CN211649179U - Low-resistance backflow preventer - Google Patents

Abstract

The utility model discloses a low resistance backflow preventer. The method comprises the following steps: the valve cover is fixedly arranged on the upper part of the valve body; the water inlet check valve and the water outlet check valve are arranged at two ends of the valve body; the water inlet check valve and the water outlet check valve respectively comprise a valve seat, a sealing seat, a torsional spring, a roller assembly and a spring, the valve seat is arranged on the valve body, the sealing seat is close to the valve seat and is matched with the valve seat to form a sealing opening, the torsional spring and the roller assembly are arranged on the sealing seat, the torsional spring is arranged on one side of the roller assembly, and the spring is arranged on the valve seat; when the valve is in a closed position, the spring force directions generated by the torsion spring and the pressure spring are the same, and the positive closing force of the valve is provided together; after the valve is opened, the axial force of the opened valve is reduced under the action of the torsion spring roller component; meanwhile, the acting force of the torsion spring roller component and the acting force of the spring are mutually offset, so that the fluid loss of the device is further reduced.

Description

Low-resistance backflow preventer

Technical Field

The utility model relates to a backflow preventer technical field, more specifically relates to a low resistance backflow preventer.

Background

The backflow preventer is a fluid control device that strictly limits the unidirectional flow of pressurized water in a pipe.

At present, most backflow preventers on the market are provided with a spring to enable an inner baffle to be in a sealing position. However, this solution also has significant drawbacks: because the force generated by the spring itself causes the internal losses of the device to be faster. The baffle guide rail that adopts is linear type or arc, but is a direction of slant, and when the seal receptacle opened, the gyro wheel moved to a direction along the guide rail, along with the seal receptacle opened, the gyro wheel atress was littleer and smaller, and the control force of valve is less, influences rivers throughput.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to the less problem of dynamics when the valve is opened and shut among the prior art, a low resistance backflow preventer is provided.

The purpose of the utility model is realized through the following technical scheme:

a low resistance backflow preventer, comprising:

the valve body, the valve cover, the water inlet check valve and the water outlet check valve; the valve cover is fixedly arranged on the upper part of the valve body; the water inlet check valve and the water outlet check valve are respectively arranged at two ends of the valve body; the water inlet check valve and the water outlet check valve respectively comprise valve seats, baffles, sealing seats, torsional springs and roller assemblies, the baffles are arranged on the valve seats, guide rails are arranged on the baffles, the sealing seats are elastically connected with the valve seats, the torsional springs and the roller assemblies are arranged on the sealing seats, and the rollers move on the guide rails to drive the sealing seats and the valves to open and close; the guide rail is gradually far away from the central shaft of the baffle towards the opening end.

Further, the water inlet check valve comprises a first valve seat, a first baffle, a first sealing seat, a first torsion spring, a first roller assembly and a first spring, and the water outlet check valve comprises a second valve seat, a second baffle, a second sealing seat, a second torsion spring, a second roller assembly and a second spring;

the first valve seat is arranged in the water inlet check valve, the first baffle plates are arranged at two ends of the water inlet check valve, and first baffle plate guide rails are arranged on the first baffle plates; the first sealing seat is arranged at the downstream of the first valve seat and is matched with the first valve seat and the first baffle plate to form an openable water inlet; the first torsion spring and the first roller assembly are both arranged on the first sealing seat, the first torsion spring is arranged on one side of the first roller assembly, and the first spring is arranged on the first valve seat; the first roller assembly comprises a first roller arm arranged on the first seal seat and a first roller arranged at one end of the first roller arm; the first roller moves on the guide rail to drive the first sealing seat to open and close; one end of the first baffle guide rail is an opening end of the water outlet, the other end of the first baffle guide rail is a closing end of the water outlet, and the guide rail is gradually far away from the central shaft of the baffle towards the opening end;

the second valve seat is arranged in the water outlet check valve, the second baffle is arranged outside the second valve seat, and a second baffle guide rail is arranged on the second baffle; the second sealing seat is arranged at the downstream of the second valve seat and is matched with the second valve seat and the second baffle to form a water outlet which can be opened and closed; the second torsion spring and the second roller assembly are both arranged on the second sealing seat, the second torsion spring is arranged on one side of the second roller assembly, and the second spring is arranged on the second valve seat; the second roller assembly comprises a second roller arm arranged on the second seal seat and a second roller arranged at the end part of the second roller arm; the second roller moves on the second baffle guide rail to drive the second sealing seat to open and close, one end of the second baffle guide rail is a water outlet opening end, the other end of the second baffle guide rail is a water outlet closing end, and the guide rail is gradually far away from the baffle central shaft towards the opening end.

