CN112797203A

CN112797203A - Check valve core assembly, manufacturing method and straight-flow check valve

Info

Publication number: CN112797203A
Application number: CN202011612932.3A
Authority: CN
Inventors: 顾晓宁; 顾余舜
Original assignee: Nanjing Shangair Machinery Manufacturing Co ltd
Current assignee: Nanjing Shangair Machinery Manufacturing Co ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-05-14

Abstract

The invention discloses a check valve core assembly, a manufacturing method and a straight-flow check valve, wherein the valve core assembly comprises a polygonal tubular valve core and a flow guide plug, the flow guide plug is positioned at the upper end of the polygonal tubular valve core, airflow enters from the lower end of the polygonal tubular valve core, a plurality of through holes are formed in the wall of the polygonal tubular valve core, the airflow enters the through holes and then pushes open a valve plate covered on the through holes along the flow guide plug, and the airflow flows approximately linearly along the tangential direction of the plane of the valve plate, so that the straight-flow check valve is called, and the polygonal tubular valve core is fixedly connected with the. The valve hole valve plate is distributed in the three-dimensional space, so that a larger through flow area is formed, and airflow tangentially flows along the plane of the valve plate when passing through the valve core, so that the airflow flow resistance of the straight-flow check valve is small, and the valve plate is opened and closed quickly; compared with a reciprocating valve core, the valve core has no impact and short closing delay time, which means that the return leakage is greatly reduced, soft sealing is not needed, no noise is generated during working, the reliability is high, and the service life is long.

Description

Check valve core assembly, manufacturing method and straight-flow check valve

Technical Field

The invention relates to the technical field of check valves, in particular to a check valve core assembly of a check valve, a manufacturing method and a straight-flow check valve.

Background

The large reciprocating piston compressor is widely applied and extends to the fields of industry and agriculture, transportation industry, national defense and the like. Has a great position in national economic development. The compressor is often required to continuously run in the production flow, and higher requirements are provided for the safety, reliability and energy conservation of the compressor. The check valve at the outlet of the compressor has the function of preventing the return flow of the output compressed gas. The failure of the compressor can cause the power consumption of the compressor to increase and even endanger the safe operation of the compressor. For a large-sized medium-high pressure compressor, the shape of a non-return element of a traditional check valve is mostly plunger type and cone plug type; the motion modes are reciprocating; the spring is reset, so the valve is called a reciprocating check valve. Because the output airflow pulse of the reciprocating piston compressor has pulsation, the valve core of the check valve has impact noise during working, the valve core is easy to damage, the following performance of the valve core is poor due to the inertia force of the reciprocating valve core, the efficiency is low, and the reverse leakage is large. Moreover, the valve cavity of the check valve in the market is of a pressure fit sealing structure, the valve core is sealed in the valve cavity, the disassembly and the maintenance are difficult for users, once the leakage is serious, only the valve needs to be replaced integrally, and the problem of old and difficult industry is solved.

The check valve has the advantages that the valve core reciprocates, the valve core is vertically opened by air flow when the air flow passes through the valve gap, and the check valve is folded twice and belongs to a backflow check valve. This is the root cause of such check valve problems.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a check valve core assembly, a manufacturing method and a straight-flow check valve; the external connection size of the check valve is consistent with that of the traditional check valve, the traditional reciprocating check valve can be directly replaced, and the pipeline does not need to be changed; meanwhile, the internal structure accords with the working principle of the direct-flow check valve, and the check valve is simple in structure, easy to manufacture and maintain.

The invention provides a check valve core assembly, which comprises a polygonal tubular valve core and a flow guide plug, wherein the flow guide plug is positioned at the upper end of the polygonal tubular valve core, airflow enters from the lower end of the polygonal tubular valve core, a plurality of through holes are formed in the wall of the polygonal tubular valve core, the airflow enters the through holes and then pushes open a valve plate covered on the through holes along the flow guide plug, the airflow flows approximately linearly along the tangential direction of the plane of the valve plate, and the polygonal tubular valve core is fixedly connected with the flow guide plug.

Furthermore, the outer surface of the polygonal tubular valve core is made into a plurality of rectangular side edges which are arranged adjacently, the cross section of the polygonal tubular valve core is a regular polygon, and each side edge is provided with a through flow hole.

Furthermore, the flow guide plug is conical, and the cross section area is gradually increased from bottom to top; the flow guide plug is connected with the polygonal tubular valve core through threads, and is coated with glue and cured.

