CN219317708U - Filter backflow prevention valve - Google Patents

Abstract

The utility model provides a filtering backflow prevention valve, and belongs to the technical field of valves. It has solved the not good problem of anti-backflow effect. The novel check valve comprises a valve body, wherein the left end of the valve body is provided with a water inlet channel, the right end of the valve body is provided with a water outlet channel, a filter screen is arranged in the filter channel, a first check component is arranged in the water outlet channel, a second check component is arranged in the water inlet channel, an annular clamping groove I is arranged in the water outlet channel, the first check component comprises a first shell provided with an elastic clamping part I positioned in the clamping groove I and a first check core which is arranged in the first shell and is used for realizing a check function, the second annular clamping groove I is arranged in the water inlet channel, the second check component comprises a second shell provided with an elastic clamping part II positioned in the second clamping groove I and a second check core which is arranged in the second shell and is used for realizing the check function, and the first check core and the second check core have the same check direction. The anti-backflow device has the advantages of good anti-backflow effect, convenience in assembly and the like.

Description

Filter backflow prevention valve

Technical Field

The utility model belongs to the technical field of valves, and relates to a filtering backflow prevention valve.

Background

With the continuous development of urban design, in the existing water supply network, in order to ensure the water quality of the user side, a filter valve is generally used. The filter valve comprises a valve body with a water inlet channel and a water outlet channel, a filter channel which is simultaneously communicated with the water inlet channel and the water outlet channel is arranged in the valve body, a filter screen is arranged in the filter channel, and the filter screen can filter granular impurities such as sand and stone in a flowing medium. In addition, in order to ensure the water supply stability of the water supply network, a check valve is also arranged for preventing the medium in the rear end pipeline of the water outlet channel from flowing backwards. However, the combined use of various valves has the defects of high cost, large volume, long connection length and the like.

For this reason, a check assembly is integrated in the water outlet channel of the filter valve, which combines the functions of filtering and preventing backflow, to form a filter backflow prevention valve, such as an anti-interference check valve with the filtering function disclosed in patent application No. 202023110455.9. However, it has been found in practice that the backflow preventing effect achieved by such a single check structure is not ideal, on the one hand, because it takes a certain time for the check assembly to reform the check when the water inlet channel front end pipe is closed, that is, it is ineffective in a short time period; on the other hand, after the check assembly is damaged, the backflow preventing function is completely disabled.

Disclosure of Invention

The utility model aims to solve the problems in the prior art, and provides a backflow filtering prevention valve which solves the problem of poor backflow prevention effect.

The aim of the utility model can be achieved by the following technical scheme:

the valve body is provided with a water inlet channel at the left end and a water outlet channel at the right end, the water inlet channel is arranged on the same central line as the water outlet channel or is parallel to the water outlet channel, a filter screen is arranged in the filter channel, a first check component is arranged in the water outlet channel, the valve body is provided with a second check component in the water outlet channel, the water outlet channel is internally provided with a first annular clamping groove, the first check component comprises a first shell, the outer side of the first shell is provided with a first elastic clamping part, the first check component is provided with a second check core, the first elastic clamping part is arranged in the first shell, the second check core is used for realizing the check function, the outer side of the second check component is provided with a second shell, the second elastic clamping part is arranged in the second shell, the second check core is used for realizing the check function, and the check direction of the first check core is identical with the check core.

On the basis of the first check component, the second check component is additionally arranged to form a double check structure, and the second check component can still play a role in preventing the medium from flowing back into the front end pipeline of the water inlet end when the first check component fails. And the first check component and the second check component are respectively positioned in the water outlet channel and the water inlet channel, the distance between the first check component and the second check component is relatively far, and the filter channel obliquely arranged relative to the water inlet channel is also arranged, and meanwhile, the filter screen can also form certain resistance to the medium flowing backwards, so that the second check component is sufficiently time to form closing on the basis that the medium flowing backwards is relatively tortuous. Through the arrangement, the backflow preventing effect is greatly improved.

In addition, the first check assembly comprises a first shell with an elastic clamping part I positioned in a clamping groove I at the outer side and a first check core which is arranged in the first shell and can realize a check function, an annular clamping groove I is arranged in the water outlet channel, the second check assembly comprises a second shell with an elastic clamping part II positioned in the clamping groove II at the outer side and a second check core which is arranged in the second shell and can realize the check function, and an annular clamping groove II is arranged in the water inlet channel, so that the first check assembly and the second check assembly can be installed and fixed in a valve body in a modularized mode (the first check assembly can be installed and fixed in the water outlet channel only by clamping the first elastic clamping part of the first shell into the clamping groove I, and the second check assembly can be installed and fixed in the water inlet channel only by clamping the second elastic clamping part of the second shell into the clamping groove II), and the convenience of assembly is improved.

