Pipeline backflow preventer and method thereof

Abstract

The present invention discloses a pipeline backflow preventer and a method thereof, comprising a preventer body, the preventer body is provided with a water inlet cavity and a drainage cavity, and a first valve and a second valve that can move back and forth are provided inside the preventer body, a rotatable adjustment ring plate is provided on the inner wall of the drainage cavity input end, and a plurality of retractable cleaning mechanisms are provided on the outer side of the adjustment ring plate, the cleaning mechanism comprises a first adjustment plate and a second adjustment plate, the first adjustment plate moves back and forth synchronously with the second valve, a first cleaning plate is provided on the first adjustment plate, the second adjustment plate is located at the drainage cavity input end, and a second cleaning plate is provided on the second adjustment plate. Automatic cleaning inside the preventer body can be achieved, and the connection between the second valve and the drainage cavity input end is effectively prevented from being excessively filled with impurities and being poorly sealed; the design of the first adjustment plate and the second adjustment plate can be better hidden and does not affect the overall use.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline backflow preventers, and in particular relates to a pipeline backflow preventer and a method thereof. Background Art

[0002] The pipeline backflow preventer is a device composed of check components that can prevent the backflow of water in the water supply pipeline. It is a hydraulic control combination device that strictly limits the water in the pipeline to flow in one direction. It is developed when the backflow pollution of the drinking water pipeline is serious and there is no effective device to prevent backflow pollution. Its function is to prevent the medium in the pipeline from flowing back under any working conditions to achieve the purpose of avoiding backflow pollution. At present, the backflow preventer is mainly divided into two categories: low-resistance backflow preventer and pressure-reducing backflow preventer. According to national standards, the head loss of the low-resistance backflow preventer is less than 3 meters, and the head loss of the pressure-reducing backflow preventer is less than 7 meters. The low-resistance backflow preventer is composed of two independent spring-assisted elastic sealing check valves and an independent hydraulic differential drain valve in the middle pressure-reducing chamber. The pressure chamber of the drain valve is connected to the upstream water supply pressure. The three internal valves have no mechanical connection except the common valve body (that is, no common related mechanical failure will occur at the same time), and each valve is guaranteed to act independently, strictly limiting the pressure water in the pipeline to flow in one direction.

[0003] In the process of using the existing pipeline backflow preventer, the inventor found that after long-term use, the existing pipeline backflow preventer will have a poor valve seal due to excessive accumulation of impurities in the pipeline, and it is necessary to manually clean the inside of the pipeline. The traditional cleaning method is to disassemble the pipeline backflow preventer, clean it manually, and then install it again, which is very troublesome and requires cutting off the pipeline flow at both ends, affecting the original pipeline transportation efficiency.

[0004] Therefore, in view of this, the inventor, based on his many years of rich experience in design, development and actual production in the relevant industry, has studied and improved the existing structure and defects, and provided a pipeline backflow preventer and method thereof, in order to achieve a more practical purpose. Summary of the invention

[0005] In view of at least one problem in the prior art, an object of the present invention is to provide a pipeline backflow preventer and a method thereof.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A pipeline backflow preventer comprises a preventer body, wherein a water inlet chamber is provided at one end of the preventer body, a drainage chamber is provided at the other end of the preventer body, and an air sealing chamber is provided in the middle of the preventer body, wherein the air sealing chamber is respectively connected with the water inlet chamber and the drainage chamber, wherein a first valve which can move back and forth is provided at the output end of the water inlet chamber, a second valve which can move back and forth is provided at the input end of the drainage chamber, an emptying device is provided below the air sealing chamber, a rotatable adjusting ring plate is provided on the inner wall of the input end of the drainage chamber, a plurality of retractable cleaning mechanisms are provided on the outer side of the adjusting ring plate, wherein the cleaning mechanism comprises a first adjusting plate and a second adjusting plate, wherein the first adjusting plate moves back and forth synchronously with the second valve, a first cleaning plate which can rotate and is used to clean impurities at the edge of the second valve is provided on the first adjusting plate, the second adjusting plate is located at the input end of the drainage chamber, and a second cleaning plate which is used to clean impurities at the edge of the input end of the drainage chamber is provided on the second adjusting plate.