Furthermore, a valve plate, a pressing sheet and a lift limiting plate are sequentially stacked outside each side edge from inside to outside and fixed on the wall of the polygonal tubular valve core through screws, and the valve plate is sized to cover the through-flow holes.

Furthermore, the valve element assembly further comprises a lift limiting plate fixing ring which is sleeved outside the lift limiting plates and connected with each lift limiting plate through spot welding.

Furthermore, the through-flow hole is a strip-shaped inclined hole, and the joint of the conical surface of the flow guide plug and the inclined plane of the through-flow hole is smooth.

Furthermore, the upper end of the flow guide plug is provided with a shoulder which is matched with a shoulder hole of an internal threaded hole at the upper part of the polygonal tubular valve core, so that the flow guide plug is axially positioned.

In a second aspect of the present invention, a method for manufacturing a check valve core assembly according to any one of the above technical solutions is provided, including the following steps:

s1, connecting the cylindrical valve core with the flow guide plug, and gluing and curing to form a valve core assembly;

s2, forming a plurality of rectangular side edges on the outer surface of the cylindrical valve core by using a machine tool, milling through flow holes, drilling and tapping to

Fixing the valve plate;

s3, finely grinding the rectangular side edges to enable the flatness error to be less than 0.005 mm;

and S4, sequentially penetrating the lift limiting plate, the pressing sheet and the valve sheet through screws, and fixing the lift limiting plate, the pressing sheet and the valve sheet on each rectangular side edge of the polygonal tubular valve core to enable the valve sheet to cover the through-flow holes.

And further comprising a step S5 of sleeving a lift limiting plate fixing ring outside each lift limiting plate and connecting the lift limiting plates with the lift limiting plates in a positioning die through spot welding.

Further, before step S4 is performed, a sheet concave-convex limiting tool block is installed at the through-hole, a convex surface of the sheet concave-convex limiting tool block is located in the through-hole, and a concave surface of the sheet concave-convex limiting tool block is used for accommodating the valve sheet, so that the valve sheet is ensured not to be deviated when the screw is tightened.

In a third aspect of the invention, a straight-flow check valve is provided, which comprises a valve body, at least one valve core assembly according to any one of claims 1 to 7, and a sealing ring, wherein the valve body comprises a connecting cylinder, an upper flange and a lower flange which are respectively positioned at two ends of the connecting cylinder, the valve core assembly is positioned inside the connecting cylinder, and the sealing ring is positioned in a counter bore in the center of the outer end faces of the upper flange and the lower flange.

Furthermore, when a plurality of valve core assemblies are arranged, the plurality of valve core assemblies are arranged in parallel in the corresponding threaded holes on the inner end face of the lower flange, so that the nominal diameter is enlarged, and the requirement of larger ventilation capacity is met.

The novel straight-flow check valve fundamentally changes the movement mode of the valve core, the opening and closing check element (valve plate) of the valve core has elasticity, is arranged at the periphery of the equal polygonal tubular valve core in a three-dimensional space and completely covers the strip-shaped inclined groove hole, airflow tangentially flows through a valve gap of the valve hole along each valve plate plane under the guidance of the flow guide cone, the turning angle is small and is similar to a straight line, so the straight-flow check valve is called, the flow resistance is small, and the valve plate is quickly opened and closed; compared with a reciprocating valve core, the valve core has the advantages of short closing delay time, greatly reduced return leakage, no need of soft sealing, no noise during working, high reliability and long service life. The valve plate integrates the opening and closing element and the spring into a whole, so that the valve plate has light weight and good dynamic characteristic, and the sealing and the reliability of the valve plate are beyond the reach of the traditional structure as long as the accuracy of the polygonal plane of the polygonal tubular valve core and the valve plate is ensured; compared with the traditional backflow check valve, the novel straight-flow check valve has the advantages of lowest flow resistance, lowest reverse leakage, lowest noise, longest service life and convenience in maintenance. This is very advantageous for safe operation and energy saving of large reciprocating piston presses.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a cross-sectional view of a check valve cartridge assembly according to one embodiment of the present invention;

FIG. 2 is a schematic diagram of a structure of a valve plate and a pressing sheet in the embodiment of FIG. 1;

FIG. 3 is a top view of a polygonal tubular valve element having rectangular sides 8;

FIG. 4 is a cross-sectional view of the polygonal tubular valve core of the embodiment of FIG. 3;

FIG. 5 is a cross-sectional view of a straight check valve according to another embodiment of the present invention;

