WO2020015581A1

WO2020015581A1 - Pressure maintaining valve

Info

Publication number: WO2020015581A1
Application number: PCT/CN2019/095717
Authority: WO
Inventors: 范瑶飞
Original assignee: 范瑶飞
Priority date: 2018-07-19
Filing date: 2019-07-12
Publication date: 2020-01-23
Also published as: CN108662224A; CN108662224B

Abstract

A pressure maintaining valve. The pressure maintaining valve comprises a valve body (1) and a pressure maintaining valve core (2). The pressure maintaining valve core (2) comprises a first conical spring (21), a follower diaphragm (22), a first corrugated pipe (23), a follower valve rod (24), a valve core plug block (25), a second corrugated pipe (26), and a second conical spring (27).

Description

Pressure regulating valve

Technical field

The invention belongs to the field of invention, and particularly relates to a pressure regulating valve.

Background technique

Pressure reducing valve, also known as pressure reducing valve, is a special device that automatically reduces the working pressure of the pipeline. It can reduce the high water pressure in the pipeline before the valve to the level required by the pipeline behind the valve. Pressure reducing valves are widely used It is used in high-rise buildings, urban water supply pipe networks where the water pressure is too high, mines and other occasions to ensure that the water points in the water supply system get the appropriate service water pressure and flow.

The existing pressure regulating valve uses a spring pressure adjustment knob to achieve a stable adjustment when adjusting the pressure, but the existing pressure adjustment knob has a simple structure setting, and when used for a long time, the knob will loosen, and the knob will become loose. The pressure adjustment is not stable, which affects the effect of use.

Patent number CN206503955U Chinese utility model patent discloses a pressure regulator valve, which includes a valve body, a valve cover, a diaphragm is disposed between the valve body and the valve cover, and a chamber is disposed between the diaphragm and the valve body. A damping tube for communication is provided between the chamber and the liquid outlet. A communication port is provided between the liquid inlet and the liquid outlet. A valve core for connecting or closing the communication port is provided at the communication port. The diaphragm is connected to the valve core. The upper end of the diaphragm is provided with an adjusting component. The adjusting component includes a spring mounting seat, a pressure regulating spring is provided between the spring mounting seat and the diaphragm, a valve hole is provided with a mounting hole, and a spring mounting seat is provided with the valve cover. An adjustment knob that is threadedly connected to the mounting hole and drives the spring mounting seat to move up and down. The adjustment knob includes a housing and a ball provided in the housing. A driving spring that drives the ball to move up and down is also provided in the housing. A groove that interferes with the ball. The pressure regulating valve has stable pressure during pressure adjustment, which can effectively avoid the phenomenon of unstable pressure caused by the loosening of the adjustment knob. However, the pressure-stabilizing valve still has excessive stem friction, and the pressure is still unstable when the pressure difference changes drastically. Especially when frequent pressure fluctuations are large, it is easy to cause adjustment lag, which makes the pressure change larger. Can't adapt to very controllable occasions.

Summary of the invention

The purpose of the invention is to solve the problems of hysteresis and the like of the existing pressure-stabilizing valve, and provide a pressure-stabilizing valve capable of quickly and accurately adjusting the pressure.

In order to achieve the above-mentioned object, the present invention adopts the following technical solutions:

A pressure-stabilizing valve includes a valve body and a pressure-stabilizing valve core. Both ends of the valve body include a fluid inlet portion and a fluid outlet portion. The pressure-stabilizing valve core is located between the fluid inlet portion and the fluid outlet portion. The valve body further includes a valve core installation. The valve core mounting portion includes an upper mounting cavity portion, a lower mounting cavity portion, and a flow passage that connects the fluid inlet portion and the fluid outlet portion; the valve core includes a first cone spring, a follower diaphragm, a first bellows, and a follower valve Stem, plug block, second bellows and second cone spring; first cone spring, follower diaphragm, first bellows are located in the upper mounting cavity, and plug block, second bellows and second cone The spring is installed on the lower installation cavity; the upper part of the follower valve stem extends into the upper installation cavity, and the lower part is fixedly connected to the valve plug and extends into the lower installation cavity; the upper end of the second bellows is sealed and fixedly connected to the valve plug. The lower end of the two bellows is sealingly connected to the outer wall of the valve body at the upper end of the lower installation cavity; the lower end of the second cone spring is fixed to the bottom of the lower installation cavity, and the upper end is fixed to the bottom of the valve plug; the upper end of the first cone spring is fixed to the upper installation cavity Top part, the lower end of the first cone spring is connected to the follower diaphragm The middle part; the lower end of the first bellows is sealed and connected at the opening of the top of the flow channel, the upper end of the first bellows is sealedly connected at the middle of the follower diaphragm; the upper end of the follower valve stem is fixedly connected at the center of the follower diaphragm, The lower part of the valve stem is fixedly connected in the middle of the plug block and the lower end thereof penetrates into the lower installation cavity; the follower diaphragm is sealed in the middle of the upper installation cavity, under the follower diaphragm and outside the first bellows The fluid pressure balance chamber for the up and down movement of the middle portion of the follower diaphragm is connected to the output end of the flow channel side, and a two-way communication is provided between the fluid outlet and the fluid pressure balance chamber. The pressure equalizes the branch pipe between the two; the valve plug is between the inlet of the fluid inlet and the inlet of the flow channel. When the middle part of the follower diaphragm moves, the plug can follow the follower valve stem and The spring moves along the length of the follower valve stem to change the fluid output opening.

Preferably, in the upper mounting cavity, an upper positioning device is provided on the inner side of the first cone spring for the upward and downward movement of the follow-up valve stem; in the lower installation cavity, the second cone spring is provided on the inside of the second cone spring and is used for the upward and downward movement of the follow-up valve stem. Positioning device; the upper positioning device and the lower positioning device have the same structure, and both include a fixed bracket and a guide positioning ring, and a ring of balls is arranged in the guide positioning ring; the follower valve rod projects into the guide positioning ring and cooperates with the ball loose.

Preferably, a first air pressure balancing hole is provided on the top of the upper mounting cavity, and the first air pressure balancing hole communicates with the mounting cavity above the follower diaphragm; a second air pressure balancing hole and a second air pressure are provided on the lower mounting cavity. The balance hole communicates with the inner cavity below the inside of the second bellows.

Preferably, the position below the first air pressure balance hole corresponds to the position where the follower valve stem matches the ball; the follower valve stem is provided with an oil injection hole in the center, the oil injection hole is open at both ends, and the lower part of the oil injection hole is provided A plurality of drainage small holes, and the output end of the drainage small holes are connected to the outer peripheral wall of the lower end of the follow-up valve stem.

Preferably, the inlet of the flow passage is a circular hole, and the valve plug is a disc-shaped plug; the valve plug corresponds to the inlet of the flow channel up and down, and the block area of the upper part of the valve plug is The inlet of the runner is 1.3-1.6 times.

Preferably, the upper part of the upper mounting cavity is an upper valve cover, the lower end of the valve cover is connected to the valve body through a thread, and the first air pressure balance is located at the center of the upper valve cover.

Compared with the prior art, a pressure regulating valve adopting the above technical solution has the following beneficial effects:

First, when the rapid pressure changes, the lower end of the first bellows can be sealed and connected to the opening at the top of the flow channel, and the upper end of the first bellows is sealed and connected to the middle of the follower diaphragm to quickly and accurately make the opening. The degree of pre-reaction prevents changes in pressure fluctuations and failure at high frequencies.

2. By using a valve stem positioning device with a structure similar to a linear bearing, the friction of the following valve stem is reduced, and a bidirectional cone spring is combined to assist the positioning structure similar to a linear bearing to achieve precise guidance, the valve stem does not deflect, and moves axially. Less friction and increased spool feedback sensitivity. At the same time, due to the structure of the cone spring, the accommodating space of the positioning device is formed, so that the overall volume of the pressure regulating valve is small.