Further, the water inlet check valve further comprises:

the first valve rod and the first spring are arranged at the center of the water inlet check valve, and the first valve rod is sleeved in the first spring;

one end of the first valve rod is provided with a first valve clack, and a first sealing gasket is adhered to the first valve clack.

Further, one end of the first valve rod is provided with a first valve rod sleeve, and the other end of the valve rod is provided with a first flow restrictor.

Further, the water outlet check valve further comprises:

the second valve rod and the second spring are arranged at the center of the water outlet check valve, and the second valve rod is sleeved in the second spring;

and a second valve clack is arranged at one end of the second valve rod, and a second sealing gasket is adhered to the second valve clack.

Further, one end of the second valve rod is provided with a second valve rod sleeve, and the other end of the second valve rod is provided with a second flow restrictor.

Furthermore, an inflection point is arranged on the guide rail, the inflection point gradually leaves away from the central shaft of the baffle plate towards the opening end, and the roller moves towards the opening end at the section to open the water inlet or the water outlet; the inflection point is away from the baffle central axis gradually towards the closing end direction, and the roller moves towards the closing end direction at the section to lock the water inlet or the water outlet.

Further, the first baffle guide rail is U-shaped or V-shaped.

Further, the shape of the second baffle guide rail is U-shaped or V-shaped.

Furthermore, a transition zone is arranged at the inflection point of the guide rail.

Further, the low resistance backflow preventer further comprises:

and the water drain valve is fixedly arranged at the lower part of the valve body.

Compared with the prior art, the beneficial effects are:

the low-resistance backflow preventer is provided with the first roller component, the second roller component, the first torsion spring, the second torsion spring, the first spring and the second spring, the first torsion spring and the second torsion spring can generate acting force to enable the first baffle and the second baffle to be positioned at sealed positions, and the valve seat is provided with the U-shaped roller guide rail, so that torsional spring force can provide closing force when the valve is positioned at a closing section position; when the valve is opened, the baffle is away from the closed section of the switch, and after the baffle enters the opening section, the force of the torsion spring provides the opening force and counteracts the valve closing force of the spring. When the valve is in a closed position, the spring force directions generated by the torsion spring and the spring are the same, and the torsion spring and the spring provide positive closing force for the valve together; after the valve is opened, the axial force of the opened valve is smaller and smaller under the action of the torsion spring roller assembly; meanwhile, the acting force of the torsion spring roller component and the acting force of the spring are mutually offset, so that the fluid loss of the device is further reduced.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the force applied to the valve closure of the present invention;

FIG. 3 is a schematic view of the valve opening force of the present invention;

fig. 4 is a schematic view of the relationship between the guide rail structure and the position of the baffle plate.

Wherein, 1-valve body, 2-valve cover, 3-water inlet check valve, 4-water outlet check valve, 5-water drain cover plate, 31-first valve seat, 32-first baffle, 321-first baffle central axis, 33-first sealing seat, 34-first torsion spring, 35-first roller component, 36-first valve rod, 37-first spring, 38-first valve clack, 39-first sealing gasket, 41-second valve seat, 42-second baffle, 43-second sealing seat, 44-second torsion spring, 45-second roller component, 46-second valve rod, 47-second spring, 48-second valve clack, 39-second sealing gasket, 351-first roller arm, 352-first roller, 353-first baffle guide rail, 361-first valve stem sleeve, 451-second roller arm, 452-second roller, 461-second valve stem sleeve.

