Piezoelectric pilot valve

Abstract

The utility model discloses a piezoelectric pilot valve which comprises a valve body with a valve cavity and a piezoelectric plate, an air inlet hole and an air outlet hole which are communicated with the valve cavity are arranged in the valve cavity, one end of the valve cavity is provided with an insertion opening communicated with the valve cavity, a part of the piezoelectric plate is installed in the valve cavity of the valve body in a supported mode, and the two ends of the piezoelectric plate are a sealing end and an installation end respectively. The sealing end of the piezoelectric plate is arranged corresponding to the air inlet hole, an elastic pre-tightening element is arranged between the lower surface of the sealing end of the piezoelectric plate and the valve cavity, a buckle is arranged at the socket of the valve cavity, a slot for the installation end of the piezoelectric plate to enter is formed in the buckle, the buckle is matched with the socket of the valve cavity in an inserted mode, and a first contact pin electrically connected with the piezoelectric plate is arranged on the buckle. According to the utility model, the buckle can be separated from the piezoelectric plate, the end part of the buckle can be fixed, the independently arranged buckle can be communicated with the pin and the piezoelectric plate at the same time, the installation is convenient, and the piezoelectric plate is convenient to replace.

Description

Technical Field

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

[0002] With the continuous upgrading and development of the manufacturing industry, the requirements for equipment response and environmental protection are getting higher and higher. In response to the increasing demand, pneumatic control components are increasingly widely used in current manufacturing occasions due to their high response, easy source, green and clean advantages. With the further improvement of production accuracy, the market needs a high-precision self-regulating valve that can continuously control pressure.

[0003] At present, the existing piezoelectric pilot valves on the market have one end of the piezoelectric piece completely fixed, and the other end is pressed against the air inlet by a spring to achieve sealing of the air inlet under normal conditions. However, one end of the piezoelectric piece is completely fixed, and subsequent replacement of the piezoelectric piece is inconvenient. The piezoelectric piece and the fasteners that fix the piezoelectric piece need to be replaced, and the replacement cost is high. The damaged piezoelectric piece cannot be replaced alone. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and to provide a piezoelectric pilot valve.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a piezoelectric pilot valve, comprising a valve body with a valve cavity and a piezoelectric sheet, the valve cavity having an air inlet hole and an air outlet hole connected thereto, one end of the valve cavity is provided with a socket connected thereto, a part of the piezoelectric sheet is supported and installed in the valve cavity of the valve body, the two ends of the piezoelectric sheet are respectively a sealing end and a mounting end, the sealing end of the piezoelectric sheet is arranged corresponding to the air inlet hole, an elastic pre-tightening element is arranged between the lower surface of the sealing end of the piezoelectric sheet and the valve cavity, and it is characterized in that: a buckle is arranged at the socket of the valve cavity, a slot is arranged on the buckle for the mounting end of the piezoelectric sheet to enter, the buckle is plugged into and matched with the socket of the valve cavity and a first pin electrically connected to the piezoelectric sheet is arranged on the buckle.

[0006] As a preferred technical solution of the utility model, a conductive part is provided at the mounting end of the piezoelectric sheet, and the conductive part has a first conductive sheet, a second conductive sheet and a connecting sheet sleeved on the mounting end, located on both sides of the mounting end, the first conductive sheet is limited in the slot, and a second pin directly or indirectly electrically connected to the second conductive sheet is installed on the valve body.

[0007] As a preferred technical solution of the present utility model, the first conductive sheet and the second conductive sheet respectively extend to a side away from the connecting sheet.

[0008] As a preferred technical solution of the utility model, the upper end surface of the buckle is provided with a first opening connected to the slot, the buckle forms a beam at the outer end of the first opening, the first conductive sheet at least partially has an elastic surface, the elastic surface is an arc surface or an inclined surface and the elastic surface is against the inner side of the beam.

[0009] As a preferred technical solution of the utility model, the two side walls of the slot along the insertion direction of the piezoelectric sheet are integrally or fixedly provided with clamping parts, and the width between the inner ends of the two clamping parts is greater than the width between the outer ends of the two clamping parts.

[0010] As a preferred technical solution of the utility model, a boss is provided at the center of the bottom of the buckle, the first pin is integrally provided with or fixed to the boss, and the first pin at least partially extends into the slot.

[0011] As a preferred technical solution of the utility model, a clearance port connected to the socket is provided at the bottom of the valve body corresponding to the socket position, the buckle is plug-fitted with the socket and the boss is limited in the clearance port.

[0012] As a preferred technical solution of the utility model, the piezoelectric sheet is a ceramic fiber strip.

[0013] As a preferred technical solution of the utility model, the piezoelectric sheet is covered with a protective sleeve and the mounting end of the piezoelectric sheet is exposed outside the protective sleeve.