FIG. 6 is a cross-sectional view of the valve body of the embodiment of FIG. 5;

fig. 7 is a sectional view of a direct flow check valve in which a plurality of valve cartridges are connected in parallel according to still another embodiment of the present invention;

FIG. 8 is a top view of the straight check valve of the embodiment of FIG. 7;

description of reference numerals:

the valve comprises a valve core assembly 1, a valve body 2, a sealing ring 3, a polygonal tubular valve core 11, a flow guide plug 12, a valve plate 13, a pressing sheet 14, a lift limiting plate 15, a fastening screw 16, a through flow hole 17, a lift limiting plate fixing ring 18 and a parallel valve core assembly 10.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the terms "comprises" and "comprising," and any variations thereof, in the description and claims of this application and the above-described drawings, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation. Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," "sleeved," and the like are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

Example one

The present embodiment provides a check valve core assembly 1, as shown in fig. 1, including a polygonal tubular valve core 11 and a flow guiding plug 12, where the flow guiding plug 12 is located at the upper end of the polygonal tubular valve core 11, an air flow enters from the lower end of the polygonal tubular valve core 11, a plurality of through holes 17 are opened on the wall of the polygonal tubular valve core 11, after the air flow enters the through holes 17, the flow guiding plug 12 pushes away a valve sheet 13 covered on the through holes 17, and the polygonal tubular valve core 11 and the flow guiding plug 12 are fixedly connected.

The polygonal tubular valve core 11 is a cylinder with a circular hole at the center, and the outer surface of the cylinder is provided with a plurality of identical rectangular side edges, so that the polygonal tubular valve core 11 is seen as a regular polygon from the top. Preferably, the number of the rectangular sides is even, and the following embodiments mainly describe the present embodiment by taking 8 rectangular sides as an example, that is, the cross section of the present embodiment is a regular octagon.

When the straight-flow check valve works, airflow enters the hole of the polygonal tubular valve core 11 from the lower part, pushes the valve plate 13 away along the flow guide plug 12, flows out along the plane of the valve plate 13 in a tangential direction approximately linearly, and has small impact on the valve plate 13. Because the structure of the airflow channel has no sharp bends, the through-flow holes 17 and the valve plates 13 are uniformly distributed in a three-dimensional space, and a valve gap through-flow area far larger than that of a check valve with a traditional structure is formed in an effective space.

Specifically, the outer surface of the polygonal tubular valve core 11 is milled into a plurality of rectangular side edges which are arranged adjacently, and each rectangular side edge is provided with a through flow hole 17. The upper part of the polygonal tubular valve core 11 is provided with internal threads, and a diversion plug 12 with external threads is arranged in the polygonal tubular valve core.

The flow guide plug 12 is conical, and the cross-sectional area is gradually increased from bottom to top. The upper part of the cone of the diversion plug 12 is provided with a cylindrical external thread which is matched with the internal thread of the polygonal tubular valve core 11, the upper end of the external thread is provided with a cylindrical shoulder, and the diameter and the axial length of the external thread are matched with the counter bore shoulder of the polygonal tubular valve core 11, so that the diversion plug 12 is axially positioned; the upper end of the flow guide plug 12 is provided with a hexagonal head for screwing the flow guide plug.

When the polygonal tubular valve core 11 and the flow guide plug 12 are assembled, oil stains on the surfaces of the matched threads need to be cleaned firstly, high-temperature-resistant and high-strength anti-loosening glue is coated, and an assembly is formed after 24H of curing and cannot be separated. Then further processing is carried out, for example, clamping is carried out on the shaft A of the 4-shaft processing center machine tool, 8 rectangular side edges are milled, through flow holes are milled, drilling and tapping are carried out, and the processing is finished under one-time installation; and furthermore, the rectangular side edge is finely ground, so that the plane precision is ensured, and the rectangular side edge has good sealing performance when being covered with the strip valve plate. The accuracy requirement of the flatness of the polygonal rectangular side edge of the assembly is high, and the assembly is a key for success. The structure of the polygonal tubular spool 11 is shown in fig. 3 and 4.

