Backflow preventer structure

Abstract

The present invention belongs to the technical field of backflow preventers, and in particular to a backflow preventer structure. To address the problems of the existing structure being simple, incapable of adjustment, and unable to be actively sealed, the following solution is proposed, comprising a water inlet pipe, one end of the water inlet pipe being connected to a drain pipe, a drain pipe being provided at the bottom of the water inlet pipe, a fixed cylinder being provided at the end of the drain pipe away from the water inlet pipe, a center rod being provided through the interior of the fixed cylinder, a transmission assembly being installed near the position of a surrounding spring in the interior of the fixed cylinder, a threaded ring being fixedly connected to the end of the drain pipe near the water inlet pipe, a closing ring being sleeved on the interior of the threaded ring, a rotating assembly being installed around the outer wall of the threaded ring, a sealing ring being fixedly connected to the interior of the water inlet pipe, a closing block being provided on the side of the sealing ring near the drain pipe, and an extrusion assembly being installed at the end of the sealing ring away from the closing block. The present invention has the advantages of being easy to adjust and capable of emergency active sealing.

Description

Technical Field

[0001] The present invention relates to the technical field of backflow preventers, and in particular to a backflow preventer structure. Background Art

[0002] Backflow preventers are primarily used to effectively isolate the connection between urban water supply networks and various user networks, or to effectively isolate the cross-connections between heterogeneous water systems such as drinking water, firefighting water, air conditioning water, and landscaping water. They are also used as a supporting device for non-negative pressure equipment. Comprising two independent inlet and outlet check valves and a drain valve for fluid safety control, a backflow preventer is a hydraulic control assembly that strictly limits the flow of pressurized water in the pipeline to only one direction. It can prevent the backflow of media in the pipeline under all operating conditions, thereby preventing backflow contamination.

[0003] The structure of traditional backflow preventers is relatively simple. In actual use, they can only be adjusted by the device itself, and cannot be conveniently adjusted according to needs during use. This may easily lead to the spring at one end of the drainage being frequently impacted and contaminated by sewage after long-term use, and unable to rebound well, resulting in a situation where the seal is not tight enough when the pressure difference is small, and the device cannot be closed manually. Summary of the Invention

[0004] The backflow preventer structure proposed by the present invention solves the problems of the traditional device having a simple structure, being unable to be adjusted, and being unable to be actively sealed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A backflow preventer structure includes a water inlet pipe, one end of the water inlet pipe is connected to a drain pipe, a drain pipe is provided at the bottom of the water inlet pipe, the interior of the water inlet pipe and the drain pipe are communicated with each other, a fixed cylinder is provided at the end of the drain pipe away from the water inlet pipe, a center rod is provided inside the fixed cylinder, an end of the center rod close to the water inlet pipe is fixedly connected to a closing plug, an outer wall of the end of the center rod close to the closing plug is surrounded by a surrounding spring, a transmission assembly is installed in the interior of the fixed cylinder near the surrounding spring so that a position is set, an end of the drain pipe close to the water inlet pipe is fixedly connected to a threaded ring, a closing ring is sleeved on the inside of the threaded ring, a rotating assembly is installed around the outer wall of the threaded ring, a sealing ring is fixedly connected to the inside of the water inlet pipe, a closing block is provided on the side of the sealing ring close to the drain pipe, and an extrusion assembly is installed at the end of the sealing ring away from the closing block.

[0007] Preferably, the transmission assembly includes a threaded ring, a connecting gear ring and a driving gear, the top of the connecting gear ring is meshed with the driving gear, the outer wall of the threaded ring is circumferentially provided with threads, and one end of the threaded ring is in contact with the surrounding spring.

[0008] Preferably, the interior of the threaded ring is slidably connected to the center rod, the interior of the connecting gear ring is slidably connected to the center rod, and the outer wall of the threaded ring is rotatably connected to the inner wall of the fixed tube through a thread, and one side of the connecting gear ring is rotatably connected to the interior of the fixed tube through a bearing.

[0009] Preferably, a plurality of fixing rods are arranged around the outer wall of the fixing tube, and a protective sleeve is connected to the outer wall of one end of the fixing tube near the surrounding spring, one end of the protective sleeve is in contact with the closing plug, and a transmission rod is fixedly connected to the driving gear near the edge, and the transmission rod passes through the interior of the fixing rod and is connected to the outside world.

[0010] Preferably, the rotating assembly includes a threaded rod, a rotating gear ring and an inner gear ring. The outer wall at the center of the threaded rod is fixedly connected to a rotating gear ring. The interior of the inner gear ring is respectively meshed with multiple rotating gear rings, and the two sides of the inner gear ring are respectively rotatably connected to the water inlet pipe and the drain pipe.

