Piezoelectric pilot valve

Abstract

The utility model discloses a piezoelectric type pilot valve, which belongs to the technical field of pilot valves and comprises a valve body, a piezoelectric plate is arranged in the valve body, an air inlet is arranged at the top of one side of the piezoelectric plate, a pre-tightening elastic element is arranged on the surface of one side, far away from the air inlet, of the piezoelectric plate, and a plug is arranged at the bottom of the pre-tightening elastic element. An air inlet hole is formed in one side of the piezoelectric patch, an air outlet hole is formed in one side of the air inlet hole, a second contact pin is arranged on the surface of the side, away from the pre-tightening elastic element, of the piezoelectric patch, a first contact pin is arranged on one side of the second contact pin, a filtering connecting assembly is arranged at the top of the air inlet hole, and a pressure relief adjusting assembly is arranged in the plug. According to the pilot valve, a fluid medium entering the air inlet hole is effectively filtered, the use stability of the valve is improved, by arranging the pressure relief adjusting assembly, pressure relief is more stable through the pressure relief small holes in the surface of the pressure relief ring when the pilot valve is used, and the practicability of the pilot valve is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of pilot valve, concretely relates to a piezoelectric pilot valve. BACKGROUND

[0002] Piezoelectric pilot valve has important role in modern production, it can provide accurate control signal, adjusts the opening or state of main valve according to actual demand, thereby avoids the system instability caused by pressure fluctuation, piezoelectric pilot valve can adapt to different working environment and condition, so that complex system can be applied in more extensive range, but the piezoelectric pilot valve currently used still has the deficiency.

[0003] Chinese patent application No.202010824344.X discloses a piezoelectric pilot valve, including valve body with valve cavity and piezoelectric sheet, two ends of piezoelectric sheet are sealing end and debugging end respectively, sealing end of piezoelectric sheet and air inlet hole are opposite;The piezoelectric sheet is installed in the valve cavity by being supported in part, so that the axial position of the first pin can be adjusted, the piezoelectric sheet can be rotated with the supported part as the fulcrum, the position of the piezoelectric sheet is fine-tuned, the piezoelectric sheet is close to the inner end hole of the air inlet hole to form a reliable seal, and the pressure on the sealing end of the piezoelectric sheet is only the pre-tightening force generated by the compression of the pre-tightening elastic element, so that the air inlet hole of the pilot valve can be normally opened, the distance between the piezoelectric sheet and the air inlet hole can be maximized, the problems of air leakage due to insufficient pre-tightening force of the piezoelectric sheet and influence on the working performance of the pilot valve due to excessive pre-tightening force of the piezoelectric sheet are solved, and the assembly difficulty is reduced.

[0004] The above-mentioned patent has the following problems when in use:

[0005] 1、The pilot valve does not set up the filter connecting assembly, and the air inlet hole of the valve may be blocked due to impurities in the fluid medium during use, or the piezoelectric sheet and the boss are not in sufficient contact, which may cause poor sealing and affect use.

[0006] 2、Since the piezoelectric sheet of the pilot valve is not provided with other pressure relief holes at the contact with the plug, the flow rate of the valve body may be unstable, affecting use, and the pressure relief hole is fixed, and cannot be adjusted according to the use condition, so the practicality is not high. UTILITY MODEL CONTENTS

[0007] To solve the problems in the background art, the utility model provides a piezoelectric pilot valve, which has the characteristics of easy connection of air inlet hole, non-clogging, better pressure relief effect and strong practicality.

[0008] To achieve the above object, the utility model provides the following technical scheme: A piezoelectric pilot valve, including the valve body, the inside of valve body is provided with piezoelectric sheet, and the top of one side of piezoelectric sheet is provided with air inlet hole, and the surface of the side of piezoelectric sheet away from air inlet hole is provided with pre-tightening elastic element, and the bottom of pre-tightening elastic element is provided with plug, and the side of air inlet hole is provided with air outlet hole, and the surface of the side of piezoelectric sheet away from pre-tightening elastic element is provided with second pin, and the side of second pin is provided with first pin, and the top of air inlet hole is provided with filter connection assembly, and the inside of plug is provided with pressure relief adjusting assembly.

