CN113153852B - Direction and flow combined type high-frequency response proportional rotary valve - Google Patents

Abstract

A direction and flow compound high-response proportional rotary valve, comprising a main motor, a secondary motor, end caps at both ends, a transmission cover, a valve seat, a valve sleeve, a valve core and left and right valve plates, and the valve core is installed on the valve sleeve The valve body is positioned and fastened with the bearing, the valve sleeve is connected with the transmission cover by bolts, the trapezoidal left and right threaded shafts are placed in the hollow structure inside the valve core, and the left-handed and right-handed trapezoidal threads are processed at both ends of the trapezoidal left and right threaded shafts, respectively. The valve plate is fitted and connected with the secondary motor. On the one hand, the present invention uses the servo motor as the driving element to realize the opening and closing of the valve port; The rotation of the valve sleeve reduces the rotational inertia of the mechanical part; the valve plates at both ends of the valve core ensure that the impact force of the axial oil can be effectively balanced when adjusting the flow; the inlet and outlet oil ports are symmetrically distributed to reduce the radial hydraulic torque of the valve body part and flow pulsation.

Description

A direction and flow compound high-response proportional rotary valve

technical field

The invention belongs to the field of high-frequency hydraulic valves, in particular to a high-frequency response proportional rotary valve with a combined direction and flow rate.

Background technique

Rotary electro-hydraulic proportional valve is a direct-acting single-stage valve whose power stage spool is directly driven by an electro-mechanical converter. However, compared with multi-stage valves, the frequency response of single-stage valves is not high and the output flow is low. In addition, due to the unbalanced radial force of the rotary valve, the required operating force of the rotary valve core is large, and the sealing performance is poor, so it is generally used in low pressure and small flow occasions, or as a pilot valve. Especially in the test equipment that requires high-frequency vibration, the actuating cylinder needs high-frequency and stable action. At present, imported high-frequency valves are used, which is expensive and limited. Therefore, the research and development of rotary proportional valves, especially single-stage, high-frequency, high-flow rotary electro-hydraulic proportional valves, is an important direction for the development of electro-hydraulic proportional valves. Frequency response ratio and great demand for servo valves.

SUMMARY OF THE INVENTION

In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a high-response proportional rotary valve with a combined direction and flow rate, using two AC servo motors as the driving elements of the valve, wherein the main motor is used to drive the valve sleeve Rotating, the secondary motor is used to adjust the position of the valve plate. The rotary valve is composed of two parts: the mechanical body and the motor control. The mechanical body part uses an AC servo motor as an electro-mechanical converter, and the valve core, valve plate and valve sleeve constitute the valve's action execution components. The rotary valve adopts a valve The core is static, the valve sleeve is connected with the motor output shaft to generate rotation, and the motor output shaft drives the valve sleeve to achieve high-frequency commutation and precise flow control; the screw mechanism is used to realize the symmetrical arrangement of the valve plate through the rotation of the secondary motor. The movement thus regulates the output flow of the valve.

For achieving the above object, the technical scheme provided by the present invention is:

