CN213451893U - Check valve - Google Patents

Abstract

The utility model provides a check valve, which comprises a valve seat, a valve clack, a first flow guide piece and a second flow guide piece which are assembled and fixed concentrically; the valve seat is provided with a bottom and a surrounding edge, the bottom is provided with a mounting hole, and the periphery of the mounting hole is provided with a plurality of water outlet holes; the valve clack is provided with a diaphragm and a mounting column, and the mounting column is fixedly arranged in the mounting hole in a penetrating way; the diaphragm covers the water outlet hole and elastically deforms towards the water outlet direction so that liquid flow can flow out of the check valve; the second flow guide part is attached to the first flow guide part and elastically deforms towards the water outlet direction, so that the liquid flow can flow into the check valve through the water through hole in the first flow guide part. The utility model discloses utilize the diaphragm and the elastic deformation at water hole border, make sealed vice have the effect of sealing in advance under the normality, with the help of the change of liquid stream effort to the elastic deformation state, realize the automatic opening and closing and the anti-return of valve.

Description

Check valve

Technical Field

The utility model belongs to the check valve field especially relates to a diaphragm cutting device, and the IPC is categorised to belong to F16K 7/12.

Background

The check valve is a valve which automatically prevents the medium from flowing backwards by the action of the medium through an opening and closing piece. Most of the existing check valves use springs to reset the opening and closing parts, such as the Chinese utility model patent CN211231721U, the technical scheme has the disadvantages that on one hand, the integral structure has too many parts, the assembly is inconvenient, and the production efficiency of the product is reduced; on the other hand, the spring is apt to rust or adhere foreign matter when it is immersed in fluid such as water for a long time, which deteriorates the performance of the spring and lowers the reliability of the product.

With regard to terms and knowledge, see, except as specified in this specification, the "IEC electronic and Electrical Standard terminology dictionary" (1 st edition of Chinese Standard Press 1992), "Electrical apparatus manufacturing technology" (1 st edition of mechanical industry Press 1982), "mechanical engineering Manual", and "Motor engineering Manual" (1 st edition of mechanical industry Press 1978 and 2 nd edition of 1997), and the national Standard GB/T21465-2008 "valve terminology".

Disclosure of Invention

The utility model discloses the required technical problem who solves is, simplifies the structure of opening and close piece, realizes the automatic switching of valve, prevents the medium backward flow simultaneously. The utility model adopts the following technical scheme:

a check valve comprising a valve seat 10, a valve flap 20, a first flow guide 30 and a second flow guide 40 which are concentrically fitted and fixed;

the valve seat 10 is provided with a bottom 11 and a surrounding edge 12 surrounding the periphery of the bottom 11, the bottom 11 is provided with a mounting hole 111 in the center, and a plurality of water outlet holes 112 are circumferentially formed in the periphery of the mounting hole 111;

the valve flap 20 is provided with a diaphragm 21 and a mounting column 22 formed by axially extending on one side of the diaphragm 21, and the mounting column 22 is fixedly arranged in the mounting hole 111 in a penetrating way; the membrane 21 covers the water outlet hole 112 and is attached to one side of the bottom 11 facing the water outlet direction to elastically deform towards the water outlet direction so that the liquid flow can flow out of the check valve;

the periphery of the first flow guide element 30 is limited and fixed with the surrounding edge 12, so that the second flow guide element 40 and the first flow guide element 30 are sequentially assembled on one side of the bottom 11 facing the water inlet direction; an annular convex rib 321 is arranged on one side of the first flow guide member 30 facing the water outlet direction, and a water inlet hole 34 is formed in the periphery of the annular convex rib 321; the second guide member 40 forms an annular membrane 43 in the middle and is attached to the annular rib 321 to elastically deform toward the outlet direction so that the liquid can flow into the check valve through the water hole 44 formed in the center of the annular membrane 43.

Preferably, the membrane 21 is attached to the side of the bottom 11 facing the water outlet direction in an elastically deformed state, and pressure is applied to the bottom 11 to achieve pre-sealing of the membrane 21 and the bottom 11.