[0011] Preferably, the two ends of the threaded rod are rotatably connected to the side walls of the water inlet pipe and the drain pipe respectively, a plurality of fixing plates are arranged around the outer wall of the closed ring, one end of the threaded rod is rotatably connected to the fixing plate through a thread, and a plurality of sliding grooves corresponding to the fixing plates are opened on the inner wall of the water inlet pipe.

[0012] Preferably, the extrusion assembly includes a fixed block, a fixed spring and a pull rod, a fixed spring is arranged around the outer wall of one end of the pull rod away from the sealing ring, and the two ends of the fixed spring are respectively connected to the fixed block and one end of the pull rod, and the outer wall of the fixed block is fixed to the inner wall of the water inlet pipe by a metal rod.

[0013] Preferably, the end of the closing plug close to the closing ring is inclined in an arc shape, and a fixed thread is arranged around the outer wall of the end of the closing plug away from the closing ring, and the fixed thread corresponds to the thread on the inner wall of the thread ring. The inside of the sealing ring is inclined toward the side of the extrusion assembly, and one side of the closing block fits with the sealing ring to form a truncated cone.

[0014] Preferably, the inner top of the drain pipe is funnel-shaped, and a closing cap is provided on the top of the drain pipe. The top of the closing cap is inclined on the side close to the closing block, and a filter cover is fixed to the bottom of the closing cap. An extrusion rod is provided at the bottom of the filter cover, and the outer wall of the extrusion rod is connected to the drain pipe through a threaded rotation, and the top of the extrusion rod is T-shaped and contacts the bottom of the filter cover.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. When the elastic force of the surrounding spring decreases after long-term use, the transmission rod can be rotated, and the transmission rod drives the transmission assembly to move, so that the driving gear drives the connecting gear ring to rotate, and the connecting gear ring drives the rotation of the connecting threaded ring through the rotation of the center rod. Since the threaded ring is connected to the inside of the fixed cylinder through threads, the surrounding spring can be squeezed when the threaded ring rotates, so that the closing plug is subjected to additional pressure, thereby ensuring that it can fit tightly with the closing ring during use, and the surrounding spring can also be protected by a protective sleeve during use to prevent it from being contaminated by sewage, and the closing cap can be driven to rise by rotating the extrusion rod to release the blockage of the drain pipe, thereby lowering the water level on the side of the water inlet pipe close to the closing ring, so that the liquid inside the drain pipe can fit the closing plug tightly with the closing ring.

[0017] 2. When emergency closure is required, the rotating assembly can be started to rotate the inner gear ring, and the rotating gear ring drives the threaded rod to rotate, and the threaded rod drives the fixed plate to move along the slide groove, thereby releasing the connection between the closing ring and the threaded ring. At this time, under the action of the surrounding spring, the fixed thread on the outer wall of the closing plug can fit with the inner wall of the threaded ring. The transmission rod is then rotated to start the transmission assembly, and the driving gear drives the center rod to rotate through the connecting gear ring, and the closing plug drives the fixed thread to rotate, and the threaded ring is connected to each other in a rotational connection. At the same time, the rotation of the threaded ring can further squeeze the closing plug with the surrounding spring to maintain the tightness of the connection, and the operation is very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an external schematic diagram of the present invention;

[0019] Figure 2 This is a schematic diagram of the internal structure of one end of the present invention;

[0020] Figure 3 It is a schematic cross-sectional view of the internal structure of the present invention;

[0021] Figure 4 It is a cross-sectional side view of the internal structure of the present invention;

[0022] Figure 5 This is a schematic structural diagram of the extrusion assembly of the present invention;

[0023] Figure 6 This is a schematic diagram of the internal structure of the rotating assembly of the present invention;

[0024] Figure 7 It is a cross-sectional view of the internal structure of the transmission component of the present invention.

[0025] In the figure: 1. Water inlet pipe; 2. Drain pipe; 3. Drain pipe; 4. Fixed cylinder; 401. Fixed rod; 402. Protective sleeve; 5. Center rod; 6. Closing plug; 601. Fixed thread; 7. Surrounding spring; 8. Transmission assembly; 801. Threaded ring; 802. Connecting gear ring; 803. Driving gear; 9. Transmission rod; 10. Closing ring; 101. Fixed plate; 102. Slide groove; 11. Threaded ring; 12. Rotating assembly; 121. Threaded rod; 122. Rotating gear ring; 123. Internal gear ring; 13. Sealing ring; 14. Closing block; 15. Extrusion assembly; 151. Fixed block; 152. Fixed spring; 153. Pull rod; 16. Closing cap; 17. Filter cover; 18. Extrusion rod. DETAILED DESCRIPTION

[0026] 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, rather than all the embodiments.

