CN212297799U - Electric control precision pressure regulating valve - Google Patents

Abstract

The utility model discloses an electric control precision pressure regulating valve, which is formed by integrally assembling an electric control valve, a pilot valve and a main valve; the main valve is formed with an air inlet, a first working port and an exhaust port; an air inlet valve group and an air outlet valve group are arranged in the main valve; the electric control valve is internally provided with a pressure sensor, a circuit board and two electromagnetic valves, the pilot valve comprises a pilot valve body and a cavity-dividing diaphragm, and the cavity-dividing diaphragm divides an inner cavity of the pilot valve body into a pilot cavity communicated with the two electromagnetic valves and a balance cavity communicated with the first working port; the two electromagnetic valves comprise an air inlet electromagnetic valve and an air outlet electromagnetic valve, the cavity dividing membrane is connected with a push rod, the push rod pushes the air inlet valve group to open an air inlet channel under the driving of downward elastic deformation movement of the cavity dividing membrane, and the push rod pulls the air outlet valve group to open an air outlet channel under the driving of upward elastic deformation movement of the cavity dividing membrane. The utility model discloses compact structure, small, simple to operate to can guarantee the stability of work atmospheric pressure in the system.

Description

Electric control precision pressure regulating valve

Technical Field

The utility model belongs to the technical field of the control technique of atmospheric pressure and specifically relates to an air-vent valve, specifically speaking are automatically controlled accurate air-vent valve that enables atmospheric pressure to stabilize at required state.

Background

The main function of the pressure regulating valve is to regulate the working pressure of the pressure fluid, so as to ensure that the working pressure of the pressure fluid can be stabilized at a required pressure value. In the prior art, the pressure regulating valve applied to the air pressure equipment generally has low integration level, larger volume and insensitive reaction, so that the fluctuation range of the air pressure is easy to be larger.

Disclosure of Invention

The utility model aims to solve the technical problem to provide an automatically controlled accurate air-vent valve to the current situation of above-mentioned prior art, this air-vent valve is small, simple to operate to can guarantee the stability of working pressure in the system through electric control.

The utility model provides a technical scheme that above-mentioned technical problem adopted does:

an electric control precision pressure regulating valve is assembled into a whole by superposing an electric control valve, a pilot valve and a main valve; the main valve is formed with an air inlet, a first working port and an exhaust port; an air inlet valve group for controlling the on-off of an air inlet channel between the air inlet and the first working port and an exhaust valve group for controlling the on-off of an exhaust channel between the exhaust port and the first working port are arranged in a valve cavity of the main valve; the electric control valve is internally provided with a pressure sensor for detecting the air pressure of the first working port in real time, a circuit board connected with a feedback circuit of the pressure sensor and two electromagnetic valves controlled by the circuit board, the pilot valve comprises a pilot valve body and a cavity dividing diaphragm arranged in an inner cavity of the pilot valve body, and the cavity dividing diaphragm divides the inner cavity of the pilot valve body into a pilot cavity positioned above the cavity dividing diaphragm and communicated with the two electromagnetic valves and a balance cavity positioned below the cavity dividing diaphragm and communicated with the first working port; the two electromagnetic valves comprise an air inlet electromagnetic valve and an air outlet electromagnetic valve, the air inlet electromagnetic valve is used for supplying air to the pilot cavity to force the sub-cavity diaphragm to elastically deform downwards to move, the air outlet electromagnetic valve is used for discharging gas in the pilot cavity to enable the sub-cavity diaphragm to elastically deform upwards to move, the sub-cavity diaphragm is connected with a push rod, the push rod pushes the air inlet valve group to open an air inlet channel under the driving of the downward elastic deformation of the sub-cavity diaphragm, and the push rod pulls the air outlet valve group to open an air outlet channel under the driving of the upward elastic deformation of the sub-cavity diaphragm.

In order to optimize the technical scheme, the specific measures adopted further comprise:

the main valve comprises a main valve body and a lower valve body which is covered at the lower end of the main valve body; the air inlet, the air outlet and the first working port are all formed on the main valve body and are sequentially arranged on the main valve body at intervals of 90 degrees; a balance feedback groove for communicating the first working port with a balance cavity of the pilot valve and a pilot air inlet groove connected with an air inlet are formed in the main valve body; and filter sheets for filtering impurities in the gas are arranged in the balance feedback tank and the pilot air inlet tank.

