CN219827832U - Backflow prevention valve - Google Patents

Abstract

The utility model provides a backflow prevention valve, and belongs to the technical field of valves. It has been solved and has been assembled inconvenient problem when improving the effect of preventing flowing backwards. The check valve comprises a valve body, wherein the left end of the valve body is a water inlet end, the right end of the valve body is a water outlet end, a first check component and a second check component are arranged in the valve body, the inner diameter of the water inlet end is smaller than that of the middle part of the valve body, the first check component is located in the water inlet end, the second check component is located in the middle part of the valve body, an annular clamping groove I is formed in the water inlet end, the first check component comprises a first shell with an elastic clamping part I located in the clamping groove I and a first check core which is arranged in the first shell and can realize the check function, an annular clamping groove II is formed in the middle part of the valve body, and the second check component comprises a second shell with an elastic clamping part II located in the clamping groove II and a second check core which is arranged in the second shell and can realize the check function. The anti-backflow device has the advantages of good anti-backflow effect, convenience in assembly and the like.

Description

Backflow prevention valve

Technical Field

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

Background

In the water supply pipe, a problem of backflow of the medium is often encountered, and for this reason, it is necessary to connect a backflow prevention valve to the pipe. For example, a meter front backflow preventer disclosed in patent application number 20201932284.5 comprises a main valve body and an auxiliary valve body, wherein the main valve body is in sealing connection with the auxiliary valve body, one end of the main valve body is a liquid inlet end, one end of the auxiliary valve body is a liquid outlet end, a main support is arranged in the main valve body, a main valve flap is matched with the main support, the front end of the main valve flap is provided with a seal, the main valve flap is provided with a main valve spring, a seal ring of the main valve flap is matched with a main valve opening of the liquid inlet end, an auxiliary support is arranged in the auxiliary valve body, an auxiliary valve flap is matched with the auxiliary support, a seal ring is arranged at the rear end of the auxiliary valve flap, an auxiliary valve spring is arranged on the auxiliary valve flap, and the seal ring of the auxiliary valve flap is matched with an auxiliary valve opening of the liquid outlet end; the main valve body and the auxiliary valve body are in sealing connection through a sealing ring, the main support is arranged inside the main valve body in a separated mode, and the auxiliary valve port is arranged on the main support. The double check valve is designed, and has good backflow preventing effect.

However, since the main support is separately arranged inside the main valve body, and the auxiliary valve port is arranged on the main support, which means that the main support has the function of installing the main valve clack and the function of matching with the auxiliary valve clack, special attention is required to be paid to interference and the condition of ensuring that parts are not scattered during assembly, and the problem of inconvenient assembly exists.

Disclosure of Invention

The utility model aims to solve the problems in the prior art, and provides a backflow prevention valve, which solves the problem that the assembly is inconvenient while the backflow prevention effect is improved.

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

the backflow prevention valve comprises a valve body, wherein the left end of the valve body is a water inlet end, the right end of the valve body is a water outlet end, a first check assembly and a second check assembly are arranged in the valve body, the valve body comprises a main body and a valve cap which is in threaded connection with the right end of the main body, the backflow prevention valve is characterized in that the inner diameter of the water inlet end is smaller than that of the middle part of the valve body, the first check assembly is located in the water inlet end, the second check assembly is located in the middle part of the valve body, an annular clamping groove I is formed in the water inlet end, the first check assembly comprises a first shell with an elastic clamping part I located in the clamping groove I and a second check core which is arranged in the first shell and can realize the check function, the second check assembly comprises a second shell with an elastic clamping part II located in the clamping groove II and a second check core which is arranged in the second shell and can realize the check function.

During installation, the first check component and the second check component are sequentially placed into the main body from the right end of the main body, and finally the valve cap is connected to the right end of the main body through threads to form a valve body, so that the first check component is positioned in the water inlet end of the formed valve body, and the second check component is positioned in the middle part of the formed valve body. The backflow prevention valve is characterized in that the first check assembly comprises a first shell, a first elastic clamping part and a first check core, wherein the first elastic clamping part is arranged in the first clamping groove, the first check core is arranged in the first shell and can achieve the check function, the first annular clamping groove is formed in the water inlet end, the second check assembly comprises a second shell, the second elastic clamping part is arranged in the second clamping groove, the second check core is arranged in the second shell and can achieve the check function, the second annular clamping groove is formed in the middle of the valve body, the first check assembly and the second check assembly can be installed and fixed in the valve body in a modularized mode (the first elastic clamping part of the first shell is clamped in the first clamping groove, the first check assembly can be installed and fixed in the water inlet end, the second elastic clamping part of the second shell is clamped in the second clamping groove, the second check assembly can be installed and fixed in the middle of the valve body, the first check assembly and the second check assembly can not interfere with each other, and the assembly convenience of the whole backflow prevention valve is improved.

