Anti-freezing water meter pressure release valve

Abstract

The invention 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 device has the advantages of stable pressure relief period, water meter frost damage prevention and the like.

Description

Technical Field

[0001] The invention relates to the technical field of water meter antifreeze pressure relief, in particular to an antifreeze water meter pressure relief valve. Background Art

[0002] In southern my country, water meters are usually installed in outdoor environments. When the winter weather encounters extreme cold waves, the water inside the water meter will also freeze due to the drop in temperature, and the volume will increase, causing the internal pressure of the water meter to increase, which often causes damage to the water meter. In cold rainy and snowy weather, it will be very difficult to maintain and replace broken and damaged water meters, and long-term water outages will bring inconvenience to residents' lives. Therefore, most water meter manufacturers are developing and designing various water meter anti-freeze structures to reduce the economic losses caused by freezing and reduce the impact of inconvenience on residents' daily water use.

[0003] Chinese patent CN201811022628.6 discloses an antifreeze water meter, on which a discharge mechanism is provided, including a discharge pipe, a conduit, a piston, a spring, a pressure ring and other components. When the internal ice causes excessive pressure, the water pressure overcomes the elastic force of the spring to move the piston outward, and the water enters the discharge pipe from the conduit and is discharged. However, since the compression amount of water is very small, liquids are usually regarded as incompressible substances. After the water pressure pushes the piston open and leaks out of the meter, the internal water pressure of the discharge mechanism drops, and the spring pushes the piston to restore the sealing state. Since the amount of water discharged each time is very small, the piston will be in a critical state of sealing and discharge for a long time. The piston will repeatedly shake in this interval, wear the sealing component, and reduce the service life of the product. Summary of the invention

[0004] The purpose of the present invention is to provide an antifreeze water meter pressure relief valve in order to overcome the defects of the above-mentioned prior art.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A pressure relief valve for an antifreeze water meter, the pressure relief valve comprising 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 sleeved on the left side of the relief shaft; the left end of the relief shaft is threadedly screwed with a limit nut; the piston assembly is assembled into the valve body cavity from the right end of the valve body, with the left end abutting against the inner end face of the valve body and the right end extending out of the valve body; a compression spring and a nut are sleeved on the piston assembly in sequence; the nut is screwed onto the right end of the valve body cavity; a movable plastic shell cover is screwed onto the right end of the piston assembly; the valve body is threadedly screwed into a water meter.

[0007] Furthermore, the piston assembly comprises a sealing sleeve and a piston; the sealing sleeve is threadedly screwed on the left end of the piston; a sealing flat gasket is arranged between the sealing sleeve and the piston; and two O-rings are also arranged on the piston.

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

[0009] Furthermore, a limiting protrusion is arranged on the discharge shaft; the limiting protrusion is a circular protrusion whose size is larger than the outlet at the left end of the valve body; the discharge shaft is inserted from the water inlet hole of the sealing sleeve, and the limiting protrusion abuts against and squeezes the sealing flat gasket.

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

[0011] Furthermore, the water meter comprises a water meter housing and a meter cover; the meter cover is placed above the water meter housing; tempered glass is arranged between the water meter housing and the meter cover; an organic movement is arranged 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] The present invention uses a discharge shaft and a piston assembly in coordination. When the water pressure inside a frozen water meter increases, the discharge shaft and the piston assembly cooperate to discharge excess water inside the water meter, thereby balancing the internal pressure of the water meter and preventing the water meter from freezing. In addition, compared with a discharge mechanism using only a single piston, the pressure discharge cycle of the present invention is more stable, the piston assembly will not always be in a critical state of sealing and discharge, and the wear is small, and the service life is long. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the structure of the pressure relief valve provided by the present invention;

[0015] Figure 2 A schematic diagram of the assembly structure of the pressure relief valve provided by the present invention;

[0016] Figure 3 This is a schematic diagram of the pressure relief valve provided by the present invention being assembled to a water meter structure.

[0017] The numbers in the figure are as follows:

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

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can 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 invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0022] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

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

[0024] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only 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 to 3 As shown, an antifreeze water meter pressure relief valve, the pressure relief valve is threadedly screwed 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 arranged between the water meter housing 15 and the meter cover 16; a movement 18 is arranged 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 to the left end of the inner cavity of the valve body 4; a reset spring 2 is sleeved on the left side of the relief shaft 3; the relief shaft 3 The left end thread is screwed with a limit nut 1, which is used to limit the left end of the discharge shaft 3; a limit protrusion 13 is arranged on the discharge shaft 3; the limit protrusion 13 is a circular protrusion larger than the outlet of the left end of the valve body 4, which is used to limit the right end of the discharge shaft 3; the piston assembly is assembled from the right end of the valve body 4 into the cavity of the valve body 4, with the left end against the inner end surface of the valve body 4 and the right end extending out of the valve body 4; the piston assembly is sequentially sleeved with a compression spring 9 and a nut 10; 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; the valve body 4 The valve body 4 is screwed into the water meter housing 15 of the water meter 12; a waterproof sealing ring 14 is arranged 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 screwed into the left end of the piston 8; a sealing flat gasket 6 is arranged 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 flat gasket 6; the piston 8 is also provided with Two O-rings 7 are used to fit tightly with the side walls of the cavity in the valve body 4 to seal the water inside the water meter and prevent leakage from the side walls; the piston 8 is a piston with a hollow interior; the movable plastic shell cover 11 is a shell cover provided with a drain port; the drain port is provided on the side of the movable plastic shell cover 11. Under normal circumstances, the drain port is enclosed in 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 of the piston 8 from the right end, and then is discharged to the outside of the water meter through the drain port of the movable plastic shell cover 11.

