CN217977556U

CN217977556U - Low-resistance slow-closing check valve

Info

Publication number: CN217977556U
Application number: CN202221276350.7U
Authority: CN
Inventors: 吴光海; 雒平; 王德武; 李星亮; 叶建生
Original assignee: Third Construction Co Ltd of China Construction Third Engineering Division
Current assignee: Third Construction Co Ltd of China Construction Third Engineering Division
Priority date: 2022-05-25
Filing date: 2022-05-25
Publication date: 2022-12-06
Anticipated expiration: 2032-05-25

Abstract

The utility model relates to the technical field of valves, in particular to a low-resistance slow-closing check valve; this check valve includes valve body, piston cavity and can reciprocate under the rivers effect first case, first case with the piston cavity sets up inside the valve body, be provided with in the piston cavity with the piston that first case is connected, the lower tip of piston cavity is provided with the orifice, and orifice department is connected with the honeycomb duct, is provided with the needle valve on the honeycomb duct, piston cavity bottom is provided with holding chamber, second case and second spring. The utility model provides a check valve, simple structure, the suitability is strong, and the piston that first case lower extreme is connected can slow down the falling speed, plays the effect of slowly closing.

Description

Low-resistance slow-closing check valve

Technical Field

The utility model relates to the technical field of valves, especially, relate to a low resistance slowly closes check valve.

Background

The check valve is a valve with a circular valve clack as an opening and closing part and acts by the weight of the valve and the pressure of a medium to block the backflow of the medium, and is widely applied to various fields. The prior check valve has the following problems in the use process: 1) Excessive running resistance, 2) excessive noise and vibration during running; although the slow-closing check valve can reduce the noise of the check valve in the operation process, the slow-closing check valve has great resistance loss in the operation process and influences the use of the check valve. Therefore, a low resistance slow-closing check valve is needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a low resistance slow-closing check valve, including valve body, piston cavity and the first case that can reciprocate under the rivers effect, first case with the piston cavity sets up inside the valve body, be provided with in the piston cavity with the piston that first case is connected, the lower tip of piston cavity is provided with the orifice.

Further, the outer side wall of the piston is abutted to the inner wall of the piston chamber, and a sealing ring is arranged between the piston and the piston chamber.

Furthermore, a groove capable of containing the sealing ring is formed in the outer side wall of the piston, and the outer side of the sealing ring abuts against the inner wall of the piston cavity.

Further, the piston chamber is disposed proximate to the water inlet end of the valve body.

Furthermore, one end, far away from the piston cavity, of the first valve core is sleeved with a first spring, and the upper end of the first spring is connected with the valve body.

Furthermore, the piston type water-saving valve further comprises a flow guide pipe, one end of the flow guide pipe is connected with the throttling hole, the other end of the flow guide pipe is communicated with the inside of the valve body, a needle valve is further arranged on the flow guide pipe, and a water inlet hole is formed in the bottom of the piston cavity.

Furthermore, the bottom of the piston cavity is provided with an accommodating cavity communicated with the water inlet hole, the bottom of the accommodating cavity is provided with an opening, a second valve core and a second spring are arranged in the accommodating cavity, one end of the second spring is connected with the second valve core, and the other end of the second spring is connected with the accommodating cavity.

Furthermore, the other end of the flow guide pipe extends out of the outer side of the valve body and then is communicated with the inside of the valve body, and the needle valve is arranged on the outer side of the valve body.

Further, a valve seat is further arranged inside the valve body and located below the first valve core, and the inner diameter of the valve seat is smaller than the outer diameter of the valve plate of the first valve core.

The utility model discloses owing to adopt above technical scheme, make it compare with prior art, have following beneficial effect:

1) The low-resistance slow-closing check valve provided by the utility model has the advantages of simple structure, good flow characteristic, low requirement on the installation position and stronger applicability;

2) The low-resistance slow-closing check valve provided by the utility model has the advantages that the first valve core moves upwards under the action of water flow impact to reduce the bottom pressure of the piston cavity, water flow rapidly enters the piston cavity, the piston cavity is filled with water and then keeps running in the state, the flow area of the check valve is large, and the direction of the water flow is not changed, so that the check valve has lower flow resistance;

3) The utility model provides a low resistance slow-closing check valve, when first case received the water hammer against the current, first case downstream drove the piston downstream, and the water in the piston chamber is discharged slowly from the orifice to reduce the functioning speed of first case, played the slow effect of closing.

Drawings

Fig. 1 is a schematic structural view of a check valve according to embodiment 1 of the present invention;

fig. 2 is a schematic structural view of a check valve in embodiment 2 of the present invention.

