the operation. The rotation connection section is connected to an external rotation execution structure (not shown in the figure), such as a motor, through a hinge connection, thereby driving the rotary spool valve to perform a rotational movement, which will not be elaborated here.

[0050] As Figure 2 shown, the rotary spool valve includes a rotary body 1. The rotary body 1 is provided with a diversion chamber 11, an inlet 12, an outlet 13, and a balance groove 14. Among them, the diversion chamber 11 is opened inside the rotary body 1; the inlet 12 penetrates the outer peripheral wall of the rotary body 1, and the inlet 12 communicates with the diversion chamber 11; the outlet 13 penetrates the outer peripheral wall of the rotary body 1 and communicates with the diversion chamber 11, and the outlet 13 is axially spaced from the inlet 12 along the rotary body. It should be noted that the outlet 13 being axially spaced from the inlet 12 along the rotary body can be arranged side by side and spaced apart, or can be arranged with a circumferential dislocation along the rotary body while maintaining a spacing along the axial direction of the rotary body, aiming to ensure that the inlet 12 and the outlet 13 are axially offset. Among them, one inlet 12, one diversion chamber 11, and one outlet 13 are sequentially connected to form an independent diversion channel. Correspondingly, the balance groove 14 is opened on the outer peripheral wall of the rotary body 1 facing away from the outlet 13, and the balance groove 14 communicates with the corresponding diversion chamber 11. When the rotary body 1 of the rotary spool valve is rotatably inserted into the mounting hole of the valve body 2 for diversion, the balance groove 14 and the inner wall of the mounting hole can enclose a cavity for accommodating fluid, and the outlet 13 can communicate with the outlet 23. The balance groove 14 is configured to reduce or offset the fluid pressure acting on the rotary body 1 in the radial direction of the rotary body at the balance groove 14 by the fluid pressure acting on the rotary body 1 in the radial direction of the rotary body at the outlet 13.

[0051] Furthermore, specifically, in this embodiment, a total of two independent and non - communicating diversion channels are formed on the rotary body 1. That is, as Figures 3 - 5As shown in the figure, the rotary body 1 includes four balance grooves 14, two inlets 12, two guide chambers 11, and two outlets 13. However, each inlet 12 is sequentially connected to a guide chamber 11 and an outlet 13 in the manner described above. Therefore, two independent guide channels are formed on the rotary body 1. In addition, the guide chambers 11 in each guide channel are connected to the two balance grooves 14 in the manner described above to reduce or offset the fluid pressure acting on the rotary body 1 in the radial direction of the rotary body at the two outlets 13. The design of two independent guide channels in this embodiment has the advantage that by rotating a rotary valve core, the cooperation and conduction between the two guide channels and the valve body 2 can be realized, thereby providing a variety of different conduction working modes. The specific details will be described in detail during the working process of the rotary valve and will not be elaborated here.

[0052] It can be imagined that for different control valves, the number of guide channels on the rotary body 1 can also be designed as one, three, four, or even more according to actual needs, as long as balance grooves 14 are provided on the rotary body 1 to be paired with the outlets 13 in each guide channel to reduce or offset the fluid pressure acting on the rotary body 1 in the radial direction of the rotary body at each outlet 13, so as to achieve the effect that the rotary valve core is not prone to eccentric wear and jamming.

[0053] In addition, in this embodiment, along the axial direction of the rotary body, a balance groove 14 is provided on each side of the outlets 13 of the two guide channels, forming a total of four balance grooves 14. Two balance grooves 14 on both sides of one outlet 13 are connected to the guide chamber 11 of the guide channel where the other outlet 13 is located; the remaining two balance grooves 14 are connected to the guide chamber 11 of the other guide channel. It can be imagined that in other embodiments, the number of balance grooves 14 can be one, three, four, or more, as long as the balance grooves 14 are located on the side opposite to the outlet 13, and the fluid pressure acting on the rotary body 1 in the radial direction at the balance grooves 14 of the rotary body 1 is the same in magnitude and opposite in direction to the fluid pressure acting on the rotary body 1 in the radial direction at the outlet 13.

