CN211550644U

CN211550644U - Safety valve with decompression, anti-backflow function

Info

Publication number: CN211550644U
Application number: CN202020038878.5U
Authority: CN
Inventors: 李培
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-01-08
Filing date: 2020-01-08
Publication date: 2020-09-22
Anticipated expiration: 2030-01-08

Abstract

The utility model discloses a safety valve with functions of pressure reduction and backflow prevention, which comprises a cylindrical valve shell, a central shaft, a shaft fixing part, a sealing part, a check valve body, a first spring and a second spring; the bottom end of the valve shell comprises a non-return convex ring, and the non-return convex ring is of an upward convex structure at the inner side of the bottom of the valve shell and is matched with the sealing part to prevent liquid from flowing backwards; the center pin includes integrated into one piece's apical axis and bottom shaft, it has overflow channel to open on the bottom shaft, non return valve body below, realizes the decompression. The utility model provides a safety valve, which realizes the effect of one-way flow of fluid in a pipeline under the action of two springs and an elastic sealing part; the pressure relief valve also has the effect of relieving pressure at abnormal high pressure, avoids the pipeline and the valve body from being damaged due to high pressure, and ensures the safety of the pipeline.

Description

Safety valve with decompression, anti-backflow function

Technical Field

The utility model belongs to the technical field of the valve, especially, relate to a safety valve with decompression, anti-backflow function.

Background

In the fields of medicine and chemical production and life, safety valves are required to be arranged at liquid junctions of different pipelines, and when the pipelines exceed a certain pressure, the safety valves enable liquid to automatically flow out through a bypass to release the pressure, so that overlarge pressure at the valve is avoided; meanwhile, in order to prevent the liquid from flowing back, a check valve is also needed.

The pressure reducing valve in the market reduces water pressure by means of local resistance of a flow passage in the valve to water flow, the range of water pressure drop is automatically regulated by water pressure difference of an inlet and an outlet of a film or two sides of a piston connected with a valve clack to complete closing action, and the pressure reducing valve does not have a non-return function.

The structure provided by the publication "pressure reducing check multifunctional valve" (application number: CN201710045017.2) combines the functions of a check valve and a pressure reducing valve into a whole, and the whole is controlled by interlocking. However, the structure is designed to have a large channel and a large caliber, and the purpose of reducing pressure and preventing backflow with small volume cannot be realized.

SUMMERY OF THE UTILITY MODEL

The utility model provides a safety valve with decompression, anti-backflow function can realize preventing the too big, the effect that prevents the adverse current simultaneously of pipeline local pressure with the decompression, and technical scheme is as follows:

a safety valve with pressure reduction and backflow prevention functions comprises a cylindrical valve shell, a central shaft, a shaft fixing part, a sealing part, a check valve body, a first spring and a second spring;

the bottom end of the valve shell comprises a non-return convex ring, and the non-return convex ring is of an upward convex structure at the inner side of the bottom of the valve shell and is matched with the sealing part to prevent liquid from flowing backwards;

the valve shell is fixedly connected with the shaft fixing part, the central shaft penetrates through the shaft fixing part, the check valve body and the sealing part, and the check valve body and the sealing part are positioned in the valve shell;

the first spring is arranged along the central shaft and positioned between the shaft fixing part and the check valve body, and the second spring is arranged along the central shaft and positioned below the sealing part;

the central shaft moves up and down and rotates along the shaft fixing part.

Preferably, the shaft fixing part comprises a linear bearing in contact with the central shaft, a fixing ring connected to the valve housing, and a connecting arm connecting the linear bearing and the fixing ring, and the fixing ring is provided with external threads and is matched and fixedly connected with internal threads arranged at the top end of the valve housing; the connecting arms are preferably three, and the gaps between the connecting arms can allow fluid to pass through; the linear bearing, the fixing ring and the connecting arm are fixedly connected or integrally formed.

Preferably, the sealing part comprises a square first sealing element close to the central shaft, a second sealing element close to the check convex ring and a sealing connecting element for connecting the first sealing element and the second sealing element, and the sealing part is made of high polymer flexible materials such as rubber; the thickness of the sealing connecting piece is smaller than that of the first sealing piece and the second sealing piece, and the second sealing piece is matched with the check convex ring to play a sealing role.

