Valve element structure of variable-flow gain proportional valve and proportional valve

Abstract

The utility model belongs to the technical field of mechanical engineering, and discloses a variable flow valve which comprises a valve core rod and a plurality of convex shoulders arranged on the valve core rod, two pairs of flow windows are arranged on each convex shoulder, when the variable flow valve is used, a valve core is directly matched with a shell, different flow windows are arranged on the convex shoulders, and variable flow gain output of the valve can be achieved. When a small control signal is input into the valve, the working edge of the small groove of the valve element and the working edge opening of the shell achieve flow control, hydraulic power borne by the valve element at the position is small, and stability and control precision of a hydraulic system are improved. When a large control signal is input into the valve, the large groove working edge of the valve element and the working edge opening of the shell achieve flow control, the flow passing performance of the valve element at the position is good, and rapid movement of a hydraulic system is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to mechanical engineering technical field relates to a variable flow gain proportional valve spool structure form. BACKGROUND

[0002] Electro-hydraulic proportional valve is the key element in hydraulic control system, and the electro-hydraulic proportional valve driven by proportional electromagnet is most widely used.

[0003] The electro-hydraulic proportional valve driven by general proportional electromagnet is composed of shell, valve sleeve, spool, spring and electromagnet, the spool is matched with the valve sleeve gap, the relative displacement of valve sleeve and spool realizes the change of different flow windows, and then the LVDT displacement sensor feedback is realized to the system controller, realizes internal closed loop.This traditional proportional valve has good static and dynamic performance, accurate in position control system.

[0004] However, the valve sleeve and spool of this electro-hydraulic proportional valve need special machining process, and the price is extremely expensive. First, the valve sleeve and spool need special air test bench for machining and matching, the proportional valve overlap is determined according to the actual demand of the system, the working edge of the spool is ground by mechanical processing, and the machining is repeatedly measured to meet the overlap index;Secondly, the valve sleeve and spool are gap matched, and the machining precision is 0.001-0.005mm, which needs special mechanical matching and grinding process to meet the requirements;Finally, the oil leakage of valve sleeve sealing structure and the bruise of working edge are easy to cause the failure of electro-hydraulic proportional valve, which greatly increases the processing cost and labor cost. CONTENT OF THE UTILITY MODEL

[0005] In view of the defects of complex machining and high cost of valve sleeve and spool of existing electro-hydraulic proportional valve, the utility model aims at designing a variable flow gain proportional valve spool structure, the spool is matched with the shell directly, different flow grooves are set on the shoulder, and variable flow gain output of the valve can be realized.When the valve input small control signal, the small groove working edge of the spool and the shell working edge opening realize flow control, the spool is small in the position and the liquid power is small, the stability and control precision of the hydraulic system are improved;When the valve input large control signal, the large groove working edge of the spool and the shell working edge opening realize flow control, the spool is good in the position and the hydraulic system fast motion is improved.

[0006] The technical scheme of the utility model is as follows:

[0007] A variable flow gain proportional valve spool structure, comprising a spool rod and a plurality of shoulders arranged on the spool rod, two pairs of flow windows are opened on each shoulder.

[0008] Further, each flow window is a semicircular structure with different diameters.

[0009] Further, the flow window has two working edges, which are small groove working edge and large groove working edge.

[0010] Further, the small groove working edge and the large groove working edge size L, R are obtained by machining, and the roughness is 0.4.

[0011] Further, the unloading groove is further arranged on the outer circular surface of the shoulder.

[0012] Further, the size of the unloading groove is at least 10 times of the matching gap of the spool.

[0013] The spool is directly matched with the shell, windows of different flow rates are arranged on the shoulder, and variable flow rate gain output of the valve can be realized. Firstly, the special machining process of the valve sleeve and the spool can be avoided, and the machining cost and the labor cost are reduced; secondly, the small groove working edge of the spool has small working output flow rate, and the system stability is high; and the large groove working edge of the spool and the working edge opening of the shell realize large flow rate control, the system response speed is fast, and different requirements of the system are met.

[0014] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0015] 1. The spool of the utility model is directly matched with the shell, and the special machining process is not needed, so that the machining cost is reduced.

[0016] 2. The spool of the utility model is arranged with different flow rate grooves on the shoulder, and variable flow rate gain output of the valve can be realized.

