Two-way cone valve type proportional reversing throttle valve

Abstract

The utility model discloses a two-way cone valve type proportional reversing throttle valve which comprises a valve body, the valve body comprises a threaded sleeve and a valve sleeve which are connected in a threaded mode, a first oil port and a second oil port are formed in the valve sleeve, a valve element is arranged in the valve sleeve, a radial damping hole and an axial small hole are formed in the valve element, and the aperture of the radial damping hole is smaller than that of the axial small hole. The threaded sleeve is connected with a proportion electromagnet, an armature of the proportion electromagnet is connected with a pilot valve element, and the pilot valve element is provided with a conical head matched with the small axial hole. The electromagnetic reversing valve has the advantages that the structure is reasonable, the functions of a conventional two-way cone valve electromagnetic reversing valve can be achieved, meanwhile, the opening amount of the cone valve can be continuously adjusted, and the throttling function is achieved. Continuous adjustment of the opening degree of the cone valve is achieved through the proportional electromagnet, the opening degree of the cone valve can be controlled only by changing the current of the electromagnet, and therefore the flow is controlled, the control mode is very flexible, and operation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic system load protection, in particular to a two-way cone valve type proportional reversing throttle valve. Background Art

[0002] In the load holding circuit of the hydraulic system, a cone valve type electromagnetic reversing valve is usually used. This type of electromagnetic reversing valve is a two-way cone valve structure. When the electromagnet is not energized, one direction can keep the system pressure from dropping, and the other direction can allow the pressure oil to enter the load holding chamber. After the electromagnet is energized, the pressure holding chamber can be opened, allowing the pressure oil in the load chamber to leak into the return oil pipeline, and the load can move.

[0003] Once the existing electromagnetic reversing valve of this type is powered on, the valve port is fully opened. In order to make the movement speed of the load controllable, it needs to be used in series with a throttle valve or a speed regulating valve. Once the opening of the throttle valve or the speed regulating valve is adjusted, the movement speed of the load is adjusted. If you want to change the movement speed, you can only adjust the throttle valve or the speed regulating valve again, which is very troublesome to use. Under some working conditions, the speed cannot even be adjusted, resulting in great restrictions on the operation of the system. Therefore, the structure of the existing cone valve type electromagnetic reversing valve needs to be further improved. Utility Model Content

[0004] The purpose of the utility model is to make up for the above-mentioned deficiencies and disclose to the public a two-way cone valve type proportional reversing throttle valve which has a reasonable structure, is easy to operate and can continuously adjust the opening amount of the cone valve.

[0005] The technical solution of the utility model is achieved in this way:

[0006] A two-way cone valve type proportional reversing throttle valve comprises a valve body, the valve body comprises a screw sleeve and a valve sleeve which are screwed together, a first oil port and a second oil port are arranged in the valve sleeve, a valve core is arranged in the valve sleeve, a radial damping hole and an axial small hole are arranged on the valve core, the aperture of the radial damping hole is smaller than the aperture of the axial small hole, the screw sleeve is connected to a proportional electromagnet, the armature of the proportional electromagnet, the armature is connected to a pilot valve core, and the pilot valve core is provided with a conical head which matches the axial small hole.

[0007] The measures to further optimize this technical solution are:

[0008] As an improvement, the proportional electromagnet includes an armature, a magnetic sleeve and a coil. The magnetic sleeve is provided with a locking nut for fixing the coil. The magnetic sleeve is threadedly connected to the threaded sleeve. The armature can be axially movably assembled in the magnetic sleeve, and the coil is sleeved outside the magnetic sleeve.

[0009] As an improvement, the tail end of the magnetic sleeve is provided with an adjusting screw, the adjusting screw is equipped with an adjusting nut, and an adjusting spring is provided between the adjusting screw and the armature. A manual emergency structure is designed, and the pilot valve port can be slowly opened by turning the adjusting screw.

[0010] As an improvement, a limiting sleeve is provided between the magnetic conductive sleeve and the valve sleeve.

[0011] As an improvement, a first spring is arranged between the pilot valve core and the armature, and a second spring is arranged between the pilot valve core and the valve core.

[0012] As an improvement, the pilot valve core is provided with a first through hole communicating with the radial damping hole of the valve core, and the armature is provided with a second through hole communicating with the first through hole.

[0013] As an improvement, the first oil port is axially arranged on the valve sleeve, and the second oil port is radially arranged on the valve sleeve.