[0027] Reference Figure 1-7 , a backflow preventer structure, including an inlet pipe 1, one end of the inlet pipe 1 is connected to a drain pipe 2, a drain pipe 3 is provided at the bottom of the inlet pipe 1, the interior of the inlet pipe 1 and the drain pipe 3 are communicated with each other, a fixed cylinder 4 is provided at the end of the drain pipe 2 away from the inlet pipe 1, a center rod 5 is penetrated inside the fixed cylinder 4, the end of the center rod 5 close to the inlet pipe 1 is fixedly connected to a closing plug 6, a surrounding spring 7 is provided around the outer wall of the end of the center rod 5 close to the closing plug 6, a transmission assembly 8 is installed in the interior of the fixed cylinder 4 near the surrounding spring 7, a threaded ring 11 is fixedly connected to the end of the drain pipe 2 close to the inlet pipe 1, a closing ring 10 is sleeved on the inside of the threaded ring 11, a rotating assembly 12 is installed around the outer wall of the threaded ring 11, a sealing ring 13 is fixedly connected to the inside of the water inlet pipe 1, a closing block 14 is provided on the side of the sealing ring 13 close to the drain pipe 2, and an extrusion assembly 15 is installed at the end of the sealing ring 13 away from the closing block 14.

[0028] Furthermore, in the above technical solution, the transmission assembly 8 includes a threaded ring 801, a connecting gear ring 802 and a driving gear 803. The top of the connecting gear ring 802 is meshed with the driving gear 803. The outer wall of the threaded ring 801 is provided with a thread around it, and one end of the threaded ring 801 is in contact with the surrounding spring 7. The interior of the threaded ring 801 is slidably connected to the center rod 5. The interior of the connecting gear ring 802 is slidably connected to the center rod 5. The outer wall of the threaded ring 801 is rotatably connected to the inner wall of the fixed cylinder 4 through a thread, and one side of the connecting gear ring 802 is connected to the inner wall of the fixed cylinder 4 through a thread. The bearing is connected to the interior of the fixed cylinder 4, and the transmission rod 9 is rotated, and the transmission rod 9 drives the transmission assembly 8 to move, so that the driving gear 803 drives the connecting gear ring 802 to rotate, and the connecting gear ring 802 drives the rotation of the connecting threaded ring 801 through the rotation of the center rod 5. Since the threaded ring 801 is connected to the interior of the fixed cylinder 4 through a thread, the surrounding spring 7 can be squeezed when the threaded ring 801 rotates, so that the closing plug 6 is subjected to additional pressure, thereby ensuring that it can fit tightly with the closing ring 10 during use.

[0029] Furthermore, in the above technical solution, a plurality of fixing rods 401 are arranged around the outer wall of the fixing tube 4, and a protective sleeve 402 is connected to the outer wall of one end of the fixing tube 4 near the surrounding spring 7, one end of the protective sleeve 402 is in contact with the closing plug 6, and the driving gear 803 is fixedly connected to a transmission rod 9 near the edge, and the transmission rod 9 passes through the interior of the fixing rod 401 and is connected to the outside world.

[0030] Furthermore, in the above technical solution, the rotating assembly 12 includes a threaded rod 121, a rotating gear ring 122 and an inner gear ring 123. The outer wall of the center of the threaded rod 121 is fixedly connected to the rotating gear ring 122. The interior of the inner gear ring 123 is respectively meshed with multiple rotating gear rings 122. The two sides of the inner gear ring 123 are respectively rotatably connected to the water inlet pipe 1 and the drain pipe 2. The two ends of the threaded rod 121 are respectively rotatably connected to the side walls of the water inlet pipe 1 and the drain pipe 2. A plurality of fixing plates 101 are arranged around the outer wall of the closed ring 10. One end of the threaded rod 121 is It is rotatably connected to the fixing plate 101 through a thread, and the inner wall of the water inlet pipe 1 is provided with a plurality of sliding grooves 102 corresponding to the fixing plate 101. The rotating component 12 is started, and the inner gear ring 123 is rotated, and the threaded rod 121 is driven to rotate by rotating the gear ring 122, and the threaded rod 121 drives the fixing plate 101 to move along the sliding groove 102, thereby releasing the connection between the closing ring 10 and the threaded ring 11. At this time, under the action of the surrounding spring 7, the fixing thread 601 on the outer wall of the closing plug 6 can fit with the inner wall of the threaded ring 11.

