CN203978913U - A kind of improved two-way through-flow pump - Google Patents
A kind of improved two-way through-flow pump Download PDFInfo
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- CN203978913U CN203978913U CN201420382644.7U CN201420382644U CN203978913U CN 203978913 U CN203978913 U CN 203978913U CN 201420382644 U CN201420382644 U CN 201420382644U CN 203978913 U CN203978913 U CN 203978913U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 64
- 239000002184 metal Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims 1
- 230000001360 synchronised effect Effects 0.000 abstract description 21
- 210000000476 body water Anatomy 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000002262 irrigation Effects 0.000 description 9
- 238000003973 irrigation Methods 0.000 description 9
- 230000002457 bidirectional effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 239000003657 drainage water Substances 0.000 description 1
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Abstract
一种改进的双向贯流泵，属于水力机械设计与制造、水利水电工程技术领域。包括泵轴、锥形管、叶轮室、导叶体外壳，锥形管内设有叶轮导水锥，叶轮室内设有叶轮轮毂，叶轮轮毂上设有S形水泵叶片，导叶体外壳内设有导叶轮毂、导叶体导水锥，导叶轮毂上设有导叶片；泵轴依次穿过叶轮导水锥、叶轮轮毂和导叶轮毂，其特征是，还设有同步调节环，同步调节环套置在导叶体外壳上，导叶片通过枢轴连接在导叶轮毂与导叶体外壳之间，枢轴的一端插入导叶轮毂，另一端伸出导叶体外壳，并通过拐臂、摆杆与同步调节环活动连接。本实用新型可改善双向贯流泵的进水条件，扩大水泵高效运行范围和效率。
An improved two-way tubular flow pump belongs to the technical fields of hydraulic machinery design and manufacture, and water conservancy and hydropower engineering. Including the pump shaft, conical tube, impeller chamber, guide vane body casing, the impeller water guiding cone is arranged in the conical pipe, the impeller hub is arranged in the impeller chamber, S-shaped water pump blades are arranged on the impeller hub, and the guide vane body casing is provided with Guide vane hub, guide vane body water guide cone, guide vanes are arranged on the guide vane hub; the pump shaft passes through the impeller water guide cone, impeller hub and guide vane hub in turn, and it is characterized in that there is also a synchronous adjustment ring for synchronous adjustment The ring is set on the guide vane body shell, and the guide vane is connected between the guide vane hub and the guide vane body shell through a pivot, one end of the pivot is inserted into the guide vane hub, and the other end extends out of the guide vane body shell, and passes through the crank arm , The swing rod is flexibly connected with the synchronous adjustment ring. The utility model can improve the water inlet condition of the two-way through-flow pump, and expand the high-efficiency operation range and efficiency of the water pump.
Description
技术领域 technical field
本实用新型涉及一种贯流泵的结构型式，属于水力机械设计与制造、水利水电工程技术领域。 The utility model relates to a structure type of a tubular pump, which belongs to the technical field of hydraulic machinery design and manufacture, and water conservancy and hydropower engineering.
背景技术 Background technique
在圩区、滨湖和临海等低扬程地区，常常需要泵站在洪水季节实现排涝和干旱季节实现灌溉的任务。现有的贯流泵一般为单向泵，单向运行，只能实现排涝或灌溉一种任务。需要贯流泵作双向运行时，大都采取对称设计，需作反向运行时，通过起吊水泵部件，旋转180度再安装的方式，存在拆卸和安装困难、耗时长等缺点；能实现双向运行的双向进出水流道，水泵扬程较高，立式安装，在超低扬程（1m左右）情况下，无法采用；现有的双向贯流泵是按正向运行设计的，在双向贯流泵作反向运行时，水泵叶轮反转，原来正向运行时的后导叶变成了反向运行时的前导叶，导叶的入流角变成了出流角，不再与反向运行时的水泵叶轮的入流角相匹配，使得反向运行时的贯流泵效率大幅度降低；双向贯流泵导叶片的安放角通常不可调节，水泵在非设计工况运行时，效率降低造成能量浪费。 In low-lift areas such as polders, lakesides, and coastal areas, pump stations are often required to perform the tasks of drainage in flood seasons and irrigation in dry seasons. Existing tubular pumps are generally one-way pumps that operate in one direction and can only perform one task of drainage or irrigation. When the bidirectional operation of the tubular pump is required, most of them adopt a symmetrical design. When the reverse operation is required, the pump components are lifted and rotated 180 degrees before installation, which has disadvantages such as difficulty in disassembly and installation and long time consumption; Two-way water inlet and outlet channels, the pump head is high, and it is installed vertically. It cannot be used in the case of ultra-low head (about 1m); When running in the opposite direction, the impeller of the water pump is reversed, and the rear guide vane in the forward operation becomes the front guide vane in the reverse operation, and the inflow angle of the guide vane becomes the outflow angle, which is no longer the same as that of the water pump in the reverse operation. The inflow angle of the impeller is matched, so that the efficiency of the tubular pump is greatly reduced during reverse operation; the placement angle of the guide vane of the bidirectional tubular pump is usually not adjustable, and when the pump is running in non-design conditions, the efficiency is reduced and energy is wasted.