The exhaust valve group and the intake valve group are coaxially arranged up and down in the valve cavity of the main valve body, the exhaust valve group comprises an exhaust valve which is in sealing fit with the exhaust valve port of the exhaust passage and an exhaust valve spring which is used for pressing the exhaust valve by elasticity to realize the sealing of the exhaust valve port, the intake valve group comprises an intake valve which is in sealing fit with the intake valve port of the intake passage and an intake valve spring which is used for pressing the intake valve by elasticity to realize the sealing of the intake valve port, the lower end of the push rod passes through the exhaust valve spring and the exhaust valve in a sliding way, the bottom end face of the push rod is a top pressing plane used for pushing the air inlet valve to compress the air inlet valve spring to move downwards to open the air inlet valve port, the push rod is clamped with an annular retainer ring used for driving the exhaust valve to compress the exhaust valve spring to move upwards to open the exhaust valve port, and the upper end of the push rod is provided with an expansion head connected with the cavity-separating diaphragm in an anti-dropping mode.

The pilot valve body consists of an upper pilot valve body and a lower pilot valve body which are matched up and down; the inner cavity of the pilot valve body is formed by an inner space formed by covering and combining an upper pilot valve body and a lower pilot valve body; the cavity dividing diaphragm is formed with a pressure bearing area with an inner circular part, an elastic deformation area surrounding the pressure bearing area and an annular pressing part surrounding the elastic deformation area; the annular crimping part is fixedly pressed between the upper pilot valve body and the lower pilot valve body, a pressure-bearing sheet for ensuring the pressure-bearing uniformity of the pressure-bearing area is fixed on the pressure-bearing area by adopting a pressure-bearing screw, and the pressure-bearing sheet comprises an upper pressure-bearing sheet positioned on the upper surface of the pressure-bearing area and a lower pressure-bearing sheet positioned on the lower surface of the pressure-bearing area; the upper pressure-bearing piece and the lower pressure-bearing piece are matched and formed to be provided with an expansion head accommodating cavity for connecting the cavity-dividing membrane with the push rod; the expanding head of the push rod is clamped in an expanding head accommodating cavity formed by the upper pressure-bearing sheet and the lower pressure-bearing sheet, and the lower surface of the lower pressure-bearing sheet is connected with a diaphragm spring in a propping manner.

The lower pilot valve body of the pilot valve body is fixedly connected with the main valve body, and a first sealing ring is pressed between the connection of the lower pilot valve body and the main valve body; the lower pilot valve body is formed with a convex mouth part extending into the main valve body, the convex mouth part is processed with a sliding hole for the push rod to pass through, the upper part of the sliding hole is provided with a guide sleeve which is matched with the push rod in a sleeved mode and used for providing guide for the up-and-down movement of the push rod, a second sealing ring is installed in the guide sleeve, the exhaust valve is formed with a barrel body part used for sleeving an exhaust valve spring, the outer peripheral surface of the barrel body part is matched with the sliding hole of the lower pilot valve body in a vertical sliding mode, the upper end of the exhaust valve spring is connected to the lower end of the guide sleeve in a propping mode, the lower end of the exhaust valve spring is connected to the annular surface at the bottom end of the barrel body part.

The lower valve body is connected with the main valve body in a pressing mode, a main valve sealing ring is arranged in the middle of the lower valve body in a pressing mode, a guide hole is formed in the center of the lower valve body, a sleeve portion used for sleeving an air inlet valve spring is formed in the air inlet valve, the outer peripheral surface of the sleeve portion is matched with the guide hole of the lower valve body in a sliding guide mode, the upper end of the air inlet valve spring abuts against the inner ring surface of the sleeve portion, the lower end of the air inlet valve spring abuts against the bottom wall of the guide hole, and an O-shaped ring used for playing a sealing.

The electric control valve comprises a solenoid valve base and a shell covered on the solenoid valve base, wherein a shell sealing ring is arranged between the shell and the solenoid valve base in a pressing mode; the electromagnetic valve base is fixedly connected with an upper pilot valve body of the pilot valve body by bolts; the upper pilot valve body is embedded with a copper insert with threads, and a polygonal sealing ring is pressed between the electromagnetic valve base and the upper pilot valve body.

The air inlet electromagnetic valve and the air outlet electromagnetic valve are fixed on the electromagnetic valve base in a bilateral symmetry mode, a PCB fixing frame is fixedly installed on the electromagnetic valve base, the circuit board is installed on the PCB fixing frame, a button and an adjusting knob are installed on the top surface of the shell respectively, the button is connected with a switch button on the circuit board in a press contact mode, and the adjusting knob drives an encoder on the circuit board to rotate through a connecting shaft.

A pressure feedback groove is formed in the electromagnetic valve base, the pressure sensor is installed in the pressure feedback groove, and feedback air passages for communicating the first working port with the pressure feedback groove are formed in the main valve body, the upper pilot valve body and the lower pilot valve body.