[0014] To sum up, the beneficial effects of the utility model are as follows: the buckle can fix the mounting end of the piezoelectric sheet, and can also be separated from the piezoelectric sheet by plugging and pulling. The separately arranged fastener can connect the pin and the piezoelectric sheet at the same time. After the two are assembled, they can be directly installed into the valve body, which is convenient to install. When the piezoelectric sheet is replaced later, there is no need to replace the buckle at the same time, and the buckle can be recycled. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 It is a schematic diagram of the bottom structure of the utility model;

[0017] Figure 3 It is a cross-sectional view of the utility model;

[0018] Figure 4 This is a schematic diagram of the structure of the buckle and the piezoelectric sheet of the utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the piezoelectric sheet and the conductive member of the utility model;

[0020] Figure 6 It is a structural schematic diagram of the buckle of the utility model;

[0021] Figure 7 It is a structural schematic diagram of the conductive member of the utility model.

[0022] Figure numerals: 1. valve body; 2. valve cavity; 3. piezoelectric sheet; 4. air inlet; 5. air outlet; 6. socket; 7. sealing end; 8. mounting end; 9. buckle; 10. slot; 11. first pin; 12. conductive part; 13. first conductive sheet; 14. second conductive sheet; 15. connecting sheet; 16. first opening; 17. elastic surface; 18. clamping part; 19. boss; 20. second pin; 21. clearance port; 22. protective cover. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments and drawings, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0024] The specific embodiments of the present utility model are described below in conjunction with the accompanying drawings.

[0025] like Figures 1 to 7 A piezoelectric pilot valve is shown, comprising a valve body 1 with a valve cavity 2 and a piezoelectric sheet 3, the piezoelectric sheet 3 is preferably a ceramic fiber strip (the piezoelectric sheet 3 bends after being energized, which is a prior art, so it is not specifically described, and is not limited to the material of the ceramic fiber strip. Only one preferred method is provided in this embodiment, and other materials that bend after being energized are also acceptable. The core improvement point of this application is not the material of the piezoelectric sheet 3), the valve cavity 2 has an air inlet 4 and an air outlet 5 connected thereto, one end of the valve cavity 2 is provided with a socket 6 connected thereto, and a part of the piezoelectric sheet 3 is supported and installed on the valve of the valve body 1 In the cavity 2, the two ends of the piezoelectric sheet 3 are respectively a sealing end 7 and a mounting end 8. The sealing end 7 of the piezoelectric sheet 3 is arranged corresponding to the air inlet 4. An elastic pre-tightening element is arranged between the lower surface of the sealing end 7 of the piezoelectric sheet 3 and the valve cavity 2 (preferably a spring, not shown in the figure, under the action of the spring, the sealing end 7 of the piezoelectric sheet 3 can close the air inlet 4). A buckle 9 is arranged at the socket 6 of the valve cavity 2, and a slot 10 is arranged on the buckle 9 for the mounting end 8 of the piezoelectric sheet 3 to enter. The buckle 9 is plugged into the socket 6 of the valve cavity 2 and a first pin 11 electrically connected to the piezoelectric sheet 3 is arranged on the buckle 9.

[0026] The buckle 9 can fix the mounting end 8 of the piezoelectric sheet 3, and can also be separated from the piezoelectric sheet 3 by plugging and pulling. A separately arranged fastener can connect the pin and the piezoelectric sheet 3 at the same time. After the two are assembled, they can be directly installed in the valve body 1. The installation is convenient, and there is no need to replace the buckle 9 at the same time when replacing the piezoelectric sheet 3 later, and the buckle 9 can be recycled.

[0027] The mounting end 8 of the piezoelectric sheet 3 is provided with a conductive member 12, and the conductive member 12 has a first conductive sheet 13, a second conductive sheet 14 and a connecting sheet 15 sleeved on the mounting end 8, which are located on both sides of the mounting end 8. The piezoelectric sheet 3 is arranged through the connecting sheet 15, and the first conductive sheet 13 is limited in the slot 10. A second pin 20 directly or indirectly electrically connected to the second conductive sheet 14 is installed on the valve body 1. The second pin 20 is rod-shaped or plate-shaped (depending on the actual production setting). In this embodiment, power can be supplied to the piezoelectric sheet 3 only through the first pin 11 or the second pin 20, or the first pin 11 can be used as a positive electrode and the second pin 20 can be used as a negative electrode. The first pin 11 contacts the piezoelectric sheet 3 to achieve positive connection, and the second pin 20 contacts the piezoelectric sheet 3 to achieve negative connection. The piezoelectric sheet 3 can also be provided with positive contacts and negative contacts to contact the first pin 11 and the second pin 20 respectively.

[0028] The first conductive sheet 13 and the second conductive sheet 14 extend toward a side away from the connecting sheet 15 , respectively. After the second conductive sheet 14 enters the valve cavity 2 , it is electrically connected to the second plug pin 20 .

