CN102606519B - Boric acid recirculation pump - Google Patents
Boric acid recirculation pump Download PDFInfo
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- CN102606519B CN102606519B CN 201210083375 CN201210083375A CN102606519B CN 102606519 B CN102606519 B CN 102606519B CN 201210083375 CN201210083375 CN 201210083375 CN 201210083375 A CN201210083375 A CN 201210083375A CN 102606519 B CN102606519 B CN 102606519B
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Abstract
The invention discloses a boric acid recirculation pump, belonging to the field of the nuclear power equipment. The boric acid recirculation pump comprises a pump shaft, a pump body, an impeller, a pump cover and an air cooling bearing body; the impeller, the pump cover and the air cooling bearing body are sequentially sleeved along the axial direction of the pump shaft; the pump body, the pump cover and the air cooling bearing body are axially fixed; the impeller is embedded in a volute chamber; a mechanical seal and a bearing body are sequentially arranged along the axial direction of the pump shaft between the air cooling bearing body and the pump shaft in the radial direction; a shaft sleeve is arranged between the pump cover and the pump shaft and between the mechanical seal and the pump shaft in the radial direction; a mechanical seal chamber is formed among the pump cover, the shaft sleeve and the mechanical seal; the mechanical seal comprises a movable ring seat and a mechanical seal cover; the movable ring seat is fixed with the pump shaft and the shaft sleeves in the radial direction; the mechanical seal cover is fixed with the pump cover in the axial direction; a movable ring is fixed on the movable ring seat in the radial direction; a static ring is fixed on the mechanical seal cover in the radial direction; a spring is arranged between the static ring and the mechanical seal cover in the axial direction in order to enable the movable ring and the static ring to be in contact with each other in the radial direction and to act on each other.
Description
Technical field
The present invention relates to a kind of boric acid recirculating pump for nuclear power equipment field.
Background technique
The boric acid recirculating pump is a kind of recirculating pump that often uses in the nuclear power station, the effect of boric acid recirculating pump is: at the nuclear power station run duration, for preventing that boric acid from injecting the boric acid crystallization in the case, by the boric acid recirculating pump, the BAS that boric acid is injected in the case continuously circulates, and guarantees BAS concentration and temperature constant.The another one effect of this pump is to finish the first topping up that boric acid injects case.
There is following point in the boric acid recirculating pump of prior art pump: because the BAS temperature is higher, and more than 80 ℃, the non-homogeneous expansion of the pump housing and described air cooling bearing support; When the sealing section in the mechanical seal chamber being washed cooling, the sealing section can lose efficacy because of the crystallization of boric acid and corrosive action, the boundary dimension of boric acid recirculating pump can't be effectively controlled in addition, and causes it to exceed the maximum value that nuclear power plant system allows.
Summary of the invention
The objective of the invention is in order to overcome the deficiencies in the prior art, provide a kind of boric acid that can effectively prevent at the boric acid recirculating pump of mechanical seal chamber intercrystalline, prevent that effectively boric acid from following the mechanical seal inefficacy of pump again, and the safe operation that jeopardizes described boric acid recirculating pump.
A kind of technological scheme that realizes above-mentioned purpose is: a kind of boric acid recirculating pump, comprise pump shaft, the pump housing, and along described pump shaft axial successively impeller, pump cover and the air cooling bearing support of socket, and the described pump housing, pump cover and described air cooling bearing support are axial restraints;
The described pump housing is divided into suction chamber and spiral case chamber, and described suction chamber one end arranges outlet(discharge) flange, and an other end axially is connected with described spiral case chamber by joint; On the outer wall of described spiral case chamber outer pipe is set, the end of described outer pipe arranges outlet(discharge) flange;
Described impeller is built in the described spiral case chamber, the front end of described impeller and the socket of described joint, and described impeller rear end is socketed in the anti-drive end of described pump shaft;
Between described air cooling bearing support and the described pump shaft, along described pump shaft axially set gradually mechanical seal and bearing support, the axial two ends of described bearing support arrange respectively bearing, form the oil storage chamber between these two described bearings;
The oil sealing system is arranged respectively in the axial both sides of described bearing support, and these two described oil sealing systems are that mirror image is arranged symmetrically with, and forms respectively the loop oil pocket between these two described oil sealing systems and the described bearing support;
Described pump cover and described mechanical seal and described pump shaft radially between axle sleeve is set; Described pump cover forms the mechanical seal chamber between described axle sleeve and the described mechanical seal;
Described mechanical seal, comprise rotating seat, machine capping, rotating ring and stationary ring, described rotating seat and described pump shaft and described axle sleeve are radially fixing, described machine capping and described pump cover axial restraint, described rotating ring radially is fixed on the described rotating seat, and described stationary ring radially is fixed in the described machine capping; Between described stationary ring and the described machine capping spring is set, described rotating ring is axially contacted and mutually stressed with described stationary ring.
