Anti-freezing water meter pressure release valve

Abstract

The utility model relates to a pressure release valve of an anti-freezing water meter. The pressure release valve comprises a release shaft, a valve body and a piston assembly, the discharge shaft is inserted from the right end of the valve body to the left end in the cavity of the valve body; the left side of the discharge shaft is sleeved with a reset spring; the left end of the discharge shaft is in threaded connection with a limiting nut; the piston assembly is assembled into the cavity of the valve body from the right end of the valve body, the left end abuts against the inner end face of the valve body, and the right end extends out of the valve body. A pressure spring and a nut are sequentially sleeved on the piston assembly; the nut is screwed at the right end in the cavity of the valve body; the right end of the piston assembly is connected with a movable plastic shell cover in a screwed mode. And the valve body is screwed in a water meter through threads. Compared with the prior art, the pressure relief device has the advantages of stable pressure relief period, capability of preventing the water meter from being frozen and the like.

Description

Technical Field

[0001] This utility model relates to the field of water meter antifreeze and pressure relief technology, and in particular to an antifreeze water meter pressure relief valve. Background Technology

[0002] In southern my country, water meters are typically installed outdoors. During extreme cold snaps in winter, the water entering the meter can freeze due to the temperature drop, increasing its volume and internal pressure, often leading to damage. Maintaining or replacing damaged water meters in cold, rainy, or snowy weather is extremely difficult, and prolonged water outages cause significant inconvenience to residents. Therefore, many water meter manufacturers are researching and designing various anti-freezing structures to reduce economic losses caused by freezing and minimize the impact on residents' daily water supply.

[0003] Chinese patent CN201811022628.6 discloses an antifreeze water meter with a venting mechanism including a venting pipe, a guide pipe, a piston, a spring, and a pressure ring. When internal freezing causes excessive pressure, the water pressure overcomes the spring force, causing the piston to move outward, and water flows from the guide pipe into the venting pipe and is discharged. However, since water has very low compressibility (liquids are generally considered incompressible), after the water pressure forces the piston open and leaks outside the meter, the internal water pressure drops, and the spring pushes the piston back to a sealed state. Because the amount of water discharged each time is very small, the piston remains in a critical state of sealing and venting for a long time, repeatedly vibrating within this range, causing wear on the sealing components and reducing the product's lifespan. Utility Model Content

[0004] The purpose of this utility model is to overcome the defects of the existing technology and provide an antifreeze water meter pressure relief valve.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A pressure relief valve for an antifreeze water meter includes a relief shaft, a valve body, and a piston assembly. The relief shaft is inserted from the right end of the valve body and assembled into the left end of the valve body cavity. A return spring is fitted on the left side of the relief shaft. A limit nut is threaded onto the left end of the relief shaft. The piston assembly is assembled from the right end of the valve body into the valve body cavity, with its left end abutting against the inner end face of the valve body and its right end extending out of the valve body. A compression spring and a nut are sequentially fitted onto the piston assembly. The nut is screwed onto the right end of the valve body cavity. A movable plastic shell is screwed onto the right end of the piston assembly. The valve body is threaded into a water meter.

[0007] Furthermore, the piston assembly includes a sealing sleeve and a piston; the sealing sleeve is threaded onto the left end of the piston; a sealing gasket is provided between the sealing sleeve and the piston; and two O-rings are also provided on the piston.

[0008] Furthermore, the piston is a hollow piston; the sealing sleeve is a sealing sleeve with a water inlet hole; the movable plastic shell is a shell with a drain outlet; and the drain outlet is located on the side of the movable plastic shell.

[0009] Furthermore, a limiting protrusion is provided on the venting shaft; the limiting protrusion is an annular protrusion with a size larger than the left end outlet of the valve body; the venting shaft is inserted from the water inlet hole of the sealing sleeve, and the limiting protrusion abuts against and squeezes the sealing gasket.

[0010] Furthermore, a waterproof sealing ring is provided between the valve body and the water meter.

[0011] Furthermore, the water meter includes a water meter housing and a meter cover; the meter cover covers the water meter housing; tempered glass is disposed between the water meter housing and the meter cover; an organic core is disposed inside the water meter housing; and the valve body is threadedly screwed into the water meter housing.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] This invention utilizes the combined use of a venting shaft and a piston assembly to discharge excess water from the water meter when the internal water pressure increases due to freezing, thereby balancing the internal pressure and preventing the water meter from freezing. Compared to venting mechanisms that use only a single piston, this invention offers a more stable pressure relief cycle, preventing the piston assembly from constantly being in a critical state of sealing and venting, resulting in less wear and a longer service life. Attached Figure Description

[0014] Figure 1 This is an exploded view of the pressure relief valve structure provided by this utility model;

[0015] Figure 2 This is a schematic diagram of the pressure relief valve structure assembly provided by this utility model;

[0016] Figure 3 A schematic diagram of the pressure relief valve provided by this utility model assembled into a water meter.

