CN112879594A

CN112879594A - Reversible four-way valve

Info

Publication number: CN112879594A
Application number: CN202110241249.1A
Authority: CN
Inventors: 张平峰
Original assignee: Ningbo Gongcheng Machinery Co ltd
Current assignee: Ningbo Gongcheng Machinery Co ltd
Priority date: 2021-03-04
Filing date: 2021-03-04
Publication date: 2021-06-01

Abstract

The invention provides a four-way valve capable of reversing, which comprises a valve body, wherein a valve cavity, a first pipeline, a second pipeline, a third pipeline and a fourth pipeline are formed in the valve body and communicated with the valve cavity, a butterfly plate is rotatably arranged in the valve cavity, when the butterfly plate rotates to a left limit position, the first pipeline is communicated with the second pipeline, and meanwhile, the third pipeline is communicated with the fourth pipeline; when the butterfly plate rotates to the right limit, the first pipeline is communicated with the fourth pipeline, the second pipeline is communicated with the third pipeline, and a handle which is connected with the butterfly plate and used for controlling the butterfly plate to rotate is arranged outside the valve body. The reversible four-way valve can adjust the direction of the fluid in the output pipeline and the output pipeline according to the requirement, can meet the requirements of working conditions such as backwashing and the like, and has the advantages of simple and labor-saving operation and wide application range.

Description

Reversible four-way valve

Technical Field

The invention relates to a valve, in particular to a four-way valve capable of reversing.

Background

A pump is a machine that delivers or pressurizes a fluid. It transfers the mechanical energy of the prime mover or other external energy to the liquid, causing the liquid energy to increase. The pump is mainly used for conveying liquid such as water, oil, acid-base liquid, emulsion, suspension emulsion and liquid metal, and can also be used for conveying liquid, gas mixture and liquid containing suspended solid. Pumps can be generally classified by their operating principle into three types, positive displacement pumps, dynamic pumps and other types of pumps. In addition to classification by theory of operation, classification and naming may be by other methods. For example, the driving method may be classified into an electric pump, a turbine pump, and the like; can be divided into a single-stage pump and a multi-stage pump according to the structure; can be divided into a boiler feed pump, a metering pump and the like according to the application; the liquid can be divided into a water pump, an oil pump, a slurry pump and the like according to the property of the transported liquid. According to the structure with or without shaft, the linear pump and the traditional pump can be divided. The water pump can only convey material flow taking fluid as a medium, and can not convey solids.

The traditional plunger pump is influenced by the structure, the utilization rate of the piston stroke is low, the water supply is discontinuous, and the water supply effect and the stability are not ideal; and the traditional plunger pump has single function, for example, the function can not be reversed, and the application range is narrow.

Therefore, the applicant develops an uninterrupted water supply system and is provided with a reversing valve to meet the use requirements of various working conditions.

Disclosure of Invention

Technical problem to be solved

The invention aims to provide a reversible four-way valve which is compact in structure and can convert a water inlet pipe and a water outlet pipe.

Technical scheme for solving problems

The invention provides a four-way valve capable of reversing, which comprises a valve body 5, wherein a valve cavity, a first pipeline 501, a second pipeline 502, a third pipeline 503 and a fourth pipeline 504 are formed in the valve body 5 and communicated with the valve cavity, a butterfly plate 56 is rotatably arranged in the valve cavity, when the butterfly plate 56 rotates to a left limit position, the first pipeline is communicated with the second pipeline, and meanwhile, the third pipeline is communicated with the fourth pipeline; when the butterfly plate 56 rotates to the right limit position, the first pipeline is communicated with the fourth pipeline, the second pipeline is communicated with the third pipeline, and a handle 54 which is connected with the butterfly plate and used for controlling the butterfly plate to rotate is arranged outside the valve body.

Furthermore, the rotation axis of the butterfly plate is perpendicular to the plane formed by the axes of the pipelines.

Further, the valve body 5 comprises a valve body 51, the valve cavity is formed in the valve body 51, a liquid outlet 531 and a liquid inlet 532 are formed in the rear end of the valve body 51, and the liquid outlet 531 is communicated with the upper end of the valve cavity through a flow passage to form a first pipeline; the liquid inlet 532 is communicated with the lower end of the valve cavity through a flow passage to form a third pipeline; openings penetrate through two sides of the valve cavity, and connecting pipes are arranged on the openings and form a second pipeline and a fourth pipeline respectively.

