A structure of a pure water or high water-based hydraulic proportional reversing valve for engineering machinery

Abstract

The utility model discloses a kind of hydraulic proportional reversing valve structures of engineering machinery pure water or high water-based medium, the structure improvement of reversing valve spool is carried out, use electric push rod (it can also be called push rod motor, linear push rod motor, electric cylinder, electric cylinder etc., following collectively as electric push rod) as the driving component of reversing valve, push rod is connected and drives reversing valve spool to produce action, the rotary motion of motor is converted into the linear motion of valve core.Valve core transition area in the connecting part of valve core convex shoulder and recess during valve core movement, the different corresponding relationship of valve port flow area with valve core displacement is presented.When the transition area of valve core is inclined angle structure, the proportional change of valve port flow area with valve core displacement can be realized.The utility model can realize the application of pure water or high water-based hydraulic proportional reversing valve in engineering machinery, reduce the cost of engineering machinery proportional reversing valve, with broad application prospect.

Description

Technical Field

[0001] This utility model belongs to the field of pure water or high water-based hydraulic proportional directional valves, and relates to the structure of pure water or high water-based hydraulic proportional directional valves for engineering machinery. Background Technology

[0002] In the field of fluid transmission, water hydraulics technology is a promising research area. Compared to the environmentally harmful effects of leakage from traditional oil-based systems, water hydraulics technology is more environmentally friendly due to its cleanliness and flame-retardant properties. However, using water as a transmission medium currently presents some challenges. The main issue is that water's viscosity is lower than that of oil, making it difficult to ensure the sealing performance of water hydraulic components and easily leading to gap leakage. Furthermore, water's low viscosity and low lubricity can corrode materials, causing hydraulic component failure.

[0003] In recent years, with the research and development in engineering materials, lubrication theory, and advanced manufacturing, some difficulties in hydraulic transmission technology have been overcome. For example, utility model patent CN215444565U, "A Spool-Type Hydraulic Directional Control Valve with a Special Sealing Valve Core Structure," discloses a spool-type directional control valve structure suitable for high-pressure, high-flow-rate pure water or high-water-based media. A special sealing ring improves the sealing reliability of the pure water or high-water-based spool-type directional control valve. This structure uses an electro-hydraulic control method to realize the switching of the pure water or high-water-based spool-type directional control valve. However, because the flow rate cannot be adjusted, the hydraulic cylinder cannot be precisely positioned, limiting the application range of the pure water or high-water-based spool-type directional control valve.

[0004] Based on the problems existing in the practical application of pure water or high water-based spool-type directional control valves, it is necessary to explore the proportional switching of pure water or high water-based spool-type directional control valves. Currently, the control method for hydraulic spool-type proportional directional control valves in engineering machinery typically involves proportional electromagnets. Proportional electromagnets can adjust the position of the valve core according to the input electrical signal, thereby controlling the flow rate and direction of the fluid, and are widely used in hydraulic proportional directional control valves. However, for the above-mentioned directional control valve structure, the proportional electromagnet cannot be directly used as the driving component of the valve core. The main reason is that the presence of the sealing ring in this directional control valve structure increases the resistance to the movement of the valve core, and the limited thrust of the electromagnet cannot counteract this resistance. Therefore, it is necessary to explore a pure water or high water-based hydraulic proportional directional control valve structure suitable for engineering machinery. Utility Model Content

[0005] To address the above problems, this invention improves the structure of the directional control valve core and uses an electric push rod as the driving component. This structure enables proportional switching of pure water or high water-based hydraulic directional control valves in engineering machinery, reducing operating costs and meeting the needs of different working conditions.

[0006] The technical solution of this utility model is as follows:

[0007] A hydraulic proportional directional valve structure for engineering machinery, using pure water or high water-based fluids, mainly includes a directional valve body and a drive unit. The directional valve body comprises a left valve cover, a valve body, a valve core, and a right valve cover. The valve body contains a valve cavity and inlet / outlet flow holes. The valve core is coaxially mounted within the valve cavity inside the valve body. Transition areas can be machined onto both the valve core and the valve body. The flow area formed between the valve core and the valve body flow holes during valve core movement is called the valve port. The valve port opening is changed by altering the valve core displacement, and the relationship between the flow area of ​​the valve port and the valve core displacement is changed by altering the shape and size of the transition area. The drive unit is an electric actuator, installed on either the left or right side of the directional valve body. The actuator achieves linear motion under motor control. The electric actuator is not limited to any actuator capable of linear motion, including motor actuators, electromagnet actuators, hydraulic actuators, etc.