And a valve plate 13, a pressing sheet 14 and a lift limiting plate 15 are sequentially stacked on the outer part of each rectangular side edge from inside to outside and fixed on the rectangular side edge of the polygonal tubular valve core 11 through a fastening screw 16, and the valve plate 13 is sized to cover the through-flow hole 17. The valve plate 13 is made of a valve plate steel strip, and the thickness of the valve plate steel strip can be selected to be 0.6 mm, 0.8 mm and the like. The pressing piece 14 is made of a 0.2 or 0.3 valve plate steel strip optionally, is combined with the valve plate 13 and is arranged between the lift limiting plate 15 and the rectangular side edge, and the size of the valve plate 13 is based on a certain overlapping amount of the valve plate 13 which completely covers the through-flow hole 17. The pressing sheet 14 has the function of protecting the precise valve sheet 13 from being pressed and deformed by the lift limiting plate 15, and simultaneously, the combined valve sheet has the rigidity changing characteristic after being combined with the valve sheet 13, so that the opening and closing are quicker, the closing delay effect is weakened, and the reverse leakage is reduced. The structure of the valve sheet 13 and the pressure sheet 14 is shown in fig. 2.

In a preferred embodiment, the valve core assembly 1 further includes a lift limiting plate fixing ring 18, which is sleeved outside the lift limiting plates 15 and connected with each lift limiting plate 15 through spot welding. Specifically, after the 8 lift limit plates 15 are assembled and corrected, the lift limit plates are firstly installed in a positioning die, then the lift limit plate fixing rings 18 are sleeved, and the 8 lift limit plates 15 are connected into a whole through argon arc welding spot welding. Thus, the valve sheet 13 does not flutter when pushed away from the slapping lift restricting plate 15 by the air flow.

Furthermore, the through-flow hole 17 is a strip-shaped inclined hole, and the joint between the conical surface of the flow guide plug 12 and the inclined surface of the through-flow hole 17 is smooth and has no concave-convex. Any unevenness will cause shock resistance to the high velocity air flow. Therefore, when the inclined surface of the vent hole is milled, the downward movement of the finger-shaped end mill exceeds the hole wall by 1.0-1.5 mm, and the corresponding cone surface is partially cut off a little by using an interpolation instruction along the trend so as to smooth the joint. For this purpose, the axial dimension of the cone connection thread is suitably controlled.

Example two

The invention provides a manufacturing method of a check valve core assembly, which comprises the following steps:

specifically, the center of the cylindrical valve core is a round hole, the upper end of the cylindrical valve core is provided with an internal thread, and a screw hole is provided with a shaft sleeve with a shallow-depth shoulder sinking hole. The lower end of the flow guide plug 12 is a cone, the upper part of the cone is provided with a cylindrical external thread which is matched with the internal thread of the cylindrical valve core, the upper end of the external thread is a cylindrical shoulder, the diameter and the axial length of the external thread are matched with the counter bore shoulder of the cylindrical valve core, and the top of the external thread is provided with a convex cylindrical hexagonal head for a special spanner to screw the thread. And cleaning the thread surfaces of the valve core and the valve core by absolute alcohol, drying the thread surfaces, coating high-temperature-resistant high-strength anti-loosening sealant, and curing for 24 hours to form the valve core assembly. The polygonal tubular valve core assembly is a core part which has higher precision and more complicated structure and ensures the performance of the check valve, and once the polygonal tubular valve core assembly is manufactured, the polygonal tubular valve core assembly cannot be disassembled.

S2, milling a plurality of rectangular side edges, milling through flow holes and drilling and tapping on the outer surface of the cylindrical valve core by using a machine tool to fix the valve plate 13;

specifically, on a CNC machining center machine tool (A shaft), polygon milling, drilling, air channel milling, inclined bottom surface of a channel end milling, drilling and tapping are completed in one-time installation under one-time clamping.

And S3, finely grinding each side edge of the polygon on a flat grinding machine, wherein the flatness is less than 0.005 mm. And finally performing surface rust prevention treatment.

It is to be noted that all the surfaces of the connecting threads must be cleaned by industrial absolute alcohol to remove oil stains, and the surfaces are coated with high-temperature-resistant and high-strength thread anti-loosening sealant after being dried.

And S4, sequentially penetrating the lift limiting plate 15, the pressing plate 14 and the valve plate 13 by using a fastening screw 16, and fixing the lifting limiting plate, the pressing plate 14 and the valve plate 13 on each rectangular side edge of the polygonal tubular valve core 11 so that the valve plate 13 covers the through flow hole 17.