Furthermore, the end part of the connecting pipe is provided with a quick movable joint.

Further, the upper and lower both ends of valve body ranging back and form the installation department, the inlet with the liquid outlet is seted up on the installation department.

Furthermore, the side wall of the butterfly plate 56 is provided with two coaxially arranged cylindrical bodies 561, the axes of the two cylindrical bodies are perpendicular to and intersect with the axis of the laminated plate 56, the laminated plate is rotatably installed in the valve cavity through the two cylindrical bodies, and one of the cylindrical bodies extends out of the valve body and is connected with the handle.

Furthermore, the valve cavity is spherical, and the side wall of the valve cavity is provided with a sealing bulge which is contacted with the side wall of the butterfly plate when the butterfly plate rotates to the limit position so as to realize sealing.

Furthermore, a rubber layer is coated outside the butterfly plate.

Advantageous effects

The reversible four-way valve can adjust the direction of the fluid in the output pipeline and the output pipeline according to the requirement, can meet the requirements of working conditions such as backwashing and the like, and has the advantages of simple and labor-saving operation and wide application range.

Drawings

FIG. 1 is a schematic diagram of an uninterruptible feed water plunger pump system incorporating the present invention;

FIG. 2 is a schematic view of another embodiment of an uninterruptible water supply plunger pump system incorporating the present invention;

FIG. 3 is a schematic diagram of a reciprocating drive mechanism for an uninterruptible water supply plunger pump system incorporating the present invention;

FIG. 4 is a cross-sectional view of a reciprocating drive mechanism of an uninterruptible water feed plunger pump system employing the present invention;

FIG. 5 is a schematic diagram of a cam-piston assembly of an uninterruptible feed water plunger pump system incorporating the present invention;

FIG. 6 is a top view of a cam piston assembly of an uninterruptible feed water plunger pump system employing the present invention;

FIG. 7 is a schematic view of an assembled cam piston assembly of an uninterruptible feed water plunger pump system incorporating the present invention;

FIG. 8 is a schematic illustration of the installation of a crankshaft of a cam-piston assembly of an uninterruptible feed water plunger pump system incorporating the present invention;

FIG. 9 is a schematic diagram of a plunger pump assembly for an uninterruptible feed water plunger pump system incorporating the present invention;

FIG. 10 is a cross-sectional view of a plunger pump assembly incorporating the present invention for an uninterruptible feed water plunger pump system;

FIG. 11 is a schematic diagram of the internal structure of a plunger pump assembly for an uninterruptible water supply plunger pump system according to the present invention;

FIG. 12 is a schematic view of another angular internal structure of a plunger pump assembly for an uninterruptible water supply plunger pump system incorporating the present invention;

FIG. 13 is a schematic diagram of a sliding plug for an uninterruptible water supply plunger pump system incorporating the present invention;

FIG. 14 is a cross-sectional view of a spool of an uninterruptible feedwater plunger pump system employing the present invention;

FIG. 15 is a schematic structural view of a valve body of the four-way reversible valve of the present invention;

FIG. 16 is another schematic angular view of the valve body of the four-way switchable valve of the present invention;

FIG. 17 is a transverse cross-sectional view of the valve body of the four-way reversible valve of the present invention;

FIG. 18 is a longitudinal cross-sectional view of a valve body of a four-way switchable valve of the present invention.

Detailed Description

The following describes embodiments of the present invention in detail with reference to the accompanying drawings.

Referring to fig. 1 to 18, the present invention provides an uninterrupted water supply plunger pump system, which includes a plunger pump device 4, a reciprocating driving mechanism 1 and a valve body 5.

