CN112361040B

CN112361040B - Check valve

Info

Publication number: CN112361040B
Application number: CN202110039383.3A
Authority: CN
Inventors: 王誉霖; 葛波; 尹彦章; 王翠
Original assignee: Weichai Power Qingzhou Transmission Control Technology Co ltd; Weichai Power Co Ltd
Current assignee: Weichai Power Qingzhou Transmission Control Technology Co ltd; Weichai Power Co Ltd
Priority date: 2021-01-13
Filing date: 2021-01-13
Publication date: 2021-04-16
Anticipated expiration: 2041-01-13
Also published as: CN112361040A

Abstract

The invention provides a check valve. The check valve comprises a valve body and a valve core assembly, wherein the valve body is provided with a central channel, the central channel comprises a beam portion, an inlet portion and an outlet portion, the inlet portion and the outlet portion are respectively positioned at two ends of the beam portion, and the inner diameter of the beam portion is smaller than that of the outlet portion and that of the inlet portion; the valve core assembly comprises a supporting sheet, a guide cylinder, a plurality of supporting rod assemblies, blades, a driving shaft and the like, wherein the supporting sheet is provided with an overflowing hole and is fixed at the beam portion, and a sealing film is arranged on the side surface of one side, close to the outlet portion, of the supporting sheet. So set up the fluid that makes reverse inflow and drive the drive shaft rotation through the blade, drive the relative guide cylinder of bracing piece subassembly through the drive shaft and move to entering portion for seal membrane week side and restraint a lateral wall butt, thereby reach the purpose that prevents fluid reverse flow, restraint a diameter less and make the velocity of flow increase, even the less pipeline of fluid pressure also can drive the seal membrane and seal, and need not manual regulation in the use, work efficiency is high.

Description

Check valve

Technical Field

The invention relates to the technical field of valves, in particular to a check valve.

Background

Hydraulic transmission systems are increasingly used in the manufacturing and construction industries due to their advantages of excellent control performance, wide adaptability, low cost, etc. A complete hydraulic transmission system consists of five parts, namely a power element, an execution element, a control element, an auxiliary element and hydraulic oil. The hydraulic valve is used as a control element in the hydraulic transmission system, and the flow direction, pressure and flow of hydraulic oil in the hydraulic transmission system are controlled to meet the requirement of the working performance of an execution element in the hydraulic transmission system.

In the actual production process, the problem of hydraulic oil backflow often occurs, the hydraulic oil backflow not only affects the operation of an execution element, but also the backflow hydraulic oil carries impurities to damage the element in the hydraulic transmission system. Check valves are commonly installed in existing hydraulic transmission systems to prevent the reverse flow of the medium. Specifically, under the action of fluid pressure flowing in one direction, a valve clack of the one-way valve is opened; when the fluid flows in the reverse direction, the valve clack of the one-way valve is closed under the action of the fluid pressure, so that the fluid cannot flow backwards.

However, in a pipeline with low fluid pressure, the valve flap cannot be completely closed due to the low fluid pressure, so that the fluid can still flow backwards, and the working process is influenced.

Disclosure of Invention

The invention provides a check valve, which aims to solve the technical problem that in the prior art, the valve clack of a check valve in a pipeline with lower fluid pressure cannot be completely closed, so that fluid can still flow back.

In order to solve the technical problems, the invention adopts the following technical scheme:

the present invention provides a check valve, comprising: the valve body is provided with a central channel, the central channel comprises a beam portion, an inlet portion and an outlet portion, the inlet portion and the outlet portion are respectively located at two ends of the beam portion, and the inner diameter of the beam portion is smaller than that of the outlet portion and that of the inlet portion; the valve core assembly comprises a supporting sheet, a supporting frame and a driving part, wherein the supporting sheet is provided with an overflowing hole and is fixed at the beam flow part, and a sealing film is arranged on the side surface of one side, close to the outlet part, of the supporting sheet; the supporting frame comprises a guide cylinder and a plurality of supporting rod assemblies, a first end of the guide cylinder is connected with the sealing film, and a second end of the guide cylinder is provided with an internal thread part; a plurality of guide openings extending in the axial direction are arranged between the internal thread part and the sealing film, and the plurality of guide openings are arranged at intervals along the circumferential direction of the guide cylinder; the driving part comprises a blade and a driving shaft, the first end of the driving shaft is fixedly connected with the blade, and the second end of the driving shaft is provided with an external thread part in threaded connection with the internal thread part; the second end of the driving shaft is connected with a connecting column through a bearing, one end of the connecting column, which is far away from the bearing, is connected with a movable plate, and the movable plate is connected with the first end of the supporting rod assembly; the second end of the support rod assembly passes through the guide opening and is connected with the sealing film; when the fluid flows from the inlet part to the outlet part, the fluid presses the sealing membrane from the overflowing hole to move the supporting rod assembly along the guide opening towards the outlet part, so that the peripheral side surface of the sealing membrane and the lateral wall of the beam flow part form a flow passage; when the fluid flows from the outlet part to the inlet part, the fluid drives the driving shaft to rotate through the blades, so that the driving shaft drives the supporting rod assembly to move towards the inlet part relative to the guide cylinder, and the peripheral side surface of the sealing membrane is in butt joint with the side wall of the beam flow part for sealing.

As an improvement of the check valve of the present invention, the support sheet is located at one end of the beam portion close to the inlet portion.

As an improvement of the check valve of the invention, one end of the internal thread part close to the outlet part is provided with a limit ring; and a matching ring matched with the limiting ring is arranged at one end of the external thread part close to the outlet part, and when the matching ring is matched with the limiting ring, the driving shaft rotates relative to the guide cylinder.

As an improvement of the check valve, the support rod assembly comprises a support rod and a press rod, wherein a first end of the support rod is hinged to the moving plate, a second end of the support rod is hinged to the press rod, and the press rod is connected with the sealing film.