Meanwhile, the inner diameter of the water inlet end of the backflow prevention valve is smaller than that of the middle part of the valve body, the first check component is fixedly arranged in the water inlet end, the second check component is fixedly arranged in the middle part of the valve body, the size of the first check component is smaller than that of the second check component, and therefore the first check component can be guaranteed not to be clamped in the second clamping groove when the first check component is installed in the water inlet end from right to left.

In the backflow prevention valve, the first blocking shoulder is arranged in the water inlet end, the left end of the first shell abuts against the first blocking shoulder, the second blocking shoulder is arranged in the middle of the valve body, and the left end of the second shell abuts against the second blocking shoulder.

The first retaining shoulder is arranged in the water inlet end, so that the first housing can be blocked by the first retaining shoulder, and the first elastic clamping part can be clamped with the first clamping groove in place. The second blocking shoulder is arranged in the middle of the valve body, so that the second shell can be blocked by the second blocking shoulder, and the second elastic clamping part can be clamped with the second clamping groove in place.

In the backflow prevention valve, the first blocking shoulder and the second blocking shoulder are annular, and a conical surface is connected between the inner wall of the water inlet end and the second blocking shoulder.

Through setting up the conical surface between the end inner wall that intakes and fender shoulder two, can form the guide effect when the back subassembly first is packed into the end of intaking by the tapering of conical surface, guarantee that the back subassembly first can install in place fast.

In the backflow preventing valve, the first elastic clamping part comprises a plurality of first elastic clamping pieces distributed along the circumferential direction of the shell, the left end of each first elastic clamping piece is fixedly connected with the first shell, and the right end of each second elastic clamping piece is obliquely arranged in a direction away from the central line of the first shell and is clamped in the first clamping groove.

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

In the backflow prevention valve, the first check core comprises a first valve core and a first check spring, the first shell comprises a first right half body, a first left half body which is annular and a plurality of first connecting pieces which are uniformly distributed along the circumferential direction and are respectively fixedly connected with the first left half body and the first right half body, the outer diameter of the first right half body is smaller than that of the first left half body, the outer diameter of the first right half body is provided with a taper, the first elastic clamping pieces are positioned at the right end of the first left half body, the first valve core is slidably connected in the first right half body, and the first valve core can extend into the first left half body to form a plug under the action of the first check spring.

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

In the backflow prevention valve, the second elastic clamping part comprises a second elastic clamping piece distributed along the circumferential direction of the second shell, the left end of each second elastic clamping piece is fixedly connected with the second shell, and the right end of each second elastic clamping piece is obliquely arranged in the direction away from the center line of the second shell and clamped in the second clamping groove.

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

In the backflow prevention valve, the second check core comprises a second valve core and a second check spring, the second housing comprises a second right half body, a second left half body which is annular and a plurality of second connecting pieces which are uniformly distributed along the circumferential direction and fixedly connected with the second left half body and the second right half body respectively, the outer diameter of the second right half body is smaller than that of the second left half body, the outer diameter of the second right half body is provided with a taper, each second elastic card is positioned at the right end of the second left half body, the second valve core is connected in the second right half body in a sliding mode, and the second valve core stretches into the second left half body to form a plug under the action of the second check spring.

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

Compared with the prior art, this backflow prevention valve sets up check subassembly one to including the outside have the shell one that is located the elasticity joint portion one of draw-in groove one and locate in the shell one and can realize the check core of check function set up annular draw-in groove one in the end of intaking in the lump, and set up check subassembly two to including the outside have the shell two that is located the elasticity joint portion two of draw-in groove two and locate the check core two of check function and set up annular draw-in groove two in the valve body middle part, make check subassembly one and check subassembly two all can realize the installation of modularization fixed in the valve body, make check subassembly one and check subassembly two's installation fixed can not the mutual interference like this, the equipment convenience of whole backflow prevention valve has been improved when guaranteeing backflow prevention effect.

Drawings

Fig. 1 is a sectional view of the backflow preventing valve.

