阅读说明：本技术 单弹簧防火止回阀 (Single spring fireproof check valve ) 是由 盛玉平 于 2019-10-30 设计创作，主要内容包括：本发明公开了一种单弹簧防火止回阀,包括阀体、安装于阀体内部的双开门阀片和设于阀体上的自锁装置,所述自锁装置包括定位轴、锁紧阻件、滑动阻件、弹簧、用于连接锁紧阻件的第一立轴、熔断片以及设于定位轴上的滑动装置。自锁装置打开后,锁紧阻件与阀片的垂直锁紧方式使得阀片受力大,不易被大风量吸力打开。本发明具有响应速度快、密封性好、强度高、安全性高的优点。(The invention discloses a single-spring fireproof check valve which comprises a valve body, a double-door valve plate arranged inside the valve body and a self-locking device arranged on the valve body, wherein the self-locking device comprises a positioning shaft, a locking resistance piece, a sliding resistance piece, a spring, a first vertical shaft used for connecting the locking resistance piece, a fuse link and a sliding device arranged on the positioning shaft. After the self-locking device is opened, the valve plate is stressed greatly and is not easy to be opened by large air suction in a vertical locking mode of the locking resistance piece and the valve plate. The invention has the advantages of high response speed, good sealing performance, high strength and high safety.)

1. A single-spring fireproof check valve comprises a valve body (1) and a double-door valve plate (2) arranged inside the valve body, and is characterized by further comprising a self-locking device arranged on the valve body (1), wherein the self-locking device comprises a positioning shaft (4), a locking resistance piece (7), a sliding resistance piece (8), a spring (5), a first vertical shaft (6) used for connecting the locking resistance piece, a fuse link (11) and a sliding device (15) arranged on the positioning shaft; two ends of the positioning shaft (4) are connected with the valve body (1) and are parallel to the vertical beam (3); one end of the first vertical shaft (6) is connected with the positioning shaft (4), and the other end of the first vertical shaft is connected with the valve body (1) and is vertical to the positioning shaft (4); the locking resistance piece (7) comprises two resistance sheets which are symmetrically arranged relative to the positioning shaft (4); one end of the spring (5) is connected with the sliding resistance piece (8), and the other end of the spring is connected with the positioning shaft (4) or the valve body (1); the fuse link (11) closes the locking resistance piece (7); the sliding assembly (8) slides on the sliding device (15) under the action of a spring.

2. Single spring fireproof check valve according to claim 1, wherein the sliding resistance (8) comprises a second vertical shaft (10) to which the sliding resistance is connected and a symmetrical resistance piece or rod about the second vertical shaft; a sliding groove (16) is formed in the vertical beam, one end of the second vertical shaft is connected with a sliding device (15), and the other end of the second vertical shaft is located in the sliding groove (16).

3. Single spring fireproof check valve according to claim 2, characterized in that the sliding block (8) closes when the locking block (7) closes, the sliding block and the locking block each block facing opposite.

4. Single-spring fireproof check valve according to claim 3, characterized in that the fuse link (11) connects the respective blocks of the locking block (7).

5. Single spring fireproof check valve according to claim 4, wherein the self-locking device is provided with a fixing mechanism such that the second vertical shaft (10) is stationary when the locking stop is closed.

6. Single spring fireproof check valve according to claim 2, characterized in that the fuse link (11) connects the respective blocks of the locking block (7) and the sliding block (8).

7. The single-spring fireproof check valve according to claim 2, wherein a torsion spring is provided on the second vertical shaft (10), and two ends of the torsion spring respectively abut against each stopping sheet or rod of the sliding stopper (8) for assisting the sliding stopper to open.

8. The single-spring fireproof check valve according to claim 1, wherein the sliding block (8) comprises a sliding portion and a blocking portion, the sliding portion is disposed on the sliding device, and the blocking portion is disposed below the positioning shaft and perpendicular to the positioning shaft.

9. Single-spring fireproof check valve according to claim 8, characterized in that the fuse link (11) connects the blocking pieces of the locking block (7).

10. The single-spring fireproof check valve according to claim 1, wherein when the valve plate (2) is disposed at a certain angle to the horizontal direction, the bottom edge of the locking stopper (5) is beveled or stepped.

Technical Field

The invention relates to a check valve, in particular to a single-spring fireproof check valve.