Detailed Description

The invention will be further described with reference to specific embodiments, wherein the drawings are designed solely for the purpose of illustration and not as a definition of the limits of the patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be apparent to those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

Examples

As shown in fig. 1 to 3, a low resistance backflow preventer comprising:

the valve comprises a valve body 1, a valve cover 2, a water inlet check valve 3 and a water outlet check valve 4;

the valve cover 2 is fixedly arranged on the upper part of the valve body 1;

the water inlet check valve 3 and the water outlet check valve 4 are respectively arranged at two ends of the valve body 1;

the water inlet check valve 3 is arranged at the water inlet end of the valve body 1 and comprises a first valve seat 31, a first baffle 32, a first sealing seat 33, a first torsion spring 34, a first roller assembly 35, a first valve rod 36, a first spring 37, a first valve clack 38 and a first sealing gasket 39;

the first valve seat 31 is arranged in the water inlet check valve 3, the first baffle 32 is annular and is sleeved at the water inlet part to wrap the first valve seat 31 inside, the first sealing seat 33 is arranged at the downstream of the first valve seat 31, namely, water flows through the downstream of the valve body direction and is matched with the first valve seat 31 and the first baffle 32 to form a water inlet, the first sealing seat 33 is elastically connected to the first valve seat 31, the first sealing seat 33 is attached to the first valve seat 31, the water inlet is closed, the first sealing seat 33 is separated from the first valve seat 31, the water inlet is opened, and water flows through a gap between the first sealing seat 33 and the first valve seat 31; the first torsion spring 34 and the first roller assembly 35 are both disposed on the first seal holder 33, and the first torsion spring 34 is disposed on the side of the first roller assembly 35; first valve rod 36 and first spring 37 all set up 3 central points of the check valve of intaking put, first valve rod 36 cover is established in first spring 37, the one end of first valve rod 36 is connected on first disk seat, and the other end is connected with first valve clack 38, first valve clack 38 is stained with first sealed pad 39, and first valve clack 38 cooperatees with first baffle 32 to first valve clack 38 can contact and close first baffle 32 with first baffle 32 under the effort of first torsional spring 34, and first valve clack 38 still is equipped with first sealed pad 39 sealedly with first baffle 32 contact department moreover.

As shown in fig. 4, the first flap guide 353 is provided along the inner wall of the first flap 32, and the first flap guide 353 has an inflection point 3531, and the portion above the guide inflection point 3531 is gradually spaced from the flap center axis 321, and the portion below the inflection point is also gradually spaced from the flap center axis 321, so that the inflection point is closest to the flap center axis, and both ends of the guide rail are spaced from the center axis. The gyro wheel moves on the guide rail, and when the flex point position, first seal receptacle and first disk seat contact, the gyro wheel crosses the flex point upwards for close the seal receptacle, the gyro wheel is more upwards, and the contact force of first seal receptacle and first disk seat is big more, and the gyro wheel crosses the flex point downwards, is used for opening the seal receptacle, and the gyro wheel is more downwards, and the aperture of first seal receptacle and first disk seat is big more. The inflection point position is equipped with smooth transition area, and the transition area is arcwall face or plane, and the transition area makes the angle of guide rail inflection point mild, and the gyro wheel can pass through the inflection point smoothly, makes the guide rail not have obvious resistance, helps the seal receptacle switching smooth and easy.

The first roller assembly 35 includes: a first roller arm 351 provided on the first seal holder 33; a first roller 352 disposed at one end of the first roller arm 351; the first roller arm 351 is provided at one end thereof with a first barrier guide 353, the first roller 352 is provided on the first barrier guide 353, and the first torsion spring 34 is provided at the other end of the first roller arm 351. The first torsion spring 34 is resiliently biased toward the first roller arm 351, causing the first roller arm 351 to pivot outwardly away from the central axis of the inlet check valve body. The first roller arm 351 is rotated outwards by the force of the first torsion spring 34, and the first sealing seat 33 is pushed to the first valve seat 31 under the action of the guide rail; due to the arrangement of the first baffle guide rail 353, the first roller 352 moves on the first baffle guide rail 353, so that the acting force of the first torsion spring 34 can drive the roller to move away from the central shaft direction when the valve is in the closing section position, and the closing force is provided for the first valve clack 38; when the valve is opened, when the first valve clack 38 leaves the position of the closing section and enters the opening section, the direction of the guide rail is also gradually away from the direction of the central shaft, the acting force of the first torsion spring 34 becomes to provide an opening force for the first valve clack 38, meanwhile, the first roller 352 moves on the first baffle guide rail in the direction opposite to the acting force of the first spring 37 and then offsets the closing force of the first spring 37, in the valve closing state, the axial force of the device is the sum of the magnitude of the first spring force and the magnitude of the axial force of the first torsion spring roller assembly, and in the valve opening state, the axial force of the device is the difference between the magnitude of the first spring force and the magnitude of the axial force of the first torsion spring roller assembly. When the sealing seat is closed, the roller moves upwards through the inflection point of the guide rail, and under the action of the torsion spring, the roller moves on the guide rail towards the direction far away from the central axis of the baffle plate to play a self-locking role; when the sealing seat is opened, the roller moves downwards through the inflection point of the guide rail and moves on the guide rail in the direction far away from the center shaft, and the acting force of the torsional spring is consistent with the direction of the guide rail due to the same acting force of the torsional spring in the direction far away from the center shaft of the baffle, so that the acting force for opening the sealing seat is increased.