An inserting needle plate is fixedly arranged in the electromagnetic valve base through an inserting needle plate pressing frame, a male inserting column which is used for being connected with an external power female plug in an inserting mode is arranged on the inserting needle plate, and the male inserting column is connected with a circuit board through a circuit; a protection nozzle used for protecting the male plug column is processed on the electromagnetic valve base, and external threads capable of being in spiral fit with the nut are processed on the outer peripheral surface of the protection nozzle.

Compared with the prior art, the utility model discloses an automatically controlled accurate air-vent valve comprises the integrated equipment of automatically controlled valve, pilot valve and main valve. Install pressure sensor in the automatically controlled valve, pressure sensor can feed back the atmospheric pressure data signal of the first working mouth that detects to the circuit board in real time, the circuit board can compare the back according to the atmospheric pressure data signal of feeding back and the inside atmospheric pressure setting value of setting for, through the work of control solenoid valve, come the atmospheric pressure in the control pilot valve guide chamber, make the guide chamber and the balanced chamber of pilot valve under the unbalanced condition of pressure, lead to the push rod upwards or move down, rethread push rod upwards pulls the exhaust valves and opens the exhaust passage exhaust, or push away the air intake valves through the push rod and open the air intake of air intake passage downwards, in order to guarantee the stability of first working mouth atmospheric pressure within the scope value of setting for.

The utility model discloses compact structure, small, simple to operate can guarantee the stability of working pressure in the system, use on being suitable for pressure calibration platform and all kinds of atmospheric pressure check out test set.

Drawings

Fig. 1 is an exploded schematic view of the present invention;

FIG. 2 is a cross-sectional structural view of the present invention in a no-flow balance state;

FIG. 3 is a cross-sectional structural view of the present invention at another angle when the flow balance is not present;

fig. 4 is a schematic view of an assembly structure of the pilot valve and the exhaust valve set of the present invention;

FIG. 5 is a sectional structure view of the present invention in an air intake state;

FIG. 6 is a cross-sectional view of the utility model at another angle in the air intake state;

FIG. 7 is a sectional view of the overflow device of the present invention;

FIG. 8 is a cross-sectional view of the present invention at another angle in the overflow state;

fig. 9 is a sectional view of the chambered diaphragm of the present invention.

Detailed Description

Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.

Fig. 1 to 9 are schematic structural views of the present invention.

Wherein the reference numerals are: the electromagnetic valve F, the air inlet electromagnetic valve F1, the air outlet electromagnetic valve F2, the filter sheet L, a first sealing ring M1, a second sealing ring M2, a third sealing ring M3, a housing sealing ring M4, a polygonal sealing ring M5, a copper insert T, a tabletting screw Y, the electric control valve 1, the housing 11, the electromagnetic valve base 12, a pressure feedback groove 12a, a protective nozzle 121, a pilot valve 2, a pilot cavity 2a, a balance cavity 2b, an upper pilot valve body 21, a lower pilot valve body 22, a convex nozzle part 221, a cavity separating diaphragm 23, a pressure bearing area 231, an elastic deformation area 232, an annular pressure bearing part 233, a push rod 24, an enlarged head 241, a jacking plane 242, an annular retainer ring 25, an upper pressure bearing sheet 26, a lower pressure bearing sheet 27, a guide sleeve 28, a main valve 3, an air inlet 3a, a first working port 3b, an air outlet 3c, a process blind hole 3d, a balance feedback groove 3e, a pilot groove 3F, The air inlet valve group comprises a guide hole 32a, a main valve sealing ring 33, an air inlet valve group 4, an air inlet valve 41, a sleeve part 411, an air inlet valve spring 42, an O-shaped ring 43, an air outlet valve group 5, an air outlet valve 51, a barrel part 511, an air outlet valve spring 52, a pressure sensor 6, a circuit board 7, a PCB fixing frame 71, an inserting needle plate 72, an inserting needle plate pressing frame 73, a button 8, an adjusting knob 9 and a connecting shaft 91.