[0054] Furthermore, as Figures 2 - 5 shown, in this embodiment, an annular groove 16 is formed by surrounding and opening on the outer peripheral wall of the rotary body 1. The annular groove 16 connects the inlet 12 to the inlet 22 to balance the radial force acting on the rotary body 1 at the inlet 12.

[0055] To facilitate understanding of the principle that the rotary valve core is not prone to eccentric wear and jamming, only one of the two guide channels in this embodiment is taken as an example to introduce the hydraulic oil. As Figure 2 shown, the flow path of the hydraulic oil is:

[0056] Inlet 22 → annular groove 16 → inlet 12 → diversion chamber 11 → outlet 13 → outlet 23; meanwhile, part of the hydraulic oil simultaneously flows into the two balance grooves 14 communicated with the diversion chamber 11 through the diversion chamber 11, and the two balance grooves 14 are located on one side of the rotary body 1 opposite to the outlet 13 through which the hydraulic oil passes.

[0057] It should be noted that since the balance groove 14 in this embodiment is an arc-shaped groove extending along the circumferential direction of the rotary body, the two balance grooves 14 have the same size and shape, and the two balance grooves 14 are located on one side opposite to the outlet 23 and are symmetrically distributed on both sides of the outlet 13 along the axial direction of the rotary body. Therefore, the fluid pressure along the radial direction of the rotary body 1 at the two balance grooves 14 can offset the fluid pressure along the radial direction of the rotary body 1 at the outlet 13.

[0058] Furthermore, in this embodiment, by adding the balance groove 14, the fluid pressure along the radial direction of the rotary body 1 at the outlet 13 is offset. It can be imagined that in other embodiments, it is also possible not to completely offset the fluid pressure along the radial direction of the rotary body 1 at the outlet 13, that is, by changing the number and size of the balance grooves 14, and further weakening the fluid pressure along the radial direction of the rotary body 1 at the outlet 13 is also possible, and it can also achieve the effect of reducing the eccentric wear and jamming of the rotary body 1, but completely offsetting the fluid pressure along the radial direction of the rotary body 1 at the outlet 13 has a better effect in reducing eccentric wear and jamming.

[0059] Moreover, the balance groove 14 is an arc-shaped groove extending along the circumferential direction of the rotary body. In other embodiments, it can also be a groove with other shapes and extension directions, as long as it can cooperate with the inner wall of the mounting hole to form a receiving cavity for accommodating fluid, so that the rotary body 1 is subjected to fluid pressure along the radial direction of the rotary body 1 at this place.

[0060] Therefore, for a diversion channel, by adopting the above design structure, the fluid pressure along the radial direction of the rotary body 1 at the outlet 13 in one diversion channel on the rotary body 1 can be offset. Similarly, for the structure, positional relationship and force analysis of the outlet 13 and the corresponding two balance grooves 14 in another diversion channel are the same as the above situation, so they will not be elaborated here.

[0061] Furthermore, for the positional relationship of the respective diversion chambers 11, inlets 12, outlets 13, balance grooves 14 and annular grooves 16 in the two diversion channels in this embodiment. As Figure 5As shown in the figure, the two diversion chambers 11 are cylindrical cavities extending along the axial direction of the rotary body. The rotary body 1 includes a body part and two plugs. The two plugs block the cylindrical blind holes opened on the body part and extending along the axial direction of the rotary body, thereby forming the rotary body 1 and two independent and non - communicating diversion chambers 11. The two inlets 12 are arranged at intervals along the axial direction of the rotary body, and the two outlets 13 are evenly arranged at intervals along the circumferential direction of the rotary body. In this embodiment, the outlet 13 has a "U" - shaped groove structure penetrating the outer peripheral wall of the rotary body 1. The notch directions of the two outlets 13 extend along the radial direction of the rotary body and are opposite. The inlet 12 has a through - hole structure. Along the axial direction of the rotary body, a balance groove 14 is arranged on each side of each outlet 13. The two annular grooves 16 are respectively arranged around the outer peripheral wall of the rotary body 1 corresponding to the two inlets 12, and the overall structure layout is symmetrical and compact.