The first valve rod 36 is provided with a first valve rod sleeve 361 at one end, the other end of the valve rod is provided with a first flow restrictor (not shown in the figure), the first flow restrictor and the first spring 37 allow the axial movement of the first valve rod 36, but limit the radial movement of the first valve rod 36, due to the action of the first flow restrictor, the axial displacement between the first sealing gasket 39 and the first valve seat 31 is also limited, the first flow restrictor may be a combination of a bolt and a gasket, or other devices that can limit the axial displacement between the first sealing gasket 39 and the first valve seat 31, and is not limited herein.

The water outlet check valve 4 is arranged at the water outlet end of the valve body 1 and comprises a second valve seat 41, a second baffle 42, a second sealing seat 43, a second torsion spring 44, a second roller assembly 45, a second valve rod 46, a second spring 47, a second valve flap 48 and a second sealing gasket 49, the second valve seat 41 is arranged in the water outlet check valve 4, and is arranged on the valve body 1, the second baffle 42 is arranged on the water outlet check valve 4, and encloses a second valve seat 41, said second sealing seat 43 being arranged downstream of said second valve seat 41, the water outlet is formed by matching the second valve seat 41 and the second baffle 42, the second sealing seat 43 is elastically connected to the second valve seat 41, the second sealing seat 43 is attached to the second valve seat 41, the water outlet is closed, the second sealing seat 43 is separated from the first valve seat 41, the water outlet is opened, and water flows through a gap between the second sealing seat 43 and the first valve seat 41; second torsional spring 44 with second roller subassembly 45 all sets up on the second seal receptacle 43, just second torsional spring 44 sets up on second roller subassembly 45 one side, and second valve rod 46 and second spring 47 all set up play water check valve 4 central point puts, second valve rod 46 cover is established in the second spring 47, the one end of second valve rod 46 is connected on the second valve seat, and the other end is provided with second valve clack 48, second valve clack 48 is stained with the second sealed pad 49, and second valve clack 48 cooperatees with second baffle 42 to second valve clack 48 can contact and close second baffle 22 with second baffle 42 under the effort of second torsional spring 44, and second valve clack 48 still is equipped with second sealed pad 49 with second baffle 42 contact department and seals moreover.

The second roller assembly 45 includes: a second roller arm 451 provided on the second seal holder 43; a second roller 452 provided at one end of the second roller arm 451; a second baffle guide rail is arranged at one end of the second roller arm 451, the second roller 452 is arranged on the second baffle guide rail, and the second torsion spring 44 is arranged at the other end of the second roller arm 451. The shape and function of the second baffle guide rail are the same as those of the first baffle guide rail, and are not described in detail.

The second valve rod 46 is provided with a second valve rod sleeve 461 at one end, the other end of the valve rod is provided with a second flow restrictor (not shown), the second flow restrictor and a second spring 47 allow the second valve rod 46 to move axially, but limit the radial movement of the second valve rod 36, due to the action of the second flow restrictor, the axial displacement between the second sealing gasket 49 and the second valve seat 41 is also limited, the second flow restrictor may be a combination of a bolt and a gasket, or other devices that can limit the axial displacement between the second sealing gasket 49 and the second valve seat 41, and is not limited herein.

The lower part of the valve body 1 is also provided with a drain valve 5, the drain valve 5 can also be provided with a pressure detector and a drain valve, when the pressure is detected to be abnormal, the drain valve 5 is automatically opened to drain water or suck air, and the backflow accident is prevented.