实用新型内容 Utility model content
本实用新型的目的是针对现有贯流泵的不足，提供一种改进的双向贯流泵，采用S形水泵叶片，通过改变水泵转向和调节导叶片入流角和出流角，实现灌溉和排涝双向高效工作。 The purpose of this utility model is to provide an improved two-way through-flow pump for the deficiencies of the existing through-flow pump, which adopts S-shaped water pump blades, and realizes irrigation and drainage by changing the direction of the water pump and adjusting the inflow angle and outflow angle of the guide blades. Two-way efficient work.
本实用新型的目的是通过以下技术方案实现的：一种改进的双向贯流泵，包括泵轴、锥形管、叶轮室、导叶体外壳，所述叶轮室为水平中开式叶轮室，锥形管、叶轮室、导叶体外壳依次通过法兰、螺栓联接； The purpose of this utility model is achieved through the following technical solutions: an improved two-way through-flow pump, including a pump shaft, a tapered pipe, an impeller chamber, and a guide vane casing, and the impeller chamber is a horizontal split impeller chamber, The conical pipe, impeller chamber, and guide vane housing are connected by flanges and bolts in turn;
所述锥形管内设有叶轮导水锥，所述叶轮室内设有叶轮轮毂，叶轮轮毂上设有水泵叶片，所述导叶体外壳内设有导叶轮毂、导叶体导水锥，所述导叶轮毂上设有导叶片，叶轮导水锥与叶轮轮毂联接，导叶体导水锥与导叶轮毂联接； The conical pipe is provided with an impeller water guide cone, the impeller chamber is provided with an impeller hub, the impeller hub is provided with water pump blades, and the guide vane shell is provided with a guide vane hub and a guide vane body water guide cone. The hub of the guide vane is provided with guide blades, the water guide cone of the impeller is connected with the hub of the impeller, and the water guide cone of the guide vane body is connected with the hub of the guide vane;
所述泵轴依次穿过叶轮导水锥、叶轮轮毂和导叶轮毂，并支承连接在导叶轮毂内设置的轴承上，叶轮轮毂通过键与泵轴联接， The pump shaft passes through the water guide cone of the impeller, the hub of the impeller and the hub of the guide vane in turn, and is supported and connected to the bearing provided in the hub of the guide vane. The hub of the impeller is connected with the pump shaft through a key.
其特征是，还设有同步调节环，同步调节环套置在所述导叶体外壳上，所述导叶片通过枢轴连接在导叶轮毂与导叶体外壳之间，枢轴的一端插入导叶轮毂，另一端伸出导叶体外壳，并通过拐臂、摆杆与同步调节环活动连接。 It is characterized in that a synchronous adjustment ring is also provided, and the synchronous adjustment ring is sleeved on the guide vane shell, the guide vane is connected between the guide vane hub and the guide vane shell through a pivot, and one end of the pivot is inserted into the The other end of the guide vane hub protrudes from the guide vane casing, and is movably connected with the synchronous adjustment ring through the crank arm and the swing rod.
