CN104740819A - Diaphragm type constant-pressure rain falling alarm valve - Google Patents

Abstract

Diaphragm constant pressure deluge alarm valve, including the deluge valve (2), the deluge valve (2) is equipped with a diaphragm chamber (1), the diaphragm chamber (1) is connected in series with the pressure control valve (9), and the pressure control valve (9 ) is connected in parallel with the deluge valve (2) outlet, and the pressure control valve (9) is connected in series with the solenoid valve (8). The present invention sets a pressure control valve (9) to control the opening of the deluge valve (2) by automatically adjusting the opening of the outlet of the pressure control valve (9) so that the outlet pressure of the deluge valve (2) is always kept at the set value. The tolerance range of the value, thus avoiding various disadvantages caused by unstable working pressure.

Description

Diaphragm constant pressure deluge alarm valve

technical field

The invention relates to a deluge alarm valve, in particular to a diaphragm type constant pressure deluge alarm valve.

Background technique

Diaphragm deluge alarm valve uses a diaphragm to separate the main valve into a diaphragm cavity and a pressure input cavity, and uses the difference in the pressure area of the two cavities to generate a water pressure difference to realize the sealing of the main valve.

In the servo state, the diaphragm cavity and the pressure input cavity are filled with water, and the diaphragm assembly is pressed by the pressure difference and spring force, and the gravity of the piston and other components to achieve sealing.

When working, the electronic control device sends an action signal to the solenoid valve connected in series on the pressure relief pipeline of the diaphragm chamber after signal processing, the solenoid valve opens, the diaphragm chamber releases pressure, and the deluge valve automatically opens to connect the water supply side and the system side. The pressure water drives the hydraulic alarm bell through the alarm pipeline, triggers the action of the pressure switch, starts the fire pump, stops the pressure stabilizing pump, and the rest of the pressure water is sprayed from the open nozzle at the end of the pipe network to the protected area, finally realizing fire extinguishing, fire control, The purpose of cooling and sending out alarm signals.

When the existing deluge alarm valve is working, the working pressure on the system side directly depends on the input pressure on the water supply side. When the input pressure is unstable, the working pressure on the system side is also unstable, resulting in poor reliability of the system.

In practical engineering applications, the pressure loss of the system pressure transported to each protection area is different. Usually, the longer the pipeline, the greater the pressure loss. Therefore, in engineering design, the system pressure is designed according to the most unfavorable parameter, that is, the pressure loss The working pressure value required for the largest protection zone, plus the pressure loss value to determine the design value of the system output pressure.

After the system accepts the work order, the deluge alarm valve is fully open. Due to the small pressure loss value near the protection zone, the actual working pressure at the spraying device will be much higher than the design working pressure, which will not only affect the spraying characteristics of the spraying device, shorten the service life of the spraying device, but also increase the flow rate output, increased water waste and water pollution.

Since the engineering water storage design of the system is designed according to the maximum flow required by the protection zone, the increase of the maximum flow required by the protection zone will inevitably lead to an increase in the volume of the storage tank, thereby increasing the cost of engineering development.

The defect of known technology has increased no small resistance to the extensive popularization and application of diaphragm type deluge alarm valve technology in the fire protection industry.

Contents of the invention

The invention provides a diaphragm type constant pressure deluge alarm valve aiming at the disadvantage of unstable working pressure of the diaphragm type deluge alarm valve in the prior art.

In order to solve the above technical problems, the present invention is solved through the following technical solutions:

Diaphragm constant pressure deluge alarm valve, including deluge valve, the deluge valve is equipped with a diaphragm cavity, the diaphragm cavity is connected in series with the pressure control valve, the pressure control valve is connected in parallel with the outlet of the deluge valve, and the pressure control valve is connected in series with the solenoid valve. In the servo state, the deluge valve acts on the diaphragm chamber by means of the water supply pressure, and the sealing surface of the diaphragm chamber is tightly attached to the isolation layer in the deluge valve body, so that the deluge valve is in a closed state. When working, the solenoid valve connected in series to the pressure relief pipeline of the diaphragm chamber is energized and opened, the pressure of the diaphragm chamber is relieved, the deluge valve is opened, and the water supply side B and the system side C are connected to allow the fire pressure water to flow, and perform fire extinguishing, fire control, and cooling and call the police.