[0009] Preferably, the filter connection assembly includes a fixed seat, a filter bin, a support block, a hole plate, a filter plate, an interface, and a connecting seat, wherein the top of the air inlet hole is provided with the fixed seat, the inside of the fixed seat is provided with the filter bin, the inside of the filter bin is provided with the hole plate, the bottom of the hole plate is provided with the support block, the top of the hole plate is provided with the filter plate, the top of the filter plate is provided with the interface, and the top surface of the interface is provided with the connecting seat.

[0010] Preferably, the filter bin is provided with threads at the contact with the interface, and the outer wall of the connecting seat is provided with threads.

[0011] Preferably, the pressure relief adjusting assembly includes a block, a sealing ring, a screw rod, a threaded cylinder, a groove, a pressure relief ring, and a mounting bolt, wherein the inside of the plug is provided with the block, the side of the block is provided with the groove, the surface of the block is sleeved with the sealing ring, the top of the block is provided with the pressure relief ring, the two sides of the pressure relief ring are provided with the mounting bolt, the side surface of the block is provided with the threaded cylinder, and the inside of the threaded cylinder is provided with the screw rod.

[0012] Preferably, the end surface of the screw rod is provided with a bearing at the contact with the side surface of the block.

[0013] Preferably, the end of the screw rod is provided with a hand wheel.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] 1. The filter connection assembly is arranged, which effectively filters the fluid medium entering the air inlet hole, thereby avoiding the impurities in the fluid medium from blocking the air inlet hole and adhering to the surface of the piezoelectric sheet to cause adverse effects, and improving the stability of the valve.

[0016] 2. The pressure relief adjusting assembly is arranged, which makes the pressure relief more stable through the pressure relief holes on the surface of the pressure relief ring when the pilot valve is used, thereby making the flow rate of the air inlet hole more stable when the valve is used, and adjusting the flow rate of the air inlet to a certain extent through the adjustment of the pressure relief holes, thereby improving the practicability of the pilot valve. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1The overall structure sectional view of the utility model;

[0018] Fig. 2 The sectional view of the filter connecting assembly of the utility model;

[0019] Fig. 3 The sectional view of the pressure relief adjusting assembly of the utility model;

[0020] In the figure: 1, valve body;2, filter connecting assembly;21, fixed seat;22, filter bin;23, support block;24, hole plate;25, filter plate;26, interface;27, connecting seat;3, air inlet hole;4, pre-tightening elastic element;5, pressure relief adjusting assembly;51, abutment;52, sealing ring;53, screw;54, threaded cylinder;55, groove;56, pressure relief ring;57, mounting bolt;6, plug;7, second pin;8, first pin;9, piezoelectric sheet;10, air outlet hole. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0022] Embodiment 1

[0023] Please refer to Figs. 1-3 The utility model provides the following technical scheme: a piezoelectric pilot valve, including valve body 1, the inside of valve body 1 is provided with piezoelectric sheet 9, the top of one side of piezoelectric sheet 9 is provided with air inlet hole 3, the surface of the side of piezoelectric sheet 9 away from air inlet hole 3 is provided with pre-tightening elastic element 4, the bottom of pre-tightening elastic element 4 is provided with plug 6, one side of air inlet hole 3 is provided with air outlet hole 10, the surface of the side of piezoelectric sheet 9 away from pre-tightening elastic element 4 is provided with second pin 7, one side of second pin 7 is provided with first pin 8, the top of air inlet hole 3 is provided with filter connecting assembly 2, the inside of plug 6 is provided with pressure relief adjusting assembly 5.

[0024] Specifically, filter connecting assembly 2 includes fixed seat 21, filter bin 22, support block 23, hole plate 24, filter plate 25, interface 26 and connecting seat 27, wherein, the top of air inlet hole 3 is provided with fixed seat 21, the inside of fixed seat 21 is provided with filter bin 22, the inside of filter bin 22 is provided with hole plate 24, the bottom of hole plate 24 is provided with support block 23, the top of hole plate 24 is provided with filter plate 25, the top of filter plate 25 is provided with interface 26, the top surface of interface 26 is provided with connecting seat 27.

