CN113250998A - Centrifugal fan - Google Patents

Centrifugal fan Download PDF

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Publication number
CN113250998A
CN113250998A CN202110687585.9A CN202110687585A CN113250998A CN 113250998 A CN113250998 A CN 113250998A CN 202110687585 A CN202110687585 A CN 202110687585A CN 113250998 A CN113250998 A CN 113250998A
Authority
CN
China
Prior art keywords
positioning
lock pin
groove
cutting groove
annular
Prior art date
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.)
Pending
Application number
CN202110687585.9A
Other languages
Chinese (zh)
Inventor
张海霞
李勇
赵红光
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN202110687585.9A priority Critical patent/CN113250998A/en
Publication of CN113250998A publication Critical patent/CN113250998A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/626—Mounting or removal of fans

Abstract

The invention discloses a centrifugal fan, which comprises a fan body, wherein a cavity is arranged in the fan body, an end cover is fixedly arranged at the right end of the fan body, a rotating shaft is rotationally connected in the end cover, an impeller is fixedly arranged at the left end of the rotating shaft, an air inlet pipe is arranged at the left end of the fan body, an air outlet pipe is arranged at the outer side of the fan body, a pipeline assembly is connected to the air outlet pipe, and the pipeline comprises a flange; an annular cutting groove is formed in the opening of the air outlet pipe, and an annular convex block is arranged on the flange; a first sliding hole and a second sliding hole are arranged on the outer side of the circumference of the air outlet pipe, a positioning hole is radially arranged in the annular convex block, a lock pin is connected in the first sliding hole in a sliding manner, a first spring is arranged in the first sliding hole, and the lock pin is provided with a positioning rod; a positioning assembly connected with the lock pin is arranged in the air outlet pipe; the centrifugal fan is simple in structure and convenient to install and high in efficiency.