[0062] Furthermore, Figures 7 - 9 The figures show cross - sectional views of different positions of two independent diversion channels on the rotary body 1. For the sake of easy understanding, take the Figures 7 - 9 diversion chamber 11 on the left side of the drawing as an example. In Figure 7 , the diversion chamber 11 on the left side of the drawing is connected to a balance groove 14 on the right side of the drawing through a communication hole 17; in Figure 9 , the diversion chamber 11 on the left side of the drawing is connected to a balance groove 14 on the right side of the drawing through another communication hole 17; at the same time, as Figure 8 shown, the diversion chamber 11 on the left side of the drawing is connected to the outlet 13 on the left side of the drawing, so that the diversion chamber 11 on the left side of the drawing can simultaneously convey fluid to Figure 7 and Figure 9 the two balance grooves 14 on the right side of the drawing in Figure 8 , and convey fluid to the outlet 13 on the left side of the drawing in

[0063] Furthermore, as Figure 5 and Figures 7 - 9 shown, one end of a balance groove 14 along the circumferential direction of the rotary body in the two balance grooves 14 on both sides of any outlet 13 is connected to the corresponding diversion chamber 11 in the two diversion chambers 11, and the other end of the other balance groove 14 along the circumferential direction of the rotary body is connected to the other corresponding diversion chamber 11 in the two diversion chambers 11. The advantage of adopting this connection method is that when the diversion chamber 11 conveys fluid (such as media like hydraulic oil and hydraulic water) to the two balance grooves 14, the fluid will generate an instantaneous impact in the accommodation cavities respectively formed by the two balance grooves 14 and the inner wall of the mounting hole, thereby causing the rotary body 1 to generate a torque for rotating around the axis of the rotary body. In order to offset the torque generated by this impact. TakeFigures 7 - 9 Taking the diversion chamber 11 on the left side in [description] as an example, in this embodiment Figure 7 One end of one of the two balance grooves 14 on both sides of the outlet 13 on the right side of the drawing in [description] along the circumferential direction of the rotary body is Figures 7 - 9 connected to the diversion chamber 11 on the left side of the drawing in [description], while the other end of the other balance groove 14 along the circumferential direction of the rotary body (as Figure 9 shown) is Figures 7 - 9 connected to the diversion chamber 11 on the left side of the drawing in [description]. Thus, the torsional forces generated at these two balance grooves 14 of the rotary body 1 can cancel each other out, thereby preventing the rotation of the rotary body 1 and making the operation of the rotary valve core more stable and reliable. Similarly, for the other diversion channel ( Figures 7 - 9 the diversion channel where the diversion chamber 11 on the right side in [description] is located), the connection structure of the corresponding two balance grooves 14 ( Figure 7 and Figure 9 the balance groove 14 on the left side of the drawing in [description]) also adopts the same connection arrangement, and details will not be elaborated here. Finally, the problem that the instantaneous impact of hydraulic oil in the balance groove 14 causes the rotary body 1 to rotate around the axis of the rotary body is solved.

[0064] In addition, for the specific structure of the rotary valve. As Figures 10 - 12 shown, in this embodiment, there are a total of four outlet ports 23 on the valve body 2, and the outlet ports 23 are evenly arranged in a circular array along the circumferential direction of the valve body 2. The two outlet ports 13 of the rotary valve core are respectively used to correspond and connect to the four outlet ports 23. Among them, Figure 10 shown is the state where the rotary valve core rotates counterclockwise until each outlet port 13 is respectively connected to two adjacent outlet ports 23; Figure 11 shown is a schematic diagram of the rotary valve core further rotating counterclockwise so that one of the two outlet ports 23 connected by each outlet port 13 is in a semi-closed state; Figure 12 is the state diagram when the rotary valve core further rotates counterclockwise so that the two outlet ports 13 are respectively connected to one outlet port 23 and two outlet ports 23 are closed. Thus, the rotary valve core can switch and change the opening and closing of the four outlet ports 23 and the connection relationship with the two diversion channels on the rotary valve core by rotating clockwise or counterclockwise. Since this part of the rotary control is a conventional control structure of the rotary valve, no further elaboration will be made here.