[0008] Preferably, a first fixed rod is fixedly connected in the middle of the water inlet chamber, the first fixed rod is movably and sealingly connected to pass through the middle of the first valve, and the first fixed rod is provided with a first spring for driving the first valve to close automatically, a second fixed rod is fixedly connected in the middle of the drainage chamber, the second fixed rod is movably and sealingly connected to pass through the middle of the second valve, and the second fixed rod is provided with a second spring for driving the second valve to close automatically, a rotating ring plate is rotatably connected in the middle of the second fixed rod, a plurality of fixedly connected impellers are provided on the rotating ring plate, and the outer side of the impeller is fixedly connected to the adjusting ring plate.

[0009] Preferably, the first adjustment plate and the second adjustment plate are both provided with corresponding slide grooves, and a slide rod is provided between the first adjustment plate and the second adjustment plate, the slide rod is slidably and sealedly connected to the slide groove, the second valve is provided with a limit ring groove with a convex cross-section, the limit ring groove is provided with a limit protrusion that is slidably and sealedly connected, and the limit protrusion is fixedly connected to the first adjustment plate.

[0010] Preferably, a first adjusting groove is provided on the first adjusting plate, a first connecting shaft rotatably connected is provided between the first cleaning plate and the first adjusting groove, a second adjusting groove is provided on the second adjusting plate, a second connecting shaft rotatably connected is provided between the second cleaning plate and the second adjusting groove, support grooves are provided on the inner walls of the first adjusting groove and the second adjusting groove, a support rod that can move back and forth is provided in the support groove, a limiting groove with a convex cross-section is provided on the first cleaning plate and the second cleaning plate, a limiting block that is slidably connected is provided in the limiting groove, and the end of the support rod is rotatably connected to the limiting block.

[0011] Preferably, the first adjustment plate and the second adjustment plate are both provided with drive grooves, the drive grooves are both connected with the slide grooves, and the drive grooves are both provided with drive blocks that are slidable and sealed, the drive blocks are fixedly connected with the slide rods, and one side of the drive groove is provided with a drainage groove that is connected with the support groove.

[0012] Preferably, the adjustment ring plate is provided with a plurality of recovery grooves, the second adjustment plate is slidably and sealingly connected to the recovery grooves, the side walls of the recovery grooves are provided with symmetrically distributed card slots, and the second adjustment plate is provided with a retractable card rod for card slot engagement connection.

[0013] Preferably, the second adjustment plate is provided with symmetrically distributed positioning grooves, the card rod is slidably connected in the positioning groove, a reset groove is provided on the inner wall of the positioning groove, a slidably connected reset block is provided in the reset groove, the reset block is fixedly connected to the card rod, and a reset spring is provided in the reset groove for driving the card rod to automatically pop out, the positioning groove is communicated with the sliding groove, adjacent card rods are provided with connected and bendable connecting pieces, and the sliding rod is provided with a retractable lever for moving the connecting piece.

[0014] Preferably, a top groove is provided at the end of the sliding rod, a slidably connected top rod is provided in the top groove, a hidden groove is provided on one side of the sliding rod, a slidably connected hidden rod is provided in the hidden groove, the end of the hidden rod is unidirectionally connected to the lever, an ejection spring is provided in the hidden groove for driving the hidden rod to automatically pop out, and a communicating synchronization groove is provided between the hidden groove and the top groove, a bendable synchronization member is provided in the synchronization groove, one end of the synchronization member is fixedly connected to the top rod, and the other end of the synchronization member is fixedly connected to the hidden rod.

[0015] Preferably, the lever is provided with a groove for placing the connecting piece, a hinge for rotational connection is provided between the hidden rod and the lever, the hinge is arranged on one side of the groove, and a torsion spring for driving the lever to rotate automatically is provided on the hinge.

[0016] A backflow prevention method of a pipeline backflow preventer, using the pipeline backflow preventer, comprising the following steps:

[0017] When the liquid in the S1 pipe passes through the water inlet cavity, the first valve is pushed open, so that the liquid enters the air sealing cavity. After the air sealing cavity is filled with liquid, the second valve is pushed open and the liquid is discharged from the drainage cavity.