Description

Centrifugal fan
Technical Field
The invention relates to the field of fans, in particular to a centrifugal fan convenient to connect.
Background
The centrifugal fan is an element which converts mechanical energy into pressure energy and kinetic energy of gas by utilizing the rotation of a fan impeller, the gas enters the air inlet axially through an air inlet, the gas obtains the pressure energy and the kinetic energy through the rotation action of the impeller, the gas is output along a spiral shell, and then the gas is sent out from an air outlet of the shell. Need be at centrifugal fan air outlet department connecting tube when centrifugal fan's daily use for obtain the gas of kinetic energy and pressure energy and can discharge the fan, and present pipeline and centrifugal fan mostly are in the same place pipeline and fan air outlet department's flange joint through the bolt, and this kind of connected mode is very troublesome, influences the installation effectiveness of fan.
Disclosure of Invention
The invention aims to provide a centrifugal fan which is simple in structure, convenient to install and high in efficiency.
In order to achieve the purpose, the invention provides the following technical scheme: a centrifugal fan comprises a fan body, wherein a cavity with an opening at the right end is arranged in the fan body, an end cover is fixedly arranged at the right end of the fan body, a rotating shaft is connected in the end cover in a rotating mode, the left end of the rotating shaft extends into the cavity and is fixedly provided with an impeller, an air inlet pipe coaxial with the rotating shaft is arranged at the left end of the fan body, an air outlet pipe is arranged on the outer side of the fan body along the radial direction of the impeller, when the centrifugal fan is used, a pipeline assembly is connected to the air outlet pipe, and the pipeline comprises a flange; an annular cutting groove is formed in the opening of the air outlet pipe, and an annular convex block extending into the annular cutting groove is arranged on the flange; a first sliding hole and a second sliding hole are formed in the outer side of the circumference of the air outlet pipe along the radial direction of the annular cutting groove, the first sliding hole is communicated with the second sliding hole of the annular cutting groove, a positioning hole is formed in the annular bump in the radial direction, a lock pin is connected in the first sliding hole in a sliding mode along the radial direction of the annular cutting groove, a first spring used for forcing the lock pin to be separated from the first sliding hole is arranged in the first sliding hole, and a positioning rod extending into the second sliding hole is arranged at one end of the lock pin extending into the first sliding hole; and a positioning assembly connected with the lock pin is arranged in the air outlet pipe.
Furthermore, when the pipeline assembly is connected with the air outlet pipe, an annular convex block on the flange is inserted into the annular cutting groove, the positioning hole and the second sliding hole are positioned at the same axial position, the lock pin is released after being pressed to the first position in the direction close to the annular convex block, the lock pin moves to the locking position in the direction far away from the annular convex block under the action of the first spring, and the positioning rod is inserted into the positioning hole; when the pipeline assembly is disconnected with the air outlet pipe; the lock pin is released after being pressed to the second position in the direction close to the annular bump, the lock pin moves to the unlocking position in the direction far away from the annular bump under the action of the first spring, and the positioning rod is separated from the positioning hole.
Furthermore, the positioning feed assembly comprises a positioning block, a positioning groove communicated with the side wall of the first sliding hole is formed in the air outlet pipe along the radial direction of the first sliding hole, the positioning block is connected in the positioning groove in a sliding manner, a track groove is formed in the outer side of the circumference of the lock pin, and a positioning protrusion extending out of the positioning groove and into the track groove is arranged on the positioning block; a positioning spring for forcing the positioning block to drive the positioning protrusion to extend into the track groove is arranged in the positioning groove; when the lock pin moves axially along the first slide hole; the positioning protrusion moves in the track groove.
Further, the track groove comprises a first cutting groove which is arranged on the outer side of the lock pin and extends from the far end of the lock pin to the near end of the lock pin, a second cutting groove which is communicated with the near end of the first cutting groove and is obliquely arranged towards the far end of the lock pin, a third cutting groove which is communicated with the far end of the second cutting groove and is obliquely arranged towards the near end of the lock pin, and a fourth cutting groove which is communicated with the near end of the third cutting groove and is obliquely arranged towards the far end of the lock pin, wherein the far end of the fourth cutting groove is communicated with the far end of the first cutting groove; a first step is formed between the first cutting groove and the second cutting groove, and the first step is used for preventing the positioning protrusion from sliding into the first cutting groove from the second cutting groove; a second step is formed between the second cutting groove and the third cutting groove, and the second step is arranged for preventing the positioning bulge from sliding into the second cutting groove from the third cutting groove; a third step is formed between the third cutting groove and the fourth cutting groove, and the third step is used for preventing the positioning bulge from sliding into the third cutting groove from the fourth cutting groove; a fourth step is formed between the fourth cutting groove and the first cutting groove, and the fourth step is used for preventing the positioning protrusion from sliding into the fourth cutting groove from the first cutting groove; when the lock pin moves to the first position, the positioning protrusion moves from the first slot to the proximal end of the second slot; when the lock pin moves to the locking position, the positioning protrusion moves from the second notch to the far end of the third notch; the detent projection moves from the third slot to a proximal end of the fourth slot when the lock pin moves to the second position, and moves from the fourth slot to a distal end of the first slot when the lock pin moves to the unlocked position.
Furthermore, the end part of the annular convex block is provided with a sealing convex ring extending into the air outlet pipe, and the outer side of the sealing convex ring is provided with a sealing ring.
Advantageous effects
Compared with the prior art, the technical scheme of the invention has the following advantages:
1. the air outlet pipe is provided with the lock pin which can be pressed and is matched and connected with the positioning hole on the flange of the pipeline assembly, so that the centrifugal fan and the pipeline assembly can be quickly connected and are convenient to connect;
2. by using the lock pin with the track groove, the lock pin can extend out when being pressed down, but can retract when being pressed down again, so that the operation is convenient when the connection is disassembled.
Drawings
FIG. 1 is a cross-sectional view of the centrifugal fan of the present invention after attachment to a flange;
FIG. 2 is a cross-sectional view of a centrifugal fan according to the present invention;
FIG. 3 is a cross-sectional view of a flange of the present invention;
FIG. 4 is a cross-sectional view of the centrifugal fan of the present invention at the air outlet pipe;
FIG. 5 is a cross-sectional view of the junction of the outlet duct of the centrifugal fan after the centrifugal fan is connected to the flange according to the present invention;
figures 6-9 are exterior views of the locking pin of the present invention.
Detailed Description
