CN113653835A - Damping type valve seat of check valve - Google Patents
Damping type valve seat of check valve Download PDFInfo
- Publication number
- CN113653835A CN113653835A CN202110730036.5A CN202110730036A CN113653835A CN 113653835 A CN113653835 A CN 113653835A CN 202110730036 A CN202110730036 A CN 202110730036A CN 113653835 A CN113653835 A CN 113653835A
- Authority
- CN
- China
- Prior art keywords
- disk seat
- seat
- cylindric
- support
- check valve
- 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
Links
- 238000013016 damping Methods 0.000 title abstract description 7
- 238000009434 installation Methods 0.000 claims abstract description 39
- 125000006850 spacer group Chemical group 0.000 claims description 9
- 230000035939 shock Effects 0.000 claims description 8
- 238000000926 separation method Methods 0.000 abstract description 6
- 238000002955 isolation Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Check Valves (AREA)
Abstract
The invention provides a damping valve seat of a check valve, and relates to the field of check valve application. This check valve shock-proof type disk seat, including valve body and cylindric disk seat, valve body bottom fixedly connected with installation pole, the installation pole outside is located to cylindric disk seat cover, a plurality of support side channels have been seted up in the installation pole outside, and is a plurality of support inside the side channel all is equipped with the support horizontal pole, and is a plurality of support the equal fixedly connected with arm-tie of horizontal pole one end, the arm-tie sets up in the cylindric disk seat outside. This check valve shock-proof type disk seat supports the installation pole through supporting the side channel and unsettled inside cylindric disk seat to support and be provided with the separation sleeve between the horizontal pole outside and the installation pole, through separation sleeve separation support horizontal pole and installation pole, avoid supporting the effort on the horizontal pole and directly use on the installation pole, avoid the valve body and support the horizontal pole resonance, guarantee the stability of valve body work, prolong the life of valve body.
Description
Technical Field
The invention relates to a valve seat, in particular to a damping valve seat of a check valve, and belongs to the technical field of check valve application.
Background
The check valve is a valve with a circular valve clack and acts by self weight and medium pressure to block the medium from flowing backwards. It belongs to the automatic valve category, also called check valve, reflux valve or isolation valve. The valve clack motion mode is divided into lifting type and swing type. The lift check valve is similar in structure to the stop valve and only lacks a valve rod that drives the valve flap. The check valve is commonly used as a bottom valve of a water pumping device and can prevent the backflow of water. The check valve and the stop valve are combined for use, and the safety isolation effect can be achieved.
When the check valve is installed and used, need use the disk seat to assist fixedly to installing the check valve at the operating position, guarantee the stability of check valve installation, but current check valve disk seat general structure is comparatively simple, when the disk seat receives outside vibrations striking, can transmit the check valve body with the effort that outside vibrations striking was applyed to the disk seat on high-efficiently, make the check valve receive the effort influence and take place vibrations, influence the work of check valve, can make the junction of check valve and foreign object receive serious damage, can subtract the life of short check valve.
Disclosure of Invention
The present invention is directed to solve the above problems, and an object of the present invention is to provide a damping type valve seat for a check valve, which solves the problems of the prior art that an acting force applied to the valve seat by an external shock impact is efficiently transmitted to a check valve body, the check valve is affected by the acting force to generate a shock, the operation of the check valve is affected, a joint between the check valve and a foreign object is seriously damaged, and the service life of the check valve is shortened.
In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides a check valve shock-proof type disk seat, includes valve body and cylindric disk seat, valve body bottom fixedly connected with installation pole, the installation pole outside is located to cylindric disk seat cover, a plurality of support side ways have been seted up in the installation pole outside, and are a plurality of support inside of side way all is equipped with the support horizontal pole, and is a plurality of support the equal fixedly connected with arm-tie of horizontal pole one end, the arm-tie sets up in the cylindric disk seat outside, cylindric disk seat one side fixedly connected with riser, be provided with the screw rod between riser and the cylindric disk seat, be provided with the backup pad between installation pole bottom and the cylindric disk seat inner chamber bottom.
