Time-delay ventilation device capable of timing

Abstract

The utility model relates to a time-delay ventilation device capable of timing. The time-delay ventilation device comprises a power rotating device, a gear clutch device, a ventilation device and a timing device, the power rotating device is composed of a flywheel, a spring, an air blocking copper pipe and an adjusting piece. The air blocking copper pipe is connected with the adjusting piece through the spring, and the initial deformation quantity of the spring can be changed by changing the position of the adjusting piece in front of and behind the flywheel, so that the rotating speed is controlled. The gear clutch device is composed of a gear shaft, a large gear, a small gear, a spring, an air cylinder, a gear shaft connecting rod and an air cylinder connecting block and is responsible for controlling meshing and separation of the large gear and the small gear. The ventilation device outputs gas when the set time is up, and the timing device is used for timing. And meanwhile, delayed closing can be realized by combining a pneumatic control valve. The explosion-proof device is widely applied to industries such as petroleum, natural gas and chemical engineering needing explosion prevention. For example, in an explosion-proof motor, the timing delay ventilation device can be used for positive pressure purging and increased safety type purging devices, and the safe environment before the motor is started is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to timing equipment field, concretely is a kind of time-delay ventilation device that can be timed. BACKGROUND

[0002] With the continuous acceleration of industrialization, explosion-proof industry plays a key role in high-risk fields such as oil, chemical industry and coal mine. In these industries, the safety and stability of equipment and systems directly affect production efficiency and personnel safety. Therefore, in the selection and application of control elements, explosion-proof performance has become a crucial factor.

[0003] Although traditional control elements, such as electronic timers, can meet basic needs in many situations, they face many limitations in the explosion-proof field. The complexity of electronic components and their sensitivity to electromagnetic interference make them prone to failure in high-risk environments, and even may cause explosions and other serious accidents. Therefore, seeking a control element with superior explosion-proof performance and high reliability has become an urgent need for the explosion-proof industry.

[0004] Under this background, time-delay ventilation device that can be timed emerges as the times require. As a control element powered by air pressure, time-delay ventilation device that can be timed has inherent explosion-proof characteristics. Its working principle is simple and reliable, and does not rely on electronic components, so it is not affected by electromagnetic interference. At the same time, the mechanical structure of time-delay ventilation device that can be timed is solid and durable, and can run stably for a long time in harsh environments, providing strong support for the explosion-proof industry. The relevant device patent literature searched is:

[0005] 1. CN21939978U This patent discloses a pneumatic time-delay device, which relates to a pneumatic device, comprising a base, a mechanical valve mounted on the base, a cylinder mounted on one end of the base, a cylinder joint connected to the piston rod of the cylinder, the cylinder joint is pressed on the end of the valve core of the mechanical valve when the piston rod is extended; a speed regulating throttle valve is installed on the air inlet of the cylinder for controlling the extension speed of the piston rod of the cylinder; the valve body of the mechanical valve is respectively provided with an air inlet, an auxiliary support pipeline interface and a clamp dust blowing pipeline interface, under the movement control of the valve core, the air inlet is respectively connected with the auxiliary support pipeline interface or the clamp dust blowing pipeline interface. The utility model can realize the integration of time delay and dust blowing, the pressing sequence is accurate, the product machining precision can be improved, the machining quality can be guaranteed, the auxiliary blowing time is reduced, the machining capacity is improved, under the condition of the same functional requirements, the air path is simple, and the cost is low.

[0006] 2、CN111963495A The application discloses a kind of pneumatic delay reversing module, including valve body, two delay reversing mechanisms are integrated in valve body, delay reversing mechanism includes two-position three-way reversing valve, check valve and energy storage cavity;Two-position three-way reversing valve includes reversing valve cavity and reversing valve stem, control gas channel that is matched with check valve is provided in valve body, the input of check valve is communicated with control gas channel, the output of check valve is communicated with energy storage cavity, energy storage cavity is communicated with one end of reversing valve cavity, the other end of reversing valve cavity is provided with reset spring that is matched with reversing valve stem;Valve body is also provided with a quick exhaust valve, quick exhaust valve is arranged in one of delay reversing mechanism, quick exhaust valve has a quick exhaust port.The application works, two pneumatic delay reversing mechanisms can keep independent work, and also promote each other in function, so that two execution elements can be controlled to perform sequential staging action simultaneously.The application has simple and reasonable structure, and stable and reliable working performance.