Preferably, the annular membrane 43 is fitted to the annular rib 321 in a state of being elastically deformed by the pressure applied by the annular rib 321, so as to realize the pre-sealing of the annular membrane 43 and the annular rib 321.

Specifically, the mounting post 22 is provided with a cap-shaped end, and the mounting post 22 passes through the mounting hole 111 through the cap-shaped end in an interference manner to be clamped and fixed in the mounting hole 111.

Specifically, the inner wall of surrounding edge 12 opening border is radial protruding inwards and forms cyclic annular screens 121 to with the periphery joint of first water conservancy diversion spare 30 with spacing fixed first water conservancy diversion spare 30, in order to realize first water conservancy diversion spare 30 towards the one side of water inflow direction with surrounding edge 12 is spacing fixed.

Specifically, an annular boss 116 is formed by protruding the bottom 11 at the periphery of the water outlet 112 towards one side of the water inlet direction, and a groove 117 is formed between the annular boss 116 and the surrounding edge 12; the outer edge of the second flow guide element 40 protrudes to form a flange 41, and the size of the flange 41 is adapted to the groove 117, so that the flange 41 is fitted in the groove 117, and the valve seat 10 and the second flow guide element 40 are assembled and sealed.

Specifically, the water outlet holes 112 have connecting ribs 114 arranged at the periphery of the mounting hole 111 in a radial and circumferential direction, and the connecting ribs 114 protrude at one end close to the mounting hole 111 to form a plate-shaped boss 115; the plate-shaped boss 115 is in contact with the first baffle 30.

Specifically, the outer diameter of the skirt 12 gradually increases in the opening direction.

The utility model discloses following beneficial effect has:

(1) the arrangement of the two-stage sealing pair buffers the flow velocity of the liquid, avoids the situation that the diaphragm 21 cannot be well reset due to elastic fatigue caused by long-term action in a high water pressure state, improves the use reliability of the check valve, and reduces the maintenance cost of the check valve.

(2) By utilizing the elastic deformation of the diaphragm 21 and the annular diaphragm 43, the sealing pair has a pre-sealing effect under a normal state, and the automatic opening and closing and backflow prevention of the valve are realized by means of the change of the liquid flow acting force on the elastic deformation state.

(3) The second flow guide part 40 is clamped between the valve seat 10 and the first flow guide part 30, and the sealing effect is enhanced by the liquid flow impact received by the first flow guide part 30; the plate-shaped boss 115 has a supporting and limiting effect on the first flow guide member 30, and prevents the first flow guide member 30 from being dislocated or damaged due to liquid flow impact.

(4) The outer diameter of the surrounding edge 12 is gradually increased along the opening direction, so that the check valve can be simply clamped and assembled in a pipeline, and the assembly efficiency is improved.

Drawings

FIG. 1 is a sectional view of a check valve of the present invention in a normal state, as applied to a solenoid valve;

FIG. 2 is a cross-sectional view of area A of FIG. 1;

FIG. 3 is a cross-sectional view of the check valve of the present invention in a forward flow state of the fluid flow;

FIG. 4 is a front view of the check valve seat of the present invention;

FIG. 5 is a perspective view of the check valve seat of the present invention;

fig. 6 is an axial assembly schematic of the check valve of the present invention.

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

For simplicity of description, the present specification defines the following orientations: the valve seat 10, the valve flap 20, the first guide element 30 and the second guide element 40 are arranged such that, when the check valve is open, the side facing the flow is the front side of each valve seat, while the opposite side is the rear side. As shown in fig. 1, the present embodiment provides a check valve, which is installed in a water inlet pipe 50 of a solenoid valve, and includes a valve seat 10, a valve flap 20, a first guide member 30, and a second guide member 40.

As shown in fig. 2, the valve seat 10 is a bowl-shaped plastic member, and is divided into a bottom 11 and a peripheral edge 12 axially extending from the front edge of the bottom 11.

