阅读说明：本技术 一种防火止回阀的阀瓣开合装置和阀瓣开合方法 (Valve clack opening and closing device and method for fireproof check valve ) 是由 聂法玉 谭源生 于 2021-10-22 设计创作，主要内容包括：本发明提供了一种防火止回阀的阀瓣开合装置和阀瓣开合方法,阀瓣开合装置包括阀瓣、阀轴、第一弹性件和第二弹性件,阀瓣转动设置于阀轴上,第一弹性件和第二弹性件依次设置于阀瓣的转动路径上,在阀瓣的持续开启过程中依次作用于第一弹性件和第二弹性件,使第一弹性件和第二弹性件受压产生形变,从而在阀瓣的持续关闭过程中,利用第二弹性件和第一弹性件所产生的回弹作用力,使阀瓣关闭。本发明采用多个弹性件在阀瓣开启和关闭过程中进行协同配合,实现类似“接力”效果,具有开启过程阻力小、开启角度大和关闭顺畅的优点。(The invention provides a valve clack opening and closing device and a valve clack opening and closing method of a fireproof check valve. The invention adopts a plurality of elastic pieces to cooperate in the opening and closing processes of the valve clack, realizes the effect similar to relay, and has the advantages of small resistance in the opening process, large opening angle and smooth closing.)

1. The utility model provides a fire prevention check valve's valve clack device that opens and shuts, its characterized in that includes valve clack, valve shaft, first elastic component and second elastic component, the valve clack rotates and sets up in on the valve shaft, first elastic component with the second elastic component set gradually on the rotation route of valve clack in the continuous opening process of valve clack acts on in proper order first elastic component with the second elastic component makes first elastic component with the second elastic component pressurized produces the deformation, thereby in the continuous closing process of valve clack, utilize the second elastic component with the resilience effort that first elastic component produced, make the valve clack close.

2. The device as claimed in claim 1, wherein the first resilient member is a torsion spring, which is disposed on the valve shaft and is always compressed.

3. The device as claimed in claim 2, wherein the second resilient member is a torsion spring, and is disposed on the valve shaft, an original angle between two torsion legs of the second resilient member is smaller than an original angle between two torsion legs of the first resilient member, and the valve flap opened to a predetermined angle abuts against the second resilient member and compresses the second resilient member.

4. The apparatus of claim 2, wherein the second resilient member is a straight spring, the second resilient member is inclined upward toward the valve flap, and wherein the valve flap opened to a set angle abuts against the second resilient member and compresses the second resilient member.

5. The device for opening and closing the valve flap of a fire check valve as claimed in claim 3 or 4, wherein the setting angle of the valve flap against the second elastic member is adjustable.

6. The apparatus of claim 3, further comprising a third resilient member, wherein the third resilient member is a torsion spring, and the third resilient member is sleeved on the valve shaft, and wherein an original angle between two torsion legs of the third resilient member is smaller than an original angle between two torsion legs of the second resilient member.

7. The device of claim 2, further comprising a support shaft parallel to or coincident with the valve shaft, wherein the second elastic member is a torsion spring, and the second elastic member is sleeved on the support shaft.

8. The flap opening and closing apparatus of a fire check valve as claimed in claim 1, wherein the fire check valve has a valve seat inclined toward a front side of the flap, the flap closed on the valve seat being inclined, wherein the flap does not contact the second elastic member until the flap continues to be opened to an upright state.

9. The method for opening and closing the valve clack of the fireproof check valve is characterized in that two or more elastic pieces are sequentially arranged on the rotation path of the valve clack, the valve clack rotates forwards to open and sequentially compresses the two elastic pieces when exhausting is finished, and the valve clack is closed by utilizing the resilience acting force generated by the two elastic pieces when exhausting is finished.

10. The method of claim 9, wherein one of the elastic members is always in a compressed state during the opening and closing of the flap, and the other elastic member is always in a compressed state after the flap is opened beyond a predetermined angle.

