Two-way cone valve type direction valve

Abstract

The utility model provides a two-way cone valve type direction valve, which relates to the field of valves and comprises a valve sleeve, a threaded sleeve and an electromagnet, the rear end of the valve sleeve is connected with the threaded sleeve through threads, and the rear end of the threaded sleeve is connected with the electromagnet through threads to form a detachable integral structure. The side face of the valve sleeve is provided with an oil inlet, the front end face of the valve sleeve is provided with an oil outlet, and the oil inlet and the oil outlet form a two-way structure. A stepped hole is formed in the valve sleeve, the main valve element, the reset spring and the pilot valve element are sequentially arranged in the large-diameter hole, and a throttling groove is formed in the right end face of the main valve element. Through the two-stage damping structure (the radial damping hole and the axial damping hole) on the main valve element, the throttling groove in the right end face of the main valve element and other structures, the pressure difference buffering and throttling effects are formed in the oil flowing process. When the system works, the pressure building speed can be reduced, pressure impact can be effectively reduced, hydraulic elements in the system are protected, the equipment maintenance cost is reduced, the stability of the system is improved, and the service life of the system is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the valve field especially two -way cone valve type direction valve. BACKGROUND

[0002] In the hydraulic system, the application of the normally open two -way cone valve type switch valve is more extensive, especially is often set in the pump mouth place. When the system is in the non - working state, the hydraulic oil of pump output can be directly returned to the oil tank via the normally open switch valve, so that the system maintains in the low pressure standby state. When the system starts to work, the coil of the normally open cone valve type switch valve needs to be electrified, at this time, the valve is closed, the system starts to establish pressure, and lays the foundation for the subsequent action operation. Why adopt the cone valve structure is mainly to reduce the internal leakage of the valve as far as possible, thereby effectively guaranteeing the volumetric efficiency of the system.

[0003] However, the prior art has many obvious defects. On the one hand, when the coil of the normally open cone valve type switch valve is electrified, the establishment speed of the system pressure is extremely fast, about only 60ms. This over - fast pressure establishment can cause great pressure impact on various elements in the system, and even can directly damage the hydraulic elements when serious, not only increases the maintenance cost of the equipment, but also affects the stability and service life of the whole system.

[0004] On the other hand, in the system for controlling the movement of the oil cylinder, although the normally open two -way cone valve type switch valve can cooperate with other elements to control the movement speed of the oil cylinder, due to the characteristics of the switch valve itself, the control of the movement speed of the oil cylinder in this kind of system is not stable, the movement impact problem is more prominent, it is difficult to meet some work scenes with high requirements on movement precision and stability, and the application of the hydraulic system in more high - end fields is limited.

[0005] In view of the problems existing in the prior art, the two -way cone valve type direction valve is proposed. CONTENT OF THE UTILITY MODEL

[0006] The utility model discloses in view of the deficiency in the prior art, through the two - stage damping structure (radial damping hole and axial damping hole) on the main valve core and the throttle groove of the right end face of main valve core and so on structure, form pressure difference buffer and throttle effect in the oil flow process. When the system works, can slow down the pressure establishment speed, effectively reduce pressure impact, protect the hydraulic element in the system, reduce the equipment maintenance cost, improve the stability and service life of the system.

[0007] In order to solve the above technical problems, the utility model discloses the following technical scheme can effectively solve the problem of big pressure impact and unstable flow change in the original valve system.

[0008] In order to realize the above -mentioned purpose, the utility model discloses the following technical scheme:

[0009] Two-way cone valve type directional valve, comprising:

[0010] The valve sleeve rear end is connected with the screw sleeve through threads, the screw sleeve rear end is connected with the electromagnet through threads, and a detachable integral structure is formed.

[0011] The valve sleeve side is provided with an oil inlet, and the front end face is provided with an oil outlet, and the two form a two-way structure.

[0012] The valve sleeve is internally provided with a stepped hole, a main valve core, a reset spring and a pilot valve core are sequentially arranged in the large-diameter hole, the right end face of the main valve core is provided with a throttling groove, and the left end outer circle is in gap cooperation with the valve sleeve inner hole to form dynamic sealing.

