CN102619801B - Pure water two-way opposed piezoelectric ceramic reversing valve - Google Patents

Abstract

The invention discloses a pure water bidirectional opposed piezoelectric ceramic reversing valve which comprises two opposed piezoelectric ceramic drivers, a spherical valve core arranged in an inner hole of a valve body, a return spring, a spring push rod and other mechanisms. The upper end of the valve body is provided with a water inlet, a working port and a water return port which are communicated with each other; the ceramic ball is separated from or jointed with the valve seat to form the opening or closing of the loop, so that the direction of the liquid flow is changed to realize the required liquid path reversing action. Zero leakage can be realized through direct sealing between the valve core and the valve sleeve, between the valve sleeve and the valve body and linear sealing between the ceramic ball valve core and the valve seat; a valve port damper is additionally arranged to improve the dynamic and static performances of the reversing valve; the piezoelectric ceramic driver with large output force is used for realizing rapid switching; the valve also has the characteristics of good universality and convenience for standardization, and is particularly suitable for working in the aqueous medium environment with small flow, high response and stronger electromagnetic field action.

Description

Pure water two-way opposed piezoelectric ceramic reversing valve

technical field

The invention relates to valves, in particular to a pure water two-way opposing piezoelectric ceramic reversing valve.

Background technique

Due to its unique advantages of environmental protection and flame retardancy, pure water hydraulic technology is being widely valued by hydraulic circles all over the world, and pure water hydraulic components have also become one of the key research contents. The reversing valve is one of the most critical valve components in the hydraulic system, and the research on the reversing valve suitable for the pure water hydraulic system has also become a research focus.

Most of the traditional hydraulic directional valves are slide valve, rotary valve or cone valve. The unbalanced force on the spool of the slide valve type and rotary valve type reversing valve is very small, and the required operating force is also small, but there must be a gap for relative movement between the spool and the valve hole, and the leakage is often large. Especially for water medium, the low viscosity of water will increase the leakage loss. When the gap and pressure difference are the same, the leakage loss of the hydraulic reversing valve of the same specification is dozens of times that of the hydraulic reversing valve. Therefore, in order to reduce the leakage, the gap must be designed very small, which will inevitably bring great difficulties to the processing, and at the same time, blockage and jamming will easily occur when the kinematic pair is working. The leakage of the cone valve type reversing valve is very small, but the axial hydraulic pressure on the valve core is unbalanced, and the required operating force is also relatively large. In addition, due to the low compressibility and high rigidity of water, the pressure shock generated when the pure water reversing valve is switched suddenly is more serious.

In addition, the high vaporization pressure of water makes water very easy to vaporize and boil. Therefore, under the same conditions, the degree of cavitation damage suffered by pure water reversing valves is hundreds of times stronger than that of oil pressure reversing valves; compared with mineral oil, The water medium is very corrosive, and the destruction of the corrosion effect makes the existing oil pressure reversing valve materials unsuitable for the water medium.

Therefore, how to prevent leakage, reduce reversing impact, reduce corrosion, effectively suppress cavitation, and improve static and dynamic characteristics has become the key to the research of pure water reversing valves.

At present, the main research methods of pure water reversing valve are mainly as follows:

The first is to use the cone valve structure. This type of valve consists of two sets of main cone valves symmetrically installed on the valve body, two pilot control valves designed as end cover flanges and two one-way controllable cone valves. This type of valve has strong flow capacity and good anti-cavitation performance. However, due to the influence of machining accuracy, it cannot completely overcome the axial unbalanced pressure, and the required operating force is also relatively large.

The second is the use of slide valve structure. In order to reduce the leakage, this type of valve designs a very small fit gap between the valve core and the valve sleeve. Such a small gap puts forward very strict requirements on the processing technology of the valve, which greatly increases the processing difficulty and cost. . In addition, such a small gap is also easily blocked by impurities, so its application is greatly limited.

However, most of the existing water hydraulic components are driven by electromagnetism, which consume a large amount of holding current during the working process. If a piezoelectric ceramic driver with high conversion efficiency of electrical energy to mechanical energy, high energy transmission density, and fast response speed is used, not only It can reduce the cost of water hydraulic components, save the holding current, greatly save energy consumption, and improve the slow response speed of the traditional electromagnetic drive; and the existing electromagnetic drive is significantly disturbed by the external electromagnetic field, but the piezoelectric ceramic drive is in the During the working process, it is not disturbed by the external electromagnetic field, so it can improve the deficiency of the existing electromagnetic drive in the aspect of electromagnetic anti-interference.