[0017] The labels in the diagram indicate:

[0018] 1. Limit nut; 2. Return spring; 3. Discharge shaft; 4. Valve body; 5. Sealing sleeve; 6. Sealing gasket; 7. O-ring seal; 8. Piston; 9. Compression spring; 10. Nut; 11. Movable plastic shell cover; 12. Water meter; 13. Limit protrusion; 14. Waterproof sealing ring; 15. Water meter housing; 16. Meter cover; 17. Tempered glass; 18. Mechanism. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0024] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] Example

[0026] like Figures 1-3 As shown, an antifreeze water meter pressure relief valve is threaded into a water meter 12. The water meter 12 includes a water meter housing 15 and a meter cover 16. The meter cover 16 covers the water meter housing 15. A tempered glass 17 is disposed between the water meter housing 15 and the meter cover 16. An organic core 18 is disposed inside the water meter housing 15. The pressure relief valve includes a relief shaft 3, a valve body 4, and a piston assembly. The relief shaft 3 is inserted from the right end of the valve body 4 and assembled into the left end of the valve body 4 cavity. A return spring 2 is sleeved on the left side of the relief shaft 3. A limiting nut 1 is threaded onto the left end of the vent shaft 3 to limit the left end of the vent shaft 3; a limiting protrusion 13 is provided on the vent shaft 3; the limiting protrusion 13 is an annular protrusion larger than the left end outlet of the valve body 4, used to limit the right end of the vent shaft 3; the piston assembly is assembled into the cavity of the valve body 4 from the right end, with its left end abutting against the inner end face of the valve body 4 and its right end extending out of the valve body 4; a compression spring 9 and a nut 10 are sequentially fitted onto the piston assembly; the nut 10 is screwed onto the right end of the cavity of the valve body 4; a movable plastic shell cover 11 is screwed onto the right end of the piston assembly; the valve body 4 The valve body 4 is threaded into the water meter housing 15 of the water meter 12; a waterproof sealing ring 14 is provided between the valve body 4 and the water meter 12; the waterproof sealing ring 14 is located between the valve body 4 and the water meter housing 15 to prevent water leakage; the piston assembly includes a sealing sleeve 5 and a piston 8; the sealing sleeve 5 is threaded into the left end of the piston 8; a sealing gasket 6 is provided between the sealing sleeve 5 and the piston 8; the sealing sleeve 5 is a sealing sleeve with a water inlet hole; the discharge shaft 3 is inserted from the water inlet hole of the sealing sleeve 5, and the limiting protrusion 13 abuts against and squeezes the sealing gasket 6; the piston 8 is also provided with Two O-rings 7 are used to tightly fit the side wall of the cavity inside the valve body 4 to seal the water inside the water meter and prevent leakage from the side wall; the piston 8 is a hollow piston; the movable plastic shell cover 11 is a shell cover with a drain port; the drain port is located on the side of the movable plastic shell cover 11. Under normal circumstances, the drain port is sealed inside the water meter housing 15. When the movable plastic shell cover 11 is pushed out, the drain port is exposed, and water flows into the piston 8 from the left end through the water inlet hole of the sealing sleeve 5, and flows out from the piston 8 from the right end, and then flows out of the water meter through the drain port of the movable plastic shell cover 11.

[0027] The working principle of this utility model is as follows:

[0028] In its initial state, the water meter structure is as follows: Figure 3 As shown, under the elastic force of the return spring 2 and the compression spring 9, the left end face of the limiting protrusion 13 on the vent shaft 3 abuts against the limiting end face inside the left side of the valve body 4, preventing the vent shaft 3 from moving. The front end face of the sealing sleeve 5 of the piston 8 also presses against the limiting end face of the valve body 4. The vent shaft 3 presses against the sealing gasket 6 and blocks the hole in the middle of the piston assembly for sealing. The O-ring seal 7 fits tightly against the side wall of the cavity inside the valve body 4, forming a pressure relief valve sealing layer. After the water meter is installed in the pipeline, water is supplied. After water is supplied, the water pressure inside the water meter 12 is usually 0.3-1 MPa. The water pressure acting on the front end of the piston assembly and the left end face of the limiting protrusion 13 of the vent shaft 3 is less than the elastic force of the return spring 2 and the compression spring 9. The vent shaft 3 and the piston assembly remain in their initial state and do not move.