As an improvement of the check valve, one side of the sealing membrane, which is far away from the supporting sheet, is provided with an elastic connecting disc, and the elastic connecting disc is fixedly connected with the guide cylinder; the sealing film is circular; the compression bar extends along the radial direction of the sealing film, and the outer end of the compression bar is connected with the sealing film; the fluid by the entering part flow direction when the exit portion, the fluid is followed the discharge orifice extrusion the seal membrane, the inner extrusion of depression bar the elastic connection dish orientation the centre of a circle of seal membrane removes, the bracing piece is followed the direction opening orientation exit portion removes.

As an improvement of the check valve, the pressure rod is provided with at least one sleeve joint part, the sealing membrane is provided with a connecting sleeve, and the connecting sleeve is sleeved outside the sleeve joint part.

As an improvement of the check valve of the invention, the beam portion is provided with a connecting portion, and the inner diameter of a first end of the connecting portion is larger than that of a second end of the connecting portion; the seal membrane sets up the first end of connecting portion, just the external diameter of seal membrane with the internal diameter of the first end of connecting portion equals.

As an improvement of the check valve of the present invention, an elastic member is further disposed in the first end of the guide cylinder, the first end of the elastic member is connected to the sealing film, and the second end of the elastic member is connected to the moving plate.

As an improvement of the check valve, the check valve further comprises a first fixing frame fixedly connected with the beam portion, the first fixing frame is provided with a first supporting channel, the first supporting channel is sleeved on the outer side of the guide cylinder, the first fixing frame is located between the blade and the guide opening, and the first fixing frame is further provided with a first overflowing channel.

As an improvement of the check valve, the check valve further comprises a second fixing frame fixedly connected with the beam portion, the second fixing frame is provided with a second overflowing channel, and the second fixing frame is fixedly connected with the support sheet through a connecting rod.

The check valve provided by the invention comprises a valve body and a valve core assembly, wherein the valve body is provided with a central channel, the central channel comprises a beam portion, an inlet portion and an outlet portion, the inlet portion and the outlet portion are respectively positioned at two ends of the beam portion, and the inner diameter of the beam portion is smaller than that of the outlet portion and that of the inlet portion, so that the flow speed of fluid entering the beam portion is accelerated. Specifically, the valve core assembly comprises a supporting sheet, a supporting frame and a driving part, wherein the supporting sheet is provided with an overflowing hole and is fixed at the beam portion, and a sealing film is arranged on the side surface of one side, close to the outlet portion, of the supporting sheet; the supporting frame comprises a guide cylinder and a plurality of supporting rod assemblies, the first end of the guide cylinder is connected with the sealing film, and the second end of the guide cylinder is provided with an internal thread part; a plurality of guide openings extending along the axial direction are arranged between the internal thread part and the sealing film, and the plurality of guide openings are arranged at intervals along the circumferential direction of the guide cylinder; the driving part comprises a blade and a driving shaft, the first end of the driving shaft is fixedly connected with the blade, and the second end of the driving shaft is provided with an external thread part in threaded connection with the internal thread part; the second end of the driving shaft is connected with a connecting column through a bearing, one end of the connecting column, which is far away from the bearing, is connected with a movable plate, and the movable plate is connected with the first end of the supporting rod assembly; the second end of the support rod assembly passes through the guide opening and is connected with the sealing membrane. When the fluid flows from the inlet part to the outlet part in the forward direction, the fluid extrudes the sealing membrane from the overflowing hole to enable the supporting rod assembly to move towards the outlet part along the guide opening, so that the peripheral side surface of the sealing membrane and the side wall of the beam part form a flow passage, namely the check valve is in an open state, the fluid can enter the outlet part from the inlet part through the flow passage of the beam part, and the fluid can pass through the check valve; when fluid reversely flows from the outlet part to the inlet part, the fluid drives the driving shaft to rotate through the blades, so that the driving shaft drives the supporting rod assembly to move towards the inlet part relative to the guide cylinder, the peripheral side surface of the sealing membrane is in butt joint with the side wall of the beam flow part to be sealed, namely, the check valve is in a closed state, and the fluid cannot pass through the check valve. So set up, utilize the fluid in the pipeline as power supply drive driver part, make driver part can follow the axial round trip movement of guide cylinder, realize opening and closing of check valve, need not the manual work and adjust the check valve, just can reach one-way circulation's effect, work efficiency is high.

In addition to the technical problems solved by the present invention, the technical features constituting the technical solutions, and the advantages brought by the technical features of the technical solutions described above, other technical problems solved by the check valve provided by the present invention, other technical features included in the technical solutions, and advantages brought by the technical features will be further described in detail in the detailed description of the embodiments.

Drawings

In order to illustrate embodiments of the invention or prior art solutions more clearly, the drawings that are needed in the description of the embodiments of the invention or prior art will be briefly described below, it being understood that the drawings in the following description are only some embodiments of the invention, and that these drawings and the written description are not intended to limit the scope of the disclosed concept in any way, but rather to illustrate it to those skilled in the art by reference to specific embodiments, and that other drawings may be obtained by those skilled in the art without inventive effort.

Fig. 1 is a schematic view of an installation structure of a valve body according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a check valve according to an embodiment of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2;

FIG. 4 is a schematic view of a connection structure of a sealing film and a supporting frame according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a support rod assembly according to an embodiment of the present invention.

Description of reference numerals:

1: a valve body; 11: a central channel; 12: a beam portion; 121: a connecting portion; 13: an inlet portion; 14: an outlet portion; 2: a valve core assembly; 3: a support sheet; 31: a sealing film; 32: an elastic connecting disc; 33: connecting sleeves; 41: a guide cylinder; 411: a guide opening; 42: a support rod assembly; 421: a support bar; 422: a pressure lever; 423: a socket joint part; 51: a blade; 52: a drive shaft; 53: a bearing; 54: connecting columns; 55: moving the plate; 56: an elastic member; 6: a first fixing frame; 7: a second fixing frame; 71: a connecting rod; 8: a first pipe joint; 9: a second pipe joint.

Detailed Description

In the prior art, a check valve is usually installed in a hydraulic transmission system to prevent fluid from flowing backwards, however, for a pipeline with low fluid pressure, the valve flap of the check valve cannot be completely closed due to low fluid pressure, so that the fluid can still flow backwards, and the working process is affected.

