CN203272221U - Fluid dynamic pressure three-level mechanical sealing device of reactor coolant pump - Google Patents
Fluid dynamic pressure three-level mechanical sealing device of reactor coolant pump Download PDFInfo
- Publication number
- CN203272221U CN203272221U CN201320284923.5U CN201320284923U CN203272221U CN 203272221 U CN203272221 U CN 203272221U CN 201320284923 U CN201320284923 U CN 201320284923U CN 203272221 U CN203272221 U CN 203272221U
- Authority
- CN
- China
- Prior art keywords
- stage
- mechanical seal
- ring
- restrictor
- seal
- 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.)
- Withdrawn - After Issue
Links
- 239000002826 coolant Substances 0.000 title claims abstract description 15
- 238000007789 sealing Methods 0.000 title claims description 20
- 239000012530 fluid Substances 0.000 title abstract description 12
- 230000003068 static effect Effects 0.000 claims description 7
- 238000012423 maintenance Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 230000008676 import Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000004807 localization Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000009916 joint effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
- Mechanical Sealing (AREA)
Abstract
本实用新型涉及一种反应堆冷却剂泵流体动压三级机械密封装置,每级机械密封的结构、功能相同,方便相互更换,而四个节流器的结合使用,使三级流体串联动压机械密封形成六种功能失效模式,在某一级机械密封损坏的情况下,仍可使核主泵短期内继续运行,避免核电站瞬时断电,既增强了核主泵的维护,又减小了核电站的经济损失。
The utility model relates to a three-stage fluid dynamic pressure mechanical seal device of a reactor coolant pump. The mechanical seals of each stage have the same structure and function and are convenient for mutual replacement. The combined use of four throttles makes the three-stage fluid dynamic pressure The mechanical seal forms six functional failure modes. In the case of a certain level of mechanical seal damage, the nuclear main pump can still run in a short period of time, avoiding the instantaneous power failure of the nuclear power plant, which not only enhances the maintenance of the nuclear main pump, but also reduces Economic loss of nuclear power plants.
Description
技术领域:本实用新型涉反应堆冷却剂泵流体动压三级机械密封装置。Technical field: The utility model relates to a reactor coolant pump fluid dynamic pressure three-stage mechanical seal device.
背景技术:反应堆冷却剂泵流体动压三级机械密封装置是反应堆冷却剂泵结构中最为核心的重要组成部分,直接关系核主泵在核电站中能否安全、可靠运行。如果密封发生泄漏,将直接导致反应堆停堆,给核电站带来巨大的经济损失,严重时还会造成环境辐射污染。目前,核主泵是我国核电站核岛中唯一没有完全实现国产化的设备。而核主泵的制造市场长期被欧美日等发达国家垄断,由其技术上的先进性,我国在核主泵的设计及制造方面处于被动状态,并一直依赖于进口。Background technology: The reactor coolant pump fluid dynamic pressure three-stage mechanical seal device is the core and important part of the reactor coolant pump structure, which directly affects whether the nuclear main pump can operate safely and reliably in a nuclear power plant. If the seal leaks, it will directly lead to the shutdown of the reactor, which will bring huge economic losses to the nuclear power plant, and even cause environmental radiation pollution in severe cases. At present, the nuclear main pump is the only equipment in the nuclear island of my country's nuclear power plants that has not been fully localized. The nuclear main pump manufacturing market has been monopolized by developed countries such as Europe, America and Japan for a long time. Due to its technological advancement, my country is in a passive state in the design and manufacture of nuclear main pumps and has always relied on imports.