Third, through the pressure outlet between the fluid outlet and the fluid pressure balance chamber between the pressure balance branch between the two, and the pressure difference between the upper and lower follower diaphragm and the balance between the spring force, and finally achieve high-frequency pressure at the same time When the difference is changed, the opening degree is directly pre-feedbacked. The small opening degree is closed first and then opened. At the same time, the fluid pressure balance chamber is used to level the pressure difference. When the low-frequency pressure changes, only the pressure balance branch pipe and the fluid pressure balance chamber are activated, and the follow-up valve rod is driven to perform slow feedback and maintain constant pressure.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a three-dimensional structure according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of a three-dimensional structure according to an embodiment of the present invention.

FIG. 3 is a schematic cross-sectional structure diagram of an embodiment of the present invention.

FIG. 4 is an enlarged structural schematic diagram at A in FIG. 3 according to an embodiment of the present invention.

FIG. 5 is an enlarged structural schematic diagram at B in FIG. 4 according to an embodiment of the present invention.

detailed description

The invention is further described below with reference to the drawings.

Example:

As shown in Figures 1 to 5, a pressure regulating valve is an improvement on the existing pressure regulating valve, which fundamentally solves the problem of maintaining stability when the pressure changes in a short time. At the same time, in the prior art, problems such as guide friction caused by the valve core in order to simultaneously require the valve core positioning and the positioning process to limit the valve stem or the valve core are also solved. The change in the opening degree of the spool caused by these frictions will have unavoidable static friction, and the follow-up process of the pressure change needs an excessive force greater than the static friction to promote the real-time change of its internal opening degree. Therefore, this problem will essentially lead to voltage stabilization. Problems with low process sensitivity. In summary, the existing pressure regulator valve has technical problems that are difficult to overcome in terms of sensitivity and feedback hysteresis. The pressure regulating valve of this valve embodiment includes a valve body 1 and a pressure regulating valve core 2. Wherein, both ends of the valve body 1 include a fluid inlet portion 11 and a fluid outlet portion 12. The valve body 1 further includes a valve core mounting portion. The valve core mounting portion is located between the fluid inlet portion 11 and the fluid outlet portion 12. The valve core mounting portion is elongated and penetrates the upper and lower sides. The spool installation portion includes an upper installation cavity portion 1a, a lower installation cavity portion 1b, and a flow passage 1c that communicates the fluid inlet portion 11 and the fluid outlet portion 12, and accordingly, the spool 2 includes a first cone spring 21 and a follower diaphragm 22 , A first bellows 23, a follow-up valve stem 24, a spool plug 25, a second bellows 26 and a second cone spring 27.

Among them, the first cone spring 21, the follower diaphragm 22, and the first bellows 23 are located in the upper installation cavity portion 1a; the spool plug 25, the second bellows 26, and the second cone spring 27 are installed in the lower installation cavity portion 1b. on. The upper part of the follow-up valve rod 24 extends into the upper mounting cavity 1a, and the lower part is fixedly connected to the valve plug block 25 and extends into the lower mounting cavity 1b. The upper end of the first cone spring 21 is fixed on the top of the upper mounting cavity 1 a, and the lower end of the first cone spring 21 is connected to the middle of the follower diaphragm 22. The follower diaphragm 22 is sealed in the middle of the upper mounting cavity 1a, and the lower part of the follower diaphragm 22 and the outer part of the first bellows 23 form a fluid pressure balance chamber for the up and down movement of the follower diaphragm 22 13. The output end of the side of the flow channel 1c is connected to the fluid outlet portion 12, and a pressure equalization branch pipe 14 is provided between the fluid outlet portion and the fluid pressure balance cavity 13 between the two channels.