Technical Field

The invention belongs to the technical field of fireproof check valves, and particularly relates to a valve clack opening and closing device and a valve clack opening and closing method of a fireproof check valve.

Background

The fire-proof check valve is one of the important components of the residential exhaust duct system, and mainly has the functions of guiding smoke in a resident room to flow upwards into the residential exhaust duct and preventing the smoke from flowing back, and meanwhile, the fire-proof check valve is provided with a fire-proof actuating mechanism to ensure fire-proof safety.

For example, chinese patent application 201710147354.2 discloses a fire check valve, which solves the problem that the fire check valve loses the smoke-isolating effect in a high-temperature environment. A fireproof check valve comprises a valve body, a valve block, a connecting rod, a shifting piece, a temperature sensing element and an elastic element, wherein an exhaust port is formed in the valve body, the valve block is covered on the exhaust port and is connected with the valve body through the connecting rod, the shifting piece is rotatably connected with the valve body, the temperature sensing element is fixed on the valve body, one end of the elastic element is fixedly connected with the valve body, the other end of the elastic element is connected with the shifting piece and drives the shifting piece to abut against the temperature sensing element, a clamping part is formed in the shifting piece, and a clamping matching part is formed in the connecting rod; when the elastic element drives the shifting sheet to rotate relative to the valve body and extrudes the connecting rod, so that the connecting rod closes the exhaust port through the valve sheet, the clamping part is matched with the clamping matching part to prevent the connecting rod from rotating relative to the valve body.

For another example, chinese patent application 201821290666.5 discloses a locking structure and water conservancy diversion formula flue fire prevention check valve for fire prevention check valve, belong to valve technical field, including setting up base and the elastic element in the valve body, be provided with the movable connecting rod on the base, one side of base articulates there is the retaining member, elastic element is fixed in on the articulated shaft of retaining member and drives the retaining member and offset with the movable connecting rod, the one end of retaining member articulates there is the connecting piece that can stretch out and link firmly from the valve body, the articulated shaft that is used for articulated connecting piece adopts low melting point alloy fuse.

At present, the valve flap in the fireproof check valve under the latest national standard needs to satisfy the following opening conditions: when the toilet is used in a kitchen, the toilet needs to be opened at 60 degrees or more under the action of 80 Pa pressure, and when the toilet is used, the toilet needs to be opened at 60 degrees or more under the action of 25 Pa pressure; however, the fireproof check valve in the prior art has the defects of large resistance, small opening angle and the like in the opening process, and is not beneficial to rapid smoke exhaust.

Therefore, improvements are needed.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a valve clack opening and closing device and a valve clack opening and closing method of a fireproof check valve, which adopt a plurality of elastic pieces to cooperatively cooperate in the opening and closing processes of a valve clack to realize a relay effect and have the advantages of small resistance in the opening process, large opening angle and smooth closing.

The first purpose of the invention is to provide a valve clack opening and closing device of a fireproof check valve, which comprises a valve clack, a valve shaft, a first elastic piece and a second elastic piece, wherein the valve clack is rotatably arranged on the valve shaft, the first elastic piece and the second elastic piece are sequentially arranged on a rotating path of the valve clack, and are sequentially acted on the first elastic piece and the second elastic piece in the continuous opening process of the valve clack, so that the first elastic piece and the second elastic piece are pressed to generate deformation, and the valve clack is closed by utilizing the resilience acting force generated by the second elastic piece and the first elastic piece in the continuous closing process of the valve clack.

In the above technical solution of the present invention, during the opening and closing process of the valve flap, the cooperation between the first elastic member and the second elastic member generates a similar "relay" effect, so that the valve flap is not only easy to open but also easy to close, specifically: the smaller the torque of the first elastic part is, the easier the valve flap is to open under the action of air flow (discharged from a room) pressure, but when the opening angle of the valve flap is larger, the valve flap is difficult to close under the influence of the self weight of the valve flap, at the moment, by virtue of the relay action of the second elastic part, when the opening angle of the valve flap is larger, the second elastic part is compressed, and the second elastic part and the first elastic part act together in the closing process of the valve flap to promote the closing of the valve flap, so that the phenomenon that the traditional valve flap cannot be closed due to the influence of the gravity of the valve flap when the valve flap is opened at a larger angle is avoided.