Preferably, support horizontal pole outside pot head and be equipped with the spacer sleeve, it is a plurality of the spacer sleeve all sets up inside supporting the side channel, the spacer sleeve all sets up to trapezoidal with supporting side channel cross sectional shape, cushions support horizontal pole and cylindric disk seat through the spacer sleeve, reduces the effort that the support horizontal pole received and transmits the valve body on, guarantees the stability of valve body work.
Preferably, the U-shaped groove has all been seted up to cylindric disk seat both sides, arm-tie quantity sets up to four, four the arm-tie sets up respectively in two U-shaped groove inner chamber tops and bottom, two the U-shaped inslot portion all is equipped with the connecting rod, connecting rod fixed connection accomodates the arm-tie through the U-shaped groove between two arm-ties, guarantees the holistic smoothness in the cylindric disk seat outside, reduces the pulling to the cylindric disk seat behind the foreign object string to the arm-tie outside.
Preferably, a plurality of grooves of accomodating have been seted up in the cylindric disk seat outside, the riser sets up in the thread groove inside, the thread groove has all been seted up to riser one side and cylindric disk seat one side, the thread groove is inside to be equipped with the screw rod, screw rod and riser and cylindric disk seat threaded connection, screw rod cross sectional shape sets up to T shape, through setting up the riser in accomodating the inslot portion, guarantees to accomodate the groove and can not form the edges and corners in the cylindric disk seat outside, guarantees the security that the cylindric disk seat used.
Preferably, a plurality of promotion springs of fixedly connected with between arm-tie and the cylindric disk seat, the promotion spring sets up in the U-shaped inslot portion, support the horizontal pole and set up between a plurality of promotion springs, support horizontal pole one end and run through the cylindric disk seat and contact with the cylindric disk seat, promote the arm-tie through promoting the spring, lose the fixed back of screw rod at the arm-tie, promote the spring and can release the arm-tie inside the U-shaped inslot portion, guarantee the convenience of the operation of arm-tie.
Preferably, a plurality of supporting spring of fixedly connected with between backup pad bottom and the cylindric disk seat inner chamber bottom, a plurality of resilient support pole of cylindric disk seat inner chamber bottom fixedly connected with, it is a plurality of resilient support pole cross sectional shape all sets up to the T shape, a plurality of montants of installation pole bottom fixedly connected with, a plurality of circular slots have been seted up at the backup pad top, the montant runs through the circular slot, supports spacingly bottom the installation pole through the backup pad, guarantees that the installation pole is quick puts that the cylindric disk seat is inside fixed, improves the speed of installation pole installation.
Preferably, the T-shaped groove has all been seted up to cylindric disk seat both sides bottom, cylindric disk seat both sides all are equipped with the fixed plate, fixed plate one end extends into T-shaped inslot portion, fixed plate one end fixedly connected with limiting plate, the limiting plate sets up in T-shaped inslot portion, T-shaped inslot portion is provided with the elastic block, the elastic block sets up between limiting plate and cylindric disk seat, and is fixed with the cylindric disk seat through the fixed plate to be provided with the elastic block between fixed plate and the cylindric disk seat, when the fixed plate received vibrations, the cylindric disk seat can not resonate with the fixed plate.
The invention provides a damping valve seat of a check valve, which has the following beneficial effects:
1. this check valve shock-proof type disk seat supports the installation pole through supporting the side channel and unsettled inside cylindric disk seat to support and be provided with the separation sleeve between the horizontal pole outside and the installation pole, through separation sleeve separation support horizontal pole and installation pole, avoid supporting the effort on the horizontal pole and directly use on the installation pole, avoid the valve body and support the horizontal pole resonance, guarantee the stability of valve body work, prolong the life of valve body.
2. This check valve shock-proof type disk seat, after rotatory screw rod, make the arm-tie promoted by the push spring and leave U-shaped inslot portion to the arm-tie removes can stimulate to support the horizontal pole and makes to support the horizontal pole and leave and support the side inslot portion, finally makes to support the horizontal pole and lose the support fixed action to the installation pole, and convenient quick messenger supports the horizontal pole and breaks away from fixedly with the installation pole, guarantees that installation pole and cylindric disk seat break away from fixed efficiency, improves the speed that the staff detected the maintenance valve body.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a partial cross-sectional view of the present invention;
FIG. 3 is a schematic structural view of the pulling plate of the present invention;
fig. 4 is a schematic structural view of the fixing plate of the present invention.