In view of the above, the present invention provides a check valve, in which a fluid flowing from an outlet portion to an inlet portion in a reverse direction is driven by a blade to rotate in a reverse direction, and a support rod assembly is driven by the drive shaft to move toward the inlet portion relative to a guide cylinder, so that a peripheral side surface of a sealing membrane is abutted against a side wall of a beam portion to achieve sealing.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

Fig. 1 is a schematic view of an installation structure of a valve body according to an embodiment of the present invention; FIG. 2 is a schematic structural diagram of a check valve according to an embodiment of the present invention; fig. 3 is a partially enlarged view of a in fig. 2.

Referring to fig. 1 to 3, an embodiment of the present invention provides a check valve, which includes a valve body 1 and a valve core assembly 2, where the valve body 1 is provided with a central channel 11, the central channel 11 includes a beam portion 12, and an inlet portion 13 and an outlet portion 14 respectively located at two ends of the beam portion 12, and inner diameters of the beam portion 12 are both smaller than inner diameters of the outlet portion 14 and the inlet portion 13.

The valve body 1 is in a circular tube shape, is simple in structure and is conveniently connected with a pipeline in a hydraulic transmission system. Two ends of the valve body 1 are respectively communicated with a liquid inlet pipe and a liquid outlet pipe in a hydraulic transmission system, and the connection mode can be flange connection, threaded connection and the like. As shown in fig. 1, a first pipe joint 8 and a second pipe joint 9 can be further respectively arranged at two ends of the valve body 1, the valve body 1 is connected with the liquid inlet pipe through the first pipe joint 8, and the valve body 1 is connected with the liquid outlet pipe through the second pipe joint 9.

A central channel 11 is arranged along the central axis of the valve body 1, one end of the central channel 11 close to the liquid inlet pipe is an inlet part 13, one end of the central channel 11 close to the liquid outlet pipe is an outlet part 14, and a beam part 12 is arranged between the outlet part 14 and the inlet part 13. The inner diameters of the beam portion 12 are smaller than those of the outlet portion 14 and the inlet portion 13, the inner diameter of the outlet portion 14 may be equal to that of the inlet portion 13, the inner diameter of the outlet portion 14 may be larger than that of the inlet portion 13, and the inner diameter of the outlet portion 14 may also be smaller than that of the inlet portion 13. Alternatively, the outlet portion 14 may have an inner diameter equal to that of the inlet portion 13, which facilitates machining. The lengths of the outlet 14, the inlet 13, and the beam portion 12 may be equal or different, for example, the lengths of the outlet 14, the inlet 13, and the beam portion 12 are equal; for another example, the outlet portion 14 and the inlet portion 13 are equal in length and are both smaller than the beam portion 12; for example, the beam portion 12 has the longest length, the exit portion 14 has the next longest length, and the entrance portion 13 has the shortest length.

Referring to fig. 3, the valve core assembly 2 includes a support sheet 3, a support frame and a driving component, the support sheet 3 is provided with an overflow hole, the support sheet 3 is fixed at the beam portion 12, and a sealing film 31 is arranged on a side surface of the support sheet 3 near the outlet portion 14; the support frame comprises a guide cylinder 41 and a plurality of support rod assemblies 42, wherein a first end of the guide cylinder 41 is connected with the sealing film 31, and a second end of the guide cylinder 41 is provided with an internal thread part; a plurality of guide openings 411 extending in the axial direction are provided between the internal thread portion and the seal film 31, and the plurality of guide openings 411 are provided at intervals in the circumferential direction of the guide cylinder 41; the driving part comprises a blade 51 and a driving shaft 52, a first end of the driving shaft 52 is fixedly connected with the blade 51, and a second end of the driving shaft 52 is provided with an external thread part in threaded connection with the internal thread part; a second end of the driving shaft 52 is connected with a connecting column 54 through a bearing 53, one end of the connecting column 54 far away from the bearing 53 is connected with a moving plate 55, and the moving plate 55 is connected with a first end of the supporting rod assembly 42; the second end of the support rod assembly 42 is coupled to the sealing film 31 through the guide opening 411.

The support sheet 3 of the valve core assembly 2 may be a circular plate, and the circumferential side surface of the circular plate is fixedly connected with the side wall of the beam portion 12, and the connection mode may be welding, bonding, and the like. The support plate 3 is provided with an overflowing hole which can be a circular hole, a square hole and the like. The number of the overflowing holes can be one, and the number of the overflowing holes can also be multiple, such as four, ten and the like; optionally, the plurality of overflowing holes are arranged at intervals along the circumferential direction of the support plate. The shape, the number and the arrangement mode of the overflowing holes are not limited in the embodiment of the invention.

A sealing film 31 is arranged on the side surface of the supporting sheet 3 near the outlet part 14, and the sealing film 31 can be a circular rubber sheet. When the fluid flows from the inlet 13 to the beam portion 12 in the forward direction, the fluid presses the sealing film 31 to separate the sealing film 31 from the support sheet 3 and separate the sealing film 31 from the side wall of the beam portion 12 when the fluid passes through the overflowing hole, and the fluid can flow in the forward direction. When the fluid flows from the outlet portion 14 to the flow restricting portion 12 in the reverse direction, the sealing film 31 abuts against the support piece 3, and the support piece 3 serves to support the sealing film 31.

Optionally, the area of the sealing film 31 is larger than that of the support sheet 3, and when fluid reversely flows from the outlet portion 14, the circumferential side surface of the sealing film 31 abuts against the side wall of the beam portion 12, so that the sealing performance of the check valve is further improved.

The guide cylinder 41 of the support frame, optionally, the guide cylinder 41 is a circular cylinder. The first end face of the guide cylinder 41 may be bonded to the seal film 31. The second end of the guide cylinder 41 is provided with an internal thread part, and the internal thread of the internal thread part in the embodiment can be a left-handed thread or a right-handed thread; the internal thread in this embodiment may be a triangular thread, a rectangular thread, or the like. This embodiment is not limited to this.