As another specific embodiment of the present invention, the first elastic element is a torsion spring, which is sleeved on the valve shaft and is always in a compressed state.

As another specific embodiment of the present invention, the second elastic member is a torsion spring, which is sleeved on the valve shaft, wherein an original angle between two torsion legs in the second elastic member is smaller than an original angle between two torsion legs in the first elastic member, and the valve flap opened to a set angle abuts against the second elastic member and compresses the second elastic member.

The original angle between the two torsion legs is the initial angle of the torsion spring when the torsion spring is not subjected to an external force.

As another embodiment of the present invention, the second elastic member is a straight spring, and the second elastic member is inclined upward toward the valve flap, wherein the valve flap opened to the set angle abuts against the second elastic member and compresses the second elastic member.

As another specific embodiment of the present invention, the setting angle of the valve flap against the second elastic member is adjustable.

As another specific embodiment of the present invention, the valve further includes a third elastic member, the third elastic member is a torsion spring, and the third elastic member is sleeved on the valve shaft, wherein an original angle between two torsion legs of the third elastic member is smaller than an original angle between two torsion legs of the second elastic member.

The scheme is an expansion scheme with three elastic pieces, and aims to explain that more elastic pieces can be expanded and used as required so as to meet the requirement of forming a relay effect in stages and finally realize the smooth opening and closing process of the valve clack.

As another specific embodiment of the present invention, the valve further includes a supporting shaft parallel to or coincident with the valve shaft, and the second elastic member is a torsion spring, and is sleeved on the supporting shaft.

As another embodiment of the present invention, the fire check valve has a valve seat inclined toward a front side of the valve flap, and the valve flap closed on the valve seat is inclined, wherein the valve flap does not contact the second elastic member until the valve flap continues to be opened to the vertical state.

The second objective of the present invention is to provide a method for opening and closing a valve flap of a fireproof check valve, wherein two or more elastic members are sequentially disposed on a rotation path of the valve flap, wherein during exhausting, the valve flap is rotated forward to open and sequentially presses the two elastic members, and when exhausting is completed, the valve flap is closed by using a rebound force generated by the two elastic members.

In another embodiment of the present invention, one of the elastic members is always in a compressed state during the opening and closing of the valve flap, and the other elastic member is always in a compressed state after the valve flap is opened beyond a predetermined angle.

The invention has the following beneficial effects:

in the process of opening and closing the valve clack, the first elastic piece and the second elastic piece cooperate to generate a relay-like effect, so that the valve clack is easy to open and close, and has the advantages of small resistance, large opening angle, smooth opening and closing and the like in the opening process.

The present invention will be described in further detail with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic view of a valve flap opening and closing apparatus according to embodiment 1 of the present invention;

FIG. 2 is a schematic view of a valve flap opening and closing apparatus according to embodiment 2 of the present invention;

FIG. 3 is a first schematic structural diagram of a fire check valve according to embodiment 3 of the present invention;

FIG. 4 is a schematic structural diagram of a second fireproof check valve according to embodiment 3 of the present invention;

FIG. 5 is a cross-sectional view of a fire check valve according to embodiment 3 of the present invention;

FIG. 6 is a schematic view of the back side of the valve flap of example 3 of the invention;

FIG. 7 is a schematic view of the first and second elastic members cooperating with the valve shaft according to embodiment 3 of the present invention;

fig. 8 is a side view of fig. 7.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.

Example 1

The present embodiment provides a valve flap opening and closing apparatus of a fire check valve, as shown in fig. 1, the valve flap opening and closing apparatus includes a valve flap 101, a valve shaft 102, a first elastic member 103, and a second elastic member 104;

the valve flap 101 is rotatably disposed on the valve shaft 102 to be opened by the exhaust gas (having a certain pressure) during the exhaust, and the valve flap 101 rotates around the valve shaft 102 to perform the exhaust operation.