Further, described spring places in the second latch, arranges in the described machine capping and radially connects fluid through-hole.
Further, described suction chamber is the straight-tapered suction chamber, and described suction chamber arranges the section area of described outlet(discharge) flange one end greater than the section area of described joint one end.
Further, described spiral case chamber is single volute type spiral case chamber, and described outlet pipe is arranged at the top of described spiral case chamber; Between the front end of described impeller and the described joint front seal ring is set, between the rear end of described impeller and the described pump cover increasing back sealing ring is set, between described impeller and the described pump shaft impeller nut is set.
Further, on the described pump cover axial hole is set, is communicated with described spiral case chamber and described mechanical seal chamber.
Further, described oil sealing system comprises oil baffle disc, bearing cap and dust pan, and described oil baffle disc and described dust pan be successively socket on described pump shaft, and described dust pan and described pump shaft are radially fixed; Described dust pan comprises dish axle and dish seat, and described bearing cap is socketed on the outer wall of dish axle of described dust pan, and with described air cooling bearing support axial restraint; The center of described bearing cap arranges boss, on the circumference of described boss end face flange is set, and the limit cover is set on the circumference of described oil baffle disc, makes and forms the oil circuit collection cavity between described oil baffle disc, described bearing cap and the described dust pan.
Further, O-ring seals is set at described pump shaft and described dust pan between radially, described bearing cap and described dust pan radially between, along described bearing cap oil seal structure is set axially.
Further, described air cooling bearing support and described pump cover axially between fastening screw is set.
Further, the sidewall of described axle sleeve arranges hierarchic structure, makes the section area of close described pump cover one end of described axle sleeve greater than the section area of described axle sleeve near described mechanical seal one end.
Further, the bottom of described air cooling bearing support arranges the bearings pin, and the bottom of described spiral case chamber arranges the pump pin.
Adopted the technological scheme of a kind of boric acid recirculating pump of the present invention, namely described boric acid follow again spring in the mechanical seal of pump be arranged on described stationary ring and machine capping axially between.Its technique effect is: in the process of boric acid recirculating pump operation, spring can not damage because being subject to alternating stress, thereby causes the inefficacy of described mechanical seal, and affects the safe operation of described boric acid recirculating pump.
Description of drawings
Fig. 1 is the structural representation of a kind of boric acid recirculating pump of the present invention;
Fig. 2 is the enlarged diagram of the A part of a kind of boric acid recirculating pump of the present invention.
Fig. 3 is the structural representation of the mechanical seal of a kind of boric acid recirculating pump of the present invention.
Embodiment
To see also Fig. 1 to Fig. 3, in order understanding technological scheme of the present invention better, below by embodiment particularly, and to be described in detail by reference to the accompanying drawings:
See also Fig. 1, a kind of boric acid recirculating pump of the present invention comprises pump shaft 100, the pump housing 1, and along described pump shaft 100 axial successively impeller 2, pump cover 3 and the air cooling bearing suppories 5 of socket, and be axial restraint between the described pump housing 1, pump cover 3 and the described air cooling bearing support 5.