[0065] In addition, it should be noted that in this embodiment, there are a total of four outlet ports 23. It can be imagined that in other embodiments, according to the actual design requirements of the rotary valve, the number of outlet ports 23 can also be adjusted to three, five, six or more. Since the structure and number of the outlet ports 23 are adaptive adjustments of existing conventional structures, no further description will be given to them.

[0066] Furthermore, asFigures 3 - 6 and Figures 11 - 12 As shown in Figures 5 - 6 , in this embodiment, a pressure relief passage 15 is further provided on the rotary body 1 (as shown in Figures 5 - 6 ). Figures 5 - 6 The pressure relief passage 15 includes a pressure relief outlet 151 and a pressure relief inlet 152 (as shown in Figure 3 and Figure 6 ). Figure 3 and Figure 6 The pressure relief outlet 151 is communicated with the pressure relief inlet 152, and the pressure relief inlet 152 is arranged at one side of the flow outlet 13 at intervals along the circumferential direction of the rotary body (as shown in Figure 3 ), and the pressure relief outlet 151 penetrates through one end of the rotary body 1 along the axial direction of the rotary body. The pressure relief passage 15 is mainly used to relieve the pressure of the hydraulic oil in the closed outlet 23 when the rotary valve core rotates. Figure 3 Specifically, taking the flow outlet 13 on the upper right side of the drawing in Figure 11 as an example to deliver hydraulic oil to two adjacent outlets 23. As shown in Figure 6 and Figure 11 , Figure 11 shows a schematic diagram of the rotary valve core further rotating counterclockwise so that one of the two outlets 23 communicated with the flow outlet 13 is in a semi-closed state; Figure 12 is a state diagram of the rotary valve core further rotating counterclockwise so that each of the two flow outlets 13 is communicated with one outlet 23. In Figure 11 , when the rotary valve core rotates counterclockwise by a certain angle, one of the two corresponding outlets 23 is in a semi-closed state; at this time, the two outlets 23 still output hydraulic oil; however, the semi-closed outlet 23 is also in a pressure relief state of relieving pressure through the pressure relief inlet 152 and the pressure relief outlet 151 of the pressure relief passage 15. At this time, further rotate the rotary valve core. When the semi-closed outlet 23 is completely closed, the hydraulic oil stored in the closed outlet 23 keeps relieving pressure through the pressure relief inlet 152 and the pressure relief outlet 151 of the pressure relief passage 15, and finally the hydraulic oil flows into the oil return port (not marked in the figure) provided on the valve body 2 through the pressure relief outlet 151. The advantage of designing the pressure relief passage 15 is that by adding the pressure relief passage 15, the pressure fluctuation generated during the process of the rotary valve core rotating to realize the oil circuit switching can be reduced, and further the pressure impact on external actuators such as the oil cylinder communicated with the outlet 23 can be reduced.

[0067] Specifically Figure 11 taking the flow outlet 13 on the upper right side of the drawing in Figure 11 as an example to deliver hydraulic oil to two adjacent outlets 23. As shown in Figure 6 and Figure 11 , Figure 6 and Figure 11 Figure 11 Figure 11 shows a schematic diagram of the rotary valve core further rotating counterclockwise so that one of the two outlets 23 communicated with the flow outlet 13 is in a semi-closed state; Figure 12 Figure 12 Figure 11 is a state diagram of the rotary valve core further rotating counterclockwise so that each of the two flow outlets 13 is communicated with one outlet 23. In Figure 11 , when the rotary valve core rotates counterclockwise by a certain angle, one of the two corresponding outlets 23 is in a semi-closed state; at this time, the two outlets 23 still output hydraulic oil; however, the semi-closed outlet 23 is also in a pressure relief state of relieving pressure through the pressure relief inlet 152 and the pressure relief outlet 151 of the pressure relief passage 15. At this time, further rotate the rotary valve core. When the semi-closed outlet 23 is completely closed, the hydraulic oil stored in the closed outlet 23 keeps relieving pressure through the pressure relief inlet 152 and the pressure relief outlet 151 of the pressure relief passage 15, and finally the hydraulic oil flows into the oil return port (not marked in the figure) provided on the valve body 2 through the pressure relief outlet 151. The advantage of designing the pressure relief passage 15 is that by adding the pressure relief passage 15, the pressure fluctuation generated during the process of the rotary valve core rotating to realize the oil circuit switching can be reduced, and further the pressure impact on external actuators such as the oil cylinder communicated with the outlet 23 can be reduced.

