CN217108247U - Electric check valve - Google Patents

Abstract

The utility model relates to an engineering parts technical field discloses an electric check valve, including disk seat, valve body and the switching mouth that links to each other in proper order. The valve seat is used for installing and fixing the valve body, the switching port is used for being connected with a smoke exhaust pipe of the range hood, the valve body is rotatably provided with the valve block, the flexible skirt edge is circumferentially arranged on the valve block, and when the valve block rotates to block a channel in the valve body, the flexible skirt edge can be sealed and attached to the inner wall of the valve body. Because the valve body inner wall is smooth, does not set up and keeps off the muscle, consequently reduced the resistance when range hood discharges fume, promoted the smoke exhaust effect, the smooth greasy dirt gathering that can reduce of inner wall of valve body simultaneously guarantees the accuracy that the valve block opened and shut and judges, prevents that the motor from lasting the rotation and damaging because of the erroneous judgement. After the range hood is closed, the valve block rotates relative to the valve body again until the flexible skirt edge on the valve block is attached to the inner wall of the valve body in a sealing mode, so that the valve block completely blocks an inner channel of the valve body, oil smoke in the smoke exhaust pipeline is prevented from flowing backwards into a kitchen, and the use experience of a user is improved.

Description

Electric check valve

Technical Field

The utility model relates to an engineering parts technical field especially relates to an electric check valve.

Background

The range hood is one of the electrical appliances necessary for families, wherein the electric check valve is a common accessory of the range hood, and the electric check valve is generally arranged at the inlet of a common smoke exhaust pipeline in a kitchen and is connected with a smoke exhaust pipe of the range hood.

In the prior art, as shown in fig. 1 and 2, a retaining rib 101 is provided on an inner wall of a valve body 100 of an electric check valve, and a sealing strip 201 is provided on a valve plate 200 of the electric check valve. When the electric check valve is closed, the valve plate 200 rotates to press the sealing strip 201 on the blocking rib 101, so as to close the internal channel of the valve body 100.

The drawback of the above design is that after the electric check valve is used for a period of time, the oil collected inside the valve body 100 gradually increases (especially, the oil deposited on the rib 101 is serious), and since the oil on the rib 101 is more, the closing angle of the valve plate 200 is changed when leaving the factory (i.e., the valve plate 200 cannot be rotated to the preset angle when leaving the factory). When the electric check valve is closed, the sealing strip 201 at the edge of the valve plate 200 may already press the blocking rib 101, but the valve plate 200 does not rotate to a preset angle, so that the control end of the electric check valve cannot trigger the closing travel switch, the motor is always in a driving power supply state, and the motor is easily damaged due to overheating. In addition, the setting that keeps off muscle 101 can increase the resistance when range hood discharges fume, especially keeps off behind muscle 101 department gathering greasy dirt, can further increase the resistance of discharging fume, leads to range hood's fume extraction effect to worsen.

Therefore, there is a need for an electric check valve to solve the above problems.

SUMMERY OF THE UTILITY MODEL

Based on above problem, an object of the utility model is to provide an electric check valve can accurately open and stop, prevents that the motor from damaging because of the erroneous judgement, can reduce range hood's the resistance of discharging fume simultaneously, promotes the smoke exhaust effect.

In order to achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides an electric check valve, includes disk seat, valve body and the switching mouth that links to each other in proper order, the disk seat is used for the installation fixed the valve body, the switching mouth be used for with the pipe connection of discharging fume of range hood, the valve body internal rotation is provided with the valve block, be provided with flexible shirt rim along circumference on the valve block, the valve block rotates to sheltering from during the passageway in the valve body, flexible shirt rim can seal the laminating the inner wall of valve body.

As the utility model discloses an electric check valve's preferred scheme, the valve block includes the valve block main part, be provided with the sealing washer along circumference on the border of valve block main part, flexible shirt rim set up in the periphery of sealing washer.

As the utility model discloses an electric check valve's preferred scheme, the sealing washer through vulcanization technology nestification in the valve block main part, or the sealing washer bond in the valve block main part is last.

As the utility model discloses an electric check valve's preferred scheme, the valve block rotates to sheltering from during the passageway in the valve body, the surface of flexible shirt rim with the inner wall laminating of valve body, just the valve block with be the acute angle between the inner wall of valve body.