Preferably, the pressure control valve includes a valve body, the upper end of the valve body is provided with an upper end cover, the lower end of the valve body is provided with a lower end cover, the inside of the valve body is provided with a cavity, the upper part of the inner cavity is provided with a piston, and the lower part of the inner cavity is arranged sequentially from top to bottom. Limit sleeve, valve body spring, bottom plate. The pressure control valve is a slide valve direct acting structure. The design of the spring preload is related to the outlet pressure of the deluge valve, the adjustment length of the adjustment screw and the friction force of the seal.

Preferably, both sides of the valve body are respectively provided with an inlet and an outlet, and the waist of the piston is provided with an annular groove, one end of which is connected to the inlet and the other end is connected to the outlet. The inlet and outlet are connected by an annular groove.

Preferably, a control port is provided on one side of the valve body, a pressure groove is provided on the upper end cover, and the control port is connected to the pressure groove. The control port of the pressure control valve is connected to the outlet of the deluge valve. The outlet pressure of the deluge valve is used as the feedback pressure of the pressure control valve. Compared with the pre-pressure of the valve body spring in the pressure control valve, the opening of the outlet of the pressure control valve is automatically adjusted. Degree, to control the flow of the deluge valve, so as to achieve the purpose of constant output pressure.

When the manual emergency valve or the solenoid valve is opened, the pressure in the diaphragm chamber drops, and after the deluge valve is opened, the pressure control valve appears in the following states:

a. When the outlet pressure of the deluge valve is less than or equal to the design value, the thrust acting on the pressure groove on the upper part of the piston is compared with the preload of the valve body spring. It is connected with the outlet; the deluge valve continues to drain outward, the opening of the deluge valve increases, and the outlet pressure of the deluge valve rises;

b. When the outlet pressure of the deluge valve increases and is greater than the design value, the upper thrust of the piston is greater than the preload of the valve body spring, and the piston moves downward to reduce the amount of water flowing from the inlet to the outlet, and make it smaller than that from the restrictor hole The amount of water that the plate flows into the diaphragm cavity, the pressure of the deluge valve diaphragm cavity increases, the opening of the deluge valve decreases, and the outlet pressure of the deluge valve decreases accordingly; when the outlet pressure of the deluge valve decreases slowly to the design value, The piston stops moving, and the outlet pressure of the deluge valve remains constant.

Preferably, the limit sleeve is sleeved on the outside of the valve body spring, and a leakage hole is provided at the lower end of the limit sleeve. Limit excessive piston movement.

Preferably, an adjusting screw assembly is provided on the lower end cover, and the adjusting screw assembly passes through the lower end cover and is connected to the bottom plate. The adjusting screw assembly is screwed on the lower end cover, and its conical head is supported in the conical hole at the lower end of the bottom plate.

Preferably, the area of the annular groove is equal to the area of the inlet and smaller than the area of the outlet, and the width of the annular groove is larger than the width of the outlet, and the width of the outlet is larger than the width of the inlet.

Preferably, the lower end of the deluge valve is provided with an automatic drain valve, the top surface of the deluge valve is connected to a guide shaft, and the outside of the guide shaft is wrapped with a spring. The automatic drain valve is connected to the lower end of the system side C of the deluge valve body through threads, which is used to remove a small amount of leakage water and judge whether the deluge valve is open. It can automatically drain water under no water pressure, and can keep sealing under water pressure; the guide shaft is sealed and connected with the deluge valve cover through the sealing ring, which not only plays the role of coaxial guidance, but also cooperates with the spring to make the seal more reliable .