The upper end of the second corrugated tube 26 is sealed and fixedly connected to the valve core block 25, and the lower end of the second corrugated tube 26 is sealingly connected to the outer wall of the valve body 1 at the upper end of the lower mounting cavity 1b. The lower end of the second cone spring 27 is fixed to the bottom of the lower mounting cavity portion 1b, and the upper end is fixedly connected to the bottom of the valve plug block 25. The lower end of the first bellows 23 is hermetically connected to the top opening of the flow channel 1c, and the upper end of the first bellows 23 is hermetically connected to the middle of the follower diaphragm 22. The upper end of the follower valve stem 24 is fixedly connected to the center of the follower diaphragm 22, and the lower part of the follower valve stem 24 is fixedly connected to the middle of the valve core block 25 and the lower end thereof penetrates into the lower installation cavity 1b. That is, the above-mentioned pressure-stabilizing valve core 2 is located between the fluid inlet portion 11 and the fluid outlet portion 12. The pressure-stabilizing valve core 2 is normally open at all times, and its opening degree will follow the movement of the valve rod 24 to drive the valve core block 25, and the valve core The block 25 is between the inlet of the fluid inlet 11 and the inlet of the flow path 1c. Because the spool plug 25 can follow the follower valve stem 24 and move along the length of the follower valve stem 24, thereby changing the fluid output opening degree. Therefore, the above-mentioned follower valve rod 24 is fixedly connected in series with the upper follower diaphragm 22 and the lower valve core block 25.

In order to position and guide the follower valve rod 24, the follower valve rod 24 is preferably located at the center and moved axially. In the upper mounting cavity 1a, the inside of the first cone spring 21 is provided for the follower valve rod 24 to move up and down. Active upper positioning device 16. In the lower mounting cavity 1b, a lower positioning device 17 is provided in the second cone spring 27 for following the valve stem to move up and down. The upper positioning device 16 and the lower positioning device 17 have the same structure, and both include a fixed bracket 160 and a guide positioning ring 161. A ring 162 is provided in the guide positioning ring 161. The structure of the guide positioning ring 161 is similar to a linear bearing and a follower valve stem. The outer side of 24 replaces the shaft of the linear bearing. The follow-up valve stem 24 extends into the guide positioning ring 161 and loosely cooperates with the ball 162, thereby reducing the frictional force, and can successfully complete the positioning and guidance of the follow-up valve stem 24. In addition, relying on the good guidance of the first cone spring 21 and the second cone spring 27, the upper positioning device 16 and the lower positioning device are also provided with an accommodation space, so that the fixing bracket 160 and the guide positioning ring 161 are exactly embedded in the cone. The inside of the spring reduces the volume of the entire pressure regulator.

Further, a top of the upper mounting cavity portion 1 a is provided with a first air pressure balancing hole 18, and the first air pressure balancing 18 hole communicates with the mounting cavity above the follower diaphragm 22. The lower mounting cavity portion 1b is provided with a second air pressure balance hole 19, and the second air pressure balance 19 hole communicates with the inner cavity below the inside of the second bellows 26. The position below the first air pressure balancing hole 18 corresponds to the position where the following valve stem 24 matches the ball 162. An oil injection hole 240 is provided in the center of the follow-up valve stem 24, and both ends of the above-mentioned oil injection hole 240 are open. A plurality of drainage holes are provided at the lower part of the oil injection hole 240, and the output end of the drainage hole is connected to the lower end of the follow-up valve rod 24. Peripheral wall. The inlet of the flow channel 1c is a circular hole, and the plug block 25 is a disc-shaped block. The valve plug block 25 corresponds to the inlet of the flow channel 1c. The upper area of the valve plug block 25 is 1.3-1.6 times that of the inlet of the flow channel 1c. When the valve plug block 25 is larger than the inlet of the flow channel 1c, , Can reduce the opening error caused by the follow-up valve stem 24 offset from the axial direction.

In order to make the space of the upper mounting cavity 1a adjustable and adjust the elastic force of the first cone spring 21, the upper part of the upper mounting cavity 1a of this embodiment is an upper valve cover 1a1, and the lower end of the valve cover 1a1 is connected to the valve body 1 by threads. The first air pressure balance 18 is located at the center of the upper valve cover 1a1.