[0018] S2 When the liquid in the drainage chamber flows back, the second valve can be squeezed to seal the input end of the drainage chamber to prevent the liquid from flowing back, and the first valve seals the output end of the water inlet chamber. The liquid in the air sealing chamber is discharged through the drainer, so that the air sealing chamber is airtight;

[0019] S3 When the second valve needs to be cleaned, it is only necessary to rotate the adjustment ring plate when the second valve is opened, so that the first adjustment plate and the second adjustment plate are extended at the same time, and then the first cleaning plate and the second cleaning plate are controlled to rotate and open, so that the rotating first cleaning plate and the second cleaning plate can automatically clean the connection edge of the second valve and the input end of the drainage chamber respectively.

[0020] Compared with the prior art, the present invention has the following technical effects:

[0021] The design of the adjusting ring plate, the first cleaning plate and the second cleaning plate can drive the first cleaning plate and the second cleaning plate to rotate by rotating the adjusting ring plate, so that the first cleaning plate and the second cleaning plate can automatically clean the connection between the second valve and the input end of the drainage chamber, effectively preventing the connection between the second valve and the input end of the drainage chamber from being filled with excessive impurities, resulting in a decrease in the sealing performance of the second valve and a poor sealing. The design of the first adjusting plate and the second adjusting plate can achieve that the first cleaning plate and the second cleaning plate can be better hidden when not in use, without affecting the overall use, and are more convenient and quick when in use.

[0022] The design of the impeller can make the water flow through the drainage chamber impact the impeller and rotate the impeller, thereby realizing the automatic rotation of the adjusting ring plate, thereby realizing the automatic rotation cleaning of the first cleaning plate and the second cleaning plate;

[0023] The design of the latching rod and the latching slot enables the second adjustment plate to be automatically fixed after being extended after moving outward by means of the latching rod and the latching slot. In this way, during the recovery process, when the first adjustment plate and the second adjustment plate are squeezed close to each other, the second adjustment plate will not move toward the recovery slot, thereby ensuring the stability of the first adjustment plate and the second adjustment plate during recovery.

[0024] With reference to the following description and the accompanying drawings, the specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope thereby.

[0025] Features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0026] It should be emphasized that the term “include / comprises” when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying creative labor.

[0028] Figure 1 This is a schematic diagram of the three-dimensional structure provided by the present invention.

[0029] Figure 2 This is a schematic diagram of the three-dimensional structure when the second valve provided by the present invention is opened.

[0030] Figure 3 This is a schematic diagram of the three-dimensional structure of the second valve and cleaning mechanism provided by the present invention.

[0031] Figure 4 A schematic diagram of the cross-sectional connection structure of the first adjustment plate, the second adjustment plate and the sliding rod provided by the present invention.

[0032] Figure 5 This is a schematic diagram of the cross-sectional connection structure of the clamping rod, the sliding groove and the sliding rod provided by the present invention.

[0033] Figure 6 This is a schematic diagram of the cross-sectional connection structure of the push rod, the sliding rod and the shifting rod provided by the present invention.

[0034] Explanation of the reference numerals in the figure: 1. preventer body; 11. water inlet chamber; 111. first valve; 112. first fixing rod; 12. drainage chamber; 121. second fixing rod; 122. second valve; 13. fixing frame; 14. adjusting ring plate; 141. impeller; 142. rotating ring plate; 143. connecting ring plate; 15. drainer; 16. cleaning mechanism; 161. first adjusting plate; 1661. first adjusting slot; 162. second adjusting plate; 1621. second adjusting slot; 163. first cleaning plate; 164. second cleaning plate; 165. slide rod; 1651. slide slot; 1 652, driving block; 1653, driving groove; 1654, supporting groove; 1655, drainage groove; 1656, limiting block; 1657, limiting groove; 1658, supporting rod; 166, cleaning sheet; 167, clamping rod; 1671, reset block; 1672, reset groove; 1673, reset spring; 1674, connecting piece; 168, lever; 1681, ejector rod; 1682, hidden rod; 1683, ejector spring; 1684, top groove; 1685, synchronous groove; 1686, synchronous piece; 1687, hidden groove; 160, limiting protrusion; 17, air sealing chamber. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0036] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be another element centered thereon. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be another element centered thereon at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0038] Example 1, please refer to Figure 1 , Figure 2 and Figure 3 A pipeline backflow preventer comprises a preventer body 1, a water inlet chamber 11 is provided at one end of the preventer body 1, a drainage chamber 12 is provided at the other end of the preventer body 1, and an air sealing chamber 17 is provided in the middle of the preventer body 1, the air sealing chamber 17 is communicated with the water inlet chamber 11 and the drainage chamber 12 respectively, a first valve 111 that can move back and forth is provided at the output end of the water inlet chamber 11, a second valve 122 that can move back and forth is provided at the input end of the drainage chamber 12, an emptying device 15 is provided below the air sealing chamber 17, and a rotatable regulating valve 12 is provided on the inner wall of the input end of the drainage chamber 12 The section ring plate 14 and the outer side of the adjustment ring plate 14 are each provided with a plurality of retractable cleaning mechanisms 16, the cleaning mechanism 16 comprising a first adjustment plate 161 and a second adjustment plate 162, the first adjustment plate 161 and the second valve 122 move back and forth synchronously, the first adjustment plate 161 is provided with a rotatable first cleaning plate 163 for cleaning impurities at the edge of the second valve 122, the second adjustment plate 162 is located at the input end of the drainage chamber 12, and the second adjustment plate 162 is provided with a second cleaning plate 164 for cleaning impurities at the edge of the input end of the drainage chamber 12.