[0008] Specifically, the valve core is a rotating structure, comprising a shoulder and a groove, with the part where the shoulder and groove connect being called the transition area.

[0009] Specifically, the part where the flow passage inside the valve body connects to the valve cavity is called the valve cavity transition area.

[0010] Specifically, the electric push rod is connected to the valve core, driving the valve core to perform linear reciprocating motion within the valve cavity.

[0011] Specifically, the valve core transition area includes any combination of circular arc structure, oblique angle structure, and right angle structure, wherein the oblique angle structure is an inclined transition with a slope of k (|k|≠0), and the right angle structure is a vertical transition perpendicular to the valve core axis.

[0012] Specifically, by setting the number and size of the valve core shoulders, the neutral position function of the valve core can be Y-type, H-type, O-type, P-type, etc.

[0013] Specifically, the valve cavity transition region includes any combination of valve cavity right-angle structure, valve cavity oblique-angle structure, and valve cavity arc structure, wherein the valve cavity right-angle structure is a vertical transition perpendicular to the valve cavity axis, and the valve cavity oblique-angle structure is an inclined transition with a slope of k (|k|≠0).

[0014] Specifically, the oblique structure in the valve core transition region or valve cavity transition region can be replaced with a wave-shaped structure or a stepped structure to form a wave-shaped transition region or a stepped transition region, as well as other structures based on different effects.

[0015] Specifically, the angled structure in the valve core transition region can also be replaced with a wave-shaped structure or a stepped structure to form a wave-shaped valve core transition region or a stepped valve core transition region, as well as other structures based on different effects.

[0016] Specifically, when the valve core is in the neutral position, under the action of the outer circle generatrix of the valve core shoulder and the sealing element, the liquid inlet of the valve body is not connected to any working port, and the reversing valve is in the closed state at this time.

[0017] Specifically, when the electric actuator is activated, it drives the directional valve spool to begin moving. After the directional valve opens, based on the different shapes and sizes of the spool transition area and the valve cavity transition area, the valve opening degree can exhibit different trends with the spool displacement (e.g., ...). Figure 19 , 20 (As shown in Figure 21).

[0018] Specifically, the proportional valve structure can be applied to a two-position two-way proportional directional valve structure, a two-position three-way proportional directional valve structure, a two-position four-way proportional directional valve structure, a three-position four-way proportional directional valve structure, etc.

[0019] The beneficial effects of this utility model's technical solution are as follows:

[0020] It can realize the proportional switching of water-based reversing valves for engineering machinery. The use of pure water or high water-based media can reduce the operating cost of engineering machinery. In extreme cases where the working medium leaks, it is more environmentally friendly and meets the requirements of environmental protection and green and sustainable development. Attached Figure Description

[0021] Figure 1 , Figure 2 , Figure 3 This is a schematic diagram of the assembly of the electric push rod and the directional valve body. In the diagram, 2, 3, 4, and 5 constitute the directional valve body.

[0022] Figure 4 This is the structure of the directional valve core;

[0023] Figure 5 This refers to the structure of the directional valve body;

[0024] Figures 6 to 11 For any combination of the transition structure of the directional valve core;

[0025] Figure 12 This refers to the positional relationship between the valve core and the valve body inlet and working port when the valve core is in the neutral position, i.e., x = 0.

[0026] Figure 13 This refers to the positional relationship between the valve core and the valve body inlet and working port when the valve core is in the right position, i.e., x > 0.

[0027] Figure 14 This refers to the positional relationship between the valve core and the valve body inlet and working port when the valve core is in the left position, i.e., x < 0.

[0028] Figure 15A schematic diagram showing the positional relationship between the valve core and the valve body when the valve core transition area is an angled structure combined with other structures.

[0029] Figure 16 A schematic diagram showing the positional relationship between the valve core and the valve body when the valve core transition area has a wavy structure and is combined with other structures.

[0030] Figure 17 A schematic diagram showing the positional relationship between the valve core and the valve body when the valve core transition area has a stepped structure and is combined with other structures.

[0031] Figure 18 A schematic diagram showing the positional relationship between the valve core and the valve body when the valve cavity transition area is a valve cavity oblique structure combined with other structures;

[0032] Figure 19 When the transition area of ​​the valve core or the transition area of ​​the valve cavity is an oblique structure combined with other structures, the curve of the flow area S of the reversing valve changes with the displacement x of the valve core (the positive and negative signs of the flow area S in the figure only represent the flow direction, not the size. When the flow area S is positive, it means that the liquid flows from port P to port B. When the flow area S is negative, it means that the liquid flows from port P to port A. The same applies below).