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

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

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

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

In the figure, 1, a valve body; 1a, a water inlet end; 1b, a water outlet end; 1c, clamping groove I; 1d, a first stop shoulder; 1e, clamping groove II; 1f, a second shoulder; 1g, conical surface; 2. a main body; 3. a valve cap; 4. a first check assembly; 4a, a first shell; 4a1, an elastic clamping part I; 4a11, an elastic card I; 4a2, left half; 4a3, right half one; 4a31, column part one; 4a4, connecting piece I; 4b, a first check core; 4b1, valve core one; 4b11, first rod portion; 4b12, head one; 4b2, check spring one; 4c, a first sealing gasket; 5. a second check assembly; 5a, a second shell; 5a1, an elastic clamping part II; 5a11, an elastic card II; 5a2, left half; 5a3, right half; 5a31, second columnar portion; 5a4, connecting piece two; 5b, a second check core; 5b1, valve core II; 5b11, a second rod part; 5b12, head two; 5b2, a second check spring; and 5c, a second sealing gasket.

Detailed Description

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

As shown in fig. 1, the backflow preventing valve comprises a valve body 1 with a water inlet end 1a at the left end and a water outlet end 1b at the right end, wherein an inner cavity of the valve body 1 is a straight-through type, a first check component 4 and a second check component 5 are arranged in the valve body 1, the water inlet end 1a of the valve body 1 is provided with external threads, and the water outlet end 1b of the valve body 1 is provided with internal threads. Specifically, the valve body 1 includes a main body 2 and a bonnet 3 screwed to the right end of the main body 2, so that the left end of the main body 2 is the water inlet end 1a of the valve body 1, and the bonnet 3 is the right end of the valve body 1, i.e., the water outlet end 1b.

As shown in fig. 1, 2 and 3, the inner diameter of the water inlet end 1a is smaller than the inner diameter of the middle part of the valve body 1, the first check assembly 4 is positioned in the water inlet end 1a, the water inlet end 1a is provided with an annular clamping groove 1c, the first check assembly 4 comprises a shell 4a with an elastic clamping part 4a1 positioned in the clamping groove 1c at the outer side and a first check core 4b which is arranged in the shell 4a and can realize the check function. The water inlet end 1a is internally provided with a first shoulder 1d, and the left end of the first shell 4a is propped against the first shoulder 1 d. The first elastic clamping part 4a1 comprises a plurality of first elastic clamping pieces 4a11 distributed along the circumferential direction of the first shell 4a, the left end of each first elastic clamping piece 4a11 is fixedly connected with the first shell 4a, and the right end of each second elastic clamping piece 5a11 is obliquely arranged in a direction away from the central line of the first shell 4a and clamped in the first clamping groove 1 c. Further, the first check core 4b includes a first valve core 4b1 and a first check spring 4b2, the first housing 4a includes a first right half 4a3, a first left half 4a2 in the shape of a ring, and a plurality of connecting pieces 4a4 circumferentially distributed and respectively fixedly connected to the first left half 4a2 and the first right half 4a3, the outer diameter of the first right half 4a3 is smaller than the outer diameter of the first left half 4a2, the outer diameter of the first right half 4a3 has a taper, each elastic card 4a11 is located at the right end of the first left half 4a2, the first valve core 4b1 is slidably connected in the first right half 4a3, and the first valve core 4b1 can extend into the first left half 4a2 under the action of the first check spring 4b2 to form a sealing plug. Specifically, the right half body 4a3 has a cylindrical portion 4a31 at the center, the valve core 4b1 has a stem portion 4b11 and a head portion 4b12, the stem portion 4b11 is inserted into the cylindrical portion 4a31, the check spring 4b2 is sleeved outside the cylindrical portion 4a31, and both ends of the check spring 4b2 act on the right half body 4a3 and the head portion 4b12, respectively. The left half body I4 a2 is embedded with an annular sealing gasket I4 c, the inner edge of the sealing gasket I4 c protrudes out of the inner wall of the left half body I4 a2, and the head part I4 b12 abuts against the sealing gasket I4 c and seals the central hole of the sealing gasket I.