Preferably, the check valve body is of a disc-shaped structure, through holes are formed in the check valve body on two sides of the central shaft, the through holes are located above the first sealing element, and when no upper fluid acts on the through holes, the first sealing element blocks and seals the through holes.

When fluid from the water inlet below enters, the sealing part is pushed to move upwards, the second spring is stretched, the first spring is compressed, the second sealing piece is separated from the convex check ring, and the fluid flows out from a gap between the second sealing piece and the convex check ring and flows out through a gap between the connecting arms. When the pressure of the fluid from the upper water outlet is slightly larger than that of the water inlet, the fluid from the upper part enters the check valve body from the gap between the connecting arms, the first sealing element is pressed by the through hole, and at the moment, the first sealing element, the first spring and the second spring generate pressure on the fluid from the upper part to prevent backflow.

Preferably, the center pin includes integrated into one piece's apical axis and bottom shaft, the diameter of apical axis is greater than the diameter of bottom shaft, the check valve body is located the juncture of apical axis and bottom shaft, open on the bottom shaft, check valve body below has overflow channel, and is preferred, overflow channel is located the bottom shaft of the one side of check valve body through-hole, overflow channel begins in check valve body below, ends in first sealing member below.

Preferably, the bottom end of the first sealing element is fixedly provided with a second spring fixing seat, the bottom end of the central shaft is fixedly provided with a second spring fixing disk, and two ends of the second spring are respectively fixed on the second spring fixing seat and the second spring fixing disk.

Compared with the prior art, the beneficial effects of the utility model are that:

(1) the utility model provides a safety valve with anti-reflux function, which realizes the effect of one-way flow of fluid in the pipeline under the action of two springs and an elastic sealing part;

(2) the structure of the utility model also has the effect of pressure relief under abnormal high pressure, avoids the damage of the pipeline and the valve body due to high pressure, and ensures the safety of the pipeline;

(3) the device has compact structure and is convenient to assemble and disassemble.

Drawings

The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.

Fig. 1 is a schematic view of the overall structure of the safety valve provided by the present invention;

fig. 2 is a front view of the safety valve according to the present invention;

fig. 3 is a schematic structural view of a sealing portion of the safety valve provided by the present invention;

fig. 4 is a schematic structural diagram of a central shaft of the safety valve provided by the present invention;

fig. 5 is a schematic view illustrating deformation of a sealing portion of the safety valve provided by the present invention when the safety valve is under an abnormally high pressure;

fig. 6 is a schematic view of a fixing structure of a valve housing and a shaft fixing portion as an alternative in the safety valve provided by the present invention.

The valve comprises a valve shell 1, a central shaft 2, a shaft 3, a shaft fixing part 4, a sealing part 5, a check valve body 6, a first spring 7, a second spring 11, a check convex ring 21, a top shaft 22, a bottom shaft 23, an overflow channel 31, a linear bearing 32, a fixing ring 33, a connecting arm 41, a first sealing element 42, a second sealing element 43, a sealing connecting element 51, a through hole 71, a second spring fixing seat 72 and a second spring fixing disk.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

A safety valve with pressure reduction and backflow prevention functions comprises a cylindrical valve shell 1, a central shaft 2, a shaft fixing part 3, a sealing part 4, a check valve body 5, a first spring 6 and a second spring 7, wherein a water inlet end is arranged below the valve shell 1 shown in the figure 1, and a water outlet end is arranged above the valve shell 1 shown in the figure 1;

the bottom end of the valve shell 1 comprises a non-return convex ring 11, the non-return convex ring 11 is of an upward convex structure at the inner side of the bottom of the valve shell 1 and is matched with the sealing part 4 to prevent liquid from flowing backwards;

the valve shell 1 is fixedly connected with the shaft fixing part 3, the central shaft 3 penetrates through the shaft fixing part 3, the check valve body 5 and the sealing part 4, and the check valve body 5 and the sealing part 4 are positioned inside the valve shell 1;