A direction and flow compound high-response proportional rotary valve, comprising a main motor, a secondary motor, a left end cover, a right end cover, a transmission cover, a valve seat, a valve sleeve, a valve core, a trapezoidal left and right threaded shaft, a left valve plate, The right valve plate, deep groove ball bearing, and fixed bracket; the motor output shaft of the main motor is connected with the transmission cover plate through a keyway, and the transmission cover plate is connected with the valve sleeve through bolts, so as to transmit the rotary motion output by the main motor, and the valve sleeve is installed in the valve sleeve. Inside the valve seat, there are two through holes symmetrically distributed at 180° at every fixed axial length in the radial direction of the circumference, with a total of 8 through holes, that is, four groups of symmetrical oil ports; the inner cylindrical surface of the valve sleeve and the valve The outer cylindrical surface of the core is matched with the inner cylindrical surface of the valve seat. The valve core is installed inside the valve sleeve and is positioned and fastened by the valve seat and the deep groove ball bearing. The opening position of the valve seat is the same as that of the valve sleeve. There are four groups of 8 blind holes in each group on the cylindrical surface of the valve core, a total of 32 blind holes in the radial direction; the axial positions of the four groups of holes are the same as the valve seat and the valve sleeve, and eight symmetrically distributed in the radial direction. The ends of each hole communicate with the other three groups through eight internal flow channels in the axial direction; two pairs of deep groove ball bearings are connected between the valve core and the valve sleeve; the inside of the valve core is a hollow structure with trapezoidal left and right threaded shafts, trapezoidal The left and right threaded shafts are respectively machined with left-handed trapezoidal threads and right-handed trapezoidal threads at both ends of the shaft. The left end installation part of the threaded shaft is connected with the motor output shaft of the secondary motor through a flat key; the secondary motor is fixed with the left end cover by the first bolt and the second bolt, and there is a face-to-face installation between the left end cover and the trapezoidal left and right threaded shafts. The pair of angular contact ball bearings are respectively the first angular contact ball bearing and the second angular contact ball bearing; the left end cover, the valve seat and the valve core are connected and fastened with the fixing bracket by bolts.

Further, the valve sleeve is provided with four groups of two through holes equidistant in the axial direction and symmetrically distributed at every 45° in the radial direction; the opening position of the valve seat is the same as that of the valve sleeve, that is, the diameter The two upward holes are symmetrically distributed at 180°, and the symmetrical holes in each row of axial direction are at the same distance and 45° apart. mouth B.

Further, on the outer cylindrical surface of the valve sleeve, there are annular grooves with a certain depth outside the holes in the radial direction, so that each annular groove communicates with the oil port of the valve seat. When the valve sleeve rotates, it does not need to be rotated to Only when the oil port on the valve seat is positioned, the outer oil port is communicated with the valve core to speed up the response process.

Further, there are four groups of 8 blind holes in each group on the cylindrical surface of the valve core, totaling 32 blind holes in the radial direction, wherein the axial positions of the four groups of holes are the same as the valve seat and the valve sleeve; The ends of the eight holes symmetrically distributed upwards all communicate with the other three groups through eight internal flow channels in the axial direction.

Further, the two ends of the valve core, the left valve plate and the right valve plate form four independent fan-shaped cavities through cross-shaped grooves. When the oil enters and the valve sleeve rotates through a certain angle, it enters the valve cavity and communicates with each other. The oil port is changed to realize the reversal of the hydraulic oil circuit.

Further, the deep groove ball bearing is installed between the valve seat and the valve sleeve to bear the radial load of the valve body of the rotary valve and a certain bidirectional axial load; the first angular contact ball bearing, the second angular contact ball Bearings Bearings are installed between the trapezoidal left and right threaded shafts and the left end cover and bear the axial and radial loads on the threaded shafts; the valve body of the rotary valve is fixed by bolts, and the transmission cover plate and the valve sleeve are connected by socket head cap screws .

Compared with the prior art, the beneficial effects of the present invention are:

On the one hand, the rotary valve of the present invention uses the servo motor as the driving element to realize the opening and closing of the valve port, and on the other hand, realizes the function of high frequency commutation and the adjustment of the flow rate through the cooperation of the valve sleeve, the valve core and the valve plate. In the case of increasing the working frequency of the hydraulic valve, the valve sleeve rotation method is cleverly adopted, which effectively reduces the rotational inertia of the mechanical part; the valve plates symmetrically arranged at both ends of the valve core are used to balance the impact of the axial oil when adjusting the flow rate. Through the symmetrical distribution of the inlet and outlet oil ports, the radial hydraulic torque of the valve body part and the flow pulsation phenomenon are reduced.