所述枢轴的另一端与拐臂的一端连接，拐臂的另一端通过插销组件与摆杆的一端活动连接，摆杆的另一端通过插销组件活动连接在同步调节环上，同步调节环通过插销组件和插销组件驱动摆杆和拐臂运动，带动导叶片绕其枢轴旋转。 The other end of the pivot is connected to one end of the crank arm, and the other end of the crank arm is movably connected to one end of the swing rod through the latch assembly, and the other end of the swing rod is movably connected to the synchronous adjustment ring through the latch assembly, and the synchronous adjustment ring passes through The latch assembly and the latch assembly drive the swing rod and the crank arm to move, and drive the guide vane to rotate around its pivot.
所述枢轴与导叶体外壳连接处设有密封件。 A seal is provided at the joint between the pivot shaft and the guide vane housing.
所述同步调节环为金属实心圆环。 The synchronous adjustment ring is a metal solid ring.
所述导叶体外壳内的泵轴轴端设有锁紧螺母，锁紧螺母为2片，其末端带闭锁片。 The shaft end of the pump shaft in the guide vane shell is provided with a locking nut, and the locking nuts are 2 pieces, and the ends of the locking nuts are provided with locking pieces.
所述导叶片、枢轴、拐臂、摆杆数目相同，并在各自的周向上均匀分布。 The numbers of the guide vanes, pivots, crank arms, and swing bars are the same, and are evenly distributed in their respective circumferential directions.
所述同步调节环的内径大于导叶体外壳外径。 The inner diameter of the synchronous adjusting ring is larger than the outer diameter of the guide vane shell.
本实用新型中导叶片可绕其枢轴旋转，枢轴的一端插入导叶轮毂，另一端伸出导叶体外壳，与拐臂相连，通过密封件实现枢轴与拐臂与导叶体外壳之间的密封。同步调节环为金属实心圆环，通过插销组件与摆杆相连，摆杆通过插销组件和枢轴与拐臂联接，同步调节环作上下运动（沿导叶体外壳轴向运动），摆杆通过插销组件带动拐臂摆动，驱动导叶片绕其枢轴作旋转运动。S形水泵叶片采用对称设计方式，通过改变水泵叶轮转向，叶片的工作面和吸力面互换，完成灌溉和排涝作业。叶轮室为水平中开式叶轮室，拧开叶轮室与锥形管和导叶体外壳的联接螺栓，可进行水泵叶片安放角的手工调节。锁紧螺母有2片，末端带闭锁片，可有效防止松脱，可通过锁紧螺母调节S形水泵叶片与叶轮室之间的间隙。 The guide vane in the utility model can rotate around its pivot, one end of the pivot is inserted into the guide vane hub, and the other end protrudes from the guide vane body shell, and is connected with the crank arm, and the pivot and the crank arm and the guide vane body shell are realized through the seal seal between. The synchronous adjustment ring is a metal solid ring, which is connected with the swing rod through the pin assembly, and the swing rod is connected with the crank arm through the pin assembly and the pivot shaft. The latch assembly drives the crank arm to swing, and drives the guide vane to rotate around its pivot. The S-shaped water pump blade adopts a symmetrical design method. By changing the direction of the water pump impeller, the working surface and suction surface of the blade are interchanged to complete irrigation and drainage operations. The impeller chamber is a horizontal split type impeller chamber. Unscrew the connecting bolts between the impeller chamber, the conical pipe and the guide vane housing to manually adjust the placement angle of the pump blades. The lock nut has 2 pieces, and the end has a locking piece, which can effectively prevent loosening. The gap between the S-shaped water pump blade and the impeller chamber can be adjusted through the lock nut.
本实用新型采用S形双向水泵叶片，通过改变水泵转向，实现灌溉和排涝双向工作；通过同步调节环和摆杆的作用，带动枢轴与拐臂旋转，调节导叶片入流角和出流角，实现与S形双向水泵叶片安放角相协调，改善双向贯流泵进水条件，扩大水泵高效运行范围和效率。 The utility model adopts S-shaped bidirectional water pump blades, and realizes two-way work of irrigation and drainage by changing the direction of the water pump; through the function of the synchronous adjustment ring and the swing rod, the pivot and the crank arm are driven to rotate, and the inflow angle and outflow angle of the guide blade are adjusted. Realize coordination with the S-shaped two-way water pump blade placement angle, improve the water inlet conditions of the two-way through-flow pump, and expand the high-efficiency operation range and efficiency of the water pump.