In the above-mentioned filtration backflow prevention valve, the outlet channel has a first shoulder, the left end of the housing abuts against the first shoulder, the inlet channel has a second shoulder, and the right end of the housing abuts against the second shoulder.

The first convex shoulder is arranged in the water outlet channel, and can be used for blocking the first shell, so that the first elastic clamping part can be clamped with the first clamping groove in place. Through setting up the convex shoulder two in the water inlet channel, utilize convex shoulder two to block second shell, ensure that elasticity joint portion two can with draw-in groove two joint in place.

In the above-mentioned filtration backflow prevention valve, the first elastic clamping part comprises a plurality of elastic clamping pieces uniformly distributed along the circumferential direction, the left end of each elastic clamping piece is fixedly connected with the first shell, and the right end of each elastic clamping piece is inclined towards the direction away from the central line of the first shell and positioned in the first clamping groove.

When the first check component is plugged into the water outlet channel from right to left, the first elastic cards are limited by the inner wall of the water outlet channel and shrink inwards, and when the first check component moves to the first elastic cards at the first clamping groove, the first elastic cards reset under the action of self elasticity and are clamped into the first clamping groove, so that the first check component is fixed in the water outlet channel.

In the above-mentioned filtration backflow prevention valve, the first shell comprises a right half body, a left half body which is annular, and a plurality of connecting pieces which are distributed along the circumferential direction and are fixedly connected with the right half body and the left half body simultaneously, the first elastic clamping pieces are positioned at the right end of the left half body, the first check core comprises a first valve core which is connected in the right half body in a sliding way and a first check spring which acts on the first valve core, and the first valve core can extend into the first left half body to seal the first valve core under the action of the first check spring.

In the state of no water inflow, the elastic force of the first check spring acts on the first valve core to enable the first check spring to be positioned in the first left half body to form a blocking. When water is fed, the water inlet pressure pushes the valve core I to overcome the action of the check spring I so as to open the left half body I.

In the above-mentioned filtration backflow prevention valve, the second elastic clamping part comprises a plurality of second elastic clamping pieces uniformly distributed along the circumferential direction, the left end of each second elastic clamping piece is fixedly connected with the second shell, and the right end of each second elastic clamping piece is inclined towards the direction away from the center line of the second shell and positioned in the second clamping groove.

When the second check component is plugged into the water inlet channel from left to right, the second elastic cards are limited by the inner wall of the water inlet channel and shrink inwards, and when the second check component moves to the second elastic cards at the second clamping groove, the second elastic cards reset under the action of self elasticity and are clamped into the second clamping groove, so that the second check component is fixed in the water inlet channel.

In the above-mentioned filtration backflow prevention valve, the second shell comprises a second right half body, a second left half body which is annular and a plurality of second connecting sheets which are distributed along the circumferential direction and are fixedly connected with the second right half body and the second left half body simultaneously, the second elastic clamping sheets are positioned at the right end of the second left half body, the second check core comprises a second valve core which is connected in the second right half body in a sliding manner and a second check spring which acts on the second valve core, and the second valve core can extend into the second left half body to seal the second valve core under the action of the second check spring.

In the state of no water inflow, the elastic force of the second check spring acts on the second valve core to enable the second check spring to be positioned in the second left half body to form a blocking. When water is fed, the water inlet pressure pushes the valve core II to overcome the action of the check spring II so as to open the left half body II.

In the above-mentioned filtration backflow prevention valve, the water outlet end has an external thread, the water inlet end is sleeved with a loose joint nut, and the outside of the water inlet end is provided with a snap spring capable of preventing the loose joint nut from separating from the water inlet end.

Through the arrangement, the conversion connection of the internal thread and the external thread can be realized. Meanwhile, the loose joint nut can realize the loose joint function.

In the above-mentioned filtration backflow prevention valve, as another technical scheme, the water inlet end has external screw thread, the water outlet end overcoat is equipped with the loose joint nut, the water outlet end outside is equipped with the jump ring that can prevent that the loose joint nut breaks away from the water outlet end.

Compared with the prior art, the filtering backflow prevention valve is additionally provided with the second check component on the basis of the first check component, a double check structure is formed, the second check component can still play a role in preventing media from flowing back into the front end pipeline of the water inlet end when the first check component fails, the first check component and the second check component are respectively positioned in the water outlet channel and the water inlet channel, the distance between the first check component and the second check component is far, the filtering channel which is obliquely arranged relative to the water inlet channel is further arranged, and meanwhile, the filtering screen can form certain resistance to media flowing back, so that the second check component is sufficiently time to form closing on the basis that a media backflow path is relatively tortuous, and the backflow prevention effect is greatly improved.