Japanese researchers have developed a single-stage direct-acting servo valve directly driven by a laminated piezoelectric driver. The spool of the valve is directly driven by a multilayer piezoelectric driver, and the spool has displacement feedback to realize closed-loop control. However, the output displacement of the piezoelectric driver is very small, and it can only control a very small flow rate, and the inherent hysteresis of the piezoelectric material The effect is large and the repeatability is poor, which limits the application and development of piezoelectric servo valves.

Contents of the invention

The purpose of the present invention is to provide a pure water two-way opposed piezoelectric ceramic reversing valve, which is used to control the switching of the liquid flow circuit, realize no leakage, reduce cavitation, corrosion and other phenomena, improve response speed, and improve electromagnetic anti-interference High performance and low power consumption, suitable for water medium environment with small flow, high response and strong electromagnetic field.

The technical solution adopted by the present invention to solve its technical problems is:

The pure water two-way opposed piezoelectric ceramic reversing valve includes an outer fixed valve sleeve, a valve body and a fixed nut. The outer fixed valve sleeve includes the outer fixed valve sleeve I and the outer fixed valve respectively fixed at the left and right ends of the valve body axially. Sleeve II; the fixed nut includes, the nut I fixed on the left end of the outer fixed valve sleeve I axially and the nut II fixed on the right end of the outer fixed valve sleeve II; To the right, a two-hole valve sleeve with a set of through holes in the radial direction, a six-hole valve sleeve with a set of oblique holes in the radial direction, a stepped column I, an eight-hole valve sleeve with a set of through holes in the radial direction, and a stepped column are installed in sequence. Ⅱ and the spring valve sleeve with two sets of oblique holes in the radial direction, and the two-hole valve sleeve, six-hole valve sleeve, step column I, eight-hole valve sleeve, step column II and spring valve sleeve are close to each other; There is a spring push rod Ⅰ in the cavity formed by the two-hole valve sleeve, six-hole valve sleeve and step column Ⅰ; a ceramic ball is arranged in the center of the eight-hole valve sleeve; On the ball; step column II and the spring valve sleeve form a cavity with a spring push rod II, and one end of the spring push rod II is on the ceramic ball; the inner wall of the left end of the two-hole valve sleeve is provided with a ring-shaped protrusion; the two-hole valve sleeve There is a U-shaped sealing frame Ⅰ inside, and the U-shaped sealing frame Ⅰ is set on the right end surface of the ring-shaped protrusion on the inner wall of the two-hole valve sleeve; a return spring Ⅰ is arranged between the U-shaped sealing frame Ⅰ and the left end shoulder of the spring push rod Ⅰ; The inner wall of the right end of the spring valve sleeve is provided with a ring-shaped protrusion, and the left end of the ring-shaped protrusion is provided with a U-shaped sealing frame II; a return spring is arranged between the shoulder surface of the right end of the spring push rod II in the spring valve sleeve and the U-shaped sealing frame II Ⅱ; the left end of the spring push rod Ⅰ protrudes from the two-hole valve sleeve; the right end of the spring push rod Ⅱ protrudes from the spring valve sleeve; the left end of the outer fixed valve sleeve Ⅰ is connected and fixed with the nut Ⅰ through threads; the inner side of the outer fixed valve sleeve Ⅰ is from the left The inner fixing sleeve I, the piezoelectric ceramic driver I and the push rod I are arranged in sequence to the right, and the inner fixing sleeve I, the piezoelectric ceramic driver I and the push rod I are close to each other; the right end of the push rod I protrudes from the spring push rod I The outer fixed valve sleeve Ⅰ is connected to the valve body through bolts and fixed; the right end of the outer fixed valve sleeve Ⅱ is connected and fixed with the nut II through threads; The inner fixing sleeve II, the piezoelectric ceramic driver II and the push rod II, and the inner fixing sleeve II, the piezoelectric ceramic driver II and the push rod II are close to each other; the left end of the push rod II and the spring push rod II protrude from the spring valve sleeve part Close to; the outer fixed valve sleeve II is connected and fixed with the valve body by bolts; the left end surface of the nut I is provided with an axial fine-tuning screw I, and the end of the axial fine-adjustment screw I pushes against the left end surface of the inner fixed sleeve I; the right end of the nut II There is an axial fine-tuning screw Ⅱ on the surface, and the end of the axial fine-tuning screw Ⅱ pushes against the right end surface of the inner fixed sleeve Ⅱ; the upper part of the valve body is provided with a water inlet, a working port and a water return port, and the water inlet, working port and water return port A valve port damper is provided; the lower part of the valve body is opened with a flow channel connecting the left and right ends of the valve body; the inner fixing sleeve Ⅰ and the nut Ⅰ are provided with a through hole for the extension of the power line of the piezoelectric ceramic driver Ⅰ; the inner fixing sleeve Ⅱ and the nut II are provided with a through hole for extending the power line of the piezoelectric ceramic driver II;