附图说明 Description of drawings
图1为本实用新型的水平剖面结构示意图； Fig. 1 is the horizontal sectional structural representation of the utility model;
图2为图1中A-A向剖视示意图； Fig. 2 is a schematic sectional view of A-A in Fig. 1;
图3为排涝工况水泵叶片与导叶片位置图； Figure 3 is a position diagram of the water pump blades and guide vanes in the flood drainage working condition;
图4为灌溉工况水泵叶片与导叶片位置图； Fig. 4 is a position diagram of water pump blades and guide vanes in irrigation working conditions;
图中：1泵轴、2锥形管、3叶轮导水锥、4叶轮轮毂、5叶轮室、6 S形水泵叶片、7导叶轮毂、8导叶体外壳、9导叶片、10密封件、11拐臂、12摆杆、13同步调节环、14锁紧螺母、15导叶体导水锥、16插销组件、17插销组件、18轴承、19键。 In the figure: 1 pump shaft, 2 conical pipe, 3 impeller water guide cone, 4 impeller hub, 5 impeller chamber, 6 S-shaped water pump blade, 7 guide vane hub, 8 guide vane shell, 9 guide vane, 10 seal , 11 crank arm, 12 swing rod, 13 synchronous adjustment ring, 14 lock nut, 15 guide vane water guide cone, 16 pin assembly, 17 pin assembly, 18 bearing, 19 key.
具体实施方式 Detailed ways
一种改进的双向贯流泵，包括泵轴1、锥形管2、叶轮室5、导叶体外壳8，叶轮室为水平中开式叶轮室，锥形管、叶轮室、导叶体外壳依次通过法兰、螺栓联接。 An improved two-way through-flow pump, including a pump shaft 1, a tapered pipe 2, an impeller chamber 5, and a guide vane housing 8, the impeller chamber is a horizontal split impeller chamber, a conical pipe, an impeller chamber, and a guide vane housing Connected by flanges and bolts in turn.
锥形管内设有叶轮导水锥3，叶轮室内设有叶轮轮毂4，叶轮轮毂上设有对称设计的S形水泵叶片6，导叶体外壳内8设有导叶轮毂7、导叶体导水锥15，导叶轮毂7上设有导叶片9，叶轮导水锥3与叶轮轮毂4联接，导叶体导水锥15与导叶轮毂7联接。 The impeller water guide cone 3 is arranged in the conical pipe, the impeller hub 4 is arranged in the impeller chamber, the symmetrically designed S-shaped water pump blades 6 are arranged on the impeller hub, the guide vane body shell 8 is provided with the guide vane hub 7, the guide vane body guide Water cone 15, guide vane hub 7 is provided with guide vane 9, impeller water guide cone 3 is connected with impeller hub 4, guide vane body water guide cone 15 is connected with guide vane hub 7.
泵轴1依次穿过叶轮导水锥3、叶轮轮毂4和导叶轮毂7，并支承连接在导叶轮毂7内设置的轴承18上，叶轮轮毂4通过键19与泵轴1联接。 The pump shaft 1 passes through the impeller guide cone 3, the impeller hub 4 and the guide vane hub 7 in turn, and is supported and connected to the bearing 18 provided in the guide vane hub 7. The impeller hub 4 is connected to the pump shaft 1 through a key 19.
