CN204738920U - A reciprocating piston pump for liquefied natural gas cylinders for automobiles - Google Patents
A reciprocating piston pump for liquefied natural gas cylinders for automobiles Download PDFInfo
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- CN204738920U CN204738920U CN201520465019.3U CN201520465019U CN204738920U CN 204738920 U CN204738920 U CN 204738920U CN 201520465019 U CN201520465019 U CN 201520465019U CN 204738920 U CN204738920 U CN 204738920U
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Abstract
实用新型公开了一种汽车用液化天然气气瓶的往复活塞泵,包括封闭的泵送腔体以及可在所述的泵送腔体内往复运动的活塞体,该活塞体由液压驱动,在泵送腔体的进液口处由单向阀一封堵,在泵送腔体的出液口处由单向阀二封堵,其中单向阀一和单向阀二的封堵方向相反,所述活塞体朝向进液口运动时打开单向阀二,所述的活塞体反向进液口运动时打开单向阀一。采用液压驱动的活塞泵,实现对于LNG抽取的自动控制,并且设计了封闭的泵送腔体,便于活塞泵在LNG抽取过程中的压力控制,相比自增压方式,抽取LNG之后,LNG瓶内残留小,并且在泵送腔体的进液口和出液口都采用了单向阀设计,不仅保证了泵送腔体的密闭环境还可以防治液体回流。
The utility model discloses a reciprocating piston pump for liquefied natural gas cylinders for automobiles, which includes a closed pumping cavity and a piston body that can reciprocate in the pumping cavity. The liquid inlet of the cavity is blocked by a one-way valve, and the liquid outlet of the pumping cavity is blocked by a one-way valve two, wherein the blocking directions of the one-way valve one and one-way valve two are opposite, so When the piston moves toward the liquid inlet, the second check valve is opened, and when the piston moves against the liquid inlet, the first check valve is opened. The hydraulically driven piston pump is used to realize the automatic control of LNG extraction, and a closed pumping chamber is designed to facilitate the pressure control of the piston pump during the LNG extraction process. Compared with the self-pressurization method, after extracting LNG, the LNG bottle The internal residue is small, and the one-way valve design is adopted at the liquid inlet and outlet of the pumping chamber, which not only ensures the airtight environment of the pumping chamber but also prevents liquid backflow.
Description
技术领域technical field
本实用新型涉及LNG输出设备,尤其是一种汽车用液化天然气气瓶的往复活塞泵。The utility model relates to LNG output equipment, in particular to a reciprocating piston pump for a liquefied natural gas cylinder for automobiles.
背景技术Background technique
LNG(liquefied natural gas)即液化天然气,其主要成分是甲烷。由于LNG相比汽油或者柴油具备更大的能耗优势和环保优势,所以为大多数汽车厂商及运营商所推崇。但是LNG相比传统的汽车燃料又具有低温的劣势,在加注以及使用时都存在不易控制的难题。早期的汽车LNG瓶采用自增压方式来输出LNG,即LNG在瓶内气化增大压力将LNG压出,这种方式不仅自升压过程需要时间长,而且压力控制极不方便容易导致供气不足或者供气过量,同时LNG瓶内的残留量往往也较大。LNG (liquefied natural gas) is liquefied natural gas, and its main component is methane. Because LNG has greater energy consumption and environmental protection advantages than gasoline or diesel, it is highly recommended by most automobile manufacturers and operators. However, compared with traditional automobile fuels, LNG has the disadvantage of low temperature, and it is difficult to control when filling and using. Early automobile LNG bottles used the self-pressurization method to output LNG, that is, the LNG was vaporized in the bottle to increase the pressure to press out the LNG. Insufficient gas or excessive gas supply, and the residual amount in the LNG cylinder is often large.
虽然也有文献公开了低温液体泵的相关技术,但是真正要应用于存储温度一般在零下162摄氏度左右的LNG,还是存在回流和压力控制上的难题。Although there are also documents disclosing the related technologies of cryogenic liquid pumps, there are still problems in backflow and pressure control if they are really applied to LNG whose storage temperature is generally around minus 162 degrees Celsius.
