Novel pneumatic diaphragm regulating valve

Abstract

A novel pneumatic diaphragm regulating valve belongs to the technical field of valves and comprises a diaphragm regulating valve body, a pressure sensor, a liquid leakage sensor, a linear adjustable resistor, a comparison circuit and an alarm circuit. A fixing hole is formed in the rear upper end of a shell of the thin film adjusting valve body, and a liquid inlet pipe of the pressure sensor is installed in the fixing hole. A lower fixing rod is installed on one side of the upper end of a diaphragm of the diaphragm adjusting valve body, an upper fixing rod is installed on one side of the upper end in a shell, the upper end of an adjustable resistor is installed on the lower portion of the upper fixing rod, and an adjusting handle of the adjustable resistor and the upper end of the lower fixing rod are installed together. A probe of the liquid leakage sensor is installed on the rear side of the connecting shaft pipe of the thin film adjusting valve body, and the liquid leakage sensor, the comparison circuit and the alarm circuit are installed in the element box and electrically connected. When the diaphragm is damaged and liquid leakage exists between the connecting shaft and the connecting shaft pipe, a worker can be prompted to carry out maintenance, and adverse effects on normal work of production equipment applying the diaphragm regulating valve body are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve equipment technical field, especially a novel pneumatic diaphragm regulating valve. BACKGROUND

[0002] Pneumatic diaphragm regulating valve is a kind of common industrial control valve, the movement of diaphragm in valve is controlled by air pressure signal, and the regulation of fluid is realized.Pneumatic diaphragm regulating valve main structure includes valve seat, valve core, pneumatic device, valve core is vertically located in valve seat, pneumatic device includes connecting shaft, diaphragm, shell, diaphragm seal is located in the middle part of shell, connecting shaft upper end and diaphragm lower middle part are installed together, shell upper end side has inlet pipe.In specific working process, the pressure of compressed air entering the inside of shell is adjusted to control the flow of valve seat medium, when compressed air drives diaphragm to drive valve core to descend through connecting shaft, the flow passage in valve seat is relatively small, and the liquid medium flows into one end of valve seat and flows out from the other end at relatively small equal flow, when compressed air drives diaphragm to drive valve core to descend through connecting shaft, the flow passage in valve seat is relatively large, and the liquid medium flows into one end of valve seat and flows out from the other end at relatively large equal flow.

[0003] Although, existing pneumatic diaphragm regulating valve meets the flow control needs of fluid to some extent, but also still has some shortcomings due to structure limitation.Specifically, the performance of diaphragm is directly related to whether equipment can work normally, when diaphragm is damaged and leaks, compressed air cannot drive the diaphragm to descend, so the stroke of valve core cannot be controlled, leading to that the flow of liquid medium cannot be controlled by the whole equipment;Because diaphragm cannot prompt relevant personnel in first time when damaged, so maintenance cannot be carried out in time, which will lead to that the production equipment controlled by pneumatic diaphragm regulating valve works abnormally.In addition, when the connecting shaft pipe of valve seat is worn, and there is gap between connecting shaft and connecting shaft pipe, it cannot prompt relevant personnel in first time, which will cause adverse effects on on-site production.In summary, it is very necessary to provide a diaphragm regulating valve which can effectively monitor the performance of diaphragm and whether there is gap between connecting shaft and connecting shaft pipe. CONTENT OF UTILITY MODEL

[0004] In order to overcome the drawbacks of existing diaphragm regulating valve due to structure limitation as described in the background, the utility model provides a novel pneumatic diaphragm regulating valve based on diaphragm regulating valve body, which can monitor the performance of diaphragm in real time, prompt workers to repair in first time when diaphragm is damaged and there is leakage between connecting shaft and connecting shaft pipe, and minimize the adverse effects on the normal work of production equipment using diaphragm regulating valve body.

[0005] The technical scheme adopted by the utility model to solve its technical problems is:

[0006] The utility model provides a novel pneumatic diaphragm regulating valve, including diaphragm regulating valve body, pressure sensor, liquid leakage sensor, linear adjustable resistance still have comparison circuit and alarm circuit, the fixed hole of diaphragm regulating valve body's casing rear upper end has, and the liquid inlet pipe of pressure sensor installs in fixed hole, diaphragm regulating valve body diaphragm upper end one side installs lower fixed link, and the casing installs upper fixed link in upper end one side, and the upper end of adjustable resistance installs in the lower part of upper fixed link, and the upper end of adjustable resistance handle and lower fixed link installs together, the probe of liquid leakage sensor installs in diaphragm regulating valve body's connecting shaft pipe rear side, and liquid leakage sensor, comparison circuit and alarm circuit install in element box, the signal output end of adjustable resistance, pressure sensor and the two way signal input end of comparison circuit are electrically connected respectively, and the signal output end of comparison circuit, liquid leakage sensor and the signal input end of alarm circuit are electrically connected respectively.