还设有同步调节环13（金属实心圆环），同步调节环13的内径大于导叶体外壳8外径，同步调节环套置在所述导叶体外壳8上，导叶片9通过枢轴连接在导叶轮毂7与导叶体外壳8之间，枢轴的一端插入导叶轮毂，另一端与拐臂11的一端连接，拐臂的另一端通过插销组件16与摆杆12的一端活动连接，摆杆的另一端通过插销组件17活动连接在同步调节环13上，枢轴与导叶体外壳连接处设有密封件10。同步调节环13通过插销组件16和插销组件17驱动摆杆12和拐臂11运动，带动导叶片9绕其枢轴旋转。导叶片、枢轴、拐臂、摆杆数目相同，并在各自的周向上均匀分布。 There is also a synchronous adjustment ring 13 (metal solid ring), the inner diameter of the synchronous adjustment ring 13 is larger than the outer diameter of the guide vane shell 8, the synchronous adjustment ring is set on the guide vane shell 8, and the guide vane 9 passes through the pivot Connected between the guide vane hub 7 and the guide vane body shell 8, one end of the pivot is inserted into the guide vane hub, the other end is connected to one end of the crank arm 11, and the other end of the crank arm moves with one end of the swing rod 12 through the latch assembly 16 Connection, the other end of the swing rod is movably connected to the synchronous adjustment ring 13 through the latch assembly 17, and a seal 10 is provided at the joint between the pivot and the guide vane shell. The synchronous adjustment ring 13 drives the swing rod 12 and the crank arm 11 to move through the latch assembly 16 and the latch assembly 17, and drives the guide vane 9 to rotate around its pivot. The number of guide vanes, pivots, crank arms, and swing bars is the same, and they are evenly distributed in their respective circumferential directions.
导叶体外壳内的泵轴轴端设有锁紧螺母14，锁紧螺母为2片，其末端带闭锁片。 The shaft end of the pump shaft in the guide vane shell is provided with a locking nut 14, and the locking nuts are 2 pieces with locking pieces at the ends.
本实用新型中，S形水泵叶片6为对称设计,即S形水泵叶片为中心对称图形。叶轮轮毂4通过键19传递泵轴1的扭矩，带动安装在叶轮轮毂4上的S形水泵叶片6旋转，通过锁紧螺母14调节S形水泵叶片6与叶轮室5的间隙(通过锁紧螺母的拧紧或拧松，泵轴可可以在一定范围内作前后运动，带动叶轮轮毂前后运动，安装在轮毂上的水泵叶片随之运动，从而改变叶片与泵壳之间的间隙大小)，S形水泵叶片6的安放角可进行人工半调节。 In the present utility model, the S-shaped water pump blade 6 is a symmetrical design, that is, the S-shaped water pump blade is a centrally symmetrical figure. The impeller hub 4 transmits the torque of the pump shaft 1 through the key 19, drives the S-shaped water pump blade 6 installed on the impeller hub 4 to rotate, and adjusts the gap between the S-shaped water pump blade 6 and the impeller chamber 5 through the lock nut 14 (through the lock nut The pump shaft can move forward and backward within a certain range, driving the impeller hub to move forward and backward, and the water pump blades installed on the hub move accordingly, thereby changing the gap between the blade and the pump casing), S-shaped The laying angle of water pump blade 6 can carry out manual semi-regulation.
导叶片9通过枢轴与拐臂11安装在导叶轮毂7与导叶体外壳8之间，同步调节环13作上下运动时，通过插销组件16和插销组件17，驱动摆杆12和枢轴与拐臂11运动，带动导叶片9绕其枢轴旋转。枢轴与拐臂11与导叶体外壳8通过密封件10密封。 The guide vane 9 is installed between the guide vane hub 7 and the guide vane body casing 8 through the pivot shaft and the crank arm 11. When the synchronous adjustment ring 13 moves up and down, the swing lever 12 and the pivot shaft are driven through the latch assembly 16 and the latch assembly 17. It moves with the crank arm 11 to drive the guide vane 9 to rotate around its pivot. The pivot and crank arm 11 are sealed with the guide vane housing 8 by a seal 10 .
排涝工况下，如图3所示：顺水流方向看，S形水泵叶片6逆时针旋转（水流从左向右），水流从锥形管2进入，水泵做功，获得能量的水体从叶轮室5进入导叶体，绕流导叶片9，从导叶体外壳8排出，完成排涝工作。根据水泵选型时确定的水泵叶片安放角，通过同步调节环13，调整导叶片9 的入流角，与S形水泵叶片6的出流角相匹配，扩大排涝水泵运行的高效区域范围。 Under flood drainage conditions, as shown in Figure 3: Viewed along the direction of the water flow, the S-shaped water pump blade 6 rotates counterclockwise (the water flow is from left to right), the water flow enters from the conical pipe 2, the water pump does work, and the water body that obtains energy flows from the impeller chamber 5 enters the guide vane body, flows around the guide vane 9, and is discharged from the guide vane body shell 8 to complete the drainage work. According to the placement angle of the water pump blade determined during the pump type selection, the inflow angle of the guide vane 9 is adjusted through the synchronous adjustment ring 13 to match the outflow angle of the S-shaped water pump blade 6 to expand the efficient area of the drainage water pump operation.