[0007] 3、CN218818321U The utility model discloses a kind of pneumatic delay valve structures, including valve body and valve stem, valve body is provided with chamber, valve stem is retractably installed in chamber and with chamber surrounds first gas cavity and second gas cavity, valve stem can retractably move along first direction;Valve body is also provided with first gas channel and first delay gas channel, the first end of first gas channel penetrates the surface of valve body to constitute first gas inlet, the end of first gas channel penetrates the surface of valve body to constitute first gas outlet, and first gas channel is connected with first gas cavity in communication;One end of first delay gas channel is connected with first gas channel in communication, and the other end of first delay gas channel is connected with second gas cavity in communication.Compared with prior art, delay is not needed in program, reduce the degree of dependence on program control and signal transmission, not only can reduce the regulation and control difficulty, also can improve the use reliability of delay lock, and use cost is lower.

[0008] 4、CN217539702U The utility model provides a kind of pneumatic delay valve, including air inlet, air inlet rear end is sequentially connected with gas storage cavity and pneumatic reversing valve body, air inlet and gas storage cavity are parallelly connected with flow channel and one-way gas passage, and the gas flow direction in one-way gas passage is from gas storage cavity to the direction of inlet;When piston is compressed reset spring under the action of gas chamber gas pressure, gas source input and output are communicated, and reset spring reset drives piston to move to the direction of gas chamber, and exhaust and output are communicated.The utility model structure design is reasonable, by the cooperation design of flow channel and gas storage cavity, the inflation time of pressure rise in the gas storage cavity in control delay ware can be controlled to control the gas path of control delay ware, realizes the requirement of delay control.Simultaneously, through the design of reset spring, the break operation of valve when pressure is insufficient is realized.

[0009] While these patents each bring innovation in pneumatic delay devices and reversing modules, they also have some drawbacks. First, CN21939978U, while integrating delay and dust blowing functions, may lead to reliability decline in high-frequency operation due to its air path design. Second, the two delay reversing mechanisms of CN111963495A can work independently, but their complexity may lead to installation and maintenance difficulties and increase the risk of failure. The design of CN218818321U reduces the dependence on program control, but in practical applications, the reliability of delay locking may still be affected by pneumatic element wear and air pressure fluctuations. Finally, the structure of CN217539702U is reasonable, but the design of the flow regulating channel and the air storage cavity may cause unstable airflow under certain working conditions, affecting the overall performance. Therefore, these patents may face certain limitations and challenges in practical applications. Furthermore, current designs of the timing delay ventilation device do not seem to fully consider the convenience of operation. After the timing period ends, the system lacks an automatic reset function, which means that manual intervention is required for reset operation after each timing is completed. This not only increases the complexity of operation, but also may cause operation delay, affecting the overall work efficiency. Therefore, future designs can consider adding an automatic reset mechanism to improve the automation level and user-friendliness of the timing delay ventilation device. Content of the Utility Model

[0010] The utility model aims at overcoming the deficiency of prior art, provides a kind of delay ventilation device of timing.