[0014] As an improvement, a first filter is provided on the second oil port, and a second filter is provided on the radial damping hole of the valve core.

[0015] As an improvement, a conical surface is provided on the valve core at one end close to the first oil port.

[0016] The advantages of the utility model compared with the prior art are:

[0017] The utility model is a two-way cone valve type proportional reversing throttle valve, which has a reasonable structure and can realize the function of a conventional two-way cone valve electromagnetic reversing valve, and can also continuously adjust the opening amount of the cone valve to realize the throttling function. The continuous adjustment of the cone valve opening amount is realized by a proportional electromagnet. As long as the size of the electromagnet current is changed, the opening size of the cone valve can be controlled, thereby controlling the flow rate. The control method is very flexible and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural diagram of an embodiment of the utility model;

[0019] Figure 2 It is a top view of an embodiment of the utility model;

[0020] Figure 3 yes Figure 2 Enlarged view of part A in the middle;

[0021] Figure 4 yes Figure 2 Enlarged view of middle part B;

[0022] Figure 5 yes Figure 2 Enlarged view of part C in the middle.

[0023] The names of the reference numerals in the accompanying drawings of the present utility model are:

[0024] Screw sleeve 1, valve sleeve 2, first oil port 2a, second oil port 2b, valve core 3, radial damping hole 3a, axial small hole 3b, conical surface 3c, armature 41, magnetic sleeve 42, locking nut 42a, coil 43, adjusting screw 44, adjusting nut 45, adjusting spring 46, pilot valve core 5, first through hole 5a, conical head 51, limit sleeve 6, first spring 71, second spring 72, first filter screen 81, second filter screen 82. DETAILED DESCRIPTION

[0025] The utility model is further described in detail below with reference to the accompanying drawings:

[0026] The following description is used to disclose the utility model so that those skilled in the art can implement the utility model. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the utility model defined in the following description can be used for other implementation schemes, variations, improvements, equivalent schemes, and other technical solutions that do not deviate from the spirit and scope of the utility model.

[0027] Those skilled in the art should understand that, in the disclosure of the present invention, the directions or positions indicated by the terms "longitudinal", "lateral", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings, which are only simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the above terms should not be understood as limitations on the present invention.

[0028] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0029] like Figures 1 to 5As shown, a two-way cone valve type proportional reversing throttle valve includes a valve body, the valve body includes a screw sleeve 1 and a valve sleeve 2 which are screwed together, the valve sleeve 2 is provided with a first oil port 2a and a second oil port 2b, the valve sleeve 2 is provided with a valve core 3, the valve core 3 is provided with a radial damping hole 3a and an axial small hole 3b, the aperture of the radial damping hole 3a is smaller than the aperture of the axial small hole 3b, the screw sleeve 1 is connected to a proportional electromagnet, the armature 41 of the proportional electromagnet, the armature 41 is connected to a pilot valve core 5, and the pilot valve core 5 is provided with a conical head 51 which matches the axial small hole 3b.

[0030] The proportional electromagnet includes an armature 41, a magnetic sleeve 42 and a coil 43. The magnetic sleeve 42 is provided with a locking nut 42a for fixing the coil 43. The magnetic sleeve 42 is threadedly connected to the screw sleeve 1. The armature 41 can be axially movably assembled in the magnetic sleeve 42, and the coil 43 is sleeved outside the magnetic sleeve 42.

[0031] An adjusting screw 44 is disposed at the tail end of the magnetic conductive sleeve 42 . An adjusting nut 45 is mounted on the adjusting screw 44 . An adjusting spring 46 is disposed between the adjusting screw 44 and the armature 41 .

[0032] A limiting sleeve 6 is provided between the magnetic conductive sleeve 42 and the valve sleeve 2 .

[0033] A first spring 71 is provided between the pilot valve core 5 and the armature 41 , and a second spring 72 is provided between the pilot valve core 5 and the valve core 3 .

[0034] The pilot valve core 5 is provided with a first through hole 5a communicating with the radial damping hole 3a of the valve core 3, and the armature 41 is provided with a second through hole 41a communicating with the first through hole 5a. The first through hole 5a is composed of a radial hole and an axial hole.

[0035] The first oil port 2 a is axially arranged on the valve sleeve 2 , and the second oil port 2 b is radially arranged on the valve sleeve 2 .