Background

In ventilation ducts in public places or in smoke exhaust ducts of range hoods, check valves are usually provided for preventing the spread of high-temperature smoke in case of fire. The double-valve-piece type fireproof check valve has the advantages of small occupied space of the valve piece and large air outlet volume during ventilation, and is often applied to ventilation pipelines or range hoods in public places. In the double-valve-piece single-spring fireproof check valve, the most critical structure is a self-locking device, namely a device for locking the valve piece of the check valve according to the temperature of the airflow of the pipeline. Many check valve self-lock devices utilize spring thrust to lock the valve block, but under high temperature, the spring is inefficacy easily, then leads to the valve block to open, causes the intensity of a fire further to spread. Simultaneously, most single spring fire prevention check valve self-lock device intensity is not high, and self-lock device can hinder the switching of valve block under the daily closed state, influences the air volume.

Disclosure of Invention

The purpose of the invention is as follows: the invention aims to provide a single-spring fireproof check valve with a self-locking device, which has high locking efficiency, small occupied space and high strength and solves the problems.

The technical scheme is as follows: the invention discloses a single-spring fireproof check valve which comprises a valve body, a double-door valve block arranged inside the valve body and a self-locking device arranged on the valve body, wherein the self-locking device comprises a positioning shaft, a locking resistance piece, a sliding resistance piece, a spring, a first vertical shaft used for connecting the locking resistance piece, a fuse link and a sliding device arranged on the positioning shaft.

And two ends of the positioning shaft are connected with the valve body and are parallel to the vertical beam. One end of the first vertical shaft is connected with the positioning shaft, and the other end of the first vertical shaft is connected with the valve body and is perpendicular to the positioning shaft.

The locking stop comprises two stop tabs arranged symmetrically about the positioning axis. One end of the spring is connected with the sliding resistance piece, and the other end of the spring is connected with the positioning shaft or the valve body. The fuse link closes the locking resistor.

The sliding assembly slides on the sliding device under the action of the spring.

The sliding device can be a sliding rod or a sliding hole, when the sliding device is the sliding rod, two ends of the sliding rod are connected with the tail end of the positioning shaft or the valve body, when the sliding device is the sliding hole, the sliding hole is formed in the positioning shaft, and one end of the second vertical shaft or the sliding resistance piece is arranged in the sliding hole.

The sliding resistance piece comprises a second vertical shaft connected with the sliding resistance piece and a resistance sheet or a resistance rod which is symmetrical about the second vertical shaft; the vertical beam is provided with a sliding groove, one end of the second vertical shaft is connected with the sliding device, and the other end of the second vertical shaft is positioned in the sliding groove.

When the locking resistance piece is closed, the sliding resistance piece is closed, and the directions of the sliding resistance piece and each resistance piece of the locking resistance piece are opposite.

The fuse link is connected with each resistance piece of the locking resistance piece.

The self-locking device is provided with a fixing mechanism, so that the second vertical shaft is static when the locking resistance piece is closed.

The fuse link is connected with each resistance piece of the locking resistance piece and the sliding resistance piece.

And a torsion spring is arranged on the second vertical shaft, and two ends of the torsion spring are respectively abutted against each resistance sheet or resistance rod of the sliding resistance piece and used for assisting the sliding resistance piece to be opened.

The sliding resistance piece comprises a sliding part and a blocking part, the sliding part is arranged on the sliding device, the blocking part is arranged below the positioning shaft and is vertical to the positioning shaft, and the fuse link is connected with each resistance piece of the locking resistance piece.

When the valve plate is arranged at a certain angle with the horizontal direction, the bottom edge of the locking resistance piece is inclined or stepped.

Has the advantages that: compared with the prior art, the invention has the following remarkable advantages:

(1) the design of the single tension spring ensures that the resistance piece occupies less space when closed, can ensure that the valve plate of the check valve can be opened to the maximum 90 degrees, and the ventilation volume of the valve body is maximum when the check valve is in the closed state, and when the check valve is applied to electric appliances such as a range hood and the like, the oil smoke discharge amount is larger.

(2) After the resistance piece is opened, the valve plate is stressed greatly and is not easy to open by large air flow suction force in a vertical locking mode of the resistance piece and the valve plate, and meanwhile, the self-locking device is high in closing speed, good in sealing performance, high in strength and high in safety.