发明内容:本实用新型的目的是公开一种用于反应堆冷却剂泵流体动压三级机械密封装置。本实用新型的技术方案是:一种反应堆冷却剂泵流体动压三级机械密封装置,由三级相同的机械密封串联安装,静环组件(2-2)安装到动环组件(2-1)上位,二者的密封面相接触构成机械密封(2),动环(2-1)通过圆柱销与一号密封轴套(1)进行轴向转动连接,一号外环(3)安装到机械密封(2)外部并由一号导环(4)压紧,二号密封轴套(7)的凹槽与一号密封轴套(1)凸缘套装在一起并由两瓣夹环(6)锁紧形成连合体,相同的机械密封(2)通过圆柱销安装到二号密封轴套(7)上,二号外环(9)装压到一号导环(4)上并由六角头螺钉(8)把合锁紧,第一节流器(10)和第二节流器(11)的接头分别安装到二号外环(9)的下部轴向孔和上部轴向孔内,由六角头螺钉锁紧,第三节流器(14)和第四节流器(15)的接头安装到二号外环(9)上的不同角度处径向孔上,并由六角头螺钉锁紧,二号导环(12)装压到二号外环(9)上并由内六角头螺钉(13)锁紧形成连合体,三级密封轴套(16)的凹槽与二级密封轴套(7)凸缘套装压紧,相同的机械密封(2)通过圆柱销安装固定在三级密封轴套(16)内,三号外环(17)安装二号导环(12)上并由三号导环(18)压紧组成第三级密封腔。SUMMARY OF THE INVENTION: The purpose of this utility model is to disclose a hydrodynamic pressure three-stage mechanical seal device for reactor coolant pumps. The technical solution of the utility model is: a reactor coolant pump fluid dynamic pressure three-stage mechanical seal device, which is installed in series with the same three-stage mechanical seal, and the static ring assembly (2-2) is installed to the dynamic ring assembly (2-1 ) upper position, the sealing surfaces of the two are in contact to form a mechanical seal (2), the moving ring (2-1) is axially connected to the No. 1 sealing sleeve (1) through a cylindrical pin, and the No. The outside of the mechanical seal (2) is pressed tightly by the No. 1 guide ring (4), and the groove of the No. 2 seal shaft sleeve (7) is set together with the flange of the No. 1 seal shaft sleeve (1) and is secured by a two-petal clamp ring ( 6) Locking to form a joint body, the same mechanical seal (2) is installed on the No. 2 sealing bushing (7) through a cylindrical pin, and the No. Lock the hexagon head screw (8), and install the joints of the first restrictor (10) and the second restrictor (11) to the lower axial hole and upper axial hole of the second outer ring (9) respectively Inside, locked by hexagonal head screws, the joints of the third restrictor (14) and the fourth restrictor (15) are installed on the radial holes at different angles on the second outer ring (9), and the hexagonal The No. 2 guide ring (12) is pressed onto the No. 2 outer ring (9) and locked by the hexagon socket head screw (13) to form a joint. The groove of the tertiary seal bushing (16) and the The flange sleeve of the secondary seal (7) is pressed tightly, the same mechanical seal (2) is installed and fixed in the tertiary seal sleeve (16) through cylindrical pins, and the No. 3 outer ring (17) is installed with the No. 2 guide ring ( 12) and compressed by the No. 3 guide ring (18) to form the third-stage sealing cavity.
本实用新型的有益效果是:The beneficial effects of the utility model are:
(1)本实用新型由三级相同的机械密封串联装压而成,系统压力通过四个节流器逐级降压,最终实现密封的可控低压“零泄漏”(零泄漏,指的是反应堆冷却剂的无外泄漏),保证核主泵的安全、可靠运行,并防止环境核辐射污染。(1) The utility model is composed of three stages of the same mechanical seal installed in series, and the system pressure is reduced step by step through four restrictors, and finally realizes the sealed controllable low pressure "zero leakage" (zero leakage refers to No external leakage of reactor coolant), to ensure the safe and reliable operation of nuclear main pumps, and to prevent environmental nuclear radiation pollution.