[0036] The second oil port 2 b is provided with a first filter screen 81 , and the radial damping hole 3 a of the valve core 3 is provided with a second filter screen 82 .

[0037] The valve core 3 is provided with a conical surface 3c at one end close to the first oil port 2a.

[0038] like Figure 2As shown, the valve body of the two-way cone valve type proportional reversing throttle valve includes a screw sleeve 1 and a valve sleeve 2 which are screwed together. The left end of the screw sleeve 1 is connected to a proportional electromagnet, and the right end is connected to the valve sleeve 2 to form a complete valve structure. A sealing structure is provided at the front end of the outer circle of the valve sleeve 2. Together with the seal at the rear of the outer thread of the screw sleeve 1, two sealing structures are provided on the outside of the valve body. Between the sealing structures is the second oil port 2b (radial oil hole) of the valve sleeve 2, and the right end face of the valve sleeve 2 is the first oil port 2a (axial oil hole). The inside of the valve sleeve 2 is a stepped hole, the inner hole at the left end and the outer circle clearance of the left end of the valve core 3 are matched, the inner hole at the right end and the outer circle clearance of the right end of the valve core 3 are matched, and the end face of the inner hole at the right end and the conical surface 3c on the valve core 3 are abutted to form a conical surface seal. There is an annular groove between the inner holes at the left and right ends of the valve sleeve 2, which is connected to the second oil port 2b. The left end of the valve sleeve 2 is provided with a limit sleeve 6, and the left end of the limit sleeve 6 is installed with a magnetic sleeve 42. The external thread on the right end of the magnetic sleeve 42 is connected with the internal thread on the left end of the threaded sleeve 1. The left end of the magnetic sleeve 42 is also provided with an external thread, and a locking nut 42a is screwed on it to fix the coil 43. The inner hole at the left end of the magnetic sleeve 42 is designed with a manual emergency operating mechanism, including an adjusting screw 44, an adjusting nut 45 and an adjusting spring 46. The adjusting spring 46 is installed between the adjusting screw 44 and the armature 41. The right end of the armature 41 is connected to the pilot valve core 5. The middle outer circle of the pilot valve core 5 and the inner hole of the valve core 3 are clearance-matched. The right end of the pilot valve core 5 is provided with a conical head 51. The valve core 3 is provided with a radial damping hole 3a and an axial small hole 3b. The conical head 51 forms a conical surface seal with the axial small hole 3b.

[0039] Working principle:

[0040] like Figure 2 As shown, Figure 2 The middle is the initial state, at which the proportional solenoid has no current. When the pressure oil enters from the second oil port 2b, it enters the inside of the valve sleeve 2 through the second oil port 2b of the valve sleeve 2, and acts on the outer circle of the right end of the valve core 3 and the inner hole end face of the left end of the valve sleeve 2. The sealing structure composed of the inner hole end face of the left end of the valve sleeve 2 and the cone surface of the right end of the valve core 3 is the main valve port of this throttle valve. The pressure oil enters the inside of the valve core 3 from the outer circle of the right end of the valve core 3 through the radial damping hole 3a, and acts on the pilot valve core 5 and the cone head 51 inside the valve core 3. This is the cone surface pilot valve port of this throttle valve. Then it enters the inside of the magnetic sleeve 42 through the first through hole 5a of the pilot valve core 5. Due to the internal step structure of the valve sleeve 2, the diameter of the left end of the valve core 3 is larger than the diameter of the right end. Under the action of hydraulic pressure, the valve core 3 is pressed against the inner end face of the valve sleeve 2, and the second oil port 2b and the first oil port 2a complete the cone surface sealing isolation.

[0041] When the proportional solenoid is loaded with current and the electromagnetic force is greater than the pre-compression force of the regulating spring 46, the armature 41 moves to the left, thereby driving the pilot valve core 5 to move to the left as well, so as to open the pilot valve port, and the pressure oil enters the first oil port 2a from the inner cavity of the pilot valve core 5 through the radial damping hole 3a of the valve core 3. Since the radial damping hole 3a of the valve core 3 is smaller in diameter than the axial small hole 3b, a pressure difference is generated between the second oil port 2b and the first oil port 2a, and the oil pressure pushes the valve core 3 to move to the left, opening the conical surface of the main valve port.