[0039] The design of the adjusting ring plate 14, the first cleaning plate 163 and the second cleaning plate 164 can drive the first cleaning plate 163 and the second cleaning plate 164 to rotate by rotating the adjusting ring plate 14, so that the first cleaning plate 163 and the second cleaning plate 164 can automatically clean the connection between the second valve and the input end of the drainage chamber 12, effectively preventing excessive impurities at the connection between the second valve and the input end of the drainage chamber 12, resulting in a decrease in the sealing of the second valve 122 and a poor seal; the design of the first adjusting plate 161 and the second adjusting plate 162 can achieve that the first cleaning plate 163 and the second cleaning plate 164 can be better hidden when not in use, without affecting the overall use, and it is also more convenient and quick when in use.

[0040] In this example, see Figure 1 , Figure 2 and Figure 3 A first fixed rod 112 is fixedly connected in the middle of the water inlet chamber 11, and the first fixed rod 112 is movably and sealedly connected to pass through the middle of the first valve 111, and a first spring for driving the first valve 111 to close automatically is provided on the first fixed rod 112, and a second fixed rod 121 is fixedly connected in the middle of the drainage chamber 12, and the second fixed rod 121 is movably and sealedly connected to pass through the middle of the second valve 122, and a second spring for driving the second valve 122 to close automatically is provided on the second fixed rod 121, and a rotating ring plate 142 is rotatably connected in the middle of the second fixed rod 121, and a plurality of fixedly connected impellers 141 are provided on the rotating ring plate 142, and the outer side of the impeller 141 is fixedly connected to the adjusting ring plate 14, wherein a fixing frame 13 for fixing the first fixed rod 112 and the second fixed rod 121 is provided in the preventer body 1; a connecting ring groove with a convex cross-section is provided on the inner wall of the drainage chamber 12, and a connecting ring plate 143 with sliding and sealing connection is provided in the connecting ring groove, and the connecting ring plate 143 is fixedly connected to the adjusting ring plate 14.

[0041] The design of the impeller 141 can impact the impeller 141 when water flows through the drainage chamber 12, causing the impeller 141 to rotate, thereby realizing automatic rotation of the adjusting ring plate 14, thereby realizing automatic rotation cleaning of the first cleaning plate 163 and the second cleaning plate 164.

[0042] See also Figure 4 In this embodiment, corresponding slide grooves 1651 are provided on the first adjustment plate 161 and the second adjustment plate 162, and a slide rod 165 is provided between the first adjustment plate 161 and the second adjustment plate 162, and the slide rod 165 is slidably and sealedly connected to the slide groove 1651, and a limiting ring groove with a convex cross-section is provided on the second valve, and a limiting protrusion 160 is slidably and sealedly connected in the limiting ring groove, and the limiting protrusion 160 is fixedly connected to the first adjustment plate 161.

[0043] The design of the slide groove 1651 and the slide rod 165 ensures that the first adjustment plate 161 and the second adjustment plate 162 always approach and move away in the same direction. At the same time, the combination of the limiting protrusion 160 and the limiting ring groove can achieve the synchronous movement of the first adjustment plate 161 and the second valve 122 without affecting the rotation of the first adjustment plate 161, so that the first cleaning plate 163 and the second cleaning plate 164 can better perform rotation cleaning.