[0013] Preferably, the right end of the valve sleeve is provided with a first sealing structure, the left end is provided with external threads, a radial through hole is arranged between the external threads and the first sealing structure, the radial through hole communicates with the valve sleeve internal large-diameter hole to form the oil inlet, and the oil outlet is located in the valve sleeve front end small stepped hole, so as to guide the throttling hole of the main valve core.

[0014] Preferably, the right end of the screw sleeve is provided with external threads and is connected with the screw sleeve internal threads, the left end of the screw sleeve is provided with internal threads and is connected with the electromagnet external threads, the electromagnet is limited by the screw sleeve, and a second sealing structure is arranged between the electromagnet and the screw sleeve.

[0015] Preferably, the right end inner hole of the electromagnet is provided with an axially movable spring seat one and a spring seat two, a preset spring is arranged between the spring seat one and the spring seat two, the left end step of the pilot valve core is clamped in the spring seat two, and the right end is inserted into the inner hole of the main valve core, so as to form a pilot control oil way.

[0016] Preferably, the main valve core is provided with two-stage damping structures, including a radial damping hole communicating the oil inlet with the main valve core inner cavity and an axial damping hole communicating the oil outlet with the main valve core inner cavity.

[0017] Preferably, the reset spring is pre-pressed and installed between the main valve core and the pilot valve core, and the pre-tightening force of the reset spring makes the main valve core closely adhere to the valve sleeve step face in a normal state, so as to form a normally closed state.

[0018] Preferably, the spring seat two and the electromagnet inner hole adopt gap cooperation, and the spring seat two is allowed to drive the pilot valve core to axially displace when the electromagnet is electrified.

[0019] Preferably, the right end face of the main valve core and the valve sleeve step face form a variable throttling gap, and the opening degree of the variable throttling gap linearly changes with the electromagnet current.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] The two-way cone valve type directional valve provided by the application can form pressure difference buffering and throttling effects in the process of oil flow through the two-stage damping structure (radial damping hole and axial damping hole) on the main valve core and the throttling groove on the right end face of the main valve core. When the system is working, the pressure building speed can be slowed down, the pressure impact can be effectively reduced, the hydraulic components in the system can be protected, the equipment maintenance cost can be reduced, and the stability and service life of the system can be improved.

[0022] The throttling groove area change of the main valve core of the directional valve of the application adopts a two-section folded line shape (triangular groove and circular arc groove are combined and arranged axially staggered), realizing the double slope characteristics of throttling area change. When the flow is large, the slope is large, meeting the demand of passing large flow in the opening stage; when the flow is small, the slope is small, and the flow change is small when closing fast, so that the closing process is smoother, thereby realizing the smooth change of flow, meeting the working scene with high requirements on movement accuracy and stability, and widening the application range of the hydraulic system.

[0023] The application can change the axial position of the pilot valve core by adjusting the screw at the rear of the electromagnet, thereby adjusting the size of the throttling port, realizing the adjustment of the maximum flow, and flexibly adjusting the system flow according to different working conditions. On the other hand, the same main valve core front throttling groove structure is adopted, only the flow area is changed, and different flow range requirements can be realized within the same main valve core stroke, realizing more fine flow adjustment, and enhancing the applicability of the valve and the precision of system control.

[0024] The two-way cone valve type directional valve of the application adopts the same mounting hole as the existing on-off valve, can directly replace the existing on-off valve product, does not need to greatly change the installation structure of the system, reduces the replacement cost and installation difficulty, and improves the efficiency of equipment upgrading. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical scheme in the embodiments of the application, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0026] Figure 1 It is a schematic diagram of the overall structure of the application;

[0027] Figure 2 It is a schematic diagram of the local structure of the application.

[0028] Figure number explanation: 1, valve sleeve; 101, oil outlet; 102, oil inlet; 103, first sealing structure; 104, radial through hole; 2, screw sleeve; 201, second sealing structure; 3, electromagnet; 4, main valve core; 401, throttling groove; 402, radial damping hole; 403, axial damping hole; 5, return spring; 6, pilot valve core; 7, spring seat one; 8, spring seat two; 9, preset spring. DETAILED DESCRIPTION

[0029] The utility model will be described in further detail below in combination with the drawings.