When the piezoelectric ceramic driver Ⅱ loses power and the piezoelectric ceramic driver Ⅰ is powered on, the piezoelectric ceramic driver Ⅰ pushes the push rod Ⅰ and the spring push rod Ⅰ to move to the right, the ceramic ball is separated from the stepped column Ⅰ, and the ceramic ball and the stepped column Ⅱ Connected, the liquid flows through the working port, the through hole on the eight-hole valve sleeve, the center hole of the step column I, the inclined hole on the six-hole valve sleeve, and enters the return port, and the working port and the return port on the valve body can flow through;

When the piezoelectric ceramic driver Ⅰ loses power and the piezoelectric ceramic driver Ⅱ is powered on, the piezoelectric ceramic driver Ⅱ pushes the push rod Ⅱ and the spring push rod Ⅱ to move to the left, the ceramic ball is separated from the step column II, and the ceramic ball and the step column Ⅰ Connected, the liquid flow enters the working port through the water inlet, the inclined hole at the left end of the spring valve sleeve, the center hole of the step column II, and the through hole on the eight-hole valve sleeve, and the water inlet and the working port of the valve body can flow through;

During the working process of the valve, part of the liquid flow enters the cavity where the return spring II is located, and part of the liquid flow enters the cavity where the return spring I is located through the flow channel of the valve body and the through hole on the two-hole valve sleeve, so that the spring push rod II, the spring The hydraulic pressure on the push rod Ⅰ and the ceramic ball is balanced; after the assembly of the pure water two-way opposed piezoelectric ceramic reversing valve is completed, the position of the inner fixing sleeve Ⅰ can be adjusted by screwing in the fine-tuning screw Ⅰ, and then the piezoelectric ceramic driver Ⅰ can be adjusted. , Good contact between the push rod Ⅰ and the spring push rod Ⅰ; the position of the internal fixation sleeve Ⅱ can be adjusted by screwing in the fine adjustment screw Ⅱ, and then the good contact of the piezoelectric ceramic driver Ⅱ, the push rod Ⅱ and the spring push rod Ⅱ can be adjusted;

There is an O-ring Ⅰ between the two-hole valve sleeve and the valve body, an O-ring Ⅱ and a back-up ring Ⅰ between the six-hole valve sleeve and the valve body, and an O-shaped seal between the stepped column Ⅰ and the valve body. Ring Ⅲ plus back-up ring Ⅱ for sealing, O-ring Ⅳ plus back-up ring Ⅲ for sealing between step column Ⅱ and valve body, O-ring Ⅴ for sealing between spring valve sleeve and valve body, six-hole valve sleeve and spring The push rod Ⅰ is sealed by O-shaped sealing ring Ⅵ plus retaining ring Ⅳ, the spring valve sleeve and spring push rod Ⅱ are sealed by U-shaped sealing bone Ⅱ and retaining ring Ⅴ, and the U-shaped sealing skeleton Ⅰ and the inner wall of the two-hole valve sleeve There is a retaining ring Ⅵ at the contact point of the annular protrusion; the upper part of the valve body is provided with an O-shaped sealing ring Ⅵ, an O-shaped sealing ring Ⅶ and an O-shaped sealing ring Ⅷ on the inner wall of the water inlet, the working port and the water return port; the external fixed valve The minimum inner diameter of the sleeve I and the outer fixed valve sleeve II is smaller than the minimum inner diameter of the valve body; the water inlet and the working port can be interchanged to form a P-A, A-O function valve.

