Self-adaptive vacuum time-delay reset valve

Abstract

A self-adaptive vacuum delay reset valve comprises a valve body with an inner cavity, a valve seat and a valve element assembly, an internal thread through hole is formed in the top end of the valve body, and a through hole with a mouth is formed in the lower end of the valve body and connected with an opening in the upper end of the valve seat. The valve element assembly is arranged in the valve body and comprises an upper stop ring, a rubber diaphragm, a lower gasket and a pin, an internal thread blind hole is formed in the top end of the pin, a grooved cone frustum is arranged at the bottom end of the pin, and a screw sequentially penetrates through the upper stop ring, the rubber diaphragm and the lower gasket from top to bottom and is in threaded connection with the pin; the valve body comprises an upper cover and a lower cover, a vent hole is formed in the lower cover, the rubber diaphragm is fixed between the upper cover and the lower cover through a bolt, and a compression spring is arranged between the upper cover and the valve element assembly. The time for closing the vacuum diaphragm valve in a delayed manner can be automatically adjusted according to the negative pressure in the vacuum pipeline, the negative pressure at the tail end of the vacuum pipeline is guaranteed to be stable, and normal operation of a vacuum drainage system is maintained.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and in particular to an adaptive vacuum delay reset valve. Background Art

[0002] Vacuum drainage systems rely primarily on a pressure differential between the inside and outside of vacuum pipes. Atmospheric pressure forces wastewater into the negatively pressurized vacuum pipes. The greater the pressure differential, the faster the wastewater travels through them. During vacuum pipe installation, some upward pressure is inevitably involved. During vacuum drainage, a plunger of water forms within the upward-facing vacuum pipe. The higher the plunger, the greater the pressure difference between the terminal and the pumping station. The terminal negative pressure can even approach atmospheric pressure, impacting wastewater extraction. To eliminate this plunger, the vacuum diaphragm valve can be closed for a period of time after each sewage extraction, allowing some air to be introduced. This forces the plunger into the vacuum tank and prevents the upward-facing plunger from forming. However, a vacuum drainage system may have dozens or even hundreds of drainage points, and the potential plunger height at each point can vary. Introducing too much air wastes vacuum, while inadequate air is insufficient to eliminate the plunger. Adjusting the air volume for each drainage point consumes significant manpower and resources. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide an adaptive vacuum delay reset valve, which automatically adjusts the delayed closing time of the vacuum diaphragm valve according to the size of the negative pressure in the vacuum pipeline, ensures the stability of the negative pressure at the end of the vacuum pipeline, and maintains the normal operation of the vacuum drainage system.

[0004] The technical solution to the technical problem solved by the utility model is as follows: an adaptive vacuum delay reset valve, comprising a valve body with an inner cavity, a valve seat and a valve core assembly, the structural feature of which is that an internal threaded through hole is provided at the top of the valve body, a through hole with a mouth is provided at the lower end and is connected to the valve seat, a filter ring is provided in the valve seat, and the valve core assembly is arranged in the valve body.

[0005] Furthermore, the upper end of the valve seat is open, and a centrally-through air exhaust nozzle and an air inlet nozzle are respectively provided at the front and back of the waist, which are communicated with the upper end opening through a flow limiting hole. A return air nozzle is also provided at the upper end of the air inlet nozzle and communicated with the upper end opening.

[0006] Furthermore, the valve core assembly includes an upper stop ring, a rubber diaphragm, a lower gasket and a pin. The top of the pin is provided with an internal threaded blind hole, and the bottom is a grooved frustum. The screw passes through the upper stop ring, rubber diaphragm and lower gasket from top to bottom in sequence and is threadedly connected to the pin.

[0007] Furthermore, the valve body and the valve seat are connected by a snap-fit connection.

[0008] Furthermore, the filter loop circulates air and filters impurities in the air.

[0009] Furthermore, the valve body includes an upper cover and a lower cover, the lower cover is provided with a vent hole, the rubber diaphragm is fixed between the upper cover and the lower cover by bolts, and a compression spring is provided between the upper cover and the valve core assembly.

[0010] Furthermore, the pin passes through the through hole at the lower end of the valve body, and the grooved frustum at the bottom end of the pin cooperates with the flow limiting hole.

[0011] Furthermore, the air extraction nozzle is connected to the vacuum switch valve, the air inlet nozzle is connected to the diaphragm valve, and the air return nozzle is connected to the atmosphere.

[0012] Furthermore, the internal threaded through hole at the top of the valve body is connected to the vacuum pipe, and the valve core assembly is acted upon by the elastic force of the compressed spring and the negative pressure suction in the vacuum pipe. The greater the negative pressure suction, the larger the flow area between the pin and the flow limiting hole, and the greater the amount of air passing from the return air nozzle to the air inlet nozzle per unit time; the smaller the negative pressure suction, the smaller the flow area between the pin and the flow limiting hole, and the minimum is only the groove-shaped cross-section at the bottom end of the pin, and the smaller the amount of air passing from the return air nozzle to the air inlet nozzle per unit time.

[0013] The beneficial effect of the utility model is that after the vacuum switch valve is closed, the diaphragm valve is reset and closed after air is introduced into the diaphragm valve, and the closing time is related to the negative pressure in the vacuum pipe. The greater the negative pressure in the vacuum pipe, the shorter the closing time of the diaphragm valve. Conversely, the smaller the negative pressure in the vacuum pipe, the longer the closing time of the diaphragm valve. This allows the vacuum pipe to inhale more air through the diaphragm valve, press the plunger-shaped water column in the pipe into the vacuum sewage tank, dredge the pipe, and increase the negative pressure in the vacuum pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0015] Figure 1 It is a schematic cross-sectional structure diagram of a specific embodiment of the present utility model.