As shown in the figure, the utility model discloses an automatically controlled accurate air-vent valve, this valve are applied to on the equipment of manual pressure regulating environment, for example pressure check table, all kinds of atmospheric pressure check out test set, atmospheric pressure service equipment. The automatic control valve is formed by assembling an electric control valve 1, a pilot valve 2 and a main valve 3 in an up-down overlapping mode. The main valve 3 is formed with an air inlet 3a, a first working port 3b, an exhaust port 3c and a process blind hole 3 d; the air inlet 3a is used for connecting an air source, and the first working port 3b is used for connecting a working air path of the equipment air pressure system so as to provide stable air pressure for the equipment air pressure system. The exhaust port 3c is for exhausting the pressure gas in the equipment pneumatic system to the outside when the pressure of the gas in the equipment pneumatic system is higher than a set value. The blind via 3d is formed to facilitate the machining of the internal air passage in the main valve. A valve cavity for installing an air inlet valve group 4 and an air outlet valve group 5 is formed in the main valve 3, the air outlet valve group 5 is used for controlling the connection and disconnection of an air outlet channel between the air outlet 3c and the first working port 3b, and the air inlet valve group 4 is used for controlling the connection and disconnection of an air inlet channel between the air inlet 3a and the first working port 3 b. The electric control valve 1 is internally provided with a pressure sensor 6, two electromagnetic valves F and a circuit board 7 playing a main control role, the pressure sensor 6 is used for detecting the air pressure of the first working port 3b in real time and feeding back the detected air pressure data electric signal to the circuit board 7, the circuit board 7 can compare the detected air pressure data with an internally set air pressure set value and then output a control electric signal according to the comparison result to control the electromagnetic valves F to work.

The utility model discloses a pilot valve 2 includes the pilot valve body and installs the branch chamber diaphragm 23 in this pilot valve body's inner chamber, divides chamber diaphragm 23 to be rubber products, and it cuts apart into the inner chamber of pilot valve body to lie in the guide chamber 2a that divides chamber diaphragm 23 top and lie in the balanced chamber 2b that divides chamber diaphragm 23 below. The pilot chamber 2a communicates with the two solenoid valves F, and the balance chamber 2b communicates with the first working port 3 b. The two solenoid valves F include an intake solenoid valve F1 and an exhaust solenoid valve F2. When the air pressure data detected by the pressure sensor 6 is lower than the air pressure set value, the air intake solenoid valve F1 is controlled by the circuit board 7 to start working, starts supplying air into the pilot chamber 2a of the pilot valve 2, unbalance the pressure between the pilot chamber 2a and the balance chamber 2b of the pilot valve 2, and causes the sub-chamber diaphragm 23 to elastically deform and move downward. When the air pressure data detected by the pressure sensor 6 is higher than the air pressure set value, the air exhaust solenoid valve F2 is controlled by the circuit board 7 to start working, so as to exhaust the gas in the pilot chamber 2a of the pilot valve 2, and unbalance the pressure between the pilot chamber 2a and the balance chamber 2b of the pilot valve 2, thereby causing the sub-chamber diaphragm 23 to elastically deform and move upwards. The cavity-separating membrane 23 is connected with a push rod 24 for driving the air inlet valve set 4 and the air outlet valve set 5 to move. When the cavity-dividing diaphragm 23 elastically deforms and moves downwards, the cavity-dividing diaphragm 23 can drive the push rod 24 to move downwards, so that the push rod 24 pushes the air inlet valve group 4 to move downwards to open an air inlet channel, and therefore external high-pressure air can be fed into an air pressure system of the equipment through the air inlet 3a and the first working port 3 b. When the cavity separating membrane 23 is elastically deformed upwards to move, the cavity separating membrane 23 can drive the push rod 24 to move upwards, so that the push rod 24 pulls the exhaust valve group 5 to move upwards to open an exhaust channel, and therefore gas in the equipment air pressure system can be exhausted to the outside through the first working opening 3b and the exhaust opening 3 c.

The utility model discloses an automatically controlled accurate air-vent valve is when using, and the user need set up an atmospheric pressure setting value in advance, and circuit board 7 just can calculate the atmospheric pressure data that atmospheric pressure setting value and pressure sensor 6 detected constantly like this and compare, if under-voltage circuit board 7 just controls air inlet solenoid valve F1 and admits air, if overpressure circuit board 7 just controls exhaust solenoid valve F2 step-down. The pressure of the air pressure system of the equipment can be quickly brought to a required stable state.

In the embodiment, the main valve 3 includes a main valve body 31 and a lower valve body 32 covering the lower end of the main valve body 31; the intake port 3a, the exhaust port 3c, the first working port 3b, and the blind through-hole 3d are formed in the main valve body 31, and are sequentially arranged on the main valve body 31 at 90 degrees intervals. The main valve body 31 and the lower valve body 32 are both made of metal materials, and a balance feedback groove 3e and a pilot inlet groove 3f are also formed in the main valve body 31. The balance feedback groove 3e is used for communicating the first working port 3b with the balance cavity 2b of the pilot valve 2. The pilot inlet tank 3f is connected to the inlet port 3 a. In order to guarantee the service life of the valve, the utility model discloses an all install the cassette L that is arranged in filtering impurity in the gas in balanced feedback groove 3e and the guide's air inlet duct 3 f.