Preferably, the diaphragm cavity is connected in series with a manual emergency valve, and the diaphragm cavity is connected with a reset ball valve. The manual emergency valve is connected in series on the pressure relief pipeline of the diaphragm cavity, which is used to open the deluge valve device in an emergency, and the reset ball valve is used to reset the deluge valve. The diaphragm cavity is filled with water. When the pressure of the diaphragm cavity is equal to that of the water supply side B, the deluge valve is closed, and finally the reset ball valve is closed.

Preferably, a flow controller is provided in the deluge valve, and the flow controller is connected to the diaphragm chamber. The flow controller and diaphragm assembly are bolted inside the deluge valve body to control the outlet flow of the deluge valve, that is, to filter out the flow greater than the maximum protection area. It cooperates with the pressure control valve to increase the working pressure stability of the deluge valve (when the flow rate in the protection zone is greater than 2/3 of the rated flow rate of the deluge valve, no need to configure the flow controller).

Due to the adoption of the above technical scheme, the present invention has remarkable technical effects: the present invention sets a pressure control valve, and controls the opening of the main valve of the deluge valve by automatically adjusting the opening of the outlet of the pressure control valve to make the outlet pressure of the deluge valve Always keep within the tolerance range of the set value, thereby avoiding various disadvantages caused by unstable working pressure, enhancing the reliability of equipment use, saving equipment use costs and engineering development costs, and promoting the diaphragm deluge alarm valve. The promotion and application of technology in the fire protection industry.

Description of drawings

Fig. 1 is a structural sectional view of the present invention;

Fig. 2 is the A direction view of Fig. 1;

Fig. 3 is a sectional view of the pressure control valve;

Figure 4 is a working logic diagram of the deluge valve.

The names of the parts indicated by the numbers in the above drawings are as follows: 1—diaphragm chamber, 2—deluge valve, 3—guiding shaft, 4—flow controller, 5—automatic drain valve, 6—spring, 7— Manual emergency valve, 8—solenoid valve, 9—pressure control valve, 10—reset ball valve, 11—upper end cover, 12—valve body, 13—piston, 14—valve body spring, 15—lower end cover, 16—adjusting screw assembly , 17—limiting sleeve, 18—bottom plate, 19—pressure groove, 20—inlet, 21—outlet, 22—control port, 23—annular groove, 24—leakage hole, B—water supply side, C—system side.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Example

Diaphragm constant pressure deluge alarm valve, as shown in Fig. 1 to Fig. 2, includes deluge valve 2. Deluge valve 2 is equipped with diaphragm chamber 1, and deluge valve 2 is connected with guide shaft 3, and the guide shaft 3 is wrapped The spring 6 and the deluge valve 2 are provided with a flow controller 4 , the flow controller 4 is connected to the diaphragm chamber 1 , the diaphragm chamber 1 is connected to the pressure control valve 9 , and the pressure control valve 9 is connected to the solenoid valve 8 . In the servo state, the deluge valve 2 acts on the diaphragm chamber 1 by means of the water supply pressure, and the sealing surface of the diaphragm chamber 1 is tightly attached to the isolation layer in the valve body of the deluge valve 2, so that the deluge valve 2 is in a closed state . The guide shaft 3 is sealed and connected with the bonnet of the deluge valve 2 through the seal ring, which not only acts as a coaxial guide, but also cooperates with the spring 6 to make the seal more reliable; when working, it is connected in series to the pressure relief pipeline of the diaphragm chamber 1 The solenoid valve 8 is energized and opened, the pressure of the diaphragm chamber 1 is released, and the deluge valve 2 is opened to connect the water supply side B and the system side C, so that the fire pressure water can circulate, perform fire extinguishing, fire control, cooling and alarm; the flow controller 4 and the diaphragm The assembly is bolted to the inside of the deluge valve 2 valve body, and is used to control the outlet flow of the deluge valve 2, that is, to filter out the flow greater than the maximum protection area. It cooperates with the pressure control valve 9 to increase the working pressure stability of the deluge valve 2 (when the flow rate in the protection zone is greater than 2/3 of the rated flow rate of the deluge valve 2, the flow controller 4 does not need to be configured).