As the utility model discloses an electric check valve's preferred scheme, electric check valve still includes the driving piece, the both sides limit that the valve block is relative is provided with pivot and grafting structure respectively, relative both sides are provided with rotation hole and perforation respectively on the valve body inner wall, the pivot stretches into rotate the hole and with rotate hole normal running fit, grafting structure configured into with the output shaft of driving piece.

As the utility model discloses an electric check valve's preferred scheme, electric check valve still includes the transmission shaft, the one end of transmission shaft is provided with the bayonet joint, and the other end is provided with the mounting groove, be connected with the round pin axle on the output shaft, the output shaft passes through round pin axle joint in the mounting groove, the transmission shaft passes the perforation is passed through the bayonet joint with grafting structure pegs graft.

As the utility model discloses an electric check valve's preferred scheme, electric check valve still includes the stroke control module, the stroke control module is including starting travel switch and closing travel switch, along the crisscross first contact and the second contact that is provided with of axial interval on the transmission shaft, first contact is followed the transmission shaft rotates to the contact during starting travel switch, the driving piece is closed, the second contact is followed the transmission shaft rotates to the contact during closing travel switch, the driving piece is closed.

As the utility model discloses an electric check valve's preferred scheme, first contact with contained angle between the second contact equals pivoted angle when the valve block is switched to the open mode by the closed condition.

As the utility model discloses an electric check valve's preferred scheme, electric check valve still includes the housing, the housing cover is located outside the driving piece, the bottom of housing is provided with the draw-in groove, the outer wall of valve body is fitted with a contraceptive ring and is equipped with annular arch, the draw-in groove can with annular protruding joint.

As the utility model discloses an electric check valve's preferred scheme, the disk seat with between the valve body the switching mouth with all connect through the spinner mode between the valve body.

The utility model has the advantages that:

the utility model provides an electric check valve, the inner channel of disk seat, valve body and switching mouth all communicates, when the installation, can be fixed the disk seat to the wall in kitchen on, make the inner channel of disk seat and the exhaust pipe intercommunication in the kitchen, will switch mouthful and range hood's exhaust pipe connection, make range hood's exhaust pipe through switching mouth, valve body and disk seat and exhaust pipe intercommunication. When the range hood is not started, the electric check valve is in a closed state, the valve plate shields the channel inside the valve body, and the flexible skirt edge on the valve plate is attached to the inner wall of the valve body in a sealing mode. When the range hood is started for use, the electric check valve is started, the valve plate rotates relative to the valve body to open the internal channel of the valve body, and oil smoke sucked by the range hood is introduced into the smoke exhaust pipeline through the smoke exhaust pipe, the adapter, the valve body and the valve seat and then is discharged to the outside. Because the valve body inner wall is smooth, does not set up and keeps off the muscle, consequently reduced the resistance when range hood discharges fume, promoted the smoke exhaust effect, the smooth greasy dirt gathering that can reduce of inner wall of valve body simultaneously guarantees the accuracy that the valve block opened and shut and judges, prevents that the motor from lasting the rotation and damaging because of the erroneous judgement. After the range hood is closed, the electric check valve is also closed, the valve block rotates relative to the valve body again until the flexible skirt edge on the valve block is in sealing fit with the inner wall of the valve body, so that the valve block completely blocks the inner channel of the valve body, the oil smoke in the smoke exhaust pipeline is prevented from flowing backwards into a kitchen, and the use experience of a user is improved.

Drawings

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

FIG. 1 is a cross-sectional view of a prior art electrically operated check valve;

FIG. 2 is a partial view of FIG. 1;

FIG. 3 is a schematic structural view of an electric check valve according to an embodiment of the present invention;

FIG. 4 is a schematic view of a valve plate of an electric check valve according to an embodiment of the present invention;

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

FIG. 6 is an enlarged view of a portion of FIG. 5 at A;

FIG. 7 is a schematic view of the connection between the electric check valve and the control box according to the embodiment of the present invention;

FIG. 8 is a schematic view of an embodiment of the present invention showing the open configuration of the check valve;

fig. 9 is a schematic structural diagram (hidden starting travel switch) of the electric check valve according to the embodiment of the present invention when closed;

fig. 10 is a schematic structural view of a transmission shaft of an electric check valve according to an embodiment of the present invention;

fig. 11 is a side view of a drive shaft of an electric check valve according to an embodiment of the present invention.