[0007] Further, the outer rear side of the upper end of the connecting shaft tube of the diaphragm regulating valve body is provided with an insulating fixed plate, and the probe of the liquid leakage sensor is installed on the fixed plate.

[0008] Further, the comparison circuit comprises an operational amplifier, resistors and an adjustable resistor electrically connected, one end of the first resistor is connected with the same input end of the operational amplifier, one end of the adjustable resistor is connected with one end of the second resistor and the opposite input end of the operational amplifier, and the other end of the first resistor is connected with the negative power input end of the operational amplifier.

[0009] Further, the alarm circuit comprises resistors, a triode and a buzzer electrically connected, one end of the first resistor is connected with the base of the triode, the collector of the triode is connected with one end of the second resistor, the other end of the second resistor is connected with the control electrode of the thyristor, the emitter of the triode is connected with the anode of the thyristor, and the cathode of the thyristor is connected with the positive power input end of the buzzer.

[0010] Compared with the prior art, the utility model has the beneficial effects that: based on the diaphragm regulating valve body, when working, the pressure sensor, the adjustable resistor and the comparison circuit can monitor the performance of the diaphragm in real time, the liquid leakage sensor can monitor whether there is liquid leakage between the connecting shaft and the connecting shaft tube in real time, when the diaphragm is damaged at the first time and there is liquid leakage between the connecting shaft and the connecting shaft tube, the alarm circuit can prompt the staff to repair at the first time, thereby reducing the adverse effects on the normal work of the production equipment using the diaphragm regulating valve body as much as possible. Therefore, the utility model has good application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0011] The utility model will be further described below in combination with the drawings and examples.

[0012] Figure 1 The utility model is a circuit diagram.

[0013] Figure 2 The utility model discloses a whole structure and partial enlarged structure schematic diagram. DETAILED DESCRIPTION

[0014] Figure 1 、 2 As shown in the figure, the novel pneumatic diaphragm regulating valve, including diaphragm regulating valve body 1, power module W1, pressure sensor W3, liquid leakage sensor W2, linear adjustable resistance RP1, still have comparison circuit 2 and alarm circuit 3;The shell 102 of diaphragm regulating valve body 1 has a silk hole in the middle of upper end, and the liquid inlet pipe of pressure sensor W3 is screwed into the silk hole, and then the liquid inlet pipe of pressure sensor W3 is installed in the silk hole;The lower fixed rod 4 is fixedly installed on the right side of the upper end of diaphragm regulating valve body diaphragm 104, and the upper fixed rod 5 is fixedly installed on the right part of the upper end in the shell 102, and the upper end of adjustable resistance RP1 is fixedly installed on the lower part of the upper fixed rod 5, and the left side end of the adjusting handle of adjustable resistance RP1 is fixedly installed with a pull plate 6, and the lower end of pull plate 6 and the upper end of lower fixed rod 4 are fixedly installed together;The probe 7 of liquid leakage sensor is fixedly installed on the rear side of the upper end of connecting shaft pipe 101 of diaphragm regulating valve body, power module W1, liquid leakage sensor W2, comparison circuit 2 and alarm circuit 3 are installed in component box 8, and component box 8 is sealingly installed in the right upper end of shell 102;The power input end 1 and 2 feet of power module W1 and the two poles of alternating current 220V power supply are connected through wires respectively, the power output end 3 and 4 feet of power module W1 and the power input end 1 and 2 feet of pressure sensor W3, the power input end of alarm circuit controllable silicon VS control electrode and the negative electrode power input end of alarm circuit BX, the power input end of comparison circuit operational amplifier W4 7 and 4 feet, the power input end 1 and 2 feet of liquid leakage sensor W2, one end of adjustable resistance RP1 is connected through wires, the other end of adjustable resistance RP1 and one end of resistance R1 are connected through wires, the signal output end 3 feet of pressure sensor W3 and the signal input end adjustable resistance RP2 the other end are connected through wires, the signal output end of comparison circuit operational amplifier W4 6 feet and the signal input end resistance R3 the other end of alarm circuit are connected through wires, the signal output end 3 feet of liquid leakage sensor W2 and the control end resistance R4 the other end of alarm circuit are connected through wires.