[0030] 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 in the following description are only as examples, and other obvious modifications can be thought of by those skilled in the art. The basic principles of the utility model defined in the following description can be used in other implementation schemes, modification schemes, improvement schemes, equivalent schemes and other technical schemes without departing from the spirit and scope of the utility model.

[0031] Those skilled in the art should understand that in the disclosure of the utility model, the orientation or position indicated by the terms "longitudinal", "transverse", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, which is only for the convenience of the simplified description of the utility model, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore the above-mentioned terms cannot be understood as a limitation of the utility model.

[0032] It can 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 one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as a limitation on the number. EMBODIMENT

[0033] Please refer to Figure 1 and Figure 2 , two-way cone valve type directional valve, comprising:

[0034] Valve sleeve 1, screw sleeve 2 and electromagnet 3, the rear end of valve sleeve 1 is connected with screw sleeve 2 through screw thread, and the rear end of screw sleeve 2 is connected with electromagnet 3 through screw thread, forming a detachable whole structure;

[0035] The side surface of valve sleeve 1 is provided with oil inlet 102, and the front end surface is provided with oil outlet 101, forming a two-way structure;

[0036] The valve sleeve 1 is internally provided with a stepped hole, and the main valve core 4, the reset spring 5 and the pilot valve core 6 are sequentially arranged in the large-diameter hole. The right end surface of the main valve core 4 is provided with a throttling groove 401, and the left end outer circle is in clearance fit with the inner hole of the valve sleeve 1 to form a dynamic seal.

[0037] The two-way cone valve type directional valve of the present application is mainly composed of a valve sleeve 1, an oil outlet 101, an oil inlet 102, a screw sleeve 2, an electromagnet 3, a main valve core 4, a reset spring 5, a pilot valve core 6 and a throttling groove 401, and the following is the detailed structure and working principle.

[0038] I. Detailed structure and connection mode of each component

[0039] Overall assembly of the valve:

[0040] The valve sleeve 1, the screw sleeve 2 and the electromagnet 3 are connected by threads. The external threads at the rear end of the valve sleeve 1 are screwed and connected with the internal threads at the right end of the screw sleeve 2, and then the internal threads at the left end of the screw sleeve 2 are screwed and connected with the external threads at the right end of the electromagnet 3, thereby forming a detachable overall structure. During the connection process, the screw sleeve 2 is limited by the electromagnet 3, and the second sealing structure 201 between the screw sleeve 2 and the electromagnet 3 can effectively prevent oil leakage. The first sealing structure 103 at the right end of the outer part of the valve sleeve 1 can ensure the sealing of the connection part of the valve sleeve 1 with the outside, preventing oil from leaking out of the right end of the valve sleeve 1.

[0041] In the large-diameter stepped hole in the valve sleeve 1, the main valve core 4, the reset spring 5 and the pilot valve core 6 are sequentially installed. The reset spring 5 is pre-pressed and installed between the main valve core 4 and the pilot valve core 6, so that in the normal state, the pre-tightening force of the reset spring 5 can push the main valve core 4 to the right end, making it tightly adhere to the stepped surface of the valve sleeve 1. At this time, the oil outlet 101 and the oil inlet 102 are in a closed state, i.e. the two-way cone valve type directional valve is in a normally closed state.

[0042] In the right end inner hole of the electromagnet 3, the axially movable spring seat one 7 and the spring seat two 8 are installed, and the pre-set spring 9 is placed between them. The outer circle of the spring seat one 7 is sleeved on the stepped hole of the inner hole of the screw sleeve 2, the outer circle of the spring seat two 8 is in clearance fit with the right end inner hole of the electromagnet 3, and the left end of the spring seat two 8 is limited by the end surface of the inner hole of the electromagnet 3. The left end step of the pilot valve core 6 is clamped in the spring seat two 8, and the right end is inserted into the inner hole of the main valve core 4 to form a pilot control oil way.