In fig. 1 and 2:

100-a valve body; 101-blocking ribs; 200-valve plate; 201-a sealing strip;

in fig. 3 to 11:

1-a valve seat; 2-a valve body; 3-a transfer port; 4, valve plates; 5-a driving member; 6-a transmission shaft; 7-a stroke control module;

8-control line; 9-a control box; 10-power plug; 20-a housing; 30-degree scale;

21-an annular projection;

41-a flexible skirt; 42-a sealing ring; 43-a rotating shaft; 44-a plug-in structure;

51-an output shaft; 52-a pin shaft;

61-a plug-in connector; 62-mounting grooves; 63-a first contact; 64-a second contact; 65-a clamping groove; 66-a pointer;

661-clasp;

71-starting a travel switch; 72-closing the travel switch; 73-connecting plate.

Detailed Description

In order to make the technical problems, technical solutions and technical effects achieved by the present invention more clear, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 3 to 11, the present embodiment provides an electric check valve, which can be applied to a range hood, and the electric check valve includes a valve seat 1, a valve body 2 and an adapter 3, which are connected in sequence.

Wherein, disk seat 1 is used for the installation to fix valve body 2, and switching mouth 3 is used for being connected with range hood's exhaust pipe, and the rotation is provided with valve block 4 in the valve body 2, is provided with flexible shirt rim 41 along circumference on the valve block 4, and flexible shirt rim 41 is configured as the inner wall that can seal laminating valve body 2. Namely, when the valve plate 4 rotates to block the channel in the valve body 2, the flexible skirt 41 is tightly attached to the inner wall of the valve body 2.

Referring to fig. 3 and 5, the valve seat 1, the valve body 2 and the internal channel of the adapter port 3 of the electric check valve are all communicated, when being installed, the valve seat 1 can be fixed on the wall of a kitchen, so that the internal channel of the valve seat 1 is communicated with a smoke exhaust pipeline in the kitchen, the adapter port 3 is connected with a smoke exhaust pipe of a range hood, and the smoke exhaust pipe of the range hood is communicated with the smoke exhaust pipeline through the adapter port 3, the valve body 2 and the valve seat 1. When the range hood is not started, the electric check valve is in a closed state, the valve plate 4 shields the channel inside the valve body 2, and the flexible skirt 41 on the valve plate 4 is in sealing fit with the inner wall of the valve body 2. When the range hood starts to use, the electric check valve starts, the valve plate 4 rotates relative to the valve body 2 to open the internal channel of the valve body 2, and oil smoke sucked by the range hood is introduced into the smoke exhaust pipeline through the smoke exhaust pipe, the switching port 3, the valve body 2 and the valve seat 1 and then is exhausted to the outside. Because the inner wall of the valve body 2 is smooth, the blocking rib is not arranged, so that the resistance of the range hood during smoke discharge is reduced, the smoke discharge effect is improved, meanwhile, the inner wall of the valve body 2 is smooth, oil stain accumulation can be reduced, the accuracy of opening and closing judgment of the valve block 4 is ensured, and the motor is prevented from being damaged due to continuous rotation caused by misjudgment. After the range hood is closed, the electric check valve is also closed, the valve plate 4 rotates relative to the valve body 2 again until the flexible skirt edge 41 on the valve plate 4 is tightly attached to the inner wall of the valve body 2, so that the valve plate 4 completely blocks the inner channel of the valve body 2, the oil smoke in the smoke exhaust pipeline is prevented from flowing backwards to enter a kitchen, and the use experience of a user is improved.

Optionally, referring to fig. 4 to 6, the valve plate 4 includes a valve plate main body, a sealing ring 42 is circumferentially disposed on an edge of the valve plate main body, the flexible skirt 41 is disposed on an outer periphery of the sealing ring 42, and the flexible skirt 41 can be more conveniently fixed on the valve plate main body due to the arrangement of the sealing ring 42, so that the valve plate 4 can seal an internal channel of the shielding valve body 2. In this embodiment, the sealing ring 42 and the flexible skirt 41 are made of rubber materials, which have good flexibility, wear resistance and corrosion resistance, and can perform a good sealing function. Further, the seal ring 42 and the flexible skirt 41 are integrally formed as one piece for easy processing.