In the present embodiment, described pump cover 3 and described air cooling bearing support 5 is provided with fastening screw 32 between axially, the purpose of design is like this: guarantee the conformity that described pump cover 3 and described air cooling bearing support 5 expand, prevent at described boric acid recirculating pump when the transmission temperature surpasses 80 ℃ BAS, because the expansion of described pump cover 3 and described air cooling bearing support 5 is inconsistent, affects the safe operation of described boric acid recirculating pump.
In the present embodiment, the axial restraint between described pump cover 3 and the described air cooling bearing support 5 is finished by screw, between described pump cover 3 and the described pump housing 1 also is to adopt screw fixing.In order to strengthen fixing between the described pump housing 1 and the described pump cover 3, the described pump housing 1 and described pump cover 3 are provided with pad between axially.
Between described air cooling bearing support 5 and described pump shaft 100, axially be socketed successively mechanical seal 6 and bearing support 50 along described pump shaft 100, described bearing support 50 axial two ends arrange respectively clutch shaft bearing and the second bearing, form oil storage chamber 55 between described clutch shaft bearing and described the second bearing.
In the present embodiment, described clutch shaft bearing is positioned at the anti-drive end of described bearing support 50, and namely the left end of bearing support described in Fig. 1 50 is roller bearings; Described the second bearing is positioned at the drive end of described bearing support 50, and namely the right-hand member of bearing support described in Fig. 1 50 is the pair of horns contact ball bearing.The purpose of design is like this: described pump shaft 100 axial forces are born by angular contact ball bearing, and radial force is born by roller bearing.
Described pump cover 3 and described mechanical seal 6 and described pump shaft 100 radially between axle sleeve 101 is set, described pump cover 3, described axle sleeve 101 and described mechanical seal 6 surround mechanical seal chamber 61.
The described pump housing 1 is divided into suction chamber 11 and spiral case chamber 12, and described suction chamber 11 1 ends arrange outlet(discharge) flange 111, and an other end axially is connected with described spiral case chamber 121 by joint 112; On the outer wall of described spiral case chamber 12 outer pipe 121 is set, the end of described outer pipe 121 arranges outlet(discharge) flange 122.
In the present embodiment, described suction chamber 11 is the straight-tapered suction chamber, and described suction chamber 11 arranges the section area of described outlet(discharge) flange 112 1 ends greater than the section area of described joint 112 1 ends.Described spiral case chamber 12 is single volute type spiral case chambers, and described outlet pipe 121 is arranged at the top of described spiral case chamber 12.
Described impeller 2 is built in the described spiral case chamber 12, the front end of described impeller 2 and 112 sockets of described joint.The rear end of described impeller 2 is socketed in the anti-drive end of described pump shaft 100.Front end described here refers to arrange on the described impeller 2 end of impeller inlet 21.The medium that the boric acid recirculating pump transmits is through described suction chamber 11, flows into described impeller 22 from described impeller inlet 21, and the impeller outlet 25 from the circumference of described impeller 2 flows out again.Form pumping chamber between the inwall of the circumference of described impeller 2 and described spiral case chamber 12 and the pump cover 3.
In the present embodiment, in order to improve the efficient of described boric acid recirculating pump, described impeller 2 is enclosed impeller.
Described suction chamber is that the reason of taper suction chamber is: water in described suction chamber 11 from described suction flange 111 to described joint 112 flow in, the flow velocity of water slows down gradually, therefore the hydraulic loss of BAS in described suction chamber 11 is little, and then guarantee that BAS flows into described impeller inlet 21 with uniform flow velocity, like this can Effective Raise the boric acid recirculating pump efficient and anti-cavitation performance.
Described spiral case chamber 12 adopts the purpose of single volute type pumping chamber to be: the section area that helps to reduce described outlet pipe 121 ends, reduce the bore of described outlet(discharge) flange 122, reduce BAS at the flow velocity of described outer pipe 122 tail ends, reduce BAS at the local resistance loss of described outer pipe 121 tail ends, improve the efficient of boric acid recirculating pump, avoid the adapted motor of described boric acid recirculating pump to be burned.