In use, the fluid flows in from the fluid inlet portion 11, passes between the plug block 25 and the inlet of the flow channel 1c, and then flows out from the fluid outlet portion 12. The outflow pressure fills the fluid pressure balance chamber 13 through the pressure balance branch pipe 14, so that the fluid The fluid pressure in the pressure balance chamber 13 is consistent with the fluid outlet 12. The lower end of the first corrugated tube 23 is hermetically connected to the top opening of the flow channel 1c, and the upper end of the first corrugated tube 23 is hermetically connected to the middle of the follower diaphragm 22. That is, the inside of the first bellows 23 is directly connected to the inlet of the flow channel 1c. Therefore, when the pressure is greater than the set value, the first bellows 23 will first expand and compress the first cone spring 21, and further, the pressure of the fluid outlet portion 12 also rises, and the fluid pressure balance chamber 13 is filled by the pressure balance branch pipe 14 When the fluid pressure balance chamber 13 is enlarged, the follower diaphragm 22 is larger than the outside atmospheric pressure, and the elastic force difference between the first cone spring 21 and the second cone spring 27 causes the follower diaphragm 22 to move up, and finally completes the follower valve stem. It moves up quickly and swiftly, which drives the plug block 25 to move up. Finally, the opening degree is reduced to reduce the pressure. When the impulse high pressure is coming, when the impulse high pressure is far greater than the set value, the first bellows 23 is pushed long, directly driving the follower valve stem 24 to move up, completing the opening degree reduction, and quickly feedback to reduce the pressure. At one time, the direct connection reasoning inside the first corrugated tube 23 is performed first, and then returned to the equilibrium fluid pressure balance chamber 13 to complete the sensitive voltage stabilization balance. Conversely, when the pressure is reduced, the opposite is also true.

In the description of the present invention, it should be understood that the terms "center", "portrait", "horizontal", "up", "down", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are merely for the convenience of describing the present invention and The simplified description does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation on the present invention. In addition, the terms “first”, “second”, and the like are used for descriptive purposes only, and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise stated, "a plurality" means two or more.

In the description of the present invention, it should be noted that the terms "installation", "connected", and "connected" should be understood in a broad sense unless otherwise specified and limited. For example, they may be fixed connections or removable. Connected or integrated; it can be mechanical or electrical; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

The above is a preferred embodiment of the present invention. For those of ordinary skill in the art, without departing from the principles of the present invention, several modifications and improvements can be made. These should also be regarded as the protection scope of the present invention.

It is obvious to a person skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, the embodiments are to be regarded as exemplary and non-limiting in every respect, and the scope of the present invention is defined by the appended claims rather than the above description, and therefore is intended to fall within the claims. All changes that are within the meaning and scope of equivalent elements are encompassed by the invention. Any reference signs in the claims should not be construed as limiting the claims involved.

In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment includes only an independent technical solution. This description of the specification is for clarity only, and those skilled in the art should take the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims

A pressure-stabilizing valve includes a valve body (1) and a pressure-stabilizing valve core (2). Both ends of the valve body (1) include a fluid inlet portion (11) and a fluid outlet portion (12); the pressure-regulating valve core (2) It is located between the fluid inlet portion (11) and the fluid outlet portion (12); it is characterized in that the valve body (1) further includes a valve core mounting portion;

The spool installation portion includes an upper installation cavity portion (1a), a lower installation cavity portion (1b), and a flow passage (1c) that communicates the fluid inlet portion (11) and the fluid outlet portion (12);

The spool (2) includes a first cone spring (21), a follower diaphragm (22), a first bellows (23), a follower stem (24), a spool plug (25), and a second bellows (26) and the second cone spring (27);

The first cone spring (21), the follower diaphragm (22), the first bellows (23) are located in the upper mounting cavity (1a), the valve core block (25), the second bellows (26), and the first Two cone springs (27) are mounted on the lower mounting cavity (1b);