Preferably, in this embodiment, the flexible skirt 41 is in the form of a single sheet, which is easy to manufacture. In other embodiments, a plurality of layers of flexible skirts 41 can be arranged on the sealing ring 42, which can also have a good sealing effect, and the specific structure of the flexible skirts 41 can be selected according to actual design requirements.

Optionally, the sealing ring 42 is nested on the valve plate main body through a vulcanization process, the machining process is simple, and the sealing ring 42 can be firmly connected with the valve plate main body. In other embodiments, the sealing ring 42 may be adhered to the valve sheet main body by adhesive, as long as the sealing ring 42 can be firmly fixed.

Alternatively, referring to fig. 5 and 6, when the valve sheet 4 rotates to block the channel in the valve body 2, the surface of the flexible skirt 41 is attached to the inner wall of the valve body 2 (i.e. the flexible skirt 41 is in surface contact with the inner wall of the valve body 2), and an acute angle is formed between the valve sheet 4 and the inner wall of the valve body 2. When the electric check valve is closed, the valve plate 4 rotates to enable the flexible skirt edge 41 with the size larger than the inner diameter of the valve body 2 to preferentially touch the inner wall of the valve body 2, the flexible skirt edge 41 is attached to the inner wall of the valve body 2 in a surface contact mode along with the continuous rotation of the valve plate 4 in the closing direction, the channel in the valve body 2 can be completely separated by the valve plate 4, the oil smoke in the smoke exhaust pipeline is prevented from flowing backwards to enter a kitchen, and the sealing performance is good. When the valve plate 4 rotates to the state shown in fig. 6, the valve plate rotates in place, and an included angle between the valve plate 4 and the inner wall of the valve body 2 at the moment is defined as θ, wherein the θ is an acute angle. When the electric check valve is opened again, the valve plate 4 rotates anticlockwise in fig. 6, and the design that the angle theta is an acute angle is beneficial to the rotation of the valve plate 4 to open a channel in the valve body 2, so that the rotation resistance is small. Meanwhile, the angle theta is an acute angle, so that the sealing range of the flexible skirt edge 41 can be enlarged, the rotation angle of the valve plate 4 is prevented from reaching a preset value, and the closing failure of the electric check valve is avoided.

Alternatively, referring to fig. 3 and 4, the electric check valve further includes a driving member 5, two opposite sides of the valve plate 4 are respectively provided with a rotating shaft 43 and an insertion structure 44, two opposite sides of the inner wall of the valve body 2 are respectively provided with a rotating hole and a through hole, the rotating shaft 43 extends into the rotating hole and is rotatably matched with the rotating hole, and the insertion structure 44 is configured to be connected with an output shaft 51 of the driving member 5. When the driving member 5 is started, the output shaft 51 rotates to drive the valve plate 4 to rotate relative to the valve body 2, so that the valve plate 4 shields or opens a channel in the valve body 2, and the opening and closing of the electric check valve are realized. Preferably, the driving member 5 is a motor, and a housing of the motor is fixed to an outer wall of the valve body 2 through a fastener such as a screw, so that the installation is firm.

Alternatively, referring to fig. 7, the electric check valve further includes a transmission shaft 6, one end of the transmission shaft 6 is provided with a plug 61 (as shown in fig. 10), and the other end is provided with a mounting groove 62 (as shown in fig. 11). The output shaft 51 is connected with a pin shaft 52, the output shaft 51 is clamped in the mounting groove 62 through the pin shaft 52 (as shown in fig. 8 and 9), specifically, the output shaft 51 is provided with a pin hole along the radial direction, the pin shaft 52 penetrates through the pin hole, the shaft end of the output shaft 51 extends into the mounting groove 62, and the pin shaft 52 is clamped in the mounting groove 62 to connect the output shaft 51 and the transmission shaft 6 together.