[0027] The working principle of the present invention is:

[0028] In the initial state, the water meter structure is as follows Figure 3 As shown, at this time, under the elastic force of the reset spring 2 and the compression spring 9, the left end face of the limiting protrusion 13 on the discharge shaft 3 presses against the limiting end face inside the left side of the valve body 4 so that the discharge shaft 3 no longer moves, and the front end face of the sealing sleeve 5 of the piston 8 also squeezes and presses against the limiting end face of the valve body 4. The discharge shaft 3 squeezes the sealing flat gasket 6 and blocks the hole in the middle of the piston assembly for sealing. The O-ring 7 fits tightly with the side wall of the cavity in the valve body 4 to form a pressure relief valve sealing layer. After the water meter is installed in the pipeline, water is passed through. After the water is passed through, the water pressure inside the water meter 12 is usually 0.3-1MPa. The water pressure acting on the front end of the piston assembly and the left end face of the limiting protrusion 13 of the discharge shaft 3 is less than the elastic force of the reset spring 2 and the compression spring 9, and the discharge shaft 3 and the piston assembly remain in the initial state without action.

[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 frozen water volume. When the water pressure increases to 2.5MPa, the water pressure acting on the left end face of the limiting protrusion 13 and the front end face of the sealing sleeve 5 overcomes the elastic force of the reset 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 resists and drives the movable plastic shell cover 11 to move outward together.

[0030] When the temperature continues to drop, the piston assembly and the discharge 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 discharge shaft 3 presses against the outer end surface of the valve body 4, the discharge shaft 3 and the limit nut 1 stop moving. Under the action of the water pressure, the piston assembly continues to move outward. During the movement, the right end surface of the limit protrusion 13 and the sealing sleeve 5 are separated, and the water contacts the right end surface of the limit protrusion 13. The pressure difference on the discharge shaft 3 is reduced. Under the action of the reset spring 2, the discharge shaft 3 moves toward the inside of the water meter 12 and resets. At this time, water flows from the water inlet hole of the sealing sleeve 5 from the left end into the hole inside the piston 8, and flows out of 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.

[0031] As the water is discharged, the internal water pressure continues to decrease. Under the action of the compression spring 9, the piston assembly slowly moves toward the inside of the water meter 12 to reset. During the movement, the movable plastic cover 11 is driven by the nut at the rear end of the piston 8 to move synchronously to reset. The drain port is sealed in the water meter case 15, and the reset is completed. 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 low temperature freezing process.

[0032] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. An antifreeze water meter pressure relief valve, characterized in that: The pressure relief valve comprises 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 cavity of the valve body (4); a return spring (2) is sleeved on the left side of the relief shaft (3); the left end of the relief shaft (3) is threadedly screwed with a limit nut (1); the piston assembly is assembled into the cavity of the valve body (4) from the right end of the valve body (4), with the left end abutting against the inner end surface of the valve body (4) and the right end extending out of the valve body (4); a compression spring (9) and a nut (10) are sleeved on the piston assembly in sequence; 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) is threadedly screwed into a water meter (12).

2. The antifreeze water meter pressure relief valve according to claim 1, characterized in that: The piston assembly comprises a sealing sleeve (5) and a piston (8); the sealing sleeve (5) is threadedly connected to 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-rings (7) are also arranged on the piston (8).

3. The antifreeze water meter pressure relief valve according to claim 2, characterized in that: The piston (8) is a piston with a hollow interior; 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 drainage port; and the drainage port is provided on the side of the movable plastic shell cover (11).

4. The antifreeze water meter pressure relief valve according to claim 3, characterized in that: The discharge shaft (3) is provided with a limiting protrusion (13); the limiting protrusion (13) is a circular protrusion whose size is larger than the outlet at the left end of the valve body (4); the discharge 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 antifreeze water meter pressure relief valve according to claim 1, characterized in that: A waterproof sealing ring (14) is provided between the valve body (4) and the water meter (12).

6. The antifreeze water meter pressure relief valve according to claim 1, characterized in that: The water meter (12) comprises 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 arranged between the water meter housing (15) and the meter cover (16); an organic core (18) is arranged inside the water meter housing (15); and the valve body (4) is screwed into the water meter housing (15) by means of a thread.

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