Compared with the existing technology, the present invention proposes a rotary valve structure, the main servo motor drives the valve sleeve to rotate at a constant speed, the size of the flow area formed by the cooperation of the valve sleeve and the valve core changes periodically, and the flow rate of the oil entering and leaving the reversing valve changes periodically. The size and direction also change periodically. The symmetrical design of the 8 oil ports and the flow passage can greatly improve the reversing frequency of the rotary valve. Whenever the servo motor drives the valve sleeve to make one revolution, the rotary valve actually performs four reversing cycles. An annular groove of a certain depth is opened on the outside of the outer cylindrical hole of the valve sleeve, so that each annular groove communicates with the oil port of the valve seat. When the valve sleeve rotates, it is not necessary to rotate to the oil port position on the valve seat. It communicates with the spool to speed up the response process.

When the secondary motor rotates, the left and right valve plates are connected with the threaded shaft through the threaded connection, and the threaded shaft performs opposite or opposite linear motions. From the schematic diagram of the rotary valve structure shown in Figure 1, it can be seen that the valve sleeve is the main rotating component, and it maintains contact with the cylindrical surface of the valve body and the valve core during the rotation process. Therefore, the outer cylindrical surface of the valve core and the outer cylindrical surface of the valve sleeve Pressure equalizing grooves are machined on the surface to improve mechanical seal performance and better balance radial hydraulic power.

Description of drawings

FIG. 1 is a schematic structural diagram of the high-response proportional rotary valve of the combined direction and flow rate of the present invention.

Figure 2 is a schematic diagram of a hydraulic graphic symbol of the present invention.

Fig. 3 is a schematic view of the structure of the valve sleeve in the present invention, wherein (a) is a front view, and (b) is a cross-sectional view of A-A of (a).

Figure 4 is a schematic diagram of the structure of the flow channel in the present invention.

Fig. 5 is the working principle diagram of the rotary valve of the present invention, wherein (a) is the initial position of the flow channel, (b) is the position of the flow channel after the valve sleeve is rotated through a fixed angle.

Figure 6 is the adjustment diagram of the height of the distribution chambers at both ends of the left and right valve plates and the trapezoidal left and right threaded shafts, wherein (a) is the initial position of the distribution chamber, and (b) is the adjusted position of the distribution chamber.

Detailed ways

The above-mentioned content of the present invention will be described in further detail below through the form of examples, but it should not be understood that the scope of the above-mentioned subject matter of the present invention is limited to the following examples, and all technologies realized based on the above-mentioned content of the present invention belong to the present invention. scope of invention.

The orientation or positional relationship indicated by “upper, lower, inner and outer” in the terminology is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying what is indicated. A device or element must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. Terms such as "installation, connection, connection" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or an indirect connection through an intermediate medium, or It can be a communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

In the embodiment, as shown in Figure 1, a direction and flow compound high-response proportional rotary valve includes a main motor 11, a secondary motor 1, a left end cover 20, a right end cover 8, a transmission cover 9, a valve seat 5, Valve sleeve 6, valve core 2, trapezoidal left and right threaded shaft 27, left valve plate 3, right valve plate 7, deep groove ball bearing 4, fixed bracket 10, etc., wherein the motor output shaft of the main motor 11 and the transmission cover plate 9 pass through the keyway 12 is connected, the transmission cover plate 9 is connected with the valve sleeve 6 through bolts, so as to transmit the rotary motion output by the main motor. Two symmetrically distributed through holes, a total of 8 through holes, namely four sets of symmetrical oil ports, the inner cylindrical surface of the valve sleeve 6 is matched with the outer cylindrical surface of the valve core 2, and the outer cylindrical surface is matched with the inner cylindrical surface of the valve seat 5. The valve core 2 is installed inside the valve sleeve 6 and is positioned and fastened with the deep groove ball bearing 4 through the valve seat 5. The opening position of the valve seat 5 is the same as that of the valve sleeve. The cylindrical surface of the valve core 2 has four groups of each Groups of 8, a total of 32 blind holes in the radial direction, of which the axial positions of the four groups of holes are the same as the valve seat 5 and the valve sleeve 6, and the ends of the eight holes symmetrically distributed in the radial direction are the same as the other three. The groups pass through eight internal flow passages in the axial direction. Two pairs of deep groove ball bearings 4 are connected between the valve core 2 and the valve sleeve 6. The inside of the valve core 2 is a hollow structure where trapezoidal left and right threaded shafts 27 are placed. The trapezoidal left and right threaded shafts 27 are respectively machined with left-handed and right-handed trapezoidal threads at both ends of the shaft, and the threaded parts are matched with the left valve plate 3 and the right valve plate 7 respectively. Installation, the left end installation part of the trapezoidal left and right threaded shaft 27 is connected with the motor output shaft of the secondary motor 1 through the flat key 26, and the secondary motor 1 is fixed with the left end cover 20 by the first bolt 21 and the second bolt 22. A pair of angular contact ball bearings installed face to face are connected between 20 and the trapezoidal left and right threaded shafts 27 , which are a first angular contact ball bearing 23 and a second angular contact ball bearing 24 . The left end cover 20 , the valve seat 5 and the valve core 2 are connected and fastened to the fixing bracket 10 by bolts.