Referring to fig. 3 and 4, the transmission shaft 6 passes through the through hole and is inserted into the insertion structure 44 through the insertion head 61. In this embodiment, the inserting structure 44 on the valve plate 4 is a plurality of first rectangular teeth (as shown in fig. 4) arranged at intervals, and the inserting head 61 on the transmission shaft 6 includes two clamping plates arranged at intervals up and down and a plurality of second rectangular teeth (as shown in fig. 10) arranged between the two clamping plates. When the plug-in connector 61 is plugged in the plug-in structure 44, the two clamping plates are respectively positioned at the upper side and the lower side of the valve plate 4, and meanwhile, the plurality of second rectangular teeth are in embedded connection with the plurality of first rectangular teeth to realize the connection of the transmission shaft 6 and the valve plate 4.

Optionally, referring to fig. 7, the electric check valve further includes a stroke control module 7, a control line 8 and a control box 9, one end of the control line 8 is connected to the stroke control module 7, the other end of the control line is connected to the control box 9, the driving member 5 is electrically connected to the control box 9, the control box 9 is configured to control the rotation direction of the valve plate 4 through the driving member 5 according to the opening and closing information of the range hood, and the stroke control module 7 is configured to control the driving member 5 to close through the control box 9 according to the rotation angle of the valve plate 4. When the range hood starts, the control box 9 obtains the information that the range hood starts promptly to control the driving piece 5 to start, so that the valve block 4 rotates to the direction of opening, when the valve block 4 rotates to first predetermined angle, the stroke control module 7 sends corresponding instruction to the control box 9 promptly, so that the control box 9 controls the driving piece 5 to shut down, the valve block 4 rotates to target in place, and the electric check valve is opened, guarantees that the inhaled oil smoke of range hood can discharge to outdoor smoothly. Similarly, when range hood closes, control box 9 obtains the information that range hood shut down promptly to control driving piece 5 starts, so that valve block 4 rotates to the direction of closing, when valve block 4 rotated to the second and predetermine the angle, stroke control module 7 sends corresponding instruction to control box 9 promptly, so that control box 9 control driving piece 5 shuts down, and valve block 4 rotates to target in place, and electric check valve closes, prevents that the interior oil smoke of exhaust pipe from flowing backward and getting into the kitchen.

Specifically, referring to fig. 8 and 9, the stroke control module 7 includes an on stroke switch 71 and an off stroke switch 72. Referring to fig. 10, the driving shaft 6 is provided with first contacts 63 and second contacts 64 alternately at intervals in the axial direction. When the first contact 63 rotates along with the transmission shaft 6 to contact the starting travel switch 71, the driving piece 5 is closed, and when the second contact 64 rotates along with the transmission shaft 6 to contact the closing travel switch 72, the driving piece 5 is closed. In this embodiment, the stroke control module 7 further includes a connecting plate 73, the start stroke switch 71 and the close stroke switch 72 are disposed on the connecting plate 73 at intervals, in fig. 8 and 9, the start stroke switch 71 and the close stroke switch 72 are disposed back and forth along a direction perpendicular to the outer wall of the valve body 2, that is, they are stacked at intervals, the front side is the start stroke switch 71 which is at the same height as the first contact 63, and the rear side is the close stroke switch 72 which is at the same height as the second contact 64. One end of the control wire 8 passes through the connecting plate 73 and is connected with the starting travel switch 71 and the closing travel switch 72 respectively to obtain triggering information of the starting travel switch 71 and the closing travel switch 72, so that the driving piece 5 is controlled to be closed through the control box 9.

Further, a control main board is arranged in the control box 9, a current detection module is arranged on the control main board, when a plug of the range hood is plugged into a jack of the control box 9 and starts the range hood, the current detection module obtains information about starting of the range hood, the control main board controls the driving piece 5 to start, so that the transmission shaft 6 drives the valve block 4 to rotate in the opening direction until the first contact 63 on the transmission shaft 6 contacts the starting travel switch 71 (as shown in fig. 8), which indicates that the valve block 4 rotates to the position, the control main board obtains information about triggering of the starting travel switch 71, so that the driving piece 5 is controlled to close, and the valve block 4 stops rotating. Similarly, when the range hood stops operating, the current detection module obtains information that the range hood is stopped, and the control main board controls the driving element 5 to start, so that the transmission shaft 6 drives the valve plate 4 to rotate in the closing direction until the second contact 64 on the transmission shaft 6 contacts the closing travel switch 72 (as shown in fig. 9), which indicates that the valve plate 4 rotates to the position, and the control main board obtains information that the closing travel switch 72 triggers, so as to control the driving element 5 to close and stop the rotation of the valve plate 4.