As shown in fig. 2, 4 and 5, the bottom 11 has a circular mounting hole 111 at the center for fixedly connecting the valve seat 10 and the valve flap 20. The bottom 11 is provided with a plurality of outlet holes 112 (shown by a dashed box at the back of the bottom 11 in fig. 2) at the periphery of the mounting hole 111 for discharging water from the check valve, and the outlet holes 112 may be designed in a triangular shape, a fan shape, a circular shape, or the like, and are preferably arranged at the periphery of the mounting hole 111 in a radial circumferential direction. The peripheral wall of the mounting hole 111 is a central ring 113, and is structurally connected with the bottom 11 body through a connecting rib 114 between the water outlet holes 112; the front surface of each connecting rib 114 is protruded to form a plate-shaped boss 115 with the same height at one end close to the central ring 113. On the front surface of the bottom 11, the peripheral area of the water outlet hole 112 is provided with an annular protrusion to form an annular boss 116, a groove 117 is formed between the annular boss 116 and the surrounding edge 12, and the groove 117 is used for mounting and fixing the valve seat 10 and the second flow guide element 40.

As shown in fig. 1 and 2, the outer diameter of the surrounding edge 12 gradually increases along the front extension direction of the bottom 11, and is clamped in the inner wall of the water inlet pipe 50, so as to realize the installation and fixation of the valve seat 10 and the water inlet pipe 50; the inner wall of the opening edge of the surrounding edge 12 protrudes radially to the axis to form an annular clamping position 121 for mounting and fixing the valve seat 10 and the first flow guiding element 30.

As shown in fig. 2, the valve flap 20 is a rubber opening and closing member, and is divided into two parts, namely a diaphragm 21 and a mounting post 22 axially extending from the center of the front surface of the diaphragm 21.

As shown in fig. 2, 4 and 6, the shaft of the mounting post 22 is inserted into the mounting hole 111, and the diameter of the shaft is adapted to the aperture of the mounting hole 111; the end 221 of the mounting column 22 is in a cap shape, the maximum diameter of the mounting column is slightly larger than the aperture, the mounting column penetrates through the mounting hole 111 in an interference mode, and the mounting column is clamped on the front face of the central ring 113 where the mounting hole 111 is located, so that the mounting and fixing of the valve clack 20 and the valve seat 10 are realized.

The membrane 21 is disc-shaped, and the front surface is concave under normal conditions, and is buckled on the back surface of the bottom 11, and completely covers all the water outlet holes 112; the outer edge of the front surface of the diaphragm 21 is elastically deformed to be closely attached to the back surface of the bottom 11, and the two parts form a pair of sealing pairs.

As shown in fig. 2 and 6, the second flow guiding element 40 is an annular rubber ring, the back surface of the second flow guiding element is protruded to form a flange 41, and the height and width of the flange 41 are adapted to the depth and width of the groove 117 between the annular boss 116 and the surrounding edge 12, so that the flange 41 is fitted in the groove 117, and the valve seat 10 and the second flow guiding element 40 are fixed. The material of the middle area of the front surface 42 of the second flow guide element 40 is thinned to form an annular membrane 43, a circular water through hole 44 is formed in the center of the annular membrane 43, the inner diameter of the water through hole 44 is larger than the diameter of the outer edge of the plate-shaped boss 115, and an annular gap is reserved between the water through hole and the plate-shaped boss 115. In other variants, it is also possible for the front face 42 of the second baffle 40 to extend directly centrally to form the annular membrane 43 without thinning.

As shown in fig. 2 and 6, the first baffle member 30 is a wheel-shaped plastic plate having an outer ring 31, an inner ring 32, and a connecting post 33 connecting the outer ring 31 and the inner ring 32.

The outer ring 31 is of an annular plane structure, the back surface of the outer ring is tightly attached to the front surface 42 of the second flow guide element 40, and the outer edge of the front surface of the outer ring is clamped in the annular clamping position 121 on the inner wall of the surrounding edge 12, so that the front surface of the first flow guide element 30 is limited, mounted and fixed with the valve seat 10, and the second flow guide element 40 is also pressed tightly to play a sealing role.