[0033] Figure 20 The transition area of ​​the valve core or the transition area of ​​the valve cavity is a wavy structure combined with other structures. The curve of the flow area S of the reversing valve as a function of the valve core displacement x is shown.

[0034] Figure 21 The curve showing the change of the flow area S of the directional valve with the valve core displacement x when the transition area of ​​the valve core or the transition area of ​​the valve cavity is a stepped structure combined with other structures.

[0035] In the picture:

[0036] 1. Electric linear actuator;

[0037] 2. Left valve cover;

[0038] 3. Valve body;

[0039] 4. Valve core;

[0040] 5. Right side valve cover;

[0041] 6. Valve core shoulder;

[0042] 7. Valve core groove;

[0043] 8. Valve core transition area;

[0044] 8-1 Circular arc structure, 8-2 Oblique angle structure, 8-3 Right angle structure;

[0045] 9. Wave-shaped valve core transition area;

[0046] 10-step valve core transition area;

[0047] 11. Valve cavity transition area;

[0048] 11-1 Right-angle transition structure for valve cavity, 11-2 Oblique transition structure for valve cavity, 11-3 Circular arc transition structure for valve cavity. Detailed Implementation

[0049] The embodiments of this application will now be described in more detail with reference to the accompanying drawings.

[0050] Example 1: The transition area of ​​the valve core is any combination of an angled structure and other structures.

[0051] A hydraulic proportional directional valve structure for engineering machinery using pure water or high water-based fluids mainly includes a directional valve body and a drive unit. The directional valve body comprises a left valve cover (2), a valve body (3), a valve core (4), and a right valve cover (5). The valve body contains a valve cavity (3-1) and inlet / outlet flow holes. The valve core (4) is coaxially mounted in the valve cavity (3-1) inside the valve body. A transition area is machined on the valve core. The flow area formed between the valve core and the valve body flow holes during valve core movement is called the valve port. The valve port opening is changed by altering the valve core displacement, and the relationship between the flow area of ​​the valve port and the valve core displacement is changed by altering the shape and size of the transition area. The drive unit is an electric push rod (1), which is installed on either the left or right side of the directional valve body. The push rod achieves linear movement under motor control.

[0052] The valve core (4) is a rotating structure, comprising a shoulder (6) and a groove (7). The part where the shoulder (6) and the groove (7) connect is called the valve core transition area (8) (see [reference]). Figure 15 ).

[0053] Specifically, the electric push rod (1) is connected to the valve core (4) and drives the valve core to make linear reciprocating motion in the valve cavity.

[0054] Specifically, the valve core transition region (8) includes any combination of arc structure (8-1), oblique structure (8-2), and right-angle structure (8-3), and can be specifically formed as follows: Figures 4 to 9 The combination forms shown are as follows. Among them, the oblique structure (8-2) is an inclined transition with a slope of k (|k|≠0), and the right-angle structure (8-3) is a vertical transition perpendicular to the valve core axis.

[0055] For details, see Figure 15When the valve core is in the neutral position, under the action of the outer circle generatrix of the valve core shoulder and the sealing element, the valve body inlet is not connected to either working port, and the directional valve is in the closed state. When the electric push rod is activated, the valve core is driven to move to the right until the inlet P is connected to the working port B, and the liquid enters the port B through port P; when the valve core is driven to move to the left until the inlet P is connected to the working port A, the liquid enters the port A through port P. After the directional valve is opened, due to the existence of the valve core transition area (8), the valve opening degree changes linearly proportionally with the valve core displacement, see Figure 19 This enables the proportional switching of the directional valve.

[0056] Example 2: The transition area of ​​the valve core is any combination of a wave-shaped structure and other structures.

[0057] A hydraulic proportional directional valve structure for engineering machinery using pure water or high water-based fluids mainly includes a directional valve body and a drive unit. The directional valve body comprises a left valve cover (2), a valve body (3), a valve core (4), and a right valve cover (5). The valve body contains a valve cavity (3-1) and inlet / outlet flow holes. The valve core (4) is coaxially mounted in the valve cavity (3-1) inside the valve body. A transition area is machined on the valve core. The flow area formed between the valve core and the valve body flow holes during valve core movement is called the valve port. The valve port opening is changed by altering the valve core displacement, and the relationship between the flow area of ​​the valve port and the valve core displacement is changed by altering the shape and size of the transition area. The drive unit is an electric push rod (1), which is installed on either the left or right side of the directional valve body. The push rod achieves linear movement under motor control.