In summary, the check valve of the present invention is provided with the roller, the roller arm, the torsion spring, the spring and the guide rail, and the roller moves on the guide rail, so that the acting force of the torsion spring can provide the closing force for the valve flap when the valve is at the closing section position; when the valve is opened, the valve clack is away from the switch closing section position, and after entering the opening section, the acting force of torsional spring then becomes and provides the opening force for the valve clack, and the gyro wheel moves with the opposite direction of the acting force of spring on the guide rail simultaneously, then offsets with the closing force of spring to reduce the fluid and to the loss of device, also can reduce the loss of fluid effect to other parts in the inside, also can make the device use more permanent simultaneously, also need not carry out frequent change yet.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A low resistance backflow preventer, comprising:

the valve body, the valve cover, the water inlet check valve and the water outlet check valve; the valve cover is fixedly arranged on the upper part of the valve body; the water inlet check valve and the water outlet check valve are respectively arranged at two ends of the valve body; the water inlet check valve and the water outlet check valve respectively comprise valve seats, baffle plates, sealing seats, torsional springs and roller assemblies, the baffle plates are arranged on the valve seats, guide rails are arranged on the baffle plates, the sealing seats are elastically connected with the valve seats, the torsional springs and the roller assemblies are arranged on the sealing seats, and the rollers move on the guide rails to drive the sealing seats and the valve seats to open and close; the guide rail is gradually far away from the central shaft of the baffle towards the opening end.

2. The low resistance backflow preventer of claim 1, wherein the water inlet check valve comprises a first valve seat, a first baffle, a first seal seat, a first torsion spring, a first roller assembly and a first spring, and the water outlet check valve comprises a second valve seat, a second baffle, a second seal seat, a second torsion spring, a second roller assembly and a second spring;

the first valve seat is arranged in the water inlet check valve, the first baffle plates are arranged at two ends of the water inlet check valve, and first baffle plate guide rails are arranged on the first baffle plates; the first sealing seat is arranged at the downstream of the first valve seat and is matched with the first valve seat and the first baffle plate to form an openable water inlet; the first torsion spring and the first roller assembly are both arranged on the first sealing seat, the first torsion spring is arranged on one side of the first roller assembly, and the first spring is arranged on the first valve seat; the first roller assembly comprises a first roller arm arranged on the first seal seat and a first roller arranged at one end of the first roller arm; the first roller moves on the guide rail to drive the first sealing seat to open and close; one end of the first baffle guide rail is a water outlet opening end, and the other end of the first baffle guide rail is a water outlet closing end;

the second valve seat is arranged in the water outlet check valve, the second baffle is arranged outside the second valve seat, and a second baffle guide rail is arranged on the second baffle; the second sealing seat is arranged at the downstream of the second valve seat and is matched with the second valve seat and the second baffle to form a water outlet which can be opened and closed; the second torsion spring and the second roller assembly are both arranged on the second sealing seat, the second torsion spring is arranged on one side of the second roller assembly, and the second spring is arranged on the second valve seat; the second roller assembly comprises a second roller arm arranged on the second seal seat and a second roller arranged at the end part of the second roller arm; the second roller moves on the second baffle guide rail to drive the second sealing seat to open and close, one end of the second baffle guide rail is a water outlet opening end, and the other end of the second baffle guide rail is a water outlet closing end.

3. The low resistance backflow preventer of claim 2, wherein the water inlet check valve further comprises:

the first valve rod and the first spring are arranged at the center of the water inlet check valve, and the first valve rod is sleeved in the first spring;

one end of the first valve rod is provided with a first valve clack, and a first sealing gasket is adhered to the first valve clack.

4. The low resistance backflow preventer of claim 3, wherein the first stem is provided with a first stem sleeve at one end and a first restrictor at the other end.

5. The low resistance backflow preventer of claim 1, wherein the water outlet check valve further comprises: the second valve rod and the second spring are arranged at the center of the water outlet check valve, and the second valve rod is sleeved in the second spring; and a second valve clack is arranged at one end of the second valve rod, and a second sealing gasket is adhered to the second valve clack.

6. The low resistance backflow preventer of claim 5, wherein the second valve stem is provided with a second stem sleeve at one end and a second restrictor at the other end.

7. The low resistance backflow preventer of claim 1, wherein the guide track is provided with inflection points that are progressively further away from the central axis of the baffle towards both the open end and the closed end.

8. The low resistance backflow preventer of claim 2, wherein the first flap track is U-shaped or V-shaped, and the second flap track is also U-shaped or V-shaped.

9. The low resistance backflow preventer of claim 8, wherein a transition zone is provided at an inflection point of the first baffle rail or/and the second baffle rail.

10. The low resistance backflow preventer of claim 1, wherein said low resistance backflow preventer further comprises: and the water drain valve is fixedly arranged at the lower part of the valve body.

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