Fig. 4 is a schematic view of a connection structure of a sealing film and a supporting frame according to an embodiment of the present invention, and referring to fig. 4, a plurality of guide openings 411 extending in an axial direction are provided between the internal thread portion of the guide cylinder 41 and the sealing film 31, and the number of the guide openings 411 may be two, three, four, and the like. Optionally, the guide opening 411 is a rectangular opening, the length direction of the rectangular opening is the axial direction of the guide cylinder 41, and the plurality of rectangular openings are uniformly arranged at intervals along the circumferential direction of the guide cylinder 41, so that when the driving shaft 52 extrudes the sealing film 31 through the supporting rod assembly 42, the sealing film 31 can be uniformly stressed along the circumferential direction, and the circumferential side surface of the sealing film 31 is abutted to the beam portion 12.

The vanes 51 of the driving member, optionally, the vanes 51 are curved, and the concave surface of the vanes 51 faces the outlet portion 14, so as to facilitate the vanes 51 to rotate reversely under the action of the fluid flowing reversely into the stream portion 12 from the outlet portion 14. The number of the blades 51 may be plural, and the plural blades 51 are arranged at regular intervals in the circumferential direction of the drive shaft 52. The blades 51 are fixedly connected to the first end of the driving shaft 52 in various ways, for example, a plurality of blades 51 are directly welded to the driving shaft 52; for another example, the plurality of blades 51 are first welded to a hollow cylinder, and then the hollow cylinder provided with the plurality of blades 51 is fitted over the drive shaft 52, and so on.

The second end of the driving shaft 52 is provided with an external thread part screwed with the internal thread part, and the external thread type of the external thread part corresponds to the internal thread of the internal thread part, so that the external thread part and the internal thread part can be smoothly connected, for example, when the internal thread is a left-handed thread, the external thread is also a left-handed thread; for another example, when the internal threads are triangular threads, the external threads are also triangular threads, and so on.

The second end of the driving shaft 52 is connected with a connecting column 54 through a bearing 53, one of the inner ring and the outer ring of the bearing 53 is connected with the driving shaft 52, the other of the inner ring and the outer ring of the bearing 53 is connected with the connecting column 54, the bearing 53 can transmit the axial force of the driving shaft 52 to the connecting column 54, so that the supporting rod assembly 42 is driven to move through the connecting column 54 and the moving plate 55, the balls of the bearing 53 consume the rotation of the driving shaft 52, and the connecting column 54 is prevented from rotating under the driving of the driving shaft 52. Optionally, the bearing 53 is a deep groove ball bearing 53, which is not only suitable for a high-speed environment, but also has simple design and long service life.

The second end of the connecting column 54 is connected to the moving plate 55 by welding, bonding, or the like. Optionally, the moving plate 55 is cylindrical. Set up first hinge hole at the first end of bracing piece subassembly 42, be provided with articulated piece on the lateral wall of movable plate 55, the first end welding of articulated piece is on the lateral wall of movable plate 55, and the second end of articulated piece is provided with the second hinge hole, makes movable plate 55 be connected with bracing piece subassembly 42 through wearing to establish the pivot in first hinge hole and second hinge hole.

By providing the bearing 53, the connecting column 54 and the moving plate 55, when the fluid drives the driving shaft 52 to rotate through the vane 51, the driving shaft 52 drives the connecting column 54 and the moving plate 55 to move towards the inlet portion 13 through the bearing 53 without rotating, that is, the supporting rod assembly 42 only moves in the axial direction of the guide cylinder 41, so as to prevent the supporting rod assembly 42 from rotating and being damaged. In this way, the drive shaft 52 can drive the support rod assembly 42 towards the sealing membrane 31 to stretch the sealing membrane 31 so that the circumferential side of the sealing membrane 31 abuts against the side wall of the stem 12, thus preventing the reverse flow of fluid; or the driving shaft 52 can drive the supporting rod assembly 42 to move away from the sealing membrane 31 to gather the sealing membrane 31, so that the flow passage between the sealing membrane 31 and the side wall of the beam portion 12 is further enlarged, thereby facilitating the forward flow of the fluid.

The supporting rack further comprises a plurality of supporting rod assemblies 42, the number of the supporting rod assemblies 42 can be two, three, four, etc., and the number of the supporting rod assemblies 42 is the same as that of the guiding openings 411. The second end of the support rod assembly 42 is connected to the sealing film 31 through the guide opening 411 by welding, bonding, hinging, or the like. The support rod assembly 42 may include a plurality of connecting rods, one of which is connected to the second end of the drive shaft 52 and the other of which is connected to the sealing membrane 31 to expand or contract the sealing membrane 31 to change the connection of the sealing membrane 31 to the side wall of the stem portion 12.

The working principle of the check valve of the present invention will be described in detail below in conjunction with the above-described structure.

When the fluid flows from the inlet 13 to the outlet 14, the fluid presses the sealing film 31 from the overflowing hole to move the supporting rod assembly 42 along the guide opening 411 to the outlet 14, so that the peripheral side surface of the sealing film 31 forms a flow channel with the side wall of the beam portion 12; when the fluid reversely flows from the outlet part 14 to the inlet part 13, the fluid drives the driving shaft 52 to reversely rotate through the blades 51, so that the driving shaft 52 drives the supporting rod assembly 42 to move relative to the guide cylinder 41 to the inlet part 13, and the peripheral side surface of the sealing film 31 is abutted and sealed with the side wall of the beam current part 12.

For the forward flow of the fluid, that is, when the fluid flows from the inlet 13 to the outlet 14, the fluid enters the beam portion 12 from the inlet 13, the cross-sectional area of the flow becomes smaller, so that the flow rate of the fluid is increased, the fluid presses the sealing film 31 through the overflowing holes on the supporting sheet 3, so that the sealing film 31 is separated from the supporting sheet 3, the peripheral side surface of the sealing film 31 is separated from the side wall of the beam portion 12, that is, a flow passage is formed, and the fluid can flow from the inlet 13 to the outlet 14; the support rod assembly 42 moves toward the outlet portion 14 along the guide opening 411 on the one hand, and the fluid rotates the drive shaft 52 in the forward direction by the vane 51 on the other hand, thereby moving the drive shaft 52 toward the outlet portion 14.

