Volume-variable pressure relief water meter

Abstract

The utility model belongs to the technical field of water meters, and particularly relates to a volume-variable pressure relief water meter. A water inlet and a water outlet of a meter shell are respectively provided with a switch valve, a pressure relief device penetrates through the lower end of the meter shell and comprises a pressure relief pipe, a containing cavity used for temporarily storing water is formed in the pressure relief pipe, and a movable piston is further arranged on the inner side of the pressure relief pipe and can divide the containing cavity of the pressure relief pipe into an upper cavity and a lower cavity. The upper cavity is communicated with the interior of the watchcase; the moving piston is provided with a moving device capable of driving the moving piston to move up and down, and the up-and-down volume of the containing cavity can be changed through up-and-down movement of the moving piston; the volume of the upper cavity of the pressure relief pipe can be increased through downward movement of the movable piston, so that the volume of a closed space formed by the water meter and the switch valves at the two ends of the water meter is increased, the internal pressure is reduced, the pressure relief function is achieved, the acting force of water pressure on the pipe joint is reduced, the pipe joint is convenient to disassemble, and the working efficiency of water meter replacement is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to water gauge technical field, especially relate to a variable volume pressure relief water gauge. BACKGROUND

[0002] At present, most of the water gauges used by residents are installed outdoors, and most of the resident water gauges are installed outdoors, such as being installed in the pipeline interval or pipeline well of the corridor, which is convenient for property or water supply department to copy meter and maintain, and can also ensure the safety and tidiness of the water gauge. As we all know, the tap water pipe has a certain pressure, and the pipe joint is very difficult to disassemble under the action of the pressure. Therefore, when the water gauge needs to be maintained or replaced, the corresponding user needs to open the indoor faucet to release the pressure in the water pipe. Sometimes the disassembly operation is arranged on weekdays, and there is no one at home, so it is necessary to coordinate the opening of the door to release water, which affects the efficiency of the disassembly operation.

[0003] In view of the above problems, it is particularly important to design a water gauge with pressure relief function. CONTENT OF THE UTILITY MODEL

[0004] The technical problem to be solved by the utility model is to set a pressure relief device on the water gauge, so that the internal volume of the water gauge is variable, the function of pressure relief is realized, and the disassembly efficiency of the water gauge is improved.

[0005] In order to solve the above technical problems, the utility model provides a variable volume pressure relief water gauge, which comprises a watch case, a switch valve is arranged at the water inlet and water outlet of the watch case, a pressure relief device is arranged at the lower end of the watch case, the pressure relief device comprises a pressure relief pipe, a cavity for temporarily storing water is arranged in the pressure relief pipe, a movable piston capable of sliding up and down is further arranged in the pressure relief pipe, the movable piston can divide the cavity of the pressure relief pipe into an upper cavity and a lower cavity, and the upper cavity is communicated with the inside of the watch case; a sealing ring for sealing is arranged around the movable piston, and the sealing ring is arranged between the movable piston and the inner wall of the cavity of the pressure relief pipe; the movable piston is provided with a moving device capable of driving it to move up and down, the downward movement of the movable piston can change the capacity of the upper cavity of the pressure relief pipe, and the lower side of the pressure relief pipe is provided with a vent hole for discharging air inside.

[0006] When the water meter needs to be repaired or replaced, the valves at both ends of the water meter are closed first, the adjusting ring is rotated to drive the pull rod to move the moving piston downward, with the downward movement of the moving piston, the volume of the upper cavity of the pressure relief pipe is increased, because the upper cavity of the pressure relief pipe is communicated with the water meter, the water in the water meter can enter the cavity of the pressure relief pipe under the action of water pressure, by increasing the volume of the upper cavity of the pressure relief pipe, the volume of the closed space composed of the water meter and the two end switch valves is increased, so that the water with a fixed volume in the water meter obtains a larger storage volume, at this time, the water pressure in the water meter is reduced, the function of pressure relief is realized, the force of the water pressure on the pipe joint is reduced, the water meter is convenient to disassemble from the valve connection at both ends, the replacement of the water meter is completed.