Drawings

Fig. 1 is a cross-sectional view of a first embodiment of the present filter backflow prevention valve.

Fig. 2 is an enlarged cross-sectional view of the first stop assembly of fig. 1.

Fig. 3 is a schematic structural view of the first check assembly.

Fig. 4 is an enlarged cross-sectional view of the second stop assembly of fig. 1.

Fig. 5 is a schematic structural view of a second check assembly.

In the figure, 1, a valve body; 1a, a water inlet channel; 1b, a water outlet channel; 1c, a filtering channel; 1d, clamping groove I; 1e, a first shoulder; 1f, clamping groove II; 1g, a second shoulder; 2. a filter screen; 3. a first check assembly; 3a, a first shell; 3a1, an elastic clamping part I; 3a11, an elastic card I; 3a2, left half; 3a3, right half one; 3a31, column part one; 3a4, connecting piece one; 3b, a first check core; 3b1, valve core one; 3b11, first rod portion; 3b12, head one; 3b2, check spring one; 3c, a first sealing gasket; 4. a second check assembly; 4a, a second shell; 4a1, an elastic clamping part II; 4a11, an elastic card II; 4a2, left half; 4a3, right half; 4a31, second columnar portion; 4a4, a second connecting sheet; 4b, a second check core; 4b1, a valve core II; 4b11, a second rod part; 4b12, head two; 4b2, a second check spring; 4c, a second sealing gasket; 5. a loose joint nut; 6. clamping springs; 7. and (5) plugging the cover.

Detailed Description

The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.

Example 1

As shown in fig. 1, the filter backflow preventing valve comprises a valve body 1 having a water inlet channel 1a at the left end and a water outlet channel 1b at the right end, wherein the water inlet channel 1a and the water outlet channel 1b are arranged on or parallel to each other, and in this embodiment, the water inlet channel 1a and the water outlet channel 1b are arranged on or parallel to each other. The water outlet end is provided with an external thread, the water inlet end is sleeved with a loose joint screw cap 5, and the outer side of the water inlet end is provided with a clamp spring 6 which can prevent the loose joint screw cap 5 from separating from the water inlet end. The valve body 1 is also internally provided with a filtering channel 1c which is obliquely arranged relative to the water inlet channel 1a, the water inlet channel 1a and the water outlet channel 1b are simultaneously communicated with the filtering channel 1c, wherein the right end of the water inlet channel 1a is communicated with the filtering channel 1c, and the left end of the water outlet channel 1b is laterally communicated with the filtering channel 1 c. The filter screen 2 is arranged in the filter channel 1c, and the plug cover 7 is connected with the external thread of the valve body 1 where the port of the filter channel 1c is positioned.

Further, as shown in fig. 1, 2 and 3, a check assembly one 3 is disposed in the water outlet channel 1b, a circular clamping groove one 1d is disposed in the water outlet channel 1b, and the check assembly one 3 includes a housing one 3a having an elastic clamping portion one 3a1 disposed in the clamping groove one 1d on the outer side and a check core one 3b disposed in the housing one 3a for realizing the check function. The water outlet channel 1b is internally provided with a convex shoulder 1e, and the left end of the shell 3a is propped against the convex shoulder 1 e. The first elastic clamping part 3a1 comprises a plurality of first elastic clamping pieces 3a11 which are uniformly distributed along the circumferential direction, the left end of each first elastic clamping piece 3a11 is fixedly connected with the first shell 3a, and the right end of each first elastic clamping piece 3a11 is inclined towards the direction far away from the central line of the first shell 3a at the left end and is positioned in the first clamping groove 1 d. The first shell 3a comprises a first right half body 3a3, a first left half body 3a2 which is annular and a plurality of connecting pieces 3a4 which are distributed along the circumferential direction and are fixedly connected with the first right half body 3a3 and the first left half body 3a2 at the same time, each elastic card 3a11 is positioned at the right end of the first left half body 3a2, the outer diameter of the first right half body 3a3 is smaller than the outer diameter of the first left half body 3a2, and the outer diameter of the first right half body 3a3 has taper. The check core I3 b comprises a valve core I3 b1 which is connected in the right half body I3 a3 in a sliding way and a check spring I3 b2 which acts on the valve core I3 b1, and the valve core I3 b1 can extend into the left half body I3 a2 to seal the valve under the action of the check spring I3 b 2. Specifically, the center of the right half body 3a3 is provided with a column part 3a31, the valve core 3b1 comprises a rod part 3b11 penetrating through the column part 3a31 and a head part 3b12 fixedly connected to the left end of the rod part 3b11 and in an umbrella shape, the left half body 3a2 is embedded with an annular sealing gasket 3c, the check spring 3b2 is sleeved outside the column part 3a31, two ends of the check spring are respectively abutted against the head part 3b12 and the right half body 3a3, and the head part 3b12 is abutted against the sealing gasket 3c to seal a center hole of the check spring.

