CN112443684A - Actuating mechanism for non-return fire-proof valve - Google Patents
Actuating mechanism for non-return fire-proof valve Download PDFInfo
- Publication number
- CN112443684A CN112443684A CN201910835943.9A CN201910835943A CN112443684A CN 112443684 A CN112443684 A CN 112443684A CN 201910835943 A CN201910835943 A CN 201910835943A CN 112443684 A CN112443684 A CN 112443684A
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- China
- Prior art keywords
- support
- support shaft
- valve
- locking
- plate
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/03—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/36—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position
- F16K17/38—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position of excessive temperature
- F16K17/383—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position of excessive temperature the valve comprising fusible, softening or meltable elements, e.g. used as link, blocking element, seal, closure plug
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K35/00—Means to prevent accidental or unauthorised actuation
Abstract
The invention discloses an actuating mechanism for a non-return fireproof valve, which comprises a support, wherein a support shaft which is relatively fixed with the support is arranged on the support, a locking and pressing disc which can only slide up and down along the support shaft is sleeved on the support shaft, a pressure disc pressure spring is sleeved on the support shaft between the locking and pressing disc and the support, a valve plate pressing strip which corresponds to the locking and pressing disc is hinged to one end, close to the locking and pressing disc, of the support shaft on one side, a hot melting sheet which extends to the locking and pressing disc and can be melted or separated at a set temperature is arranged at the position of the support, the locking and pressing disc and the hot melting sheet are interlocked, a valve plate pressing strip guide groove which is inwards arranged is arranged along one side, opposite to the outer side, of the locking and pressing disc, a clamping. The invention is applied to the non-return fire-proof valve in the air duct or the longitudinal public flue gas duct, and the actuating mechanism enables the valve plate in the opening state to be forcibly closed and to be in the locking closing state, thereby protecting the life safety of residents.
Description
Technical Field
The invention relates to a fire-proof valve, in particular to an actuating mechanism for a check fire-proof valve.
Background
The ventilation equipment is indispensable in modern society building, because the wind channel is the important part of building ventilation equipment, and the fire prevention valve in the wind channel is wherein important component, and the fire prevention valve includes the valve body, is equipped with the valve block that can open in the valve body. When the temperature of the smoke in the air duct reaches a certain value, the valve plate should be closed to block smoke and fire. In the kitchen that uses vertical public flue, in order to prevent the oil smoke among the flue from flowing back into the kitchen in, generally all set up such device as flue fire damper between smoke ventilator's the mouth of pipe of giving vent to anger and public flue, current flue fire damper, generally include the flue that comprises the shell, this flue has relative air intake and air outlet, the mouth of pipe of giving vent to anger of connecting smoke ventilator on the air intake, the air outlet stretches into in the public flue, be provided with the valve block that can open and close at flue air outlet department, the valve block is articulated on the flue for a slice or two through the valve block pivot, the air outlet side is provided with the high temperature closing device that enables the valve block and force to close. When the range hood is not used, the valve plate is in a closed position due to the gravity of the valve plate and covers the air outlet part; when the range hood is used, the valve plate is in the opening position, and the valve plate is far away from the air outlet. As a plurality of users share one longitudinal public flue gas channel, once a fire disaster happens to one user, a large amount of high-temperature harmful gas flows into the longitudinal public flue gas channel, and if a valve plate in a flue fire damper is not closed in time, the large amount of high-temperature harmful gas can enter the user using the range hood through the flue gas channel of the flue fire damper, so that the life safety of the user is threatened. The outer end face of an air outlet end of an existing flue fire damper is provided with a high-temperature closing device capable of enabling a valve block to be forcibly closed towards an air inlet side at a set temperature, and when the temperature of smoke in a public flue is in a very high emergency state and the temperature of the smoke in the public flue reaches a set warning temperature, the valve block in an open state is forcibly closed by the high-temperature closing device. But the high temperature closing means on the current flue fire prevention valve all adopts the strength of spring to close the valve block, lasts high temperature to the certain time in public flue gas channel, and the spring loses because of high temperature inefficacy, and the valve block loses the restrictive force of spring, can be opened once more, and high temperature harmful gas can be gushed into user's family to threaten resident family's life safety.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an actuating mechanism for a non-return fire-proof valve, which can forcibly close a valve plate of the fire-proof valve when the temperature of smoke in a public smoke flue is in a very high emergency state, and the valve plate of the non-return fire-proof valve is always in a closed state.