In the figure: 1. a valve body; 2. mounting a rod; 3. a cylindrical valve seat; 4. an elastic block; 5. an elastic support bar; 6. a limiting plate; 7. a support plate; 8. a vertical rod; 9. a support spring; 10. a U-shaped groove; 11. pulling a plate; 12. a receiving groove; 13. a thread groove; 14. a support rail; 15. a push spring; 16. an isolation sleeve; 17. a support side channel; 18. a screw; 19. a connecting rod; 20. a fixing plate; 21. a riser.
Detailed Description
The embodiment of the invention provides a damping valve seat of a check valve.
Referring to fig. 1, 2, 3 and 4, the valve comprises a valve body 1 and a cylindrical valve seat 3, wherein a mounting rod 2 is fixedly connected to the bottom of the valve body 1, the cylindrical valve seat 3 is sleeved outside the mounting rod 2, a plurality of supporting side grooves 17 are formed in the outer side of the mounting rod 2, supporting cross rods 14 are respectively arranged in the supporting side grooves 17, an isolation sleeve 16 is sleeved at one end of the outer side of each supporting cross rod 14, the isolation sleeves 16 are respectively arranged in the supporting side grooves 17, the cross sections of the isolation sleeves 16 and the supporting side grooves 17 are respectively trapezoidal, the supporting cross rods 14 and the cylindrical valve seat 3 are buffered through the isolation sleeves 16, the acting force applied to the supporting cross rods 14 is reduced and transmitted to the valve body 1, the working stability of the valve body 1 is ensured, one ends of the supporting cross rods 14 are respectively and fixedly connected with a pulling plate 11, the pulling plate 11 is arranged outside the cylindrical valve seat 3, one side of the cylindrical valve seat 3 is fixedly connected with a vertical plate 21, a screw 18 is arranged between the vertical plate 21 and the cylindrical valve seat 3, a supporting plate 7 is arranged between the bottom of the mounting rod 2 and the bottom of the inner cavity of the cylindrical valve seat 3.
Specifically, establish 3 covers of cylindric disk seat and establish and fix valve body 1 in the installation pole 2 outsides, and a plurality of support horizontal pole 14 one ends that 3 inside settings of cylindric disk seat all extend into the support side groove 17 inside that the installation pole 2 outsides were seted up, support side groove 17 with installation pole 2 support unsettled inside cylindric disk seat 3, and be provided with spacer 16 between the support horizontal pole 14 outside and the installation pole 2, support horizontal pole 14 and installation pole 2 through spacer 16 isolation support, avoid supporting the effort on the horizontal pole 14 and directly use on the installation pole 2, avoid valve body 1 and support horizontal pole 14 resonance, guarantee the stability of valve body 1 job, prolong the life of valve body 1.
Referring to fig. 1, 2, 3 and 4 again, U-shaped grooves 10 are formed on both sides of the cylindrical valve seat 3, the number of the pulling plates 11 is four, four pulling plates 11 are respectively arranged on the top and the bottom of the inner cavities of the two U-shaped grooves 10, connecting rods 19 are respectively arranged inside the two U-shaped grooves 10, the connecting rods 19 are fixedly connected between the two pulling plates 11, the pulling plates 11 are accommodated in the U-shaped grooves 10, a plurality of pushing springs 15 are fixedly connected between the pulling plates 11 and the cylindrical valve seat 3, the pushing springs 15 are arranged inside the U-shaped grooves 10, supporting cross rods 14 are arranged between the pushing springs 15, one end of each supporting cross rod 14 penetrates through the cylindrical valve seat 3 and is in contact with the cylindrical valve seat 3, the pulling plates 11 are pushed by the pushing springs 15, after the pulling plates 11 lose the fixation of the screws 18, the pushing springs 15 push the pulling plates 11 to push the inside of the U-shaped grooves 10, the convenience of the operation of the pulling plates 11 is ensured, and the overall smoothness of the outer side of the cylindrical valve seat 3 is ensured, reduce the pulling to cylindric disk seat 3 behind foreign object hung 11 outsides of arm-tie, a plurality of grooves 12 of accomodating have been seted up in the 3 outsides of cylindric disk seat, riser 21 sets up inside thread groove 13, thread groove 13 has all been seted up to riser 21 one side and 3 one sides of cylindric disk seat, the inside screw rod 18 that is equipped with of thread groove 13, screw rod 18 and riser 21 and 3 threaded connection of cylindric disk seat, 18 cross sectional shape of screw rod set up to T shape, through set up riser 21 inside accomodating groove 12, guarantee to accomodate groove 12 and can not form the edges and corners in the 3 outsides of cylindric disk seat, guarantee the security that cylindric disk seat 3 used.