Described outlet pipe 121 is perpendicular to the reason that the level ground arranges on 12 tops, described spiral case chamber: reduce the axial dimension of described boric acid recirculating pump, prevent that the boundary dimension of described boric acid recirculating pump from surpassing the maximum value that nuclear power plant system allows.
Because described spiral case chamber 12 is single volute type spiral case chambers, in order to make described impeller 2 have stable rotating center, between the described joint 112 of the front end of described impeller 2 front seal ring 22 is set, between the rear end of described impeller 2 and the described pump cover 3 increasing back sealing ring 23 is set, between described impeller 2 and the described pump shaft 100 impeller nut 24 is set.Simultaneously, rotate with described pump shaft 4 synchronously in order to guarantee described axle sleeve 101 and described impeller 2, described axle sleeve 101 and described impeller 2 axially between also increased pad.
Therefore in the present embodiment, for the pump housing that prevents described boric acid recirculating pump is corroded, the described pump housing 1 is made by nichrome.
Among the present invention, the structure of described axle sleeve 101 has been done improvement: the outer wall of described axle sleeve 101 arranges hierarchic structure, described axle sleeve 101 is: when guaranteeing described mechanical seal chamber 61 sizes near the section area of the described pump cover one ends purpose greater than described axle sleeve 101, reduce the size of described pump cover 3, described air cooling bearing support 5 and described mechanical seal 6, guarantee that the boundary dimension of described boric acid recirculating pump is in the scope that nuclear power plant system allows.In addition on the one hand, also can prevent from occuring between described axle sleeve 101 and the described mechanical seal 6 size interferes.
See also Fig. 3, in the present embodiment, described mechanical seal 6 is integrated mechanical sealing, comprise rotating seat 62, machine capping 63, rotating ring 64 and stationary ring 65, described rotating seat 62 is radially fixing by O-ring seals and described pump shaft 100 and described axle sleeve 101, described machine capping 63 with by described pump cover 3 axial restraints of bolt, described rotating ring 64 radially is fixed on the described rotating seat 62, described stationary ring 65 radially is fixed in the described machine capping 63.Described rotating ring 64 axially contacts with described stationary ring 65 and is mutually stressed.Surface of contact between described rotating ring 64 and the described stationary ring 65 is the seal face of described mechanical seal 6.Described rotating seat 62 and described rotating ring 64 arranges the first latch 66 along the circumference of described rotating ring between axially, and the circumference along described stationary ring between described machine capping 63 and described stationary ring 65 are axial arranges the second latch 67, described the second latch 67 built-in springs 68.
The purpose of design is like this: described spring 68 can not produce alternating stress in the process of boric acid recirculating pump operation, therefore after the long-time use of described boric acid recirculating pump, described spring 68 can not lose efficacy yet, thereby guarantees the validity of described mechanical seal 6.And described spring 68 is placed in described the second latch 67, its purpose is to prevent that BAS from producing corrosive action to described spring 68.
In described mechanical seal 6, described machine capping 63 and described rotating seat 62 axially between, described stationary ring 63 and described pump cover 3 axially between, described rotating seat 62 and axle sleeve 101 radially between, described machine capping 63 and described stationary ring 65 all arrange O-ring seals between radially, these described O-ring seals are all made by ethylene propylene diene rubber, and ethylene propylene diene rubber can be aging for a long time under radiation condition, thereby prevent described mechanical seal 6 inefficacies.
In addition, in described machine capping 63, also be provided with and radially connect fluid through-hole 69, the described lower end that radially connects fluid through-hole 69 connects described mechanical seal chamber 61, the described effect that radially connects fluid through-hole 69 is to receive the BAS that described mechanical seal chamber 61 leaks out on the one hand, to pass into saturated vapour to described mechanical seal chamber 61 on the one hand in addition, thereby prevent BAS at described mechanical seal chamber 61 intercrystallines, thereby cause mechanical seal to be lost efficacy.