The support comprises a support, and is structurally characterized in that a support shaft fixed relative to the support is arranged on the support, a locking and pressing disc capable of sliding up and down along the support shaft is sleeved on the support shaft, a pressure disc pressure spring is sleeved on the support shaft between the locking and pressing disc and the support, a valve plate pressing strip corresponding to the locking and pressing disc is hinged to one end, close to the locking and pressing disc, of the support shaft on one side, a hot melting sheet extending to the locking and pressing disc and capable of melting or separating at a set temperature is arranged at the position of the support, the locking and pressing disc and the hot melting sheet are interlocked, a valve plate pressing strip guide groove arranged inwards is arranged along one side, opposite to the outer side, of the locking and pressing disc, a clamping groove is formed in the inner side of the valve plate pressing strip guide groove.
The support comprises a cross arm, one end of the cross arm is provided with a supporting leg, a supporting shaft mounting hole is formed in the cross arm of the support, and one end of the supporting shaft is inserted into the supporting shaft mounting hole.
The mounting hole is a non-circular hole, and the insertion section of the support shaft on the cross arm of the bracket has a shape corresponding to the mounting hole of the support shaft.
The other end of the cross arm is also provided with a supporting leg, and the end part of the supporting leg is provided with a supporting leg which is relatively folded outwards.
And an outward flange is arranged on the opposite outer side of the valve plate pressing strip.
The whole lock pressing disc is roughly in a strip plate shape, a hole sleeved with a supporting shaft is formed in the middle of the lock pressing disc, a valve plate pressing strip guide groove arranged inwards is formed in one end of the lock pressing disc in the length direction, a clamping groove is formed in the inner end, opposite to the clamping groove, of the pressing strip guide groove, a clamping jaw is arranged on one side of the lock pressing disc in the width direction, and the clamping groove and the guide groove are separated by a partition strip.
The joint of the valve plate pressing strip guide groove and the clamping groove is bent downwards along the length direction of the locking pressing disc.
The hot melting piece is a bimetallic strip formed by welding two metal pieces through welding materials which can be melted at a set temperature.
The hot melt sheet is a nonmetal hot melt sheet which can be melted or separated at a set temperature.
The non-metal hot melt sheet is made of engineering plastics or nylon materials.
After the structure is adopted, the support shaft is arranged on the support, the lock pressing disc is sleeved on the support shaft, the pressure disc pressing spring is sleeved on the support shaft between the lock pressing disc and the support, the valve block pressing strip corresponding to the lock pressing disc is hinged to one side of one end, close to the lock pressing disc, of the support shaft, when the hot melt sheet is heated to reach a set temperature and is melted or separated, the lock pressing disc is separated from the constraint of the hot melt sheet, the lock pressing strip is pressed to the valve block pressing strip in a sliding mode along the support shaft under the action of the pressure disc pressing spring, the clamping hook on the valve block pressing strip forms a sliding groove with the inner side face, opposite to the valve block pressing strip, in the unfolding process of the valve block pressing strip, the outer edge of the partition strip between the clamping groove and the. The locking and pressing disc presses the two valve plate pressing strips and enables the two valve plate pressing strips to be opened outwards to press the valve plates of the fire-proof valve, and the valve plates are always in a closed state because the valve plate pressing strips are in a locked state. The actuating mechanism for the non-return fire-proof valve is applied to the fire-proof valve in the air duct or the longitudinal public flue gas duct, when the temperature of flue gas in the air duct or the public flue gas duct is in a high emergency state and reaches a set warning temperature, the actuating mechanism enables the valve plate in the open state to be forcibly closed, and the valve plate of the fire-proof valve is always in the locking closed state, so that the life safety of residents is protected.
Drawings
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the cross-sectional structure A-A of FIG. 1;
FIG. 3 is a schematic structural view of the locking plate of FIG. 1;
FIG. 4 is a state diagram of the valve plate bead of FIG. 2 shown in an open position;
FIG. 5 is a schematic structural diagram of another embodiment of the present invention;
FIG. 6 is a schematic structural diagram of an embodiment of the present invention;
FIG. 7 is a schematic diagram of a structure shown on the right of FIG. 6;
FIG. 8 is another schematic view of the right side view of FIG. 6;
fig. 9 is a schematic diagram of another structure as viewed from the right in fig. 6.