Referring to fig. 1-9, a centrifugal fan includes a body 1, a chamber 1a with an opening at the right end is arranged in the body 1, an end cover 1c is fixedly arranged at the right end of the body 1, a rotating shaft 300 is rotatably connected in the end cover 1c, the left end of the rotating shaft 300 extends into the chamber 1a and is fixedly provided with an impeller 200, an air inlet pipe 100 coaxial with the rotating shaft 300 is arranged at the left end of the body 1, an air outlet pipe 1b is arranged at the outer side of the body 1 along the radial direction of the impeller 200, when the centrifugal fan is used, a pipeline assembly is connected to the air outlet pipe 1b, and the pipeline includes a flange 5; an annular cutting groove 11 is formed in the opening of the air outlet pipe 1b, and an annular bump 51 extending into the annular cutting groove 11 is arranged on the flange 5; a first sliding hole 13 and a second sliding hole 12 for communicating the first sliding hole 13 with the annular cutting groove 11 are arranged on the outer side of the circumference of the air outlet pipe 1b along the radial direction of the annular cutting groove 11, a positioning hole 5a is arranged in the annular bump 51 along the radial direction, a lock pin 2 is connected in the first sliding hole 13 along the radial direction of the annular cutting groove 11 in a sliding manner, a first spring 14 for forcing the lock pin 2 to be separated from the first sliding hole 13 is arranged in the first sliding hole 13, and a positioning rod 21 extending into the second sliding hole 12 is arranged at one end of the lock pin 2 extending into the first sliding hole 13; and a positioning assembly connected with the lock pin 2 is arranged in the air outlet pipe 1 b. When the pipeline assembly is connected with the air outlet pipe 1b, the annular convex block 51 on the flange 5 is inserted into the annular cutting groove 11, the positioning hole 5a and the second sliding hole 12 are positioned at the same position, the lock pin 2 is released after the lock pin 2 is pressed to the first position in the direction close to the annular convex block 51, the lock pin 2 moves to the locking position in the direction far away from the annular convex block 51 under the action of the first spring 14, and the positioning rod 21 is inserted into the positioning hole 5 a; when the pipeline assembly is disconnected with the air outlet pipe 1 b; after the lock pin 2 is pressed to the direction close to the annular bump 51 to the second position, the lock pin 2 is released, the lock pin 2 moves to the direction far from the annular bump 51 to the unlocking position under the action of the first spring 14, and the positioning rod 21 is separated from the positioning hole 5 a.
The positioning component comprises a positioning block 17, a positioning groove 15 communicated with the side wall of the first sliding hole 13 is arranged in the air outlet pipe 1b along the radial direction of the first sliding hole 13, the positioning block 17 is connected in the positioning groove 15 in a sliding manner, a track groove is arranged on the outer side of the circumference of the lock pin 2, and a positioning bulge 18 extending out of the positioning groove 15 and into the track groove is arranged on the positioning block 17; a positioning spring 16 for forcing a positioning block 17 to drive a positioning projection 18 to extend into the track groove is arranged in the positioning groove 15; when the lock pin 2 moves axially along the first slide hole 13; the positioning boss 18 moves in the track groove.
The track groove comprises a first cutting groove 2a which is arranged outside the lock pin 2 and extends from the far end of the lock pin 2 to the near end of the lock pin 2, a second cutting groove 2b which is communicated with the near end of the first cutting groove 2a and is obliquely arranged towards the far end of the lock pin 2, a third cutting groove 2c which is communicated with the far end of the second cutting groove 2b and is obliquely arranged towards the near end of the lock pin 2, and a fourth cutting groove 2d which is communicated with the near end of the third cutting groove 2c and is obliquely arranged towards the far end of the lock pin 2, wherein the far end of the fourth cutting groove 2d is communicated with the far end of the first cutting groove 2 a; a first step 2a1 is formed between the first slot 2a and the second slot 2b, and the first step 2a1 is provided for preventing the positioning protrusion 18 from sliding into the first slot 2a from the second slot 2 b; a second step 2b1 is formed between the second slot 2b and the third slot 2c, and the second step 2b1 is provided for preventing the positioning protrusion 18 from sliding into the second slot 2b from the third slot 2 c; a third step 2c1 is formed between the third slot 2c and the fourth slot 2d, and the third step 2c1 is provided for preventing the positioning protrusion 18 from sliding into the third slot 2c from the fourth slot 2 d; a fourth step 2d1 is formed between the fourth slot 2d and the first slot 2a, and the fourth step 2d1 is provided for preventing the positioning protrusion 18 from sliding from the first slot 2a into the fourth slot 2 d; when the lock pin 2 moves to the first position, the positioning projection 18 moves from the first slot 2a to the proximal end of the second slot 2 b; when the lock pin 2 moves to the locking position, the positioning projection 18 moves from the second notch 2b to the distal end of the third notch 2 c; when the lock pin 2 moves to the second position, the positioning projection 18 moves from the third notch 2c to the proximal end of the fourth notch 2d, and when the lock pin 2 moves to the unlock position, the positioning projection 18 moves from the fourth notch 2d to the distal end of the first notch 2 a.
In addition, in order to ensure the reliable sealing at the joint of the flange 5 and the air outlet pipe 1b, a sealing convex ring 52 extending into the air outlet pipe 1b is arranged at the end of the annular convex block 51, and a sealing ring 53 is arranged on the outer side of the sealing convex ring 52.
When the centrifugal fan needs to be used, the air outlet pipe 1b of the centrifugal fan needs to be connected with the pipeline assembly, firstly, the annular projection 51 of the flange 5 is inserted into the annular cutting groove 11 of the air outlet pipe 1b, so that the positioning hole 5a and the positioning rod 21 are in a coaxial position, then the lock pin 2 is pushed to the direction close to the annular projection 51 against the first spring 14, so that the positioning protrusion 18 moves along the first cutting groove 2a and gets into the second cutting groove 2b by passing over the first step 2a1, at the moment, the lock pin 2 drives the positioning rod 21 to move to the first position, the positioning rod 21 gets into the positioning hole 5a, the lock pin 2 is released, under the action of the first spring 14, the lock pin 2 moves reversely away from the annular projection 51, the positioning protrusion 18 moves along the second cutting groove 2b under the action of the first step 2a1, gets into the third cutting groove 2c by passing over the second step 2b1 and is positioned at the far end of the third cutting groove 2c, at this time, the locking pin 2 is moved to the locking position as shown in fig. 5, thereby completing the installation of the water pipe.
When the flange 5 needs to be detached, the lock pin 2 needs to be pushed to the direction close to the annular projection 51 again, the positioning protrusion 18 moves along the third slot 2c under the action of the second step 2b1 and gets into the fourth slot 2d beyond the third step 2c1, at this time, the lock pin 2 moves to the second position, the lock pin 2 moves to the right under the action of the first spring 14 after being released, the positioning protrusion 18 moves along the fourth slot 2d under the action of the third step 2c1, gets into the first slot 2a beyond the fourth step 2d1 and is positioned at the far end of the first slot 2a, at this time, the lock pin 2 moves to the unlocking position, and the positioning rod 21 is disengaged from the positioning hole 5a, so that the flange 5 is separated from the air outlet pipe 1b, and the action is completed.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (5)