灌溉工况下，如图4所示：顺水流方向看S形水泵叶片6逆时针旋转（水流从右向左），水流从导叶体外壳8进入，绕流导叶片9，进入叶轮室，水泵做功，获得能量的水体从叶轮室5排出，从锥形管2排出，完成灌溉工作。在灌溉工况下，通过同步调节环13，大幅度调整导叶片9 的出流角，使之与S形水泵叶片6的入流角相匹配，改善水泵进水条件，提高水泵效率。 Under irrigation conditions, as shown in Figure 4: the S-shaped water pump blade 6 rotates counterclockwise when viewed along the direction of water flow (the water flow is from right to left), the water flow enters from the guide vane shell 8, flows around the guide vane 9, and enters the impeller chamber. The water pump does work, and the energy-obtained water body is discharged from the impeller chamber 5 and discharged from the conical pipe 2 to complete the irrigation work. Under irrigation conditions, through the synchronous adjustment ring 13, the outflow angle of the guide vane 9 is greatly adjusted to match the inflow angle of the S-shaped water pump blade 6, so as to improve the water inlet conditions of the water pump and improve the efficiency of the water pump.
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| CN201420382644.7U CN203978913U (en) | 2014-07-11 | 2014-07-11 | A kind of improved two-way through-flow pump |
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| CN201420382644.7U CN203978913U (en) | 2014-07-11 | 2014-07-11 | A kind of improved two-way through-flow pump |
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| CN203978913U true CN203978913U (en) | 2014-12-03 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106351869A (en) * | 2016-11-03 | 2017-01-25 | 江苏省水利勘测设计研究院有限公司 | Coaxial double-impeller axial flow blade pump with adjustable front impeller blade angle |
| CN107299874A (en) * | 2016-12-14 | 2017-10-27 | 江苏国泉泵业制造有限公司 | A kind of axial flow pump hydraulic turbine with double-clutch mechanism |
| CN108757552A (en) * | 2018-08-05 | 2018-11-06 | 孙大飞 | Full angle blade control device and its adjusting method |
| CN110701061A (en) * | 2019-11-26 | 2020-01-17 | 扬州大学 | Multistage tubular pump device with novel structure |
| CN114109843A (en) * | 2021-12-15 | 2022-03-01 | 合肥恒大江海泵业股份有限公司 | Bidirectional tubular pump with adjustable front guide vane |
-
2014
- 2014-07-11 CN CN201420382644.7U patent/CN203978913U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106351869A (en) * | 2016-11-03 | 2017-01-25 | 江苏省水利勘测设计研究院有限公司 | Coaxial double-impeller axial flow blade pump with adjustable front impeller blade angle |
| CN107299874A (en) * | 2016-12-14 | 2017-10-27 | 江苏国泉泵业制造有限公司 | A kind of axial flow pump hydraulic turbine with double-clutch mechanism |
| CN107299874B (en) * | 2016-12-14 | 2019-03-19 | 江苏国泉泵业制造有限公司 | A kind of axial flow pump hydraulic turbine with double-clutch mechanism |
| CN108757552A (en) * | 2018-08-05 | 2018-11-06 | 孙大飞 | Full angle blade control device and its adjusting method |
| CN108757552B (en) * | 2018-08-05 | 2024-05-07 | 孙大飞 | Full-angle blade adjusting device and adjusting method thereof |
| CN110701061A (en) * | 2019-11-26 | 2020-01-17 | 扬州大学 | Multistage tubular pump device with novel structure |
| CN114109843A (en) * | 2021-12-15 | 2022-03-01 | 合肥恒大江海泵业股份有限公司 | Bidirectional tubular pump with adjustable front guide vane |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141203 Termination date: 20170711 |
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| CF01 | Termination of patent right due to non-payment of annual fee |