Detailed Description
Referring to the attached drawings, the actuating mechanism for the non-return fire-proof valve comprises a support 1, and a support shaft 3 is arranged on the support 1. The support 1 comprises a cross arm, one end of the cross arm is provided with a supporting leg, the supporting shaft 3 is installed on the cross arm, the other end of the cross arm can also be provided with the supporting leg, and the end part of the supporting leg is provided with a supporting leg which is folded outwards relatively, so that the support 1 can be conveniently installed on the corresponding part of the fire-proof valve. One end of the supporting shaft 3 is provided with a threaded section, a supporting shaft mounting hole is arranged on a cross arm of the bracket 1, the supporting shaft mounting hole is generally a non-circular hole, the supporting shaft mounting hole can be a square hole, a triangular hole, a polygonal hole or an elliptical hole, the supporting shaft 3 is correspondingly provided with an inserting section on the cross arm of the bracket 1, the length of the inserting section is the same as the thickness of the cross arm, the cross section shape of the inserting section corresponds to the shape of the supporting shaft mounting hole, one end of the supporting shaft 3 with the threaded section penetrates out of the supporting shaft mounting hole and then is fixed on the cross arm of the bracket 1 through a nut, so that; the supporting shaft mounting hole can be a circular hole, and the supporting shaft 3 and the cross arm of the bracket 1 can be relatively fixedly connected in a welding mode. The supporting shaft 3 is sleeved with a locking pressure plate 7 which can only slide up and down along the supporting shaft, the supporting shaft 3 can be in a cylindrical, square, polygonal or elliptic cylindrical shape, the locking pressure plate 7 is provided with an inner hole matched with the cross section shape of the supporting shaft 3, the supporting shaft 3 between the locking pressure plate 7 and the support 1 is sleeved with a pressure plate pressure spring 2, the support 1 is provided with a hot melt sheet 5 which extends to the locking pressure plate 7 and can be melted or separated or broken at a set temperature, the hot melt sheet 5 can be a hot melt wire, the hot melt sheet 5 can be in a sheet, strip, cylindrical shape and the like, and in practical application, the hot melt sheet 5 can also be replaced by a non-metal material, for example, engineering plastics or nylon and other materials which can be melted or separated or broken at the set temperature are. The locking pressure plate 7 is provided with a claw 6 which extends to the hot melt sheet 5 and is clamped on the hot melt sheet 5, the hot melt sheet 5 is correspondingly provided with a clamping groove for clamping the claw 6, or the hot melt sheet 5 is provided with a claw which extends to the locking pressure plate 7 and is clamped on the locking pressure plate 7, and the locking pressure plate 7 is provided with a clamping hole or a clamping groove which corresponds to the claw, so that the locking pressure plate 7 and the hot melt sheet 5 form a mutual locking relation. In this embodiment, the thermal fuse 5 is a bimetal formed by welding two metal sheets with a welding material that can be melted at a set temperature, or a bimetal formed by inserting a pin or a card made of a thermal fuse material that can be melted at a set temperature, the bimetal is in a crank arm shape, one of the crank arms is provided with a mounting hole corresponding to the mounting hole of the support shaft of the support 1, the bimetal is sleeved on the support shaft 3, the support shaft 3 is fixed on the support 1 through a nut, and of course, the bimetal can be directly mounted on the support. One end of the support shaft 3 close to the lock pressing disc 7 is hinged with a valve plate pressing strip 9 corresponding to the lock pressing disc 7 on one side, a notch is formed in the end portion of the support shaft 3, the valve plate pressing strip 9 is hinged in the notch through a hinge shaft 8, the valve plate pressing strip 9 is one, the free end of the valve plate pressing strip 9 is in a cutter head shape, an outward flange is arranged on the opposite outer side of the valve plate pressing strip 9, and the flange protrudes out of the opposite outer side face of the valve plate pressing strip 9. A valve plate pressing strip guide groove 11 which is arranged inwards is formed in one side, opposite to the outer side, of the locking pressing disc 7, a clamping groove 10 is formed in the inner side of the valve plate pressing strip guide groove 11, and a clamping hook 4 which is clamped in the clamping groove 10 is arranged on the valve plate pressing strip 9. Referring to fig. 2 and 3, the locking pressure plate 7 is substantially strip-shaped, a hole which is sleeved with the support shaft 3 is formed in the middle of the strip-shaped locking pressure plate 7, the hole can be a round hole, a square hole, a triangular hole, a polygonal hole or an elliptical hole, a valve plate depression bar guide groove 11 which is arranged inwards is formed in one end of the strip-shaped locking pressure plate 7 in the length direction, a clamping groove 10 is formed in the inner end of the valve plate depression bar guide groove 11, the clamping groove 10 and the guide groove 11 are separated by a partition strip, a clamping jaw 6 is arranged on one side of the strip-shaped locking pressure plate 7 in the width direction, the joint of the valve plate depression bar guide groove 11 and the clamping groove 10 is bent downwards (bent towards one end of the notch of the support shaft 3) in the length direction of the locking pressure plate 7. When the valve plate pressing strip 9 is in a locking state, a clamping hook 4 (located on the opposite inner side of the valve plate pressing strip 9 at the moment) arranged on the valve plate pressing strip 9 is clamped in a clamping groove 10 of the locking plate 7, the valve plate pressing strip 9 is located in a guide groove 11, and the clamping groove 10 and the guide groove 11 are separated by a spacing strip; after the valve plate hold-down strip 9 is opened, the valve plate hold-down strip 9 is approximately in a symmetrical parallel state, and the outer edge of the division bar between the clamping groove 10 and the guide groove 11 is clamped in the clamping hook 4, so that the two valve plate hold-down strips 9 are in a locking state.