(2)机械密封摩擦副由动环和静环组成。其中,动环随密封轴套旋转。静环端面设计成特殊的浅槽波纹形状,运转时密封摩擦副之间产生液膜,并处于稳定状态,避免发生干磨擦而降低机械密封的寿命。(2) The mechanical seal friction pair consists of a moving ring and a static ring. Among them, the moving ring rotates with the sealing sleeve. The end face of the static ring is designed as a special shallow groove corrugated shape, and a liquid film is formed between the sealing friction pairs during operation, and it is in a stable state to avoid dry friction and reduce the life of the mechanical seal.
(3)结构上,第一级密封和第二级密封通过两瓣夹环(6)实现了两级密封的整体连接,便于整体拆装,大大节约拆装时间。(3) In terms of structure, the first-stage seal and the second-stage seal realize the overall connection of the two-stage seal through the two-petal clamp ring (6), which is convenient for overall disassembly and assembly, and greatly saves disassembly and assembly time.
(4)三级机械密封装置的串联结构和四个节流器可组成六种功能失效模式,当在某机械密封损坏时可保证主泵在一定时间内仍可安全运行,有助于反应堆冷却剂泵安全停机和维护。(4) The series structure of the three-stage mechanical seal device and four restrictors can form six functional failure modes. When a certain mechanical seal is damaged, it can ensure that the main pump can still run safely within a certain period of time, which is helpful for reactor cooling. The agent pump is safely shut down and maintained.
反应堆冷却剂泵流体动压三级机械密封装置无泄漏原理说明:Explanation of principle of non-leakage principle of reactor coolant pump fluid dynamic pressure three-stage mechanical seal device:
三级流体串联动压机械密封,采用三级相同的流体动压式机械密封分摊密封压力。来自上充泵(核电站另一个设备)的高压注入水(压力高于反应堆冷却剂泵腔内压力),进入第一级密封腔内,再由分别经过两个节流器节流,分别进入第二、三级机械密封装置腔内。进入第一级机械密封腔内的压力为159bar,进入第二级机械密封腔的压力为106bar,进入第三级机械密封装置腔的压力为53bar。进入每级机械密封的冷却水流量为600L/h。使三级串联机械密封的每一级都是同等工况。每级机械密封可控泄漏为5L/h。在初始阶段三级流体动压机械密封芯件每级设计成均能承受全系统压力159bar,但是在主泵正常运行时每级只承受1/3的全系统压力,约53bar。The three-stage fluid dynamic pressure mechanical seal in series adopts the same three-stage fluid dynamic pressure mechanical seal to share the sealing pressure. The high-pressure injection water (higher than the pressure in the reactor coolant pump chamber) from the top charge pump (another device of the nuclear power plant) enters the first-stage sealed chamber, and then is throttled by two restrictors respectively, and then enters the first-stage seal chamber respectively. Secondary and tertiary mechanical seal chambers. The pressure entering the first-stage mechanical seal chamber is 159 bar, the pressure entering the second-stage mechanical seal chamber is 106 bar, and the pressure entering the third-stage mechanical seal chamber is 53 bar. The flow rate of cooling water entering each mechanical seal is 600L/h. Make each stage of the three-stage series mechanical seal have the same working condition. The controllable leakage of each mechanical seal is 5L/h. In the initial stage, each stage of the three-stage hydrodynamic mechanical seal core is designed to withstand the full system pressure of 159bar, but when the main pump is running normally, each stage only bears 1/3 of the full system pressure, about 53bar.
反应堆冷却剂泵流体动压三级机械密封装置的结构特点为非接触式,平衡型,静止式,多弹簧,旋转环端面开设多个大波纹,静环内径附加支撑钢环。三级串联机械密封的前两级集装在一起,第三级为一个单独集装式,每一级与泵体的接口尺寸逐级增大,与泵轴的接口尺寸逐级减小,这样使安装更加方便,快捷。The structural features of the reactor coolant pump fluid dynamic pressure three-stage mechanical seal device are non-contact, balanced, static, and multi-spring. The end face of the rotating ring is provided with multiple large corrugations, and the inner diameter of the static ring is additionally supported by a steel ring. The first two stages of the three-stage series mechanical seal are assembled together, and the third stage is a separate cartridge. The interface size between each stage and the pump body increases step by step, and the interface size with the pump shaft decreases step by step, so that Make installation more convenient and faster.
