Mixed gas filter

Abstract

The utility model discloses a mixed gas filter which comprises a filter cylinder body, and a filter gas inlet unit, a filter gas outlet unit, a reverse blowing gas inlet unit and a reverse blowing gas outlet unit which are arranged on the filter cylinder body, the pressure difference one-way valve is installed on the filter air inlet unit, the spring nozzle is installed on the reverse blowing air inlet unit, and the exhaust fan is installed on the reverse blowing air outlet unit. According to the mixed gas filter provided by the utility model, the exhaust fan is additionally arranged on the reverse blowing exhaust pipe, the spring nozzle is arranged on the reverse blowing air inlet pipe, and the pressure difference one-way valve is arranged on the filter air inlet pipe; therefore, the problems of equipment vibration and filtered gas inlet pipe blockage caused by a large amount of turbulent flow formed by reverse blowing in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to compressed air filter technical field, concretely relates to a mixed gas filter. BACKGROUND

[0002] In chemical enterprises, due to the complex process, many dangerous gases, many chemical reactions and other factors, it is required that the raw gas in each chemical process is pure and free of impurities. Especially when the gas is mixed gas, it is required that there is no dust, oil mist, soil and other impurities in the mixed gas, so when the process gas enters the reaction stage, the impurities need to be removed, and this step needs to be carried out in the mixed gas filter.

[0003] In the existing mixed gas filter technical scheme, the filter is composed of a cylinder, an upper end cover, a lower end cover, a flange, an air inlet, an air outlet, a filter element and the like. The mixed gas enters the cylinder through the air inlet, and flows out from the air outlet after being filtered by the filter element.

[0004] Because there are dust, soil and other impurities in the mixed gas, the filter element will be scaled for a long time, and the filtering effect will be poor. When the filter element is scaled to a certain extent, the filter element needs to be manually removed and cleaned.

[0005] In the existing scheme, the back flushing relies on the high-pressure air impacting the filter screen from bottom to top in the cylinder, so that the impurities attached to the filter screen fall off and enter the back flushing exhaust pipe along with the high-pressure airflow, and are further discharged from the cylinder. However, due to the resistance of the filter screen, the high-pressure air enters the cylinder from the back flushing air inlet pipe located at the lower end of the cylinder, goes upward along with the high-pressure airflow, contacts the lower end surface of the filter screen and encounters resistance, thereby forming a turbulent flow in the cylinder. The turbulent flow brings the following problems: 1) the turbulent flow drives the filter to vibrate, thereby endangering the safety of the equipment and the connected pipeline; 2) the turbulent flow formed in the space above the filter screen in the cylinder drives the impurities falling off from the filter screen to move around randomly, and a large amount of impurities will inevitably be blown to the filter gas inlet pipe of the filter, not only causing the risk of blocking the filter gas inlet pipe, but also greatly reducing the back flushing effect. SUMMARY

[0006] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a mixed gas filter, which solves the problem that the filter in the prior art is easy to form a turbulent flow, thereby causing equipment vibration and filter gas inlet pipe blockage.

[0007] In order to solve the above technical problems, the utility model adopts the following technical scheme: a mixed gas filter, comprising a filter cylinder and a filter inlet unit, a filter exhaust unit, a back flushing air inlet unit and a back flushing exhaust unit installed on the filter cylinder, further comprising a differential pressure check valve installed on the filter inlet unit, a spring nozzle installed on the back flushing air inlet unit and an air extractor installed on the back flushing exhaust unit.

[0008] The utility model discloses further have the following technical features:

[0009] The filter cylinder body includes a cylinder body and upper and lower heads mounted on both ends of the cylinder body.

[0010] The cylinder body is internally mounted with a filter core.

[0011] The filter inlet unit includes a filter inlet pipe mounted on the upper head and a filter inlet valve mounted on the filter inlet pipe, and the pressure differential check valve is mounted on one end of the filter inlet pipe located in the upper head.

[0012] The filter exhaust unit includes a filter exhaust pipe mounted on the lower head and a filter exhaust valve mounted on the filter exhaust pipe.