Compared with the background technology, the present invention has the beneficial effects of:

1. The cover or separation between the ceramic ball valve core and the stepped column is used to realize the flow of liquid, and no leakage can be realized. Since the on-off switching is performed by the ceramic ball, the stroke of the ceramic ball is the opening of the valve, so the stroke is short and greatly improved. The reversing and reset time of the reversing valve is shortened, and the reaction speed is improved;

2. The valve body and the valve sleeve, the valve sleeve and the spring push rod are sealed with O-shaped sealing ring and U-shaped sealing frame, which effectively solves the problem of serious leakage of the pure water reversing valve. The reasonable arrangement of the flow channel makes the spring push rod The hydraulic pressure on the rod and the ceramic ball is balanced, which can ensure the flexible and reliable movement of the ball valve core;

3. Valve port dampers are installed at the water inlet, working port and return water port of the valve body. By adjusting the damper, the speed of the liquid flow can be controlled, which improves the dynamic and static performance of the reversing valve;

4. The driving part of the valve adopts a piezoelectric ceramic driver. Since the piezoelectric ceramic has a high voltage response frequency, the valve is suitable for a relatively high responsive working condition, and only one hold is required during the working process of the piezoelectric ceramic. voltage and is not subject to external electromagnetic interference, so the valve has the characteristics of low power consumption and strong anti-electromagnetic interference;

5. The valve has the characteristics of simple structure, convenient installation, good manufacturability and easy standardization, and is suitable for serial production;

The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable , the following preferred embodiments are specifically cited below, and are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

In the drawings: 1 external fixed valve sleeve, 1.1 external fixed valve sleeve Ⅰ, 1.2 external fixed valve sleeve Ⅱ, 1.3 internal fixed sleeve Ⅰ, 1.4 piezoelectric ceramic driver Ⅰ, 1.5 push rod, 1.6 internal fixed sleeve Ⅱ, 1.7 piezoelectric Ceramic driver II, 1.8 push rod II, 2 valve body, 2.1 two-hole valve sleeve, 2.2 six-hole valve sleeve, 2.3 stepped column I, 2.4 eight-hole valve sleeve, 2.5 stepped column II, 2.6 spring valve sleeve, 2.7 spring push rod Ⅰ, 2.8 ceramic ball, 2.9 spring push rod Ⅱ, 2.10 U-shaped sealing frame Ⅰ, 2.11 return spring Ⅰ, 2.12 U-shaped sealing frame Ⅱ, 2.13 return spring Ⅱ, 2.14 O-shaped sealing ring Ⅰ, 2.15 O-shaped sealing ring Ⅱ, 2.16 retaining ring Ⅰ, 2.17 O-ring Ⅲ, 2.18 retaining ring Ⅱ, 2.19O-ring Ⅳ, 2.20 retaining ring Ⅲ, 2.21O-ring Ⅴ, 2.22O-ring Ⅵ, 2.23 retaining ring Ⅳ, 2.24 block Ring Ⅴ, 2.25 retaining ring Ⅵ, 2.26 O-shaped sealing ring Ⅵ, 2.27 O-shaped sealing ring Ⅶ, 2.28 O-shaped sealing ring Ⅷ, 3 fixed nut, 3.1 nut Ⅰ, 3.2 nut Ⅱ, 3.3 fine-tuning screw Ⅰ, 3.4 Fine adjustment screw Ⅱ, G flow channel, P water inlet, A working port, O return water port.