核电站一回路系统压力是152bar。在主泵正常运行工况下,系统压力通过三级串联机械密封降低到大气压力。The primary loop system pressure of the nuclear power plant is 152bar. Under normal operating conditions of the main pump, the system pressure is reduced to atmospheric pressure through the three-stage series mechanical seal.
由核电站RCV(化学和容积控制)系统的离心式上充泵提供的流量为2000L/h,压力为159bar的高压轴密封注入水进入轴密封系统后,由于轴密封注入水的压力高于一回路系统压力,因此该注入水分成三个流向。一个流向以流量800L/h至水润滑径向轴承进入到一回路系统内,防止反应堆冷却剂进入密封腔内。另两个流向分别以流量600L/h进入第二级机械密封和第三级机械密封装置,其压力分别为106bar和53bar。该分向流是由第一节流器、第二节流器、第三节流器和第四节流器共四个节流器来完成的。注入水经过第一节流器压力降为106bar时,第一级机械密封前后端的压力差为53bar,此时第一级机械密封面的泄漏量为5L/h,其主要是密封面的润滑和散热作用。这5L/h的泄漏流量流到第二级机械密封前,压力已降为106bar。同样原理,经过相同的机械密封,第二、三级机械密封和节流器的共同作用下,压力为159bar高压密封注入水的压力也降到2~3bar,分别注入核电站化学和容积控制系统(RCV),且从第三级机械密封的密封面泄漏出来的5L/h泄漏量流入低压泄漏系统。After the high-pressure shaft seal injection water with a flow rate of 2000L/h and a pressure of 159bar provided by the centrifugal charging pump of the RCV (chemical and volume control) system of the nuclear power plant enters the shaft seal system, the pressure of the shaft seal injection water is higher than that of the primary circuit System pressure, so the injection water is divided into three flow directions. One flow direction enters the primary circuit system with a flow rate of 800L/h to the water-lubricated radial bearing to prevent the reactor coolant from entering the sealed cavity. The other two flow directions enter the second-stage mechanical seal and the third-stage mechanical seal with a flow rate of 600L/h respectively, and their pressures are 106bar and 53bar respectively. The diverted flow is accomplished by a total of four restrictors: the first restrictor, the second restrictor, the third restrictor and the fourth restrictor. When the pressure drop of the injected water through the first restrictor is 106bar, the pressure difference between the front and rear ends of the first-stage mechanical seal is 53bar. At this time, the leakage of the first-stage mechanical seal surface is 5L/h, which is mainly due to the lubrication of the sealing surface and cooling effect. Before the leakage flow of 5L/h flows to the second-stage mechanical seal, the pressure has dropped to 106bar. The same principle, through the same mechanical seal, under the joint action of the second and third mechanical seals and the restrictor, the pressure of the water injected into the high-pressure seal with a pressure of 159bar is also reduced to 2-3bar, and injected into the chemical and volume control system of the nuclear power plant respectively ( RCV), and the 5L/h leakage from the sealing surface of the third-stage mechanical seal flows into the low-pressure leakage system.
三级流体动压机械密封的研制成功,将使我国核主泵的国产化工作迈进一大步,从此摆脱受制国外进口的尴尬局面,填补国家始终未实现核主泵国产化的空白历史,替代进口,节约外汇,也为国家核电在国际市场中的竞争及向第三方出口做好条件准备。The successful development of the three-stage hydrodynamic mechanical seal will make a big step forward in the localization of nuclear main pumps in my country, get rid of the embarrassing situation of being restricted by foreign imports, fill in the blank history that the country has never realized the localization of nuclear main pumps, and replace Import, save foreign exchange, and also prepare for the competition of national nuclear power in the international market and export to third parties.
