Proportional cartridge valve and hydraulic equipment

Abstract

The utility model discloses a proportional cartridge valve and hydraulic equipment, and relates to the technical field of hydraulic.The proportional cartridge valve comprises a valve element and a valve sleeve, the valve element is of a hollow structure with only one open end, and a plurality of throttling grooves are formed in the end of the valve element; in the length direction of the valve element, the width of the throttling groove is gradually reduced in the direction from the opening to the inner bottom wall; the valve sleeve is in clearance fit with the periphery of the valve element, a containing cavity is formed in the side wall between the valve sleeve and the valve element, a flow hole is formed in the side wall, opposite to the containing cavity, of the valve sleeve, an opening is formed in the end, close to the flow hole, of the valve sleeve, and the valve element can move in the length direction of the valve element. The flow hole is covered or exposed by the peripheral wall of the valve element, a small-opening-degree area, a middle-opening-degree area and a large-opening-degree area are formed, and the opening degree of the valve body in the small-opening-degree area and a flow characteristic curve are close to a first linearity. According to the technical scheme provided by the invention, precise control from micro flow to large flow can be provided, and meanwhile, the consistency of linearity and gain is kept.

Description

Technical Field

[0001] This application relates to the field of hydraulic technology, and particularly relates to a proportional cartridge valve and a hydraulic device. Background Art

[0002] With the development of industrial technology, large hydraulic presses such as forging presses, injection molding machines, and die-casting machines are increasingly used in China. Such machinery has the characteristics of high speed during no-load operation and low speed during heavy-load operation. Therefore, high requirements are imposed on the control components of the speed regulation system. The proportional throttle valve with an inserted structure (hereinafter referred to as the cartridge valve) has a flow capacity several times that of an ordinary proportional speed regulation valve, and has the advantages of simple structure, low cost, good dynamic and static characteristics, and high reliability, which is of great significance for realizing the smoothness and stepless speed regulation of the system.

[0003] The response time and flow rate of the cartridge valve determine the filling rate and speed of the propulsion cylinder during the die-casting process, and thus affect the service life of the propulsion cylinder. However, conventional cartridge valves are difficult to ensure flow linearity and stability in the small opening region, and cannot meet the usage requirements of hydraulic equipment. Summary of the Utility Model

[0004] The main purpose of this application is to propose a proportional cartridge valve and a hydraulic device, aiming to solve the problem that existing cartridge valves are difficult to balance flow gain and flow linearity.

[0005] To achieve the above object, the proportional cartridge valve proposed in this application includes:

[0006] A spool, the spool is a hollow structure with only one end open, and a plurality of throttle grooves are provided at the end of the spool; the opening width of the throttle groove is greater than the bottom wall width of the throttle groove;

[0007] A valve sleeve, the valve sleeve is in clearance fit with the outer periphery of the spool, and a cavity is provided on the side wall between the valve sleeve and the spool. A flow hole is provided on the side wall of the valve sleeve opposite to the cavity. An opening is provided at one end of the valve sleeve close to the flow hole. The spool can move along the length direction of the spool so that the outer peripheral wall of the spool covers or exposes the flow hole. During the process of the flow hole being exposed, a small opening region, a medium opening region, and a large opening region are formed. The opening degree and flow rate characteristic curve of the valve body in the small opening region are close to the first linearity.

[0008] In one embodiment, the side wall of the throttle groove is provided with a vertical section and an inclined section, the inclined section is located on the opening side of the throttle groove, and the inclined section forms an angle α with the bottom wall of the throttle groove.

[0009] In one embodiment, the value range of the angle α is greater than or equal to 35° and less than or equal to 55°; and / or,

[0010] The length of the inclined section is equal to the length of the vertical section.

[0011] In one embodiment, a plurality of the throttle grooves are uniformly distributed circumferentially along the end of the valve core, a plurality of the flow holes are uniformly distributed circumferentially along the valve sleeve, and the opening degree of the valve body in the medium opening degree region and the flow rate characteristic curve are close to the first linearity.