Detailed ways

The pure water two-way opposed piezoelectric ceramic directional valve of the present invention as shown in Figure 1 comprises an outer fixed valve sleeve 1, a valve body 2 and a fixed nut 3; the outer fixed valve sleeve 1 includes, respectively fixed on the valve body 2 The outer fixed valve sleeve I1.1 and the outer fixed valve sleeve II1.2 at the left and right ends; the fixed nut 3 includes the nut I3.1 fixed on the left end of the outer fixed valve sleeve I1.1 and the outer fixed valve sleeve II1 .2 The nut on the right end II 3.2; the inner axis of the valve body 2 is provided with a through hole, and a two-hole valve sleeve with a group of through holes in the radial direction is installed in the through hole in sequence from left to right 2.1, radial opening Six-hole valve sleeve 2.2 with a set of oblique holes, stepped column I 2.3, eight-hole valve sleeve 2.4 with a set of through holes in the radial direction, stepped column II 2.5, and spring valve sleeve 2.6 with two sets of oblique holes in the radial direction , and the two-hole valve sleeve 2.1, six-hole valve sleeve 2.2, step column I2.3, eight-hole valve sleeve 2.4, step column II2.5 and spring valve sleeve 2.6 are close to each other; in the two-hole valve sleeve 2.1, The six-hole valve sleeve 2.2 and the stepped column I2.3 form a cavity with a spring push rod I2.7; the center of the eight-hole valve sleeve 2.4 is equipped with a ceramic ball 2.8; one end of the spring push rod I2.7 is mounted on the eight-hole valve On the ceramic ball 2.8 in the sleeve 2.4; a spring push rod II 2.9 is arranged in the cavity formed by the stepped column II 2.5 and the spring valve sleeve 2.6, and one end of the spring push rod II 2.9 is supported on the ceramic ball 2.8; the two-hole valve The inner wall of the left end of the sleeve 2.1 is provided with an annular protrusion; the two-hole valve sleeve 2.1 is provided with a U-shaped sealing skeleton I 2.10, and the U-shaped sealing skeleton I 2.10 is arranged at the annular protrusion on the inner wall of the two-hole valve sleeve 2.1 The right end face; the return spring I2.11 is arranged between the U-shaped sealing frame I2.10 and the left end shoulder of the spring push rod I2.7; the inner wall of the right end of the spring valve sleeve 2.6 is provided with an annular protrusion, and the left end of the annular protrusion is provided There is a U-shaped sealing frame II 2.12; the spring push rod II 2.9 in the spring valve sleeve 2.6 is provided with a return spring II 2.13 between the shoulder surface of the right end of the spring push rod II 2.9 and the U-shaped sealing frame II 2.12; the left end of the spring push rod I 2.7 protrudes In the two-hole valve sleeve 2.1; the right end of the spring push rod II 2.9 protrudes from the spring valve sleeve 2.6; the left end of the outer fixed valve sleeve I1.1 is connected and fixed with the nut I3.1 through threads; the inner fixed valve sleeve I1.1 is self-contained From left to right, there are internal fixation sleeve I1.3, piezoelectric ceramic driver I1.4 and push rod I1.5, and the internal fixation sleeve I1.3, piezoelectric ceramic driver I1.4 and push rod I1.5 are tightly connected to each other. Lean; the right end of the push rod Ⅰ1.5 and the spring push rod Ⅰ2.7 protrude from the part of the valve sleeve 2.1 in the second hole; the outer fixed valve sleeve Ⅰ1.1 is connected and fixed with the valve body 2 by bolts; the outer fixed valve sleeve Ⅱ1.2 The right end is connected and fixed with the nut II 3.2 through threads; the outer fixed valve sleeve II 1.2 is provided with an inner fixed sleeve II 1.6, a piezoelectric ceramic driver II 1.7 and a push rod II 1.8 in sequence from right to left, and the inner The fixed sleeve Ⅱ1.6, the piezoelectric ceramic driver Ⅱ1.7 and the push rod Ⅱ1.8 are close to each other; the left end of the push rod Ⅱ1.8 is close to the spring push rod Ⅱ2.9 protruding from the spring valve sleeve 2.6; the external solid The fixed valve sleeve II1.2 is connected and fixed with the valve body 2 by bolts; the left end of the nut I3.1 is provided with an axial fine-tuning screw I3.3, and the end of the axial fine-adjustment screw I3.3 pushes against the left end of the inner fixed sleeve I1.3 On the surface; the right end surface of the nut II3.2 is provided with an axial fine-tuning screw II3.4, and the end of the axial fine-adjustment screw II3.4 pushes against the right end surface of the inner fixed sleeve II1.6; the upper part of the valve body 2 has a water inlet P , the working port A and the water return port O, and the water inlet P is provided with a valve port damper 2.13; the lower part of the valve body 2 is opened with a flow channel G connecting the left and right ends of the valve body 2; between the two-hole valve sleeve 2.1 and the valve body 2 O-shaped sealing ring Ⅰ2.14 is provided, and the space between the six-hole valve sleeve 2.2 and the valve body 2 is sealed with O-shaped sealing ring Ⅱ2.15 plus retaining ring Ⅰ2.16, and O-shaped sealing ring Ⅱ2.15 plus retaining ring Ⅰ2.16 It is also possible to seal the two-hole valve sleeve 2.1 and the six-hole valve sleeve 2.2; between the stepped column I2.3 and the valve body 2, use O-shaped sealing ring III2.17 and back-up ring II2.18 to seal, and the stepped column II2.5 and the valve body Body 2 is sealed with O-ring Ⅳ2.19 plus back-up ring Ⅲ2.20, between spring valve sleeve 2.6 and valve body 2 is sealed with O-ring Ⅴ2.21, six-hole valve sleeve 2.2 and spring push rod Ⅰ2 .7 is sealed through O-shaped sealing ring Ⅵ2.22 plus retaining ring Ⅳ2.23, between spring valve sleeve 2.6 and spring push rod Ⅱ2.9 is sealed through U-shaped sealing skeleton Ⅱ2.12 plus retaining ring Ⅴ2.24, U A retaining ring Ⅵ2.25 is provided at the contact point between the shape seal frame Ⅰ2.10 and the annular protrusion on the inner wall of the two-hole valve sleeve 2.1; the upper part of the valve body 2 is provided with a water inlet P, a working port A and a water return port O. The inner walls are respectively provided with O-shaped The sealing ring Ⅵ2.26, the O-ring Ⅶ2.27 and the O-ring Ⅷ2.28; the minimum inner diameter of the outer fixed valve sleeve Ⅰ1.1 and the outer fixed valve sleeve Ⅱ1.2 is smaller than the minimum inner diameter of the valve body 2, and then the two holes The end face of the valve sleeve 2.1 can be pushed against the right end face of the outer fixed sleeve I1.1, and the right end face of the spring valve sleeve 2.6 can be pushed against the left end face of the outer fixed sleeve II1.2.