A sliding plug cavity, a first sub water inlet cavity 440, a second sub water inlet cavity 441, a main water inlet cavity 403 and a water outlet cavity 402 are arranged in the plunger pump device 4, one end of the sliding plug cavity is communicated with the first sub water inlet cavity 440, the other end of the sliding plug cavity is communicated with the second sub water inlet cavity 441, the main water inlet cavity 403 is simultaneously communicated with the first sub water inlet cavity 440 and the second sub water inlet cavity 441, the water outlet cavity 402 is simultaneously communicated with the first sub water inlet cavity 440 and the second sub water inlet cavity 441, one-way valves are respectively arranged between the first sub water inlet cavity 440 and the main water inlet cavity 403, between the second sub water inlet cavity 441 and the main water inlet cavity 403, between the water outlet cavity 402 and the first sub water inlet cavity 440, and between the water outlet cavity 402 and the second sub water inlet cavity 441, and can realize blocking or communicating one-way valves along with the water flow direction;

the structure of the plunger pump device will be described in detail below:

referring to fig. 9-12, the plunger pump device 4 includes a plunger pump housing 41 formed with a cavity inside, the plunger pump housing 41 is a rectangular parallelepiped structure, a cylinder is horizontally disposed in the cavity, a sliding plug cavity is formed in the cylinder, the sliding plug cavity is disposed on the left and right sides, two ends of the sliding plug cavity penetrate through the plunger pump housing 41, so as to facilitate assembly, daily maintenance and maintenance of the sliding plug, end covers are fixed to two open ends of the sliding plug cavity through screws, and a seal ring is disposed between the end covers and the plunger pump housing to seal the sliding plug cavity; a working cavity is formed between the outer wall of the front end of the cylinder and the inner wall of the plunger pump shell, two horizontal partition plates 45 are arranged in the working cavity, the horizontal partition plates 45 divide the working cavity into an upper cavity, a middle cavity and a lower cavity (from top to bottom), a vertical partition plate 44 is arranged in the middle cavity, and the vertical partition plate 44 divides the middle cavity into a first sub water inlet cavity 440 and a second sub water inlet cavity 441; two ends of the sliding plug cavity are respectively provided with a notch for communicating the first sub water inlet cavity 440 and the second sub water inlet cavity 441, namely, the left end of the sliding plug cavity is communicated with the first sub water inlet cavity 440, and the right end of the sliding plug cavity is communicated with the second sub water inlet cavity 441; the upper end and the lower end of the first sub water inlet cavity 440 and the second sub water inlet cavity 441 are respectively provided with a hole body communicated with the adjacent cavities, specifically, the hole bodies comprise a first hole body which is arranged at the upper end of the first sub water inlet cavity 440 and is communicated with the water outlet cavity, a second hole body which is arranged at the lower end of the first sub water inlet cavity 440 and is communicated with the main water inlet cavity 403, a third hole body which is arranged at the upper end of the second sub water inlet cavity 440 and is communicated with the water outlet cavity, and a fourth hole body which is arranged at the lower end of the second sub water inlet cavity 440 and is communicated with the main water inlet cavity, wherein the first hole body and the second hole body are coaxially arranged, and the third hole body and the fourth hole body are coaxially arranged; the upper cavity is used as a water outlet cavity, the side wall of the water outlet cavity is provided with a water outlet, the lower cavity is used as a main water inlet cavity, and the side wall of the main water inlet cavity is provided with a water inlet; the hole body is provided with one-way valves, and each one-way valve enables fluid in the main water inlet cavity to enter the first sub water inlet cavity, otherwise, the fluid in the first sub water inlet cavity can enter the water outlet cavity, and otherwise, the fluid cannot enter the water outlet cavity; the fluid in the main water inlet cavity can enter the second sub water inlet cavity, otherwise, the fluid in the second sub water inlet cavity can enter the water outlet cavity, and otherwise, the fluid in the main water inlet cavity cannot enter the water outlet cavity; the upper end of the hole body is provided with a valve ball limiting device, a valve ball 461 is arranged in the valve ball limiting device, the valve ball 461 can block or communicate the hole body along the water flow direction, the valve ball limiting device is at least three limiting parts 47 arranged on the extension of the hole body, a floating area for accommodating the valve to realize up-and-down motion is formed between the limiting parts, specifically, the limiting parts 47 are rod bodies vertically arranged at the edge of the hole body, each limiting part comprises three rod bodies arranged in the circumferential direction, the limiting parts are arranged above the hole bodies, the limiting parts 47 and the valve ball form a one-way valve, and the edge of the hole body is provided with a rubber ring for improving the sealing property when the valve ball contacts; in order to facilitate assembly, the front end of the working cavity is open, a cover body is fixed at the open end through bolts to realize sealing, and a water inlet and a water outlet are formed in the cover body; meanwhile, a screw is arranged on the side wall of the working cavity, and a plug 48 is arranged on the screw.