[0012] In one embodiment, M throttle grooves are uniformly arranged around the outer periphery of the valve core, N flow holes are uniformly arranged around the outer periphery of the valve sleeve to form a set of hole groups, and at least two sets of hole groups are arranged along the length direction of the valve sleeve; the flow holes of two adjacent sets of hole groups are arranged staggeredly, and M is greater than N.

[0013] In one embodiment, the outer peripheral circumference of the valve core is less than 2M times the bottom wall width of the throttle groove; and / or,

[0014] The flow hole is arranged as a kidney-shaped hole, and the kidney-shaped hole includes a rectangular portion and semi-circular portions on both sides of the rectangular portion; the overall length of the kidney-shaped hole is equal to the sum of twice the radius of the semi-circular portion and the width of the rectangular portion; the overall length of N kidney-shaped holes is less than the outer peripheral circumference of the valve sleeve.

[0015] In one embodiment, it further includes a valve cover, the valve cover is connected to one end of the valve sleeve, an installation cavity is formed inside the valve cover and the valve sleeve, and the valve core is arranged in the installation cavity; a rod body is arranged at one end of the valve core away from the throttle groove; an elastic member is arranged in the installation cavity, one end of the elastic member abuts against the inner wall of the installation cavity, and the other end of the elastic member abuts against the first limiting portion of the valve core.

[0016] In one embodiment, a first groove is arranged at one end of the valve core facing the valve cover, a rod body is connected to the bottom wall of the first groove, the elastic member is arranged in the first groove, and the rod body passes through the elastic member, and the first limiting portion is arranged at the bottom of the first groove;

[0017] and / or, the bottom wall of the first groove separates the first groove from the hollow structure of the valve core.

[0018] In one embodiment, a displacement sensor is arranged on the valve core, and the displacement sensor is used to obtain the movement state of the valve core; and / or,

[0019] The valve cover is provided with a first oil cavity and a second oil cavity, the valve core and the installation cavity respectively form a first closed area and a second closed area, the first oil cavity is communicated with the first closed area, and the second oil cavity is communicated with the second closed area.

[0020] The present application also proposes a hydraulic device, including the proportional cartridge valve as described above.

[0021] The technical solution of this application sets a number of throttling grooves at the end of the valve core, and at the same time sets a flow hole on the side wall of the end of the valve sleeve with an opening. By using the fact that the valve core can move along the length direction of the valve core, the outer peripheral wall of the valve core covers or exposes the flow hole to achieve the purpose of adjusting the fluid flow rate; among them, the fluid flows in from the opening below the valve core and then flows out through the flow hole; when the throttling groove of the valve core is located below the flow hole, at this time the outer peripheral wall of the valve core covers the flow hole, and the proportional cartridge valve is in the closed state; by moving the valve core upward along the length direction of the valve core, the flow hole is gradually exposed, and the flow hole serves as a channel for the fluid to flow out of the valve; when the throttling groove moves upward to be opposite to the position of the flow hole, the throttling groove is used to control the fluid flow rate; since the width of the throttling groove gradually decreases from the opening to the inner bottom wall direction, by moving the valve core upward, the flow hole is gradually exposed and the flow rate increases accordingly. The design of the throttling groove makes the increase of the flow rate in the small opening area have a linear characteristic. That is, when the exposure degree of the flow hole is small, the opening degree of the proportional cartridge valve is small, and the channel flow characteristic curve formed between the throttling groove and the flow hole rises gently approximately linearly, the flow gain is small and has good linearity, and high-precision linear control of small flow rates can be achieved; during the process of the valve core continuing to move upward, the blocked area of the flow hole of the proportional cartridge valve gradually decreases, the opening degree of the proportional cartridge valve gradually increases, the flow gain is large and has good linearity, and high-precision linear control of large flow rates can be achieved, thereby realizing the variable flow gain characteristic of the cartridge valve. The proportional cartridge valve can provide precise control from tiny flow rates to large flow rates while maintaining the consistency of linearity and gain. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0023] Figure 1 It is a schematic structural diagram of an embodiment of the proportional cartridge valve provided by the present application;

[0024] Figure 2 is Figure 1 the schematic cross-sectional structure at A-A in;

