A pneumatic reversing valve

Abstract

The utility model relates to the technical field of reversing valves, and specifically discloses a pneumatic reversing valve, including a valve body, a valve core, a first piezoelectric sheet, a second piezoelectric sheet and a third piezoelectric sheet. One end of the valve core, the inner wall of the valve body and the first piezoelectric sheet are combined to form a pilot cavity, and the other end of the valve core and the inner wall of the valve body are combined to form an air cavity. A core cavity is arranged inside the valve core, and the core cavity is connected with the pilot cavity through a first gas flow channel. The second piezoelectric sheet is located in the core cavity, and the third piezoelectric sheet is located in the pilot cavity. When the first piezoelectric sheet, the second piezoelectric sheet and the third piezoelectric sheet are energized and bent to the right at the same time, the second piezoelectric sheet will compress the core cavity to increase the pressure in the core cavity. At the same time, the first piezoelectric sheet will increase the pilot cavity to reduce the pressure in the pilot cavity. At the same time, the third piezoelectric sheet opens the first gas flow channel, and the gas in the core cavity will flow into the pilot cavity. The pressure in the pilot cavity increases, which can drive the valve core to move to one side of the air cavity to achieve reversal, and the stability is good.

Description

Technical Field

[0001] The utility model relates to the technical field of reversing valves, in particular to a pneumatic reversing valve. Background Art

[0002] Solenoid valves and traditional pumps are common in fluid control systems. Solenoid valves rely on the magnetic force generated by electromagnets to push the valve core to achieve opening and closing actions. However, the response speed of the solenoid valve is limited by the physical properties of the electromagnet and the time it takes for the current to establish a magnetic field, which may result in insufficient switching speed. In addition, the structure of the solenoid valve is relatively complex, including electromagnetic coils, iron cores, springs and other components, which not only increases the weight, but also makes the equipment energy consumption high, and may be accompanied by electromagnetic interference problems; and traditional pumps, such as centrifugal pumps, plunger pumps, etc., mostly require additional drive motors to provide power. Such pumps are often large in size and heavy in weight, with obvious noise during operation and high energy consumption. Their mechanical structure is complex, and maintenance costs and failure rates are also increased accordingly. In addition, traditional pumps are limited in their ability to precisely control fluid flow, especially in situations where small flow adjustments are required. Summary of the invention

[0003] The utility model is made in consideration of the above-mentioned problems. The purpose of the utility model is to provide a pneumatic reversing valve, which realizes the adjustment of air pressure through a piezoelectric plate, and then drives the valve core. Under the premise of ensuring control accuracy, the structure is simpler, not easily affected by external factors, and has good stability.

[0004] To achieve the above-mentioned purpose, the utility model provides a pneumatic reversing valve, comprising a valve body, a valve core, a first piezoelectric sheet, a second piezoelectric sheet and a third piezoelectric sheet, wherein a receiving cavity is arranged in the valve body, the valve core is movably arranged in the receiving cavity, and one end of the valve core is surrounded by the receiving cavity and the first piezoelectric sheet to form a pilot cavity, and the other end of the valve core is surrounded by the inner wall of the receiving cavity to form an air cavity, and a core cavity is arranged inside the valve core, and the core cavity is communicated with the pilot cavity through a first gas flow channel;

[0005] The second piezoelectric sheet is located in the core cavity and is used to compress or expand the core cavity. The third piezoelectric sheet is located in the pilot cavity and is used to seal or open the first gas flow channel. The area of ​​the third piezoelectric sheet is smaller than that of the first piezoelectric sheet.

[0006] According to the above-mentioned pneumatic reversing valve, it also includes a fourth piezoelectric sheet, the core cavity includes an upper cavity and a lower cavity, an air hole is provided between the upper cavity and the lower cavity, and the fourth piezoelectric sheet is located in the upper cavity and can be attached to the air hole;

[0007] The second piezoelectric sheet is located in the upper cavity, and the first gas flow channel is used to connect the upper cavity with the pilot cavity.

[0008] According to the above-mentioned pneumatic reversing valve, it also includes a fifth piezoelectric sheet. A second gas flow channel is also provided on the valve core. The second gas flow channel is used to connect the lower cavity and the pilot cavity. The fifth piezoelectric sheet is located in the pilot cavity and can be attached to the end of the second gas flow channel.

[0009] According to the pneumatic reversing valve described above, a return spring is provided in the air cavity, one end of the return spring is fixed to the inner wall of the air cavity, and the other end of the return spring can abut against the end of the valve core.

[0010] According to the pneumatic reversing valve described above, the air cavity is located on the left side of the valve core, the pilot cavity is located on the right side of the valve core, and the first piezoelectric sheet is located on the right side of the pilot cavity.

[0011] According to the pneumatic reversing valve described above, a first flow channel and a second flow channel are provided on the valve core, and the first flow channel and the second flow channel are arranged on the valve core at intervals along the axial direction of the valve core.