实用新型内容Utility model content
实用新型的目的是针对上述问题,提供了一种能够预防燃料回流、压力控制方便的汽车LNG瓶用往复活塞泵。The purpose of the utility model is to address the above problems and provide a reciprocating piston pump for automotive LNG bottles that can prevent fuel backflow and facilitate pressure control.
为达到上述目的,实用新型采用了下列技术方案:一种汽车用液化天然气气瓶的往复活塞泵,包括封闭的泵送腔体以及可在所述的泵送腔体内往复运动的活塞体,该活塞体由液压驱动,在泵送腔体的进液口处由单向阀一封堵,在泵送腔体的出液口处由单向阀二封堵,其中单向阀一和单向阀二的封堵方向相反,所述活塞体朝向进液口运动时打开单向阀二,所述的活塞体反向进液口运动时打开单向阀一。采用了由液压驱动的活塞泵结构,并形成了封闭的泵送腔体,使得泵送腔体内的压力变化取决于活塞体的运动状况,进而使得泵送腔体内压力变得易于控制,从而使得泵送LNG的过程也便于控制。同时由在泵送腔体的进液口和出液口均采用了单向阀来防止液体回流。In order to achieve the above purpose, the utility model adopts the following technical solutions: a reciprocating piston pump for liquefied natural gas cylinders for automobiles, including a closed pumping chamber and a piston body that can reciprocate in the pumping chamber. The piston body is driven by hydraulic pressure, and is blocked by a one-way valve at the liquid inlet of the pumping cavity, and is blocked by a one-way valve two at the liquid outlet of the pumping cavity, wherein the one-way valve one and one-way valve The blocking direction of the valve two is opposite, the one-way valve two is opened when the piston body moves toward the liquid inlet, and the one-way valve one is opened when the piston body moves against the liquid inlet. A piston pump structure driven by hydraulic pressure is adopted, and a closed pumping cavity is formed, so that the pressure change in the pumping cavity depends on the movement of the piston body, which makes the pressure in the pumping cavity easy to control, so that The process of pumping LNG is also easy to control. At the same time, a one-way valve is used at the liquid inlet and the liquid outlet of the pumping cavity to prevent the liquid from flowing back.
作为优选,所述的活塞体朝向进液口运动至顶时,该活塞体占据所述泵送腔体的内部空间至少90%。在活塞体反向进液口运动时,泵送腔体内出现真空空间,活塞体在至顶时占据泵送腔体的内部空间越大,则泵送腔体内的压力与外界的压差可以越大,也更加便于控制。Preferably, when the piston body moves to the top toward the liquid inlet, the piston body occupies at least 90% of the internal space of the pumping cavity. When the piston body moves against the liquid inlet, a vacuum space appears in the pumping chamber. When the piston body reaches the top, the larger the internal space of the pumping chamber is, the greater the pressure difference between the pressure in the pumping chamber and the outside world can be. Larger and easier to control.
作为优选,所述的出液口和所述的泵送腔体之间设有用来输送液体的通道,该通道为L形并容纳液体滞留。由于活塞体的高速运动,所以将输送液体的通道设计为L形滞留空间作为缓冲之用。Preferably, a channel for transporting liquid is provided between the liquid outlet and the pumping cavity, and the channel is L-shaped and accommodates stagnation of liquid. Due to the high-speed movement of the piston body, the channel for conveying liquid is designed as an L-shaped stagnation space for buffering.
作为优选,所述的活塞体采用的材质为钢材,其含铬的重量百分比为20%,含镍的重量百分比为11%。Preferably, the piston body is made of steel, which contains 20% by weight of chromium and 11% by weight of nickel.
作为优选,活塞体头端为迷宫密封结构。Preferably, the head end of the piston body is a labyrinth seal structure.
作为优选,所述的单向阀一包括T字形阀体和阀座,T字形阀体和阀座一之间通过耐低温的弹簧一连接,所述的阀座位于进液通道内,所述的T字形阀体包括圆盖部,该圆盖部位于所述的泵送腔体内并由所述的弹簧一拉向所述进液口并封堵。Preferably, the one-way valve includes a T-shaped valve body and a valve seat, and the T-shaped valve body and the valve seat are connected by a low-temperature-resistant spring, and the valve seat is located in the liquid inlet channel. The T-shaped valve body includes a round cover, which is located in the pumping cavity and is pulled toward the liquid inlet by the spring one and blocked.