[0011] To achieve the above object, the utility model embodiment provides the following technical scheme:

[0012] The application discloses a timing delay ventilation device, which comprises a power rotating device arranged between a bottom plate and a first layer plate, a gear clutch device arranged between the first layer plate and a second layer plate, a ventilation device arranged between the second layer plate and a third layer plate, and a timing device arranged between the third layer plate and a shell; the power rotating device comprises a flywheel connected to the bottom plate, an adjusting sheet arranged on the flywheel, a spring arranged on the flywheel and a gas blocking copper pipe; the gear clutch device comprises a cylinder arranged on the second layer plate, a cylinder connecting block arranged on the second layer plate, a compression spring arranged on a cylinder extension rod, a gear shaft connecting rod arranged on the second layer plate, a gear shaft arranged between the first layer plate and the third layer plate, a pinion arranged on the gear shaft, a central shaft arranged between the second layer plate and the third layer plate, a large gear arranged on the central shaft, a tension spring arranged between the gear shaft connecting rod and a spring connecting sheet, a push rod arranged in the tension spring and a gas pipe arranged between the cylinder connecting block and the bottom plate; the ventilation device comprises a magnetic proximity switch arranged on the third layer plate, a spring connecting sheet arranged between the second layer plate and the third layer plate, a magnetic sheet arranged on the spring connecting sheet and a recess wheel arranged on the central shaft; and the timing device comprises a scale pointer arranged on the central shaft, a scale panel arranged on the third layer plate, an adjustable knob arranged on the shell, a timing pointer arranged on the adjustable knob and a coil spring arranged between the central shaft and the third layer plate.

[0013] Preferably, the air power rotating device is composed of a flywheel, a gas blocking copper pipe, two springs and an adjusting sheet, the flywheel is combined with a spring damping system, and the rotating speed can be not affected by pressure and can be set as required.

[0014] Preferably, the flywheel is internally provided with a cavity structure, one end of the flywheel is provided with a small hole with an inner diameter of 0.5 mm for exhausting gas, and the other end of the flywheel is provided with a long threaded rod with a length of 20 mm for connecting an adjusting ring; gas can enter from a gas inlet at the lower end of the flywheel, flow through the internal cavity of the flywheel, and be stably sprayed into the atmosphere through the small hole.

[0015] Preferably, one end of the flywheel is provided with a small gas exhaust hole with an inner diameter of 0.5 mm, the other end of the flywheel is provided with a long threaded rod with a length of 20 mm, and the rotating shaft at the lower end of the flywheel is a hollow shaft with an inner diameter of 1.5 mm and an internal cavity.

[0016] Preferably, the outer circle of the adjusting sheet connected to one end of the flywheel is provided with 12 through holes with an inner diameter of 0.5 mm at equal intervals, so that the initial deformation amount of the spring can be finely changed, and the rotating speed can be finely adjusted.

[0017] Preferably, the gas blocking copper pipe is provided with two through holes with an inner diameter of 0.5 mm at the top for facilitating connection with the spring, and the gap between the gas blocking copper pipe and the flywheel is 0.1 mm.

[0018] Preferably, the flywheel upper part is provided with a bearing, the bearing is in interference fit with the layer plate, and the flywheel top end is fixed with a gear.

[0019] Preferably, the cylinder is fixed in the cylinder connecting block, the cylinder connecting block is fixed in the layer plate two through screws, the threaded extension rod of the cylinder is provided with a compression spring, the two ends of the compression spring are respectively abutted against the cylinder end and the spring connecting piece, and the threaded extension rod passes through the through hole of the spring connecting piece and is locked and fixed by a nut.

[0020] Preferably, the spring connecting piece is provided with a shaft with a diameter of 4 mm at each of the upper and lower ends, is correspondingly connected with the layer plate two and the layer plate three, the top end of the side surface is provided with a protruding block, cooperates with the groove of the groove wheel to complete the calibration of the timing 0 scale, the upper half of the side surface is provided with a straight slot through hole with a length of 5 mm for connecting the magnetic sheet and controlling the distance between the magnetic sheet and the magnetic proximity switch.

[0021] Preferably, the gear shaft connecting rod one end is provided with a vertical through hole sinking 5 mm perpendicular to the rotation direction, is sleeved on the cylinder extension rod, the cylinder extension rod is provided with a nut for limiting the stroke of the gear shaft connecting rod, the other end of the gear shaft connecting rod is provided with two through holes with a diameter of 2.5 mm, one is in clearance fit with the gear shaft, and the other is connected with the spring connecting piece through a tension spring; the gear shaft has a length of 30 mm, a diameter of 2 mm, and two ends of a patterned straight rod for connecting the gears at the two ends; the nut can move axially along the cylinder extension rod to adjust the meshing degree of the gear; the gear shaft in the gear clutch device has a large gap between the gear hole and the layer plate one, facilitating the meshing of the small gear at the upper end of the gear shaft with the large gear.