With the pure water two-way opposed piezoelectric ceramic reversing valve of the present invention adopting the above structure, when the piezoelectric ceramic driver II 1.7 is de-energized and the piezoelectric ceramic driver I 1.4 is powered on, the piezoelectric ceramic driver I 1.4 generates deformation and pushes The push rod I1.5 and the spring push rod I2.7 move to the right, and then the spring push rod I2.7 pushes the ceramic ball 2.8, so that the ceramic ball 2.8 is separated from the step column I2.3 and joined with the step column II2.5, and the liquid flows through The working port A, the through hole on the eight-hole valve sleeve 2.4, the center hole of the step column I 2.3, the oblique hole on the six-hole valve sleeve 2.2, enter the backwater port O, and the working port A on the valve body 2 and the backwater port O can be connected. When the piezoelectric ceramic driver Ⅰ1.4 is de-energized and the piezoelectric ceramic driver Ⅱ1.7 is energized, the piezoelectric ceramic driver Ⅱ1.7 deforms and pushes the push rod Ⅱ1.8 and the spring push rod Ⅱ2.9 to move to the left, Furthermore, the spring push rod II1.8 pushes the ceramic ball 2.8, so that the ceramic ball 2.8 is separated from the step column II2.5 and joined with the step column I2.3, and the liquid flows through the water inlet P, the inclined hole at the left end of the spring valve sleeve 2.6, and the step column Ⅱ2.5 The center hole and the through hole on the eight-hole valve sleeve 2.4 enter the working port A, and the water inlet P of the valve body 2 and the working port A can flow through;

During the working process of the valve, part of the liquid flow enters the cavity where the return spring II 2.13 is located, and part of the liquid flow enters the cavity where the return spring I 2.11 is located through the flow channel G of the valve body and the through hole on the two-hole valve sleeve 2.1, so that Spring push rod Ⅱ2.9, spring push rod Ⅰ2.7 and ceramic ball 2.8 are subjected to hydraulic pressure balance, which can ensure that ceramic ball 2.8 moves flexibly and reliably, and is suitable for medium and high pressure water medium working conditions; pure water two-way opposing piezoelectric ceramics After the reversing valve is assembled, the user can adjust the position of the internal fixing sleeve I1.1 by screwing in the fine-tuning screw I3.3, and then adjust the piezoelectric ceramic driver I1.4, push rod I1.5 and spring push rod I2. 7 good contact; the position of the internal fixation sleeve Ⅱ1.6 can be adjusted by screwing in the fine-tuning screw Ⅱ3.4, and then the good contact of the piezoelectric ceramic driver Ⅱ1.7, push rod Ⅱ1.8 and spring push rod Ⅱ2.9 can be adjusted ;