1-a valve body; 2-a first valve core; 3-a piston chamber; 4-a piston; 5-orifice; 6-sealing ring; 7-a first spring; 8-valve seat; 9-a valve plate; 10-a flow guide pipe; 11-needle valves; 12-an accommodating chamber; 13-a second valve spool; 14-second spring.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention based on the embodiments of the present invention. In the drawings, the size and relative sizes of certain features may be exaggerated for clarity.

In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral part; can be mechanically or electrically connected; the term "connected" may be directly connected or indirectly connected through an intermediate medium, and may be a connection between two elements or an interaction relationship between two elements, and those skilled in the art can understand the specific meaning of the above terms in the present invention in specific situations.

In the description of the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "center", "horizontal", "vertical", "top", "bottom", "inner", "outer", and the like are used in the orientation or positional relationship shown in the drawings, only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be considered as limiting the present invention.

Furthermore, in the description of the present invention, the terms "first" and "second" are used merely for descriptive distinction and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

Example 1

As shown in the attached drawing 1 of the specification, the utility model provides a low-resistance slow-closing check valve, which comprises a valve body 1, a piston chamber 3 and a first valve core 2 capable of moving up and down under the action of water flow, wherein the first valve core 2 realizes the opening and closing of the check valve in the up-and-down moving process, the first valve core 2 and the piston chamber 3 are arranged inside the valve body 1, a piston 4 connected with the first valve core 2 is arranged in the piston chamber 3, and the lower end part of the piston chamber 3 is provided with a throttling hole 5; specifically, in this embodiment, the lower end of the valve body 1 is a water inlet end, the upper end is a water outlet end, the first valve core 2 moves up and down under the action of water flow, the first valve core 2 can drive the piston 4 to move up and down in the piston chamber 3 in the moving process, so as to change the air pressure in the piston chamber 3, when the check valve is opened, the first valve core 2 drives the piston 4 to move up, water enters the piston chamber 3 through the orifice 5 and fills the piston chamber 3, and then the operation state is maintained, the flow area of the check valve is large, and the water flow direction is unchanged, so that the flow resistance is low, when the check valve is closed, the first valve core 2 moves down under the action of reverse water flow, so as to drive the piston 4 to move down in the piston chamber 3, so that the pressure of the piston chamber 3 is increased, water in the piston chamber 3 is discharged through the orifice 5, so as to reduce the downward operation speed of the first valve core 2, and achieve a slow closing effect, the position and size of the orifice 5 can be set according to actual use requirements, and one or more than one orifice 5 can be set at the lower end of the piston chamber 3.

The implementation mode is optimized, the outer side wall of the piston 4 abuts against the inner wall of the piston cavity 3, the piston 4 and the piston cavity 3 can be sealed, water can enter the sealed cavity 3 through the throttling hole 5 in the upward moving process of the piston 4, water is discharged out of the piston cavity 3 through the throttling hole 5 under the pressure of the piston 4 in the downward moving process of the piston 4, the piston 4 and the piston cavity 3 are provided with the sealing ring 6, the outer side wall of the piston 4 is provided with a groove capable of containing the sealing ring 6, the outer side of the sealing ring 6 abuts against the inner wall of the piston cavity 3, the sealing between the piston 4 and the piston cavity 3 is further enhanced, and the piston 4 and the sealing ring 6 can be made of plastics, rubber or silica gel.

In an optimized implementation mode, the piston chamber 3 is arranged close to the water inlet end of the valve body 1, a first spring 7 is sleeved at one end, far away from the piston chamber 3, of the first valve core 2, the upper end of the first spring 7 is connected with the valve body 1, the first spring can be compressed in the upward movement process of the first valve core, and when water flow is reduced, the first valve core can be driven to move downwards under the elastic action of the first spring, so that the closing of a check valve is realized; specifically, the valve body 1 is further internally provided with a valve seat 8, the valve seat 8 is located below the first valve core 2, the inner diameter of the valve seat 8 is smaller than the outer diameter of the first valve core 2, the first valve core 2 further comprises a valve plate 9, the outer diameter of the valve plate 9 is larger than the inner diameter of the valve seat 8, water flow impacts the valve plate 9 to enable the first valve core 2 to move up and down, when the valve plate 9 contacts with the valve seat 8, the water stop valve is closed, and when the valve plate 9 leaves the valve seat 8, the water stop valve is opened.