[0031] Furthermore, in the above technical solution, the extrusion assembly 15 includes a fixed block 151, a fixed spring 152 and a pull rod 153. The outer wall of the pull rod 153 away from the sealing ring 13 is surrounded by a fixed spring 152, and the two ends of the fixed spring 152 are respectively connected to the fixed block 151 and one end of the pull rod 153. The outer wall of the fixed block 151 is fixed to the inner wall of the water inlet pipe 1 through a metal rod, and the liquid is input through one end of the water inlet pipe 1. At the same time, under the action of pressure, the sealing ring 13 and the closing block 14 are separated, and the closing plug 6 and the closing ring 10 are separated, and then the liquid is discharged through one end of the drain pipe 2. When the discharge stops, the closing block 14 and the closing plug 6 can be driven to move by the extrusion assembly 15 and the surrounding spring 7 respectively to seal and prevent backflow.

[0032] Furthermore, in the above technical solution, the end of the closing plug 6 close to the closing ring 10 is inclined in an arc shape, and the outer wall of the end of the closing plug 6 away from the closing ring 10 is surrounded by a fixed thread 601, and the fixed thread 601 corresponds to the thread on the inner wall of the thread ring 11. The interior of the sealing ring 13 is inclined toward the side of the extrusion component 15, and one side of the closing block 14 fits with the sealing ring 13 in a truncated cone shape. The rotating transmission rod 9 starts the transmission component 8, and then the driving gear 803 drives the center rod 5 to rotate through the connecting gear ring 802, and then the closing plug 6 drives the fixed thread 601 to rotate, and the thread ring 11 is connected to each other in a rotational connection to achieve combination. At the same time, the thread ring 801 can be rotated to further squeeze the closing plug 6 around the spring 7 to maintain the tightness of its connection, and the operation is very convenient.

[0033] Furthermore, in the above technical solution, the inner top end of the drain pipe 3 is funnel-shaped, and a closing cap 16 is provided on the top of the drain pipe 3. The top of the closing cap 16 is inclined near the side of the closing block 14, and a filter cover 17 is fixed to the bottom of the closing cap 16. The bottom of the filter cover 17 is provided with an extrusion rod 18, and the outer wall of the extrusion rod 18 is connected to the drain pipe 3 by a threaded rotation, and the top of the extrusion rod 18 is T-shaped and contacts the bottom of the filter cover 17. When in use, the closing cap 16 can be driven to rise by rotating the extrusion rod 18 to release the closure of the drain pipe 3, thereby lowering the water level on the side of the water inlet pipe 1 near the closing ring 10, so that the liquid inside the drain pipe 2 can tightly fit the closing plug 6 with the closing ring 10.

[0034] Working principle: When in use, liquid can be input through one end of the water inlet pipe 1. At the same time, under the action of pressure, the sealing ring 13 and the closing block 14 are separated, and the closing plug 6 and the closing ring 10 are separated, and then the liquid is discharged through one end of the drain pipe 2. When the discharge stops, the closing block 14 and the closing plug 6 can be driven to move by the extrusion component 15 and the surrounding spring 7 respectively to seal and prevent backflow. When the elastic force of the surrounding spring 7 decreases after long-term use, the transmission rod 9 can be rotated, and then the transmission rod 9 drives the transmission component 8 to move, so that The driving gear 803 drives the connecting gear ring 802 to rotate, and the connecting gear ring 802 drives the connecting threaded ring 801 to rotate through the rotation of the center rod 5. Since the threaded ring 801 is connected to the inside of the fixed cylinder 4 through a thread, the surrounding spring 7 can be squeezed when the threaded ring 801 rotates, so that the closing plug 6 is subjected to additional pressure, thereby ensuring that it can fit tightly with the closing ring 10 during use. In addition, the surrounding spring 7 can be protected by the protective sleeve 402 during use to prevent it from being contaminated by sewage. When in use, the closing cap 16 can be driven to rise by rotating the extrusion rod 18, thereby releasing the seal on the drain pipe 3, thereby lowering the water level on the side of the water inlet pipe 1 close to the sealing ring 10, so that the liquid inside the drain pipe 2 can tightly fit the closing plug 6 with the sealing ring 10. When emergency sealing is required, the rotating assembly 12 can be started to rotate the inner gear ring 123, and then the threaded rod 121 is driven to rotate by rotating the gear ring 122, so that the threaded rod 121 drives the fixing plate 101 to move along the slide groove 102, thereby releasing the sealing ring 10 and the threaded ring 10. The grooved ring 11 is sleeved, and at this time, under the action of the surrounding spring 7, the fixed thread 601 on the outer wall of the closing plug 6 can fit with the inner wall of the threaded ring 11, and then the transmission rod 9 is rotated to start the transmission assembly 8, so that the driving gear 803 drives the center rod 5 to rotate through the connecting gear ring 802, and then the closing plug 6 drives the fixed thread 601 to rotate, and the threaded ring 11 is connected to each other in a rotational connection to achieve combination. At the same time, the rotation of the threaded ring 801 can also make the surrounding spring 7 further squeeze the closing plug 6 to maintain the tightness of its connection, and the operation is very convenient.