Alternatively, referring to fig. 8 and 9, the included angle between the first contact 63 and the second contact 64 is equal to the angle that the valve plate 4 rotates when switching from the closed state to the open state. Namely, when the transmission shaft 6 is rotated from the second contact 64 to the closing travel switch 72 to the first contact 63 to the starting travel switch 71, the valve plate 4 is just rotated from the state of shielding the passage in the valve body 2 to the state of opening the passage in the valve body 2. Similarly, when the transmission shaft 6 rotates from the first contact 63 to the starting travel switch 71 until the second contact 64 contacts the closing travel switch 72, the valve sheet 4 is just switched from the open state to the closed state.

Optionally, referring to fig. 7, the electric check valve further includes a power plug 10, one end of the power plug 10 is connected to the control box 9, the other end is configured to be plugged into a power source, and the range hood and the driving member 5 are both connected to the power source through the power plug 10. Wherein, the power can be the socket in the kitchen, and power plug 10 preferred tripod plug guarantees range hood safety in utilization.

Among the prior art, back in the electric check valve installs the exhaust pipe, the angle that opens and shuts of valve block 4 just can't learn, can not be directly perceivedly when debugging range hood or troubleshooting see the state that opens and shuts of valve block 4, need take apart the connection between valve body 2 and the exhaust pipe and just can inspect the trouble, complex operation influences the debugging progress.

In this embodiment, referring to fig. 8 and 9, the electric check valve further includes an angle scale 30, scale marks are disposed on the angle scale 30, a pointer 66 is disposed on the transmission shaft 6, and when the transmission shaft 6 rotates, the pointer 66 can point to different scale marks to indicate different opening/closing states of the valve plate 4. Specifically, when the range hood starts to use, the electric check valve starts, and the driving piece 5 drives the valve plate 4 to rotate along the first direction relative to the valve body 2 so as to open the internal channel of the valve body. Meanwhile, the pointer 66 rotates along with the output shaft 51 of the driving member 5 and points to a certain scale mark on the angle scale 30, and when the scale mark pointed by the pointer 66 is a first preset angle, it indicates that the valve plate 4 rotates in place, and the channel in the valve body 2 is opened. When the range hood is closed, the electric check valve is also closed, the driving part 5 drives the valve plate 4 to rotate along the second direction again (the second direction is opposite to the first direction), and meanwhile, the pointer 66 rotates along with the output shaft 51 of the driving part 5 until the scale mark pointed by the pointer 66 is a second preset angle, which indicates that the valve plate 4 is closed in place, and the internal channel of the valve body 2 is closed. Through setting up angle scale 30 and pointer 66, can acquire the angle state that opens and shuts of valve block 4 directly perceivedly, need not to unpack apart the connection between electric check valve and the exhaust pipe and can judge whether electric check valve breaks down, and it is convenient to overhaul the debugging, does benefit to troubleshooting.

Alternatively, referring to fig. 8 and 9, the angle scale 30 is disposed coaxially with the transmission shaft 6 to ensure that the indicator 66 can accurately indicate the rotation angle of the transmission shaft 6 (i.e. the rotation angle of the valve plate 4) when rotating with the transmission shaft 6. Different scale marks on the angle scale 30 pointed by the indicator 66 when the indicator rotates along with the transmission shaft 6 correspond to the opening and closing angles of the valve plate 4 one by one, so that the opening and closing angles of the valve plate 4 can be visually indicated. In this embodiment, the half of the scale line of the angle scale 30 and the pointer 66 are both located on the same side of the transmission shaft 6, and the pointer 66, the first contact 63 and the second contact 64 are distributed at intervals in the circumferential direction of the transmission shaft 6, so as to avoid interference between the pointer 66 and the start travel switch 71 and the close travel switch 72.