On the described pump cover 3 axial hole 21 is set, be communicated with described mechanical seal chamber 61, the purpose of design is like this: the BAS of directly the boric acid recirculating pump being carried is introduced described mechanical seal chamber 61, and the seal face of described mechanical seal 6 is washed and cools off.Owing to do not need exterior line, when simplifying the bearing support mounting structure, on the other hand, guaranteed that also the BAS that enters described mechanical seal chamber 61 can keep original temperature, thereby prevented that described BAS is at described mechanical seal chamber 61 intercrystallines.
After the entry into service of boric acid recirculating pump, lubricant oil in the described oil storage chamber 55 is through after being arranged at the effect of the disc 102 on the described pump shaft 100, get rid of respectively the described clutch shaft bearing in both sides and described the second bearing on the described bearing support 50, described clutch shaft bearing and described the second bearing are lubricated, after described clutch shaft bearing and described the second bearing are lubricated, lubricant oil flows back to described oil storage chamber 55 through described loop oil pocket 40.
In described oil storage chamber 55, also be provided with oil ga(u)ge 56 and permanent position lubricating cup 57, in order to monitor the variation of described oil storage chamber 55 interior lubricant oil reserves.
The effect of described oil sealing system 4 is to prevent that oil leak from arriving the outside of described boric acid recirculating pump.See also Fig. 2, in the present embodiment, described oil sealing system 4 comprises oil baffle disc 41, bearing cap 42 and dust pan 43, and described oil baffle disc 41 and described dust pan 43 are socketed on the described pump shaft 100 successively; Described dust pan 43 is radially fixing by bolt and described pump shaft 100.Described dust pan 43 comprises dish axle and dish seat, described bearing cap 42 is socketed on the outer wall of dish axle of described dust pan 43, and by air relief cock 48 and described air cooling bearing support 5 axial restraints, the center of described bearing cap 42 end faces arranges boss, and flange 421 is set on the circumference of described boss end face; Limit cover 411 is set on the circumference of described oil baffle disc 41; Form oil circuit collection cavity 44 between described oil baffle disc 41, described bearing cap 42 and the described dust pan 43.
The purpose of design is like this: the lubricant oil that is splashed on the described oil baffle disc 41 by described disc 102 can be introduced into described oil circuit collection cavity 44, passes back into described loop oil pocket 40 again, finally returns described oil storage chamber 55.
In the present embodiment, also be provided with chamfering 412 on the circumference of described oil baffle disc 41, described chamfering 412 is to form in the process by turning and the described limit of Bending Processing cover 411.
In the present embodiment, described oil sealing system 4 also comprises and is arranged on described pump shaft 100 and described dust pan 43 O-ring seals 45 between radially; And described bearing cap 42 and described dust pan 43 radially between, along the oil seal structures 46 that described bearing cap 42 axially arranges, in the present embodiment, described oil seal structure 46 belongs to mazy type mechanical seal.
The effect of described O-ring seals 45 is: prevent lubricant oil from leakage between described dust pan 43 and the described pump shaft 100, and when preventing from again adopting the outside framework oil seal structure simultaneously, the seize phenomenon that causes owing to spring pressure is excessive.The effect of described oil seal structure 46 is: prevent that lubricant oil is from leaking between described dust pan 43 and the described bearing cap 42.
The bottom surface of described bearing cap 42 and described dust pan 43 axially between, annular oil seal structure 47 is set, this annular oil seal structure 47 is by being arranged at the circular groove 422 on described bearing cap 42 bottom surfaces and being arranged at that annular boss 431 on the dish seat end face of described dust pan 43 forms, they on the one hand can be with described bearing cap 42 axial restraints, can also prevent on the one hand in addition lubricant oil from leaking between described bearing cap 42 and the described dust pan 43, can also prevent that dust from entering described oil sealing system 4.
Described clutch shaft bearing on described bearing support 50 and described the second bearing all arrange bearing interstage sleeve 58 to the one side of described oil storage chamber 55; The purpose that described bearing interstage sleeve 58 is set is: with described the second bearing axial restraint in described clutch shaft bearing river.