Further, as shown in fig. 1, 4 and 5, the second check assembly 5 is located in the middle of the valve body 1, an annular clamping groove 1e is formed in the middle of the valve body 1, and the second check assembly 5 includes a second housing 5a having an elastic clamping portion 5a1 located in the clamping groove 1e on the outer side and a second check core 5b disposed in the second housing 5a and capable of realizing a check function. The middle part of the valve body 1 is internally provided with a second blocking shoulder 1f, and the left end of the second shell 5a is propped against the second blocking shoulder 1 f. The first blocking shoulder 1d and the second blocking shoulder 1f are annular, and a conical surface 1g is connected between the inner wall of the water inlet end 1a and the second blocking shoulder 1 f. The second elastic clamping portion 5a1 comprises a plurality of second elastic clamping pieces 5a11 circumferentially distributed along the second shell 5a, the left end of each second elastic clamping piece 5a11 is fixedly connected with the second shell 5a, and the right end of each second elastic clamping piece 5a11 is obliquely arranged in a direction away from the center line of the second shell 5a and clamped in the second clamping groove 1 e. Further, the second check core 5b includes a second valve core 5b1 and a second check spring 5b2, the second housing 5a includes a second right half 5a3, a second left half 5a2 in a ring shape, and a plurality of second connecting pieces 5a4 circumferentially uniformly distributed and respectively fixedly connected with the second left half 5a2 and the second right half 5a3, the outer diameter of the second right half 5a3 is smaller than the outer diameter of the second left half 5a2, the outer diameter of the second right half 5a3 has a taper, each second elastic card 5a11 is located at the right end of the second left half 5a2, the second valve core 5b1 is slidably connected in the second right half 5a3, and the second valve core 5b1 extends into the second left half 5a2 under the action of the second check spring 5b2 to form a seal. Specifically, the center of the right half body 5a3 is provided with a second column portion 5a31, the valve core 5b1 is provided with a second rod portion 5b11 and a second head portion 5b12, the second rod portion 5b11 is arranged in the second column portion 5a31 in a penetrating manner, the second check spring 5b2 is sleeved outside the second column portion 5a31, and two ends of the second check spring 5b2 act on the second right half body 5a3 and the second head portion 5b12 respectively. The second left half body 5a2 is embedded with a second annular sealing gasket 5c, the inner edge of the second sealing gasket 5c protrudes out of the inner wall of the second left half body 5a2, and the second head 5b12 abuts against the second sealing gasket 5c and seals the central hole of the second sealing gasket.

During installation, the first check assembly 4 and the second check assembly 5 are sequentially placed into the main body 2 from the right end of the main body 2, and finally the valve cap 3 is connected to the right end of the main body 2 in a threaded manner to form the valve body 1, so that the first check assembly 4 is positioned in the water inlet end 1a of the formed valve body 1, and the second check assembly 5 is positioned in the middle of the formed valve body 1. The backflow prevention valve comprises a first check assembly 4, a second check assembly 5 and a second check assembly 5, wherein the first check assembly 4 comprises a first shell 4a, which is provided with an elastic clamping part 4a1 positioned in a clamping groove 1c, and a first check core 4b which is arranged in the first shell 4a and can realize a non-return function, the first annular clamping groove 1c is arranged in a water inlet end 1a, the second check assembly 5 comprises a second shell 5a, which is provided with an elastic clamping part 5a1 positioned in a clamping groove 1e, and a second check core 5b which is arranged in the second shell 5a and can realize a non-return function, and an annular clamping groove 1e is arranged in the middle part of a valve body 1, so that the non-return assembly 4 and the second check assembly 5 can be installed and fixed in the valve body 1 in a modularized mode (as long as the elastic clamping part 4a1 of the first shell 4a is clamped in the clamping groove 1c, the whole non-return assembly 4 can be installed and fixed in the water inlet end 1a, as long as the elastic clamping part 5a1 of the second shell 5a is clamped in the clamping groove 1e, the whole non-return assembly 5 can be installed and fixed in the middle part of the valve body 1, and the non-return assembly 5 can not be mutually interfered and fixed.

Meanwhile, in the backflow preventing valve, the inner diameter of the water inlet end 1a is smaller than the inner diameter of the middle part of the valve body 1, the first check component 4 is fixedly arranged in the water inlet end 1a, the second check component 5 is fixedly arranged in the middle part of the valve body 1, the size of the first check component 4 is smaller than that of the second check component 5, and therefore the first check component 4 can be guaranteed to be assembled into the water inlet end 1a from right to left, and the elastic clamping part 4a1 of the side part of the first shell 4a of the first check component 4 cannot be clamped into the clamping groove 1 e.

