External control type digital flow valve

Abstract

The utility model discloses an external control type digital flow valve which comprises a main valve body, an oil inlet pipeline and an oil outlet pipeline are arranged on the main valve body, a main valve sleeve is arranged in the oil inlet pipeline, a main valve element is arranged in the main valve sleeve, and an oil inlet and an oil outlet are formed in the main valve body. A pilot valve body is arranged on the main valve body, an oil discharging pipeline is arranged in the pilot valve body, a pilot valve element is arranged in the oil discharging pipeline through a pilot valve seat, a transmission lead screw is arranged at the rear end of the pilot valve element, and a stepping motor is arranged on the pilot valve body. The oil unloading pipeline is communicated with the inlet end of the oil inlet pipeline through the oil control pipeline, and the tail end of the oil inlet pipeline is communicated with the oil unloading pipeline; an oil control opening is formed in the main valve body. The external control port communicated with the oil control pipeline is arranged on the valve body, and the opening degree of the oil discharge pipeline is controlled from the outside, so that the pressure of the oil inlet pipeline is controlled, and the oil outlet quantity of the oil outlet is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to flow valve technical field more particularly to an external control type digital flow valve. BACKGROUND

[0002] In the field of industrial automation, hydraulic transmission and fluid control, as the core executive component, the control precision, corresponding speed and reliability of flow valve directly affect the performance of the system.

[0003] Traditional flow valve adopts mechanical adjustment, and realizes the adjustment of flow by changing the opening of valve port, but there are some limitations in the use process of the valve, for example: the mechanical structure is easy to be affected by wear and temperature drift, resulting in insufficient stability; analog signal control relies on complex feedback system, and dynamic response is difficult to meet the demand of high speed and high frequency scene.

[0004] In order to solve the defects of traditional valve, digital flow valve emerges as the times require, which directly drives the movement of valve core through digital signal, and realizes closed loop control combined with high precision sensor and microprocessor, but the existing digital flow valve relies on internal feedback in use, and the internal displacement or pressure sensor needs to be built in the valve body, resulting in complex structure and increased cost. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is to provide an external control type digital flow valve to solve the problems in the background art.

[0006] In order to solve the above technical problems, the technical scheme adopted by the utility model is as follows.

[0007] An external control type digital flow valve, comprising a main valve body, an oil inlet pipeline and an oil outlet pipeline are arranged in communication on the main valve body, a main valve sleeve is arranged in the oil inlet pipeline, a main valve core is arranged in the main valve sleeve, an oil inlet and an oil outlet are arranged on the main valve body and communicated with the oil inlet pipeline and the oil outlet pipeline respectively; a pilot valve body is arranged on the main valve body, a drain pipeline is arranged in the pilot valve body, a pilot valve core is arranged in the drain pipeline through a pilot valve seat, a drive screw is arranged at the rear end of the pilot valve core through a drive nut, and a stepping motor is arranged on the pilot valve body for driving the drive screw to rotate; the drain pipeline is communicated with the inlet end of the oil inlet pipeline through a control oil pipeline, and the end of the oil inlet pipeline is communicated with the drain pipeline; a control oil port is arranged on the main valve body and communicated with the control oil pipeline.

[0008] Further optimize the technical scheme, a damping screw for controlling the opening of the drain pipeline is arranged at the communication part of the drain pipeline and the control oil pipeline.

[0009] Further optimize the technical scheme, a damping screw for controlling the opening of the drain pipeline is arranged at the communication part of the drain pipeline and the control oil pipeline.

[0010] Further optimize technical scheme, the main valve spool is sleeved with the main valve spring for supporting the main valve spelm.

[0011] Further optimize technical scheme, the pilot valve spelm is sleeved with the pilot valve spring for supporting the pilot valve spelm.

[0012] Further optimize technical scheme, one side of the driving screw on the pilot valve body is provided with the valve cover through the gland.

[0013] Due to the adoption of the above technical scheme, the technical progress achieved by the utility model is as follows.

[0014] The utility model provides a kind of external control type digital flow valve, by being provided with oil control pipeline in valve body, oil in oil inlet pipeline flows into oil discharge pipeline by oil control pipeline, flows out by oil discharge pipeline, and external control port of oil control pipeline is provided on valve body, the opening of oil discharge pipeline is controlled from outside, so as to control the pressure of oil inlet pipeline, ensure the oil output of oil outlet. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the structural schematic diagram of the utility model;

[0016] Figure 2 It is the structural schematic diagram of the utility model Figure 1 Enlarged structural schematic diagram of place A in the utility model;

[0017] Figure 3 It is the principle diagram of the utility model.

[0018] Wherein: 1. main valve body, 2. main valve sleeve, 3. main valve spelm, 4. main valve spring, 5. oil inlet pipeline, 6. oil outlet pipeline, 7. pilot valve body, 8. valve cover, 9. pilot valve seat, 10. pilot valve spelm, 11. pilot valve spring, 12. transmission nut, 13. transmission screw, 14. gland, 15. step motor, 16. damping screw, 17. oil control pipeline, 18. oil discharge pipeline, X. external control port, P. oil inlet, T. oil outlet, L. oil outlet, M. step motor. DETAILED DESCRIPTION

[0019] The utility model will be further explained in detail in connection with drawing and specific embodiment.