[0025] By adopting the technical scheme, when the filter connection assembly 2 is used, first, the air inlet pipe is connected with the connecting seat 27, and before the fluid passes through the air inlet hole 3, the fluid first enters the filter bin 22, the filter plate 25 filters the impurities in the fluid medium, the hole plate 24 and the supporting block 23 reversely support the filter plate 25, prevent the position of the filter plate 25 from being deviated due to too fast fluid flow rate, and the connecting seat 27 can be taken off through the interface 26, the connecting seat 27 is conveniently connected with the air inlet pipe, the filter plate 25 can be replaced according to the characteristics of the fluid medium, the fluid passing property is ensured, and the impurities in the fluid medium are filtered, so that the impurities do not block the air inlet hole 3 or the impurities are attached to the surface of the piezoelectric sheet 9, the piezoelectric sheet 9 is insufficiently contacted with the air inlet hole 3, the sealing property of the valve body 1 is poor, and the use quality is reduced.

[0026] Specifically, threads are arranged at the contact position of the filter bin 22 and the interface 26, and the outer wall of the connecting seat 27 is provided with threads.

[0027] By adopting the technical scheme, threads are arranged at the contact position of the filter bin 22 and the interface 26, and the outer wall of the connecting seat 27 is provided with threads, so that the connecting seat 27 can be more quickly installed and dismounted through the interface 26, the replacement efficiency of the filter plate 25 is improved, and the threads on the outer wall of the connecting seat 27 facilitate the connection of the connecting seat 27 with the air inlet pipe, so that the pilot valve is more convenient to use.

[0028] In use, when the filter connection assembly 2 is used, first, the air inlet pipe is connected with the connecting seat 27, and before the fluid passes through the air inlet hole 3, the fluid first enters the filter bin 22, the filter plate 25 filters the impurities in the fluid medium, the hole plate 24 and the supporting block 23 reversely support the filter plate 25, prevent the position of the filter plate 25 from being deviated due to too fast fluid flow rate, and the connecting seat 27 can be taken off through the interface 26, the connecting seat 27 is conveniently connected with the air inlet pipe, the filter plate 25 can be replaced according to the characteristics of the fluid medium, the fluid passing property is ensured, and the impurities in the fluid medium are filtered, so that the impurities do not block the air inlet hole 3 or the impurities are attached to the surface of the piezoelectric sheet 9, the piezoelectric sheet 9 is insufficiently contacted with the air inlet hole 3, the sealing property of the valve body 1 is poor, and the use quality is reduced, threads are arranged at the contact position of the filter bin 22 and the interface 26, and the outer wall of the connecting seat 27 is provided with threads, so that the connecting seat 27 can be more quickly installed and dismounted through the interface 26, the replacement efficiency of the filter plate 25 is improved, and the threads on the outer wall of the connecting seat 27 facilitate the connection of the connecting seat 27 with the air inlet pipe, so that the pilot valve is more convenient to use.

[0029] Embodiment 2

[0030] The difference between the embodiment and the embodiment 1 is that specifically, the pressure relief adjusting assembly 5 comprises a block 51, a sealing ring 52, a screw rod 53, a threaded cylinder 54, a groove 55, a pressure relief ring 56 and mounting bolts 57, wherein the inside of the plug 6 is provided with the block 51, one side of the block 51 is provided with the groove 55, the surface of the block 51 is sleeved with the sealing ring 52, the top of the block 51 is provided with the pressure relief ring 56, both sides of the pressure relief ring 56 are provided with the mounting bolts 57, one side surface of the block 51 is provided with the threaded cylinder 54, and the inside of the threaded cylinder 54 is provided with the screw rod 53.

[0031] By adopting the above technical scheme, when the pressure relief adjusting assembly 5 is used, the piezoelectric sheet 9 deforms when it is electrified, and then the pressure in the valve body 1 decreases with the outflow of the pressure relief hole. However, the contact surface of the plug 6 and the piezoelectric sheet 9 is not provided with other pressure relief holes. When the pressure difference between the inside and outside of the valve body 1 is large during use, the piezoelectric sheet 9 may gradually approach the pressure relief hole as the voltage increases. When the distance between the pressure relief hole and the bottom surface of the piezoelectric sheet 9 is too small, the pressure relief hole will suck the piezoelectric sheet 9, thereby causing the flow rate of the inlet hole 3 to suddenly increase, and the stability and practicality of the valve body 1 are poor. Through the pressure relief small holes on the surface of the pressure relief ring 56, it can be ensured that when the contact distance between the piezoelectric sheet 9 and the pressure relief hole is small, the fluid can still flow out of the pressure relief small holes, thereby ensuring the stability of the use of the pilot valve. At the same time, when the pressure relief hole and the piezoelectric sheet 9 are not in complete contact, the screw rod 53 moves in the threaded cylinder 54 by rotating, thereby gradually pushing the block 51 to move from the inside of the groove 55 to the inside of the pressure relief hole, thereby controlling the pressure relief effect of the pressure relief hole, and thereby improving the use effect of the pilot valve.

