Water flow indicator with time delay function

Abstract

The water flow indicator with the time delay function comprises a signal device, a trigger structure and a time delay device, the trigger structure comprises a bottom plate, a swing rod arranged on the bottom plate in a penetrating mode and a blade connected to the lower end of the swing rod, the time delay device and the signal device are arranged at the upper end of the bottom plate, and the time delay device comprises a left cover and a right cover which are buckled together. An elastic membrane is arranged between the left cover and the right cover and divides the space defined by the left cover and the right cover into a left cavity and a right cavity, small exhaust holes are formed in the left cover, an ejector rod is arranged in the right cover in a penetrating mode, one end of the ejector rod is connected with the elastic membrane, the other end of the ejector rod is matched with a signal device, and the middle of the ejector rod is hinged to the upper end of a swing rod. An annular limiting wall is arranged in the right cover, and the middle of the elastic membrane protrudes towards the right side and abuts against the limiting wall. The water flow indicator with the time delay function is simple in structure, and the reaction speed of the water flow indicator is guaranteed while the time delay function is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of water flow indicators, in particular to a water flow indicator with a time-delay function. Background Art

[0002] The water flow indicator is an important component of the automatic sprinkler fire extinguishing system. It is generally installed on the main pipe or branch pipe of the system side pipe network. When the blade detects the water flow signal, it converts the water flow signal into an electrical signal, conducts with the electrical switch to start the electrical alarm system or directly start electrical equipment such as fire pumps, and can display the fire occurrence area. At the same time, in order to overcome the phenomenon that the water flow indicator is triggered to generate an electrical signal due to the turbulence of the water inside the system pipeline or the air surge, resulting in false alarms of the system, people have also developed a water flow indicator with a time-delay function. The existing water flow indicator with a time-delay function usually sets an air chamber as the time-delay component. A diaphragm is provided in the air chamber. By connecting the push rod of the water flow indicator with the diaphragm, when the paddle of the water flow indicator drives the push rod to move, the diaphragm pushes the air in the air chamber to discharge it. When a certain amount of air is discharged, the push rod will trigger the switch. When the paddle swings instantaneously, the amount of air discharged in the air chamber is insufficient, and the push rod will not trigger the switch. At this time, the push rod needs to be reset. The prior art usually drives the push rod to reset by setting a reset spring. The existence of the reset spring reduces the sensitivity of the water flow indicator, makes its response slower, and makes the structure of the water flow indicator more complex. Summary of the Utility Model

[0003] To overcome the technical defects existing in the prior art, the utility model provides a water flow indicator with a time-delay function, which has a simple structure and ensures the response speed of the water flow indicator while ensuring the time-delay function.

[0004] The technical solution adopted by the utility model is: a water flow indicator with a time-delay function, including a signal device, a trigger structure and a time-delay device. The trigger structure includes a bottom plate, a swing rod passing through the bottom plate and a paddle connected to the lower end of the swing rod. The time-delay device and the signal device are arranged at the upper end of the bottom plate. The time-delay device includes a left cover and a right cover buckled together. An elastic diaphragm is arranged between the left cover and the right cover. The elastic diaphragm divides the space enclosed by the left cover and the right cover into a left chamber and a right chamber. An exhaust hole is opened on the left cover. A push rod is arranged in the right cover. One end of the push rod is connected with the elastic diaphragm, and the other end of the push rod cooperates with the signal device. The middle part of the push rod and the upper end of the swing rod are hinged. An annular limiting wall is arranged in the right cover. The outer edge of the elastic diaphragm is clamped between the left cover and the right cover. The middle part of the elastic diaphragm bulges to the right and abuts against the limiting wall.

[0005] Preferably, two microswitches are provided inside the signal device, and two trigger heads cooperating with the microswitches are provided on the ejector rod.

[0006] Preferably, a regulating disk is rotatably fitted at the left end of the left cover. An arc-shaped exhaust path extending around the axis of the left cover is formed in the regulating disk. The arc-shaped exhaust path communicates with the exhaust orifice, and an exhaust port communicating with the arc-shaped exhaust path is formed at the outer edge of the regulating disk.

[0007] Preferably, a U-shaped screw rod is provided at the bottom of the bottom plate, and the blade is placed inside the U-shaped screw rod.