[0020] An external control type digital flow valve is combined Figures 1 to 2 As shown in the figure, including main valve body 1 and pilot valve body 7, main valve body 1 is provided with the oil inlet pipeline 5 and oil outlet pipeline 6 of intercommunication, oil inlet pipeline 5 is provided with main valve sleeve 2, main valve sleeve 2 is provided with main valve spelm 3, main valve body 1 is provided with oil inlet and oil outlet, oil inlet is communicated with oil inlet pipeline 5, and oil outlet is communicated with oil outlet pipeline 6.

[0021] The main valve spool 3 is sleeved with a main valve spring 4 for supporting the main valve spool.

[0022] The main valve body 1 is communicated with the pilot valve body 7 through an oil control pipeline 17, and the main valve body 1 is provided with an oil control port communicated with the oil control pipeline 17.

[0023] The pilot valve body 7 is arranged on the main valve body 1, and the pilot valve body 7 is provided with an oil discharge pipeline 18, a pilot valve spool 10 arranged in the oil discharge pipeline through a pilot valve seat 9, a transmission screw 13 arranged at the rear end of the pilot valve spool 10 through a transmission nut 12, a valve cover 8 arranged on one side of the transmission screw on the pilot valve body 7 through a gland 14, and a stepping motor 15 arranged on the gland 14 and used for driving the transmission screw to rotate.

[0024] The pilot valve spool 10 is sleeved with a pilot valve spring 11 for supporting the pilot valve spool.

[0025] The oil discharge pipeline 18 is communicated with the inlet end of the oil inlet pipeline 5 through the oil control pipeline 17, and the outlet end of the oil inlet pipeline is communicated with the oil discharge pipeline 18; and the oil discharge pipeline 18 is provided with a damping screw 16 at the communicated position of the oil discharge pipeline and the oil control pipeline, so as to control the communication between the oil discharge pipeline and the oil control pipeline.

[0026] The communicated position of the oil inlet pipeline and the oil discharge pipeline 18 is provided with a damping screw, so as to control the communication between the oil inlet pipeline and the oil discharge pipeline.

[0027] The working principle diagram of the utility model is shown in the figure. Figure 3 The hydraulic oil enters from the oil inlet port P and is discharged from the oil outlet port T; the stepping motor M drives the transmission screw to rotate, drives the transmission nut to move forward and backward, drives the pilot valve spool to move forward and backward to the set position, opens a certain gap between the oil discharge pipeline and the oil control pipeline, and when the hydraulic oil in the oil inlet pipeline is more, the hydraulic oil in the oil inlet pipeline flows into the oil discharge pipeline through the oil control pipeline and is discharged through the oil discharge port L, so that the oil outlet amount of the oil outlet port is kept stable.

[0028] When the oil amount of the oil inlet pipeline is too much to be discharged from the oil discharge pipeline in time, the pressure of the oil inlet pipeline is too large, a certain amount of hydraulic oil is manually injected from the external control port X, the hydraulic oil enters the oil discharge pipeline from the oil control pipeline, pushes the damping screw in the oil discharge pipeline, increases the passage between the oil control pipeline and the oil discharge pipeline, pushes the damping screw at the rear end of the oil inlet pipeline, and the pressure of the oil inlet pipeline is discharged from the oil discharge pipeline, so that the hydraulic oil in the oil inlet pipeline can be smoothly discharged from the oil discharge pipeline, and the oil outlet amount of the oil outlet port is ensured.

Claims

1. An externally controlled digital flow valve, comprising a main valve body (1), wherein the main valve body (1) is provided with an inlet pipe (5) and an outlet pipe (6) connected to each other, a main valve sleeve (2) is provided inside the inlet pipe (5), a main valve core (3) is provided inside the main valve sleeve (2), and an inlet port and an outlet port are provided on the main valve body (1) respectively connected to the inlet pipe (5) and the outlet pipe (6); characterized in that: The main valve body (1) is provided with a pilot valve body (7), and an oil discharge pipeline (18) is provided inside the pilot valve body (7). A pilot valve core (10) is provided inside the oil discharge pipeline via a pilot valve seat (9). A transmission screw (13) is provided at the rear end of the pilot valve core (10) via a transmission nut (12). A stepper motor (15) for driving the transmission screw to rotate is provided on the pilot valve body (7). The oil discharge pipeline (18) is connected to the inlet end of the oil inlet pipeline (5) via an oil control pipeline (17). The end of the oil inlet pipeline is connected to the oil discharge pipeline (18). The main valve body (1) is provided with an oil control port that connects to the oil control pipeline (17).

2. The externally controlled digital flow valve according to claim 1, characterized in that: The oil unloading pipeline (18) is provided with a damping screw (16) at the connection point with the oil control pipeline (17) to control the opening of the oil unloading pipeline.

3. The externally controlled digital flow valve according to claim 1, characterized in that: A damping screw (16) for controlling the opening of the unloading pipeline is provided at the connection between the inside of the end of the oil inlet pipeline and the unloading pipeline (18).

4. The externally controlled digital flow valve according to claim 1, characterized in that: The main valve core (3) is fitted with a main valve spring (4) for supporting the main valve core.

5. The externally controlled digital flow valve according to claim 1, characterized in that: A pilot valve spring (11) for supporting the pilot valve core (10) is sleeved on the pilot valve core (10).

6. The externally controlled digital flow valve according to claim 1, characterized in that: A valve cover (8) is provided on one side of the transmission screw on the valve body (7) of the pilot valve via a pressure cover (14).

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