In the embodiment, the exhaust valve group 5 and the intake valve group 4 are coaxially disposed up and down in the valve cavity of the main valve body 31, and the exhaust valve group 5 includes an exhaust valve 51 which is in sealing fit with the exhaust valve opening of the exhaust passage, and an exhaust valve spring 52 which presses the exhaust valve 51 by using elastic force to realize the sealing of the exhaust valve opening. The intake valve group 4 includes an intake valve 41 which is in sealing fit with an intake valve port of the intake passage, and an intake valve spring 42 which presses the intake valve 41 with an elastic force to seal the intake valve port. The sealing end surfaces of the air inlet valve 41 and the air outlet valve 51 are both coated with flexible rubber layers, the lower end of the push rod 24 slidably passes through the air outlet valve spring 52 and the air outlet valve 51, the bottom end surface of the push rod 24 is a top pressure plane 242 in top contact fit with the air inlet valve 41, the push rod 24 can push the air inlet valve 41 to compress the air inlet valve spring 42 to move downwards through the top pressure plane 242 to open an air inlet valve port, and when the air inlet valve 41 loses the pushing force of the push rod 24, the air inlet valve 41 can reset under the elastic force of the air inlet valve spring 42 to enable the air inlet valve port to be in a sealing state. The push rod 24 is clamped with an annular retainer ring 25, and the diameter of the annular retainer ring 25 is larger than that of the central small hole of the exhaust valve 51, so that when the push rod 24 drives the annular retainer ring 25 to synchronously move upwards, the annular retainer ring 25 can pull the exhaust valve 51 to compress the exhaust valve spring 52 to move upwards to open the exhaust valve port. When the push rod 24 moves the exhaust valve 51 downwards to lose the pulling force of the annular retainer ring 25, the exhaust valve 51 can be reset under the elastic force of the exhaust valve spring 52, so that the exhaust valve port is in a sealed state. The upper end of the push rod 24 is also formed with an enlarged head 241 for the anti-slip connection with the chambered diaphragm 23.

In order to facilitate the assembly and the processing, the pilot valve body of the utility model consists of an upper pilot valve body 21 and a lower pilot valve body 22 which are matched up and down; the inner cavity of the pilot valve body is formed by an inner space formed by covering and combining the upper pilot valve body 21 and the lower pilot valve body 22. As shown in fig. 9, the chambered diaphragm 23 is a circular rubber diaphragm, which is formed with a pressure receiving area 231 of an inner circular portion, an elastic deformation area 232 surrounding the pressure receiving area 231, and an annular crimp portion 233 surrounding the elastic deformation area 232. The annular crimp portion 233 is press-fitted and fixed between the upper pilot valve body 21 and the lower pilot valve body 22 to achieve mutual isolation of the pilot chamber 2a and the balance chamber 2 b. The elastic deformation flexure 232 is a concave arc structure, so that the pressure bearing area 231 can elastically deform and move after bearing pressure. The pressure-bearing area 231 is fixed with a pressure-bearing sheet for ensuring the pressure-bearing uniformity of the pressure-bearing area 231 by using a pressure-bearing screw Y, and the pressure-bearing sheet is a metal sheet and comprises an upper pressure-bearing sheet 26 positioned on the upper surface of the pressure-bearing area 231 and a lower pressure-bearing sheet 27 positioned on the lower surface of the pressure-bearing area 231. The pressure-bearing piece provides a certain rigidity to the pressure-bearing zone 231. The upper pressure bearing sheet 26 and the lower pressure bearing sheet 27 are matched and formed to form an enlarged head accommodating cavity for connecting the cavity-dividing membrane 23 and the push rod 24; the enlarged head 241 of the push rod 24 is clamped in the enlarged head receiving cavity formed by the upper and lower pressure bearing pieces 26 and 27. The push rod 24 is connected with the cavity-dividing membrane 23 through a pressure-bearing sheet. The lower surface of the lower pressure bearing plate 27 abuts against a diaphragm spring 29.