In the embodiment, the valve sleeve 6 is provided with four groups of two through holes that are equidistant in the axial direction and symmetrically distributed at intervals of 45° in the radial direction. The opening position of the valve seat 5 is the same as that of the valve sleeve 6, that is, the two holes in the radial direction are symmetrically distributed at 180°, and the symmetrical holes in each row are at the same distance and 45° apart. Port P, external port T, external port A, external port B.

In the embodiment, on the outer cylindrical surface of the valve sleeve 6, there are annular grooves with a certain depth outside the holes in the radial direction, so that each annular groove is communicated with the oil port of the valve seat. When the valve sleeve 6 rotates, there is no need to rotate. When the oil port on the valve seat 5 is reached, the outer oil port is communicated with the valve core 2, which speeds up the response process.

In the embodiment, the cylindrical surface of the valve core 2 is provided with four groups of 8 blind holes in each group, totaling 32 blind holes in the radial direction, wherein the axial positions of the four groups of holes are the same as the valve seat 5 and the valve sleeve 6 . And the ends of the eight holes symmetrically distributed in the radial direction all communicate with the other three groups through the eight internal flow channels in the axial direction.

As a preferred solution, the two ends of the valve core 2, the left valve plate 3 and the right valve plate 7 form four independent fan-shaped cavities through the cross-shaped grooves. When the oil enters and the valve sleeve 6 rotates through a certain angle, the valve enters the valve. The oil ports connected to the chambers are changed to realize the reversal of the hydraulic oil circuit.

In the embodiment, the deep groove ball bearing 4 is installed between the valve seat 5 and the valve sleeve 6 to bear the radial load of the valve body and a certain bidirectional axial load. The first angular contact ball bearing 23 and the second angular contact ball bearing 24 are installed between the trapezoidal left and right threaded shafts 27 and the left end cover 20, and simultaneously bear the axial and radial loads on the threaded shafts. The valve body is fixed by bolts, and the transmission cover 9 and the valve sleeve 6 are connected by hexagon socket screws.

In the rotary valve structure proposed by the present invention, the main servo motor drives the valve sleeve to rotate at a constant speed, the size of the flow area formed by the cooperation of the valve sleeve and the valve core changes periodically, and the flow size and direction of the oil entering and leaving the reversing valve also follow. cyclical changes. The symmetrical design of the 8 oil ports and the flow passage can greatly improve the reversing frequency of the rotary valve. When the servo motor drives the valve sleeve to make one revolution, the rotary valve actually performs four reversing cycles.

The working principle of the present invention is:

When the main motor rotates, take the P port and A port connected to the oil inlet and the B port and the T port connected to the oil return as an example, (a), (b), (c), (d) shown in Figure 4 are respectively The flow diagram of the valve body on the four sections of P port, T port, A port and B port. The left side of each picture is an axial cross-sectional view, and the right side is a radial cross-sectional view. The black arrow in the figure is the hydraulic oil in the flow channel. direction.