[0013] The back purge inlet unit includes a back purge inlet pipe mounted on the lower head and a back purge inlet valve mounted on the back purge inlet pipe, and the spring nozzle is mounted on one end of the back purge inlet pipe located in the lower head.

[0014] The back purge exhaust unit includes a back purge exhaust pipe mounted on the upper head and a back purge exhaust valve mounted on the back purge exhaust pipe, and the air extractor is mounted on the back purge exhaust pipe.

[0015] The spring nozzle includes a nozzle body and a nozzle core sleeved in the nozzle body, and a section of the nozzle core protruding from the nozzle body is further connected with a plug through a grid.

[0016] The plug can block or open the nozzle core.

[0017] The nozzle body is mounted on the back purge inlet pipe.

[0018] The pressure differential check valve includes a check valve body and a valve core mounted in the check valve body, and the check valve body is mounted on the filter inlet pipe.

[0019] The valve core can allow gas to enter the filter cylinder body from the filter inlet pipe.

[0020] The upper head and the lower head are connected through flanges.

[0021] The cylinder body is further mounted with a pressure transmitter, and the pressure transmitter is communicated with both ends of the filter core on the cylinder body.

[0022] Compared with the prior art, the utility model has the following technical effects:

[0023] (I) The utility model provides a mixed gas filter, through setting a air draught fan on the back flushing exhaust pipe, setting a spring nozzle on the back flushing air inlet pipe and setting a differential pressure check valve on the filter air inlet pipe, thereby solve the problem of the existing technical scheme that back flushing forms a large amount of turbulence and causes equipment vibration and filter gas air inlet pipe blockage.

[0024] (II) The utility model provides a mixed gas filter, through setting back flushing air inlet pipe and back flushing exhaust pipe on the upper head and lower head, the filter forms filter gas and back flushing double channel.

[0025] The differential pressure transmitter and control system control the valve action on the air inlet channel and the blowing channel, realize the automatic switching of filter gas process and back flushing process.

[0026] In the back flushing process, in order to avoid that the sundries on the filter core are washed into the filter gas air inlet pipe and pollute the gas to be filtered, set the air draught fan on the back flushing exhaust pipe, form the negative pressure in the back flushing exhaust pipe, guide the sundries washed away by back flushing to enter the back flushing exhaust pipe, then discharge the filter, set the spring nozzle on the back flushing air inlet pipe, realize the automatic control of back flushing air inlet, set the differential pressure check valve on the filter gas air inlet pipe, realize the automatic closure and isolation of filter gas air inlet pipe in the back flushing process.

[0027] (II) The utility model provides a mixed gas filter, simple structure, convenient operation, safe and reliable, strong adaptability. SHEET DESCRIPTION

[0028] Figure 1 It is the overall structure schematic diagram of the utility model's mixed gas filter.

[0029] Figure 2 It is the structure schematic diagram of the utility model's spring nozzle.

[0030] Figure 3 It is the structure schematic diagram of the utility model's differential pressure check valve.

[0031] The meaning of each reference numeral in the drawing is as follows:

[0032] 1-filter cylinder, 2-filter air inlet unit, 3-filter exhaust unit, 4-back flushing air inlet unit, 5-back flushing exhaust unit, 6-differential pressure check valve, 7-spring nozzle, 8-air draught fan, 9-pressure transmitter.

[0033] 1-1-cylinder body, 1-2-upper head, 1-3-lower head, 1-4-filter core, 1-5-flange.

[0034] 2-1-filter air inlet pipe, 2-2-filter gas air inlet valve.

[0035] 3-1-filter exhaust pipe, 3-2-filter exhaust valve.

[0036] 4-1-back purge air inlet pipe, 4-2-back purge air inlet valve.

[0037] 5-1-back purge air exhaust pipe, 5-2-back purge air exhaust valve.

[0038] 6-1-check valve body, 6-2-valve core.

[0039] 7-1-nozzle body, 7-2-nozzle core, 7-3-grid 7-3, 7-4-plug.