[0032] Specifically, the end surface of the screw rod 53 is provided with a bearing at the contact position with one side surface of the block 51.

[0033] By adopting the above technical scheme, under the action of the bearing, the screw rod 53 can push the block 51 to move without rotating the block 51.

[0034] Specifically, one end of the screw rod 53 is provided with a hand wheel.

[0035] By adopting the above technical scheme, the hand wheel is rotated to more conveniently drive the screw rod 53 to adjust the pressure relief, thereby improving the practicality.

[0036] In use, when the pressure relief adjusting assembly 5 is used, the piezoelectric sheet 9 deforms when electrified, thereby reducing the pressure in the valve body 1 along with the outflow of the pressure relief hole, but the contact surface of the plug 6 and the piezoelectric sheet 9 is not provided with other pressure relief small holes, and when the pressure difference between the inside and outside of the valve body 1 is large, the piezoelectric sheet 9 may gradually approach the pressure relief hole as the voltage increases, and when the distance between the pressure relief hole and the bottom surface of the piezoelectric sheet 9 is too small, the pressure relief hole will suck the piezoelectric sheet 9, thereby causing the flow rate of the air inlet hole 3 to suddenly increase, and the stability and practicality of the pilot valve are poor, and the pressure relief small holes on the surface of the pressure relief ring 56 can ensure that when the distance between the piezoelectric sheet 9 and the pressure relief hole is small, the fluid can still flow out of the pressure relief small holes, thereby ensuring the stability of the pilot valve in use, and when the pressure relief hole and the piezoelectric sheet 9 are not in complete contact, the screw rod 53 moves in the threaded barrel 54, thereby gradually pushing the abutting block 51 to move from the recess 55 to the inside of the pressure relief hole, thereby controlling the pressure relief effect of the pressure relief hole, thereby improving the use effect of the pilot valve, and under the action of the bearing, the screw rod 53 can push the abutting block 51 to move without rotating the abutting block 51, and the screw rod 53 is more convenient to adjust the pressure relief by rotating the hand wheel, thereby improving the practicality.

[0037] The structure and use principle of the pre-tightening elastic element 4, the second pin 7, the first pin 8 and the piezoelectric sheet 9 in the utility model have been disclosed in the piezoelectric pilot valve with patent application number 202010824344.X in China.