[0025] Figure 3 It is a schematic structural diagram of the closed state of an embodiment of the proportional cartridge valve provided by the present application;

[0026] Figure 4 It is a schematic structural diagram of the valve sleeve of an embodiment of the proportional cartridge valve provided by the present application;

[0027] Figure 5 isFigure 4 Schematic diagram of the sectional structure at B-B in [the figure];

[0028] Figure 6 is Figure 5 Partial enlarged view at C in [the figure];

[0029] Figure 7 Schematic diagram of the structure of the spool of an embodiment of the proportional cartridge valve provided by the present application;

[0030] Figure 8 is Figure 7 Schematic diagram of the sectional structure at D-D in [the figure];

[0031] Figure 9 is Figure 8 Partial enlarged view at E in [the figure];

[0032] Figure 10 Schematic diagram of the proportional cartridge valve opening degree and flow rate characteristic curve provided by the present application.

[0033] Explanation of the reference numerals in the attached drawings: 1. Spool; 11. Throttle groove; 111. Vertical section; 112. Inclined section; 12. First limit part; 13. First groove; 14. Rod body; 2. Valve sleeve; 21. Flow hole; 22. Opening; 3. Valve cover; 31. First oil chamber; 32. Second oil chamber; 4. Elastic part; 5. Displacement sensor.

[0034] The realization of the purpose, functional features and advantages of the present application will be further described in conjunction with the embodiments with reference to the attached drawings. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the attached drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0036] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present application, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0037] In addition, if the descriptions such as "first" and "second" are involved in the embodiments of this application, the descriptions of "first", "second", etc. are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on what can be achieved by those of ordinary skill in the art. When the combination of technical solutions results in contradictions or cannot be achieved, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0038] The small opening region of the valve body refers to the valve body opening within 20%, the medium opening region refers to the valve body opening between 20% - 70%, and the large opening region refers to the valve body opening between 70% - 100%.

[0039] The opening degree and the flow rate characteristic curve being close to the first linearity means that without the premise of auxiliary tools, the curve can be visually approximated as a straight line by the naked eye, and each point on the curve is on the straight line or distributed on both sides close to the straight line; being close means that the error between the opening degree of the valve body and the first linearity of the flow rate characteristic curve does not exceed 8%.

[0040] This application proposes a proportional cartridge valve.

[0041] Please refer to Figures 1 to 10 , in an embodiment of this application, the proportional cartridge valve includes a valve core 1 and a valve sleeve 2. The valve core 1 is a hollow structure with only one end open, and several throttle grooves 11 are provided at the end of the valve core 1; the width of the opening 22 of the throttle groove 11 is greater than the width of the bottom wall of the throttle groove 11; and a cavity is provided on the side wall between the valve sleeve 2 and the valve core 1, a flow hole 21 is provided on the side wall of the valve sleeve 2 and the cavity, an opening 22 is provided at one end of the valve sleeve 2 where the flow hole 21 is provided, and the valve core 1 can move along the length direction of the valve core 1 so that the outer peripheral wall of the valve core 1 covers or exposes the flow hole 21. During the process of the flow hole 21 being exposed, a small opening region, a medium opening region, and a large opening region are formed, and the opening degree of the valve body in the small opening region is close to the first linearity of the flow rate characteristic curve.