Drawings

FIG. 1 is a schematic view of a first embodiment of the present invention in a closed state;

FIG. 2 is a schematic view of a locked state of the first embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a first embodiment of the present invention at A;

FIG. 4 is a first structural schematic view of a securing mechanism at A in accordance with a first embodiment of the present invention;

FIG. 5 is a second structural view of the fixing mechanism at A in the first embodiment of the present invention;

FIG. 6 is a third structural schematic view of a fixing mechanism at A in the first embodiment of the present invention;

FIG. 7 is a first structural schematic diagram of a second embodiment of the present invention;

FIG. 8 is a second structural diagram of the second embodiment of the present invention;

Detailed Description

The technical scheme of the invention is further explained by combining the attached drawings.

Fig. 1 is a first embodiment of single spring fire prevention check valve, including valve body 1, install in the inside two door valve blocks 2 of valve body, be located the perpendicular roof beam 3 of valve block symmetry department and install in the inside self-lock device of valve body 1, self-lock device includes location axle 4, locking piece 7, slip piece 8, spring 5, is used for connecting first vertical scroll 6, the fuse-link 11 that the locking piece hinders and locates the epaxial slider 15 of location.

In this embodiment, the positioning shaft 4 is connected to the valve body 1 at both ends, and is parallel to the vertical beam 3. The positioning shaft is provided with a sliding device 15 which is a sliding rod or a sliding hole. When the sliding device is a sliding rod, two ends of the sliding rod are connected with the tail end of the positioning shaft or the valve body, and when the sliding device is a sliding hole, the sliding hole is formed in the positioning shaft.

One end of the first vertical shaft 6 is connected with the positioning shaft 4, and the other end of the first vertical shaft is connected with the vertical beam 3 and is perpendicular to the positioning shaft 4. The first vertical shaft is provided with a locking resistance piece 7 which comprises two resistance pieces which are symmetrically arranged about the positioning shaft 4. One end of the resistance sheet is provided with a snap ring or a snap hook for connecting the first vertical shaft.

In the closed state of the self-locking device, the sliding block 8 is arranged inside or at the end of each block of the locking block 7. The sliding resistance 8 comprises two resistance tabs or rods symmetrical about the positioning axis 4 and connected to the second vertical shaft 10. And a torsion spring 9 is further arranged on the second vertical shaft, two ends of the torsion spring respectively abut against each resistance sheet or resistance rod of the sliding resistance piece 8, and the torsion spring is used for assisting the sliding resistance piece 8 to open.

As shown in fig. 2, one end of the second vertical shaft 10 is arranged in the slide hole of the positioning shaft, and the other end is arranged in the slide groove 16 on the vertical beam 3. One end of the spring is connected with the sliding resistance piece 8, and the other end of the spring is connected with the positioning shaft 4 or the valve body 1, namely, the tail end 14 of the positioning shaft or the valve body opposite to the direction of each resistance piece of the locking resistance piece in the closed state is connected. When the self-locking device is closed, the spring 5 is in a stretched state. The second vertical shaft 10 slides in the sliding hole under the action of the spring. When the sliding device is a sliding rod, a sliding part can be arranged on the second vertical shaft and is used for connecting the sliding rod and sliding on the sliding rod.

In this embodiment, the fuse link 11 is used to close the locking resistors, and when the fuse link is fused at a high temperature, the resistors are opened, the second vertical shaft 10 moves in the slide hole under the tension of the spring 5, and the slide resistor 8 pushes the locking resistor 7 to open. When the stress of the spring is balanced, the second vertical shaft 10 moves to the tail end of the sliding hole, the locking resistance piece is opened to the maximum opening degree, the locking resistance piece is vertically abutted against the valve plate, the valve is locked, and the state shown in figure 2 is achieved.

In this embodiment, the fuse link 111 connects the locking stop 7 and the respective stops of the second locking assembly 8, as shown in fig. 3. The height of the slide block 8 is higher than that of each block in the locking block 7, and the raised part is provided with a hole 102 for connecting a fuse link 111. The height of the sliding resistance piece 8 can be flush with that of the locking resistance piece 7 or lower than that of the locking resistance piece 7, and when the sliding resistance piece 8 is higher than a part, the closed part of the fuse link 111 can be welded on the upper part of each resistance piece, so that the installation of the fuse link 111 is facilitated.

In this embodiment, the fuse link 112 may further connect each block of the locking block 7, and the self-locking device further includes a fixing mechanism for fixing the sliding block in the closed state. The securing mechanism is in position a in fig. 1.