[0015] Figure 1 、 2As shown, the thin film regulating valve body connecting shaft pipe 101 upper end rear side outside horizontal fixed installation has an insulating fixed plate 9, the leakage sensor split type probe 7 horizontal fixed installation on the fixed plate 9 (the probe two metal sheets contact fixed plate 9). The comparison circuit includes the operational amplifier W4, resistors R1 and R2, and adjustable resistor RP2 connected by the circuit board. The first resistor R1 is connected to the same input terminal 3 of the operational amplifier W4, and the adjustable resistor RP2 is connected to the second resistor R2 and the reverse input terminal 2 of the operational amplifier W4. The other end of the first resistor R1 is connected to the negative power input terminal 4 of the operational amplifier W4. The alarm circuit includes resistors R3 and R4, triode Q1, and buzzer BX connected by the circuit board. The first resistor R3 is connected to the base of the triode Q1, and the collector of the triode Q1 is connected to the first end of the second resistor R4. The other end of the second resistor R4 is connected to the control electrode of the thyristor VS, and the emitter of the triode Q1 is connected to the anode of the thyristor VS. The cathode of the thyristor VS is connected to the positive power input terminal of the buzzer BX. Figure 2 In the experiment, the power module W1 is an AC 220V to DC 12V power module finished product; the adjustable resistors RP1 and RP2 have a resistance of 100K (adjusted to 36.5K and 42.8K respectively); the resistors R1, R2, R3, and R4 have resistances of 4.7K, 4.7K, 10K, and 4.7K respectively; the triode Q1 is a PNP type triode with model number 9012; the thyristor VS is a plastic encapsulated unidirectional thyristor with model number MCR100-7; the buzzer BX is an active continuous sound alarm with model number FQ12V; the operational amplifier W4 is a UA741 type operational amplifier; and the pressure sensor W3 is a FY-888A type pressure transmitter finished product with two power input terminals and one signal output terminal. The greater the detected pressure, the higher the voltage output by the signal output terminal, and vice versa. The leakage sensor W2 is an HPQ-D11N type leakage detection sensor with two power input terminals and one signal output terminal. When leakage is detected, the signal output terminal outputs a voltage signal, and vice versa.

[0016] Figure 1 、 2The new type is based on the film regulating valve body 1. In operation, the flow of the valve seat 103 is controlled by adjusting the pressure of the compressed air entering the shell 102. When the compressed air drives the diaphragm 104 to move the valve core 105 downward with a relatively large interval through the connecting shaft, the valve seat 103 channel is relatively small, and the flow of the liquid medium flowing out of the other end of the valve seat 103 is relatively small. When the compressed air drives the diaphragm 104 to move downward with a relatively small interval through the connecting shaft (the springs on both sides of the shell make the diaphragm move upward), the valve seat 103 channel is relatively large, and the flow of the liquid medium flowing out of the other end of the valve seat 103 is relatively large. The above is a mature technology, and the present application does not repeat the description and does not protect the above technical solution. In the present application, after the 220V AC power supply enters the power input end of the power supply module W1, the stable DC 12V power supply of the power supply module W1 is output to the power input end of the comparison circuit, the alarm circuit, and the pressure sensor. When the amount of compressed air entering the upper end of the shell of the film regulating valve body 1 is relatively large, and the pressure on the diaphragm is relatively large, the pressure voltage signal output by the 3-pin of the pressure sensor W3 is relatively large, and vice versa (when the amount of compressed air entering the upper end of the shell is reduced, the diaphragm moves upward under the elastic force of the spring 106 of the film regulating valve body 1). The pressure signal is divided by the adjustable resistor RP2 and the resistor R2 and enters the 2-pin of the operational amplifier W4. During the downward or upward movement of the diaphragm, the lower fixed rod 4 drives the handle of the adjustable resistor RP1 to move downward or upward, so that the resistance value of the adjustable resistor RP1 changes synchronously. In this way, the voltage signal voltage of the 3-pin of the operational amplifier W4, which is divided by the 12V power supply and the adjustable resistor RP1 and the resistor R1, is relatively large or relatively small. When the diaphragm is not damaged and the diaphragm normally drives the handle of the adjustable resistor RP1 to move downward, the voltage signal output by the 3-pin of the pressure sensor W3 is divided by the adjustable resistor RP2 and the resistor R2 and enters the 2-pin of the operational amplifier W4. The voltage is lower than the voltage of the 3-pin of the operational amplifier W4, which is divided by the 12V power supply and the adjustable resistor RP1 and the resistor R1. Therefore, the 6-pin of the operational amplifier W4 outputs a high level, so that the triode Q1 does not conduct, and the siren BX does not get electricity and sound. It represents that the diaphragm is not damaged (or has not leaked liquid).When the diaphragm is damaged, since air can enter the lower end of the diaphragm 104, the diaphragm cannot normally drive the handle of the adjustable resistor RP1 downward (or the downward distance is relatively small), at this moment, the voltage signal output by the 3-pin of the pressure sensor W3 is divided by the adjustable resistor RP2 and the resistor R2 and enters the 2-pin voltage of the operational amplifier W4, since the pressure of the compressed air does not change, the voltage does not change, the downward distance of the handle of the adjustable resistor RP1 is relatively small, the resistance value is relatively large (the voltage division between the resistor R1 is large), the 3-pin voltage entering the operational amplifier W4 is lower than the 2-pin voltage of the operational amplifier, thus, the low level output by the 6-pin of the operational amplifier W4 enters the base of the transistor Q1 through the resistor R3, the transistor Q1 is turned on, the high level output by the collector is limited by the resistor R4, and the thyristor VS is triggered to be turned on, thus, the alarm BX is powered to sound to prompt the nearby staff that the diaphragm is damaged or there is a gap between the connecting shaft and the connecting shaft pipe. In actual work, when there is no leakage between the connecting shaft and the connecting shaft pipe 101 of the diaphragm regulating valve body 1 (mainly for detecting liquid with conductive properties, such as water), the split probe of the leakage sensor W2 does not detect the leakage, the 3-pin of the leakage sensor W2 does not output a high level, thus, the thyristor VS cannot be turned on, and the alarm BX cannot sound, which represents that there is no gap between the connecting shaft and the connecting shaft pipe 101 (or the diaphragm is not damaged); when there is a gap between the connecting shaft and the connecting shaft pipe 101 of the diaphragm regulating valve body 1, the split probe of the leakage sensor W2 detects the leakage, the 3-pin of the leakage sensor W2 outputs a high level, the resistor R4 limits the voltage drop, the thyristor VS is triggered to be turned on, thus, the alarm BX is powered to sound to prompt the nearby staff that the diaphragm is damaged or there is a gap between the connecting shaft and the connecting shaft pipe (or the diaphragm is damaged). Through the above, the diaphragm regulating valve body of the present application can monitor the performance of the diaphragm and whether there is a gap between the connecting shaft and the connecting shaft pipe in real time, when the diaphragm is damaged at the first time and when there is a gap between the connecting shaft and the connecting shaft pipe, the alarm circuit can prompt the staff to repair at the first time, and the adverse effects on the normal work of the production equipment using the diaphragm regulating valve body are reduced as much as possible.