[0042] In the above structure, by providing a plurality of throttle grooves 11 at the end of the valve core 1 and arranging a flow hole 21 on the side wall of one end of the valve sleeve 2 provided with an opening 22, and using the fact that the valve core 1 can move along the length direction of the valve core 1, so that the outer peripheral wall of the valve core 1 covers or exposes the flow hole 21, the purpose of adjusting the fluid flow rate is achieved; wherein, the fluid flows in from the opening 22 below the valve core 1 and then flows out through the flow hole 21; when the throttle groove 11 of the valve core 1 is located below the flow hole 21, at this time the outer peripheral wall of the valve core 1 covers the flow hole 21, and the proportional cartridge valve is in a closed state; by moving the valve core 1 upward along the length direction of the valve core 1, the flow hole 21 is gradually exposed, and the flow hole 21 serves as a channel for the fluid to flow out of the valve; when the throttle groove 11 moves upward to a position opposite to the flow hole 21, the throttle groove 11 is used to control the fluid flow rate; since the width of the throttle groove 11 gradually decreases from the opening 22 to the inner bottom wall direction, by moving the valve core 1 upward, the flow hole 21 is gradually exposed and the flow rate increases accordingly. The design of the throttle groove 11 makes the increase in the flow rate have a linear characteristic. That is, when the exposure degree of the flow hole 21 is small, the opening amount of the proportional cartridge valve at the opening 22 is small, and the channel flow characteristic curve formed between the throttle groove 11 and the flow hole 21 rises gently approximately in a straight line, with a small flow gain and good linearity, and high-precision linear control of small flow rates can be achieved; during the process of the valve core 1 continuing to move upward, the blocked area of the flow hole 21 of the proportional cartridge valve gradually decreases, the opening amount of the proportional cartridge valve at the opening 22 gradually increases, the flow gain is large and has good linearity, and high-precision linear control of large flow rates can be achieved, thereby realizing the variable flow gain characteristic of the cartridge valve. The proportional cartridge valve can provide precise control from a very small flow rate to a large flow rate while maintaining the consistency of linearity and gain. It should be noted that the valve body opening refers to the area size of the exposed flow hole.

[0043] In an embodiment, the side wall of the throttle groove 11 is provided with a vertical section 111 and an inclined section 112. The inclined section 112 is located on the opening 22 side of the throttle groove 11, and the inclined section 112 forms an angle α with the bottom wall of the throttle groove 11. The vertical section 111 is a part of the side wall of the throttle groove 11 and is perpendicular to the bottom wall of the throttle groove 11. The inclined section 112 forms an angle α with the bottom wall of the throttle groove 11; wherein the inclined section 112 is located on the opening 22 side of the throttle groove 11, and the inclined section 112 is used to provide a guiding effect for the fluid to enter the throttle groove 11, reduce turbulence and pressure loss, and at the same time increase the opening width of the throttle groove 11, reduce the air flow disturbance generated by the fluid and improve the linearity of the flow rate. Adding the inclined section 112 helps to improve the hydrodynamic characteristics, reduce the energy loss of the fluid during the throttling process, and at the same time improve the response speed and control accuracy of the proportional cartridge valve.

[0044] In one embodiment, the included angle α ranges from greater than or equal to 35° and less than or equal to 55°. The smaller the included angle α, the faster the fluid flow rate; the larger the included angle α, the slower the fluid flow rate. Controlling the included angle α within the range of greater than or equal to 35° and less than or equal to 55° can provide better flow linearity, that is, the change in the fluid flow rate is proportional to the movement of the spool 1. The size of the included angle α also affects the pressure loss when the fluid passes through the throttle groove 11. The smaller the included angle α, the greater the pressure loss; the larger the included angle α, the smaller the pressure loss. However, if the included angle α is too large, it is likely to affect the flow linearity of the throttle groove 11. Therefore, controlling the included angle α within the range of greater than or equal to 35° and less than or equal to 55° can reduce the pressure loss while ensuring that the proportional cartridge valve has good flow linearity. In addition, when the included angle α is less than 30°, it may cause turbulence when the fluid passes through the throttle groove 11, while an included angle α of 35° - 55° helps to maintain the laminar flow state of the fluid, reduce turbulence and related energy consumption, and at the same time ensure that the proportional cartridge valve has good flow linearity. Specifically, the included angle α can be set to 45°.

[0045] In one embodiment, the length a of the inclined section 112 is equal to the length b of the vertical section 111. The equality of the length a of the inclined section 112 and the length b of the vertical section 111 makes the path lengths of the fluid passing through the throttle groove 11 equal, which helps to achieve more consistent flow control; the equal-length inclined section 112 and vertical section 111 make the pressure distribution of the fluid in the throttle groove 11 more uniform, which helps to reduce local pressure loss and reduce the turbulence of the fluid in the throttle groove 11, thereby improving the flow stability and control accuracy. When the spool 1 moves, the change in the opening area 22 of the throttle groove 11 and the linearity of the fluid channel formed with the liquid outlet are better, which helps to achieve more accurate flow regulation.