[0007] Preferably, the moving device comprises a pull rod capable of pulling the moving piston to move up and down, one end of the pull rod is fixedly connected with the moving piston, the other end of the pull rod extends to the outside of the pressure relief pipe and is threadedly connected with an adjusting ring, the adjusting ring is arranged at the lower end of the pressure relief pipe and can rotate relative to the pressure relief pipe, the lower end of the pressure relief pipe is further provided with a baffle limiting the upward and downward movement of the adjusting ring, the baffle is provided with stepped holes with diameters decreasing from top to bottom, a limiting plate capable of being connected with the adjusting ring is sleeved in the large hole with a large diameter at the upper end of the baffle, the limiting plate can rotate relative to the baffle, the upper end of the adjusting ring is connected with the limiting plate, and the lower end of the adjusting ring extends to the outside of the baffle through the small hole with a small diameter at the baffle.

[0008] Preferably, the cross section of the pull rod is in a polygonal structure, and the pressure relief pipe is provided with a polygonal hole matched with the pull rod.

[0009] Preferably, the moving device comprises a pull rod capable of pulling the moving piston to move up and down, one end of the pull rod is fixedly connected with the moving piston, the other end of the pull rod extends to the outside of the pressure relief pipe and is threadedly connected with an adjusting ring, the adjusting ring is arranged at the lower end of the pressure relief pipe and can rotate relative to the pressure relief pipe, the lower end of the pressure relief pipe is further provided with a baffle limiting the upward and downward movement of the adjusting ring, the baffle is provided with stepped holes with diameters decreasing from top to bottom, a limiting plate capable of being connected with the adjusting ring is sleeved in the large hole with a large diameter at the upper end of the baffle, the limiting plate can rotate relative to the baffle, the upper end of the adjusting ring is connected with the limiting plate, and the lower end of the adjusting ring extends to the outside of the baffle through the small hole with a small diameter at the baffle.

[0010] In summary, the utility model can increase the volume of the closed space composed of the water meter and the two end valves by the downward movement of the moving piston, thereby reducing the water pressure in the water meter, realizing the pressure relief function, reducing the force of the water pressure on the pipe joint, facilitating the disassembly of the water meter and improving the work efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0011] The application will be further described in detail below in combination with the drawings and specific embodiments:

[0012] Figure 1The utility model discloses a structure schematic view of the utility model;

[0013] Figure 2 The utility model discloses an internal structure schematic view of the utility model;

[0014] Figure 3 The utility model discloses an internal structure main view schematic view of the utility model;

[0015] Figure 4 It is the partial close -up drawing of A place;

[0016] Figure 5 It is the partial close -up drawing of B place;

[0017] Figure 6 It is the schematic diagram of the section shape of pull rod;

[0018] Figure 7 It is the schematic diagram of the structure of another embodiment of mobile device;

[0019] Figure 8 It is the partial close -up drawing of C place.

[0020] In the drawing: 1 - watchcase, 2 - pressure relief pipe, 201 - mobile piston, 202 - pull rod, 203 - adjusting ring, 204 - baffle, 205 - limit plate, 206 - snap ring, 207 - sleeve, 3 - air vent. DETAILED DESCRIPTION

[0021] Referring to the accompanying Figure 1 and the accompanying Figure 2 , the utility model provides a variable volume pressure relief water meter, including watchcase 1, the left and right sides of watchcase 1 are equipped with water inlet and water outlet respectively, and water inlet and water outlet are equipped with switch valve respectively, and two switch valves are close to watchcase 1 and are arranged, and the lower end of watchcase 1 is penetrated with pressure relief device, and the pressure relief device includes pressure relief pipe 2, and the inside of pressure relief pipe 2 is equipped with the cavity for temporarily storing water, and the inside of pressure relief pipe 2 is also equipped with mobile piston 201 that can slide up and down, and mobile piston 201 can divide the internal cavity of pressure relief pipe 2 into upper chamber and lower chamber, and the upper chamber is penetrated with the inside of watchcase 1, and the water in water meter can enter into the upper chamber, and the lower chamber is penetrated with the outside, and mobile piston 201 is equipped with mobile device that can drive it to move up and down, and mobile piston 201 can change the capacity of the upper chamber in pressure relief pipe 2 when moving downwards, and the downside of pressure relief pipe 2 is equipped with air vent 3 for removing the air in the inside, and air vent 3 penetrates the lower chamber of pressure relief pipe 2, and air vent 3 is used to balance the pressure difference between the inside and the outside of pressure relief pipe 2, and when mobile piston 201 moves downwards, the air in the lower chamber of pressure relief pipe 2 can be discharged through air vent 3.