Further, as shown in fig. 1, 4 and 5, a second check assembly 4 is disposed in the water inlet channel 1a, a second annular clamping groove 1f is disposed in the water inlet channel 1a, the second check assembly 4 includes a second housing 4a having an elastic clamping portion 4a1 disposed in the second clamping groove 1f and a second check core 4b disposed in the second housing 4a for realizing a check function, and the first check core 3b has the same check direction as the second check core 4 b. The water inlet channel 1a is internally provided with a second shoulder 1g, and the right end of the second shell 4a is abutted against the second shoulder 1 g. The second shell 4a comprises a second right half body 4a3, a second left half body 4a2 which is annular and a plurality of connecting pieces 4a4 which are distributed along the circumferential direction and are fixedly connected with the second right half body 4a3 and the second left half body 4a2 at the same time, each elastic card 4a11 is positioned at the right end of the second left half body 4a2, the outer diameter of the second right half body 4a3 is smaller than the outer diameter of the second left half body 4a2, and the outer diameter of the second right half body 4a3 has taper. The second check core 4b comprises a second valve core 4b1 which is slidably connected in the second right half 4a3 and a second check spring 4b2 which acts on the second valve core 4b1, and the second valve core 4b1 can extend into the second left half 4a2 to seal the second check spring under the action of the second check spring 4b 2. Specifically, the center of the right half body 4a3 is provided with a column-shaped part 4a31, the valve core 4b1 comprises a rod part 4b11 penetrating through the column-shaped part 4a31 and a umbrella-shaped head part 4b12 fixedly connected to the left end of the rod part 4b11, the left half body 4a2 is embedded with an annular sealing gasket 4c, the check spring 4b2 is sleeved outside the column-shaped part 4a31, two ends of the check spring are respectively abutted against the head part 4b12 and the right half body 4a3, and the head part 4b12 is abutted against the sealing gasket 4c to seal a center hole of the sealing gasket.

When the check valve is installed, the first check assembly 3 is installed in the water outlet channel 1b of the valve body 1 from right to left, and the second check assembly 4 is installed in the water inlet channel 1a of the valve body 1 from left to right. In the state of no water inflow, the valve core I3 b1 stretches into the left half body I3 a2 of the shell I3 a under the action of the check spring I3 b2 to form a plug, and the valve core II 4b1 stretches into the left half body II 4a2 of the shell II 4a under the action of the check spring II 4b2 to form a plug. When water is fed, water pressure firstly acts on the valve core II 4b1, so that the valve core II 4b1 overcomes the action of the check spring II 4b2 to open the left half body I3 a2 of the first shell 3a, and water enters the valve body 1 from the water inlet channel 1a and enters the water outlet channel 1b after being filtered by the filter screen 2. The water pressure of the water entering the water outlet channel 1b acts on the valve core I3 b1, so that the valve core I3 b1 overcomes the action of the check spring I3 b2 to open the left half body II 4a2 of the shell II 4a, and finally the water flows out of the water outlet channel 1b and is supplied to a pipe network. The first check component 3 and the second check component 4 form a double check structure, and the second check component 4 can still play a role in preventing the medium from flowing back into the pipeline in front of the water inlet end when the first check component 3 fails. The first check component 3 and the second check component 4 are respectively positioned in the water outlet channel 1b and the water inlet channel 1a, the distance between the first check component and the second check component is relatively far, a filter channel 1c which is obliquely arranged relative to the water inlet channel 1a is also arranged, and meanwhile, the filter screen 2 can also form certain resistance to the medium flowing back, so that the second check component 4 is given enough time to form closing on the basis of relatively bending a medium flowing back path. Through the arrangement, the backflow preventing effect is greatly improved.

Example two

The present embodiment is basically the same in structure and principle as the first embodiment, except that: in this embodiment, the water inlet end has an external thread, the water outlet end is sleeved with a loose joint nut 5, and the outside of the water outlet end is provided with a clamp spring 6 capable of preventing the loose joint nut 5 from separating from the water outlet end.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the utility model or exceeding the scope of the utility model as defined in the accompanying claims.