[0046] In one embodiment, a plurality of throttle grooves 11 are evenly distributed circumferentially along the end of the valve core 1, and a plurality of flow holes 21 are evenly distributed circumferentially along the valve sleeve 2. Moreover, the opening degree and flow rate characteristic curve of the valve body 1 in the medium opening region are close to the first linearity. The throttle grooves 11 evenly distributed circumferentially contribute to achieving uniform fluid distribution around the valve core 1, thereby reducing local pressure differences and possible flow non-uniformities, and can provide more consistent flow control because the resistance of each throttle groove 11 to the fluid is similar, which helps to achieve more precise flow regulation. Also, since the acting force of the fluid on the valve core 1 is more uniform circumferentially, the stability of the valve during operation can be improved. At the same time, the evenly distributed throttle grooves 11 help to optimize the hydrodynamic characteristics, such as reducing fluid turbulence and increasing the laminarity of the fluid. Meanwhile, a plurality of flow holes 21 are evenly distributed circumferentially along the valve sleeve 2. Similarly, the circumferential uniform distribution of the flow holes 21 helps to achieve more uniform distribution of the fluid when flowing out of the proportional cartridge valve, reduces the over-concentration of the fluid in certain areas, and at the same time helps to reduce the local pressure unevenness caused by fluid flow, thereby improving the stability and reliability of the valve. The uniform distribution of the flow holes 21 can also provide a more consistent flow output, which helps to achieve more precise flow control. The cooperation of the uniform distribution of the flow holes 21 and the evenly distributed throttle grooves 11 helps to improve the fluid flow efficiency of the entire proportional cartridge valve and reduces the loss of fluid flow energy. Thus, the opening degree and flow rate characteristic curve of the valve body in the medium opening region are close to the first linearity.

[0047] In one embodiment, M throttle grooves 11 are evenly arranged around the outer periphery of the valve core 1, and N flow holes 21 are evenly arranged around the outer periphery of the valve sleeve 2 and form a set of hole groups. The valve sleeve 2 is arranged with at least two sets of hole groups along the length direction; the flow holes 21 of adjacent two sets of hole groups are arranged staggeredly. By arranging at least two sets of flow hole 21 groups on the valve sleeve 2, multi-stage flow control can be achieved, and each set of hole groups can correspond to different flow levels. The staggered arrangement of the flow holes 21 of adjacent hole groups helps to achieve a smoother flow transition between different hole groups, reduces the sudden changes in fluid flow, and improves the linearity of the flow rate. The flow holes 21 evenly arranged along the circumference of the valve sleeve 2 help to achieve uniform distribution when the fluid flows out, and improve the flow control accuracy of the entire valve. The staggered layout of the flow holes 21 helps to optimize the hydrodynamic characteristics, reduces the formation of turbulence and eddies, and improves the efficiency of fluid flow. Among them, M and N are positive integers greater than zero, and M is greater than N, that is, the number of throttle grooves 11 is greater than the number of flow holes 21.

[0048] In one embodiment, the outer peripheral circumference 2πRx of the valve core 1 is less than 2M times the bottom wall width c of the throttle groove 11. By controlling the bottom wall width of the throttle groove 11, the structural strength of the valve core 1 is ensured, and the valve core 1 is prevented from deforming or being damaged under the action of fluid pressure. Among them, M is the number of throttle grooves 11, which is a positive integer greater than zero, and Rx is the radius of the valve core.