[0040] The specific content of the utility model is further explained and described in detail in combination with the embodiments. DETAILED DESCRIPTION

[0041] All components in the utility model, if not specially stated, adopt the components known in the prior art.

[0042] The specific embodiments of the utility model are given below, and it should be noted that the utility model is not limited to the following specific embodiments, and any equivalent transformation based on the technical solutions of the present application falls within the protection scope of the utility model.

[0043] Embodiment 1:

[0044] This embodiment gives a kind of mixed gas filter, as shown in Fig. Figure 1 It includes filter cylinder 1 and installs on filter cylinder 1 filter air inlet unit 2, filter exhaust unit 3, back purge air inlet unit 4 and back purge exhaust unit 5, it also includes installation on filter air inlet unit 2 differential pressure check valve 6, installation on back purge air inlet unit 4 spring nozzle 7 and installation on back purge exhaust unit 5 on fan 8.

[0045] The present application solves the problem that a large amount of turbulence is formed in the cylinder in the prior art, which causes equipment vibration and filter air inlet pipe blockage by the following measures:

[0046] 1) a fan 8 is additionally arranged on the back purge air exhaust pipe 5-1, to create a negative pressure zone during back purge process.

[0047] 2) a spring nozzle 7 is arranged on the back purge air inlet pipe 4-1 to realize automatic control of back purge air inlet.

[0048] 3) a differential pressure check valve 6 is arranged on the filter air inlet pipe 2-1 to realize automatic closure and isolation of the filter air inlet pipe 2-1 during back purge process.

[0049] The utility model discloses a filter reverse blowing device, which comprises a filter cylinder body 1, a filter air inlet unit 2, a filter air outlet unit 3, a filter reverse blowing air inlet unit 4 and a filter reverse blowing air outlet unit 5.

[0050] As a preferred embodiment of the present application:

[0051] The filter cylinder body 1 comprises a cylinder body 1-1 and upper and lower heads 1-2 and 1-3 installed at both ends of the cylinder body 1-1.

[0052] The cylinder body 1-1 is internally provided with a filter core 1-4.

[0053] As a preferred embodiment of the present application:

[0054] The filter air inlet unit 2 comprises a filter air inlet pipe 2-1 installed on the upper head 1-2 and a filter air inlet valve 2-2 installed on the filter air inlet pipe 2-1, and the pressure difference one-way valve 6 is installed on one end of the filter air inlet pipe 2-1 located in the upper head 1-2.

[0055] The filter air outlet unit 3 comprises a filter air outlet pipe 3-1 installed on the lower head 1-3 and a filter air outlet valve 3-2 installed on the filter air outlet pipe 3-1.

[0056] The filter reverse blowing air inlet unit 4 comprises a filter reverse blowing air inlet pipe 4-1 installed on the lower head 1-3 and a filter reverse blowing air inlet valve 4-2 installed on the filter reverse blowing air inlet pipe 4-1, and the spring nozzle 7 is installed on one end of the filter reverse blowing air inlet pipe 4-1 located in the lower head 1-3.

[0057] The filter reverse blowing air outlet unit 5 comprises a filter reverse blowing air outlet pipe 5-1 installed on the upper head 1-2 and a filter reverse blowing air outlet valve 5-2 installed on the filter reverse blowing air outlet pipe 5-1, and the air draught fan 8 is installed on the filter reverse blowing air outlet pipe 5-1.

[0058] The filter reverse blowing air inlet pipe 4-1 and the filter reverse blowing air outlet pipe 5-1 are additionally arranged at the upper head 1-2 and the lower head 1-3, so that the filter forms a filter air passage and a filter reverse blowing air passage.

[0059] The filter air inlet valve 2-2 and the filter reverse blowing air inlet valve 4-2 are controlled by the pressure transmitter 9 and the control system, so that the filter air passage and the filter reverse blowing air passage are automatically switched.