Claims (8)

1. The filter backflow prevention valve comprises a valve body (1) with a water inlet channel (1 a) at the left end and a water outlet channel (1 b) at the right end, wherein the water inlet channel (1 a) and the water outlet channel (1 b) are arranged on the same central line or are parallel, the valve body (1) is internally provided with a filter channel (1 c) which is obliquely arranged relative to the water inlet channel (1 a) and is communicated with the water inlet channel (1 a) and is internally provided with a filter screen (2) with the water outlet channel (1 c), the water outlet channel (1 b) is internally provided with a first check component (3), the water inlet channel (1 a) is internally provided with a second check component (4), the water outlet channel (1 b) is internally provided with a circular clamping groove (1 d), the first check component (3) comprises a first shell (3 a) with an elastic clamping part (3 a 1) positioned in the clamping groove (1 d) at the outer side, a check core (3 b) which is arranged in the first shell (3 a) and is used for realizing a check function, the water inlet channel (1 a) is internally provided with a second check component (4) which is positioned in the second shell (4 a) and is positioned in the second shell (4 f) with the second annular clamping groove (4 b), the first check core (3 b) and the second check core (4 b) have the same check direction.

2. The backflow prevention valve for filtration according to claim 1, wherein the water outlet channel (1 b) has a first shoulder (1 e), the left end of the first housing (3 a) abuts against the first shoulder (1 e), the water inlet channel (1 a) has a second shoulder (1 g), and the right end of the second housing (4 a) abuts against the second shoulder (1 g).

3. The backflow prevention valve according to claim 1 or 2, wherein the first elastic clamping portion (3 a 1) comprises a plurality of first elastic clamping pieces (3 a 11) uniformly distributed along the circumferential direction, the left end of each first elastic clamping piece (3 a 11) is fixedly connected with the first casing (3 a), and the right end of each first elastic clamping piece (3 a 11) is inclined towards the direction away from the central line of the first casing (3 a) at the left end and is positioned in the first clamping groove (1 d).

4. A valve for preventing backflow by filtration according to claim 3, wherein the first casing (3 a) comprises a first right half (3 a 3), a first left half (3 a 2) in the shape of a circular ring, and a plurality of connecting pieces (3 a 4) circumferentially distributed and fixedly connected with the first right half (3 a 3) and the first left half (3 a 2), each elastic card (3 a 11) is positioned at the right end of the first left half (3 a 2), the first check core (3 b) comprises a first valve core (3 b 1) slidably connected in the first right half (3 a 3) and a first check spring (3 b 2) acting on the first valve core (3 b 1), and the first valve core (3 b 1) can extend into the first left half (3 a 2) to be blocked under the action of the first check spring (3 b 2).

5. The backflow prevention valve according to claim 1 or 2, wherein the second elastic clamping portion (4 a 1) comprises a plurality of second elastic clamping pieces (4 a 11) uniformly distributed along the circumferential direction, the left end of each second elastic clamping piece (4 a 11) is fixedly connected with the second casing (4 a), and the right end of each second elastic clamping piece (4 a 11) is inclined towards the direction away from the center line of the second casing (4 a) at the left end and is positioned in the second clamping groove (1 f).

6. The backflow preventing valve for filtering of claim 5, wherein the second casing (4 a) comprises a second right half (4 a 3), a second left half (4 a 2) in the shape of a circular ring, and a plurality of connecting pieces (4 a 4) which are circumferentially distributed and are fixedly connected with the second right half (4 a 3) and the second left half (4 a 2) at the same time, each elastic card (4 a 11) is positioned at the right end of the second left half (4 a 2), the second check core (4 b) comprises a second valve core (4 b 1) which is slidably connected in the second right half (4 a 3) and a second check spring (4 b 2) which acts on the second valve core (4 b 1), and the second valve core (4 b 1) can extend into the second left half (4 a 2) to be blocked under the action of the second check spring (4 b 2).

7. The backflow prevention valve according to claim 1 or 2, wherein the water outlet end is provided with an external thread, the water inlet end is sleeved with a loose joint nut (5), and the outer side of the water inlet end is provided with a snap spring (6) capable of preventing the loose joint nut (5) from being separated from the water inlet end.

8. The backflow prevention valve according to claim 1 or 2, wherein the water inlet end is provided with an external thread, the water outlet end is sleeved with a loose joint nut (5), and the outer side of the water outlet end is provided with a snap spring (6) capable of preventing the loose joint nut (5) from being separated from the water outlet end.

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