Fire arresting device for inlet and outlet of vacuum pump

Abstract

The utility model discloses a fire retardant device for an inlet and an outlet of a vacuum pump, belongs to the technical field of protective devices, and aims to provide a fire retardant device capable of effectively preventing the interior of the vacuum pump from combustion impact, the fire retardant device comprises a buffer cylinder, connecting ends are fixed to the two ends of the buffer cylinder, and each connecting end comprises an outer cylinder; the end, opposite to the buffering cylinder, of the outer cylinder is fixedly connected with inner cylinders, the ends, away from each other, of the two inner cylinders are jointly matched with an inner restraining piece, a main body part of the inner restraining piece is a polished shaft, the polished shaft is sleeved with a piston disc located in the buffering cylinder, the piston disc is provided with convection holes, and the ends, away from each other, of the inner cylinders are provided with flow guide holes. And a spring sleeved outside the optical shaft is arranged in each inner cylinder. By arranging the slidable piston disc structure in the buffer cylinder and reasonably designing the flow guide hole, the convection hole and the sealing gasket structure, when combustion occurs in the pipe, the piston disc can rapidly make contact with the sealing gasket to prevent flame and impact force from spreading into the vacuum pump, and the probability of damage to the interior of the vacuum pump is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of protective devices, in particular to a fire barrier device for the inlet and outlet of a vacuum pump. BACKGROUND

[0002] A vacuum pump is used to reduce the pressure of gas in a closed space by physical or chemical methods to form a vacuum environment. However, during the pumping process, deflagration may occur in the pipeline due to the mixing of flammable materials and oxygen. The impact force and high temperature of the deflagration will be transmitted to the vacuum pump through the pipeline, causing damage to the internal structure of the vacuum pump. SUMMARY

[0003] The purpose of the present application is to provide a fire barrier device that can effectively prevent the internal structure of the vacuum pump from being damaged by the impact of combustion.

[0004] To achieve the above purpose, the present application provides a fire barrier device for the inlet and outlet of a vacuum pump: a buffer cylinder is provided, both ends of the buffer cylinder are fixed with connecting ends, the connecting ends include an outer cylinder, one end of the outer cylinder opposite to the buffer cylinder is fixedly connected with an inner cylinder, the ends of the two inner cylinders away from each other are jointly provided with an inner constraint member, the main body part of the inner constraint member is a light shaft, the light shaft is sleeved with a piston disc located in the buffer cylinder, the piston disc is provided with a convection hole, the ends of the inner cylinders away from each other are provided with a flow guide hole, and the end face of the outer cylinder and the inner cylinder located in the buffer cylinder is provided with a sealing gasket, which is suitable for completely shielding the convection hole. One spring is arranged in each inner cylinder and sleeved on the outer light shaft, and the two springs are suitable for abutting against the two ends of the piston disc respectively to provide a reset pressure for the piston disc.

[0005] As a preferred, the central part of the piston disc has a coaxial sliding ring, which is suitable for being sleeved on the outer light shaft to form a sliding pair, and the end part of the spring is sleeved on the outer sliding ring to ensure the stability of the end part of the spring.

[0006] As a preferred, the convection hole has a plurality of convection holes, which are arranged equidistantly around the axis of the sliding ring to ensure the uniformity of the airflow.

[0007] As a preferred, the ends of the two inner cylinders away from each other are provided with a plug-in interface for the light shaft to pass through, the two ends of the light shaft are connected with a limiting pin, the two ends of the light shaft are provided with an internal screw hole, the limiting pin includes a threaded stud, which is suitable for being threadedly connected with the internal screw hole, and the end part of the threaded stud is provided with an end cap, the size of the end cap is larger than the inner diameter of the plug-in interface, and the end cap is located outside the inner cylinder, which effectively inhibits the movement of the light shaft.

[0008] As a preferred, the flow guide hole provided at the end of the inner cylinder has a plurality of flow guide holes, which are arranged equidistantly around the axis of the plug-in interface, which is also for the airflow to pass through uniformly.

[0009] As a preferred, the common end face of the outer cylinder and the inner cylinder located in the buffer cylinder is provided with a clearance slot, and the sealing pad is fixedly connected in the clearance slot, so as to ensure the tightness of the sealing pad and reduce the risk of falling off.