Specifically, the angle scale 30 is marked with an angle corresponding to an "ON" (ON) "and an" OFF "(OFF)" indication word and a scale mark, the angle corresponding to the scale mark below the angle scale 30 is the smallest, the angle corresponding to the scale mark in the clockwise direction is gradually increased, and the angle corresponding to the scale mark corresponds to the angle of the valve plate 4 in the valve body 2 one by one. As shown in fig. 8, when the first contact 63 contacts the start stroke switch 71, the pointer 66 is located ON one side of the "ON" direction ON the angle scale 30, and the scale line pointed by the pointer 66 is 90 degrees (the first preset angle), which indicates that the angle at which the valve sheet 4 is located is 90 degrees (the included angle between the valve sheet 4 and the cross section of the valve body 2), the valve sheet 4 extends along the axial direction of the valve body 2, and the internal passage of the valve body 2 is opened. As shown in fig. 9, when the second contact 64 contacts the closing travel switch 72, the pointer 66 is located on one side of the angle scale 30 in the closing (OFF) direction, the scale line pointed by the pointer 66 is 3 degrees (a second preset angle), which indicates that the angle of the valve plate 4 is also 3 degrees, the valve plate 4 blocks the channel in the valve body 2, the flexible skirt 41 abuts against the inner wall of the valve body 2, and the electric check valve is closed.

In this embodiment, when the valve plate 4 rotates to block the passage in the valve body 2, the angle on the angle scale 30 pointed by the pointer 66 is 3 degrees, that is, the angle at which the valve plate 4 is located is 3 degrees (the included angle between the valve plate 4 and the cross section of the valve body 2), and at this time, the included angle between the valve plate 4 and the inner wall of the valve body 2 is 87 degrees, that is, the θ angle is 87 degrees.

Optionally, referring to fig. 8 to 11, one of the pointer 66 and the transmission shaft 6 is provided with a snap ring 661, and the other is provided with a clamping groove 65, and the snap ring 661 is clamped with the clamping groove 65 to realize detachable connection of the pointer 66 and the transmission shaft 6, so that the assembly is convenient.

In this embodiment, preferably, a snap ring 661 is disposed at one end of the pointer 66, a clamping groove 65 (as shown in fig. 11) is disposed on the transmission shaft 6, and the snap ring 661 is clamped in the clamping groove 65, so that the pointer 66 can rotate along with the transmission shaft 6. Specifically, snap ring 661 is provided with a plurality of clamping protrusions, clamping groove 65 is provided with a plurality of on transmission shaft 6, and a plurality of clamping protrusions are clamped into a plurality of clamping grooves 65 in a one-to-one correspondence manner, so that pointer 66 is firmly fixed on transmission shaft 6. Illustratively, three clamping grooves 65 are formed on the transmission shaft 6, and correspondingly, three clamping protrusions are formed on the clamping ring 661 to ensure that the pointer 66 is firmly connected with the transmission shaft 6.

In other embodiments, a snap ring 661 can be disposed on the transmission shaft 6, a clamping protrusion is disposed on the snap ring 661, a clamping groove 65 is disposed at an end of the pointer 66, and the pointer 66 is clamped on the clamping protrusion of the snap ring 661 through the clamping groove 65, so that the pointer 66 and the transmission shaft 6 can be connected in the same manner.

Optionally, referring to fig. 3, the electric check valve further includes a cover 20, and the cover 20 is connected to an outer wall of the valve body 2 and covers the driving member 5 to protect the driving member 5. Further, the stroke control module 7, the angle dial 30 and the pointer 66 are all located in the housing 20, and the control wire 8 passes through the housing 20 and is electrically connected to the stroke control module 7. One side edge of the angle scale 30 with the scale marks extends out of the housing 20, so that the scale marks pointed by the pointer 66 can be conveniently and visually observed to know the opening and closing angle state of the valve plate 4. In this embodiment, the periphery wall of valve body 2 is fitted with a contraceptive ring and is equipped with an annular arch 21, and the bottom of housing 20 is provided with the draw-in groove, and housing 20 passes through the draw-in groove joint on annular arch 21 to guarantee the installation stability of housing 20 on valve body 2. Housing 20 is through the equipment mode of draw-in groove and the protruding 21 joints of annular, easy dismounting, and the later stage of being convenient for overhauls the electric check valve and maintains.