[0012] The utility model has the following beneficial effects: when the first piezoelectric sheet, the second piezoelectric sheet and the third piezoelectric sheet are energized and bend to the right at the same time, the second piezoelectric sheet will compress the core cavity to increase the pressure in the core cavity, and at the same time the first piezoelectric sheet will increase the pilot cavity to reduce the pressure in the pilot cavity, and at the same time the third piezoelectric sheet opens the first gas flow channel, and the gas in the core cavity will flow into the pilot cavity, and after power is cut off and reset, the pressure in the pilot cavity increases, and when it is greater than the pressure in the gas cavity, the valve core can be driven to move to one side of the gas cavity to achieve reversal, and its stability is good, and the gas flow rate can be accurately controlled by controlling the current size with high precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a cross-sectional view of the overall structure before commutation of the embodiment;

[0014] Figure 2 It is a cross-sectional view of the overall structure after reversing of the embodiment.

[0015] In the figure:

[0016] 1. Valve body; 11. Pilot chamber; 12. Air chamber; 13. Return spring; 2. Valve core; 21. Core chamber; 211. Upper chamber; 212. Lower chamber; 22. First gas flow channel; 23. Second gas flow channel; 24. First flow channel; 25. Second flow channel; 3. First piezoelectric sheet; 4. Second piezoelectric sheet; 5. Third piezoelectric sheet; 6. Fourth piezoelectric sheet; 7. Fifth piezoelectric sheet. DETAILED DESCRIPTION

[0017] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0018] like Figure 1-2 As shown, a pneumatic reversing valve includes a valve body 1, a valve core 2, a first piezoelectric sheet 3, a second piezoelectric sheet 4, a third piezoelectric sheet 5, a fourth piezoelectric sheet 6 and a fifth piezoelectric sheet 7.

[0019] Among them, the first piezoelectric sheet 3, the second piezoelectric sheet 4, the third piezoelectric sheet 5, the fourth piezoelectric sheet 6 and the fifth piezoelectric sheet 7 are all bent by applying current. In the present embodiment, since the first piezoelectric sheet 3 requires a larger area, the first piezoelectric sheet 3 includes a diaphragm and a piezoelectric ceramic bonded to the diaphragm. The second piezoelectric sheet 4, the third piezoelectric sheet 5, the fourth piezoelectric sheet 6 and the fifth piezoelectric sheet 7 all include piezoelectric ceramics and metal sheets. The piezoelectric ceramics will bend after current is passed through them, and drive the metal sheet and the diaphragm to bend, and the bending direction can be controlled by current.

[0020] Based on this, a accommodating cavity is provided in the valve body 1, and the valve core 2 is movably arranged in the accommodating cavity, and one end of the valve core 2 is surrounded by the accommodating cavity and the first piezoelectric sheet 3 to form a pilot cavity 11, and the other end of the valve core 2 is surrounded by the inner wall of the accommodating cavity to form an air cavity 12, and a core cavity 21 is provided inside the valve core 2, and the core cavity 21 is connected with the pilot cavity 11 through the first gas flow channel 22, the second piezoelectric sheet 4 is located in the core cavity 21, and is used to compress or enlarge the core cavity 21, the third piezoelectric sheet 5 is located in the pilot cavity 11, and is used to seal or open the first gas flow channel 22, the area of ​​the third piezoelectric sheet 5 is smaller than the area of ​​the first piezoelectric sheet 3, then between the first piezoelectric sheet 3 and the second piezoelectric sheet 4, the third piezoelectric sheet 5 is located in the pilot cavity 11, and is used to seal or open the first gas flow channel 22. When the piezoelectric sheet 4 and the third piezoelectric sheet 5 are energized and bend to the right at the same time, the second piezoelectric sheet 4 will compress the core cavity 21 to increase the pressure in the core cavity 21, and the first piezoelectric sheet 3 will increase the pressure in the pilot cavity 11 to reduce the pressure in the pilot cavity 11, and the third piezoelectric sheet 5 will open the first gas flow channel 22, and the gas in the core cavity 21 will flow into the pilot cavity 11. After power is cut off and reset, the pressure in the pilot cavity 11 increases. When it is greater than the pressure in the gas cavity 12, the valve core 2 can be driven to move to one side of the gas cavity 12 to achieve reversing. It has good stability, and the gas flow rate can be accurately controlled by controlling the current size with high accuracy.

[0021] In order to enhance gas fluidity, the core cavity 21 includes an upper cavity 211 and a lower cavity 212, and an air hole is provided between the upper cavity 211 and the lower cavity 212. The fourth piezoelectric sheet 6 is located in the upper cavity 211 and can be attached to the air hole. The second piezoelectric sheet 4 is located in the upper cavity 211. The first gas flow channel 22 is used to connect the upper cavity 211 with the pilot cavity 11. When the second piezoelectric sheet 4 is energized and causes the second piezoelectric sheet 4 to bend to the left, the upper cavity 211 can be enlarged, and the pressure in the upper cavity 211 is reduced. At this time, the fourth piezoelectric sheet 6 is energized, the air hole is opened, and the lower cavity 212 is opened. The air flow inside will flow into the upper cavity 211 due to the pressure difference. At this time, the second piezoelectric sheet 4 and the fourth piezoelectric sheet 6 are powered off, the pressure in the upper cavity 211 increases, the third piezoelectric sheet 5 is powered on to open the first gas flow channel 22, and at the same time, the first piezoelectric sheet 3 is powered on to bend to the right, increasing the volume of the pilot cavity 11, and at the same time, the pressure in the pilot cavity 11 is reduced. In this case, the air flow in the upper cavity 211 flows into the pilot cavity 11. After the third piezoelectric sheet 5 and the first piezoelectric sheet 3 are powered off, the pressure in the pilot cavity 11 increases and is greater than the pressure in the air cavity 12, thereby driving the valve core 2 to move to the side of the air cavity 12.