[0008] Preferably, a saddle is fixedly connected to the bottom of the bottom plate. Two ends of the U-shaped screw rod are connected to the saddle. An installation hole penetrating up and down is formed in the saddle, and the swing rod is inserted into the installation hole.

[0009] Preferably, a protective cover is provided to cover the top of the bottom plate, and the signal device and the delay device are both arranged inside the protective cover.

[0010] The beneficial effects of the present utility model are as follows: The water flow indicator with a delay function of the present utility model adopts an elastic diaphragm. An annular limiting wall is provided inside the right cover. The middle part of the elastic diaphragm bulges to the right and abuts against the limiting wall. When the ejector rod pushes the elastic diaphragm, the left air cavity is compressed, the elastic diaphragm deforms and disengages from the limiting wall. When the ejector rod resets, the elastic diaphragm resumes deformation and pushes the ejector rod to reset. The elastic diaphragm abuts against the limiting wall again. The ejector rod does not swing left and right during reset. Compared with using a reset spring, the reset structure of the present utility model is simpler, the resistance to the swing of the ejector rod is weakened, and the stability of the ejector rod can be maintained. Description of the Drawings

[0011] Figure 1 is a schematic structural view of the water flow indicator with a delay function of the present utility model.

[0012] Figure 2 is a top view of the water flow indicator with a delay function of the present utility model.

[0013] Description of the reference numerals: 1, bottom plate; 2, protective cover; 3, saddle; 4, U-shaped screw rod; 5, blade; 6, swing rod; 7, ejector rod; 8, signal device; 801, microswitch; 9, delay device; 901, left cover; 9011, exhaust orifice; 902, right cover; 903, elastic diaphragm; 904, limiting wall; 905, regulating disk; 9051, exhaust path; 9052, exhaust port. Detailed Embodiment

[0014] The present utility model will be further described below with reference to the drawings:

[0015] AsFigure 1 and Figure 2 As shown, this embodiment provides a water flow indicator with a time delay function, which includes a signal device 8, a trigger structure, and a time delay device 9. The trigger structure includes a bottom plate 1, a swing rod 6 passing through the bottom plate 1, and a paddle 5 connected to the lower end of the swing rod 6. The time delay device 9 and the signal device 8 are arranged at the upper end of the bottom plate 1. The time delay device 9 includes a left cover 901 and a right cover 902 that are buckled together. An elastic diaphragm 903 is arranged between the left cover 901 and the right cover 902. The elastic diaphragm 903 divides the space enclosed by the left cover 901 and the right cover 902 into a left chamber and a right chamber. An exhaust small hole 9011 is opened on the left cover 901. A push rod 7 passes through the right cover 902. One end of the push rod 7 is connected to the elastic diaphragm 903, and the other end of the push rod 7 cooperates with the signal device 8. The middle of the push rod 7 is hinged to the upper end of the swing rod 6. An annular limiting wall 904 is arranged in the right cover 902. The outer edge of the elastic diaphragm 903 is clamped between the left cover 901 and the right cover 902. The middle of the elastic diaphragm 903 bulges to the right and abuts against the limiting wall 904.

[0016] Two micro switches 801 are arranged in the signal device 8 of this embodiment. Two trigger heads cooperating with the micro switches 801 are arranged on the push rod 7. The two micro switches 801 can trigger two groups of feedback signals, improving the safety of the indicator.

[0017] A regulating disk 905 is rotatably fitted at the left end of the left cover 901 of this embodiment. An arc-shaped exhaust path 9051 extending around the axis of the left cover 901 is opened on the regulating disk 905. The arc-shaped exhaust path 9051 is communicated with the exhaust small hole 9011. An exhaust port 9052 communicated with the arc-shaped exhaust path 9051 is opened at the outer edge of the regulating disk 905. By rotating the regulating disk 905 to adjust the length of the arc-shaped exhaust path 9051 between the exhaust port 9052 and the exhaust small hole, the length of the exhaust path changes, and the exhaust time of the left air chamber also changes accordingly, thereby changing the time delay.