[0049] In one embodiment, the flow hole 21 is arranged as a waist-shaped hole, and the waist-shaped hole includes a rectangular portion and semi-circular portions on both sides of the rectangular portion; the overall length of the waist-shaped hole is equal to the sum of twice the radius of the semi-circular portion and the width of the rectangular portion; the overall length 2r + e of the N waist-shaped holes is less than the outer peripheral circumference 2πRy of the valve sleeve 2. The semi-circular portions of the waist-shaped hole can reduce turbulence and eddy currents when the fluid passes through, thereby reducing pressure loss; the combination of the rectangular portion and the semi-circular portions provides good structural stability and helps to withstand the fluid pressure. By making the total length of the waist-shaped hole not exceed the outer peripheral circumference of the valve sleeve 2, the installation space of the valve sleeve 2 can be utilized more effectively; at the same flow rate, the opening area of the waist-shaped hole is the smallest, and the flow linearity of the proportional cartridge valve can be made smoother. Wherein, r is the radius of the semi-circular portion, e is the width of the rectangular portion, d is the diameter of the semi-circular portion and also the length of the rectangle; Ry is the radius of the valve core.

[0050] In one embodiment, the proportional cartridge valve further includes a valve cover 3. The valve cover 3 is connected to one end of the valve sleeve 2. An installation cavity is formed inside the valve cover 3 and the valve sleeve 2, and the valve core 1 is arranged in the installation cavity; a rod body 14 is provided at one end of the valve core 1 away from the throttle groove 11; an elastic member 4 is arranged in the installation cavity. One end of the elastic member 4 abuts against the inner wall of the installation cavity, and the other end of the elastic member 4 abuts against the first limiting portion 12 of the valve core 1. The connection between the valve cover 3 and one end of the valve sleeve 2 serves to seal and fix, and at the same time forms an installation cavity with the inside of the valve sleeve 2. The valve core 1 is a key component for controlling the fluid flow and is arranged in the installation cavity. A rod body 14 is provided at one end of the valve core 1 away from the throttle groove 11, and an elastic member 4 is arranged in the installation cavity to provide a restoring force or a holding force for the valve core 1 by means of the elastic member 4. One end of the elastic member 4 abuts against the inner wall of the installation cavity, and the other end abuts against the first limiting portion 12 of the valve core 1 to ensure that the valve core 1 can be maintained at a preset position when there is no external force acting. Wherein, the elastic member 4 can adopt a spring. When the spring is in a compressed state, the proportional cartridge valve can be kept in a closed state; and the spring remains in a compressed state during the operation of the proportional cartridge valve, playing a role in stabilizing the valve core 1 and reducing vibration.

[0051] In one embodiment, one end of the valve core 1 facing the valve cover 3 is provided with a first groove 13. A rod body 14 is connected to the bottom wall of the first groove 13. The elastic member 4 is disposed in the first groove 13, and the rod body 14 passes through the elastic member 4. A first limiting portion 12 is provided at the bottom of the first groove 13, and the bottom wall of the first groove 13 separates the first groove 13 from the hollow structure of the valve core 1. The rod body 14 passes through the elastic member 4, and the elastic member 4 is in a compressed state, which can keep the cartridge valve closed. At the same time, when the valve body moves upward, it can play a role in stabilizing the valve core 1 and reducing vibration. The rod body 14 passes through the elastic member 4. When a force acts on the valve core 1, the elastic member 4 can be compressed or stretched, so as to realize the control of the position of the valve core 1. The first limiting portion 12 at the bottom of the first groove 13 is used to abut against one end of the elastic member 4, ensuring that the valve core 1 can be affected by the elastic member 4 when moving, and restricting the moving range of the valve core 1. The valve cover 3 is provided with a second groove, and a second limiting portion 33 is provided on the top wall of the second groove. The first limiting portion 12 and the second limiting portion 33 respectively abut against both ends of the elastic member 4 for installing the elastic member 4. Among them, the first limiting portion 12 and the second limiting portion 33 are arranged as a groove structure.

[0052] In one embodiment, the valve cover 3 and the valve core 1 are threadedly connected by fasteners. Threaded connection can provide a stable connection, ensuring that the relative positions of the valve cover 3 and the valve core 1 remain unchanged during operation. Threaded connection allows for the quick disassembly and reassembly of the valve cover 3 and the valve core 1, facilitating maintenance and component replacement. Additionally, a sealing structure can be provided at the connection between the valve cover 3 and the valve core 1. The sealing structure includes a sealing gasket or sealant to improve the sealing performance between the valve cover 3 and the valve core 1 and prevent fluid leakage. Among them, the threaded connection can be made using bolts or screws.