附图说明Description of drawings
图1是反应堆冷却剂泵流体动压三级机械密封装置剖视图Figure 1 is a cross-sectional view of the reactor coolant pump fluid dynamic pressure three-stage mechanical seal device
图2是机械密封结构剖视放大图Figure 2 is an enlarged cross-sectional view of the mechanical seal structure
图3是第一节流器Figure 3 is the first restrictor
图4是第二节流器Figure 4 is the second restrictor
图5是第三节流器Figure 5 is the third restrictor
图6是第四节流器Figure 6 is the fourth restrictor
具体实施方式Detailed ways
如图1所示,反应堆冷却剂泵流体动压三级机械密封装置由三级相同的机械密封串联安装,如图2所示,静环组件2-2安装到动环组件2-1上位,二者的密封面相接触构成机械密封2,动环2-1通过圆柱销与一号密封轴套1进行轴向转动连接,一号外环3安装到机械密封2外部并由一号导环4压紧,二号密封轴套7的凹槽与一号密封轴套1凸缘套装在一起并由两瓣夹环6锁紧形成连合体,相同的机械密封2通过圆柱销安装到二号密封轴套7上,二号外环9装压到一号导环4上并由六角头螺钉8把合锁紧,如图3、图4所示,第一节流器10和第二节流器11的接头分别安装到二号外环9的下部轴向孔和上部轴向孔内,由六角头螺钉锁紧,如图4、图5所示,第三节流器14和第四节流器15的接头安装到二号外环9上的不同角度处径向孔上,并由六角头螺钉锁紧,二号导环12装压到二号外环9上并由内六角头螺钉13锁紧形成连合体,三级密封轴套16的凹槽与二级密封轴套7凸缘套装压紧,相同的机械密封2通过圆柱销安装固定在三级密封轴套16内,三号外环17安装二号导环12上并由三号导环18压紧组成第三级密封腔。As shown in Figure 1, the reactor coolant pump fluid dynamic pressure three-stage mechanical seal device is installed in series with the same three-stage mechanical seal, as shown in Figure 2, the static ring assembly 2-2 is installed on the upper position of the dynamic ring assembly 2-1, The sealing surfaces of the two are in contact to form a
本实用新型采用三级相同的机械密封2分别安装到一号密封轴套1、二号密封轴套7、三级密封轴套16上,并和第一节流器10、第二节流器11、第三节流器14和第四节流器15组成六种功能失效模式,保证核主泵在某级机械密封损坏的情况下仍可短期内运行,为核主泵的维护争取时间,减小核电站的经济损失。The utility model adopts the same three-level
本实用新型每级机械密封的结构、功能相同,可相互替换,有利于核主泵的维护,适用范围广。The mechanical seals of each stage of the utility model have the same structure and function and can be replaced with each other, which is beneficial to the maintenance of the nuclear main pump and has a wide application range.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201320284923.5U CN203272221U (en) | 2013-05-22 | 2013-05-22 | Fluid dynamic pressure three-level mechanical sealing device of reactor coolant pump |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201320284923.5U CN203272221U (en) | 2013-05-22 | 2013-05-22 | Fluid dynamic pressure three-level mechanical sealing device of reactor coolant pump |
Publications (1)
Publication Number | Publication Date |
---|---|
CN203272221U true CN203272221U (en) | 2013-11-06 |
Family
ID=49502646
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201320284923.5U Withdrawn - After Issue CN203272221U (en) | 2013-05-22 | 2013-05-22 | Fluid dynamic pressure three-level mechanical sealing device of reactor coolant pump |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN203272221U (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105041709A (en) * | 2015-06-12 | 2015-11-11 | 霍凤伟 | Fluid dynamic pressure type mechanical seal used for nuclear main pump and mechanical seal system of nuclear main pump |
CN105673551A (en) * | 2014-11-19 | 2016-06-15 | 中广核工程有限公司 | Nuclear power plant nuclear reactor coolant pump and static-pressure shaft seal assembly thereof |
CN109434730A (en) * | 2018-12-12 | 2019-03-08 | 哈尔滨电气动力装备有限公司 | Reactor coolant pump seals room installation and removal positioning device |
-
2013
- 2013-05-22 CN CN201320284923.5U patent/CN203272221U/en not_active Withdrawn - After Issue