The piezoelectric ceramic driver has a high response frequency to the voltage, which makes the reversing valve have a good advantage in occasions with high response requirements, and the piezoelectric ceramic driver has good electromagnetic anti-interference performance, and can be used in places with strong electromagnetic fields. In the environment, it overcomes the defects of the previous electromagnetic reversing valve in this respect, and the piezoelectric ceramic driver will not consume a large amount of holding current. Therefore, compared with the electromagnetic reversing valve, this reversing valve has a stronger performance in low power consumption. The advantage of the piezoelectric ceramic driver is two-way opposing drive mode. When one end of the piezoelectric ceramic driver is powered on, the other end is de-energized at the same time to ensure synchronous cooperation during driving. The ceramic ball 2.8 is used to separate or join the stepped column to achieve The opening or closing of the circuit shortens the movement stroke and improves the reaction speed; the two structures cooperate with each other to ensure the high responsiveness of the reversing valve; There is a valve port damper 2.13, which improves the dynamic and static performance of the valve.

In order to be able to adapt to the special requirements of the water medium, all components of the valve can be made of corrosion-resistant and stainless materials, which can ensure that the valve has a long service life in the working environment of the water medium. In addition, the valve has the characteristics of simple structure, convenient installation, good manufacturability, and easy standardization, making it suitable for serial production.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this field Without departing from the scope of the technical solution of the present invention, the skilled person can use the technical content disclosed in the appeal to make some changes or modify them into equivalent embodiments with equivalent changes. Technical Essence Any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the technical solution of the present invention.

Claims (3)

1. the two-way opposed piezoelectric constant selector valve of pure water, comprise outer fixing valve pocket (1), valve body (2) and hold-doun nut (3), it is characterized in that: described outer fixing valve pocket (1) comprises, is separately fixed at axially outer fixing valve pocket I (1.1) and the outer fixing valve pocket II (1.2) at two ends, left and right of valve body (2), described hold-doun nut (3) comprises, be fixed on outer fixing valve pocket I (1.1) axially left end nut I (3.1) and be fixed on the nut II (3.2) of outer fixing valve pocket II (1.2) right-hand member, described valve body (2) inner axes is provided with through hole, and the two ports valve covers (2.1) that radially have one group of through hole are installed in through hole from left to right successively, radially have six ports valve covers (2.2) of one group of inclined hole, step post I (2.3), radially have the octal valve pocket (2.4) of one group of through hole, step post II (2.5) and radially have the spring valve pocket (2.6) of two groups of inclined holes, and described two ports valve covers (2.1), six ports valve covers (2.2), step post I (2.3), octal valve pocket (2.4), between step post II (2.5) and the each parts of spring valve pocket (2.6) mutually near, in forming cavity, two ports valve covers (2.1), six ports valve covers (2.2) and step post I (2.3) be provided with spring push-rod I (2.7), described octal valve pocket (2.4) center is provided with ceramic ball (2.8), one end of described spring push-rod I (2.7) withstands in the ceramic ball (2.8) being contained in octal valve pocket (2.4), described step post II (2.5) forms in cavity and is provided with spring push-rod II (2.9) with spring valve pocket (2.6), and spring push-rod II (2.9) one end withstands in ceramic ball (2.8), described two ports valve cover (2.1) left end inwalls are provided with annular projection, in described two ports valve covers (2.1), be provided with U-shaped sealing framework I (2.10), and described U-shaped sealing framework I (2.10) is arranged at two right sides, ports valve cover (2.1) inwall annular projection place, between described U-shaped sealing framework I (2.10) and spring push-rod I (2.7) left end shoulder face, be provided with Returnning spring I (2.11), described spring valve pocket (2.6) right-hand member inwall is provided with annular projection, and annular projection place left end is provided with U-shaped sealing framework II (2.12), between spring push-rod II (2.9) the right-hand member shoulder face in described spring valve pocket (2.6) and U-shaped sealing framework II (2.12), be provided with Returnning spring II (2.13), described spring push-rod I (2.7) left end stretches out in two ports valve covers (2.1), described spring push-rod II (2.9) right-hand member stretches out in spring valve pocket (2.6), described outer fixing valve pocket I (1.1) left end is connected and fixed by screw thread and nut I (3.1), in described outer fixing valve pocket I (1.1), be disposed with from left to right interior fixed cover I (1.3), piezoelectric ceramic actuator I (1.4) and push rod I (1.5), and described interior fixed cover I (1.3), piezoelectric ceramic actuator I (1.4) and push rod I (1.5) mutually near, described push rod I (1.5) right-hand member and spring push-rod I (2.7) stretch out in two ports valve covers (2.1) parts near, described outer fixing valve pocket I (1.1) is connected and fixed by bolt and valve body (2), described outer fixing valve pocket II (1.2) right-hand member is connected and fixed by screw thread and nut II (3.2), the interior right-to-left of described outer fixing valve pocket II (1.2) is disposed with interior fixed cover II (1.6), piezoelectric ceramic actuator II (1.7) and push rod II (1.8), and described interior fixed cover II (1.6), piezoelectric ceramic actuator II (1.7) and push rod II (1.8) mutually near, described push rod II (1.8) left end and spring push-rod II (2.9) stretch out in spring valve pocket (2.6) part near, described outer fixing valve pocket II (1.2) is connected and fixed by bolt and valve body (2), described nut I (3.1) left side is provided with axial micrometer adjusting screw I (3.3), and described axial micrometer adjusting screw I (3.3) end withstands on interior fixed cover I (1.3) left side, described nut II (3.2) right side is provided with axial micrometer adjusting screw II (3.4), and described axial micrometer adjusting screw II (3.4) end withstands on interior fixed cover II (1.6) right side, described valve body (2) top has water intake (P), working hole (A) and backwater mouth (O), and is provided with valve port damper (2.13) in described water intake (P), working hole (A) and backwater mouth (O), described valve body (2) bottom has the runner (G) that is communicated with valve body (2) two ends, left and right, in described interior fixed cover I (1.3) and nut I (3.1), be provided with the through hole stretching out for piezoelectric ceramic actuator I (1.4) power line, in described interior fixed cover II (1.6) and nut II (3.2), be provided with the through hole stretching out for piezoelectric ceramic actuator II (1.7) power line,