The lower end of the deluge valve 2 is provided with an automatic drain valve 5, and the automatic drain valve 5 is connected to the lower end of the system side C of the deluge valve 2 by threads, and it is used for removing a small amount of leakage water and judging whether the deluge valve is opened. It can drain water automatically under no water pressure, and can keep the seal under water pressure.

The diaphragm chamber 1 is connected in series with the manual emergency valve 7, and the manual emergency valve 7 is connected in series with the pressure relief pipeline of the diaphragm chamber 1, and is used to open the deluge valve device in an emergency.

Diaphragm cavity 1 is connected with reset ball valve 10, reset ball valve 10 is used to reset deluge valve 2, when the work is finished, solenoid valve 8 is reset, at this time, reset ball valve 10 is opened to fill diaphragm cavity 1 with water, when diaphragm cavity 1 and water supply When the side B pressure is equal, the deluge valve is closed, and finally the reset ball valve 10 is closed.

As shown in Figure 3, the pressure control valve 9 includes a valve body 12, the upper end of the valve body 12 is provided with an upper end cover 11, the lower end of the valve body 12 is provided with a lower end cover 15, the inside of the valve body 12 is provided with an inner chamber, and the upper part of the inner chamber is provided with a piston 13. The lower part of the inner cavity is provided with a limit sleeve 17, a valve body spring 14, and a bottom plate 18 in sequence from top to bottom. The two sides of the valve body 12 are respectively provided with an inlet 20 and an outlet 21. The waist of the piston 13 is provided with an annular groove 23, an annular groove 23 One end is connected to the inlet 20 , the other end is connected to the outlet 21 , a control port 22 is provided on one side of the valve body 12 , a pressure groove 19 is provided on the upper end cover 11 , and the control port 22 is connected to the pressure groove 19 . The control port 22 of the pressure control valve 9 is connected to the outlet of the deluge valve 2 in parallel. The outlet pressure of the deluge valve 2 is used as the feedback pressure of the pressure control valve 9, which is compared with the pre-pressure of the valve body spring 14 in the pressure control valve 9. Adjust the opening of the outlet 21 of the pressure control valve 9 to control the flow of the deluge valve 2, so as to achieve the purpose of constant output pressure.

When the manual emergency valve 7 or the solenoid valve 8 is opened, the pressure of the diaphragm chamber 1 drops, and after the deluge valve 2 is opened, the pressure control valve 9 has the following states:

a. When the outlet pressure of the deluge valve 2 is less than or equal to the design value, the thrust acting on the pressure groove 19 on the upper part of the piston 13 is compared with the pre-pressure of the valve body spring 14, and the thrust is smaller than the pre-pressure of the valve body spring 14, and the piston 13 does not operate, the inlet 20 and the outlet 21 are in a connected state; the deluge valve 2 continues to drain outward, the opening of the deluge valve 2 increases, and the outlet pressure of the deluge valve 2 rises;

b. When the outlet pressure of the deluge valve 2 increases and is greater than the design value, the upper thrust of the piston 13 is greater than the preload of the valve body spring 14, and the piston 13 moves downward, reducing the amount of water flowing from the inlet 20 to the outlet 21, and making the If it is less than the amount of water flowing from the restrictor orifice into the diaphragm chamber 1, the pressure of the diaphragm chamber 1 increases, the opening of the deluge valve 2 decreases, and the outlet pressure of the deluge valve 2 decreases accordingly; when the outlet pressure of the deluge valve 2 When it slowly decreases to the design value, the piston 13 stops moving, and the outlet pressure of the deluge valve 2 remains constant.