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105673551A (en) * | 2014-11-19 | 2016-06-15 | 中广核工程有限公司 | Nuclear power plant nuclear reactor coolant pump and static-pressure shaft seal assembly thereof |
CN105673551B (en) * | 2014-11-19 | 2018-03-06 | 中广核工程有限公司 | Nuclear power plant's nuclear reactor coolant pump and its static pressure gland seal assembly |
CN105041709A (en) * | 2015-06-12 | 2015-11-11 | 霍凤伟 | Fluid dynamic pressure type mechanical seal used for nuclear main pump and mechanical seal system of nuclear main pump |
CN109434730A (en) * | 2018-12-12 | 2019-03-08 | 哈尔滨电气动力装备有限公司 | Reactor coolant pump seals room installation and removal positioning device |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN103256246B (en) | Fluid-dynamic-pressure three-level mechanical sealing device for reactor coolant pump | |
US9903473B2 (en) | Method for carrying out emergent shaft sealing for reactor coolant pump and shaft sealing assembly | |
CN103821757B (en) | There is the active and static pressure mechanical seal combined nuclear main pump gland seal system of parking sealer | |
CN103307284B (en) | There is the Split mechanical seal of self-tightening sealing ability | |
CN203272221U (en) | Fluid dynamic pressure three-level mechanical sealing device of reactor coolant pump | |
CN103790855A (en) | Nuclear main pump mechanical seal system with active and passive shutdown sealing | |
CN108223799A (en) | It is a kind of can bidirectional rotation Hydrodynamic pressure type mechanical seal structure | |
CN202171002U (en) | Conical surface mechanical sealing device | |
CN203363185U (en) | Split type mechanical seal with self-tightening seal capacity | |
CN112963543B (en) | A Diffusing Self-Pumping Hydrodynamic and Static Pressure Mechanical Seal | |
CN202914397U (en) | Guide vane main feed water pump for nuclear power plant conventional island | |
CN104329480B (en) | A kind of electrical ball valve | |
CN203783954U (en) | Nuclear main pump three-level mechanical sealing device with passive parking sealing device | |
CN202188125U (en) | Spherical mechanical sealing device | |
CN210769339U (en) | Assembled high-speed low-temperature centrifugal pump | |
CN221299585U (en) | Nuclear power is with high temperature high inlet pressure single-stage circulating pump | |
CN102174963A (en) | Spherical mechanical sealing device | |
CN207018195U (en) | A kind of mechanical seal structure of high pressure impeller pump | |
CN201818792U (en) | A face sealing device | |
CN204677801U (en) | A kind of eccentric ball valve structure | |
CN214998245U (en) | High-temperature high-pressure high-speed chemical pump | |
CN203730391U (en) | Nuclear main pump mechanical seal device with active and passive parking seal | |
CN206496050U (en) | A kind of new shuttle valve | |
CN204187035U (en) | A kind of electric ball valve | |
CN219549181U (en) | Centrifugal pump seal chamber decompression system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
AV01 | Patent right actively abandoned |
Granted publication date: 20131106 Effective date of abandoning: 20150520 |
|
AV01 | Patent right actively abandoned |
Granted publication date: 20131106 Effective date of abandoning: 20150520 |
|
RGAV | Abandon patent right to avoid regrant |