作为优选,所述的单向阀二包括球面阀体,该球面阀体连接弹簧二,弹簧二一端固定于出液口外部的通道内并将球面阀体压向所述的出液口,由球面阀体的球面封堵所述的出液口。As a preference, said one-way valve 2 includes a spherical valve body, the spherical valve body is connected to spring 2, and one end of spring 2 is fixed in the channel outside the liquid outlet and presses the spherical valve body to the liquid outlet, The liquid outlet is blocked by the spherical surface of the spherical valve body.
与现有技术相比,实用新型的优点在于:采用液压驱动的活塞泵,实现对于LNG抽取的自动控制,并且设计了封闭的泵送腔体,便于活塞泵在LNG抽取过程中的压力控制,相比自增压方式,抽取LNG之后,LNG瓶内残留小,并且在泵送腔体的进液口和出液口都采用了单向阀设计,不仅保证了泵送腔体的密闭环境还可以防治液体回流。对于单向阀都采用了弹性设计应用,并且针对两个单向阀的不同封堵方向设计了不同的封闭面。Compared with the prior art, the utility model has the advantages of adopting a hydraulically driven piston pump to realize automatic control of LNG extraction, and designing a closed pumping chamber to facilitate the pressure control of the piston pump during LNG extraction. Compared with the self-pressurization method, after extracting LNG, there is less residue in the LNG bottle, and the one-way valve design is adopted at the liquid inlet and outlet of the pumping chamber, which not only ensures the airtight environment of the pumping chamber but also Can prevent liquid backflow. Elastic designs are used for the one-way valves, and different sealing surfaces are designed for different blocking directions of the two one-way valves.
附图说明Description of drawings
为了更清楚地说明实用新型实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是实用新型的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动性的前提下,还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the utility model. For those skilled in the art, other drawings can also be obtained according to these drawings on the premise of not paying creative efforts.
图1为本实用新型的结构示意图;Fig. 1 is the structural representation of the utility model;
图2为本实用新型的封闭腔体部位的放大示意图。Fig. 2 is an enlarged schematic view of the closed cavity of the present invention.
具体实施方式Detailed ways
下面将结合实用新型实施例中的附图,对实用新型实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是实用新型一部分实施例,而不是全部的实施例。基于实用新型中的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例,都属于实用新型保护的范围。The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all embodiments. Based on the embodiments in the utility model, all other embodiments obtained by persons of ordinary skill in the art without creative efforts belong to the protection scope of the utility model.
如图1、2所示,一种汽车用液化天然气气瓶的往复活塞泵,其组成包括了作为动力装置的液压泵1,液压泵通过连杆2连接活塞体3,其中活塞体3在封闭的泵送腔体4内作往复运动,为了防止进入泵送腔体的LNG液体通过活塞体泄漏,活塞体3采用了迷宫密封结构。泵送腔体4的进液口12连通网状的进液头5,该进液头5埋没于LNG瓶内的LNG液面之下。在泵送腔体的进液口12处由单向阀一封堵,在泵送腔体的出液口13处由单向阀二封堵,其中单向阀一和单向阀二的封堵方向相反。As shown in Figures 1 and 2, a reciprocating piston pump for liquefied natural gas cylinders for automobiles includes a hydraulic pump 1 as a power unit, and the hydraulic pump is connected to a piston body 3 through a connecting rod 2, wherein the piston body 3 is closed The pumping cavity 4 is reciprocating. In order to prevent the LNG liquid entering the pumping cavity from leaking through the piston body, the piston body 3 adopts a labyrinth sealing structure. The liquid inlet 12 of the pumping cavity 4 communicates with the netted liquid inlet head 5, and the liquid inlet head 5 is buried under the LNG liquid surface in the LNG bottle. The liquid inlet 12 of the pumping cavity is blocked by a one-way valve, and the liquid outlet 13 of the pumping cavity is blocked by a one-way valve two, wherein the one-way valve one and one-way valve two are sealed. The blocking direction is opposite.