[0022] Mobile piston 201 is ringed with sealing ring for sealing, and the sealing ring is arranged between the inner wall of the cavity of pressure relief pipe 2 and mobile piston 201.

[0023] Referring to Figure 3 , Figure 4 and Figure 5 , the mobile device comprises a pull rod 202 capable of pulling the mobile piston 201 to move up and down, one end of the pull rod 202 is fixedly connected with the mobile piston 201, the other end of the pull rod 202 extends downward to the outside of the pressure relief pipe 2 and is threadedly connected with an adjusting ring 203, the adjusting ring 203 is arranged at the lower end of the pressure relief pipe 2 and can rotate relative to the pressure relief pipe 2, the lower end of the pressure relief pipe 2 is further provided with a baffle plate 204 for limiting the adjusting ring 203 to move up and down, the baffle plate 204 is provided with stepped holes with diameters decreasing from top to bottom, a large hole with a larger diameter at the upper end of the baffle plate 204 is sleeved with a limiting plate 205 capable of being connected with the adjusting ring 203, the limiting plate 205 can rotate relative to the baffle plate 204, the upper end of the adjusting ring 203 is connected with the limiting plate 205, and the lower end of the adjusting ring 203 passes through a small hole with a smaller diameter on the baffle plate 204 and extends to the outside of the baffle plate 204; the baffle plate 204 limits the limiting plate 205 in the large hole of the stepped hole, the limiting plate 205 can only rotate relative to the baffle plate 204 and cannot move up and down, and the function that the adjusting ring 203 can rotate relative to the baffle plate 204 but cannot move up and down is realized by connecting the limiting plate 205 with the adjusting ring 203.

[0024] Referring to Figure 6 , the cross section of the pull rod 202 is in a polygonal structure, and the pressure relief pipe 2 is provided with a polygonal hole matched with the pull rod 202, so as to ensure that the pull rod 202 can only move up and down along the pressure relief pipe 2. Those skilled in the art can also ensure that the pull rod 202 and the pressure relief pipe 2 can move up and down while being unable to rotate relative to each other by setting a key connection between the pull rod 202 and the pressure relief pipe 2.

[0025] The utility model discloses a water meter through above structure, water meter normal work, mobile piston 201 is in the upper end position, because pull rod 202 is connected with the adjusting ring 203 thread, and the adjusting ring 203 can only rotate under the restriction of baffle 204 and cannot move up and down, therefore when normal water supply in water meter, even if mobile piston 201 bears certain water pressure can keep its in the upper end position. When water meter needs to overhaul or replace, first close the valve at both ends of water meter, rotate adjusting ring 203 and make pull rod 202 drive mobile piston 201 to move down, along with the downward movement of mobile piston 201, the upper cavity volume of pressure relief pipe 2 container chamber becomes big, because the upper cavity of pressure relief pipe 2 is communicated with water meter, the water in water meter can enter the upper cavity of pressure relief pipe 2 under the action of water pressure, by increasing the volume of pressure relief pipe 2 upper cavity, increase the volume of the closed space that is composed of water meter and both end switch valve, make the water of fixed capacity in water meter obtain larger storage volume, the water pressure in water meter reduces, realize the function of pressure relief. After the internal pressure of water meter reduces, the force of water pressure to pipe joint reduces, and the water meter is removed from the valve connection at both ends, and the replacement work of water meter is completed. Because the water meter for current resident does not have the water storage function, only a small amount of water is in the water meter, therefore by changing the volume of the upper cavity of pressure relief pipe 2 can reduce the water pressure in water meter, realize the function of pressure relief, and simultaneously, because pressure relief pipe 2 has certain volume, can temporarily store certain capacity of water, when pressure relief to water meter, do not need to discharge water, after the water meter is disassembled, the water is collected with container, and the phenomenon that water is splashed in construction site is reduced.