[0022] Preferably, the push rod is arranged in the tension spring, when the protruding part of the spring connecting piece enters the groove of the groove wheel, the push rod pushes the small gear away from the large gear, so that the two are no longer meshed; the small gear is arranged at the top end of the gear rod; the large gear is arranged on the central shaft.

[0023] Preferably, the central shaft is arranged between the bearings at the centers of the layer plate two and the layer plate three; the groove wheel is arranged on the central shaft and above the large gear.

[0024] Preferably, the magnetic proximity switch is a magnetic induction type pneumatic proximity switch, which changes the on-off of the gas circuit by sensing the change of the magnetic field; the magnetic proximity switch is arranged on the layer plate two and is excited by the magnetic sheet arranged on the spring connecting piece, and the magnetic proximity switch and the magnetic sheet cooperate to realize the gas on-off function.

[0025] Preferably, the scale pointer is arranged at the top end of the central shaft and is fixed together with the central shaft through a key; the scale panel is arranged on the layer plate one and is connected through a screw, and the screw limits the rotation angle of the scale pointer at the same time.

[0026] Preferably, the adjustable rotating shaft is fixed with the timing pointer through the through hole in the middle of the shell; meanwhile, the rubber pad is arranged between the adjustable knob and the shell, so that the rotation of the adjustable knob has proper damping.

[0027] Preferably, the coil spring is arranged on the third layer plate and the central shaft, the rotation of the central shaft makes the coil spring have pre-tightening force, so that the central shaft always has the tendency of clockwise rotation; the scale pointer is provided with a baffle and rotates counterclockwise under the driving of the central shaft, so as to be attached to the timing pointer with damping.

[0028] Compared with the prior art, the novel design can realize the on-off control of the timing gas, the use of the pneumatic motor can be avoided through the design of the pneumatic rotating device, so that the volume is reduced. Meanwhile, the rotation speed is not affected by the gas flow rate and pressure, and the rotation speed can be freely controlled; the unique design of the gear clutch mechanism can disconnect or engage the gear transmission at appropriate time, so that the timer works reliably; the clever design of the gear transmission system can realize the accurate timing of the timer; through the combination design of the magnetic proximity switch and the magnetic sheet, the timer can quickly realize the on-off. BRIEF DESCRIPTION OF DRAWINGS

[0029] The utility model will be further described in connection with the drawings and specific embodiments.

[0030] Figure 1 It is the structural schematic diagram of the utility model.

[0031] Figure 2 It is the partial enlarged schematic diagram of the power rotating device of the utility model.

[0032] Figure 3 It is the partial enlarged schematic diagram of the gear clutch device of the utility model.

[0033] Figure 4 It is the partial enlarged schematic diagram of the timing device part of the utility model.

[0034] Wherein: 100, power rotating device; 101, single-end threaded rod; 102, adjusting piece; 103, spring; 104, flywheel; 105, air blocking copper pipe; 200, gear clutch device; 201, large gear; 202, gear shaft; 203, gear shaft connecting rod; 204, recessed wheel; 205, small gear; 206, center shaft; 207, nut; 208, compression spring; 209, air cylinder; 210, air cylinder connecting block; 211, push rod; 212, tension spring; 300, timing device; 301, knob; 302, timing pointer; 303, scale pointer; 304, coil spring; 400, rack; 401, bottom plate; 402, layer plate one; 403, layer plate two; 404, layer plate three; 405, shell; 500, time delay ventilation device; 501, magnetic sheet; 502, spring connecting sheet; 503, magnetic proximity switch; DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0036] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , a time delay ventilation device with timing function includes a power rotating device 100, a gear clutch device 200, a timing device 300, a rack 400, and a ventilation device 500.