[0010] As a preferred, the two connecting ends are fixedly connected with the buffer cylinder through an outer connecting piece, the outer side of the outer cylinder is provided with a connecting ring, the connecting ring is provided with a plurality of through holes arranged equidistantly around the shaft, the buffer cylinder is provided with a through hole penetrating the two end faces, the number and position of the through hole correspond to the through holes, and the outer connecting piece comprises a bolt and a nut, the bolt is inserted into the through hole from one end and then penetrates out of the through hole from the other end to cooperate with the nut, so that the equipment efficiency can be improved.

[0011] As a preferred, the outer cylinder is further provided with a mounting disc at the end away from the buffer cylinder, which is used for connecting with the inlet and outlet of the vacuum pump or an external pipeline.

[0012] Compared with the prior art, the application has the following beneficial effects:

[0013] (1) By setting the slidable piston disc structure in the buffer cylinder, reasonably designing the flow guide hole and the counterflow hole, and the sealing pad structure, and designing the spring structure to constrain the piston disc, when the vacuum pump works normally, the flame arrestor can normally ventilate, when combustion occurs in the pipe, the piston disc can quickly contact the sealing pad, so as to block the propagation of the flame and impact force to the vacuum pump, thereby reducing the probability of internal damage of the vacuum pump;

[0014] (2) By designing the flame arrestor into a symmetrical structure, no matter which end the combustion occurs, the device can prevent the flame from propagating to the other end, has good bidirectional flame retardant capacity, and the inlet and outlet of the vacuum pump are suitable for installation. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a whole structure perspective view of the flame arrestor for the inlet and outlet of the vacuum pump.

[0016] Figure 2 It is a whole structure perspective view of the flame arrestor for the inlet and outlet of the vacuum pump.

[0017] Figure 3 It is a whole structure perspective view of the flame arrestor for the inlet and outlet of the vacuum pump.

[0018] Figure 4 It is a whole structure perspective view of the flame arrestor for the inlet and outlet of the vacuum pump.

[0019] Figure 5The spring and the inner constraint of the fire barrier device for the inlet and outlet of the vacuum pump are matched.

[0020] Figure 6 The sealing gasket and the connecting end of the fire barrier device for the inlet and outlet of the vacuum pump are matched.

[0021] Figure 7 The connecting end of the fire barrier device for the inlet and outlet of the vacuum pump is matched.

[0022] Figure 8 The buffer cylinder of the fire barrier device for the inlet and outlet of the vacuum pump is matched.

[0023] In the figure: 1, buffer cylinder; 101, through hole; 2, connecting end; 201, outer cylinder; 202, inner cylinder; 203, plug-in interface; 204, flow guide hole; 205, connecting ring; 206, through hole; 207, accommodation groove; 208, mounting disc; 3, outer connecting piece; 301, bolt; 302, nut; 4, inner constraint; 401, optical axis; 420, limiting bolt; 421, stud; 422, end cap; 5, sealing gasket; 6, piston disc; 601, sliding ring; 602, convection hole; 7, spring. DETAILED DESCRIPTION

[0024] Hereinafter, the present application will be further described in conjunction with specific embodiments, and it should be noted that the following described embodiments or technical features can be combined in any manner to form new embodiments without conflict.

[0025] In the description of the present application, it should be noted that for orientation words, such as the terms "center", "transverse", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. The orientation and positional relationship shown in the drawing is based on the orientation or positional relationship shown in the drawing, and is only for the convenience of describing the present application and simplifying the description, and cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as limiting the specific protection scope of the present application.

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0027] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0028] like Figures 1-8 The flame arrestor device shown for the inlet and outlet of the vacuum pump includes a cylindrical buffer cylinder 1. Both ends of the buffer cylinder 1 are fixed with connecting ends 2. The two connecting ends 2 are actually fixedly connected to the buffer cylinder 1 through an external connector 3. The specific structure of the connecting end 2 includes an outer cylinder 201. The outer side of the outer cylinder 201 has a connecting ring 205. The connecting ring 205 has several through holes 206 arranged equidistantly around the axis. The buffer cylinder 1 has through holes 101 that pass through both ends. The number and position of the through holes 101 correspond to the through holes 206. The external connector 3 includes a bolt 301 and a nut 302. The bolt 301 is relatively long and will be inserted into the through hole 206 at one end and then pass out through the through hole 206 at the other end to cooperate with the nut 302 to achieve tightening and fixation.