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

Claims (7)

1. The backflow prevention valve comprises a valve body (1) with a water inlet end (1 a) at the left end and a water outlet end (1 b) at the right end, wherein an inner cavity of the valve body (1) is provided with a first check assembly (4) and a second check assembly (5) in a straight-through type mode and the valve body (1), the valve body (1) comprises a main body (2) and a valve cap (3) which is connected to the right end of the main body (2) in a threaded mode, and the backflow prevention valve is characterized in that the inner diameter of the water inlet end (1 a) is smaller than the inner diameter of the middle of the valve body (1), the first check assembly (4) is located in the water inlet end (1 a), the second check assembly (5) is located in the middle of the valve body (1), an annular clamping groove I (1 c) is arranged in the water inlet end (1 a), the first check assembly (4) comprises a first shell (4 a) with an elastic clamping part (4 a 1) located in the clamping groove I (1 c) on the outer side, and a first check assembly (4 b) capable of realizing a check function is arranged in the outer shell I (4 a), the middle of the valve body (1) is provided with an annular clamping groove II (1 e) and the second check assembly (5 a) is located in the second shell (5 a) and the second shell (5 a) is located in the second shell (5 a) and can realize the check function.

2. The backflow prevention valve according to claim 1, wherein the water inlet end (1 a) is internally provided with a first blocking shoulder (1 d), the left end of the first shell (4 a) is abutted against the first blocking shoulder (1 d), the middle part of the valve body (1) is internally provided with a second blocking shoulder (1 f), and the left end of the second shell (5 a) is abutted against the second blocking shoulder (1 f).

3. The backflow prevention valve according to claim 2, wherein the first blocking shoulder (1 d) and the second blocking shoulder (1 f) are annular, and a conical surface (1 g) is connected between the inner wall of the water inlet end (1 a) and the second blocking shoulder (1 f).

4. A backflow prevention valve according to claim 1, 2 or 3, wherein the first elastic clamping portion (4 a 1) comprises a plurality of first elastic clamping pieces (4 a 11) circumferentially distributed along the first casing (4 a), the left end of each first elastic clamping piece (4 a 11) is fixedly connected with the first casing (4 a), and the right end of each second elastic clamping piece (5 a 11) is obliquely arranged in a direction away from the central line of the first casing (4 a) and is clamped in the first clamping groove (1 c).

5. The backflow preventing valve according to claim 4, wherein the first check core (4 b) comprises a first valve core (4 b 1) and a first check spring (4 b 2), the first housing (4 a) comprises a first right half (4 a 3), a first left half (4 a 2) in a circular ring shape, and a plurality of connecting pieces (4 a 4) circumferentially uniformly distributed and respectively connected with the first left half (4 a 2) and the first right half (4 a 3), the outer diameter of the first right half (4 a 3) is smaller than the outer diameter of the first left half (4 a 2) and the outer diameter of the first right half (4 a 3) has a taper, each elastic card (4 a 11) is located at the right end of the first left half (4 a 2), the first valve core (4 b 1) is slidably connected in the first right half (4 a 3), and the first valve core (4 b 1) can extend into the first left half (4 a 2) under the action of the first check spring (4 b 2) to form a blocking.

6. The backflow prevention valve according to claim 1, 2 or 3, wherein the second elastic clamping portion (5 a 1) comprises a plurality of second elastic clamping pieces (5 a 11) circumferentially distributed along the second outer shell (5 a), the left end of each second elastic clamping piece (5 a 11) is fixedly connected with the second outer shell (5 a), and the right end of each second elastic clamping piece (5 a 11) is obliquely arranged in a direction away from the center line of the second outer shell (5 a) and is clamped in the second clamping groove (1 e).

7. The backflow prevention valve according to claim 6, wherein the second check core (5 b) comprises a second valve core (5 b 1) and a second check spring (5 b 2), the second outer shell (5 a) comprises a second right half (5 a 3), a second left half (5 a 2) in a circular ring shape and a plurality of second connecting pieces (5 a 4) which are circumferentially uniformly distributed and respectively fixedly connected with the second left half (5 a 2) and the second right half (5 a 3), the outer diameter of the second right half (5 a 3) is smaller than the outer diameter of the second left half (5 a 2) and the outer diameter of the second right half (5 a 3) has a taper, each second elastic card (5 a 11) is positioned at the right end of the second left half (5 a 2), the second valve core (5 b 1) is slidably connected in the second right half (5 a 3), and the second valve core (5 b 1) stretches into the second left half (5 a 2) under the action of the second check spring (5 b 2) to form a plug.