Specifically, the polygonal tubular spool 11 is first screwed to a plate-type tool nut to ensure that the end faces do not protrude after the lift limiting plate 15, the pressing plate 14 and the valve plate 13 are assembled. Fastening screws 16 sequentially penetrate through connecting holes in the lift limiting plate 15, the pressing plate 14 and the valve plate 13, high-temperature-resistant high-strength sealing anti-loosening glue is coated in each screw hole of the polygonal tubular valve element 11, the fastening screws 16 and the three sheet-shaped parts are fastened on the rectangular side edge, the valve plate 13 completely covers a through-flow hole 17 on the side edge of the valve element, and the lower end face of the valve plate should not exceed the lower end face of the polygonal tubular valve element 11. For this purpose, a plate-type tool nut is pre-fastened to the connecting external thread of the polygonal tubular valve core.

Preferably, a concave-convex limiting tool block with a concave convex surface and a concave thin sheet is preassembled in the through-flow hole 17 on the side of the rectangle, the convex surface is embedded in the groove, the width of the valve plate 13 is accommodated in the concave surface, the valve plate 13 is ensured to be installed correctly, and the valve plate 13 does not rotate when the screw is screwed down.

In some specific embodiments, the method further includes step S5, wrapping a lift limiting plate fixing ring 18 around each lift limiting plate 15, and connecting the lift limiting plate fixing ring with the lift limiting plate 15 by spot welding.

According to the polygonal tubular valve core assembled in the steps, the upper ends of 8 lift limiting plates 15 are uniformly opened, the side faces of the valve core are in contact with the hole wall of the lift limiting plate fixing ring, after the valve body 2 is installed, the outer circle of the lift limiting plate fixing ring 18 is matched with a finish-machined hole D in the upper portion of the valve body connecting cylinder 22, and the hole D and the internal thread M are coaxial. The pressing sheet 14 is thin and short, is cushioned between the valve sheet 13 and the lift limiting plate 15, prevents the lift limiting plate 15 from pressing and deforming the precise valve sheet 15, has certain elasticity, and the combined valve sheet has a variable stiffness effect, so that the valve sheet 15 is opened and closed quickly, and the backflow leakage of delayed closing is reduced.

When the straight-flow check valve works, airflow enters the hole of the polygonal tubular valve core 11 from the lower part, pushes the valve plate 13 away along the cone of the flow guide plug, flows out along the plane of the valve plate 13 in a tangential direction approximately linearly, and has small impact on the valve plate 13. Because the structure of the airflow channel has no sharp bends, the through-flow holes 17 and the valve plates 13 are uniformly distributed in a three-dimensional space, and a valve gap through-flow area far larger than that of a check valve with a traditional structure is formed in an effective space.

EXAMPLE III

The third aspect of the invention provides a straight-flow check valve, which comprises a valve body 2, at least one valve core assembly 1 and a sealing ring 3, wherein the valve body 2 comprises a connecting cylinder 22, an upper flange 21 and a lower flange 23 which are respectively positioned at two ends of the connecting cylinder, a hole D at the upper end of the connecting cylinder 22 between the upper flange and the lower flange of the valve body is subjected to finish machining and is coaxial with a connecting threaded hole at the center of the lower flange 23, the center of a thread M at the center of the lower flange 23 is vertical to the inner end surface, the valve core assembly 1 is positioned in the connecting cylinder 22 and is screwed on the inner end of a threaded hole of the lower flange 23, and the excircle of a lift limiting plate fixing ring 18 of the. Two sealing rings 3 are respectively positioned in end surface counter bores of the upper flange 21 and the lower flange 23, as shown in fig. 5 and 6. As long as DN (nominal diameter) and PN (nominal pressure) are the same, the valve body of the straight-flow check valve has the same installation size with the traditional reciprocating backflow check valve body. This facilitates the replacement of the conventional reciprocating check valve with a new straight flow check valve having high reliability without having to change piping. This means that the height of the valve body 2, the structure and the relation dimensions of the upper and lower flanges are the same as those of a conventional check valve, and the selection of the sealing ring 3 conforms to the conventional industry standard. In the embodiment, the upper flange and the lower flange are sealed by adopting the standard O-shaped sealing rings, the sealing performance is reliable, and the structure is simple.

When the number of the valve core assemblies 1 is 1, the assembly process of the straight-flow check valve of the embodiment specifically includes:

cleaning oil stains and pollutants on the matched thread surface by using industrial alcohol, coating anti-loosening sealant, screwing the polygonal valve tubular valve core 11 into a central screw hole of the lower flange 23 of the valve body 2 from the upper end of the inner cavity of the valve body 2, and screwing by using a special wrench.