In this embodiment, the valve flap 101 is opened by rotation, and the first elastic member 103 and the second elastic member 104 are sequentially disposed on a rotation path of the valve flap 101, specifically, the first elastic member 103 and the second elastic member 104 are torsion springs disposed on the valve shaft 102 or other supporting shafts, wherein the first elastic member 103 and the second elastic member 104 may be disposed on the same shaft or on different shafts.

The first elastic member 103 and the second elastic member 104 are sequentially contacted with each other and act on the first elastic member 103 and the second elastic member 104 during the continuous opening process of the valve flap 101, so that the first elastic member 103 and the second elastic member 104 are pressed to deform, and the second elastic member 104 and the first elastic member 103 generate a rebound force to close the valve flap 101 during the continuous closing process of the valve flap 101.

The first elastic piece 103 and the second elastic piece 104 form a relay effect, when exhausting, the pressure of exhausted gas (from a range hood or an exhaust fan) is increased and acts on the valve flap 101 from the front side of the valve flap 101, the valve flap 101 starts to open, in the first stage of opening the valve flap 101, the valve flap 101 only acts on the first elastic piece 103 (the elastic effect of the first elastic piece 103 needs to be overcome), and at the moment, the valve flap is not contacted with the second elastic piece 104, and in the process, the first elastic piece 103 is continuously pressed; as the valve flap 101 continues to open in the second phase, the valve flap 101 contacts the second elastic member 104, and in the process, the first elastic member 103 is still continuously pressed, and the second elastic member 104 is also continuously pressed;

when the exhaust is finished, the pressure of the exhaust gas (from a range hood or an exhaust fan) disappears, the formed exhaust balance is damaged, the valve flap 101 starts to be closed, at the first closing stage of the closing of the valve flap 101, the valve flap 101 simultaneously compresses the first elastic piece 103 and the second elastic piece 104, the rebounding acting force of the second elastic piece 104 and the first elastic piece 103 simultaneously acts on the valve flap 101, and then the gravity influence of the valve flap 101 with a larger opening angle can be overcome, and the valve flap 101 is reversely rotated and closed; as the valve flap 101 is continuously closed, the valve flap 101 is separated from the second elastic element 104, and the second elastic element 104 no longer generates a rebound force on the valve flap 101, and the opening angle of the valve flap 101 is already small; in the second closing phase of the flap 101, the flap 101 is finally completely closed and brought into sealing engagement with the valve seat by the first resilient element 103.

In this embodiment, the first elastic member 103 and the second elastic member 104 similar to a relay are arranged, so that the problems that the opening angle of the valve flap 101 is small and the valve flap 101 is difficult to close due to irregular change of gravity in the opening process of the valve flap 101 can be effectively solved, and the valve flap 101 is not only easy to open but also easy to close, specifically: the smaller the torque of the first elastic member 103, the easier the valve flap 101 is to open under the air pressure, but when the opening angle of the valve flap 101 is large, the valve flap 101 is difficult to close, and at this time, by the relay action of the second elastic member 104, when the opening angle of the valve flap 101 is large, the second elastic member 104 is compressed, and the second elastic member 104 cooperates with the first elastic member 103 to urge the valve flap 101 to close during the closing of the valve flap 101.

Example 2

The present embodiment provides a valve flap opening and closing device of a fire check valve, as shown in fig. 2, the present embodiment is different from embodiment 1 in that the first elastic member 203 in the present embodiment is a torsion spring disposed on the valve shaft 202 or other support shaft, and the second elastic member 204 is a straight spring disposed on the back side of the valve flap 201 and inclined toward the valve flap.