[0026] Another embodiment of the mobile device, see Figure 7 and Figure 8 , the mobile device includes the pull rod 202 that can pull the mobile piston 201 to move up and down, one end of pull rod 202 is rotationally connected with mobile piston 201, the other end of pull rod 202 is threadedly connected with pressure relief pipe 2 and extends to the outside of pressure relief pipe 2;The lower end of mobile piston 201 is fixedly provided with a hollow sleeve 207, a clasp 206 that can rotate is sleeved on the inner side of sleeve 207, one end of clasp 206 is fixedly connected with pull rod 202, the other end of pull rod 202 extends to the outside of pressure relief pipe 2 through sleeve 207, clasp 206 can rotate relative to sleeve 207, realize the rotation of clasp 206 relative to mobile piston 201, so that pull rod 202 fixedly connected with clasp 206 can rotate relative to mobile piston 201. Those skilled in the art can set the clamping groove for tool clamping on the lower end of pull rod 202, so as to facilitate the rotation of pull rod 202. Through the above structure, when the water meter needs to be disassembled, rotate pull rod 202, because pull rod 202 is threadedly connected with pressure relief pipe 2, therefore, pull rod 202 can move down while rotating, thereby driving mobile piston 201 to move down, change the volume of the upper cavity of pressure relief pipe 2, make the water in water meter obtain larger storage space, reduce internal pressure, realize the function of pressure relief, facilitate the disassembly or replacement work of water meter.

[0027] The utility model discloses a water meter shell sets up and its through pressure relief device, the downward movement of mobile piston in pressure relief device can increase the volume of upper chamber of pressure relief pipe, thereby increases the volume of the closed space that water meter and switch valve door of both ends constitute, when the volume increases, its internal pressure reduces, thereby realized the function of pressure relief, reduced the force of water pressure to pipe joint, convenient to the pipe joint is dismantled to realize the overhaul or replacement work of water meter, improved the work efficiency of water meter replacement.

[0028] Of course, the above description is not a limitation of the utility model, and the utility model is not limited to the above examples. Changes, modifications, additions or replacements made by the skilled in the art within the essential scope of the utility model should also be within the protection scope of the utility model.

Claims

1. A variable volume pressure relief water meter comprising a meter housing, characterized by, The water inlet and outlet of the watch case are respectively provided with switch valves, the lower end of the watch case is penetrated by a pressure relief device, the pressure relief device comprises a pressure relief pipe, a cavity for temporarily storing water is arranged in the pressure relief pipe, a movable piston capable of sliding up and down is further arranged in the pressure relief pipe, the movable piston can divide the cavity of the pressure relief pipe into an upper cavity and a lower cavity, and the upper cavity is communicated with the inside of the watch case; a sealing ring for sealing is arranged around the movable piston, and the sealing ring is arranged between the movable piston and the inner wall of the cavity of the pressure relief pipe; The movable piston is provided with a moving device capable of driving the movable piston to move up and down, and downward movement of the movable piston can change the capacity of the upper cavity of the pressure relief pipe, and the lower side of the pressure relief pipe is provided with a vent hole for discharging air inside.

2. A variable volume pressure relief water meter as claimed in claim 1 wherein, The moving device comprises a pull rod capable of pulling the movable piston to move up and down, one end of the pull rod is fixedly connected with the movable piston, the other end of the pull rod extends downward to the outside of the pressure relief pipe and is threadedly connected with an adjusting ring, the adjusting ring is arranged at the lower end of the pressure relief pipe and can rotate relative to the pressure relief pipe, the lower end of the pressure relief pipe is further provided with a baffle limiting the upward and downward movement of the adjusting ring, the baffle is provided with stepped holes with diameters decreasing from top to bottom, a limiting plate capable of being connected with the adjusting ring is sleeved in the large hole with a large diameter at the upper end of the baffle, the limiting plate can rotate relative to the baffle, the upper end of the adjusting ring is connected with the limiting plate, and the lower end of the adjusting ring passes through the small hole with a small diameter at the baffle and extends to the outside of the baffle.

3. A variable volume pressure relief water meter as claimed in claim 2 wherein, The cross section of the pull rod is in a polygonal structure, and the pressure relief pipe is provided with a polygonal hole matched with the pull rod.

4. A variable volume pressure relief water meter as defined in claim 1 wherein, The moving device comprises a pull rod capable of pulling the movable piston to move up and down, one end of the pull rod is rotatably connected with the movable piston, the other end of the pull rod is threadedly connected with the pressure relief pipe and extends to the outside of the pressure relief pipe; the lower end of the movable piston is fixedly provided with a hollow clamping sleeve, a clamping ring capable of rotating is sleeved in the inside of the clamping sleeve, one end of the pull rod is fixedly connected with the clamping ring, and the other end of the pull rod extends downward to the outside of the pressure relief pipe through the clamping sleeve.

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