The plunger pump device 4 is provided with a pressure increasing tank 3, referring to fig. 1-2, 9 and 11, the pressure increasing tank is fixed on the top of the plunger pump shell, specifically, the top of the water outlet cavity is provided with a hole and communicated with the pressure increasing tank 3, the pressure increasing tank 3 is integrally a cylindrical tank body for realizing pressure increasing and flow stabilizing, the pressure increasing tank 3 is provided with a safety valve and a pressure gauge so as to visually know the pressure condition in the tank body, and when the pressure is too high, the safety valve automatically releases the pressure to ensure safety.

The reciprocating driving mechanism 1 is connected with a sliding plug 68 in a sliding plug cavity and is used for pushing the sliding plug to reciprocate in the sliding plug cavity so as to realize the operation of the pump body; referring to fig. 1 to 8, the double-driving mechanism includes a first housing 11, the first housing is a rectangular parallelepiped structure for easy installation, a cam piston assembly having an output end connected to the sliding plug is disposed in the first housing 11, and a driving device 2 connected to the cam piston assembly and used for providing power is disposed on a side wall of the first housing 11; specifically, the cam-piston assembly includes a driving gear 65, a driven gear 61, a crankshaft 62 and a connecting rod 64, the driving gear 65 is rotatably installed in the first housing 11, an axis of the driving gear 65 is horizontally disposed and perpendicular to a sliding direction of the sliding plug, an end of the driving gear extends out of the first housing 11 and is connected to the driving device 2, in this embodiment, the driving device 2 is a driving motor and is fixed to a top of the first housing, a first belt pulley 23 is disposed on an output shaft of the driving motor, a second belt pulley 24 is fixed to an end of the driving gear 65, the first belt pulley and the second belt pulley are connected by a belt 25, and a diameter of the second belt pulley is larger than that of the first belt pulley, so that a deceleration effect is achieved after output; in order to improve the safety and the aesthetic property, a shield 21 which can cover the first belt pulley 23, the second belt pulley 24 and the belt is also arranged; a bottom plate 22 is arranged at the top of the first shell, the bottom plate is rotatably hinged to the top of the first shell, the angle is adjustable, a driving motor is fixed on the bottom plate 22, and the tightness of the belt is adjusted through angle adjustment. The driven gear 61 is meshed with the driving gear 65, the number of teeth of the driving gear is less than that of the driven gear, so as to achieve a further speed reduction effect, in the embodiment, the transmission ratio of the driving gear to the driven gear is 1/11-1/8, the teeth of the driving gear are all helical teeth, the head of the crankshaft 62 is rotatably hinged to the end face of the driven gear 61 and is eccentrically arranged, specifically, a central hole is formed in the driven gear 61, a main shaft is connected in the central hole through a key, the driven gear is installed in the first shell through the main shaft, the second belt pulley is fixed at the end of the main shaft, a convex shaft 612 is arranged at the end face of the driven gear 61, the axis of the convex shaft is parallel to the axis of the central hole and is different, the convex shaft is an annular bulge arranged at the end face of the driven gear 61, the outer wall of the annular bulge forms a circular working face, the ratio of the distance between the axis of the convex, the ratio of the radius of the convex shaft to the radius of the driven gear is 1/4-1/3; the head of the crankshaft 62 is provided with a first annular connecting part 621 which can be sleeved on the protruding shaft 612 and realize rotation, the tail of the crankshaft 62 is hinged on the piston 63, and the connecting rod is fixed on the piston; in order to improve the stability of the operation and avoid vibration caused by eccentricity, the driven gear 61 is provided with a lightening hole 610 and/or a balancing weight 611, and the center of gravity is located on the axis of the driven gear.