the first spring 6 is arranged along the central shaft 2 and positioned between the shaft fixing part 3 and the check valve body 5, and the second spring 7 is arranged along the central shaft 2 and positioned below the sealing part 4;

the shaft fixing part 3 comprises a linear bearing 31 contacted with the central shaft 2, a fixing ring 32 connected to the valve shell 1 and a connecting arm 33 connecting the linear bearing 31 and the fixing ring 32, and the fixing ring 32 is provided with an external thread and is matched and fixedly connected with an internal thread arranged at the top end of the valve shell 1;

as an alternative fixing manner, as shown in fig. 6, the shaft fixing portion 3 includes a linear bearing 31 contacting the central shaft 2 and three connecting arms 34, the connecting arms 34 are L-shaped, an inner groove is provided on an outer side of a distal end of each L-shaped connecting arm 34, an outer convex edge is provided on an inner side of a top end of the valve housing 1, and the inner groove of each L-shaped connecting arm 34 cooperates with the outer convex edge of the valve housing 1 to fixedly connect the shaft fixing portion 3 with the valve housing 1;

the linear bearing 31 is a common structure in the mechanical field, and can allow the central shaft 2 to move up and down and rotate along the shaft fixing part 3; the connecting arms 33 are preferably three, and the space between the connecting arms 33 can allow fluid to pass through; the linear bearing 31, the fixing ring 32 and the connecting arm 33 are fixedly connected or integrally formed.

As shown in fig. 3, the sealing part 4 includes a square first sealing member 41 near the central axis, a second sealing member 42 near the check convex ring 11, and a sealing connector 43 connecting the first sealing member 41 and the second sealing member 42, and the sealing part 4 is made of an elastic material, such as a polymer flexible material like rubber; the thickness of the sealing connector 43 is smaller than that of the first sealing element 41 and the second sealing element 42, and the second sealing element 42 is matched with the convex check ring 11 to play a sealing role.

As shown in fig. 1, the check valve body 5 has a disk-shaped structure, and through holes 51 are formed in the check valve body on both sides of the central shaft 2, the through holes 51 are located above the first sealing member 41, and when no upper fluid acts, the first sealing member 41 blocks and seals the through holes 51.

When fluid from the lower water inlet is introduced, the pushing seal part 4 moves upwards, the second spring 7 is stretched, the first spring 6 is compressed, the second sealing element 42 is separated from the convex check ring 11, and the fluid flows out from the gap between the second sealing element 42 and the convex check ring 11 and flows out through the gap between the connecting arms 33. When the pressure of the fluid from the upper water outlet is slightly larger than that of the water inlet, the fluid from the upper part enters the check valve body 1 through the gap between the connecting arms 33, the first sealing element 41 is pressed by the through hole 51, and the first sealing element 41, the first spring 6 and the second spring 7 generate pressure on the fluid from the upper part at the moment, so that the reverse flow is prevented.

The first spring 6 adopts a spring with smaller load, so that the water flow at the water inlet end can overcome the elasticity of the spring;

the second spring 7 generates upward pressure to the sealing part 4, the sealing part 4 is attached to the check valve body 5, the second spring 7 adopts a spring with a large load, and the situation that the second spring pushes the first sealing element can be overcome by slightly increasing the pressure of the water outlet end is avoided.

As shown in fig. 4, the central shaft 2 includes a top shaft 21 and a bottom shaft 22 which are integrally formed, the diameter of the top shaft 21 is greater than that of the bottom shaft 22, the check valve body 5 is located at the junction of the top shaft 21 and the bottom shaft 22, an overflow channel 23 is opened on the bottom shaft 22 and below the check valve body 5, preferably, the overflow channel 23 is located on the bottom shaft 22 on the same plane as the through hole of the check valve body 5, and the overflow channel 23 starts below the check valve body 5 and ends below the first sealing element 41.

When the fluid pressure of the water outlet from the upper part is overlarge and exceeds the fluid pressure of the water inlet from the lower part and the elastic forces of the first spring 6 and the second spring 7, the pressure is required to be relieved in order to avoid the damage of the pipeline and the valve and ensure the safety of the pipeline. As shown in fig. 5, the fluid from above pushes the first sealing member 41 downward away from the check valve body 5 through the through hole 51, the sealing portion 4 is pressed to be deformed, the second sealing member 42 is caught on the check convex ring 11, the first sealing member 41 is pushed out by the water flow at a certain distance, the water flow enters the inlet end through the gap between the check valve body 5 and the first sealing member 41 and the overflow passage 23, a part of the pressure is removed, and the pipeline safety is protected.