[0044] As a possible implementation, see Figure 4 The first adjusting plate 161 is provided with a first adjusting groove 1661, a first connecting shaft rotatably connected is provided between the first cleaning plate 163 and the first adjusting groove 1661, a second adjusting groove 1621 is provided on the second adjusting plate 162, a second connecting shaft rotatably connected is provided between the second cleaning plate 164 and the second adjusting groove 1621, support grooves 1654 are provided on the inner walls of the first adjusting groove 1661 and the second adjusting groove 1621, a support rod 1658 that can move back and forth is provided in the support groove 1654, a limiting groove 1657 with a convex cross-section is provided on the first cleaning plate 163 and the second cleaning plate 164, a limiting block 1656 that is slidably connected is provided in the limiting groove 1657, the end of the support rod 1658 is rotatably connected to the limiting block 1656, and a cleaning sheet 166 is provided on the first cleaning plate 163 and the second cleaning plate 164.

[0045] The back-and-forth movement of the support rod 1658 and the combination of the limit groove 1657 and the limit block 1656 can realize the rotation opening and closing of the first cleaning plate 163 and the second cleaning plate 164. The addition of the cleaning sheet 166 can make the first cleaning plate 163 and the second cleaning plate 164 better fit the surface to be cleaned, thereby improving the cleaning efficiency.

[0046] See also Figure 4 In this embodiment, a driving groove 1653 is provided in the first adjustment plate 161 and the second adjustment plate 162. The driving groove 1653 is communicated with the slide groove 1651, and a driving block 1652 is provided in the driving groove 1653 for sliding and sealing connection. The driving block 1652 is fixedly connected to the slide rod 165. A drainage groove 1655 communicated with the support groove 1654 is provided on one side of the driving groove 1653. Synchronous liquid is provided in the driving groove 1653, the drainage groove 1655 and the support groove 1654.

[0047] When the first adjusting plate 161 can be separated from the second adjusting plate 162 , the slide bar 165 drives the driving block 1652 to move, thereby realizing the automatic rotation and opening of the first cleaning plate and the second cleaning plate through hydraulic transmission.

[0048] See also Figure 5In this embodiment, a plurality of recovery grooves are provided on the adjustment ring plate 14, the second adjustment plate 162 is slidably and sealedly connected to the recovery groove, symmetrically distributed card grooves are provided on the side walls of the recovery groove, and a retractable card rod 167 is provided on the second adjustment plate 162 for card slot engagement connection.

[0049] The design of the latch rod 167 and the latch slot enables the second adjustment plate 162 to be automatically fixed after being extended after moving outward by means of the latch rod 167 and the latch slot engaging with each other. In this way, during the recovery process, when the first adjustment plate 161 and the second adjustment plate 162 are squeezed close to each other, the second adjustment plate 162 will not move toward the recovery slot, thereby ensuring the stability of the first adjustment plate 161 and the second adjustment plate 162 during recovery.

[0050] In this example, see Figure 5 and Figure 6 The second adjusting plate 162 is provided with symmetrically distributed positioning grooves, the card rod 167 is slidably connected in the positioning groove, a reset groove 1672 is provided on the inner wall of the positioning groove, a slidably connected reset block 1671 is provided in the reset groove 1672, the reset block 1671 is fixedly connected to the card rod 167, and a reset spring 1673 for driving the card rod 167 to automatically pop out is provided in the reset groove 1672. The positioning groove is communicated with the slide groove 1651, and a connected and bendable connecting piece 1674 is provided between adjacent card rods 167. A retractable lever 168 for moving the connecting piece 1674 is provided on the slide rod 165.

[0051] The design of the return spring 1673 and the return block 1671 can make the card rod 167 move to the card slot, and the card rod 167 can automatically pop out under the action of the return spring 1673 to achieve the card rod 167 and the card slot The card slot is fixed, and when it is recovered, only when the first adjustment plate 161 and the second adjustment plate 162 are about to get close, the lever 168 on the slide bar 165 can push the connecting piece 1674, thereby driving the card rod 167 to be synchronously recovered, thereby achieving the unlocking of the card rod 167, and with the recovery of the second valve 122, the first adjustment plate 161 and the second adjustment plate 162 can be squeezed into the recovery groove, thereby achieving the automatic recovery of the first adjustment plate 161 and the second adjustment plate 162, and the normal opening and closing of the second valve 122 is not affected; at the same time, when the first adjustment plate 161 and the second adjustment plate 162 are completely fitted, the lever 168 is contracted, so that the lever 168 can be separated from the connecting piece 1674, thereby not affecting the next automatic pop-up of the card rod 167.