Optionally, referring to fig. 1, the valve seat 1 and the valve body 2, and the adapter 3 and the valve body 2 are connected in a screwing manner, so that the assembly is convenient. In this embodiment, referring to fig. 5, protrusions are disposed on inner walls of two ends of the valve body 2, and grooves are disposed on the connection ends of the valve seat 1 and the adapter 3, so that when the valve body is assembled, the connection end of the valve seat 1 extends into the valve body 2 and is screwed, when the protrusion is clamped into the groove, the connection end and the adapter 3 are connected stably, and similarly, the connection end and the adapter 3 extend into the valve body 2 and are screwed, so that the connection end and the adapter can be connected together, and the operation is simple.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious modifications, rearrangements and substitutions without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims (10)

1. The utility model provides an electric check valve, its characterized in that, includes disk seat (1), valve body (2) and switching mouth (3) that link to each other in proper order, disk seat (1) is used for the installation fixed valve body (2), switching mouth (3) are used for the union coupling of discharging fume with range hood, valve body (2) internal rotation is provided with valve block (4), be provided with flexible shirt rim (41) along circumference on valve block (4), valve block (4) rotate to sheltering from during the passageway in valve body (2), laminating can be sealed to flexible shirt rim (41) the inner wall of valve body (2).

2. The electric check valve according to claim 1, characterized in that the valve plate (4) comprises a valve plate main body, a sealing ring (42) is arranged on the edge of the valve plate main body along the circumferential direction, and the flexible skirt (41) is arranged on the periphery of the sealing ring (42).

3. The check valve of claim 2, wherein the seal ring (42) is nested on the valve plate body by a vulcanization process, or the seal ring (42) is bonded to the valve plate body.

4. The electric check valve according to claim 1, characterized in that when the valve plate (4) rotates to block the passage in the valve body (2), the surface of the flexible skirt (41) is attached to the inner wall of the valve body (2), and an acute angle is formed between the valve plate (4) and the inner wall of the valve body (2).

5. The check valve of claim 1, further comprising a driving member (5), wherein the opposite two sides of the valve plate (4) are respectively provided with a rotating shaft (43) and a plug-in structure (44), the opposite two sides of the inner wall of the valve body (2) are respectively provided with a rotating hole and a through hole, the rotating shaft (43) extends into the rotating hole and is rotatably matched with the rotating hole, and the plug-in structure (44) is configured to be connected with an output shaft (51) of the driving member (5).

6. The electric check valve according to claim 5, further comprising a transmission shaft (6), wherein one end of the transmission shaft (6) is provided with a plug (61), the other end of the transmission shaft is provided with a mounting groove (62), the output shaft (51) is connected with a pin shaft (52), the output shaft (51) is clamped in the mounting groove (62) through the pin shaft (52), and the transmission shaft (6) passes through the through hole and is plugged with the plugging structure (44) through the plug (61).

7. The electric check valve according to claim 6, further comprising a stroke control module (7), wherein the stroke control module (7) comprises an actuating stroke switch (71) and a closing stroke switch (72), the transmission shaft (6) is provided with a first contact (63) and a second contact (64) at intervals along the axial direction, the first contact (63) rotates along with the transmission shaft (6) to contact the actuating stroke switch (71), the driving member (5) is closed, and the second contact (64) rotates along with the transmission shaft (6) to contact the closing stroke switch (72), the driving member (5) is closed.

8. The electric check valve according to claim 7, characterized in that the angle between the first contact (63) and the second contact (64) is equal to the angle of rotation of the valve plate (4) when switching from the closed state to the open state.

9. The electric check valve according to claim 5, characterized in that, the electric check valve further comprises a cover shell (20), the cover shell (20) is covered outside the driving piece (5), a clamping groove is arranged at the bottom of the cover shell (20), an annular protrusion (21) is annularly arranged on the outer wall of the valve body (2), and the clamping groove can be clamped with the annular protrusion (21).

10. The electric check valve according to any of claims 1-9, characterized in that the connection between the valve seat (1) and the valve body (2) and the connection between the adapter (3) and the valve body (2) are by means of a turnbuckle.

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