Specifically, at the one end fixedly connected with arm-tie 11 of support horizontal pole 14, and a plurality of promotion springs 15 of fixedly connected with between arm-tie 11 and the cylindric disk seat 3, consequently make screw rod 18 leave behind thread groove 13 inside when rotatory screw rod 18, make arm-tie 11 one side fixed connection's riser 21 lose fixedly, arm-tie 11 loses the fixed of riser 21 and can be promoted by promotion spring 15 this moment, make arm-tie 11 leave the U-shaped inslot 10 inside that the cylindric disk seat 3 outside was seted up, and arm-tie 11 removes and can stimulate support horizontal pole 14 and make support horizontal pole 14 leave inside supporting side groove 17, finally make support horizontal pole 14 lose the support fixed action to erection rod 2, convenient quick messenger support horizontal pole 14 breaks away from fixedly with erection rod 2, guarantee that erection rod 2 and cylindric 3 break away from fixed efficiency, improve the speed that the staff detected and maintained valve body 1.
Referring to fig. 1, fig. 2, fig. 3 and fig. 4 again, a plurality of supporting springs 9 are fixedly connected between the bottom of the supporting plate 7 and the bottom of the inner cavity of the cylindrical valve seat 3, a plurality of elastic supporting rods 5 are fixedly connected to the bottom of the inner cavity of the cylindrical valve seat 3, the cross-sectional shapes of the elastic supporting rods 5 are all set to be T-shaped, a plurality of vertical rods 8 are fixedly connected to the bottom of the mounting rod 2, a plurality of circular grooves are formed in the top of the supporting plate 7, the vertical rods 8 penetrate through the circular grooves, the bottom of the mounting rod 2 is supported and limited by the supporting plate 7, the mounting rod 2 is guaranteed to be rapidly placed inside the cylindrical valve seat 3 to be fixed, the mounting speed of the mounting rod 2 is increased, T-shaped grooves are formed in the bottoms of both sides of the cylindrical valve seat 3, fixing plates 20 are respectively arranged on both sides of the cylindrical valve seat 3, one end of each fixing plate 20 extends into the corresponding T-shaped groove, one end of each fixing plate 20 is fixedly connected with a limiting plate 6, the limiting plate 6 is arranged inside the T-shaped groove, the inside elastic block 4 that is provided with of T-shaped inslot, elastic block 4 set up between limiting plate 6 and cylindric valve seat 3, are fixed cylindric valve seat 3 through fixed plate 20 to be provided with elastic block 4 between fixed plate 20 and the cylindric valve seat 3, when fixed plate 20 receives vibrations, cylindric valve seat 3 can not resonate with fixed plate 20.
Specifically, the backup pad 7 and the elastic support rod 5 that set up through 3 inner chamber bottoms of cylindric disk seat support installation pole 2, avoid installation pole 2 to take place to incline at 3 inside removal in-process of cylindric disk seat, guarantee the efficiency of installation pole 2 installation, it is fixed to install cylindric disk seat 3 through fixed plate 20 simultaneously, and be provided with flexible piece 4 between fixed plate 20 and the cylindric disk seat 3, avoid fixed plate 20 and the resonance of cylindric disk seat 3, reduce the probability that cylindric disk seat 3 and valve body 1 vibrate together.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The utility model provides a check valve shock-proof type disk seat, includes valve body (1) and cylindric disk seat (3), valve body (1) bottom fixedly connected with installation pole (2), its characterized in that: installation pole (2) outside is located to cylindric disk seat (3) cover, a plurality of support side ways (17), a plurality of have been seted up in installation pole (2) outside support side ways (17) inside all is equipped with and supports horizontal pole (14), and is a plurality of support the equal fixedly connected with arm-tie (11) of horizontal pole (14) one end, arm-tie (11) set up in cylindric disk seat (3) outside, cylindric disk seat (3) one side fixedly connected with riser (21), be provided with screw rod (18) between riser (21) and cylindric disk seat (3), be provided with backup pad (7) between installation pole (2) bottom and cylindric disk seat (3) inner chamber bottom.