Referring to fig. 6-8, a specific application example is shown, which is a non-return fire damper applied to a public flue gas duct, the non-return fire damper includes a mounting plate 12 having a through hole, an air inlet channel 13 is disposed on the front surface of the mounting plate 12, one end of the air inlet channel 13 has an air inlet, the other end is an air outlet, an air outlet end surface 15 is correspondingly disposed on the back surface of the mounting plate 12, an air outlet 16 is disposed on the air outlet end surface 15, a rotatable valve plate 14 corresponding to the air outlet and capable of opening only in the air outlet direction is disposed on the air outlet end surface 15, a boss or a groove facing the outer end surface (the outer end surface facing the air outlet direction of the flue gas duct) is annularly disposed around the air outlet 16, a sealing ring (not shown in the figure) is disposed around the air outlet 16, a bent edge or a protruding strip corresponding to the, the end face 15 of the air outlet end is provided with a valve seat 17, and the valve plate 14 is hinged on the valve seat 17. The sealing ring is sleeved on the edge of the air outlet, so that the opening and closing noise of the valve plate can be reduced, the sealing is relatively kept, and the mounting disc 12, the air inlet channel 13 and the air outlet end face 15 are respectively riveted or welded together after being processed and molded. The actuating mechanism for the non-return fire-proof valve is arranged on the back surface of the mounting disc 12, and can be arranged on the air outlet end surface 15. As shown in fig. 7, the valve seat 17 is arranged on the left side of the air outlet end face 15, the left side of the valve plate 14 is hinged on the air outlet end face 15 through the valve seat 17, at this time, the actuating mechanism for the non-return fire-protection valve adopts a single-leg structure, the support legs are arranged on the upper portion of the back face of the mounting disc 12, and of course, the support legs can also be arranged on the upper side of the air outlet end face 15; the valve seat 17 can also be arranged on the right side of the air outlet end face 15, and the right side of the valve plate 14 is hinged on the air outlet end face 15 through the valve seat 17. As shown in fig. 8, the valve seat 17 is disposed on the upper side of the air outlet end face 15, the upper side of the valve sheet 14 is hinged to the air outlet end face 15 through the valve seat 17, at this time, the actuating mechanism for the non-return fire-protection valve adopts a single-leg structure, the legs of the actuating mechanism are mounted on the left side of the back of the mounting plate 12, or on the right side of the back of the mounting plate 12, of course, the legs of the actuating mechanism can also be mounted on the left side or the right side of the air outlet end face 15, or the valve seat 17 is disposed on the lower side of the air outlet end face 15. As shown in fig. 9, the valve sheet on the air outlet 16 is divided into two parts, wherein a smaller part of the valve sheet is fixed on the upper part of the air outlet 16, and a larger part of the valve sheet is hinged on a smaller part of the valve sheet through the valve seat 17, that is, the valve sheet 14 is of an upward opening type, at this time, the actuating mechanism for the non-return fire-protection valve adopts a single-leg structure, the leg thereof is installed on the left side of the back of the installation disc 12, or on the right side of the back of the installation disc 12, and of course, the leg thereof can also be installed on; of course, the valve plate 4 may be left-open or right-open, and at this time, the support legs of the actuating mechanism for the non-return fire-proof valve are correspondingly installed on the back surface of the installation plate 12 or the end surface 15 of the air outlet end. Besides the structure, the structural form of the valve plate can also be a disc-shaped structure. The actuators for the non-return fire-protection valve of the previous embodiment can all adopt a double-leg form. When the temperature of the smoke in the public smoke channel reaches the set warning temperature, the soldering tin between the bimetallic strips is melted, one bimetallic strip falls off from the other bimetallic strip, the locking pressing disc 7 is separated from the constraint of the bimetallic strips and slides along the supporting shaft 3 under the action of the pressing disc pressing spring 2, at the moment, the clamping hook 4 on the valve plate pressing strip 9 and the opposite inner side surface of the valve plate pressing strip 9 form a sliding groove in the unfolding process of the valve plate pressing strip 9, the outer edge of the separation strip slides along the sliding groove, the locking pressing disc 7 presses the valve plate pressing strip 9 and enables the valve plate pressing strip 9 to be opened outwards and pressed on the valve plate 14, and the valve plate 14 is always in a closed state because.