The two ends of the valve core 2, the left valve plate 3 and the right valve plate 7 form four independent fan-shaped cavities through the cross-shaped grooves. When the oil enters, as shown on the left side of Figure 5, when the valve sleeve rotates through a certain angle, The oil ports that enter the valve cavity and communicate with each other are changed, as shown on the right side of Figure 3, so as to realize the reversal of the hydraulic oil circuit.

The opening position of the valve sleeve 6 is the same as that of the valve seat, that is, the two holes in the radial direction are symmetrically distributed at 180°, and the symmetrical holes in each row in the axial direction are at the same distance and 45° as shown in Figure 3. On the outer cylindrical surface of the valve sleeve, an annular groove of a certain depth is opened on the outside of the radial hole, as shown in Figure 4 (a), so that each annular groove communicates with the valve seat oil port. When the valve sleeve rotates When it is not necessary to rotate to the position of the oil port on the valve seat, the outer oil port can be communicated with the valve core, which speeds up the response process.

The main motor M1 controls the commutation of the valve body and the flow characteristics of the valve port, and the secondary motor M2 realizes the change of the valve port flow by adjusting the position of the valve plate.

From Figure 4, it can be seen that the hydraulic oil enters the valve seat, valve sleeve and valve core from the radial direction, and then enters the distribution chamber composed of the valve core and the valve plate from the inside of the valve core along the axial circular flow channel. The two ends of the valve core and the valve plate form four independent fan-shaped cavities through the cross-shaped grooves. When the oil enters, as shown on the left side of Figure 5, when the valve sleeve rotates through a certain angle, it enters the oil port connected to the valve cavity. Change, that is, as shown on the right side of Figure 5, so as to realize the reversal of the hydraulic oil circuit.

The height adjustment of the left and right valve plates and the trapezoidal left and right threaded shafts on the distribution chambers at both ends is shown in Figure 6. When the left and right valve plates move toward each other on the threaded shaft, the height of the distribution chambers decreases, and when they move in the opposite direction, the height of the distribution chambers increases as shown in Figure 6 shown on the right. The valve port flow can be adjusted by changing the height of the distribution chamber through the secondary motor.

In order to reduce the manufacturing and maintenance costs in the case of high pressure and large flow, the rotary valve proposed by the present invention selects a permanent magnet synchronous AC proportional motor as the main and secondary drive elements, and adopts symmetrical valve ports and multi-channel distribution in the valve body structure. , so that the operating frequency of the rotary valve is increased to four times the motor speed. In the main work, only the valve sleeve rotates at high speed, which reduces the moment of inertia and energy consumption of the system. Therefore, the rotary valve is mainly composed of two parts, namely the mechanical structure part of the valve body and the main and secondary drive motor parts.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any form. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, according to the technical essence of the present invention, Any simple modifications, equivalent replacements and improvements made in the above embodiments still fall within the protection scope of the technical solutions of the present invention.

Claims (4)