2. The check valve shock absorbing seat according to claim 1, wherein: support horizontal pole (14) outside pot head and be equipped with spacer sleeve (16), it is a plurality of spacer sleeve (16) all set up inside supporting side groove (17), spacer sleeve (16) and supporting side groove (17) cross sectional shape all set up to trapezoidal.
3. The check valve shock absorbing seat according to claim 1, wherein: u-shaped groove (10) have all been seted up to cylindric disk seat (3) both sides, arm-tie (11) quantity sets up to four, four arm-tie (11) set up respectively in two U-shaped groove (10) inner chamber tops and bottom, two U-shaped groove (10) inside all is equipped with connecting rod (19), connecting rod (19) fixed connection is between two arm-ties (11).
4. The check valve shock absorbing seat according to claim 1, wherein: a plurality of grooves (12) of accomodating have been seted up in cylindric disk seat (3) outside, riser (21) set up inside thread groove (13), thread groove (13) have all been seted up to riser (21) one side and cylindric disk seat (3) one side, thread groove (13) inside is equipped with screw rod (18), screw rod (18) and riser (21) and cylindric disk seat (3) threaded connection, screw rod (18) cross sectional shape sets up to the T shape.
5. A check valve shock absorbing seat as claimed in claim 3, wherein: a plurality of pushing springs (15) are fixedly connected between the pulling plate (11) and the cylindrical valve seat (3), the pushing springs (15) are arranged inside the U-shaped groove (10), the supporting cross rod (14) is arranged among the pushing springs (15), and one end of the supporting cross rod (14) penetrates through the cylindrical valve seat (3) and is in contact with the cylindrical valve seat (3).
6. The check valve shock absorbing seat according to claim 1, wherein: a plurality of supporting spring (9) of fixedly connected with between backup pad (7) bottom and cylindric disk seat (3) inner chamber bottom, a plurality of elastic support pole (5) of cylindric disk seat (3) inner chamber bottom fixedly connected with, it is a plurality of elastic support pole (5) cross sectional shape all sets up to T shape, a plurality of montants (8) of installation pole (2) bottom fixedly connected with, a plurality of circular slots have been seted up at backup pad (7) top, montant (8) run through the circular slot.
7. The check valve shock absorbing seat according to claim 1, wherein: t-shaped grooves are all formed in bottom of two sides of the cylindrical valve seat (3), fixing plates (20) are arranged on two sides of the cylindrical valve seat (3), one ends of the fixing plates (20) extend into the T-shaped grooves, limiting plates (6) are fixedly connected to one ends of the fixing plates (20), the limiting plates (6) are arranged in the T-shaped grooves, elastic blocks (4) are arranged in the T-shaped grooves, and the elastic blocks (4) are arranged between the limiting plates (6) and the cylindrical valve seat (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110730036.5A CN113653835A (en) | 2021-06-29 | 2021-06-29 | Damping type valve seat of check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110730036.5A CN113653835A (en) | 2021-06-29 | 2021-06-29 | Damping type valve seat of check valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113653835A true CN113653835A (en) | 2021-11-16 |
Family
ID=78489194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110730036.5A Pending CN113653835A (en) | 2021-06-29 | 2021-06-29 | Damping type valve seat of check valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113653835A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115839431A (en) * | 2023-02-20 | 2023-03-24 | 山东食益食品有限公司 | Control valve for controlling the output of food additives |
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| CN107143602A (en) * | 2017-04-13 | 2017-09-08 | 安徽奥泰粉末冶金有限公司 | A kind of automobile damping valve seat |
| CN109347237A (en) * | 2018-11-02 | 2019-02-15 | 嘉兴学院 | A kind of motor with fixed defencive function |
| CN110198098A (en) * | 2019-05-31 | 2019-09-03 | 芜湖乐知智能科技有限公司 | A kind of mute motor with inner casing cooling function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115839431B (en) * | 2023-02-20 | 2023-05-23 | 山东食益食品有限公司 | Control valve for controlling the output of food additives |
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