The specific structure of the above embodiments is to illustrate the present invention, not to limit the present invention, and all modifications on the basis of the present invention shall fall into the protection scope of the present invention.
Claims (10)
1. An actuating mechanism for a non-return fireproof valve comprises a support (1) and is characterized in that a support shaft (3) which is relatively fixed with the support (1) is arranged on the support (1), a lock pressure plate (7) which can only slide up and down along the support shaft is sleeved on the support shaft (3), a pressure plate pressure spring (2) is sleeved on the support shaft (3) between the lock pressure plate (7) and the support (1), a valve plate pressing strip (9) which corresponds to the lock pressure plate (7) is hinged to one end of the support shaft (3) close to the lock pressure plate (7) on one side, a hot-melting sheet (5) which extends to the lock pressure plate (7) and can be melted or separated at a set temperature is arranged on the position of the support (1), the lock pressure plate (7) and the hot-melting sheet (5) are interlocked, an inward valve plate pressing strip guide groove (11) is arranged on one side of the outer side, relative to the lock pressure, and a clamping hook (4) buckled in the clamping groove (10) is arranged on the valve plate pressing strip (9).
2. Actuator for non-return fire protection valve according to claim 1, characterized in that said support (1) comprises a cross arm, one end of which is provided with a leg, the cross arm of the support (1) is provided with a support shaft mounting hole, and one end of said support shaft (3) is inserted in the support shaft mounting hole.
3. Actuator for non-return fire protection valve according to claim 2, characterized in that said mounting hole is a non-circular hole and the insertion section of said supporting shaft (3) on the transversal arm of the bracket (1) has a shape corresponding to said supporting shaft mounting hole.
4. The actuator for a non-return fire-protection valve according to claim 2, wherein a leg is provided at the other end of the cross arm, and a leg folded outwardly is provided at an end of the leg.
5. Actuator for non-return fire protection valves according to claim 1, characterised in that the opposite outer sides of the valve plate bead (9) are provided with outward flanges.
6. The actuator for a non-return fire-protection valve according to claim 1, wherein the lock pressing plate (7) is substantially in a strip shape as a whole, a hole fitted with the support shaft (3) is provided in the middle of the lock pressing plate (7), a valve plate bead guide groove (11) provided inward is provided along one end of the lock pressing plate (7) in the length direction, a clamping groove (10) is provided at the opposite inner end of the bead guide groove (11), a claw (6) is provided at one side of the lock pressing plate (7) in the width direction, and the clamping groove (10) and the guide groove (11) are separated by a spacer.
7. The actuator for a non-return fire-protection valve according to claim 6, wherein the joint of the valve plate bead guide groove (11) and the clamp groove (10) is bent downward along the length direction of the lock pressing plate (7).
8. Actuator for non-return fire-protection valve according to any one of claims 1 to 7, characterised in that said thermal fuse (5) is a bimetallic strip obtained by welding two metal sheets through a welding material which is meltable at a set temperature.
9. Actuator for non-return fire-protection valves according to any of claims 1 to 7, characterised in that said thermal fuse (5) is a non-metallic thermal fuse that can be melted or separated at a set temperature.
10. Actuator for non-return fire protection valve according to claim 9, characterized in that said non-metallic thermo-melting sheet (5) is made of engineering plastic or nylon material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910835943.9A CN112443684A (en) | 2019-09-03 | 2019-09-03 | Actuating mechanism for non-return fire-proof valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910835943.9A CN112443684A (en) | 2019-09-03 | 2019-09-03 | Actuating mechanism for non-return fire-proof valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112443684A true CN112443684A (en) | 2021-03-05 |
Family
ID=74733106
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910835943.9A Pending CN112443684A (en) | 2019-09-03 | 2019-09-03 | Actuating mechanism for non-return fire-proof valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112443684A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115479132A (en) * | 2022-09-28 | 2022-12-16 | 杭州西蒙电器有限公司 | Fireproof check valve for public flue |
-
2019
- 2019-09-03 CN CN201910835943.9A patent/CN112443684A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115479132A (en) * | 2022-09-28 | 2022-12-16 | 杭州西蒙电器有限公司 | Fireproof check valve for public flue |
| CN115479132B (en) * | 2022-09-28 | 2023-04-07 | 杭州西蒙电器有限公司 | Fireproof check valve for public flue |
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