[0029] When the temperature drops, the outer layer of water will freeze first. When the temperature drops and the water inside the water meter 12 freezes, the internal water pressure will increase due to the expansion of the water volume. When the water pressure increases to 2.5MPa, the water pressure acting on the left end face of the limit protrusion 13 and the front end face of the sealing sleeve 5 overcomes the elastic force of the return spring 2 and the compression spring 9, pushing the discharge shaft 3 and the piston assembly to move outward synchronously. During the movement, the piston 8 presses against and drives the movable plastic shell 11 to move outward together.

[0030] As the temperature continues to drop, the piston assembly and the vent shaft 3 continue to move outward under the push of the internal water pressure. When the limit nut 1 at the left end of the vent shaft 3 abuts against the outer end face of the valve body 4, the vent shaft 3 and the limit nut 1 stop moving. Under the action of water pressure, the piston assembly continues to move outward. During the movement, the right end face of the limit protrusion 13 and the sealing sleeve 5 separate, and the water contacts the right end face of the limit protrusion 13. The pressure difference borne by the vent shaft 3 decreases. Under the action of the return spring 2, the vent shaft 3 moves inward to reset itself. At this time, water flows from the water inlet hole of the sealing sleeve 5 into the hole inside the piston 8 from the left end, and flows out from the piston 8 from the right end, and then is discharged outside the water meter through the drain port of the movable plastic shell cover 11.

[0031] As water is discharged, the internal water pressure continues to decrease. Under the action of the compression spring 9, the piston assembly slowly moves inward to reset the water meter 12. During this movement, the movable plastic cover 11 is driven by the nut at the rear end of the piston 8 to move synchronously and reset. The drain outlet is sealed inside the water meter housing 15, and the reset is complete. In a continuous low-temperature environment, the above actions are repeated to protect the water meter 12 from damage due to excessive pressure during the freezing process.

[0032] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A freeze-proof water meter pressure relief valve characterized by, The pressure relief valve comprises a relief shaft (3), a valve body (4) and a piston assembly; the relief shaft (3) is inserted into the left end of the cavity of the valve body (4) from the right end of the valve body (4); the relief shaft (3) is sleeved with a return spring (2) on the left side; the left end of the relief shaft (3) is screwed with a limiting nut (1); the piston assembly is assembled into the cavity of the valve body (4) from the right end of the valve body (4), and the left end abuts against the inner end face of the valve body (4) and the right end extends out of the valve body (4); the piston assembly is sleeved with a compression spring (9) and a nut (10) in sequence; the nut (10) is screwed on the right end of the cavity of the valve body (4); the right end of the piston assembly is screwed with a movable plastic shell cover (11); and the valve body (4) is screwed in a water meter (12).

2. A freeze-proof water meter pressure relief valve according to claim 1, wherein The piston assembly comprises a sealing sleeve (5) and a piston (8); the sealing sleeve (5) is screwed on the left end of the piston (8); a sealing flat gasket (6) is arranged between the sealing sleeve (5) and the piston (8); and two O-shaped sealing rings (7) are further arranged on the piston (8).

3. A freeze-proof water meter pressure relief valve according to claim 2, wherein The piston (8) is a hollow piston; the sealing sleeve (5) is a sealing sleeve provided with a water inlet hole; the movable plastic shell cover (11) is a shell cover provided with a drain port; and the drain port is arranged on the side of the movable plastic shell cover (11).

4. A freeze-proof water meter pressure relief valve according to claim 3, wherein A limiting protrusion (13) is arranged on the relief shaft (3); the limiting protrusion (13) is a circular protrusion with a size larger than the left end outlet of the valve body (4); the relief shaft (3) is inserted from the water inlet hole of the sealing sleeve (5), and the limiting protrusion (13) abuts against and presses the sealing flat gasket (6).

5. The freeze-proof water meter pressure relief valve according to claim 1, wherein, A waterproof sealing ring (14) is arranged between the valve body (4) and the water meter (12).

6. A freeze-proof water meter pressure relief valve according to claim 1, wherein The water meter (12) comprises a water meter shell (15) and a meter cover (16); the meter cover (16) covers the water meter shell (15); a tempered glass (17) is arranged between the water meter shell (15) and the meter cover (16); a movement (18) is arranged in the water meter shell (15); and the valve body (4) is screwed in the water meter shell (15).

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