[0068] Furthermore, in order to improve the overall sealing performance of the rotary valve. As shown in Figure 2 Figure 2As shown in the figure, the rotary valve provided in this embodiment further includes a sealing assembly 3. The sealing assembly 3 includes a plurality of sealing rings, and the sealing rings are O-ring seals. The sealing assembly 3 is disposed in a sealing assembly groove (not labeled in the figure) opened on the valve body 2, and the sealing assembly 3 is sleeved on both ends of the rotary valve core to seal the gap between the outer peripheral walls of both ends of the rotary valve core passing through the mounting hole and the mounting hole.

[0069] In addition, similar to the existing rotary valve, the rotary valve of this embodiment further includes an end cover 4 and a pressing plate 5. The end cover 4 and the pressing plate 5 are respectively fixedly connected to the valve body 2. Among them, along the axial direction of the rotary body, the end cover 4 and the pressing plate 5 are located at both ends of the rotary body 1, and the end cover 4 and the pressing plate 5 function to limit the sealing ring in the sealing assembly groove.

[0070] Furthermore, as Figure 2 shown, the valve body 2 is further provided with a drainage and pressure increasing hole 25 that communicates the sealing assembly groove with the inlet 22. When the sealing assembly 3 is assembled in the sealing assembly groove, an annular accommodation groove 31 communicating with the drainage and pressure increasing hole 25 is opened at one end of the sealing assembly 3 along the axial direction of the mounting hole. The rotary valve core passes through the annular middle hole of the annular accommodation groove 31, and from the notch to the bottom of the annular accommodation groove 31, the groove width of the annular accommodation groove 31 gradually decreases. Specifically, the annular accommodation groove 31 is opened on the end face of one side of the sealing ring along its own axis. When the rotary valve works, high-pressure fluid (such as hydraulic pressure oil) can flow into the annular accommodation groove 31 of the sealing ring through the drainage and pressure increasing hole 25. Then, under the high pressure of the high-pressure fluid, one end of the annular accommodation groove 31 facing the drainage and pressure increasing hole 25 expands and swells, so that the sealing ring can better seal the gap between the outer peripheral walls of both ends of the rotary valve core passing through the mounting hole and the mounting hole.

[0071] Embodiment Two

[0072] This embodiment provides another rotary valve core and rotary valve, which also offsets the flow pressure along the radial direction of the rotary body 1 at the outlet 13 through the balance groove 14, thereby achieving the technical effects that the rotary valve core is not easily worn and stuck.

[0073] As Figures 13 - 14 shown, the difference between the rotary valve core and rotary valve in this embodiment and those in Embodiment One lies only in: the opening position of the annular groove 16, and other structures are exactly the same as those of the rotary valve core and rotary valve in Embodiment One. Specifically, in this embodiment, the annular groove 16 is circumferentially opened on the inner wall of the mounting hole of the valve body 2, and the annular groove 16 communicates the inlet 12 with the inlet 22 to balance the radial force of the rotary body 1 at the inlet 12. It can be imagined that in other embodiments, annular grooves 16 can also be respectively opened on the inner wall of the mounting hole of the valve body 2 and the side wall of the rotary body 1 of the rotary valve core, and the specific structure will not be elaborated here.

[0074] The above content is only a preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. The content of this specification should not be construed as a limitation on the present invention.

Claims

1. A rotary valve core, which is configured to be rotatably assembled in a valve body (2) of a rotary valve, is characterized in that, Comprising a rotary body (1), on which are provided: A diversion chamber (11), which is provided inside the rotary body (1); An inlet (12), which penetrates the outer peripheral wall of the rotary body (1) and is in communication with the diversion chamber (11); An outlet (13), which penetrates the outer peripheral wall of the rotary body (1) and is in communication with the diversion chamber (11), and the outlet (13) is arranged at an interval along the axial direction of the rotary body relative to the inlet (12); A balance groove (14), which is provided on the outer peripheral wall of the rotary body (1) facing away from the outlet (13) and is in communication with the diversion chamber (11) through a communication hole (17). When the rotary body (1) is in the diversion position inside the valve body (2), part of the fluid synchronously flows into the balance groove (14) in communication with the diversion chamber (11) through the diversion chamber (11), and the balance groove (14) is configured to reduce or offset the fluid pressure acting on the rotary body (1) in the radial direction of the rotary body at the balance groove (14) against the fluid pressure acting on the rotary body (1) in the radial direction of the rotary body at the outlet (13).