In the embodiment, the lower pilot valve body 22 of the pilot valve body is fixedly connected with the main valve body 31, and a first sealing ring M1 is pressed between the connection of the lower pilot valve body 22 and the main valve body 31; the lower pilot valve body 22 is formed with a boss portion 221 extending into an upper portion of the valve chamber of the main valve body 31, and the boss portion 221 is formed with a slide hole through which the push rod 24 slides. The upper part of the sliding hole is provided with a guide sleeve 28 which is sleeved with the push rod 24, and the guide sleeve 28 is used for providing a guide function for the up-and-down movement of the push rod 24 so as to ensure the moving stability of the push rod 24. A second sealing ring M2 is installed in the guide sleeve 28 to prevent gas leakage from the balance chamber 2 b. The exhaust valve 51 is formed with a barrel 511 for housing the exhaust valve spring 52, the exhaust valve spring 52 is housed in the barrel 511, and the barrel 511 can prevent the exhaust valve spring 52 from deforming. The outer circumferential surface of the tub portion 511 is slidably engaged with a slide hole of the lower pilot valve body 22 up and down, and the slide hole can provide a guide for the up and down movement of the exhaust valve 51. The upper end of the exhaust valve spring 52 is connected with the lower end of the guide sleeve 28, the lower end of the exhaust valve spring 52 is connected with the annular surface at the bottom end of the barrel body 511, and a third sealing ring M3 which is in sealing fit with the barrel body 511 is arranged in the sliding hole.

In the embodiment, a main valve seal 33 is press-fitted between the lower valve body 32 and the main valve body 31, and a guide hole 32a is formed in the center of the lower valve body 32. The intake valve 41 is formed with a sleeve portion 411 for housing the intake valve spring 42, the intake valve spring 42 is housed in the sleeve portion 411, and the sleeve portion 411 has the same function as the barrel portion 511 of the exhaust valve 51. The outer peripheral surface of the sleeve 411 is slidably guided and fitted into the guide hole 32a of the lower valve body 32, the upper end of the intake valve spring 42 abuts against the inner peripheral surface of the sleeve 411, the lower end of the intake valve spring 42 abuts against the bottom wall of the guide hole 32a, and the sleeve 411 is fitted with an O-ring 43 for sealing.

In the embodiment, the electric control valve 1 of the present invention includes a solenoid valve base 12 and a housing 11 covering the solenoid valve base 12. A shell sealing ring M4 is pressed between the shell 11 and the electromagnetic valve base 12; the electromagnetic valve base 12 is fixedly connected with an upper pilot valve body 21 of the pilot valve body by bolts. A polygonal sealing ring M5 is press-fitted between the solenoid valve base 12 and the upper pilot valve body 21. The four corners of the upper pilot valve body 21 are respectively embedded with a copper insert T with threads, so that the threads of the copper insert T can be used for realizing connection with a bolt.

As can be seen from fig. 2, the intake solenoid valve F1 and the exhaust solenoid valve F2 are fixed on the solenoid valve base 12 in bilateral symmetry, a PCB holder 71 is fixedly mounted on the solenoid valve base 12, the circuit board 7 is mounted on the PCB holder 71, a button 8 and an adjusting knob 9 are respectively mounted on the top surface of the housing 11, the button 8 is connected with a switch button on the circuit board 7 in a press contact manner, and the adjusting knob 9 drives an encoder on the circuit board 7 to rotate through the connecting shaft 91. The encoder has three states, left-turn, right-turn and stationary. The switch knob is only pressed and lifted.

A pressure feedback groove 12a is formed in the solenoid valve base 12, the pressure sensor 6 is mounted in the pressure feedback groove 12a, and feedback air passages for communicating the first working port 3b with the pressure feedback groove 12a are formed in the main valve body 31 and in the upper pilot valve body 21 and the lower pilot valve body 22.

An inserting needle plate 72 is fixedly arranged in the electromagnetic valve base 12 through an inserting needle plate pressing frame 73, a male inserting column for being connected with an external electric female plug in an inserting mode is arranged on the inserting needle plate 72, and the male inserting column is connected with the circuit board 7 through a circuit; the electromagnetic valve base 12 is provided with a protection nozzle 121 for protecting the male plug, and the outer peripheral surface of the protection nozzle 121 is provided with an external thread which can be in screw fit with a nut.

The utility model discloses can be through the pressure of the first working port 3b of pressure sensor 6 real-time detection, if under-voltage circuit board 7 then control the solenoid valve that admits air and pressurize the guide's chamber. If the pressure is over-pressure, the circuit board 7 controls the exhaust electromagnetic valve to reduce the pressure of the pilot cavity, and if the pressure is just within the set pressure value, the exhaust electromagnetic valve and the air inlet electromagnetic valve do not act. The utility model discloses a valve can supply traditional precision control valve's use defect, reaches multiple spot quick control, and the precision is higher.

While the preferred embodiments of the present invention have been illustrated, various changes and modifications may be made by those skilled in the art without departing from the scope of the present invention.