Preferably, the bottom end of the first sealing element 41 is fixedly provided with a second spring fixing seat 71, the bottom end of the central shaft 2 is fixedly provided with a second spring fixing disk 72, two ends of the second spring are respectively fixed on the second spring fixing seat 71 and the second spring fixing disk 72, and the fixing mode can be a screw fixing mode or other fixing modes.

The utility model provides a relief valve with decompression, prevent refluence, when intaking end and outlet end pressure difference are not big, under the pressure of first spring and second spring and both ends rivers, check valve body 5 pastes tight first sealing member 41, and tight non return bulge loop 11 is pasted to second sealing member 42, guarantees that there is not the fluid at both ends to mix.

When the valve at the water inlet end is opened, the pressure at the water inlet end is increased, the acting force of the water outlet end, the first spring and the second spring is overcome, the second sealing element 42 is pushed away from the convex check ring 11, and water flows upwards and flows out through the inner cavity of the valve body 1 and the connecting arm 33.

When the pressure of the water outlet end is slightly larger, the fluid from the upper part presses the check valve body 5 to further press the sealing part 4 to be attached to the check convex ring 1, so that the fluid at the water outlet end is prevented from flowing backwards.

In conclusion, the safety valve provided by the utility model has the function of non-return and backflow prevention when the pressure is normal; when the pressure is abnormally high, the pressure relief function is realized.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A safety valve with functions of pressure reduction and backflow prevention is characterized by comprising a cylindrical valve shell, a central shaft, a shaft fixing part, a sealing part, a check valve body, a first spring and a second spring;

the central shaft moves up and down and rotates along the shaft fixing part.

2. The safety valve with pressure reducing and backflow preventing functions as claimed in claim 1, wherein the shaft fixing portion comprises a linear bearing in contact with the central shaft, a fixing ring connected to the valve housing, and a connecting arm connecting the linear bearing and the fixing ring, and the fixing ring is provided with an external thread and is matched and fixedly connected with an internal thread arranged at the top end of the valve housing; the number of the connecting arms is three, and gaps among the connecting arms can allow fluid to pass through; the linear bearing, the fixing ring and the connecting arm are fixedly connected or integrally formed.

3. The safety valve with the functions of pressure reduction and backflow prevention as claimed in claim 1, wherein the sealing part comprises a square first sealing element close to the central shaft, a second sealing element close to the convex check ring and a sealing connecting element for connecting the first sealing element and the second sealing element, and the sealing part is made of a high polymer flexible material such as rubber; the thickness of the sealing connecting piece is smaller than that of the first sealing piece and the second sealing piece, and the second sealing piece is matched with the check convex ring to play a sealing role.

4. The safety valve with pressure reducing and backflow preventing functions as claimed in claim 3, wherein the check valve body is of a disc-shaped structure, through holes are formed in the check valve body on two sides of the central shaft, the through holes are located above the first sealing element, and the first sealing element blocks and seals the through holes when no upper fluid acts on the through holes.

5. The safety valve with pressure reducing and backflow preventing functions as claimed in claim 3, wherein the central shaft comprises a top shaft and a bottom shaft which are integrally formed, the diameter of the top shaft is larger than that of the bottom shaft, the check valve body is located at the junction of the top shaft and the bottom shaft, an overflow channel is formed in the bottom shaft and below the check valve body, the overflow channel is located on the bottom shaft on the same face of the through hole of the check valve body, the overflow channel starts below the check valve body and ends below the first sealing element.

6. The safety valve with pressure reducing and backflow preventing functions as claimed in claim 3, wherein a second spring fixing seat is fixedly arranged at the bottom end of the first sealing element, a second spring fixing disk is fixedly arranged at the bottom end of the central shaft, and two ends of the second spring are respectively fixed on the second spring fixing seat and the second spring fixing disk.