[0035] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A backflow preventer structure, comprising a water inlet pipe, characterized in that: One end of the water inlet pipe is connected to the drain pipe, and a drain pipe is provided at the bottom of the water inlet pipe. The interior of the water inlet pipe and the drain pipe are communicated with each other, and a fixed cylinder is provided at the end of the drain pipe away from the water inlet pipe, and a center rod is provided inside the fixed cylinder, and an end of the center rod close to the water inlet pipe is fixedly connected to a closing plug, and an outer wall of the center rod close to the closing plug is surrounded by a surrounding spring, and a transmission assembly is installed in the interior of the fixed cylinder close to the surrounding spring so that a position is provided, and an end of the drain pipe close to the water inlet pipe is fixedly connected to a threaded ring, and a closing ring is sleeved on the inside of the threaded ring, and a rotating assembly is installed around the outer wall of the threaded ring, and a sealing ring is fixedly connected to the inside of the water inlet pipe, and a closing block is provided on the side of the sealing ring close to the drain pipe, and an extrusion assembly is installed at the end of the sealing ring away from the closing block; The transmission assembly includes a threaded ring, a connecting gear ring and a driving gear. The top of the connecting gear ring is meshed with the driving gear. The outer wall of the threaded ring is provided with a thread in a circumferential manner, and one end of the threaded ring is in contact with the surrounding spring. The interior of the threaded ring is slidably connected to the center rod, the interior of the connecting gear ring is slidably connected to the center rod, and the outer wall of the threaded ring is rotatably connected to the inner wall of the fixed cylinder through a thread, and one side of the connecting gear ring is rotatably connected to the interior of the fixed cylinder through a bearing; The outer wall of the fixed cylinder is surrounded by a plurality of fixed rods, and the outer wall of the fixed cylinder near one end of the surrounding spring is connected to a protective sleeve, one end of the protective sleeve is in contact with the closing plug, and a transmission rod is fixedly connected to the position near the edge of the driving gear, and the transmission rod passes through the interior of the fixed rod and is connected to the outside world; The end of the closing plug close to the closing ring is inclined in an arc shape, and a fixed thread is arranged around the outer wall of the end of the closing plug away from the closing ring, and the fixed thread corresponds to the thread on the inner wall of the thread ring. The inside of the sealing ring is inclined toward the side of the extrusion component, and one side of the closing block and the sealing ring fit together to form a truncated cone shape.

2. A backflow preventer structure according to claim 1, characterized in that: The rotating assembly includes a threaded rod, a rotating gear ring and an inner gear ring. The outer wall at the center of the threaded rod is fixedly connected to the rotating gear ring. The interior of the inner gear ring is respectively meshed with multiple rotating gear rings. The two sides of the inner gear ring are respectively rotatably connected to the water inlet pipe and the drain pipe.

3. A backflow preventer structure according to claim 2, characterized in that: The two ends of the threaded rod are rotatably connected to the side walls of the water inlet pipe and the drain pipe respectively. A plurality of fixing plates are arranged around the outer wall of the closed ring. One end of the threaded rod is rotatably connected to the fixing plate through a thread, and a plurality of sliding grooves corresponding to the fixing plates are opened on the inner wall of the water inlet pipe.

4. A backflow preventer structure according to claim 1, characterized in that: The extrusion assembly includes a fixed block, a fixed spring and a pull rod. A fixed spring is arranged around the outer wall of the pull rod away from the sealing ring, and the two ends of the fixed spring are respectively connected to the fixed block and one end of the pull rod. The outer wall of the fixed block is fixed to the inner wall of the water inlet pipe through a metal rod.

5. The backflow preventer structure according to claim 1, characterized in that: The inner top of the drain pipe is funnel-shaped, and a closing cap is provided on the top of the drain pipe. The top of the closing cap is inclined on the side close to the closing block. A filter cover is fixed to the bottom of the closing cap. An extrusion rod is provided at the bottom of the filter cover, and the outer wall of the extrusion rod is connected to the drain pipe through a threaded rotation, and the top of the extrusion rod is T-shaped and contacts the bottom of the filter cover.

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