The upper part of the follower valve stem (24) extends into the upper installation cavity (1a), and the lower part is fixedly connected to the valve plug and extends into the lower installation cavity (1b); the upper end of the second bellows (26) is sealed and fixedly connected The spool plug (25), the lower end of the second bellows (26) is sealingly connected to the outer wall opening of the valve body (1) at the upper end of the lower installation cavity (1b); the lower end of the second cone spring (27) is fixed to the lower installation cavity (1b) ), The upper end is fixedly connected to the bottom of the valve plug (25); the upper end of the first cone spring (21) is fixed to the top of the upper mounting cavity (1a), and the lower end of the first cone spring (21) is connected to the follower diaphragm ( 22) the middle;

The lower end of the first bellows (23) is hermetically connected to the top opening of the flow channel (1c), and the upper end of the first bellows (23) is hermetically connected to the middle of the follower diaphragm (22); the upper end of the follower valve stem (24) is fixed Connected to the center of the follower diaphragm (22), the lower part of the follower valve stem (24) is fixedly connected to the middle of the valve plug (25), and the lower end thereof penetrates into the lower installation cavity (1b);

The follower diaphragm (22) is sealed in the middle of the upper mounting cavity (1a), and the lower part of the follower diaphragm (22) and the outer part of the first bellows (23) constitute a part for the follower diaphragm. The fluid pressure balance chamber (13) moving up and down in the middle part; the output end of the side of the flow channel is connected to the fluid outlet part (12), and there are two links between the fluid outlet part and the fluid pressure balance cavity (13). Pressure equalizing branch pipe (14);

The spool plug (25) is between the inlet of the fluid inlet (11) and the inlet of the flow channel (1c). When the middle part of the follower diaphragm moves, the spool plug (25) can follow the follower The valve stem (24) is spring-moved along the length of the follower valve stem (24), thereby changing the fluid output opening degree.
The pressure stabilizing valve according to claim 1, characterized in that: in the upper mounting cavity (1a), an inner side of the first cone spring (21) is provided with an upper for moving the valve stem (24) up and down. Positioning device (16); in the lower mounting cavity (1b), the second cone spring (27) is provided with a lower positioning device (17) for up and down movement of the follow-up valve stem; an upper positioning device (16) and a lower positioning device (17) The structure is the same, and both include a fixed bracket (160) and a guide positioning ring (161). The guide positioning ring (161) is provided with a ring of balls (162); the follower valve stem (24) extends into the guide positioning ring ( 161) and fit loosely with the ball (162).
The pressure stabilizing valve according to claim 1, characterized in that: a first air pressure balancing hole (18) is provided on the top of the upper mounting cavity (1a), and the first air pressure balancing (18) hole communicates with the follower The mounting cavity above the moving diaphragm (22); the lower mounting cavity (1b) is provided with a second air pressure balancing hole (19), and the second air pressure balancing (19) hole communicates with the lower side of the inside of the second bellows (26) Lumen.
The pressure-stabilizing valve according to claim 3, characterized in that: the position below the first air pressure balancing hole (18) corresponds to the mating position of the follow-up valve stem (24) and the ball (162); An oil injection hole (240) is provided in the center of the follow-up valve stem (24), the oil injection hole (240) is open at both ends, and a plurality of drainage holes are provided at the lower part of the oil injection hole (240), and the output end of the drainage hole is connected to the valve The outer peripheral wall of the lower end of the moving valve rod (24).
The pressure stabilizing valve according to claim 1, characterized in that: the inlet of the flow channel (1c) is a circular hole, the valve plug (25) is a disc-shaped plug; and the valve plug (25) Corresponds to the upper and lower inlets of the flow channel (1c), and the blocking area of the upper part of the spool plug (25) is 1.3-1.6 times that of the inlet of the flow channel (1c).
The pressure stabilizing valve according to claim 1, characterized in that the upper part of the upper mounting cavity (1a) is an upper valve cover (1a1), and the lower end of the valve cover (1a1) is connected to the valve body (1) through threads, The first air pressure balance (18) is located at the center of the upper valve cover (1a1).