Claims (10)

1. An electric control precision pressure regulating valve is formed by assembling an electric control valve (1), a pilot valve (2) and a main valve (3) into a whole in an overlapping way; the main valve (3) is formed with an air inlet (3a), a first working port (3b) and an exhaust port (3 c); the method is characterized in that: an air inlet valve group (4) for controlling the on-off of an air inlet channel between the air inlet (3a) and the first working port (3b) and an air outlet valve group (5) for controlling the on-off of an air outlet channel between the air outlet (3c) and the first working port (3b) are arranged in the valve cavity of the main valve (3); the electronic control valve (1) is internally provided with a pressure sensor (6) for detecting the air pressure of the first working port (3b) in real time, a circuit board (7) connected with a feedback circuit of the pressure sensor (6) and two electromagnetic valves (F) controlled by the circuit board (7), the pilot valve (2) comprises a pilot valve body and a cavity-dividing diaphragm (23) arranged in an inner cavity of the pilot valve body, and the cavity-dividing diaphragm (23) divides the inner cavity of the pilot valve body into a pilot cavity (2a) positioned above the cavity-dividing diaphragm (23) and communicated with the two electromagnetic valves (F) and a balance cavity (2b) positioned below the cavity-dividing diaphragm (23) and communicated with the first working port (3 b); two solenoid valve (F) including one be arranged in to leading chamber (2a) air feed force minute chamber diaphragm (23) intake solenoid valve (F1) that elastic deformation moved downwards and one be arranged in with leading the gaseous exhaust solenoid valve (F2) that the elastic deformation moved upwards of chamber diaphragm (23) of discharging in chamber (2a), minute chamber diaphragm (23) be connected with push rod (24), this push rod (24) promote intake valve group (4) and open inlet channel under the drive that elastic deformation moved downwards of minute chamber diaphragm (23), this push rod (24) are in minute chamber diaphragm (23) drive that elastic deformation moved upwards and are pulled exhaust valve group (5) and open exhaust channel.

2. An electrically controlled precision pressure regulating valve according to claim 1 wherein: the main valve (3) comprises a main valve body (31) and a lower valve body (32) which is covered at the lower end of the main valve body (31); the air inlet (3a), the air outlet (3c) and the first working port (3b) are all formed on the main valve body (31) and are sequentially arranged on the main valve body (31) at intervals of 90 degrees; a balance feedback groove (3e) for communicating the first working port (3b) with a balance cavity (2b) of the pilot valve (2) and a pilot air inlet groove (3f) connected with the air inlet (3a) are formed in the main valve body (31); and filter sheets (L) for filtering impurities in the gas are arranged in the balance feedback groove (3e) and the pilot air inlet groove (3 f).

3. An electrically controlled precision pressure regulating valve according to claim 2 wherein: the exhaust valve group (5) and the intake valve group (4) are coaxially arranged up and down in a valve cavity of the main valve body (31), the exhaust valve group (5) comprises an exhaust valve (51) in sealing fit with an exhaust valve port of an exhaust passage and an exhaust valve spring (52) for pressing the exhaust valve (51) by elasticity to realize the sealing of the exhaust valve port, the intake valve group (4) comprises an intake valve (41) in sealing fit with an intake valve port of an intake passage and an intake valve spring (42) for pressing the intake valve (41) by elasticity to realize the sealing of the intake valve port, the lower end of the push rod (24) slidably penetrates through the exhaust valve spring (52) and the exhaust valve (51), the bottom end surface of the push rod (24) is a pressing plane (242) for pushing the intake valve (41) to compress the intake valve spring (42) to move downwards to open the intake valve port, an annular retainer ring (25) for driving an exhaust valve (51) to compress an exhaust valve spring (52) and move upwards to open an exhaust valve port is clamped on the push rod (24), and an enlarged head part (241) connected with the cavity-separating diaphragm (23) in a falling-proof manner is formed at the upper end of the push rod (24).

4. An electrically controlled precision pressure regulating valve according to claim 3 wherein: the pilot valve body consists of an upper pilot valve body (21) and a lower pilot valve body (22) which are matched up and down; the inner cavity of the pilot valve body is formed by an inner space formed by covering an upper pilot valve body (21) and a lower pilot valve body (22); the cavity-dividing diaphragm (23) is formed with a pressure-bearing area (231) with an inner circular part, an elastic deformation area (232) surrounding the pressure-bearing area (231) and an annular crimping part (233) surrounding the elastic deformation area (232); the annular crimping part (233) is fixedly pressed between the upper pilot valve body (21) and the lower pilot valve body (22), a pressure-bearing sheet for ensuring the pressure-bearing uniformity of the pressure-bearing area (231) is fixed on the pressure-bearing area (231) by adopting a pressure-bearing screw (Y), and the pressure-bearing sheet comprises an upper pressure-bearing sheet (26) positioned on the upper surface of the pressure-bearing area (231) and a lower pressure-bearing sheet (27) positioned on the lower surface of the pressure-bearing area (231); the upper pressure bearing sheet (26) and the lower pressure bearing sheet (27) are matched to form an expanded head accommodating cavity for connecting the cavity-dividing membrane (23) and the push rod (24); the expanding head (241) of the push rod (24) is clamped in an expanding head accommodating cavity formed by the upper pressure bearing sheet (26) and the lower pressure bearing sheet (27), and the lower surface of the lower pressure bearing sheet (27) is abutted with the diaphragm spring (29).