[0029] The outer cylinder 201 is fixedly connected to one end of the buffer cylinder 1 with a coaxial inner cylinder 202. The two inner cylinders 202 are cooperating with each other at their far ends. The main body of the inner constraint 4 is an optical shaft 401, which is coaxial with the buffer cylinder 1. The two inner cylinders 202 are provided with an insertion interface 203 that passes through the inner and outer end faces for the optical shaft 401 to pass through. The two ends of the optical shaft 401 are connected with limit bolts 420 to suppress the optical shaft 401 from moving relative to the inner cylinder 202. In fact, the two ends of the optical shaft 401 are provided with internal threaded holes. The limit bolts 420 include studs 421 for threaded engagement with the internal threaded holes. The end of the stud 421 has an integral and larger end cap 422. The size of the end cap 422 is larger than the inner diameter of the insertion interface 203 and is located outside the inner cylinder 202. In this way, the two end caps 422 simultaneously restrict the optical shaft 401, which can effectively maintain the stability of the inner constraint 4 in the whole device.

[0030] The optical axis 401 is sleeved with the piston disc 6 located in the buffer cylinder 1, in order to increase the sliding stability of the piston disc 6, the central part of the piston disc 6 is provided with the coaxial sliding ring 601, the sliding ring 601 with larger axial dimension is sleeved outside the optical axis 401 to form a sliding pair, the two ends of the sliding ring 601 protrude from the two end faces of the piston disc 6, the outer side of the piston disc 6 is almost attached to the inner wall of the buffer cylinder 1, so the convection hole 602 needs to be formed on the piston disc 6, so that the air flow passes through, thereby ensuring the normal work of the vacuum pump, the convection hole 602 is several, and is located outside the sliding ring 601, and the convection hole 602 is equidistantly arranged around the axis of the sliding ring 601, so that the air flow passing through the piston disc 6 is more uniform.

[0031] The inner cylinder 202 is provided with the flow guide hole 204 at the end part away from each other, the flow guide hole 204 is not connected with the plug-in interface 203, the inner cylinder 202 is provided with several flow guide holes 204 at the end part, the flow guide holes 204 are equidistantly arranged around the axis of the plug-in interface 203, and the air flow passing through the end part of the inner cylinder 202 is also forced to be more uniform.

[0032] The outer cylinder 201 and the inner cylinder 202 are provided with the sealing gasket 5 made of high-temperature-resistant silica gel at the end face of one end located in the buffer cylinder 1, actually, the common end face of the outer cylinder 201 and the inner cylinder 202 located in the buffer cylinder 1 is also provided with the accommodation groove 207, the sealing gasket 5 is fixedly connected in the accommodation groove 207, and the sealing gasket 5 is used for completely shielding the convection hole 602 and preventing the flame from continuing to spread forward.

[0033] Each inner cylinder 202 is provided with a spring 7 sleeved outside the optical axis 401, the two springs 7 abut against the two ends of the piston disc 6 respectively, and the opposite end parts of the spring 7 are sleeved outside the sliding ring 601, the other end of the spring 7 is constrained by the inner cylinder 202, and both ends can keep good connection and stable relative position, and the outer cylinder 201 is provided with the mounting disc 208 away from the buffer cylinder 1, which is used for being connected with the inlet and outlet of the vacuum pump or external pipelines.

[0034] Working principle: when in use, one of the fire blocking devices is installed at the inlet and outlet of the vacuum pump, one connecting end 2 of each fire blocking device is connected with the vacuum pump, and the other connecting end 2 is connected with the external pipeline, when the open flame is generated in one connecting end 2, the air pressure is sharply increased due to high temperature, air flow is generated to push the piston disc 6 to the direction of the other connecting end 2, until the piston disc 6 is in contact with the sealing gasket 5, the air at the two ends of the piston disc 6 is blocked, the combustion rapidly consumes the air at one end of the piston disc 6, the open flame is extinguished due to lack of oxygen, the air pressure rising caused by the open flame is reduced, and the piston disc 6 is reset under the pushing action of the spring 7, at this time, the temperature has been reduced to below the ignition point, and the flame cannot be generated at the other end of the piston disc 6, thereby the fire blocking effect is realized, and the probability that the explosion in the external pipeline damages the internal part of the vacuum pump is reduced.