[0017] The basic principle and main features of the present application and the advantages of the present application are shown and described above. It is obvious for those skilled in the art that the present application is limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

[0018] Furthermore, it should be understood that, although the specification is described in terms of embodiments, the embodiments do not include only singular implementations, but that the specification can include plural implementations of individual systems, other combined systems, and methods described herein.

Claims

1. A new type of pneumatic diaphragm control valve, comprising a diaphragm control valve body, a pressure sensor, a liquid leakage sensor, a linear adjustable resistor, characterized in that, It also has comparison circuit and alarm circuit; the shell rear upper end of the diaphragm regulating valve body has a fixed hole, the liquid inlet pipe of the pressure sensor is installed in the fixed hole; the lower fixed rod is installed on one side of the diaphragm regulating valve body membrane upper end, the upper fixed rod is installed on one side of the shell inner upper end, the upper end of the adjustable resistor is installed on the lower part of the upper fixed rod, the adjustable resistor handle and the lower fixed rod upper end are installed together; the probe of the liquid leakage sensor is installed on the rear side of the connecting shaft pipe of the diaphragm regulating valve body, the liquid leakage sensor, the comparison circuit and the alarm circuit are installed in the element box; the adjustable resistor, the signal output end of the pressure sensor and the two-way signal input end of the comparison circuit are respectively electrically connected, the signal output end of the comparison circuit and the signal input end of the alarm circuit are respectively electrically connected.

2. The new generation of aerodynamic thin film regulating valve according to claim 1, characterized in that, The probe of the liquid leakage sensor is installed on the fixed plate.

3. The new generation of aerodynamic thin film control valve according to claim 1, characterized in that, The comparison circuit includes operational amplifier, resistors and adjustable resistor which are electrically connected, the same direction input end of the operational amplifier and one end of the first resistor are connected, one end of the adjustable resistor and one end of the second resistor and the reverse input end of the operational amplifier are connected, the other end of the first resistor and the negative power input end of the operational amplifier are connected.

4. The new generation of aerodynamic thin film control valve according to claim 1, characterized in that, The alarm circuit includes resistors, triode and siren which are electrically connected, one end of the first resistor and the base of the triode are connected, the collector of the triode and one end of the second resistor are connected, the other end of the second resistor and the control electrode of the thyristor are connected, the emitter of the triode and the anode of the thyristor are connected, the cathode of the thyristor and the positive power input end of the siren are connected.

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