It should be noted that, a hole D at the upper part of the inner hole of the connecting pipe of the valve body 2 should be finished, it is ensured that the hole D is coaxial with a threaded hole for installing the straight-flow valve core assembly in the lower flange 23, and the dimensional tolerance of the hole D should form a sliding fit with the outer circle of the lift limiting plate fixing ring 18 at the upper end of the straight-flow valve core component, so as to ensure that the far end of the lift limiting plate 15 has reliable positioning and supporting.

When the number of the valve core assemblies 1 is multiple, the multiple valve core assemblies 1 are installed in the corresponding threaded holes of the inner end face of the lower flange in parallel. As shown in fig. 7 and 8, the valve core of the polygonal tubular straight-through check valve in the above embodiment is regular octagon, so that the check valve with various flow rates and pressure levels with large nominal Diameter (DN) can be satisfied by designing flanges and valve bodies with different sizes and pressure levels. For example, when DN ═ 65, 3 octagonal tubular direct current valve cores can be adopted and mounted on a valve plate in parallel to form a parallel combined direct current check valve. The modularized design adopts 1-2 straight-flow valve cores which are connected in parallel in a limited space to form a larger valve hole and a larger valve gap flow area so as to meet various requirements of larger flow. The basic structure and the working principle are not changed.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. The utility model provides a check valve case subassembly, its characterized in that, the case subassembly includes polygon tubulose case and water conservancy diversion stopper, the water conservancy diversion stopper is located polygon tubulose case upper end, the air current by polygon tubulose case lower extreme gets into, it has a plurality of through-flow holes to open on the polygon tubulose case wall, and the air current gets into follow behind the through-flow hole the water conservancy diversion stopper is pushed aside the valve block that covers on the through-flow hole, along the approximate straight line of valve block plane tangential flow, polygon tubulose case with water conservancy diversion stopper fixed connection.

2. A check valve cartridge assembly according to claim 1, wherein the outer surface of said polygonal tubular cartridge is formed as a plurality of adjacently disposed rectangular sides, said polygonal tubular cartridge having a cross-section in the form of a regular polygon, each of said sides being formed with a flow aperture.

3. The check valve cartridge assembly of claim 1 or 2, wherein the lower portion of the deflector plug is tapered with a gradually increasing cross-sectional area from bottom to top; the flow guide plug is connected with the polygonal tubular valve core through threads, and is coated with glue and cured.

4. The check valve core assembly of claim 2, wherein a valve plate, a pressing plate and a lift limiting plate are stacked on the outer portion of each side edge from inside to outside and fixed on the side wall of the polygonal tubular valve core through screws, and the valve plate is sized to cover the through-flow holes.

5. The check valve spool assembly of claim 2, further comprising a lift limiting plate retainer ring sleeved outside the lift limiting plates and connected to each lift limiting plate by spot welding.

6. The check valve cartridge assembly of claim 3, wherein the flow orifice is a slanted bar-shaped orifice, and the tapered surface of the flow plug is flush with the slanted surface of the flow orifice.

7. The check valve cartridge assembly of claim 3, wherein the deflector upper end is provided with a shoulder that mates with a shoulder hole of an internally threaded orifice in the upper portion of the polygonal tubular cartridge to axially locate the deflector.

8. A method of making a check valve cartridge assembly according to any one of claims 1 to 7, including the steps of:

s2, processing a plurality of rectangular side edges, through-flow holes and drilling tapping on the outer surface of the cylindrical valve core by using a machine tool so as to fix the valve plate;

9. The method for manufacturing a check valve core assembly according to claim 8, further comprising a step S5 of sleeving a lift limiting plate fixing ring outside each lift limiting plate and connecting the lift limiting plate fixing ring with the lift limiting plate through spot welding.

10. The method for making a check valve core assembly according to claim 8, further comprising, before performing step S4, S3' of installing a thin sheet concave-convex limiting tool block at the through-hole, wherein the convex surface of the thin sheet concave-convex limiting tool block is located in the through-hole, and the concave surface of the thin sheet concave-convex limiting tool block is used for accommodating the valve sheet.

11. A straight-through check valve comprising a valve body, at least one valve core assembly according to any one of claims 1 to 7, and a sealing ring, wherein the valve body comprises a connecting cylinder, an upper flange and a lower flange which are respectively arranged at two ends of the connecting cylinder, the valve core assembly is arranged in the connecting cylinder, and the sealing ring is arranged in a counter bore on the outer end surface of the upper flange and the lower flange.

12. The straight-flow check valve according to claim 11, wherein when there are a plurality of valve core assemblies, the plurality of valve core assemblies are installed in parallel in corresponding threaded holes on the inner end surface of the lower flange.