The inner ring 32 is a circular plate-shaped structure, the diameter of the inner ring is larger than the diameter of the water through hole 44 at the center of the second flow guide member 40, and the outer edge of the back of the inner ring 32 is protruded to form an annular rib 321. The annular rib 321 is clamped in the annular gap between the water passing hole 44 and the plate-shaped boss 115, and presses the annular membrane 43 to generate elastic deformation, so that the area of the front surface of the annular membrane 43 adjacent to the water passing hole is normally, namely the front edge 441 of the annular membrane is tightly attached to the annular rib 321, and the annular rib form a pair of sealing pairs. The back of the inner ring 32 contacts with the plate-shaped boss 115 at the inner periphery of the annular convex rib 321, so that the back of the first flow guide part 30 is limited, mounted and fixed with the valve seat 10. The hollow part between the outer ring 31 and the inner ring 32 is a water inlet 34, and the water inlet 34 can be designed into a fan shape, a circular shape and the like and is arranged around the inner ring 32.

As shown in fig. 1 and 2, the check valve provided in this embodiment is formed by concentrically assembling a valve seat 10, a valve flap 20, a first diversion member 30, and a second diversion member 40, and is placed in a water inlet pipe 50 of the solenoid valve, and the mounting and fixing of the check valve in the water inlet pipe 50 are realized by clamping and connecting a surrounding edge 12 with the inner wall of the water inlet pipe 50.

When the liquid flow enters the water inlet pipeline 50 of the electromagnetic valve, the liquid flow is dispersed into a plurality of liquid flows through the water inlet holes 34 and flows into the check valve, the inner ring 32 bears the frontal impact of the liquid flow, the compression effect of the first flow guide piece 30 on the second flow guide piece 40 is enhanced through the transmission of force, the second flow guide piece 40 is more tightly attached between the valve seat 10 and the first flow guide piece 30, and the sealing performance is further enhanced. In addition, the water inlet holes 34 disperse the liquid flow and play a role in buffering.

As shown in fig. 3, when the liquid flows through the inlet hole 34 and is collected on the annular membrane 43 again, the elastic deformation of the annular membrane 43 is increased under the action of water pressure, and the front edge 441 of the annular membrane leaves the annular rib 321, so that the sealing pair formed by the two is opened to conduct the liquid flow. The liquid flow continuously presses the annular diaphragm 43 and overcomes the elastic force of the annular diaphragm 43, so that flow loss is generated, and the effect of buffer liquid flow is further enhanced.

Finally, when the liquid flow is collected on the front surface of the diaphragm 21 through the water outlet hole 112, the elastic deformation of the diaphragm 21 is increased under the action of water pressure, and the front edge of the diaphragm 21 leaves the back surface of the bottom 11 of the valve seat 10, so that the sealing pair formed by the diaphragm and the back edge is opened, and the liquid flow flows out of the check valve. The liquid flow buffering of the first flow guide member 30 and the second flow guide member 40 reduces the water pressure borne by the diaphragm 21, and prevents the diaphragm 21 from elastic fatigue and failure of good reset due to long-term operation in a high water pressure state.

When the inlet conduit 50 of the solenoid valve stops supplying fluid, fluid flow is reversed to the check valve. The back of the diaphragm 21 is under the action of larger water pressure, the front of the diaphragm is under the action of smaller air pressure, under the action of larger pressure difference between the back and the front of the diaphragm 21, the diaphragm 21 is elastically deformed, so that the front edge of the diaphragm 21 is pressed on the back of the bottom 11 of the valve seat 10, the area of the front edge of the pressed diaphragm 21 is increased, namely the area of a sealing surface is increased, the sealing performance of a sealing pair formed by the front edge of the diaphragm 21 and the back of the bottom 11 of the valve seat 10 is further enhanced, and liquid flow is prevented from flowing backwards into the check.