[0052] See also Figure 5 and Figure 6In this embodiment, a top groove 1684 is provided at the end of the slide bar 165, and a slidingly connected top rod 1681 is provided in the top groove 1684. A hidden groove 1687 is provided on one side of the slide bar 165, and a slidingly connected hidden rod 1682 is provided in the hidden groove 1687. The end of the hidden rod 1682 is unidirectionally rotatably connected to the lever 168, and an ejection spring 1683 for driving the hidden rod 1682 to automatically pop out is provided in the hidden groove 1687, and a hidden groove 1687 is provided between the hidden groove 1687 and the top groove 1684. A synchronous groove 1685 is connected to each other, and a bendable synchronous member 1686 is provided in the synchronous groove 1685. One end of the synchronous member 1686 is fixedly connected to the top rod 1681, and the other end of the synchronous member 1686 is fixedly connected to the hidden rod 1682. A groove for placing the connecting member 1674 is provided on the lever 168. A hinge for rotation connection is provided between the hidden rod 1682 and the lever 168. The hinge is arranged on one side of the groove, and a torsion spring is provided on the hinge for driving the lever 168 to rotate automatically.

[0053] In this application, when cleaning the pipe backflow preventer:

[0054] As the water pressure completely pushes the second valve 122 open, at this time, the second valve 122 drives the first adjustment plate 161 and the second adjustment plate 162 to separate from the recovery groove. When the clamping rod 167 moves to the clamping groove, the elasticity of the return spring 1673 can drive the clamping rod 167 to automatically pop out and engage with the clamping groove, so that the second adjustment plate 162 is automatically fixed. As the second valve 122 continues to move, the first adjustment plate 161 can be mobilized to separate from the second adjustment plate 162. The first adjustment plate 161 and the second adjustment plate 162 move outward along the two ends of the sliding rod 165. During the movement, the driving block 1652 can be driven to move, thereby the hydraulic transmission In this way, the support rod 1658 is squeezed to move outward, so that the support rod 1658 rotates the first cleaning plate 163 and the second cleaning plate 164 outward synchronously to squeeze and open, so that the cleaning sheet 166 fits with the corresponding surface to be cleaned, and when the water flows through the impeller 141, it can drive the impeller 141 to rotate, thereby rotating the adjusting ring plate 14. Once the second valve 122 is fully opened, the first cleaning plate 163 and the second cleaning plate 164 can automatically rotate with the rotation of the adjusting ring plate 14, thereby automatically cleaning the second valve 122 and the input end of the drainage chamber 12, effectively preventing the accumulation of impurities and reducing the sealing effect of the second valve 122;

[0055] When the second valve 122 is closed, the second valve 122 first squeezes the first adjusting plate 161 toward the second adjusting plate 162, so that the first cleaning plate 163 and the second cleaning plate 164 can automatically rotate and recover into the corresponding first adjusting plate 161 and the second adjusting plate 162 through the hydraulic transmission driving mode. When the first cleaning plate 163 and the second cleaning plate 164 are completely recovered, as the first adjusting plate 161 and the second adjusting plate 162 are close to each other, the lever 168 on the slide bar 165 can squeeze the connecting member 1674, so that the connecting member 1674 drives the clamping rod 167 to be automatically recovered, and the clamping fixation of the clamping rod 167 and the clamping groove is automatically released. As the slide bar 165 continues to move, the push rod 1681 can move toward the end of the corresponding slide groove 1651, so that the push rod 1681 is squeezed, and the squeezing of the push rod 1681 can drive the hidden rod 1682 to be automatically recovered to the hidden groove 168 through the synchronous member 1686. 7, so that the lever 168 can be automatically recovered into the hidden groove 1687, so that the lever 168 and the connecting member 1674 are automatically separated. Under the action of the reset spring 1673, the connecting member 1674 moves to one side of the lever 168, and the one-way rotation connection between the lever 168 and the hidden rod 1682 and the design of the torsion spring can make the lever 168 separate from the second adjustment plate 161 when the first adjustment plate 162 is separated, that is, when the slide bar 165 is separated from the end of the slide groove 1651. Under the action of the ejection spring 1683, 168 can drive the ejector rod 1681 and the lever 168 to pop out automatically. At this time, when the lever 168 moves to the connecting piece 1674, the connecting piece 1674 can rotate over the lever 168 by squeezing the lever 168, thereby not affecting the overall operation. At the same time, the addition of the torsion spring can enable the lever 168 to automatically rotate and restore to its initial state after the connecting piece 1674 passes over the lever 168, so as to facilitate automatic unlocking next time.