[0029] A boss 19 is provided at the center of the bottom of the buckle 9, and the first pin 11 is integrally provided or fixed to the boss 19. The first pin 11 at least partially extends into the slot 10. A clearance opening 21 connected to the socket 6 is provided at the bottom of the valve body 1 corresponding to the socket 6. The buckle 9 is plugged into the socket 6 and the boss 19 is limited in the clearance opening 21, so that the buckle 9 can be installed in the valve cavity 2 of the valve body 1 as much as possible.

[0030] The upper end surface of the buckle 9 is provided with a first opening 16 connected to the slot 10, and the buckle 9 forms a beam at the outer end of the first opening 16. The first conductive sheet 13 at least partially has an elastic surface 17, and the elastic surface 17 is an arc surface or an inclined surface and the elastic surface 17 is against the inner side of the beam (inserted state). The conductive part 12 can also be a metal spring sheet as a whole, and the conductive part 12 can be gold-plated.

[0031] The two side walls of the slot 10 along the insertion direction of the piezoelectric piece 3 are integrally or fixedly provided with a clamping part 18, and the width between the inner ends of the two clamping parts 18 is greater than the width between the outer ends of the two clamping parts 18. When the piezoelectric piece 3 is inserted, the inner ends of the clamping parts 18 are gradually tightened to ensure the clamping effect.

[0032] The piezoelectric sheet 3 is covered with a protective sleeve 22 and the mounting end 8 of the piezoelectric sheet 3 is exposed from the protective sleeve 22 . The protective sleeve 22 is made of silicone or rubber material.

[0033] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only preferred examples of the utility model, and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected, and the scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A piezoelectric pilot valve, comprising a valve body (1) having a valve cavity (2) and a piezoelectric sheet (3), wherein the valve cavity (2) has an air inlet (4) and an air outlet (5) connected thereto, one end of the valve cavity (2) is provided with a socket (6) connected thereto, a portion of the piezoelectric sheet (3) is supported and installed in the valve cavity (2) of the valve body (1), the two ends of the piezoelectric sheet (3) are respectively a sealing end (7) and a mounting end (8), the sealing end (7) of the piezoelectric sheet (3) is arranged corresponding to the air inlet (4), an elastic preload element is arranged between the lower surface of the sealing end (7) of the piezoelectric sheet (3) and the valve cavity (2), and characterized in that: A buckle (9) is provided at the socket (6) of the valve chamber (2), and a slot (10) is provided on the buckle (9) for the installation end (8) of the piezoelectric sheet (3) to enter. The buckle (9) is plug-fitted with the socket (6) of the valve chamber (2), and a first pin (11) electrically connected to the piezoelectric sheet (3) is provided on the buckle (9).

2. The piezoelectric pilot valve according to claim 1, characterized in that: The mounting end (8) of the piezoelectric sheet (3) is provided with a conductive member (12), the conductive member (12) comprising a first conductive sheet (13) located on two side surfaces of the mounting end (8), a second conductive sheet (14) and a connecting sheet (15) sleeved on the mounting end (8), the first conductive sheet (13) being limited in the slot (10), and a second plug pin (20) being directly or indirectly electrically connected to the second conductive sheet (14) being installed on the valve body (1).

3. The piezoelectric pilot valve according to claim 2, characterized in that: The first conductive sheet (13) and the second conductive sheet (14) respectively extend towards a side away from the connecting sheet (15).

4. The piezoelectric pilot valve according to claim 2 or 3, characterized in that: The upper end surface of the buckle (9) is provided with a first opening (16) connected to the slot (10); the buckle (9) forms a cross beam at the outer end of the first opening (16); the first conductive sheet (13) at least partially has an elastic surface (17); the elastic surface (17) is an arc surface or an inclined surface, and the elastic surface (17) abuts against the inner side of the cross beam.

5. The piezoelectric pilot valve according to claim 1, characterized in that: The two side walls of the slot (10) along the insertion direction of the piezoelectric sheet (3) are integrally or fixedly provided with clamping parts (18), and the width between the inner ends of the two clamping parts (18) is greater than the width between the outer ends of the two clamping parts (18).

6. The piezoelectric pilot valve according to claim 1, characterized in that: A boss (19) is provided at the center of the bottom of the buckle (9), the first plug pin (11) is integrally provided with or fixed to the boss (19), and the first plug pin (11) at least partially extends into the slot (10).

7. The piezoelectric pilot valve according to claim 6, characterized in that: A clearance opening (21) communicating with the socket (6) is provided at the bottom of the valve body (1) at a position corresponding to the socket (6), the buckle (9) is plug-fitted with the socket (6) and the boss (19) is limited in the clearance opening (21).

8. The piezoelectric pilot valve according to claim 1, characterized in that: The piezoelectric sheet (3) is a ceramic fiber strip.

9. The piezoelectric pilot valve according to claim 1, characterized in that: The piezoelectric sheet (3) is covered with a protective sleeve (22), and the mounting end (8) of the piezoelectric sheet (3) is exposed outside the protective sleeve (22).

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