[0058] The valve core (4) is a rotating structure, comprising a shoulder (6) and a groove (7). The part where the shoulder (6) and the groove (7) connect is called the valve core transition area (8) (see [reference]). Figure 15 ).

[0059] Specifically, the electric push rod (1) is connected to the valve core (4) and drives the valve core to make linear reciprocating motion in the valve cavity.

[0060] Specifically, the wavy valve core transition area (9) includes any combination of arc structure, wavy structure, and right angle structure.

[0061] For details, see Figure 16When the valve core is in the neutral position, under the action of the outer circle generatrix of the valve core shoulder and the sealing element, the valve body inlet is not connected to either working port, and the directional valve is in the closed state. When the electric push rod is activated, the valve core is driven to move to the right until the inlet P is connected to the working port B, and the liquid enters the port B through port P. When the electric push rod is activated, the valve core is driven to move to the left until the inlet P is connected to the working port A, and the liquid enters the port A through port P. After the directional valve is opened, due to the existence of the wavy valve core transition area (9), the valve opening changes in a wavy manner with the valve core displacement, see Figure 20 .

[0062] Example 3: The transition area of ​​the valve core is a stepped structure in any combination with other structures.

[0063] A hydraulic proportional directional valve structure for engineering machinery using pure water or high water-based fluids mainly includes a directional valve body and a drive unit. The directional valve body comprises a left valve cover (2), a valve body (3), a valve core (4), and a right valve cover (5). The valve body contains a valve cavity (3-1) and inlet / outlet flow holes. The valve core (4) is coaxially mounted in the valve cavity (3-1) inside the valve body. A transition area is machined on the valve core. The flow area formed between the valve core and the valve body flow holes during valve core movement is called the valve port. The valve port opening is changed by altering the valve core displacement, and the relationship between the flow area of ​​the valve port and the valve core displacement is changed by altering the shape and size of the transition area. The drive unit is an electric push rod (1), which is installed on either the left or right side of the directional valve body. The push rod achieves linear movement under motor control.

[0064] The valve core (4) is a rotating structure, comprising a shoulder (6) and a groove (7). The part where the shoulder (6) and the groove (7) connect is called the valve core transition area (8) (see [reference]). Figure 15 ).

[0065] Specifically, the electric push rod (1) is connected to the valve core (4) and drives the valve core to make linear reciprocating motion in the valve cavity.

[0066] Specifically, the stepped valve core transition area (10) includes any combination of arc structure, stepped structure, and right angle structure.

[0067] For details, see Figure 17 When the valve core is in the neutral position, under the action of the outer circle generatrix of the valve core shoulder and the sealing element, the valve body inlet is not connected to either working port, and the directional valve is in the closed state. When the electric push rod is activated, the valve core is driven to move to the right until the inlet P is connected to the working port B, and the liquid enters the port B through port P; when the valve core is driven to move to the left until the inlet P is connected to the working port A, the liquid enters the port A through port P. After the directional valve is opened, due to the existence of the stepped valve core transition area (10), the valve opening changes in a stepped manner with the displacement of the valve core, such as Figure 21As shown.

[0068] Example 4: The transition region of the valve cavity is any combination of the valve cavity oblique structure and other structures.

[0069] A hydraulic proportional directional valve structure for engineering machinery using pure water or high water-based fluids mainly includes a directional valve body and a drive unit. The directional valve body comprises a left valve cover (2), a valve body (3), a valve core (4), and a right valve cover (5). The valve body contains a valve cavity (3-1) and inlet / outlet flow holes. The valve core (4) is coaxially mounted in the valve cavity (3-1) inside the valve body. A transition area is machined on the valve body. The flow area formed between the valve core and the valve body flow holes during valve core movement is called the valve port. The valve port opening is changed by altering the valve core displacement, and the relationship between the flow area of ​​the valve port and the valve core displacement is changed by altering the shape and size of the transition area. The drive unit is an electric push rod (1), which is installed on either the left or right side of the directional valve body. The push rod achieves linear movement under motor control.

[0070] The valve core (4) is a rotating structure, consisting of a shoulder (6) and a groove (7).

[0071] Specifically, the part where the flow hole inside the valve body (3) connects to the valve cavity (3-1) is called the valve cavity transition area (11).

[0072] Specifically, the electric push rod (1) is connected to the valve core (4) and drives the valve core to make linear reciprocating motion in the valve cavity.