[0037] The power rotating device 100 includes a single-end threaded rod 101, an adjusting piece 102, a spring 103, a flywheel 104, and an air blocking copper pipe 105 arranged on the flywheel and connected with the spring;

[0038] The gear clutch device 200 includes a large gear 201, a gear shaft 202 arranged on the layer plate one 403, a gear shaft connecting rod 203 arranged on the layer plate two 403, a recessed wheel 204 arranged on the center shaft 207, a small gear 205 arranged on the gear shaft 202, a nut 206 arranged on the air cylinder 209, a center shaft 207 arranged on the layer plate two 403, a spring 208 arranged on the air cylinder 209, an air cylinder 209 arranged on the air cylinder connecting block 210, an air cylinder connecting block 210 arranged on the layer plate two 403, a push rod 211 arranged inside the tension spring 212, and a tension spring 212 arranged on the gear shaft connecting rod 203.

[0039] Timing device 300 includes knob 301, timing pointer 302 arranged on knob 301, scale pointer 303 arranged on central shaft 207, coil spring 304 arranged on central shaft 207;

[0040] Frame 400 includes bottom plate 401, layer plate one 402 arranged on bottom plate 401, layer plate two 403 arranged on layer plate one 401, layer plate three 404 arranged on layer plate two 403, shell 405 arranged on bottom plate 401;

[0041] Ventilation device 500 includes magnetic sheet 501 arranged on spring connecting sheet 502, spring connecting sheet 503 arranged on layer plate two 403 and layer plate three 404, magnetic proximity switch 504 arranged on layer plate three;

[0042] In the embodiment of the utility model, the single end threaded rod 101 is a threaded rod with one threaded end and one smooth end, and the smooth end of the threaded rod is inserted into the hole of the flywheel 104.

[0043] In the embodiment of the utility model, the adjusting piece 102 has threads on the inner ring, which is screwed on the single end threaded rod 101, and the position can be adjusted forward and backward. The outer ring is provided with equidistant 0.5mm small holes for connecting springs.

[0044] In the embodiment of the utility model, the spring 103 is provided with two ends, one end is connected with the adjusting piece 102, and the other end is connected with the copper pipe 105.

[0045] In the embodiment of the utility model, the flywheel 104 is provided with a 1mm through hole at the bottom, the inside is a cavity, the other end of the single end threaded rod 101 is provided with a 0.5mm small hole, and the flywheel 104 is arranged in the bearing between the bottom plate 501 and the layer plate one 502.

[0046] In the embodiment of the utility model, the air blocking copper pipe 105 is provided with two horizontal 1mm small holes at the thick end for connecting springs. The air blocking copper pipe 105 is sleeved on the flywheel 104.

[0047] In the embodiment of the utility model, the large gear 201 is a 0.3 module 112 tooth gear, which is fixedly connected to the central shaft 206.

[0048] In the embodiment of the utility model, the gear shaft 202 is arranged between the layer plate one 402 and the gear shaft connecting rod 203. The gear shaft 202 is connected with a gear at each of the upper and lower ends, and is fixed by glue.

[0049] The embodiment of the utility model discloses gear shaft connecting rod 203 is set up on the axle hole of layer board two 403, one end is connected with tension spring 212, gear shaft 202, one end is equipped with the through -hole of 5mm diameter, is sleeved on the shaft of cylinder 209 that protrudes. Gear shaft connecting rod 203 rotates around the pin shaft of layer board two 403, and the gear of size is engaged and separated in time.

[0050] The embodiment of the utility model discloses the recessed groove wheel 204 outer ring has a recess, is used for and spring connecting piece 502's spring connecting piece is cooperated. The recessed groove wheel 204 center is equipped with irregular through -hole, is used for and center shaft 203 fixed makes them not produce rotation dislocation.

[0051] The embodiment of the utility model discloses pinion 205 is set up in gear shaft 202, and is cooperated with big gear 201, has played the effect of transmitting motion to the scale pointer.