The connecting rod 64 is horizontally matched on the first shell in a sliding manner, the head of the connecting rod 64 is hinged at the tail of the crankshaft 62, the tail of the connecting rod 64 extends out of the first shell and is used as an output end of reciprocating motion and is connected with a sliding plug 68 in a sliding plug cavity, concretely, a vertical baffle plate 12 is arranged in the first shell 11, the first shell is divided into a first cavity 100 and a second cavity by the vertical baffle plate 12, a driving gear 65, a driven gear 61 and the crankshaft are arranged in the first cavity, a sliding plug sleeve 13 is fixed on the vertical baffle plate 12 and is horizontally arranged, a piston 63 is matched in the sliding plug sleeve in a sliding manner, an installation cavity with one end opened is formed on the sliding plug sleeve 63, a pin shaft used for connecting with a second annular connecting part 622 at the tail of the crankshaft 62 is arranged in the installation cavity, a screw hole is formed at the end part of the sliding plug sleeve, the end part of the connecting rod 64 is connected in the screw hole in a, the sealing assembly is arranged between the connecting rod and the pump shell and comprises a threaded cover body 431 and a plurality of sealing rings 43, the sealing rings are sleeved between the pump shell and the outer wall of the connecting rod, and the threaded cover body is sleeved on the connecting rod and is in threaded connection with the pump shell and used for fixing the sealing rings; the driving gear, the driven gear, the piston, the crankshaft and the connecting rod form a cam piston assembly.

Referring to fig. 13-14, a threaded connector 641 is disposed at an end of the connecting rod, a mounting hole is disposed on the sliding plug 68, the threaded connector passes through the mounting hole and is connected to a nut to realize fixation, and a sealing ring 683 attached to an inner wall of the sliding plug cavity is disposed on a sidewall of the sliding plug; specifically, the sliding plug 68 includes a circular inner supporting plate 681 and an outer supporting plate 682, two outer supporting plates are attached to two sides of the inner supporting plate, the diameter of the outer supporting plate 682 is larger than that of the inner supporting plate 681, in the embodiment, the inner supporting plate is made of an elastic material, the outer supporting plate is made of metal, preferably, the inner supporting plate is made of plastic, the outer supporting plate is made of stainless steel, an annular mounting groove for mounting a sealing ring 683 is formed between the outer edge of the inner supporting plate and the inner wall (opposite surface) of the outer supporting plate, and two sealing lips 6831 with triangular cross sections are arranged on the side wall of the sealing ring 683 and face to two sides respectively to improve the sealing performance when the sliding plug slides left and right; in the embodiment, the ratio of the thickness of the sliding plug to the diameter of the sliding plug is 1/6-1/5, the strength is high, and the size is small, so that the effective volume of the sliding plug cavity is increased.

The valve body 5 is arranged at the inlet end and the outlet end of the pump, referring to fig. 1-3 and fig. 15-18, the valve body 5 is provided with a water inlet pipe communicated with a main water inlet on the main water inlet cavity 403 and a water outlet pipe communicated with a water outlet on the water outlet cavity 402, and the valve body in the embodiment is a four-way butterfly valve; a valve cavity, a first pipeline 501, a second pipeline 502, a third pipeline 503 and a fourth pipeline 504 which are communicated with the valve cavity are formed in the valve body 5, a butterfly plate 56 is rotatably installed in the valve cavity, the rotation axis of the butterfly plate is perpendicular to the plane formed by the axes of the pipelines, when the butterfly plate 56 rotates to the left limit, the first pipeline is communicated with the second pipeline, and meanwhile, the third pipeline is communicated with the fourth pipeline; when the butterfly plate 56 rotates to the right limit, the first pipeline is communicated with the fourth pipeline, the second pipeline is communicated with the third pipeline, a handle 54 which is connected with the butterfly plate and used for controlling the butterfly plate to rotate is arranged outside the valve body, and the butterfly plate is controlled to rotate through the handle, so that the reversing of the pump in the pipeline of the whole system is realized; specifically, the valve body 5 comprises a valve body 51, the valve cavity is arranged on the valve body 51, the valve cavity is spherical, a sealing protrusion which is contacted with the side wall of the butterfly plate when the butterfly plate rotates to a limit position so as to realize sealing is arranged on the side wall of the valve cavity, a liquid outlet 531 and a liquid inlet 532 are arranged at the rear end of the valve body 51, and the liquid outlet 531 is communicated with the upper end of the valve cavity through a flow channel and forms a first pipeline; the liquid inlet 532 is communicated with the lower end of the valve cavity through a flow passage to form a third pipeline; in the embodiment, the upper end and the lower end of the valve body extend backwards to form the mounting part, the mounting part is integrally of a cylindrical structure, and the liquid inlet and the liquid outlet are formed in the end face of the mounting part; openings penetrate through two sides of the valve cavity, connecting pipes are arranged on the openings and form a second pipeline and a fourth pipeline respectively, and a quick movable joint is arranged at the end part of the connecting pipe and is a threaded joint for convenient connection; the lateral wall of folded plate 56 is equipped with two coaxial setting's cylindricality 561, the axis of two cylindricality is perpendicular and intersect in the axis of folded plate 56, the folded plate passes through two cylindricality and installs in the valve chamber with rotating, one of them cylindricality extends to the valve body outside and is connected with the handle, be circular at the butterfly plate, certain thickness has, it has the rubber layer to coat outside the butterfly plate, be used for improving the leakproofness, in order to improve the leakproofness of the protruding position of cylindricality, in this embodiment, be provided with conical or round platform type sealing part at the bellied root of cylindricality, the one end that the diameter of sealing part is big sets up outwards, be used for improving the sealed of the bellied root of cylindricality.