[0043] Oil port and related structure setting:

[0044] The radial through hole 104 on the side of the valve sleeve 1 communicates with the large diameter hole inside the valve sleeve 1, constituting the oil inlet 102; the small stepped hole on the front end face constitutes the oil outlet 101, which also serves as the guide throttle hole of the small diameter part of the main valve core 4. The main valve core 4 is provided with a two-stage damping structure, the radial damping hole 402 communicates the oil inlet 102 with the inner cavity of the main valve core 4, the axial damping hole 403 communicates the oil outlet 101 with the inner cavity of the main valve core 4, and the inner cavity of the main valve core 4 is further communicated with the cavity of the electromagnet 3 through the gap between the parts, constituting an internal oil circuit balance channel.

[0045] The right end face of the main valve core 4 is provided with a throttle groove 401, which forms a variable throttle gap with the stepped face of the valve sleeve 1. On the actual part, the throttle groove 401 adopts the form of a combination of a triangular groove and a circular arc groove, and is arranged axially staggered to meet the requirement of throttle area change.

[0046] Proportional electromagnet 3 related settings:

[0047] The proportional electromagnet 3 realizes the proportional change characteristic of input current and output displacement within the working stroke by selecting appropriate magnetic separation ring structure and parameters. The rear part of the electromagnet 3 can be provided with an adjusting screw (not labeled in the figure, but the principle is mentioned), which can change the axial position of the pilot valve core 6, thereby adjusting the size of the throttle port and realizing the adjustment of the maximum flow.

[0048] II. Working principle

[0049] Initial state: under the pre-compression force of the return spring 5, the main valve core 4 is biased at the right end of the valve sleeve 1, at this time the main valve core 4 is limited by the stepped hole in the valve sleeve 1, the oil outlet 101 and the oil inlet 102 are in the closed state. At the same time, the spring seat one 7 and the spring seat two 8 bias the pilot valve core 6 at the left end of the valve sleeve 1 under the spring force of the pre-set spring 9.

[0050] Opening process: when the pressure oil enters from the oil inlet 102, the oil liquid acts on the side of the main valve core 4 through the radial hole of the valve sleeve 1. Since the diameter of the radial damping hole 402 is smaller than that of the axial damping hole 403, and the force of the return spring 5 is smaller, when the pressure oil enters the inside of the main valve core 4 through the radial damping hole 402 and then flows out from the axial damping hole 403 into the oil outlet 101, a pressure difference will be generated due to the size difference of the two damping holes. This pressure difference acts on the side of the main valve core 4, pushing the main valve core 4 to move to the left, thereby opening the sealing point between the main valve core 4 and the valve sleeve 1 inside, connecting the main oil circuit ② and ①, and allowing the oil liquid to flow from the oil inlet 101 to the oil outlet 102.

[0051] Flow regulation process: when the electromagnet 3 is energized, the electromagnetic force generated acts on the armature, and then acts on the pilot spool 6. When the electromagnetic force is greater than the spring force of the preset spring 9, the pilot spool 6 drives the spring seat two 8 to move to the right together, compressing the preset spring 9. As the electromagnetic force increases, the pilot spool 6 continues to move to the right, gradually approaching the axial damping hole 403 of the main spool 4, so that the flow area of the axial damping hole 403 gradually decreases. Due to the decrease of the flow area of the axial damping hole 403, the internal pressure of the main spool 4 gradually increases, thereby pushing the main spool 4 to move to the right, so that the passage between the oil outlet 101 and the oil inlet 102 gradually decreases, and the flow from the oil inlet 102 to the oil outlet 101 also gradually decreases.

[0052] Closing process: when the right end taper surface of the pilot spool 6 and the axial damping hole 403 are in complete contact and the axial damping hole 403 is closed, the oil entering from the radial damping hole 402 is completely sealed inside the main spool 4. At this time, the pressure oil acts on the left end surface of the main spool 4, completely pressing the main spool 4 to the step sealing hole inside the valve sleeve 1, and the oil inlet 102 to the oil outlet 101 is completely closed.

[0053] Flow regulation advantage:

[0054] Smooth closing at small flow: the structure of the throttle groove 401 at the front end of the main spool 4 makes the throttle area change present a double-slope characteristic. At large flow, the slope of the throttle area change is large, the flow gain is large, which can meet the requirement of passing large flow in the opening stage; at small flow, the slope of the throttle area change is small, the flow gain is small, so that the flow change is small in fast closing, and the closing process is more smooth, effectively reducing the pressure impact and motion impact of the system.