[0060] In the back flushing process, in order to avoid the dirt on the filter core being washed into the filter inlet pipe 2-1 to contaminate the gas to be filtered, an air extractor 8 is arranged on the back flushing exhaust pipe 5-1, a negative pressure is formed in the back flushing exhaust pipe 5-1, the dirt washed away by back flushing is guided into the back flushing exhaust pipe 5-1, and then is discharged from the filter.

[0061] The spring nozzle 7 is arranged, automatic control of back flushing gas inlet is realized, and therefore the formation of turbulence is reduced.

[0062] As a preferred embodiment of the present embodiment:

[0063] As shown in Figure 2 The spring nozzle 7 comprises a nozzle body 7-1 and a nozzle core 7-2 sleeved in the nozzle body 7-1, and a section of the nozzle core 7-2 extending out of the nozzle body 7-1 is further connected with a plug 7-4 through a grid 7-3.

[0064] The plug 7-4 can block or open the nozzle core 7-2.

[0065] The nozzle body 7-1 is installed on the back flushing inlet pipe 4-1.

[0066] As a preferred embodiment of the present embodiment:

[0067] As shown in Figure 3 The differential pressure one-way valve 6 comprises a one-way valve body 6-1 and a valve core 6-2 installed in the one-way valve body 6-1, and the one-way valve body 6-1 is installed on the filter inlet pipe 2-1.

[0068] The valve core 6-2 can enable the gas to enter the filter cylinder body 1 from the filter inlet pipe 2-1.

[0069] As a preferred embodiment of the present embodiment:

[0070] The upper end cover 1-2 and the lower end cover 1-3 are connected through the flange 1-5.

[0071] The cylinder body 1-1 is further provided with a pressure transmitter 9, and the pressure transmitter 9 is communicated with both ends of the filter core 1-4 on the cylinder body 1-1.

[0072] The specific working process of the utility model:

[0073] When the device is working normally, the filter inlet valve 2-2 and the filter outlet valve 3-2 are opened, the pressure difference one-way valve 6 is in the open state under the pressure of the filtered gas, the back flushing inlet valve 4-2 and the back flushing outlet valve 5-2 are closed, the grid 7-3 of the spring nozzle 7 is in the closed state under the pressure of the filtered gas, and the mixer filter has only the filter channel opened, in the filter process. The filtered gas enters the filter cylinder 1 from the filter inlet pipe 2-1, filters the impurities through the filter element 1-4, and the clean air is discharged through the filter outlet pipe 3-1, completing the filtration.

[0074] The pressure transmitters 9 connected to the upper end and the lower end of the filter cylinder 1 transmit the pressure difference signals to the control system in real time. When the impurities on the filter element continuously accumulate and the pressure difference signal reaches the set value, the back flushing function is automatically started. The control system controls the filter inlet valve 2-2 and the filter outlet valve 3-2 to be automatically closed, thereby closing the filter channel; the back flushing inlet valve 4-2, the back flushing outlet valve 5-2 and the air extractor 8 are automatically opened, thereby opening the back flushing channel, and realizing the automatic switching of the filter process to the back flushing process.

[0075] The back flushing air enters the filter cylinder 1 from the back flushing inlet pipe 4-1, and performs the back flushing from the lower end to the upper end of the filter element 1-4. The impurities attached to the filter element 1-4 are blown to the upper end cover 1-2. Due to the action of the air extractor 8, a negative pressure is formed in the back flushing outlet pipe 5-1, thereby guiding the impurities to be discharged from the back flushing outlet pipe 5-1 together with the back flushing air, completing the back flushing function, and realizing the automatic cleaning of the filter.

[0076] During the automatic cleaning process, the grid 7-3 of the spring nozzle 7 is lifted up under the pressure of the back flushing air, so that the back flushing air can smoothly enter the filter cylinder 1. The pressure difference one-way valve 6 is automatically closed, avoiding the impurities from entering and blocking the filter inlet pipe 2-1. After a large amount of turbulent flow is formed in the filter cylinder 1, the pressure in the filter cylinder 1 is greater than the pressure in the back flushing inlet pipe 4-1. Under the pressure of the turbulent flow gas, the grid 7-3 of the spring nozzle 7 is lifted back, and the spring nozzle 7 is automatically closed, thereby cutting off the back flushing inlet.