[0022] In order to achieve the resetting of the valve core 2, a resetting spring 13 is provided in the air cavity 12, one end of the resetting spring 13 is fixed on the inner wall of the air cavity 12, and the other end of the resetting spring 13 can be abutted against the end of the valve core 2. At the same time, a second gas flow channel 23 is also provided on the valve core 2, and the second gas flow channel 23 is used to connect the lower cavity 212 and the pilot cavity 11. The fifth piezoelectric sheet 7 is located in the pilot cavity 11 and can be attached to the end of the second gas flow channel 23. When the valve core 2 needs to be reset, the fifth piezoelectric sheet 7 is energized to open the second gas flow channel 23. At this time, since the pressure in the pilot cavity 11 is greater than the pressure in the lower cavity 212, the airflow in the pilot cavity 11 flows into the lower cavity 212, and then the fifth piezoelectric sheet 7 is powered off. At this time, the pressure in the pilot cavity 11 is reduced, and the valve core 2 is driven to reset under the action of the resetting spring 13.

[0023] Specifically, the air cavity 12 is located on the left side of the valve core 2, the pilot cavity 11 is located on the right side of the valve core 2, the first piezoelectric sheet 3 is located on the right side of the pilot cavity 11, and the valve core 2 is provided with a first flow channel 24 and a second flow channel 25. The first flow channel 24 and the second flow channel 25 are arranged on the valve core 2 along the axial direction of the valve core 2, and the first flow channel 24 and the second flow channel 25 are used to connect the flow channels on the valve body 1 to realize the conduction of gas or liquid.

[0024] The technical solution of the utility model is described in detail above in conjunction with the accompanying drawings, and the described embodiments are used to help understand the idea of ​​the utility model. The specific embodiments described herein are merely examples of the spirit of the utility model. A person skilled in the art of the utility model may make various modifications or supplements to the described specific embodiments or replace them in a similar manner, but this will not deviate from the spirit of the utility model or exceed the scope defined by the attached claims.

[0025] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] In addition, in the present invention, the descriptions of "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A pneumatic reversing valve, characterized in that: The valve body comprises a valve core, a first piezoelectric sheet, a second piezoelectric sheet and a third piezoelectric sheet, wherein a receiving cavity is arranged in the valve body, the valve core is movably arranged in the receiving cavity, and one end of the valve core is surrounded by the receiving cavity and the first piezoelectric sheet to form a pilot cavity, and the other end of the valve core is surrounded by the inner wall of the receiving cavity to form an air cavity, and a core cavity is arranged inside the valve core, and the core cavity is communicated with the pilot cavity through a first gas flow channel; The second piezoelectric sheet is located in the core cavity and is used to compress or expand the core cavity. The third piezoelectric sheet is located in the pilot cavity and is used to seal or open the first gas flow channel. The area of ​​the third piezoelectric sheet is smaller than that of the first piezoelectric sheet.

2. A pneumatic reversing valve according to claim 1, characterized in that: It also includes a fourth piezoelectric sheet, the core cavity includes an upper cavity and a lower cavity, an air hole is provided between the upper cavity and the lower cavity, the fourth piezoelectric sheet is located in the upper cavity and can be attached to the air hole; The second piezoelectric sheet is located in the upper cavity, and the first gas flow channel is used to connect the upper cavity with the pilot cavity.

3. A pneumatic reversing valve according to claim 2, characterized in that: It also includes a fifth piezoelectric sheet. The valve core is also provided with a second gas flow channel, the second gas flow channel is used to connect the lower cavity and the pilot cavity. The fifth piezoelectric sheet is located in the pilot cavity and can be attached to the end of the second gas flow channel.

4. A pneumatic reversing valve according to claim 3, characterized in that: A return spring is arranged in the air cavity, one end of the return spring is fixed on the inner wall of the air cavity, and the other end of the return spring can abut against the end of the valve core.

5. The pneumatic reversing valve according to claim 1, characterized in that: The air cavity is located on the left side of the valve core, the pilot cavity is located on the right side of the valve core, and the first piezoelectric sheet is located on the right side of the pilot cavity.

6. The pneumatic reversing valve according to claim 1, characterized in that: The valve core is provided with a first flow channel and a second flow channel, and the first flow channel and the second flow channel are arranged on the valve core at intervals along the axial direction of the valve core.

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