[0055] Adjustable maximum flow: by adjusting the screw at the rear of the electromagnet 3, the axial position of the pilot spool 6 is changed, and then the size of the throttle port is adjusted, so that the maximum flow of the valve can be adjusted to meet different working requirements.

[0056] More precise flow regulation: by using the same structure of the throttle groove 401 at the front end of the main spool 4 and only changing the flow area, different flow range requirements can be met within the same stroke of the main spool 4, so that more precise flow adjustment is realized, and the precision and stability of system control are improved.

[0057] It should be understood by those skilled in the art that the embodiments of the utility model shown in the above description and the drawings are only as examples and do not limit the utility model. The purpose of the utility model has been completely and effectively realized. The function and structural principle of the utility model have been shown and explained in the embodiments, and the embodiments of the utility model can have any deformation or modification without departing from the principle.

Claims

1. A two-way cone valve type directional valve characterized by, The utility model relates to a valve sleeve (1), screw sleeve (2) and electromagnet (3), the valve sleeve (1) rear end is connected screw sleeve (2) through thread, screw sleeve (2) rear end is connected electromagnet (3) through thread, forms detachable whole structure; The valve sleeve (1) side is equipped with oil inlet (102), and the front end face is equipped with oil outlet (101), and both form two-way structure; The valve sleeve (1) inside is equipped with stepped hole, and main valve core (4), reset spring (5) and pilot valve core (6) are arranged in large diameter hole in sequence, the right end surface of main valve core (4) is equipped with throttle groove (401), and the left end outer circle is formed dynamic seal with the clearance of valve sleeve (1) inner hole. The right end of valve sleeve (1) is equipped with first sealing structure (103), and the left end is equipped with external thread, and the radial through hole (104) is arranged between the external thread and first sealing structure (103), and the radial through hole (104) is connected with the large diameter hole of valve sleeve (1) and constitutes oil inlet (102), and oil outlet (101) is located in the front end small step hole of valve sleeve (1), to be used for the guide throttle hole of main valve core (4).

2. The two-way cone valve type directional valve according to claim 1, characterized in that: The right end of screw sleeve (2) is equipped with external thread and is connected with the internal thread of screw sleeve (2), the left end of screw sleeve (2) is equipped with internal thread and is connected with the external thread of electromagnet (3), and the electromagnet (3) is limited with screw sleeve (2) and is equipped with second sealing structure (201) between them.

3. The two-way cone valve directional valve of claim 1, wherein: The inner hole of the right end of electromagnet (3) is equipped with axially movable spring seat one (7) and spring seat two (8), a preset spring (9) is arranged between spring seat one (7) and spring seat two (8), the left end step of pilot valve core (6) is clamped in spring seat two (8), and the right end is inserted into the inner hole of main valve core (4), forming a pilot control oil circuit.

4. The two-way cone valve directional valve of claim 3, wherein: The main valve core (4) is equipped with two-stage damping structure, including radial damping hole (402) connected with oil inlet (102) and inner cavity of main valve core (4), and axial damping hole (403) connected with oil outlet (101) and inner cavity of main valve core (4).

5. The two-way cone valve directional valve of claim 1, wherein: The reset spring (5) is pre-pressed and installed between the main valve core (4) and the pilot valve core (6), and the pre-tightening force makes the main valve core (4) adhere to the step surface of the valve sleeve (1) in normal state, forming a normally closed state.

6. The two-way cone valve directional valve of claim 1, wherein: The spring seat two (8) and the inner hole of the electromagnet (3) adopt clearance fit, allowing the spring seat two (8) to drive the pilot valve core (6) to produce axial displacement when the electromagnet (3) is energized.

7. The two-way cone valve directional valve of claim 4, wherein: The right end surface of main valve core (4) and the step surface of valve sleeve (1) form a variable throttle gap, and the opening degree changes linearly with the current of electromagnet (3).

8. The two-way cone valve directional valve of claim 1, wherein: ​

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