Even when the liquid flow reversely flows into the check valve through the water outlet 112 due to the abnormality of the diaphragm 21, the back surface of the second flow guiding member 40 is subjected to a large water pressure, the front surface of the second flow guiding member 40 is subjected to a small air pressure, and under the action of a large pressure difference between the back surface and the front surface, the second flow guiding member 40 is elastically deformed so that the front surface edge 441 of the annular diaphragm is pressed on the annular rib 321, the area of the front surface edge 441 of the pressed annular diaphragm is increased, that is, the area of the sealing surface is increased, the sealing performance of a sealing pair formed by the front surface edge 441 of the annular diaphragm and the annular rib 321 is further enhanced, and the liquid flow is prevented from flowing backwards.

The check valve is provided with two sealing pairs at the water inlet end and the water outlet end, under the condition that liquid flow flows in the forward direction, the liquid flow is buffered by virtue of the pre-sealing effect of elastic deformation of the two rubber pieces of the diaphragm 21 and the second flow guide piece 40 under the normal state, the loss of parts is reduced, the service life is prolonged, the maintenance cost of the check valve is reduced, and the use reliability of the check valve is improved; under the condition that liquid flow reversely flows, pressure difference is formed at two ends of the rubber part by means of the water pressure of the reverse liquid flow, the closing sealing effect of the sealing pair is enhanced, the liquid flow is prevented from flowing backwards, and the one-way conduction of the liquid flow of the pipeline is realized.

During operation of the check valve, the diaphragm 21 has three states of elastic deformation. In a normal state, that is, under the condition that no liquid flows exist at both ends of the check valve, the diaphragm 21 is close to the bottom 11 of the valve seat 10 due to the clamping connection relationship between the mounting column 22 and the mounting hole 111, and is elastically deformed, the front edge of the diaphragm 21 is pressed to the back of the bottom 11 of the valve seat 10 under the action of restoring force, and forms a pair of sealing pairs with the back of the bottom 11 of the valve seat 10, at this time, the check valve is not conducted, and the pre-sealing effect is achieved.

Under the condition that the liquid flow flows in the forward direction, the water pressure acts on the front surface of the diaphragm 21, the restoring force of the diaphragm 21 in a normal state is overcome, the diaphragm 21 is elastically deformed, the edge of the front surface of the diaphragm 21 is far away from the bottom 11 of the valve seat 10, at the moment, the sealing pair is opened, the check valve is conducted, and the effect of conducting the liquid flow is achieved.

Under the condition that the liquid flow reversely flows, the water pressure acts on the back surface of the diaphragm 21, the acting force of the water pressure is superposed with the restoring force direction of the diaphragm 21 in a normal state, the diaphragm 21 is elastically deformed, the front edge of the diaphragm 21 is more tightly attached to the back surface of the bottom 11 of the valve seat 10, the sealing surface area is increased at the moment, the sealing effect of the sealing pair is enhanced, the check valve is not conducted, and the backflow preventing effect is achieved.

Similarly, the second flow guide member 40 has three elastically deformed states during the operation of the check valve. In a normal state, that is, under the condition that no liquid exists at both ends of the check valve, the front edge 441 of the annular diaphragm elastically deforms under the action of pressure applied by the annular rib 321 due to the position matching relationship between the second flow guiding member 40 and the first flow guiding member 30, and is close to the annular rib 321 under the action of restoring force to form another pair of sealing pairs with the annular rib 321, and at this time, the check valve is not conducted, and the pre-sealing effect is also achieved.

Under the condition that the liquid flow flows in the forward direction, the water pressure acts on the annular membrane 43, the restoring force of the front edge 441 of the annular membrane under the normal state is overcome, the front edge 441 of the annular membrane is elastically deformed to be far away from the annular convex rib 321, at the moment, the sealing pair is opened, the check valve is conducted, and the effect of conducting the liquid flow is achieved.

Under the condition that the liquid flow reversely flows, if the liquid flow breaks through the sealing between the front edge of the membrane 21 and the back surface of the bottom 11 of the valve seat 10 and reaches the check valve, water pressure acts on the back surface of the second flow guide part 40, the acting force of the water pressure is overlapped with the restoring force direction of the front edge 441 of the annular membrane in the normal state, so that the second flow guide part 40 is elastically deformed, the front edge 441 of the annular membrane is tightly attached to the annular convex rib 321, the area of the sealing surface is increased at the moment, the sealing effect of the sealing pair is enhanced, the check valve is not conducted, and the backflow preventing effect is.