[0042] Working principle of manual emergency structure:

[0043] When the system has no current, in order to control the load movement, a manual emergency operating mechanism must be added. Usually, the working process of this load is to descend with load or rotate with load, and the pressure is relatively high. The system pressure must be released slowly to ensure the safety of the work. The conical sealing structure of the throttle valve adopts the form of conical surface and right-angle hole matching, and the tight sealing is achieved under the action of the adjusting spring 46 and the first spring 71. When manual operation is required to open slowly, it is only necessary to turn the adjusting screw 44 to gradually reduce the spring compression force. At the same time, the spring force must be limited to a certain fixed value and cannot be reduced indefinitely to prevent the opening from being too large. Since the pilot valve core 5 acts on the axial small hole 3b of the valve core 3, the oil pressure generated on the axial small hole 3b is rightward, which is the trend of closing the valve core 3. When the adjusting spring 46 is not compressed, the oil pressure will still generate a rightward force on the pilot valve core 5 to close the pilot valve port, so a second spring 72 is set on the right end face of the pilot valve core 5 to push the pilot valve core 5 to move to the left to open the pilot valve port. As long as the appropriate spring stiffness and pre-compression are set, the pilot valve port can be slowly opened by coordinating the leftward movement of the adjusting screw 44, and then the maximum opening of the valve port can be limited by limiting the displacement of the adjusting screw 44 to the left.

[0044] The two-way cone valve type proportional reversing throttle valve of the utility model can directly replace the existing electromagnetic throttle valve without changing the installation hole, which is very convenient for customers to directly upgrade the control process on the existing system and improve the convenience of operation.

[0045] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments. Without departing from the principles, the embodiments of the present invention may be deformed or modified in any way.

Claims

1. A two-way cone valve type proportional reversing throttle valve, comprising a valve body, characterized in that: The valve body comprises a screw sleeve (1) and a valve sleeve (2) which are screwed together. The valve sleeve (2) is provided with a first oil port (2a) and a second oil port (2b). The valve sleeve (2) is provided with a valve core (3). The valve core (3) is provided with a radial damping hole (3a) and an axial small hole (3b). The diameter of the radial damping hole (3a) is smaller than the diameter of the axial small hole (3b). The screw sleeve (1) is connected to a proportional electromagnet. The armature (41) of the proportional electromagnet is connected to a pilot valve core (5). The pilot valve core (5) is provided with a conical head (51) which matches the axial small hole (3b).

2. A two-way cone valve type proportional reversing throttle valve according to claim 1, characterized in that: The proportional electromagnet comprises an armature (41), a magnetic sleeve (42) and a coil (43); the magnetic sleeve (42) is provided with a locking nut (42a) for fixing the coil (43); the magnetic sleeve (42) is threadedly connected to the screw sleeve (1); the armature (41) can be axially movably assembled in the magnetic sleeve (42); and the coil (43) is sleeved outside the magnetic sleeve (42).

3. A two-way cone valve type proportional reversing throttle valve according to claim 2, characterized in that: An adjusting screw (44) is arranged at the tail end of the magnetic conductive sleeve (42), an adjusting nut (45) is mounted on the adjusting screw (44), and an adjusting spring (46) is arranged between the adjusting screw (44) and the armature (41).

4. A two-way cone valve type proportional reversing throttle valve according to claim 3, characterized in that: A limiting sleeve (6) is provided between the magnetic conductive sleeve (42) and the valve sleeve (2).

5. A two-way cone valve type proportional reversing throttle valve according to claim 4, characterized in that: A first spring (71) is arranged between the pilot valve core (5) and the armature (41), and a second spring (72) is arranged between the pilot valve core (5) and the valve core (3).

6. A two-way cone valve type proportional reversing throttle valve according to any one of claims 1 to 5, characterized in that: The pilot valve core (5) is provided with a first through hole (5a) communicating with the radial damping hole (3a) of the valve core (3), and the armature (41) is provided with a second through hole (41a) communicating with the first through hole (5a).

7. A two-way cone valve type proportional reversing throttle valve according to claim 6, characterized in that: The first oil port (2a) is axially arranged on the valve sleeve (2), and the second oil port (2b) is radially arranged on the valve sleeve (2).

8. A two-way cone valve type proportional reversing throttle valve according to claim 7, characterized in that: The second oil port (2b) is provided with a first filter screen (81), and the radial damping hole (3a) of the valve core (3) is provided with a second filter screen (82).

9. A two-way cone valve type proportional reversing throttle valve according to claim 8, characterized in that: The valve core (3) is provided with a conical surface (3c) at one end close to the first oil port (2a).

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