[0053] In one embodiment, a displacement sensor 5 is provided on the valve core 1. The displacement sensor 5 is used to obtain the moving state of the valve core 1. By obtaining the displacement data of the valve core 1 through the displacement sensor 5, feedback can be realized based on the displacement data of the valve core 1, improving the control accuracy of controlling the movement of the valve core 1, and further realizing the precise regulation of the flow rate.

[0054] In one embodiment, the valve cover 3 is provided with a first oil chamber 31 and a second oil chamber 32. The valve core 1 and the installation chamber respectively form a first closed area and a second closed area. The first oil chamber 31 communicates with the first closed area, and the second oil chamber 32 communicates with the second closed area. By controlling the oil fluid introduced into the first oil chamber 31 or the second oil chamber 32, the pressure difference of the oil fluid in the first closed area or the second closed area is changed to push the valve core 1 to move up and down. Specifically, the displacement sensor 5 is electrically connected to the controller. The inlet of the first oil chamber 31 is provided with a first control valve, and the inlet of the second oil chamber 32 is provided with a second control valve. The first control valve and the second control valve are connected to the controller. The controller is used to control the oil fluid introduced through the first control valve and the second control valve according to the displacement data of the displacement sensor 5 to adjust the moving position of the valve core 1. When oil fluid flows into the first oil chamber 31, the valve core 1 moves upward, and the proportional cartridge valve opens; when oil fluid flows into the second oil chamber 32, the valve core 1 moves downward, and the proportional cartridge valve closes. At the same time, by using the abutment of the elastic member 4 and the valve core 1, the valve core 1 is kept in the closed state.

[0055] The technical solution of the present application realizes the purpose of adjusting the fluid flow rate by arranging a plurality of throttling grooves 11 at the end of the valve core 1 and arranging a flow hole 21 on the side wall of one end of the valve sleeve 2 where the opening 22 is provided. The valve core 1 can move along the length direction of the valve core 1 so that the outer peripheral wall of the valve core 1 covers or exposes the flow hole 21. Among them, the fluid flows in from the opening 22 below the valve core 1 and then flows out through the flow hole 21. When the throttling groove 11 of the valve core 1 is located below the flow hole 21, at this time, the outer peripheral wall of the valve core 1 covers the flow hole 21, and the proportional cartridge valve is in the closed state. By moving the valve core 1 upward along the length direction of the valve core 1, the flow hole 21 is gradually exposed, and the flow hole 21 serves as a channel for the fluid to flow out of the valve. When the throttling groove 11 moves upward to a position opposite to the flow hole 21, the throttling groove 11 is used to control the fluid flow rate. Since the width of the throttling groove 11 gradually decreases from the opening 22 to the inner bottom wall direction, by moving the valve core 1 upward, the flow hole 21 is gradually exposed, and the flow rate increases accordingly. The design of the throttling groove 11 makes the increase in the flow rate have a linear characteristic. That is, when the exposure degree of the flow hole 21 is small, in the small opening area of the proportional cartridge valve, the opening degree and flow rate characteristic curve formed between the throttling groove 11 and the flow hole 21 approximately rises linearly and gently, the flow rate gain is small and has good linearity, and high-precision linear control of small flow rates can be achieved. During the process of the valve core 1 continuing to move upward, the blocked area of the flow hole 21 of the proportional cartridge valve gradually decreases, and the opening amount of the opening 22 of the proportional cartridge valve gradually increases. The flow rate gain is large and has good linearity, and high-precision linear control of large flow rates can be achieved, thereby realizing the variable flow rate gain characteristic of the cartridge valve. The proportional cartridge valve can provide precise control from a very small flow rate to a large flow rate while maintaining the consistency of linearity and gain.

[0056] The present application also provides a hydraulic device, which includes a proportional cartridge valve. The specific structure of the proportional cartridge valve refers to the above embodiments. Since this hydraulic device adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated herein one by one.