[0018] In this embodiment, a U-shaped screw rod 4 is provided at the bottom of the bottom plate 1. The paddle 5 is placed inside the U-shaped screw rod 4. A saddle 3 is fixedly connected to the bottom of the bottom plate 1. Both ends of the U-shaped screw rod 4 are connected to the saddle 3. An installation hole penetrating up and down is provided on the saddle 3. The swing rod 6 is inserted into the installation hole. When the water flow indicator with a time-delay function in this embodiment is in use, the pipeline is inserted into the U-shaped screw rod 4, and the paddle 5 extends into the pipeline. When the water in the pipeline flows, the paddle 5 can be pushed. The paddle 5 drives the swing rod 6 to swing. The swing rod 6 pushes the ejector rod 7. The ejector rod 7 pushes the elastic diaphragm 903. The air in the left air chamber is compressed, and the air gradually discharges through the exhaust port 9052. When a certain amount of air is discharged, the ejector rod 7 triggers the microswitch 801 to issue an alarm. Preferably, a protective cover 2 is provided to cover the top of the bottom plate 1. The signal device 8 and the time-delay device 9 are both arranged inside the protective cover 2.

[0019] The water flow indicator with a time-delay function in this embodiment adopts an elastic diaphragm 903. An annular limiting wall 904 is provided inside the right cover 902. The middle part of the elastic diaphragm 903 bulges to the right and abuts against the limiting wall 904. When the ejector rod 7 pushes the elastic diaphragm 903, the left air chamber is compressed. The elastic diaphragm 903 deforms and disengages from the limiting wall 904. When the ejector rod 7 resets, the elastic diaphragm 903 restores its deformation and pushes the ejector rod 7 to reset. The elastic diaphragm 903 abuts against the limiting wall 904 again. The ejector rod 7 does not swing left and right during reset. Compared with using a reset spring, the reset structure in this embodiment is simpler, reduces the resistance of the ejector rod 7 to swing, and can maintain the stability of the ejector rod 7.

[0020] The above shows and describes the basic principles, main features of the present invention and the advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present utility model. Without departing from the spirit and scope of the present invention, the present utility model will have various changes and improvements. These changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A water flow indicator with a time delay function, characterized in that: It includes a signal device, a trigger structure and a delay device. The trigger structure includes a bottom plate, a swing rod passing through the bottom plate, and a paddle connected to the lower end of the swing rod. The delay device and the signal device are arranged at the upper end of the bottom plate. The delay device includes a left cover and a right cover buckled together. An elastic diaphragm is arranged between the left cover and the right cover. The elastic diaphragm divides the space enclosed by the left cover and the right cover into a left chamber and a right chamber. An exhaust small hole is opened on the left cover. A push rod passes through the right cover. One end of the push rod is connected to the elastic diaphragm, and the other end of the push rod cooperates with the signal device. The middle of the push rod is hinged to the upper end of the swing rod. An annular limiting wall is arranged in the right cover. The outer edge of the elastic diaphragm is clamped between the left cover and the right cover. The middle of the elastic diaphragm bulges to the right and abuts against the limiting wall.

2. The water flow indicator with a time delay function according to claim 1, characterized in that: Two microswitches are arranged in the signal device, and two trigger heads cooperating with the microswitches are arranged on the push rod.

3. The water flow indicator with a time delay function according to claim 1, characterized in that: A regulating disc is rotatably fitted at the left end of the left cover. An arc-shaped exhaust path extending around the axis of the left cover is opened on the regulating disc. The arc-shaped exhaust path is communicated with the exhaust small hole. An exhaust port communicated with the arc-shaped exhaust path is opened on the outer edge of the regulating disc.

4. The water flow indicator with a time delay function according to claim 1, wherein: A U-shaped screw rod is arranged at the bottom of the bottom plate, and the paddle is placed in the U-shaped screw rod.

5. The water flow indicator with a time delay function according to claim 4, characterized in that: A saddle is fixedly connected to the bottom of the bottom plate. The two ends of the U-shaped screw rod are connected to the saddle. An installation hole penetrating up and down is opened on the saddle, and the swing rod passes through the installation hole.

6. The water flow indicator with a time delay function according to claim 1, characterized in that: A protective cover covers the top of the bottom plate, and the signal device and the delay device are both arranged in the protective cover.

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