[0056] A backflow prevention method for a pipeline backflow preventer, using a pipeline backflow preventer, comprising the following steps:

[0057] When the liquid in the S1 pipe passes through the water inlet chamber 11, the first valve 111 is pushed open, so that the liquid enters the air sealing chamber 17. After the liquid fills the air sealing chamber 17, the second valve 122 is pushed open and the liquid is discharged from the drainage chamber 12.

[0058] S2 When the liquid in the drainage chamber 12 flows back, the second valve 122 can be squeezed to seal the input end of the drainage chamber 12 to prevent the liquid from flowing back, and the first valve 111 seals the output end of the water inlet chamber 11, and the liquid in the air sealing chamber 17 is discharged through the drain 15, so that the air sealing chamber 17 is airtight;

[0059] S3 When the second valve 122 needs to be cleaned, it is only necessary to rotate the adjusting ring plate 14 when the second valve 122 is opened, so that the first adjusting plate 161 and the second adjusting plate 162 are extended at the same time, and then the first cleaning plate 163 and the second cleaning plate 164 are controlled to rotate and open, so that the rotating first cleaning plate 163 and the second cleaning plate 164 automatically clean the connecting edge of the second valve 122 and the input end of the drainage chamber 12 respectively.

[0060] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for all purposes. The term "consisting essentially of..." to describe a combination should include the identified elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe a combination of elements, ingredients, parts or steps herein also contemplates embodiments that consist essentially of these elements, ingredients, parts or steps. By using the term "may", it is intended to indicate that any attribute described that "may" include is optional.

[0061] Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "an" used to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.

[0062] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present application should not be determined with reference to the above description, but should be determined with reference to the appended claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a waiver of the subject matter, nor should it be considered that the inventors did not consider the subject matter to be part of the disclosed inventive subject matter.

Claims

1. A pipeline backflow preventer, comprising a preventer body, a water inlet chamber is provided at one end of the preventer body, a drainage chamber is provided at the other end of the preventer body, and an air sealing chamber is provided in the middle of the preventer body, the air sealing chamber is communicated with the water inlet chamber and the drainage chamber respectively, a first valve that can move back and forth is provided at the output end of the water inlet chamber, a second valve that can move back and forth is provided at the input end of the drainage chamber, and an emptying device is provided below the air sealing chamber, characterized in that: A rotatable adjusting ring plate is provided on the inner wall of the input end of the drainage chamber, and a plurality of retractable cleaning mechanisms are provided on the outer side of the adjusting ring plate, and the cleaning mechanisms include a first adjusting plate and a second adjusting plate, the first adjusting plate moves back and forth synchronously with the second valve, the first adjusting plate is provided with a rotatable first cleaning plate for cleaning impurities at the edge of the second valve, the second adjusting plate is located at the input end of the drainage chamber, and the second adjusting plate is provided with a second cleaning plate for cleaning impurities at the edge of the input end of the drainage chamber; A first fixed rod is fixedly connected in the middle of the water inlet chamber, the first fixed rod is movably and sealedly connected to pass through the middle of the first valve, and a first spring for driving the first valve to close automatically is provided on the first fixed rod; a second fixed rod is fixedly connected in the middle of the drainage chamber, the second fixed rod is movably and sealedly connected to pass through the middle of the second valve, and a second spring for driving the second valve to close automatically is provided on the second fixed rod; a rotating ring plate is rotatably connected in the middle of the second fixed rod, a plurality of fixedly connected impellers are provided on the rotating ring plate, and the outer sides of the impellers are fixedly connected to the adjusting ring plate; The first adjustment plate and the second adjustment plate are both provided with corresponding sliding grooves, and a sliding rod is provided between the first adjustment plate and the second adjustment plate, the sliding rod and the sliding groove are slidably and sealedly connected, the second valve is provided with a limiting ring groove with a convex cross-section, and a limiting protrusion is provided in the limiting ring groove that is slidably and sealedly connected, and the limiting protrusion is fixedly connected to the first adjustment plate.