[0057] Among them, the hydraulic device can be a large hydraulic device such as a die-casting machine, a forging press, or an injection molding machine.

[0058] The above description is only an exemplary embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structural transformation made under the technical concept of the present application by using the content of the specification and drawings of the present application, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. A proportional cartridge valve, characterized in that, Comprising: A valve core, the valve core being a hollow structure with only one end open, and a plurality of throttling grooves being provided at the end of the valve core; The opening width of the throttling groove is greater than the bottom wall width of the throttling groove; A valve sleeve, the valve sleeve being in clearance fit with the outer periphery of the valve core, and a cavity being provided on the side wall between the valve sleeve and the valve core, a flow hole being provided on the side wall of the valve sleeve opposite to the cavity, an opening being provided at one end of the valve sleeve close to the flow hole, and the valve core being movable along the length direction of the valve core so that the outer peripheral wall of the valve core covers or exposes the flow hole, and a small opening region, a medium opening region and a large opening region being formed during the exposure of the flow hole, and the opening degree of the valve body in the small opening region being close to the first linearity of the flow rate characteristic curve.

2. The proportional cartridge valve according to claim 1, wherein The side wall of the throttling groove is provided with a vertical section and an inclined section, the inclined section being located on the opening side of the throttling groove, and the inclined section forming an included angle α with the bottom wall of the throttling groove.

3. The proportional cartridge valve according to claim 2, characterized in that, The value range of the included angle α is greater than or equal to 35° and less than or equal to 55°; and / or, The length of the inclined section is equal to the length of the vertical section.

4. The proportional cartridge valve according to claim 1, characterized in that A plurality of the throttling grooves are evenly distributed circumferentially at the end of the valve core, a plurality of the flow holes are evenly distributed circumferentially on the valve sleeve, and the opening degree of the valve body in the medium opening region is close to the first linearity of the flow rate characteristic curve.

5. The proportional cartridge valve according to claim 1, characterized in that, M throttling grooves are uniformly arranged around the outer periphery of the valve core, N flow holes are uniformly arranged around the outer periphery of the valve sleeve to form a set of hole groups, and at least two sets of hole groups are arranged along the length direction of the valve sleeve; the flow holes between adjacent two sets of hole groups are staggered, and M is greater than N.

6. The proportional cartridge valve according to claim 1, characterized in that, The outer peripheral circumference of the valve core is less than 2M times the bottom wall width of the throttling groove; and / or, The flow hole is provided as a waist-shaped hole, the waist-shaped hole including a rectangular portion and semi-circular portions on both sides of the rectangular portion; the overall length of the waist-shaped hole is equal to the sum of the radius of the two semi-circular portions and the width of the rectangular portion; the overall length of N waist-shaped holes is less than the outer peripheral circumference of the valve sleeve.

7. The proportional cartridge valve according to any one of claims 1 to 6, characterized in that, It further includes a valve cover, the valve cover being connected to one end of the valve sleeve, an installation cavity being formed inside the valve cover and the valve sleeve, and the valve core being arranged in the installation cavity; an elastic member is arranged in the installation cavity, one end of the elastic member being abutted against the inner wall of the installation cavity, and the other end of the elastic member being abutted against the first limiting portion of the valve core.

8. The proportional cartridge valve according to claim 7, wherein, One end of the valve core facing the valve cover is provided with a first groove, a rod body being connected to the bottom wall of the first groove, the elastic member being arranged in the first groove, and the rod body passing through the elastic member, and the first limiting portion being provided at the bottom of the first groove; and / or, the bottom wall of the first groove separates the first groove from the hollow structure of the valve core.

9. The proportional cartridge valve according to claim 7, characterized in that, A displacement sensor is arranged on the valve core, and the displacement sensor is used to obtain the movement state of the valve core; and / or, The valve cover is provided with a first oil chamber and a second oil chamber, the valve core and the installation cavity respectively form a first closed region and a second closed region, the first oil chamber is communicated with the first closed region, and the second oil chamber is communicated with the second closed region.

10. A hydraulic device, characterized in that, Comprising the proportional cartridge valve according to any one of claims 1 to 9.

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