Wherein the second elastic member 204 is compressed when the valve flap 201 is continuously opened to a position close to the maximum position, and when the exhaust is completed, the valve flap 201 is driven to rotate reversely by the second elastic member 204 and is driven to be completely closed by the movement of the first elastic member 203 which still keeps rotating reversely after the second elastic member 204 is separated from the valve flap 201.

Example 3

The present embodiment provides a fire-resistant check valve, as shown in fig. 3 to 8, which includes a valve seat 310, a valve housing 320, and a valve flap opening and closing device 330, the valve flap opening and closing device 330 being disposed in the valve housing 320 and performing a venting operation in cooperation with the valve seat 310.

The valve flap opening and closing device 330 includes a valve flap 331, a support 332, a valve shaft 333, a first torsion spring 334, a second torsion spring 335, and a tower spring 336.

The support 332 is disposed on the bottom wall of the valve housing 320, the valve shaft 333 is disposed on the support 332, the first torsion spring 334 and the second torsion spring 335 are both sleeved on the valve shaft 333, and the tower spring 336 is disposed on the support 332, located on the back side of the valve flap 331, and inclined toward the valve flap 331.

Specifically, the original angle between the two torsion pins in the second torsion spring 335 is smaller than the original angle between the two torsion pins in the first torsion spring 334, and the valve flap 331 opened to the set angle abuts against the movable torsion pin of the second torsion spring 335 and compresses the second torsion spring 335.

Preferably, as shown in fig. 7, the fixed torsion leg of the first torsion spring 334 is fixedly connected with the fixed torsion leg of the second torsion spring 335, so as to achieve the "relay" operation.

Wherein the first torsion spring 334 is always in a compressed state.

In this embodiment, a setting angle of the valve flap 331 against the second torsion spring 335 is adjustable, the setting angle is, for example, 30 °, and when three torsion springs are used in other preferred examples, the setting angle may also be, for example, 20 °, and specifically, the setting angle may be adaptively adjusted to a proper size according to the type of the elastic acting force of the torsion springs to meet design requirements.

As is well known, during the opening process of the valve flap 331, the acting force variation of the single elastic member is balanced (i.e. the stiffness coefficient of the elastic member is constant), while the variation of the gravitational moment of the valve flap 331 is unbalanced along with the variation of the opening angle during the opening process, which is a main contradiction point that the prior art is difficult to satisfy that the valve flap 331 is opened smoothly and the valve flap 331 is closed smoothly; in the embodiment, a plurality of elastic pieces are adopted to form a relay-like effect, so that the main contradiction can be effectively solved.

More specifically, in this embodiment, the valve flap 331 that is nearly fully opened can be in contact with the tower spring 336, and at this time, in addition to the effect similar to "relay" realized by the tower spring 336 indicated in embodiment 2, the maximum opening angle of the valve flap 331 can be changed by adjusting the contact position between the tower spring 336 and the valve flap 331, so as to adapt to the opening angles required by different floors.

In the present embodiment, the valve seat 310 is preferably inclined downward toward the front side of the valve flap 331, as shown in fig. 5, the closed valve flap 331 is inclined, and preferably, before the valve flap 331 is continuously opened to the vertical state, there is no contact between the valve flap 331 and the second torsion spring 335; accordingly, the conventional technical effects of the present invention can be achieved by the valve seat 310 having other structures, and the inclined valve seat 310 in the present embodiment is only a preferred solution, and does not limit the specific structural form of the valve seat 310.

The inclined valve seat 310 can provide a gravity closing effect for the closed valve clack 331, so that better sealing is formed by matching the first torsion spring 334 after the exhaust is completed; meanwhile, when the valve clack 331 is opened at a certain angle (the valve clack 331 is in a vertical position), the gravity of the valve clack 331 is opposite to the resilience acting force of the first torsion spring 334, the opening of the valve clack 331 can be aggravated by overcoming the action of the first torsion spring 334, and the continuously opened valve clack 331 can compress the second torsion spring 335, so that the valve clack 331 is beneficial to having a larger opening angle;