[0073] The valve cavity transition region (11) includes any combination of valve cavity right-angle structure (11-1), valve cavity oblique structure (11-2), and valve cavity arc structure (11-3), wherein the valve cavity right-angle structure (11-1) is a vertical transition perpendicular to the valve cavity axis, and the valve cavity oblique structure (11-2) is an inclined transition with a slope of k (|k|≠0).

[0074] For details, see Figure 18 When the valve core is in the neutral position, under the action of the outer circle generatrix of the valve core shoulder and the sealing element, the valve body inlet is not connected to either working port, and the directional valve is in the closed state. When the electric push rod is activated, the valve core is driven to move to the right until the inlet P is connected to the working port B, and the liquid enters the port B through port P; when the valve core is driven to move to the left until the inlet P is connected to the working port A, the liquid enters the port A through port P. After the directional valve is opened, due to the existence of the valve cavity transition area (11), the valve opening degree changes linearly proportionally with the valve core displacement, see Figure 19 This enables the proportional switching of the directional valve.

[0075] Example 5:

[0076] The angled structure (11-2) in the transition region (11) of the valve cavity can be replaced with a wave-like structure or a stepped structure, as well as other structures based on different effects.

[0077] Example 6:

[0078] The proportional valve structure described can be applied to two-position two-way proportional directional valve structures, two-position three-way proportional directional valve structures, two-position four-way proportional directional valve structures, three-position four-way proportional directional valve structures, etc.

Claims

1. A hydraulic proportional directional valve structure for engineering machinery using pure water or high water-based fluids, mainly comprising a directional valve body and a drive unit, characterized in that: The reversing valve body includes a left valve cover (2), a valve body (3), a valve core (4), and a right valve cover (5). The valve body contains a valve cavity (3-1) and flow holes for inlet and outlet liquids. The valve core (4) is coaxially installed in the valve cavity (3-1) inside the valve body. The flow area formed between the valve core and the flow hole of the valve body is called the valve port. Sealing grooves are provided on both sides of the valve port inside the valve body, and sealing rings are installed in the sealing grooves. The valve port opening is changed by changing the valve core displacement. The valve core and valve body can be machined to form a transition area. The relationship between the flow area of ​​the valve port and the valve core displacement is changed by changing the shape and size of the transition area. The driving part is an electric push rod (1). The electric push rod (1) is installed on either the left or right side of the reversing valve body. The push rod achieves linear motion under the control of the motor.

2. The structure of a hydraulic proportional directional valve for engineering machinery using pure water or high water-based fluids as described in claim 1, characterized in that: The valve core (4) is a rotating body structure, consisting of a shoulder (6) and a groove (7). The part where the shoulder (6) and the groove (7) are connected is called the valve core transition area (8).

3. The structure of a hydraulic proportional directional valve for engineering machinery using pure water or high water-based fluids as described in claim 1, characterized in that: The part where the flow hole inside the valve body (3) connects to the valve cavity (3-1) is called the valve cavity transition area (11).

4. The structure of a hydraulic proportional directional valve for engineering machinery using pure water or high water-based fluids as described in claim 1, characterized in that: The electric push rod (1) is connected to the valve core (4) and drives the valve core (4) to perform linear reciprocating motion.

5. The structure of a hydraulic proportional directional valve for engineering machinery using pure water or high water-based fluids as described in claim 2, characterized in that: The valve core transition area (8) includes any combination of arc structure (8-1), oblique structure (8-2), and right angle structure (8-3), wherein the oblique structure (8-2) is an inclined transition with a slope of k, k≠0; and the right angle structure (8-3) is a vertical transition perpendicular to the valve core axis.

6. The structure of a hydraulic proportional directional valve for engineering machinery using pure water or high water-based fluids as described in claim 2, characterized in that: By setting the number and size of the valve core shoulder (6), the valve core's center position function can be Y-type, H-type, O-type, P-type, or M-type.

7. The structure of a hydraulic proportional directional valve for engineering machinery using pure water or high water-based fluids as described in claim 3, characterized in that: The transition region (11) of the valve cavity includes any combination of the right-angle structure (11-1), the oblique structure (11-2), and the circular arc structure (11-3) of the valve cavity. The right-angle structure (11-1) is a vertical transition perpendicular to the valve cavity axis, and the oblique structure (11-2) is an inclined transition with a slope of k, where k≠0.

8. The structure of a hydraulic proportional directional valve for engineering machinery using pure water or high water-based fluids as described in claim 2, characterized in that: The valve core transition area (8) can be replaced with a wave-shaped structure or a stepped structure to form a wave-shaped transition area or a stepped transition area.

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