The uninterrupted water supply plunger pump system adopts a modular assembly design, and has low manufacturing cost, convenient assembly and low assembly difficulty; the power mechanism has large and stable output force; the reciprocating mechanism has stable and reliable operation, good balance, no eccentric vibration during working and low working noise; the pump body has unique structural design and low manufacturing cost, can realize double-cavity alternate uninterrupted work, greatly improves the energy utilization rate, avoids idle stroke and has high working efficiency; the valve ball forms a one-way valve structure, so that the manufacturing cost is further reduced, and the assembly is convenient; the booster pump is arranged to increase the pressure and stability of fluid, improve the output stability and simultaneously avoid dry grinding during closing; the design of cross valve can adjust the fluid direction in output pipeline and the output line according to the demand, can realize operating mode demands such as back flush, and application scope is wide.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a four-way valve that can commutate which characterized in that: the butterfly valve comprises a valve body, wherein a valve cavity, a first pipeline, a second pipeline, a third pipeline and a fourth pipeline are formed in the valve body and communicated with the valve cavity, a butterfly plate is rotatably mounted in the valve cavity, when the butterfly plate rotates to a left limit position, the first pipeline is communicated with the second pipeline, and meanwhile, the third pipeline is communicated with the fourth pipeline; when the butterfly plate rotates to the right limit, the first pipeline is communicated with the fourth pipeline, the second pipeline is communicated with the third pipeline, and a handle which is connected with the butterfly plate and used for controlling the butterfly plate to rotate is arranged outside the valve body.

2. A four-way reversible valve according to claim 1, wherein: the rotation axis of the butterfly plate is perpendicular to a plane formed by the axes of the pipelines.

3. A four-way reversible valve according to claim 1, wherein: the valve body comprises a valve body, the valve cavity is arranged on the valve body, a liquid outlet and a liquid inlet are formed in the rear end of the valve body, and the liquid outlet is communicated with the upper end of the valve cavity through a flow passage to form a first pipeline; the liquid inlet is communicated with the lower end of the valve cavity through a flow passage to form a third pipeline; openings penetrate through two sides of the valve cavity, and connecting pipes are arranged on the openings and form a second pipeline and a fourth pipeline respectively.

4. A four-way reversible valve according to claim 1, wherein: the end part of the connecting pipe is provided with a quick movable joint.

5. A four-way reversible valve according to claim 1, wherein: the upper and lower both ends of valve body ranging back and form the installation department, the inlet with the liquid outlet is seted up on the installation department.

6. A four-way reversible valve according to claim 1, wherein: the side wall of the butterfly plate 56 is provided with two coaxially arranged cylindrical bodies, the axes of the two cylindrical bodies are perpendicular to and intersect with the axis of the laminated plate, the laminated plate is rotatably installed in the valve cavity through the two cylindrical bodies, and one of the cylindrical bodies extends out of the valve body and is connected with the handle.

7. A four-way reversible valve according to claim 1, wherein: the valve cavity is spherical, and the side wall of the valve cavity is provided with a sealing bulge which is contacted with the side wall of the butterfly plate when the butterfly plate rotates to the extreme limit position so as to realize sealing.

8. A four-way reversible valve according to claim 1, wherein: the butterfly plate is wrapped with a rubber layer.