[0052] The embodiment of the utility model discloses center shaft 206 is the optical axis with different steps, is used for the axle end positioning of recessed groove wheel 204 and big gear 201. Center shaft 206 upper end is set up in rectangular through -hole, because and coil spring 304 fixed.

[0053] The embodiment of the utility model discloses nut 207 is set up on the shaft of cylinder 209 that protrudes, is used for blocking the rotation of gear shaft connecting rod 203 and spring connecting piece 502.

[0054] The embodiment of the utility model discloses spring 208 is set up on the shaft of cylinder 209 that protrudes and is located between spring connecting piece 502 and cylinder 209, provides the thrust for the counterclockwise rotation of spring connecting piece 502.

[0055] The embodiment of the utility model discloses cylinder 209 is the needle cylinder of the air -through protruding type, is set up on cylinder connecting block, plays the role of limiting gear shaft connecting rod 203 and spring connecting piece 502 action.

[0056] The embodiment of the utility model discloses cylinder connecting block 210 is set up on layer board two 403, plays the role of fixing cylinder 209 on layer board two 403.

[0057] The embodiment of the utility model discloses push rod 211 is set up in tension spring 212, plays the role of pushing the gear of size apart.

[0058] The embodiment of the utility model discloses tension spring 212 is set up in spring connecting piece 502 and layer board three 404, plays the role of spring connecting piece 502 close recessed groove wheel.

[0059] The embodiment of the utility model discloses the screw rod in the knob 301 middle is equipped with, be used for and the fixed pointer connection.

[0060] The embodiment of the utility model discloses the fixed pointer 302 middle is equipped with the screw thread, is used for with the knob 301 connection fixed.

[0061] The embodiment of the utility model discloses the irregular through -hole of the scale pointer 303 center is equipped with, is used for with the central shaft 303 and is connected fixedly. Scale pointer 303 is equipped with the stopper, makes scale pointer 303 and the fixed pointer 302 carry out the adhesion limit.

[0062] The embodiment of the utility model discloses the one end of the coil spring 304 is connected with the central shaft 303, and one end is connected with the layer board three 504, make the central shaft 303 have the torque of counterclockwise rotation.

[0063] The embodiment of the utility model discloses the bottom plate 401 is equipped with the gas passage to the bearing at the center, provides the gas path connection for the flywheel. Two ends are equipped with the threaded hole for connecting and fixing the shell.

[0064] The embodiment of the utility model discloses the layer board one 402 middle is equipped with the smooth hole with 3mm diameter, is used for the circumferential fixed of flywheel 104.

[0065] The embodiment of the utility model discloses the layer board two 403 is equipped with various different size through -hole, is used for connecting various parts.

[0066] The embodiment of the utility model discloses the layer board three 404 is equipped with various different size through -hole and the protruding pin shaft, is used for connecting various parts.

[0067] The embodiment of the utility model discloses the shell 405 is transparent acrylic plate cemented five -sided body, and the through -hole with 4mm diameter is opened in the center of the upper surface, makes the screw rod of knob 401 can pass. The lower end is equipped with two through -holes, is used for with bottom plate 401 and is connected fixedly.

[0068] The embodiment of the utility model discloses the one end of the coil spring 304 is connected with the central shaft 207, and one end is connected with the layer board three 404, make the central shaft 207 have the torque of counterclockwise rotation.

[0069] The embodiment of the utility model discloses the spring connecting piece 502 is irregular board, and both ends are equipped with the shaft with 3mm diameter, is used for fixed in layer board two 403 and layer board three 404, and rotates around the shaft. The upper part is opened rectangular hole, so as to pass the gearwheel 201. The spring connecting piece 502 is equipped with the protruding block in the middle part, plays the role of cooperation with the recessed wheel 205. The spring connecting piece 502 is equipped with the L type hole with 1mm diameter in the top, is used for connecting the tension spring 212.

[0070] In the embodiment of the utility model, the magnetic proximity switch 503 is a gas on-off switch. When the magnetic sheet 501 is close to the magnetic proximity switch 503, the switch is activated, and the gas circuit is opened. When the magnetic sheet 501 is away from the magnetic proximity switch 503, the gas circuit is disconnected.