2. The rotary valve core according to claim 1, characterized in that, The rotary body (1) includes at least two balance grooves (14), two inlets (12), two diversion chambers (11) and two outlets (13). Each inlet (12) is sequentially in communication with one diversion chamber (11) and one outlet (13) to form two independent diversion channels, and each diversion chamber (11) is respectively in communication with at least one balance groove (14) to be used for reducing or offsetting the fluid pressure acting on the rotary body (1) in the radial direction of the rotary body at the two outlets (13).

3. The rotary valve core according to claim 2, wherein The two inlets (12) are arranged at an interval along the axial direction of the rotary body, the two outlets (13) are evenly arranged at an interval along the circumferential direction of the rotary body, and along the axial direction of the rotary body, at least one balance groove (14) is respectively arranged on both sides of each outlet (13).

4. The rotary valve core according to claim 1, wherein, The number of the balance grooves (14) provided on the outer peripheral wall of the rotary body (1) facing away from the outlet (13) is two, and the two balance grooves (14) are arranged at an interval along the axial direction of the rotary body on both sides of the outlet (13).

5. The rotary valve core according to claim 4, wherein The groove body of the balance groove (14) extends along the circumferential direction of the rotary body, and one end of one of the two balance grooves (14) provided on the outer peripheral wall of the rotary body (1) facing away from the outlet (13) along the circumferential direction of the rotary body and the other end of the other balance groove (14) along the circumferential direction of the rotary body are respectively in communication with the diversion chamber (11).

6. The rotary valve core according to any one of claims 1-5, characterized in that, The rotary body (1) is further provided with: A pressure relief passage (15) includes a pressure relief outlet (151) and a pressure relief inlet (152). The pressure relief outlet (151) is in communication with the pressure relief inlet (152), and the pressure relief inlet (152) is arranged at one side of the flow outlet (13) at intervals along the circumferential direction of the rotary body. The pressure relief outlet (151) penetrates through one end of the rotary body (1) along the axial direction of the rotary body.

7. A rotary valve, comprising a valve body (2), wherein the valve body (2) is provided with a mounting hole, an inlet (22) and an outlet (23) which respectively penetrate through the side wall of the valve body (2) and communicate with the mounting hole, and is characterized in that, It further includes a rotary valve core as described in any one of claims 1-6. The rotary valve core is rotatably disposed in the mounting hole. The inner wall of the mounting hole and the balance groove (14) define a receiving cavity for receiving fluid. The fluid inlet (12) is in communication with the guiding inlet (22), and the flow outlet (13) can be in communication with the guiding outlet (23).

8. The rotary valve according to claim 7, characterized in that, It further includes: An annular groove (16) is circumferentially formed on the outer peripheral wall of the rotary body (1) and / or the inner wall of the mounting hole. The annular groove (16) communicates the fluid inlet (12) with the guiding inlet (22) to balance the radial force on the rotary body (1) at the fluid inlet (12).

9. The rotary valve according to claim 8, characterized in that, The rotary valve further includes: A sealing assembly (3) is disposed in a sealing assembly groove formed on the valve body (2) and sleeved at both ends of the rotary valve core to seal the gap between the outer peripheral walls of both ends of the rotary valve core penetrating through the mounting hole and the mounting hole.

10. The rotary valve according to claim 9, wherein, A drainage and pressure increasing hole (25) communicating the sealing assembly groove with the guiding inlet (22) is further formed on the valve body (2). An annular receiving groove (31) communicating the drainage and pressure increasing hole (25) is formed at one end of the sealing assembly (3) along the axial direction of the mounting hole. From the notch to the bottom of the annular receiving groove (31), the groove width of the annular receiving groove (31) gradually decreases.

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