For the reverse flow of the fluid, that is, when the fluid flows from the outlet portion 14 to the inlet portion 13, the fluid enters the beam portion 12 from the outlet portion 14, the cross-sectional area of the flow is reduced, so that the flow velocity of the fluid is increased, the fluid impacts the blades 51 to make the driving shaft 52 rotate reversely, the driving shaft 52 is in threaded connection with the guide cylinder 41, the driving shaft 52 can move axially towards the inlet portion 13 relative to the guide cylinder 41 while rotating reversely, the driving shaft 52 simultaneously drives the support rod assembly 42 to move towards the inlet portion 13, the support rod assembly 42 expands the seal membrane 31, so that the peripheral side surface of the seal membrane 31 is abutted against the side wall of the beam portion 12, the flow channel is blocked, the fluid is prevented from flowing from the outlet portion 14.

Therefore, the check valve of the invention has the advantages that the inner diameter of the beam part 12 is smaller than that of the outlet part 14, the driving shaft 52 is driven to rotate reversely by the fluid flowing reversely from the outlet part 14 to the inlet part 13 through the blades 51, the supporting rod assembly 42 is driven by the driving shaft 52 to move relative to the guide cylinder 41 to the inlet part 13, the peripheral side surface of the sealing film 31 is abutted against the side wall of the beam part 12, the sealing is realized, the effect of stably and reliably preventing the reverse flow can be realized even in a pipeline with small fluid pressure, and the applicability of the check valve is improved. And the driving shaft 52 can move back and forth along the axial direction of the guide cylinder 41, the check valve does not need to be adjusted manually in the working process, the effect of one-way circulation can be achieved, and the working efficiency is high.

Referring to fig. 3, in some embodiments, the support sheet 3 is located at an end of the beam portion 12 near the inlet portion 13. The support sheet 3 is located at one end of the beam portion 12 close to the inlet portion 13, that is, the distance between the support sheet 3 and the inlet portion 13 is smaller than the distance between the support sheet 3 and the outlet portion 14. That is, the distance between the valve core assembly 2 and the inlet portion 13 is less than the distance between the valve core assembly 2 and the outlet portion 14.

With such an arrangement, when the fluid reversely flows from the outlet portion 14 to the beam portion 12, since the inner diameter of the beam portion 12 is smaller than that of the outlet portion 14, the flow speed is increased when the fluid reaches the beam portion 12, which is beneficial for the fluid to drive the blades 51 to reversely rotate. By positioning the supporting sheet 3 at one end of the beam portion 12 close to the inlet portion 13, a larger distance is beneficial to the stability of the flow velocity of the fluid, so that the rotation speed of the blade 51 is more uniform, and the stability and reliability of the non-return effect are improved.

In some embodiments, the internally threaded portion is provided with a stop collar at an end adjacent the outlet portion 14; an engaging ring which is engaged with the stopper ring is provided at an end of the external thread portion adjacent to the outlet portion 14, and when the engaging ring is engaged with the stopper ring, the driving shaft 52 is rotated relative to the guide cylinder 41.

Optionally, the limiting ring and the guide cylinder 41 are integrated, so that the structure is stable, and the processing is simple and convenient. The limiting ring is a circular ring, and the cross section of the limiting ring can be triangular, rectangular, trapezoidal and the like. The spacing ring can be one, two, three etc. when the spacing ring is a plurality of, a plurality of spacing rings set up along guide cylinder 41 axial evenly at interval, and processing is simple. The embodiment of the invention does not limit the cross section shape and the number of the limiting rings.

Optionally, the mating ring and the driving shaft 52 are an integral piece, and the machining is simple and convenient. The matching ring is a circular ring, and the cross section of the matching ring is the same as that of the limiting ring, so that the matching ring is conveniently matched with the limiting ring. The number of the matching rings can be the same as that of the limiting rings or different from that of the limiting rings, for example, when the number of the limiting rings is two, the number of the matching rings is three; as another example, when the stop collar is five, the mating collar is four, etc.

When the driving shaft 52 is rotated until the retainer ring is engaged with the engagement ring, the driving shaft 52 can only rotate relative to the guide cylinder 41 and cannot move in the axial direction of the guide cylinder 41. Through setting up the spacing ring and the cooperation ring of mutually supporting for drive shaft 52 can only remove in predetermineeing the within range along the guide cylinder 41 axial, is favorable to improving the stability of check valve, avoids bracing piece subassembly 42 displacement to be too big and damage sealing membrane 31.

Fig. 5 is a schematic structural diagram of the supporting rod assembly 42 according to an embodiment of the present invention, and referring to fig. 4 and 5, in some embodiments, the supporting rod assembly 42 includes a supporting rod 421 and a pressing rod 422, a first end of the supporting rod 421 is hinged to the moving plate 55, a second end of the supporting rod 421 is hinged to the pressing rod 422, and the pressing rod 422 is connected to the sealing film 31.

The cross-sectional shape of the support bar 421 can be circular, square, triangular, etc., for example, the cross-sectional shape of the support bar 421 is circular, which is easy and convenient to process. Optionally, a first end of the supporting rod 421 is provided with a first connecting hole, the moving plate 55 is provided with a first hinge seat, a first end of the first hinge seat is welded on the moving plate 55, a second end of the first hinge seat is provided with a second connecting hole, and the supporting rod 421 is hinged to the moving plate 55 by penetrating a first hinge shaft in the first connecting hole and the second connecting hole.

The cross-sectional shape of the support bar 421 may be circular, square, triangular, etc. Optionally, a second end of the supporting rod 421 is provided with a third connecting hole, the pressing rod 422 is provided with a second hinge seat, a first end of the second hinge seat is welded on the pressing rod 422, a second end of the second hinge seat is provided with a fourth connecting hole, and the supporting rod 421 is hinged to the pressing rod 422 by penetrating a second hinge shaft into the third connecting hole and the fourth connecting hole.

The plunger 422 is connected to the sealing film 31 in various ways, for example, by directly bonding the plunger 422 to the sealing film 31 with an adhesive; for another example, an installation seat is arranged on the sealing film 31, the installation seat and the sealing film 31 are made of the same material, the installation seat and the sealing film 31 can be an integral piece, the installation seat can also be fixed on the sealing film 31 through bonding or hot melting connection, an installation hole is formed in the installation seat, and the compression rod 422 penetrates through the installation hole, so that the connection is stable and reliable.