[0077] After the gas in the filter cylinder 1 is discharged from the back flushing outlet pipe 5-1, the turbulent flow is reduced, and the pressure in the filter cylinder 1 is less than the pressure in the back flushing inlet pipe 4-1. Under the pressure of the back flushing inlet, the grid 7-3 of the spring nozzle 7 is lifted up again, and the back flushing air continues to enter, thereby realizing the automatic control of the back flushing inlet and reducing the turbulent flow formed in the filter cylinder 1. After the automatic cleaning is completed, the control system controls the filter inlet valve 2-2 and the filter outlet valve 3-2 to be opened, and the back flushing inlet valve 4-2, the back flushing outlet valve 5-2 and the air extractor 8 to be closed, so as to enter the filter process again.

[0078] The above technical solutions are only preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can think of changes or replacements within the technical range disclosed by the present application without creative labor, which are all covered in the protection scope of the present application.

Claims

1. A mixed gas filter comprising a filter cylinder (1) and a filter intake unit (2), a filter exhaust unit (3), a back purge intake unit (4) and a back purge exhaust unit (5) mounted on the filter cylinder (1), characterized in that, The differential pressure check valve (6) is installed on the filter air inlet unit (2), the spring nozzle (7) is installed on the back flushing air inlet unit (4), and the exhaust fan (8) is installed on the back flushing air outlet unit (5).

2. The mixed gas filter of claim 1, wherein The filter cylinder body (1) comprises a cylinder body (1-1) and upper and lower end covers (1-2 and 1-3) installed on both ends of the cylinder body (1-1). The filter cartridge (1-4) is installed in the cylinder body (1-1).

3. The mixed gas filter of claim 2, wherein The filter air inlet unit (2) comprises a filter air inlet pipe (2-1) installed on the upper end cover (1-2) and a filter air inlet valve (2-2) installed on the filter air inlet pipe (2-1), and the differential pressure check valve (6) is installed on one end of the filter air inlet pipe (2-1) in the upper end cover (1-2). The filter air outlet unit (3) comprises a filter air outlet pipe (3-1) installed on the lower end cover (1-3) and a filter air outlet valve (3-2) installed on the filter air outlet pipe (3-1). The back flushing air inlet unit (4) comprises a back flushing air inlet pipe (4-1) installed on the lower end cover (1-3) and a back flushing air inlet valve (4-2) installed on the back flushing air inlet pipe (4-1), and the spring nozzle (7) is installed on one end of the back flushing air inlet pipe (4-1) in the lower end cover (1-3). The back flushing air outlet unit (5) comprises a back flushing air outlet pipe (5-1) installed on the upper end cover (1-2) and a back flushing air outlet valve (5-2) installed on the back flushing air outlet pipe (5-1), and the exhaust fan (8) is installed on the back flushing air outlet pipe (5-1).

4. The mixed gas filter of claim 3, wherein The spring nozzle (7) comprises a nozzle body (7-1) and a nozzle core (7-2) sleeved in the nozzle body (7-1), and one end of the nozzle core (7-2) extending out of the nozzle body (7-1) is connected with a plug (7-4) through a grid (7-3). The plug (7-4) can block or open the nozzle core (7-2). The nozzle body (7-1) is installed on the back flushing air inlet pipe (4-1).

5. The mixed gas filter of claim 3, wherein The differential pressure check valve (6) comprises a check valve body (6-1) and a valve core (6-2) installed in the check valve body (6-1), and the check valve body (6-1) is installed on the filter air inlet pipe (2-1). The valve core (6-2) can enable the gas to enter the filter cylinder body (1) from the filter air inlet pipe (2-1).

6. The mixed gas filter of claim 2, wherein The upper and lower end covers (1-2 and 1-3) are connected through flanges (1-5). The cylinder body (1-1) is further provided with a pressure transmitter (9) communicating with both ends of the filter cartridge (1-4) in the cylinder body (1-1).

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