when the valve flap 331 is opened to a position close to the maximum opening angle, the valve flap 331 abuts against the tower spring 336 and compresses the tower spring 336 until exhaust balance is formed, at this time, once exhaust is completed, the acting force of the exhausted airflow on the valve flap 331 disappears, the balance state is broken, at this time, under the synergistic action of the tower spring 336, the second torsion spring 335 and the first torsion spring 334, closing is started while overcoming the gravity of the valve flap 331, the valve flap 331 is separated from the tower spring 336 and keeps closed, under the synergistic action of the second torsion spring 335 and the first torsion spring 334, closing is continued while continuously overcoming the gravity of the valve flap 331, when the valve flap 331 is closed to a certain angle (the valve flap 331 is in a vertical position), the second torsion spring 335 is separated from the valve flap 331, the second torsion spring 335 does not act any more, under the action of the first torsion spring 334, the valve flap 331 is continuously closed, at this time, the gravity and the rebound acting force of the first torsion spring 334 are in the same direction, so as to accelerate the closing process of the valve flap 331, until the flap 331 is fully closed.

A specific valve flap opening and closing process in this embodiment is as follows:

a first opening stage: the valve flap 331 is opened and rotated by a certain angle (for example, 15 °, the valve flap 331 is in a vertical position), and at this time, the valve flap 331 rotates in a forward direction to compress the first torsion spring 334 while overcoming the self-gravity of the valve flap 331, and the second torsion spring 335 and the tower spring 336 do not work;

and a second starting stage: the valve clack 331 is continuously opened to abut against the movable torsion pin of the second torsion spring 335, at this time, under the action of the gravity of the valve clack 331, the valve clack 331 continuously rotates in the positive direction and simultaneously compresses the first torsion spring 334 and the second torsion spring 335, and the tower spring 336 does not work;

and a third opening stage: the valve flap 331 continues to open against the tower spring 336, at which point the valve flap 331 approaches the maximum open position and exhaust balance is established, at which point the tower spring 336, the first torsion spring 334, and the second torsion spring 335 are all compressed.

A first closing stage: when the exhaust is finished, the pressure of the exhaust gas (from the range hood or the exhaust fan) disappears, the balance is broken, and at the moment, under the synergistic action of the tower spring 336, the first torsion spring 334 and the second torsion spring 335, the valve clack 331 overcomes the self gravity to reversely rotate until the valve clack is separated from the tower spring 336;

and a second closing stage: the valve clack 331 is continuously closed to be separated from the movable torsion pin of the second torsion spring 335, at the moment, the valve clack 331 is closed to be close to the vertical position by overcoming the self gravity, the influence of the gravity is small, at the moment, the second torsion spring 335 does not work any more, and the valve clack 331 can be maintained to continuously rotate reversely under the action of the first torsion spring 334;

and a third closing stage: the valve flap 331 continues to close until the vertical position is exceeded, at which time under the force of the weight of the valve flap 331, the first torsion spring 334 continues to drive the valve flap 331 to close until the valve seat 310 is closed, and the connection tightness between the valve flap 331 and the valve seat 310 is maintained based on the cooperation between the weight of the valve flap 331 and the first torsion spring 334.

Nothing in this embodiment is applicable to the prior art, such as fire protection actuators and flap structures.

Example 4

The embodiment provides a valve flap opening and closing method of a fireproof check valve, which is implemented by the valve flap opening and closing device provided in embodiment 1 or embodiment 2, and specifically, the valve flap opening and closing method includes: two or more elastic pieces are arranged on the rotation path of the valve clack in sequence, when the exhaust is finished, the valve clack rotates forwards to open and compresses the two elastic pieces in sequence, and when the exhaust is finished, the valve clack is closed by utilizing the rebounding effect of the two elastic pieces.

Furthermore, one elastic piece is always in a compressed state in the opening and closing processes of the valve clack, and the other elastic piece is always in a compressed state after the valve clack is opened to exceed a set angle.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that changes may be made without departing from the scope of the invention, and it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.