By providing the support rod 421 and the pressing rod 422, when the fluid reversely flows from the outlet portion 14 to the inlet portion 13, the driving shaft 52 can move the sealing film 31 toward the inlet portion 13 through the support rod 421; when fluid flows from the inlet 13 to the outlet 14, on one hand, the sealing film 31 is squeezed and contracted by the fluid so as to drive the support rod 421 to move towards the outlet 14 through the press rod 422, and on the other hand, the blades 51 rotate forwards under the action of the fluid so as to drive the driving shaft 52 to move towards the outlet 14.

As shown in fig. 4, in some embodiments, the side of the sealing membrane 31 facing away from the support sheet 3 is provided with an elastic connecting disc 32, the elastic connecting disc 32 being fixedly connected with the guide cylinder 41; the sealing film 31 is circular; the compression bar 422 extends along the radial direction of the sealing film 31, and the outer end of the compression bar 422 is connected with the sealing film 31; when the fluid flows from the inlet 13 to the outlet 14 in the forward direction, the fluid presses the sealing film 31 from the overflowing hole, the inner end of the press rod 422 presses the elastic connecting disc 32 to move towards the center of the sealing film 31, and the support rod 421 moves towards the outlet 14 along the guide opening 411.

The elastic connecting disc 32 is fixedly connected to the side of the sealing film 31, which is far away from the support sheet 3, and the area of the elastic connecting disc 32 is smaller than that of the sealing film 31. The elastic connecting disc 32 and the sealing film 31 may be formed as a single piece, or the elastic connecting disc 32 and the sealing film 31 may be separately formed and then the elastic connecting disc 32 and the sealing film 31 are fixedly connected by bonding or thermal fusion. The elastic connecting disc 32 is fixedly connected with the guide cylinder 41, and optionally, the elastic connecting disc 32 is a circular disc, so that the elastic connecting disc is conveniently connected with the guide cylinder 41. The area of the elastic connecting disc 32 can be larger than or equal to the cross-sectional area of the guide cylinder 41, and the side of the elastic connecting disc 32 facing away from the sealing film 31 is adhered to the first end face of the guide cylinder 41.

The sealing film 31 is circular, which is beneficial to the circumference of the sealing film 31 to be attached to the side wall of the beam portion 12. The plunger 422 is connected to the sealing membrane 31 along the radial direction of the sealing membrane 31, that is, the first end of the plunger 422 is close to the center position of the sealing membrane 31, and the second end of the plunger 422 is close to the edge position of the sealing membrane 31. The outer end of the plunger 422 is connected to the sealing membrane 31, i.e. the second end of the plunger 422 is connected to the sealing membrane 31, thereby preventing the second end of the plunger 422 from damaging the sealing membrane 31. The connection mode of the two ends of the compression bar 422 and the sealing film 31 can be various, for example, the second end of the compression bar 422 is processed into a ball shape, so that the sealing film 31 is prevented from being scratched by the second end of the compression bar 422, and then the second end of the compression bar 422 is connected with the sealing film 31; for another example, the second end of the plunger 422 may be formed in a hook shape, and a first connecting member with a corresponding hook groove may be provided on the sealing film 31 such that the hook-shaped portion of the second end of the plunger 422 is received in the hook groove of the first connecting member.

The inner end of the press rod 422, i.e. the first end of the press rod 422, is close to the center of the sealing film 31, the first end of the press rod 422 can press the elastic connecting disc 32 to move towards the center of the sealing film 31, i.e. the first end of the press rod 422 is connected with the circumferential side surface of the elastic connecting disc 32, the connection mode can be various, for example, the first end of the press rod 422 can be also processed into a hook shape, a second connecting piece with a corresponding hook groove is arranged on the elastic connecting disc 32, and the hook-shaped part of the first end of the press rod 422 is accommodated in the hook groove of the second connecting piece; for example, a connection pipe having one end connected to the circumferential side surface of the elastic connection plate 32 is provided on the seal film 31, and the first end of the press rod 422 is inserted into the connection pipe.

By providing the radially extending struts 422 on the sealing membrane 31, the fluid causes the drive shaft 52 to rotate in the opposite direction via the vanes 51 when the fluid flows in the opposite direction from the outlet portion 14 to the inlet portion 13. The driving shaft 52 drives the supporting rod 421 to move towards the inlet 13, so that the pressing rod 422 moves along the radial direction of the sealing film 31, the sealing film 31 is expanded, the circumferential side surface of the sealing film 31 is abutted against the side wall of the beam portion 12, and the purpose of stopping back is achieved; when the fluid flows from the inlet part 13 to the outlet part 14 in the forward direction, the first end of the press rod 422 presses the elastic connecting disc 32 to move towards the center of the sealing film 31, so that the sealing film 31 is gathered, the circumferential side surface of the sealing film 31 is separated from the side wall of the beam part 12, and the fluid can flow to the outlet part 14; at the same time, the fluid drives the driving shaft 52 to rotate forward through the blades 51, so that the driving shaft 52 moves toward the outlet portion 14, and the driving shaft 52 further stretches the supporting rod 421 toward the outlet portion 14, so that the sealing film 31 is kept in a folded state. The process does not need manual intervention, and the driving shaft 52 can axially move back and forth along the guide cylinder 41 by means of the flow impact blades 51, so that the check valve does not need manual adjustment in the using process, and the working efficiency is improved.

In some embodiments, at least one sleeving part 423 is disposed on the pressing rod 422, a connecting sleeve 33 is disposed on the sealing membrane 31, and the connecting sleeve 33 is sleeved outside the sleeving part 423. The socket 423 may have various shapes, for example, the socket 423 may have a rectangular block shape; for another example, referring to fig. 5, the socket is a round bar. One end of the connecting sleeve 33 is fixedly connected with the sealing film 31, and the other end of the connecting sleeve 33 is provided with a through hole with the same shape as the cross section of the sleeving part 423, so that the connecting sleeve 33 is tightly connected with the sleeving part 423. Optionally, the connecting sleeve 33 and the sealing film 31 are made of the same material, the connecting sleeve 33 and the sealing film 31 can be an integral piece, and the connecting sleeve 33 can also be fixed on the sealing film 31 through bonding or hot melting connection. The joint of the connecting sleeve 33 and the sleeving part 423 can be fastened secondarily by using sealant.