[0038] The utility model discloses a working principle and use flow: the utility model discloses piezoelectric pilot valve is adjusted, when using filter connection subassembly 2, first connect with the connecting seat 27 of air inlet pipe, fluid is in before passing through air inlet hole 3, first enter filter bin 22, filter board 25 filters the impurity in fluid medium, orifice plate 24 and support block 23 play reverse support effect to filter board 25, prevent fluid flow rate too fast and make the position of filter board 25 deviate, simultaneously through interface 26 can take down connecting seat 27, be convenient for connecting seat 27 with air inlet pipe is connected, also make filter board 25 can be replaced according to the characteristic of fluid medium, both ensure the passability of fluid and can filter the impurity in fluid medium, prevent the impurity and block air inlet hole 3 or the impurity is attached on the surface of piezoelectric sheet 9 and leads to piezoelectric sheet 9 and air inlet hole 3 contact insufficient, further lead to the tightness of this valve body 1 is poor, reduce use quality, through the contact place of filter bin 22 and interface 26 is provided with thread, connecting seat 27 outer wall is provided with thread, so that connecting seat 27 can be installed and disassembled more quickly through interface 26, further improve the replacement efficiency of filter board 25, simultaneously the thread of connecting seat 27 outer wall is convenient for connecting seat 27 with air inlet pipe is connected, make this pilot valve use more convenient, the utility model discloses piezoelectric pilot valve is adjusted, when using pressure relief adjusting assembly 5, because piezoelectric sheet 9 is electrified and deforms, further make the pressure in valve body 1 decrease along with the outflow of pressure relief hole, but the contact surface of plug 6 and piezoelectric sheet 9 is not provided with other pressure relief small hole, when the pressure difference of valve body 1 inside and outside is larger when using, piezoelectric sheet 9 can gradually approach pressure relief hole along with the increase of voltage, when the distance between pressure relief hole and the bottom surface of piezoelectric sheet 9 is too small, pressure relief hole can suck piezoelectric sheet 9, further lead to the flow rate of air inlet hole 3 suddenly increases, make the stability of this pilot valve be poor, practicality is poor, through the pressure relief small hole on the surface of pressure relief ring 56, can ensure that when the contact distance between piezoelectric sheet 9 and pressure relief hole is small, fluid still can flow out from pressure relief small hole, further ensure the stability of pilot valve use, simultaneously when piezoelectric sheet 9 and pressure relief hole do not contact completely, through the movement of screw rod 53 in thread cylinder 54, further gradually push abutment 51 to move from recess 55 inside to pressure relief hole inside, further make the pressure relief effect of pressure relief hole can be controlled, further perfect the use effect of this pilot valve, under the action of bearing, screw rod 53 can push abutment 51 to move and abutment 51 will not rotate, through rotating hand wheel, screw rod 53 is adjusted to relieve pressure more conveniently, improve practicality.

[0039] Although the embodiments of the utility model have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A piezoelectric pilot valve, comprising a valve body (1), the inside of the valve body (1) is provided with a piezoelectric sheet (9), one side top of the piezoelectric sheet (9) is provided with an air inlet hole (3), the surface of the side of the piezoelectric sheet (9) away from the air inlet hole (3) is provided with a pre-tightening elastic element (4), the bottom of the pre-tightening elastic element (4) is provided with a plug (6), one side of the air inlet hole (3) is provided with an air outlet hole (10), the surface of the side of the piezoelectric sheet (9) away from the pre-tightening elastic element (4) is provided with a second pin (7), one side of the second pin (7) is provided with a first pin (8), characterized in that: The top of the air inlet hole (3) is provided with a filter connecting assembly (2), and the inside of the plug (6) is provided with a pressure relief adjusting assembly (5); The filter connecting assembly (2) comprises a fixing seat (21), a filter bin (22), a supporting block (23), a hole plate (24), a filter plate (25), an interface (26) and a connecting seat (27), wherein the top of the air inlet hole (3) is provided with the fixing seat (21), the inside of the fixing seat (21) is provided with the filter bin (22), the inside of the filter bin (22) is provided with the hole plate (24), the bottom of the hole plate (24) is provided with the supporting block (23), the top of the hole plate (24) is provided with the filter plate (25), the top of the filter plate (25) is provided with the interface (26), and the top surface of the interface (26) is provided with the connecting seat (27).

2. A piezoelectric pilot valve according to claim 1, characterized in that: The filter bin (22) is provided with threads at the contact with the interface (26), and the outer wall of the connecting seat (27) is provided with threads.

3. A piezoelectric pilot valve according to claim 1, characterized in that: The pressure relief adjusting assembly (5) comprises a resisting block (51), a sealing ring (52), a screw rod (53), a threaded cylinder (54), a groove (55), a pressure relief ring (56) and a mounting bolt (57), wherein the inside of the plug (6) is provided with the resisting block (51), one side of the resisting block (51) is provided with the groove (55), the surface of the resisting block (51) is sleeved with the sealing ring (52), the top of the resisting block (51) is provided with the pressure relief ring (56), both sides of the pressure relief ring (56) are provided with the mounting bolt (57), one side surface of the resisting block (51) is provided with the threaded cylinder (54), and the inside of the threaded cylinder (54) is provided with the screw rod (53).

4. A piezoelectric pilot valve according to claim 3, characterised in that: One end surface of the screw rod (53) is provided with a bearing at the contact with one side surface of the resisting block (51).

5. A piezoelectric pilot valve according to claim 3, characterised in that: One end of the screw rod (53) is provided with a hand wheel.

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