[0035] The foregoing describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-described embodiments, and the above-described embodiments and descriptions in the specification are only the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A flame arrestor for the inlet and outlet of a vacuum pump, characterized by: The utility model provides a buffer cylinder (1), both ends of the buffer cylinder (1) are fixed with connecting end (2), the connecting end (2) includes outer cylinder (201), the one end of outer cylinder (201) is fixedly connected with inner cylinder (202) to the buffer cylinder (1), the end of mutual faraway of two inner cylinders (202) is cooperated with inner constraint part (4) together, the main part of inner constraint part (4) is light axle (401), the light axle (401) is sheathed in the piston disc (6) in the buffer cylinder (1), the piston disc (6) is seted up with the convection hole (602), the end of mutual faraway of inner cylinder (202) is seted up with the flow guide hole (204), the outer cylinder (201) and inner cylinder (202) are seted up with sealing pad (5) in the end face in the buffer cylinder (1) together, are adapted to completely shield the convection hole (602), and each inner cylinder (202) is provided with a spring (7) in the outer of light axle (401), and two springs (7) are adapted to respectively resist the both ends of piston disc (6).

2. A flame arrestor for a vacuum pump inlet or outlet as defined in claim 1, characterized in that: The piston disc (6) has a coaxial sliding ring (601) in the center, which is adapted to be sleeved outside the light axle (401) to form a sliding pair, and the end of the spring (7) is sleeved outside the sliding ring (601).

3. A flame arrestor for a vacuum pump inlet or outlet as defined in claim 2, characterized in that: The convection hole (602) has a plurality of convection holes (602) arranged equidistantly around the axis of the sliding ring (601).

4. A flame arrestor for a vacuum pump inlet or outlet as defined in claim 3, characterized in that: The end of mutual faraway of two inner cylinders (202) is seted up with the insertion interface (203) for the light axle (401) to pass through, the both ends of the light axle (401) are connected with the limiting pin (420), the both ends of the light axle (401) are seted up with the internal screw hole, the limiting pin (420) includes a threaded stud (421) adapted to be threadedly connected with the internal screw hole, and the end of the threaded stud (421) has an end cap (422) with a size larger than the inner diameter of the insertion interface (203) and located outside the inner cylinder (202).

5. A flame arrestor for the inlet or outlet of a vacuum pump as claimed in claim 4, characterised in that: The flow guide hole (204) seted up at the end of the inner cylinder (202) has a plurality of flow guide holes (204) arranged equidistantly around the axis of the insertion interface (203).

6. A flame arrestor for a vacuum pump inlet or outlet as defined in claim 5, characterized in that: The outer cylinder (201) and the inner cylinder (202) are seted up with a clearance slot (207) on the common end face in the buffer cylinder (1), and the sealing pad (5) is fixedly connected in the clearance slot (207).

7. A flame arrestor for the inlet or outlet of a vacuum pump according to any one of claims 1 to 6, characterized in that: Two connecting ends (2) are fixedly connected with the buffer cylinder (1) through an outer connecting member (3), the outer side of the outer cylinder (201) has a connecting ring (205) seted up with a plurality of through holes (206) arranged equidistantly around the axis, the buffer cylinder (1) is seted up with a penetrating hole (101) penetrating the both end faces, the number and position of the penetrating hole (101) correspond to the through holes (206), and the outer connecting member (3) includes a bolt (301) and a nut (302), the bolt (301) is inserted into the penetrating hole (101) from one end of the through hole (206) and then passes out from the other end of the through hole (206) to be connected with the nut (302).

8. A flame arrestor for a vacuum pump inlet or outlet as defined in claim 7, characterized in that: The outer cylinder (201) further has a mounting disc (208) away from one end of the buffer cylinder (1).

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