Optionally, the sleeving part 423 is provided with one, correspondingly, the connecting sleeve 33 is provided with one, the structure is simple, and the connection between the pressing rod 422 and the sealing film 31 is convenient.

Optionally, a plurality of sleeving parts 423 are arranged, and the plurality of sleeving parts 423 are arranged at intervals along the length direction of the pressing rod 422; correspondingly, a plurality of connecting sleeves 33 are also provided, and the connecting sleeves 33 are arranged at intervals along the length direction of the pressing rod 422. Optionally, referring to fig. 5, two, correspondingly, two connecting sleeves 33 are provided for the two sleeving parts 423, and by providing the two sleeving parts 423 and the two corresponding connecting sleeves 33, the structure is not complicated while the pressing rod 422 is tightly connected with the sealing film 31, and the processing is convenient.

Through set up the portion 423 that cup joints on depression bar 422, set up adapter sleeve 33 on sealing membrane 31, be favorable to improving the compactness of being connected between depression bar 422 and the sealing membrane 31.

Referring to fig. 3, in some embodiments, the beam portion 12 is provided with a connection portion 121, and an inner diameter of a first end of the connection portion 121 is greater than an inner diameter of a second end of the connection portion 121; the sealing film 31 is disposed at the first end of the connection part 121, and the outer diameter of the sealing film 31 is equal to the inner diameter of the first end of the connection part 121.

Referring to fig. 3, the inner diameter of the first end of the connecting portion 121 is greater than the inner diameter of the second end of the connecting portion 121, the first end of the connecting portion 121 is close to the supporting piece 3, the sealing film 31 is disposed in the first end of the connecting portion 121, the area of the sealing film 31 is equal to the area of the end surface of the first end of the connecting portion 121, and the inner diameter of the second end of the connecting portion 121 is equal to the inner diameter of the beam portion 12, so that the area of the sealing film 31 is greater than the area of the supporting piece 3, when the fluid flows in the reverse direction from the outlet portion 14, the.

In some embodiments, an elastic member 56 is further disposed in the first end of the guide cylinder 41, the first end of the elastic member 56 is connected to the sealing film 31, and the second end of the elastic member 56 is connected to the moving plate 55; in other embodiments, the side of the sealing membrane 31 facing away from the support sheet 3 is provided with an elastic connection disc 32, and a first end of the elastic member 56 is connected to the elastic connection disc 32.

The elastic member 56 may be a metal member or a non-metal member, for example, the elastic member 56 is a rubber member; for another example, the elastic member 56 is a metal spring or the like.

The first end of the elastic element 56 is fixedly connected with the elastic connecting disc 32, and when the elastic element 56 is a metal element, the elastic element 56 can be directly bonded on the elastic connecting disc 32; when the elastic member 56 is a non-metal member, the connection manner may be a thermal fusion connection or an adhesive. A second end of the elastic member 56 is connected to the moving plate 55, and when the elastic member 56 is a metal member, the elastic member 56 may be fixed to the moving plate 55 by a screw, or the elastic member 56 may be welded to the moving plate 55; when the elastic member 56 is a non-metal member, the elastic member 56 can be directly bonded to the moving plate 55.

By providing the elastic member 56 between the moving plate 55 and the first end of the guide cylinder 41, the support rod assembly 42 and the sealing film 31 can be prevented from being damaged by too high speed when the driving shaft 52 moves toward the inlet portion 13, and the support rod assembly 42 and the driving shaft 52 can be prevented from being damaged by too high pressure when the fluid flows into and presses the sealing film 31 from the inlet portion 13 in the forward direction, which is beneficial to improving the stability and the service life of the check valve.

In some embodiments, the check valve further includes a first fixing frame 6 fixedly connected to the beam portion 12, the first fixing frame 6 is provided with a first supporting channel, the first supporting channel is sleeved outside the guiding cylinder 41, the first fixing frame 6 is located between the blade 51 and the guiding opening 411, and the first fixing frame 6 is further provided with a first overflowing channel.

Referring to fig. 3, the first fixing frame 6 is provided on the side of the sealing film 31 near the outlet portion 14. Optionally, the first fixing frame 6 is a circular plate, the circular plate is provided with a central circular hole, and the aperture of the central circular hole is slightly larger than the outer diameter of the guide cylinder 41, so that the outer side wall of the guide cylinder 41 penetrates through the central circular hole in the first fixing frame 6, and the joint of the outer side wall of the guide cylinder 41 and the first fixing frame 6 can be tightly connected through welding, bonding and other modes. The circumferential side surface of the circular plate is fixedly connected with the side wall of the beam portion 12 in a welding mode, an adhesion mode and the like. When the first fixing frame 6 is a circular plate, a first opening is arranged on the circular plate, the first opening is a first flow passage, and the first opening can be a circular hole, a square hole and the like. The number of the first openings may be one, and the number of the first openings may also be multiple, for example, ten, eight, etc.; alternatively, the plurality of first openings are arranged at intervals in the circumferential direction of the circular plate.

Through setting up first mount 6 to fix the sleeve on first mount 6, not only be favorable to improving the stability of check valve in high-pressure fluid, and when making the check valve install on the pipeline of arbitrary direction, case subassembly 2 homoenergetic is stably fixed on valve body 1, thereby has improved the suitability of check valve.

In some embodiments, the check valve further includes a second fixing frame 7 fixedly connected to the beam portion 12, the second fixing frame 7 is provided with a second flow passage, and the second fixing frame 7 is fixedly connected to the support sheet 3 through a connecting rod 71.