[0017] 3. The structure of the spool valve stage of the utility model only processes the spool, the position of the small groove working edge and the large groove working edge and the flow rate window are changed by simple machining, and the flexibility of the flow rate is adapted. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the variable flow rate gain proportional valve spool structure schematic view of the utility model;

[0019] Figure 2 is the variable flow rate gain proportional valve spool structure appearance view of the utility model;

[0020] Figure 3 is the valve spool flow rate window local enlarged view of the utility model;

[0021] Figure 4 is the valve spool flow rate window plan view of the utility model;

[0022] Wherein: 1 is the spool rod, 2 is the shoulder, 3 is the flow rate window, 4 is the small groove working edge, 5 is the large groove working edge, and 6 is the unloading groove. DETAILED DESCRIPTION

[0023] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the utility model is described in detail below in combination with the drawings or specific implementation cases, and it should be noted that some (but not all) of the disclosed examples are shown in the drawings. In fact, many different examples can be described and these examples should not be understood as being limited to the examples set forth herein. On the contrary, these examples are described so that the positive effects of the utility model are more embodied, and the details not described herein are regarded as being known or conventional technical means in the art.

[0024] Referring to the accompanying Figures 1 to 4 The utility model discloses a variable flow gain proportional valve spool structure, including valve core stem 1, boss 2, flow window 3, small groove working edge 4, big groove working edge 5, unloading groove 6;

[0025] The valve core stem 1 is provided with multiple bosses 2, and two pairs of flow windows 3 are opened on the boss 2, and each flow window 3 is composed of two semicircles with different diameters.

[0026] The flow window 3 has two working edges, which are the small groove working edge 4 and the big groove working edge 5.

[0027] The boss 2 is provided with an unloading groove 6.

[0028] The size L of the small groove working edge 4 and the size R of the big groove working edge 5 are obtained by mechanical processing, and the roughness is 0.4.

[0029] The size of the unloading groove should be at least 10 times of the matching gap of the spool valve.

[0030] Embodiment 1

[0031] The utility model provides a variable flow gain proportional valve spool structure, including valve core stem, boss, flow window, small groove working edge, big groove working edge, unloading groove, the valve core is directly matched with the casing, and different flow grooves are set up on the boss, can realize the valve variable flow gain output. When the valve input small control signal, the valve core small groove working edge and the casing working edge opening realize flow control, and the valve core is small in the position and is subjected to liquid power, improves the stability and control precision of hydraulic system, when the valve input big control signal, the valve core big groove working edge and the casing working edge opening realize flow control, and the valve core is good in the position and is subjected to liquid power, improves the quick movement of hydraulic system.

[0032] Figure 1 、 Figure 2The utility model discloses a variable flow gain proportional valve spool structure schematic diagram and the appearance diagram. Spool directly cooperates with the casing, sets up different flow window on the convex shoulder, can realize that valve variable flow gain output. When valve input ±1mA, spool small groove working edge works, the casing working edge opening is only small groove working edge at this time, and spool is small in the position and is subjected to liquid power, and system stability is high, when valve input ±10mA, spool big groove working edge and casing working edge opening realize big flow control, and spool flow window is good in through-flow property at this time.

[0033] Figure 3 The utility model discloses a valve core flow window partial enlarged view. When system determines actuator operating speed demand, can calculate electro-hydraulic proportional valve flow, and can process in small groove working edge, big groove working edge of spool setting determines different L size, and initial operating speed 0.1m / s can work in small groove working edge, and machine L1 size is 0.8mm, and with the increase of motion speed, machine L2 increases to 2mm, and the flow window over flow gradually increases.

[0034] Figure 4 The utility model discloses a valve core flow window plan view. Valve core flow window is semicircular structure, and again sets up smaller diameter semicircle in larger diameter semicircle, and small groove working edge size R1 machine adds to 0.5mm, and oil liquid output flow 5L / min. Big groove working edge machine adds to 2mm, and oil liquid output flow reaches 40L / min maximum, and the utility model discloses any one valve core structure designed as above can be applied to proportional valve, especially suitable for variable flow gain proportional valve.

[0035] The above description of the embodiments is for facilitating the ordinary skilled person in the art to understand and apply the utility model. The person skilled in the art can obviously easily make various modifications to these embodiments, and apply the general principles explained herein to other embodiments without having to have creative labor. Therefore, the utility model is not limited to the embodiments here, and the improvements and modifications made by the person skilled in the art according to the disclosure of the utility model without departing from the scope of the utility model should be within the protection scope of the utility model.

Claims

1. A variable flow gain proportional valve spool structure, characterized by, The valve core rod comprises a plurality of convex shoulders, and each convex shoulder is provided with two pairs of flow windows. Each flow window is a semicircular structure with different diameters, and has two working edges, i.e., a small groove working edge and a large groove working edge.

2. A variable flow gain proportional valve spool structure as claimed in claim 1, wherein, The small groove working edge and the large groove working edge have sizes L and R, respectively, which are obtained by machining and have a roughness of 0.

4.

3. A variable flow gain proportional valve spool structure as defined in claim 2 wherein, An unloading groove is further arranged on the outer circular surface of the convex shoulder.

4. A proportional valve comprising a valve spool and a valve housing, characterized in that The size of the unloading groove is 10 times the matching gap of the slide valve. The valve core adopts the valve core structure according to any one of claims 1-3.

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