The limit sleeve 17 is sleeved on the outside of the valve body spring 14 , and the lower end of the limit sleeve 17 is provided with a leakage hole 24 for limiting the movement of the piston 13 .

The lower end cover 15 is provided with an adjusting screw assembly 16, the adjusting screw assembly 16 passes through the lower end cover 15 and is connected to the bottom plate 18, and the adjusting screw assembly 16 is screwed on the lower end cover 15, and its conical head rests on the conical shape of the lower end of the bottom plate 18. in the hole.

The area S2 of the annular groove 23 is equal to the area S1 of the inlet 20 and smaller than the area S3 of the outlet 21, and the width L2 of the annular groove 23 is larger than the width L3 of the outlet 21, and the width L3 of the outlet 21 is larger than the width L1 of the inlet 20.

In a word, the above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the patent of the present invention.

Claims (10)

1. Diaphragm constant pressure deluge alarm valve, including deluge valve (2), characterized in that: the deluge valve (2) is provided with a diaphragm chamber (1), and the diaphragm chamber (1) is connected in series with the pressure control valve (9) , the pressure control valve (9) is connected in parallel with the outlet of the deluge valve (2), and the pressure control valve (9) is connected in series with the solenoid valve (8). 2. The diaphragm type constant pressure deluge alarm valve according to claim 1, characterized in that: the pressure control valve (9) includes a valve body (12), the upper end of the valve body (12) is provided with an upper end cover (11), the valve The lower end of the body (12) is provided with a lower end cover (15), the inside of the valve body (12) is provided with a cavity, the upper part of the inner cavity is provided with a piston (13), and the lower part of the inner cavity is sequentially provided with a limit sleeve (17), Valve body spring (14), bottom plate (18). 3. The diaphragm type constant pressure deluge alarm valve according to claim 2, characterized in that: the valve body (12) is provided with an inlet (20) and an outlet (21) on both sides, and the piston (13) is provided with an annular groove (23), one end of the annular groove (23) is connected to the inlet (20), and the other end is connected to the outlet (21). 4. The diaphragm type constant pressure deluge alarm valve according to claim 2, characterized in that: a control port (22) is provided on one side of the valve body (12), and a pressure groove (19) is provided on the upper end cover (11) , the control port (22) is connected to the pressure groove (19). 5. The diaphragm type constant pressure deluge alarm valve according to claim 2, characterized in that: the limit sleeve (17) is set outside the valve body spring (14), and the lower end of the limit sleeve (17) is provided with a leakage hole ( twenty four). 6. The diaphragm type constant pressure deluge alarm valve according to claim 2, characterized in that: the lower end cover (15) is provided with an adjusting screw assembly (16), and the adjusting screw assembly (16) passes through the lower end cover (15) Connect with base plate (18). 7. The diaphragm type constant pressure deluge alarm valve according to claim 3, characterized in that: the area of the annular groove (23) is equal to the area of the inlet (20), smaller than the area of the outlet (21), and the area of the annular groove (23) ) width is greater than the width of the outlet (21), and the width of the outlet (21) is greater than the width of the inlet (20). 8. The diaphragm type constant pressure deluge alarm valve according to claim 1, characterized in that: the lower end of the deluge valve (2) is provided with an automatic drain valve (5), and the top surface of the deluge valve (2) is connected to the guide shaft ( 3), the guide shaft (3) wraps the spring (6) outside. 9. The diaphragm type constant pressure deluge alarm valve according to claim 1, characterized in that: the diaphragm chamber (1) is connected in series with the manual emergency valve (7), and the diaphragm chamber (1) is connected with the reset ball valve (10). 10. The diaphragm type constant pressure deluge alarm valve according to claim 1, characterized in that: the deluge valve (2) is provided with a flow controller (4), and the flow controller (4) is connected to the diaphragm chamber (1) .