5. An electrically controlled precision pressure regulating valve according to claim 4 wherein: a lower pilot valve body (22) of the pilot valve body is fixedly connected with the main valve body (31), and a first sealing ring (M1) is pressed between the connection of the lower pilot valve body (22) and the main valve body (31); the lower pilot valve body (22) is formed with a convex opening (221) extending into the main valve body (31), the convex opening part (221) is provided with a sliding hole for the push rod (24) to pass through, the upper part of the sliding hole is provided with a guide sleeve (28) which is matched with the push rod (24) and used for providing guide for the up-and-down movement of the push rod (24), a second sealing ring (M2) is installed in the guide sleeve (28), a barrel body part (511) for sleeving the exhaust valve spring (52) is formed on the exhaust valve (51), the outer circumference of the barrel body part (511) is matched with the slide hole of the lower pilot valve body (22) in a vertical sliding way, the upper end of the exhaust valve spring (52) is connected with the lower end of the guide sleeve (28), the lower end of the exhaust valve spring (52) is connected with the annular surface at the bottom end of the barrel part (511) in an abutting mode, and a third sealing ring (M3) which is in sealing fit with the barrel body part (511) is arranged in the sliding hole.

6. An electrically controlled precision pressure regulating valve according to claim 5 wherein: the main valve sealing ring (33) is pressed between the connection of the lower valve body (32) and the main valve body (31), a guide hole (32a) is formed in the center of the lower valve body (32), a sleeve portion (411) for sleeving an air inlet valve spring (42) is formed in the air inlet valve (41), the outer peripheral surface of the sleeve portion (411) is matched with the guide hole (32a) of the lower valve body (32) in a sliding guide mode, the upper end of the air inlet valve spring (42) is abutted to the inner annular surface of the sleeve portion (411), the lower end of the air inlet valve spring (42) is abutted to the bottom wall of the guide hole (32a), and an O-shaped ring (43) for sealing is sleeved on the sleeve portion (411).

7. An electrically controlled precision pressure regulating valve according to claim 6 wherein: the electric control valve (1) comprises an electromagnetic valve base (12) and a shell (11) covered on the electromagnetic valve base (12), and a shell sealing ring (M4) is arranged between the shell (11) and the electromagnetic valve base (12) in a pressing mode; the electromagnetic valve base (12) is fixedly connected with an upper pilot valve body (21) of the pilot valve body by bolts; the upper pilot valve body (21) is embedded with a copper insert (T) with threads, and a polygonal sealing ring (M5) is arranged between the electromagnetic valve base (12) and the upper pilot valve body (21) in a pressing mode.

8. An electrically controlled precision pressure regulating valve according to claim 7 wherein: air inlet solenoid valve (F1) and exhaust solenoid valve (F2) bilateral symmetry fix on solenoid valve base (12) to fixed mounting has PCB mount (71) on this solenoid valve base (12), circuit board (7) install on PCB mount (71), the top surface of shell (11) install button (8) and adjust knob (9) respectively, button (8) be connected with the switch button press the contact on circuit board (7), adjust knob (9) drive the encoder rotation on circuit board (7) through connecting axle (91).

9. An electrically controlled precision pressure regulating valve according to claim 8 wherein: a pressure feedback groove (12a) is formed in the electromagnetic valve base (12), the pressure sensor (6) is installed in the pressure feedback groove (12a), and feedback air passages for communicating the first working port (3b) with the pressure feedback groove (12a) are formed in the main valve body (31), the upper pilot valve body (21) and the lower pilot valve body (22).

10. An electrically controlled precision pressure regulating valve according to claim 9 wherein: an inserting needle plate (72) is fixedly arranged in the electromagnetic valve base (12) through an inserting needle plate pressing frame (73), a male inserting column which is used for being connected with an external power female plug in an inserting mode is arranged on the inserting needle plate (72), and the male inserting column is connected with a circuit board (7) through a circuit; the solenoid valve base (12) on process and be used for protecting the public protection mouth (121) of inserting the post, the outer peripheral face of protection mouth (121) process have can with nut screw complex external screw thread.

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