[0071] In the embodiment of the utility model, the magnetic sheet 501 is a metal sheet with weak magnetism, which cooperates with the magnetic proximity switch 503 to realize the disconnection or smoothness of the gas passage.

[0072] Next, the action process of the timing delay ventilation device described in the utility model is described in combination with the above structure description. Specifically:

[0073] S1, rotate the knob 301 to set the timing time, at this time, the large gear 201 and the small gear 205 are in a separated state.

[0074] S2, connect the gas source to the device, and the whole system can work. Specifically:

[0075] S21, the power rotating device 100 rotates at the set speed.

[0076] S22, after the air cylinder 209 extends, the nut on the air cylinder extension rod no longer blocks the rotation stroke of the spring connecting sheet 502 and the gear shaft connecting rod 203. The protruding block of the spring connecting sheet 502 is attached to the outer circle of the recessed wheel 204 to rotate. Under the action of the tension spring 212, the instantaneous rotation of the gear shaft connecting rod 203 makes the small gear 201 and the small gear 202 mesh. The rotation of the power rotating device 100 is transmitted to the center shaft 206, thereby driving the scale pointer 303 to rotate.

[0077] S23, the scale pointer 303 rotates, and when the pointer of the scale pointer 303 points to the 0 scale, the spring connecting sheet 502 rotates around the shaft under the action of the tension spring 212. The protruding block of the spring connecting sheet 502 enters the groove of the recessed wheel 302, so that the spring connecting sheet 502 drives the magnetic sheet 501 to approach the magnetic proximity switch 503, and the device is ventilated. At the same time, the spring connecting sheet 502 rotates around the shaft, and the push rod 211 pushes the small gear 205 away from the large gear 201, and the gas passage is opened.

[0078] S3, when the gas is disconnected, the extension rod of the air cylinder 209 is retracted, and the protruding block of the spring connecting sheet 502 is pulled out of the groove of the recessed wheel 204. At the same time, the center shaft 206 rotates clockwise under the action of the coil spring 304, is blocked by the timing pointer, and returns to the set time scale. After ventilation, repeat the above process.

[0079] From the above, the device realizes the function of executing action or switching state after time delay setting, has high work efficiency and strong environmental adaptability.

[0080] The gas time delay device has at least the following beneficial effects:

[0081] 1. The design of the constant speed flywheel realizes stable rotating speed of the device under the premise of reducing the volume, so that the device is accurate and reliable in timing.

[0082] 2. The gear clutch mechanism is designed skillfully, so that the engagement and disengagement of the gear and pinion are accurately controlled, the safety of the internal elements of the device is ensured, and the service life of the device is prolonged.

[0083] 3. Through the setting of the rotating speed of the constant speed flywheel, the design of the gear clutch device and the design of the timing device, the device can be timed within 0-99 minutes, and the use requirements of most scenes are met.

[0084] 4. The device does not have any electronic elements, so that the device can be used in explosion-proof, chemical and other scenes.