2. The pipeline backflow preventer according to claim 1, characterized in that: The first adjusting plate is provided with a first adjusting groove, a first connecting shaft rotatably connected is provided between the first cleaning plate and the first adjusting groove, a second adjusting groove is provided on the second adjusting plate, a second connecting shaft rotatably connected is provided between the second cleaning plate and the second adjusting groove, supporting grooves are provided on the inner walls of the first adjusting groove and the second adjusting groove, a supporting rod that can move back and forth is provided in the supporting groove, a limiting groove with a convex cross-section is provided on the first cleaning plate and the second cleaning plate, a limiting block that is slidably connected is provided in the limiting groove, and the end of the support rod is rotatably connected to the limiting block.

3. The pipeline backflow preventer according to claim 2, characterized in that: The first adjustment plate and the second adjustment plate are both provided with driving grooves, the driving grooves are both connected with the slide grooves, and the driving grooves are both provided with driving blocks that are sliding and sealed, the driving blocks are fixedly connected with the slide rods, and one side of the driving groove is provided with a drainage groove that is connected with the support groove.

4. The pipeline backflow preventer according to claim 2, characterized in that: The adjusting ring plate is provided with a plurality of recovery grooves, the second adjusting plate is slidably and sealedly connected to the recovery grooves, the side walls of the recovery grooves are provided with symmetrically distributed card slots, and the second adjusting plate is provided with a retractable card rod for card-engaging connection with the card slots.

5. The pipeline backflow preventer according to claim 4, characterized in that: The second adjustment plate is provided with symmetrically distributed positioning grooves, the card rod is slidably connected in the positioning groove, a reset groove is provided on the inner wall of the positioning groove, a slidably connected reset block is provided in the reset groove, the reset block is fixedly connected to the card rod, and a reset spring is provided in the reset groove for driving the card rod to automatically pop out. The positioning groove is communicated with the sliding groove, and adjacent card rods are provided with connected and bendable connecting pieces, and the sliding rod is provided with a retractable lever for moving the connecting piece.

6. The pipeline backflow preventer according to claim 5, characterized in that: A top groove is provided at the end of the sliding rod, a slidably connected top rod is provided in the top groove, a hidden groove is provided on one side of the sliding rod, a slidably connected hidden rod is provided in the hidden groove, the end of the hidden rod is unidirectionally connected to the lever, an ejection spring is provided in the hidden groove for driving the hidden rod to automatically pop out, and a communicating synchronization groove is provided between the hidden groove and the top groove, a bendable synchronization member is provided in the synchronization groove, one end of the synchronization member is fixedly connected to the top rod, and the other end of the synchronization member is fixedly connected to the hidden rod.

7. The pipeline backflow preventer according to claim 6, characterized in that: The lever is provided with a groove for placing a connecting piece, a hinge for rotational connection is provided between the hidden rod and the lever, the hinge is arranged on one side of the groove, and a torsion spring for driving the lever to rotate automatically is provided on the hinge.

8. A backflow prevention method for a pipeline backflow preventer, using the pipeline backflow preventer according to any one of claims 1 to 7, characterized in that: The following steps are involved: When the liquid in the S1 pipe passes through the water inlet cavity, the first valve is pushed open, so that the liquid enters the air sealing cavity. After the air sealing cavity is filled with liquid, the second valve is pushed open and the liquid is discharged from the drainage cavity. S2 When the liquid in the drainage chamber flows back, the second valve can be squeezed to seal the input end of the drainage chamber to prevent the liquid from flowing back, and the first valve seals the output end of the water inlet chamber. The liquid in the air sealing chamber is discharged through the drainer, so that the air sealing chamber is airtight; S3 When the second valve needs to be cleaned, it is only necessary to rotate the adjustment ring plate when the second valve is opened, so that the first adjustment plate and the second adjustment plate are extended at the same time, and then the first cleaning plate and the second cleaning plate are controlled to rotate and open, so that the rotating first cleaning plate and the second cleaning plate can automatically clean the connection edge of the second valve and the input end of the drainage chamber respectively.

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