Example 2

As shown in the attached fig. 2 of the specification, the present invention provides another low resistance slow-closing check valve, the structures of the valve body 1, the first valve core 2, the piston chamber 3 and the piston 4 are the same as those of the embodiment 1, and are not described herein again, and other same structures are not described again; in this embodiment, the check valve further includes a flow guide pipe 10, one end of the flow guide pipe 10 is connected to the throttle hole 5, the other end of the flow guide pipe 10 is communicated with the inside of the valve body 1, the flow guide pipe 10 is further provided with a needle valve 11, the needle valve 11 can adjust the flow rate, so as to adjust and control the slow-closing speed of the check valve, the other end of the flow guide pipe 10 extends out of the outside of the valve body 1 and then is communicated with the inside of the valve body 1, and the needle valve 11 is arranged outside the valve body 1; the bottom of the piston cavity 3 is provided with a water inlet, the bottom of the piston cavity 3 is provided with an accommodating cavity 12 communicated with the water inlet, the bottom of the accommodating cavity 12 is provided with an opening, a second valve core 13 and a second spring 14 are arranged in the accommodating cavity 12, one end of the second spring 14 is connected with the second valve core 13, the other end of the second spring is connected with the accommodating cavity 12, and the second spring 14 is sleeved on the second valve core 13.

The working principle of the embodiment is that when the check valve is opened, the valve plate 9 of the first valve core 2 is impacted by water flow in the pipeline to form an upward movement trend, so that the bottom pressure of the piston chamber 3 is reduced, the second valve core 13 at the bottom moves upward, the second valve core 13 is opened, the water flow rapidly enters the piston chamber 3, the piston chamber 3 is filled with water and then keeps running in the state, and the check valve has lower flow resistance because the flow area is larger and the direction of the water flow is not changed; the valve plate 9 of the first valve core 2 is impacted by the downward water flow to have a downward movement tendency, so that the pressure of the piston chamber 3 is increased, the second valve core 13 at the bottom moves downwards to be closed, water flows into the valve body 1 from the needle valve 11, the downward operation speed of the first valve core 13 is reduced, the slow closing effect is achieved, and the needle valve 11 can be adjusted to control the descending speed of the first valve core 2.

And those not described in detail in this specification are well within the skill of those in the art.

It will be appreciated by those skilled in the art that the invention can be embodied in many other specific forms without departing from the spirit or scope of the invention. Although the embodiments of the present invention have been described, it is to be understood that the present invention should not be limited to such embodiments, and that changes and modifications can be made by one skilled in the art within the spirit and scope of the present invention as defined by the appended claims.

Claims

1. The utility model provides a low resistance slow-closing check valve, its characterized in that includes valve body, piston cavity and can reciprocate under the rivers effect first case, first case with the piston cavity sets up inside the valve body, be provided with in the piston cavity with the piston that first case is connected, the lower tip of piston cavity is provided with the orifice.

2. The low-drag slow-closing check valve of claim 1, wherein the outer side wall of the piston abuts against the inner wall of the piston chamber, and a seal ring is arranged between the piston and the piston chamber.

3. The low resistance slow closing check valve of claim 2 wherein the outer sidewall of the piston is provided with a groove for receiving the sealing ring, and the outer side of the sealing ring abuts against the inner wall of the piston chamber.

4. The low-drag slow closing check valve of claim 1 wherein the piston chamber is disposed proximate the water inlet end of the valve body.

5. The low drag slow closing check valve of claim 1 wherein an end of the first spool remote from the piston chamber is sleeved with a first spring, the upper end of the first spring being connected to the valve body.

6. The low-resistance slow-closing check valve according to claim 1, further comprising a flow guide pipe, wherein one end of the flow guide pipe is connected with the throttling hole, the other end of the flow guide pipe is communicated with the inside of the valve body, a needle valve is further arranged on the flow guide pipe, and a water inlet hole is formed in the bottom of the piston chamber.

7. The low-resistance slow-closing check valve according to claim 6, wherein an accommodating chamber communicated with the water inlet hole is arranged at the bottom of the piston chamber, an opening is arranged at the bottom of the accommodating chamber, a second valve core and a second spring are arranged in the accommodating chamber, one end of the second spring is connected with the second valve core, and the other end of the second spring is connected with the accommodating chamber.

8. The low resistance slow-closing check valve of claim 6, wherein the other end of the flow guide pipe extends out of the outside of the valve body and then is communicated with the inside of the valve body, and the needle valve is arranged outside the valve body.

9. The low drag slow closing check valve of claim 1 wherein a valve seat is further provided inside the valve body, the valve seat is located below the first valve element, and the inner diameter of the valve seat is smaller than the outer diameter of the valve plate of the first valve element.