1. A centrifugal fan comprises a fan body, wherein a cavity with an opening at the right end is arranged in the fan body, an end cover is fixedly arranged at the right end of the fan body, a rotating shaft is connected in the end cover in a rotating manner, the left end of the rotating shaft extends into the cavity and is fixedly provided with an impeller, an air inlet pipe coaxial with the rotating shaft is arranged at the left end of the fan body, and an air outlet pipe is arranged at the outer side of the fan body along the radial direction of the impeller; an annular cutting groove is formed in the opening of the air outlet pipe, and an annular convex block extending into the annular cutting groove is arranged on the flange; a first sliding hole and a second sliding hole are formed in the outer side of the circumference of the air outlet pipe along the radial direction of the annular cutting groove, the first sliding hole is communicated with the second sliding hole of the annular cutting groove, a positioning hole is formed in the annular bump in the radial direction, a lock pin is connected in the first sliding hole in a sliding mode along the radial direction of the annular cutting groove, a first spring used for forcing the lock pin to be separated from the first sliding hole is arranged in the first sliding hole, and a positioning rod extending into the second sliding hole is arranged at one end of the lock pin extending into the first sliding hole; and a positioning assembly connected with the lock pin is arranged in the air outlet pipe.
2. The centrifugal fan according to claim 1, wherein when the duct assembly is connected to the outlet duct, the annular protrusion on the flange is inserted into the annular groove, the positioning hole and the second sliding hole are coaxially positioned, the lock pin is released after being pressed to a first position in a direction close to the annular protrusion, the lock pin moves to a locking position in a direction away from the annular protrusion under the action of the first spring, and the positioning rod is inserted into the positioning hole; when the pipeline assembly is disconnected with the air outlet pipe; the lock pin is released after being pressed to the second position in the direction close to the annular bump, the lock pin moves to the unlocking position in the direction far away from the annular bump under the action of the first spring, and the positioning rod is separated from the positioning hole.
3. The centrifugal fan according to claim 2, wherein the positioning component comprises a positioning block, a positioning groove communicated with the side wall of the first sliding hole is formed in the air outlet pipe along the radial direction of the first sliding hole, the positioning block is connected in the positioning groove in a sliding manner, a track groove is formed in the outer side of the circumference of the lock pin, and a positioning protrusion extending out of the positioning groove and into the track groove is formed in the positioning block; a positioning spring for forcing the positioning block to drive the positioning protrusion to extend into the track groove is arranged in the positioning groove; when the lock pin moves axially along the first slide hole; the positioning protrusion moves in the track groove.
4. The centrifugal fan as claimed in claim 3, wherein the rail groove includes a first groove disposed outside the lock pin and extending from the distal end of the lock pin toward the proximal end of the lock pin, a second groove communicating with the proximal end of the first groove and obliquely disposed toward the distal end of the lock pin, a third groove communicating with the distal end of the second groove and obliquely disposed toward the proximal end of the lock pin, and a fourth groove communicating with the proximal end of the third groove and obliquely disposed toward the distal end of the lock pin, the distal end of the fourth groove communicating with the distal end of the first groove; a first step is formed between the first cutting groove and the second cutting groove, and the first step is used for preventing the positioning protrusion from sliding into the first cutting groove from the second cutting groove; a second step is formed between the second cutting groove and the third cutting groove, and the second step is arranged for preventing the positioning bulge from sliding into the second cutting groove from the third cutting groove; a third step is formed between the third cutting groove and the fourth cutting groove, and the third step is used for preventing the positioning bulge from sliding into the third cutting groove from the fourth cutting groove; a fourth step is formed between the fourth cutting groove and the first cutting groove, and the fourth step is used for preventing the positioning protrusion from sliding into the fourth cutting groove from the first cutting groove; when the lock pin moves to the first position, the positioning protrusion moves from the first slot to the proximal end of the second slot; when the lock pin moves to the locking position, the positioning protrusion moves from the second notch to the far end of the third notch; the detent projection moves from the third slot to a proximal end of the fourth slot when the lock pin moves to the second position, and moves from the fourth slot to a distal end of the first slot when the lock pin moves to the unlocked position.
5. The centrifugal fan according to claim 1, wherein a sealing convex ring extending into the air outlet pipe is arranged at an end of the annular convex block, and a sealing ring is arranged outside the sealing convex ring.
CN202110687585.9A 2021-06-21 2021-06-21 Centrifugal fan Pending CN113250998A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110687585.9A CN113250998A (en) 2021-06-21 2021-06-21 Centrifugal fan