The utility model provides a check valve not only is applicable to the solenoid valve inlet channel, still is applicable to other one-way conduction liquid flows such as the inlet channel of pump and the outlet conduit of outlet conduit, valve, prevents the pipeline of backward flow.

Claims (8)

1. A check valve, characterized by comprising a valve seat (10), a valve flap (20), a first flow guide (30) and a second flow guide (40) which are concentrically assembled and fixed;

the valve seat (10) is provided with a bottom (11) and a surrounding edge (12) surrounding the periphery of the bottom (11), the bottom (11) is provided with a mounting hole (111) in the center, and a plurality of water outlet holes (112) are formed in the periphery of the mounting hole (111) in the circumferential direction;

the valve flap (20) is provided with a diaphragm (21) and a mounting column (22) formed by axially extending on one side of the diaphragm (21), and the mounting column (22) is fixedly arranged in the mounting hole (111) in a penetrating way; the diaphragm (21) covers the water outlet hole (112) and is attached to one side of the bottom (11) facing the water outlet direction to elastically deform towards the water outlet direction so that liquid flow can flow out of the check valve;

the outer edge of the first flow guide part (30) is limited and fixed with the surrounding edge (12) so that the second flow guide part (40) and the first flow guide part (30) are sequentially assembled on one side of the bottom (11) facing the water inlet direction; one side of the first flow guide piece (30) facing the water outlet direction is provided with an annular convex rib (321), and the periphery of the annular convex rib (321) is provided with a water inlet hole (34); an annular membrane (43) is formed in the middle of the second flow guide piece (40) and is attached to the annular convex rib (321) to elastically deform towards the water outlet direction, so that liquid flow can flow into the check valve through a water through hole (44) formed in the center of the annular membrane (43).

2. Non-return valve according to claim 1, characterized in that the membrane (21) is fitted in an elastically deformed state against the side of the bottom (11) facing in the direction of the water outlet, and that pressure is applied to the bottom (11) to achieve a pre-sealing of the membrane (21) and the bottom (11).

3. Non-return valve according to claim 1 or 2, characterized in that the annular membrane (43) is conformed to the annular bead (321) in a state of elastic deformation under the pressure exerted by the annular bead (321) to achieve the pre-sealing of the annular membrane (43) and the annular bead (321).

4. The non-return valve in accordance with claim 1, characterized in that the mounting post (22) is provided with a cap-shaped end, by means of which the mounting post (22) is snap-fastened through a mounting hole (111) to the mounting hole (111).

5. The non-return valve according to claim 1, characterized in that the inner wall of the opening edge of the surrounding edge (12) is protruded radially inwards to form an annular clamping position (121) and clamped with the periphery of the first flow guiding element (30) to limit and fix the first flow guiding element (30).

6. The non-return valve according to claim 1 or claim, characterized in that the side of the bottom (11) facing the water inlet direction is raised to form an annular boss (116) at the periphery of the water outlet hole (112), and a groove (117) is formed between the annular boss (116) and the surrounding edge (12); the outer edge of the second flow guide part (40) protrudes to form a flange (41), the size of the flange (41) is matched with that of the groove (117), so that the flange (41) is installed in the groove (117) in a fitting mode, and the valve seat (10) and the second flow guide part (40) are assembled and sealed.

7. The check valve according to claim 1, characterized in that the water outlet holes (112) are provided with connecting ribs (114) arranged at the periphery of the mounting hole (111) in a radial and circumferential direction, and the connecting ribs (114) are protruded to form a plate-shaped boss (115) at one end close to the mounting hole (111); the plate-shaped projection (115) is in contact with the first flow guide (30).

8. Non-return valve according to claim 1, characterized in that the outer diameter of the skirt (12) increases gradually in the opening direction.

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