In addition, increase vent rib 54 on the outer wall of described air cooling bearing support 5, long-pending with the outer wall surface that increases described air cooling bearing support 5, when guaranteeing described air cooling bearing support 5 heat dispersions, make the structure of described air cooling bearing support 5 more simple.A screw 59 is arranged at described air cooling bearing support 5 tops.
The bottom of described air cooling bearing support 5 arranges bearing support and supports 53, and described bearing support support 53 is fixing by screw and described air cooling bearing support 5.The bottom of described spiral case chamber 12 arranges pump pin 13, and described pump pin 13 is cast as one with described spiral case chamber 12.Described pump pin 13 and described bearing support support the described boric acid recirculating pump of 53 common supports.So greatly simplify the supporting frame of boric acid recirculating pump, reduced the boundary dimension of described boric acid recirculating pump.
In addition, above described pump pin 13, also be provided with a pipe plug 14 on the outer wall of described spiral case chamber 12, be used for when the boric acid recirculating pump overhauls the BAS in the spiral case chamber 12 is emptying.
A kind of boric acid recirculating pump in the present embodiment, by above-mentioned technological means, solved the inconsistent problem that expands between the boric acid recirculating pump pump housing 1 and the air cooling bearing support 5, solved BAS easily causes mechanical seal to be lost efficacy in 61 crystallizations of mechanical seal chamber problem, the problem that oil sealing system 4 interior lubricant oil easily leak, reduced simultaneously the boundary dimension of described boric acid recirculating pump, made it meet nuclear power plant system for the requirement of boric acid recirculating pump boundary dimension.
Those of ordinary skill in the art will be appreciated that, above embodiment illustrates the present invention, and be not as limitation of the invention, as long as in connotation scope of the present invention, all will drop in claims scope of the present invention the above embodiment's variation, modification.
Claims (8)
1. boric acid recirculating pump, comprise pump shaft (100), the pump housing (1), and along described pump shaft (100) axial successively impeller (2), pump cover (3) and the air cooling bearing support (5) of socket, and the described pump housing (1), pump cover (3) and described air cooling bearing support (5) are axial restraints;
The described pump housing (1) is divided into suction chamber (11) and spiral case chamber (12), and described suction chamber (11) one ends arrange suction flange (111), and an other end axially is connected with described spiral case chamber (12) by joint (112); Outer pipe (121) is set on the outer wall of described spiral case chamber (12), and the end of described outer pipe (121) arranges outlet(discharge) flange (122);
Described impeller (2) is built in the described spiral case chamber (12), the front end of described impeller (2) and described joint (112) socket, and described impeller (2) rear end is socketed in the anti-drive end of described pump shaft (100);
Between described air cooling bearing support (5) and the described pump shaft (100), axially set gradually mechanical seal (6) and bearing support (50) along described pump shaft (100), described bearing support (50) axially arranges respectively clutch shaft bearing and the second bearing in two ends, forms oil storage chamber (55) between described clutch shaft bearing and described the second bearing;
Oil sealing system (4) is arranged respectively in the axial both sides of described bearing support (50), and these two described oil sealing systems (4) are that mirror image is arranged symmetrically with, and forms respectively loop oil pocket (40) between these two described oil sealing systems (4) and the described bearing support (50);
Described pump cover (3) and described mechanical seal (6) and described pump shaft (100) radially between axle sleeve (101) is set; Described pump cover (3) forms mechanical seal chamber (61) between described axle sleeve (101) and the described mechanical seal (6); It is characterized in that:
Described oil sealing system (4) comprises oil baffle disc (41), bearing cap (42) and dust pan (43), described oil baffle disc (41) and described dust pan (43) be successively socket on described pump shaft (100), and described dust pan (43) is radially fixing with described pump shaft (100); Described dust pan (43) comprises dish axle and dish seat, and described bearing cap (42) is socketed on the outer wall of dish axle of described dust pan (43), and with described air cooling bearing support (5) axial restraint; The center of described bearing cap (42) arranges boss, flange (421) is set on the circumference of described boss end face, limit cover (411) is set on the circumference of described oil baffle disc (41), forms oil circuit collection cavity (44) between described oil baffle disc (41), described bearing cap (42) and the described dust pan (43);
Described mechanical seal (6), comprise rotating seat (62), machine capping (63), rotating ring (64) and stationary ring (65), described rotating seat (62) is radially fixing with described pump shaft (100), described axle sleeve (101), described machine capping (63) and described pump cover (3) axial restraint, described rotating ring (64) radially is fixed on the described rotating seat (62), and described stationary ring (65) radially is fixed in the described machine capping (63); Circumference along described rotating ring (64) between described rotating seat (62) and described rotating ring (64) are axial arranges the first latch (66), circumference along described stationary ring (65) between described machine capping (63) and described stationary ring (65) are axial arranges the second latch (67), the built-in spring of described the second latch (67) (68), described rotating ring (64) is axially contacted and mutually stressed with described stationary ring (65), the upper setting of described machine capping (63) radially connects fluid through-hole (69).