When piezoelectric ceramic actuator II (1.7) dead electricity, piezoelectric ceramic actuator I (1.4) when electric, piezoelectric ceramic actuator I (1.4) promotes push rod I (1.5) and spring push-rod I (2.7) moves right, ceramic ball (2.8) separates with step post I (2.3), ceramic ball (2.8) engages with step post II (2.5), liquid stream is by working hole (A), through hole on octal valve pocket (2.4), step post I (2.3) center hole, inclined hole on six ports valve covers (2.2), enter backwater mouth (O), the upper working hole (A) of valve body (2) and backwater mouth (O) can be through-flow,

When piezoelectric ceramic actuator I (1.4) dead electricity, piezoelectric ceramic actuator II (1.7) when electric, piezoelectric ceramic actuator II (1.7) promotion push rod II (1.8) and spring push-rod II (2.9) are to left movement, ceramic ball (2.8) separates with step post II (2.5), ceramic ball (2.8) engages with step post I (2.3), liquid stream is by water intake (P), the inclined hole of the upper left end of spring valve pocket (2.6), step post II (2.5) center hole, through hole on octal valve pocket (2.4), enter working hole (A), valve body (2) water intake (P) and working hole (A) can be through-flow.

2. the two-way opposed piezoelectric constant selector valve of pure water according to claim 1, it is characterized in that: between two ports valve covers (2.1) and valve body (2), be provided with O-ring seals I (2.14), between six ports valve covers (2.2) and valve body (2), add back-up ring I (2.16) sealing by O-ring seals II (2.15), between step post I (2.3) and valve body (2), add back-up ring II (2.18) sealing by O-ring seals III (2.17), between step post II (2.5) and valve body (2), add back-up ring III (2.20) sealing by O-ring seals IV (2.19), between spring valve pocket (2.6) and valve body (2), seal by O-ring seals V (2.21), between six ports valve covers (2.2) and spring push-rod I (2.7), add back-up ring IV (2.23) sealing by O-ring seals VI (2.22), between spring valve pocket (2.6) and spring push-rod II (2.9), add back-up ring V (2.24) sealing by U-shaped sealing framework II (2.12), U-shaped sealing framework I (2.10) is provided with back-up ring VI (2.25) with two ports valve cover (2.1) inwall annular projection contacting points, body (2) top has water intake (P), working hole (A) and backwater mouth (O) inwall and is respectively arranged with O-ring seals VI (2.25), O-ring seals VII (2.27) and O-ring seals VIII (2.28).

3. the two-way opposed piezoelectric constant selector valve of pure water according to claim 1, is characterized in that: described outer fixing valve pocket I (1.1) and outer fixing valve pocket II (1.2) minimum diameter are less than the minimum diameter of valve body (2).