[0085] The combination features of the components not described in detail in the specification are well-known technology, and the content is easily determined and indisputable when the utility model is implemented. The above scheme is only a description of the preferred embodiment of the application, but the protection scope of the application is not limited to this. Any person skilled in the art can easily implement the application within the scope described in the application, without changing the basic principle of the claims or replacing it. Any change or replacement should be covered in the protection scope of the application, i.e. the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A timeable delay ventilation device comprising a power rotating device disposed between a base plate and a first layer plate, a gear clutch device disposed between the first layer plate and a second layer plate, a ventilation device disposed between the second layer plate and a third layer plate, and a timing device disposed between the third layer plate and a housing; characterized in that: The power rotating device comprises a flywheel arranged on a bottom plate, an adjusting piece arranged on the flywheel, a spring arranged on the flywheel and a gas blocking copper pipe; the gear clutch device comprises a cylinder arranged on the second layer plate, a cylinder connecting block arranged on the second layer plate, a compression spring arranged on the cylinder extending rod, a gear shaft connecting rod arranged on the second layer plate, gear shafts arranged on the first layer plate and the third layer plate, pinions arranged on the gear shafts, a central shaft arranged on the second layer plate and the third layer plate, a large gear arranged on the central shaft, a tension spring arranged on the gear shaft connecting rod and the spring connecting piece, a push rod arranged in the tension spring and a gas pipe arranged on the cylinder connecting block and the bottom plate; the air supply device comprises a magnetic proximity switch arranged on the third layer plate, a spring connecting piece arranged on the second layer plate and the third layer plate, a magnetic piece arranged on the spring connecting piece and a recess wheel arranged on the central shaft; the timing device comprises a scale pointer arranged on the central shaft, a scale panel arranged on the third layer plate, an adjustable knob arranged on the shell, a timing pointer arranged on the adjustable knob and a coil spring arranged on the central shaft and the third layer plate.

2. A timed delay ventilator according to claim 1, wherein: The flywheel is internally provided with a cavity structure, one end of which is provided with a small hole with an inner diameter of 0.5 mm for exhausting, and the other end is provided with a long threaded rod integrally formed with a length of 20 mm for connecting the adjusting ring. The gas can enter from the gas inlet below the flywheel, flow through the internal cavity of the flywheel, and then be stably sprayed into the atmosphere through the small hole.

3. A timed delay ventilator according to claim 1, wherein: The flywheel is combined with the spring damping system, so that the rotating speed is not affected by the pressure and can be set automatically.

4. A timed delay ventilator according to claim 1, wherein: The gear hole between the gear shaft and the first layer plate in the gear clutch device has a large gap, which facilitates the meshing of the pinion at the upper end of the gear shaft and the large gear.

5. A timed delay ventilator according to claim 1, wherein: The cylinder is fixed in the cylinder connecting block, the cylinder connecting block is fixed on the second layer plate by screws, the threaded extending rod of the cylinder is provided with a compression spring, the two ends of the compression spring abut against the end of the cylinder and the spring connecting piece respectively, and the threaded extending rod passes through the through hole of the spring connecting piece and is locked and fixed by a nut.

6. A timed delay ventilator according to claim 1, wherein: One end of the gear shaft connecting rod is provided with a through hole sinking by 5 mm and perpendicular to the rotating direction, and the other end is provided with two through holes with a diameter of 2.5 mm, one of which is gap-fitted with the gear shaft, and the other is connected with the spring connecting piece through the tension spring; the threaded extending rod is provided with a nut for limiting the stroke of the gear shaft connecting rod, and the nut can move axially along the threaded extending rod to adjust the meshing degree of the large gear and the pinion.

7. A timed delay ventilator according to claim 1, wherein: The spring connecting piece is provided with shafts with a diameter of 4 mm at the upper and lower ends respectively, which are correspondingly connected with the second layer plate and the third layer plate, the top end of the side surface is provided with a protruding block which cooperates with the groove of the recess wheel to complete the calibration of the timing 0 scale, and the upper half of the side surface is provided with a straight slot through hole with a length of 5 mm for connecting the magnetic piece.

8. A timed delay ventilator according to claim 1, wherein: The push rod is arranged in the tension spring, when the protruding part of the spring connecting piece enters the groove of the recess wheel, the push rod pushes the pinion away from the large gear, so that the two are no longer meshed.

9. A timed delay ventilator according to claim 1, wherein: The magnetic proximity switch is a magnetic induction type pneumatic proximity switch which changes the on-off of the gas circuit by sensing the change of the magnetic field.

10. A timed delay ventilator according to claim 1, wherein: The coil spring is arranged between the central shaft and the layer plate, and the central shaft is rotated to make the coil spring have a pre-tightening force, so that the central shaft always has a tendency to rotate clockwise; the scale pointer is provided with a baffle and is rotated counterclockwise under the driving of the central shaft to be attached to the timing pointer with damping.

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