Pilot type fluid distributor

Abstract

The present invention provides a pilot type fluid distributor, comprising an electronic control unit (1), at least two solenoid valves (2), a pilot line (3) connected to the solenoid valves, a pilot valve (4) connected to the pilot line, a fluid branch line (5) connected to the pilot valve, a fluid main line (6) connected to the fluid branch line, the pilot valve is provided with a piston (4.1), and is characterized in that: the solenoid valve controls the on-off of the pilot line, the pilot fluid in the pilot line controls the on-off of the pilot valve, the pilot valve controls the on-off of the fluid branch line, and the on-off of each solenoid valve is independent of each other and is completely controlled by the program instructions of the electronic control unit. The entire system has a simple structure, reliable operation, and low manufacturing and operation costs.

Description

Technical Field

[0001] The invention relates to a fluid distributor, in particular to a pilot type fluid distributor controlled by a solenoid valve. Background Art

[0002] The solenoid valve controlled fluid distributor has the characteristics of simple structure, precise control, and online remote control. However, in the existing solenoid valve controlled fluid distributor, the solenoid valve is directly arranged in the working fluid pipeline, and the working fluid flows through the internal channel of the solenoid valve. Therefore, the properties of the working fluid have a great influence on the reliability and stability of the solenoid valve. When the working fluid has a large pressure, the solenoid valve is required to have high power and high rigidity, which results in high energy consumption and high manufacturing cost of the solenoid valve; when the working fluid has a large flow rate, the solenoid valve is required to have a large channel, which results in a large size of the solenoid valve and increased production costs; when the working fluid is entrained and transported with solids, it is very easy to cause the solenoid valve to close loosely and fail due to wear. For this reason, it is necessary to propose a solenoid valve controlled fluid distributor with further improved structure and performance. Summary of the invention

[0003] The object of the present invention is to provide a solenoid valve-controlled pilot fluid distributor with simple structure, easy manufacture, convenient use and good performance in view of the above problems.

[0004] In order to solve the above-mentioned problems, the inventors of the present invention conducted an in-depth study on the existing fluid distributor structure, and found that in the existing solenoid valve-controlled fluid distributor system, adding a pilot valve and a pilot line and separating the solenoid valve and the working fluid are excellent solutions to the above-mentioned problems, thereby realizing the present invention.

[0005] The objective of the present invention is achieved through the following technical scheme: a pilot-type fluid distributor, comprising an electronic control unit, at least two solenoid valves, a pilot line connected to the solenoid valve, a pilot valve connected to the pilot line, a fluid branch line connected to the pilot valve, a fluid main line connected to the fluid branch line, and a pilot valve provided with a piston, characterized in that: the solenoid valve controls the on-off of the pilot line, the pilot fluid in the pilot line controls the on-off of the pilot valve, the pilot valve controls the on-off of the fluid branch line, and the on-off of each solenoid valve is independent of each other and is completely controlled by the program instructions of the electronic control unit.

[0006] Furthermore, the opening times of the solenoid valves overlap.

[0007] Furthermore, the opening times of the solenoid valves do not overlap.

[0008] Furthermore, an elastic element is also provided in the pilot valve.

[0009] Furthermore, the position of the pilot valve piston is completely controlled by the solenoid valve.

[0010] Furthermore, the position of the pilot valve piston is controlled by a solenoid valve and an elastic element.

[0011] The specific operation process of the pilot type fluid distributor of the present invention is: the solenoid valve receives the instruction of the electronic control unit, opens the pilot pipeline channel, the pilot fluid enters the pilot valve, pushes the pilot valve piston to open the fluid branch pipeline, and the working fluid enters the fluid branch pipeline from the fluid main pipeline.

[0012] Compared with the prior art, the pilot-type fluid distributor of the present invention has the following advantages: the solenoid valve directly controls the clean low-pressure fluid in the pilot line, the working fluid is controlled by the pilot valve, and the structural form of the solenoid valve is not affected by the characteristics of the working fluid. Therefore, a small solenoid valve can be used to control a working fluid with a large flow rate, high pressure, and the ability to transport solid debris. The entire system has a simple structure, reliable operation, and low manufacturing and operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of embodiment 1 of the present invention.

[0014] Figure 2 It is a structural diagram of embodiment 2 of the present invention. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0016] Example 1: See attached Figure 1 The pilot type fluid distributor is mainly provided with an electronic control unit 1, three solenoid valves 2, a pilot line 3 connected to the solenoid valves, a pilot valve 4 connected to the pilot line, a fluid branch line 5 connected to the pilot valve, a fluid main line 6 connected to the fluid branch line, and a piston 4.1 provided in the pilot valve. The specific operation process is as follows: the electronic control unit issues an instruction, the A port of the left solenoid valve and the middle solenoid valve is opened, and the B port is closed. The pistons in the left pilot valve and the middle pilot valve are pushed by the pilot fluid to move to the right position of the pilot valve, the fluid branch line is in a connected state, and the working fluid enters the corresponding branch line from the main line; at the same time, the A port of the right solenoid valve is closed, and the B port is opened. The piston in the right pilot valve is pushed by the pilot fluid to move to the left position of the pilot valve, the right fluid branch line is in a disconnected state, and the working fluid cannot enter the right branch line.

[0017] Example 2: See attached Figure 2Compared with Example 1, an elastic element 4.2 is additionally provided in the pilot valve, and the specific operation process is as follows: the electronic control unit issues a command, the A port of the left solenoid valve is opened, and the piston in the left pilot valve is pushed by the pilot fluid to move to the right position of the pilot valve, the left fluid branch pipeline is in a connected state, and the working fluid enters the left branch pipeline from the main pipeline; at the same time, the A ports of the middle solenoid valve and the right solenoid valve are closed, and the pistons in the middle pilot valve and the right pilot valve are pushed by the elastic element to move to the left position of the pilot valve, the corresponding fluid branch pipeline is in a disconnected state, and the working fluid cannot enter the corresponding branch pipeline.

[0018] Although the present invention has been described in detail using specific embodiments, it will be apparent to those skilled in the art that various changes can be made without departing from the spirit and scope of the present invention.

Claims

1. A pilot-type fluid distributor, comprising an electronic control unit (1), at least two solenoid valves (2), a pilot line (3) connected to the solenoid valves, a pilot valve (4) connected to the pilot line, a fluid branch line (5) connected to the pilot valve, a fluid main line (6) connected to the fluid branch line, the pilot valve being provided with a piston (4.1), characterized in that: The solenoid valve and the pilot line control the flow of the pilot fluid, and the pilot valve, the fluid main line and the fluid branch line control the flow of the working fluid; the pilot fluid and the working fluid are two different fluids and are not connected to each other; the solenoid valve controls the on-off of the pilot line, the pilot fluid in the pilot line controls the on-off of the pilot valve, and the pilot valve controls the on-off of the fluid branch line. The on-off of each solenoid valve is independent of each other and is completely controlled by the program instructions of the electronic control unit.

2. The pilot type fluid distributor according to claim 1, characterized in that: The opening times of the solenoid valves overlap.

3. The pilot type fluid distributor according to claim 1, characterized in that: The opening times of the various solenoid valves do not overlap.

4. The pilot type fluid distributor according to claim 1, characterized in that: An elastic element (4.2) is also provided in the pilot valve.

5. The pilot type fluid distributor according to claim 1, characterized in that: The position of the pilot valve piston is completely controlled by the solenoid valve.

6. The pilot type fluid distributor according to claim 1, characterized in that: The position of the pilot valve piston is controlled by the solenoid valve and the elastic element.

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