2. a kind of boric acid recirculating pump according to claim 1, it is characterized in that: described spiral case chamber (12) is single volute type spiral case chamber, and described outer pipe (121) is arranged at the top of described spiral case chamber (12); Between the front end of described impeller (2) and the described joint (112) front seal ring (22) is set, between the rear end of described impeller (2) and the described pump cover (3) increasing back sealing ring (23) is set, between described impeller (2) and the described pump shaft (100) impeller nut (24) is set.
3. a kind of boric acid recirculating pump according to claim 2, it is characterized in that: described suction chamber (11) is the straight-tapered suction chamber, and described suction chamber (11) arranges the section area of described suction flange (111) one ends greater than the section area of described joint (112) one ends.
4. a kind of boric acid recirculating pump according to claim 1 is characterized in that: axial hole (31) is set on the described pump cover (3), is communicated with described spiral case chamber (12) and described mechanical seal chamber (61).
5. a kind of boric acid recirculating pump according to claim 1, it is characterized in that: O-ring seals (45) is set at described pump shaft (100) and described dust pan (43) between radially, described bearing cap (42) and described dust pan (43) radially between, along described bearing cap (42) oil seal structure (46) is set axially.
6. a kind of boric acid recirculating pump according to claim 1 is characterized in that: described air cooling bearing support (5) and described pump cover (3) axially between fastening screw (32) is set.
7. a kind of boric acid recirculating pump according to claim 1, it is characterized in that: the sidewall of described axle sleeve (101) arranges hierarchic structure, makes the section area of close described pump cover (3) one sides of described axle sleeve (101) greater than the section area of described axle sleeve (101) near described mechanical seal (6) one sides.
8. a kind of boric acid recirculating pump according to claim 1, it is characterized in that: the bottom of described air cooling bearing support (5) arranges bearing support supporting foot (53), and the bottom of described spiral case chamber (12) arranges pump pin (13).
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| CN 201210083375 CN102606519B (en) | 2012-03-27 | 2012-03-27 | Boric acid recirculation pump |
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| CN 201210083375 CN102606519B (en) | 2012-03-27 | 2012-03-27 | Boric acid recirculation pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104265678B (en) * | 2014-09-26 | 2017-02-15 | 浙江理工大学 | Sealing mechanism for gap between impeller and volute |
| CN105971888A (en) * | 2016-01-11 | 2016-09-28 | 欧技工业设备（江苏）有限公司 | Forced circulation pump with protective shaft sleeve |
| CN106930972A (en) * | 2017-03-16 | 2017-07-07 | 武汉船用机械有限责任公司 | A kind of associated sealing arrangement for bearings for Cargo Oil Pump |
| CN108343614A (en) * | 2018-01-31 | 2018-07-31 | 陕西科技大学 | A kind of efficient sealed methanol oil pump |
| CN108343615A (en) * | 2018-01-31 | 2018-07-31 | 陕西科技大学 | A kind of methanol feed pump |
| CN108916068A (en) * | 2018-08-08 | 2018-11-30 | 陕西科技大学 | A kind of methanol feed pump |
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| CN102606519A (en) | 2012-07-25 |
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