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110687585.9A CN113250998A (en) 2021-06-21 2021-06-21 Centrifugal fan

Publications (1)

Publication Number Publication Date
CN113250998A true CN113250998A (en) 2021-08-13

Family

ID=77189046

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110687585.9A Pending CN113250998A (en) 2021-06-21 2021-06-21 Centrifugal fan

Country Status (1)

Country Link
CN (1) CN113250998A (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202538975U (en) * 2012-03-21 2012-11-21 厦门建霖工业有限公司 Functional water switching structure for pull-out faucet
JP2014145834A (en) * 2013-01-28 2014-08-14 Olympus Corp Illumination device for photography and photographing device
CN210769538U (en) * 2019-09-05 2020-06-16 安陆市盛鑫风机有限公司 Centrifugal fan convenient to connecting tube
CN211039154U (en) * 2019-11-11 2020-07-17 唐山市丰润区新丰镁砂有限公司 Industrial powder hair-dryer
CN212360246U (en) * 2020-05-12 2021-01-15 广西政和伟业消防有限公司 Prevent large-scale centrifugal fan of jam
CN112709752A (en) * 2020-12-31 2021-04-27 深圳开立生物医疗科技股份有限公司 Flexible bolt device and medical equipment
CN112832604A (en) * 2020-12-23 2021-05-25 安徽宜万丰电器有限公司 Opening and closing actuator for automobile oil filling/charging opening cover

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202538975U (en) * 2012-03-21 2012-11-21 厦门建霖工业有限公司 Functional water switching structure for pull-out faucet
JP2014145834A (en) * 2013-01-28 2014-08-14 Olympus Corp Illumination device for photography and photographing device
CN210769538U (en) * 2019-09-05 2020-06-16 安陆市盛鑫风机有限公司 Centrifugal fan convenient to connecting tube
CN211039154U (en) * 2019-11-11 2020-07-17 唐山市丰润区新丰镁砂有限公司 Industrial powder hair-dryer
CN212360246U (en) * 2020-05-12 2021-01-15 广西政和伟业消防有限公司 Prevent large-scale centrifugal fan of jam
CN112832604A (en) * 2020-12-23 2021-05-25 安徽宜万丰电器有限公司 Opening and closing actuator for automobile oil filling/charging opening cover
CN112709752A (en) * 2020-12-31 2021-04-27 深圳开立生物医疗科技股份有限公司 Flexible bolt device and medical equipment

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Application publication date: 20210813

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