[0016] Figure 2 It is a schematic diagram of the three-dimensional structure of a specific embodiment of the utility model.

[0017] Figure 3 This is a schematic diagram of the three-dimensional structure of the valve core assembly of the utility model.

[0018] Figure 4 This is a schematic diagram of the cross-sectional structure of the valve seat of the utility model. DETAILED DESCRIPTION

[0019] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0020] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which this utility model belongs.

[0021] like Figures 1 to 4 As shown, the adaptive vacuum delay reset valve includes a valve body with an inner cavity, a valve seat 1 and a valve core assembly 3. The top of the valve body is provided with an internal threaded through hole, and the lower end is a through hole with a nozzle and connected to the upper end opening of the valve seat 1; a filter ring 2 is provided in the valve seat 1, and a central air suction nozzle 101 and an air inlet nozzle 102 are provided at the front and back of the waist respectively, which are connected to the upper end opening through a flow limiting hole 104, and a return air nozzle 103 is also provided at the upper end of the air inlet nozzle 102 and is connected to the upper end opening; the valve core assembly 3 is arranged in the valve body, and the valve core assembly includes an upper stop ring 31, a rubber diaphragm 32, and a lower gasket. The top of the pin 34 is provided with an internal threaded blind hole, and the bottom is a grooved frustum. The screw passes through the upper stop ring, rubber diaphragm and lower gasket from top to bottom and is threadedly connected to the pin; the valve body includes an upper cover 7 and a lower cover 4, and the lower cover is provided with a vent hole 41. The rubber diaphragm 32 is fixed between the upper cover 7 and the lower cover 4 by bolts, and a compression spring 6 is provided between the upper cover 7 and the valve core assembly 3; the valve body and the valve seat 1 are connected by a snap-fit connection, the pin 34 passes through the through hole at the lower end of the valve body, and the grooved frustum at the bottom of the pin cooperates with the flow limiting hole 104.

[0022] In the above technical solution, the exhaust nozzle 101 is connected to the vacuum switch valve, the air inlet nozzle 102 is connected to the diaphragm valve, the return air nozzle 103 is connected to the atmosphere, and the internal threaded through hole at the top of the valve body is connected to the vacuum pipe, so that the inner cavity between the rubber diaphragm 32 and the upper cover 7 is in a negative pressure state, and the inner cavity between the rubber diaphragm 32 and the lower cover 4 is in a normal pressure state. Since the rubber diaphragm has a certain elasticity, the valve core assembly 3 can move within a limited distance in the vertical direction. The valve core assembly 3 is acted upon by the elastic force of the compressed spring 6 and the negative pressure suction force in the vacuum pipe. The greater the negative pressure suction force, the higher the position of the valve core assembly. The larger the flow area between the pin 34 and the flow limiting hole 104, the larger the amount of air that passes from the return nozzle 103 to the air inlet nozzle 102 per unit time after the vacuum switch valve is closed. Since the amount of air required for the diaphragm valve to reset and close is constant, the diaphragm valve closing time is shorter; the smaller the negative pressure suction force, the lower the position of the valve core assembly 3, the smaller the flow area between the pin 34 and the flow limiting hole 104, and the minimum is only the groove section at the bottom end of the pin 34. After the vacuum switch valve is closed, the smaller the amount of air that passes from the return nozzle 103 to the air inlet nozzle 102 per unit time, and the longer the diaphragm valve closing time.

Claims

1. An adaptive vacuum time-delay reset valve, comprising a valve body with an inner cavity, a valve seat (1) and a valve core assembly (3), characterized in that The top of the valve body is provided with an internal threaded through hole, the lower end is a through hole with a mouth and is connected to the valve seat (1), a filter ring (2) is provided in the valve seat, and a valve core assembly (3) is provided in the valve body; wherein, The upper end of the valve seat (1) is open, and a centrally-through air extraction nozzle (101) and an air inlet nozzle (102) are provided at the front and rear of the waist, respectively, which are communicated with the upper open end through a flow limiting hole (104). The upper end of the air inlet nozzle (102) is also provided with an air return nozzle (103) which is communicated with the upper open end; The valve core assembly (3) includes an upper stop ring (31), a rubber diaphragm (32), a lower gasket (33) and a pin (34). The top of the pin is provided with an internal thread blind hole, and the bottom is a frustum with a groove. The screw passes through the upper stop ring (31), the rubber diaphragm (32) and the lower gasket (33) from top to bottom and is threadedly connected to the pin (34). The valve body comprises an upper cover (7) and a lower cover (4), the lower cover is provided with a vent hole (41), the rubber diaphragm (32) is fixed between the upper cover (7) and the lower cover (4) by bolts, and a compression spring (6) is provided between the upper cover and the valve core assembly (3).

2. The adaptive vacuum delay reset valve according to claim 1, characterized in that The pin (34) passes through the through hole at the lower end of the valve body, and the grooved cone at the bottom end of the pin cooperates with the flow limiting hole (104).

3. The adaptive vacuum delay reset valve according to claim 2, characterized in that The valve body and the valve seat (1) are connected by a snap-fit connection.

4. The adaptive vacuum delay reset valve according to claim 3, characterized in that The air extraction nozzle (101) is connected to the vacuum switch valve, the air inlet nozzle (102) is connected to the diaphragm valve, the air return nozzle (103) is connected to the atmosphere, and the internal threaded through hole at the top of the valve body is connected to the vacuum pipeline.

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