Referring to fig. 3, the second holder 7 is disposed at a side of the support sheet 3 near the inlet portion 13. Optionally, the second fixing frame 7 is two rod members that intersect with each other, and two ends of the two rod members are respectively and fixedly connected to the side wall of the beam portion 12, and the connection manner may be welding, bonding, or the like. When the second fixing frame 7 is two mutually crossed rod pieces, the second overflowing channel is four fan-shaped holes. The second fixing frame 7 may also be a circular plate, and the circumferential side surface of the circular plate is fixedly connected with the side wall of the beam portion 12, and the connection mode may be welding, bonding, and the like. The circular plate is provided with a second opening, the second opening is a second overflowing channel, and the second opening can be a circular hole, a square hole and the like. The number of the second openings may be one, and the number of the second openings may also be multiple, for example, ten, eight, etc.; alternatively, the plurality of second openings are provided at intervals in the circumferential direction of the circular plate.

Alternatively, the connecting rod 71 is a solid rod, and the cross-sectional shape of the connecting rod 71 may be circular, square, triangular, or the like. The first end of the connecting rod 71 is connected to the second fixing frame 7 by welding, screwing, or the like. The second end of the connecting rod 71 is connected to the support plate 3, and the connecting mode may be welding, screw connection, or the like. Optionally, two ends of the connecting rod 71 may be further provided with a first connector and a second connector, respectively, the second fixing frame 7 is provided with a first connector mounting hole matched with the first connector, and the first connector may be accommodated in the first connector mounting hole; the support sheet 3 is provided with a second joint mounting hole matched with the second connector, and the second connector can be accommodated in the second joint mounting hole.

Through setting up second mount 7 to through connecting rod 71 with second mount 7 and backing sheet 3 fixed connection, make backing sheet 3 can fix in beam portion 12 more steadily, thereby make seal membrane 31 can obtain better support, be favorable to improving the stability of check valve in high-pressure fluid.

In the description above, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A check valve, comprising: the valve body is provided with a central channel, the central channel comprises a beam portion, an inlet portion and an outlet portion, the inlet portion and the outlet portion are respectively located at two ends of the beam portion, and the inner diameter of the beam portion is smaller than that of the outlet portion and that of the inlet portion;

the valve core assembly comprises a supporting sheet, a supporting frame and a driving part, wherein the supporting sheet is provided with an overflowing hole and is fixed at the beam flow part, and a sealing film is arranged on the side surface of one side, close to the outlet part, of the supporting sheet;

the supporting frame comprises a guide cylinder and a plurality of supporting rod assemblies, a first end of the guide cylinder is connected with the sealing film, and a second end of the guide cylinder is provided with an internal thread part; a plurality of guide openings extending in the axial direction are arranged between the internal thread part and the sealing film, and the plurality of guide openings are arranged at intervals along the circumferential direction of the guide cylinder;

the driving part comprises a blade and a driving shaft, the first end of the driving shaft is fixedly connected with the blade, and the second end of the driving shaft is provided with an external thread part in threaded connection with the internal thread part; the second end of the driving shaft is connected with a connecting column through a bearing, one end of the connecting column, which is far away from the bearing, is connected with a movable plate, and the movable plate is connected with the first end of the supporting rod assembly; the second end of the support rod assembly passes through the guide opening and is connected with the sealing film;

when the fluid flows from the inlet part to the outlet part, the fluid presses the sealing membrane from the overflowing hole to move the supporting rod assembly along the guide opening towards the outlet part, so that the peripheral side surface of the sealing membrane and the lateral wall of the beam flow part form a flow passage;

when the fluid flows from the outlet part to the inlet part, the fluid drives the driving shaft to rotate through the blades, so that the driving shaft drives the supporting rod assembly to move towards the inlet part relative to the guide cylinder, and the peripheral side surface of the sealing membrane is in butt joint with the side wall of the beam flow part for sealing.

2. The check valve of claim 1, wherein the support tab is located at an end of the flow restriction portion proximate the inlet portion.

3. The check valve of claim 1, wherein an end of the internally threaded portion adjacent to the outlet portion is provided with a stop ring;

and a matching ring matched with the limiting ring is arranged at one end of the external thread part close to the outlet part, and when the matching ring is matched with the limiting ring, the driving shaft rotates relative to the guide cylinder.

4. The check valve of claim 1, wherein the support rod assembly comprises a support rod and a pressure rod, a first end of the support rod is hinged to the moving plate, a second end of the support rod is hinged to the pressure rod, and the pressure rod is connected to the sealing membrane.

5. The check valve of claim 4, wherein an elastic connecting disc is arranged on one side of the sealing film, which faces away from the supporting sheet, and the elastic connecting disc is fixedly connected with the guide cylinder;

the sealing film is circular; the compression bar extends along the radial direction of the sealing film, and the outer end of the compression bar is connected with the sealing film;

the fluid by the entering part flow direction when the exit portion, the fluid is followed the discharge orifice extrusion the seal membrane, the inner extrusion of depression bar the elastic connection dish orientation the centre of a circle of seal membrane removes, the bracing piece is followed the direction opening orientation exit portion removes.

6. The check valve of claim 5, wherein the pressure rod is provided with at least one sleeve joint part, the sealing membrane is provided with a connecting sleeve, and the connecting sleeve is sleeved outside the sleeve joint part.

7. The check valve of any of claims 1-6, wherein the flow restraining portion is provided with a connecting portion having a first end with an inner diameter greater than an inner diameter of a second end of the connecting portion;

the seal membrane sets up the first end of connecting portion, just the external diameter of seal membrane with the internal diameter of the first end of connecting portion equals.

8. The check valve of any of claims 1-6, further comprising an elastic member disposed within the first end of the guide cylinder, wherein the first end of the elastic member is coupled to the sealing membrane and the second end of the elastic member is coupled to the moving plate.

9. The check valve of any one of claims 1-6, further comprising a first fixing frame fixedly connected to the beam portion, wherein the first fixing frame is provided with a first supporting channel, the first supporting channel is sleeved outside the guide cylinder, the first fixing frame is located between the blade and the guide opening, and the first fixing frame is further provided with a first flow passage.

10. The check valve of any one of claims 1-6, further comprising a second mount fixedly connected to the beam portion, the second mount being provided with a second flow passage, and the second mount being fixedly connected to the support sheet by a connecting rod.