In the first embodiment of the fixing mechanism shown in fig. 4, a projection 101 is provided on the top edge of the slide stopper 8, and the projection 101 is higher than the fuse link 112. The fuse link 112 closes the locking stop 7 and, under the action of the projection 101, the sliding stop 8 is at rest and the spring is in tension.

In a second embodiment of the fixing mechanism, shown in fig. 5, the height of each tab of the slide stop 8 is lower than the height of the fuse link 112. The locking stop 7 is provided with a stop blade 103 able to abut against each stop blade of the sliding stop 8, making the sliding stop 8 stationary and the spring in tension.

In the third embodiment of the fixing mechanism shown in fig. 6, a second fuse link 104 is provided on the positioning shaft 4 or the vertical beam 3, and the second fuse link 104 is connected to the second vertical shaft, so that the sliding block 8 is stationary and the spring is in a stretched state. The second fuse link 104 and the fuse link 112 are made of the same material, so that all the fuse links can be fused at the same time after the temperature reaches a certain temperature.

Fig. 7 shows a second embodiment of the single-spring fireproof check valve, in which the sliding block 80 includes a sliding portion 81 and a blocking portion 82. The sliding device 15 is a sliding rod or a sliding hole. When the sliding device is a sliding rod, the sliding part 81 is sleeved on the sliding rod and can slide on the sliding rod, as shown in fig. 7. When the sliding device is a sliding hole, the sliding part is embedded in the sliding hole and can slide in the sliding hole.

The blocking part 82 is arranged below the positioning shaft 4 and is perpendicular to the positioning shaft, and the length of the blocking part is less than the distance between the positioning shaft and the vertical beam, namely, the blocking part 82 is arranged in a suspended mode. The fuse link 113 is connected with each link of the locking link 7, and the lower end of the blocking part exceeds the lower end of the fuse link 113, so that in the closed state of the self-locking device, the blocking part 82 can abut against the fuse link 113 or the locking link and is still on the sliding device, and at the moment, the spring is in a stretching state.

One end of the spring 5 is connected with the sliding resistance piece 80, the other end of the spring is connected with the positioning shaft 4 or the valve body 1, and the spring and the positioning shaft are arranged in parallel. When the sliding device is a sliding rod, the spring 5 and the sliding rod 150 are coaxially arranged, so that the occupied space of the self-locking device can be reduced.

When the sliding device is a sliding rod, the spring 5 may also be arranged coaxially with the sliding rod 151, as shown in fig. 8. The sliding part 81 of the sliding block may further be provided with a protruding catch 83 for connecting the spring 5. The spring and the slide bar are arranged in a different shaft mode, so that the spring and the slide bar can be prevented from being touched or rubbed, and the self-locking device is prevented from being opened untimely or at a low opening speed and the like.

In this embodiment, the rest of the structural arrangement is the same as that of the first embodiment.

In the first and second embodiments, a fixing rod 17 may be further disposed between the vertical beam 3 and the positioning shaft for reinforcing the strength of the self-locking device. In the first and second embodiments, when the valve plate has a certain angle with the horizontal direction, the bottom edge of the locking resistance member 7 also has a certain angle with the horizontal direction, the angle is greater than or equal to the included angle between the valve plate and the horizontal direction, and the locking resistance member 7 can also be in a step shape, so as to ensure that each resistance plate can be opened to the extreme end.

In the first and second embodiments, the locking block may also be frame-shaped.

In the first and second embodiments, the spring may also be in a compressed state in the closed state of the self-locking device, that is, one end of the spring is connected with the sliding resistance member, and the other end is connected with the end 13 of the positioning shaft or the valve body along the closing direction of each resistance piece of the locking resistance member. At this time, when the sliding device is a sliding hole, the positioning shaft 4 may further be provided with a sliding channel, which is a closed hollow body, so that the spring can move along a fixed track after the fuse link is fused.

The design of the single tension spring ensures that the resistance piece occupies less space when closed, can ensure that the valve plate of the check valve can be opened to the maximum 90 degrees, and the ventilation volume of the valve body is maximum when the check valve is in the closed state, and when the check valve is applied to electric appliances such as a range hood and the like, the oil smoke discharge amount is larger. After the resistance piece is opened, the valve plate is stressed greatly and is not easy to open by large air flow suction force in a vertical locking mode of the resistance piece and the valve plate, and meanwhile, the self-locking device is high in closing speed, good in sealing performance, high in strength and high in safety.