1. A direction and flow compound high-response proportional rotary valve, characterized in that it comprises a main motor (11), a secondary motor (1), a left end cover (20), a right end cover (8), a transmission cover ( 9), valve seat (5), valve sleeve (6), valve core (2), trapezoidal left and right threaded shaft (27), left valve plate (3), right valve plate (7), deep groove ball bearing (4) , Fixed bracket (10); wherein the motor output shaft of the main motor (11) is connected with the transmission cover plate (9) through the keyway (12), and the transmission cover plate (9) is connected with the valve sleeve (6) through bolts, thereby transmitting the main The rotary motion of the motor output, the valve sleeve (6) is installed inside the valve seat (5), and there are two through holes symmetrically distributed at 180° at every fixed axial length in the radial direction of the circumference, a total of 8 through holes, That is, four sets of symmetrical oil ports; the inner cylindrical surface of the valve sleeve (6) is matched with the outer cylindrical surface of the valve core (2), and the outer cylindrical surface of the valve sleeve (6) is matched with the inner cylindrical surface of the valve seat (5). The valve core (2) is installed inside the valve sleeve (6) and is positioned and fastened by the valve seat (5) and the deep groove ball bearing (4). The opening position of the valve seat (5) is the same as the valve sleeve, and the valve core (2) ) are provided with four groups of 8 blind holes in each group, totaling 32 blind holes in the radial direction; the axial positions of the four groups of holes are the same as those of the valve seat (5) and the valve sleeve (6), and the diameter of the holes is the same as that of the valve seat (5) and the valve sleeve (6). The ends of the eight holes that are symmetrically distributed upwards all communicate with the other three groups through eight internal flow passages in the axial direction; two pairs of deep groove ball bearings (4) are connected between the valve core (2) and the valve sleeve (6). ; The inside of the valve core (2) is a hollow structure where the trapezoidal left and right threaded shafts (27) are placed, and the left and right threaded shafts (27) of the trapezoid are respectively machined with left-handed trapezoidal threads and right-handed trapezoidal threads at both ends of the shaft, and left-handed trapezoidal threads. It is installed in cooperation with the left valve plate (3), and the right-handed trapezoidal thread is installed in cooperation with the right valve plate (7). 1) is connected to the motor output shaft; the secondary motor (1) is fixed with the left end cover (20) by the first bolt (21) and the second bolt (22), and the left end cover (20) is connected with the trapezoidal left and right threaded shaft ( 27) is connected with a pair of angular contact ball bearings installed face to face, namely the first angular contact ball bearing (23), the second angular contact ball bearing (24); the left end cover (20), the valve seat (5) and the valve The core (2) is connected and fastened with the fixing bracket (10) by bolts; the valve sleeve (6) is provided with four groups of two through holes equidistant in the axial direction and symmetrically distributed at intervals of 45° in the radial direction ; The opening position of the valve seat (5) is the same as that of the valve sleeve (6), that is, the two holes in the radial direction are symmetrically distributed at 180°, and the symmetrical holes in each row of the axial direction are at the same distance and at intervals of 45°. The symmetrical holes are respectively an external oil port P, an external oil port T, an external oil port A, and an external oil port B; on the outer cylindrical surface of the valve sleeve (6), a ring shape with a certain depth is opened on the outer side of the radial hole. so that each annular groove communicates with the valve seat oil port. When the valve sleeve (6) rotates, it is not necessary to rotate to the oil port position on the valve seat (5) to make the outer oil port and the valve core (2). ) to speed up the response process. 2. The direction and flow compound type high-response proportional rotary valve according to claim 1, characterized in that: there are four groups of 8 in each group on the cylindrical surface of the valve core (2), a total of 32 radial Blind holes in the direction, wherein the axial positions of the four groups of holes are the same as the valve seat (5) and the valve sleeve (6); and the ends of the eight holes symmetrically distributed in the radial direction are all in the axial direction with the other three groups. Pass through eight internal flow channels. 3. The direction and flow compound type high-response proportional rotary valve according to claim 1, characterized in that: the two ends of the valve core (2) and the left valve plate (3) and the right valve plate pass through the cross shaped groove Four independent fan-shaped cavities are formed. When the oil enters and the valve sleeve rotates through a certain angle, the oil ports connected to the valve cavity change to realize the reversal of the hydraulic oil circuit. 4. The direction and flow compound high-response proportional rotary valve according to claim 1, characterized in that: the deep groove ball bearing (4) is installed between the valve seat (5) and the valve sleeve (6) , to bear the radial load of the rotary valve body and a certain bidirectional axial load; the first angular contact ball bearing (23) and the second angular contact ball bearing (24) are installed on the trapezoidal left and right threaded shaft (27) and the left end cover (20) bear axial and radial loads on the threaded shaft at the same time; the valve body of the rotary valve is fixed by bolts, and the transmission cover plate (9) and the valve sleeve (6) are connected by hexagon socket screws.

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