液压泵1驱动活塞体3运动,当所述活塞体朝向进液口运动时打开单向阀二,所述的活塞体反向进液口运动时打开单向阀一。由于采用了液压驱动方式,实现对于LNG液体抽取的自动控制,并且设计了封闭的泵送腔体,使得泵送腔体内的压力变化取决于活塞体的运动状况,进而使得泵送腔体内压力变得易于控制,从而使得泵送LNG液体的过程也便于控制,同时相比自增压方式,在抽取LNG液体之后,LNG瓶内残留小。在泵送腔体的进液口和出液口均采用弹性单向阀来防止LNG液体回流。The hydraulic pump 1 drives the piston body 3 to move. When the piston body moves towards the liquid inlet, the check valve 2 is opened, and when the piston body moves against the liquid inlet, the check valve 1 is opened. Due to the adoption of hydraulic drive mode, the automatic control of LNG liquid pumping is realized, and the closed pumping cavity is designed, so that the pressure change in the pumping cavity depends on the movement of the piston body, which in turn makes the pressure in the pumping cavity change. It is easy to control, so that the process of pumping LNG liquid is also easy to control. At the same time, compared with the self-pressurization method, after the LNG liquid is extracted, the residue in the LNG bottle is small. Elastic one-way valves are used at the liquid inlet and outlet of the pumping chamber to prevent the LNG liquid from flowing back.
由于LNG液体的低温特性,其流动性相对较低,在采用液压驱动的情况下,本实施方式在所述的出液口13和所述的泵送腔体之间设有用来输送液体的通道6,该通道为L形并容纳液体滞留作为缓冲之用。Due to the low-temperature characteristics of LNG liquid, its fluidity is relatively low. In the case of hydraulic drive, this embodiment is provided with a channel for transporting liquid between the liquid outlet 13 and the pumping cavity. 6. The channel is L-shaped and accommodates liquid retention as a buffer.
作为优选,所述的活塞体采用的材质为钢材,其含铬的重量百分比为20%,含镍的重量百分比为11%。活塞体式本实用新型的重要部件,为了适应LNG液体的特性,对活塞体材质进行优化设计,主要是增加了铬和镍的含量,其中增加铬来增大抗腐蚀性,增大镍来增大抗低温性,经过多次试验,采用本实施例中的钢材材质,活塞体可以至少正常使用十年。Preferably, the piston body is made of steel, which contains 20% by weight of chromium and 11% by weight of nickel. Piston body type The important parts of this utility model, in order to adapt to the characteristics of LNG liquid, optimize the design of the piston body material, mainly to increase the content of chromium and nickel, in which chromium is added to increase corrosion resistance, and nickel is increased to increase corrosion resistance. Low temperature resistance, after several tests, the steel material in this embodiment is used, and the piston body can be used normally for at least ten years.
作为单向阀一的一种优选实施方式,参加图2,所述的单向阀一包括T字形阀体7和阀座9,T字形阀体和阀座一之间通过耐低温的弹簧一10连接,所述的阀座9位于进液通道内,所述的T字形阀体包括圆盖部71,该圆盖部71位于所述的泵送腔体4内并由所述的弹簧一10拉向所述进液口12并封堵。当活塞体3朝向进液口运动时,泵送腔体4内的压力增大,所述的圆盖部71保持与进液口之间的密封关系,当活塞体3反向进液口运动时,泵送腔体4内的压力减小,在压差作用下,所述的弹簧一10被压缩,所述的圆盖部71保持与进液口之间不在密封,单向阀一打开。As a preferred embodiment of the one-way valve, refer to FIG. 2, the one-way valve includes a T-shaped valve body 7 and a valve seat 9, and a low-temperature-resistant spring passes between the T-shaped valve body and the valve seat. 10 connection, the valve seat 9 is located in the liquid inlet channel, the T-shaped valve body includes a round cover part 71, the round cover part 71 is located in the pumping cavity 4 and is supported by the spring one 10 is pulled toward the liquid inlet 12 and blocked. When the piston body 3 moves towards the liquid inlet, the pressure in the pumping chamber 4 increases, and the dome 71 maintains a sealing relationship with the liquid inlet, and when the piston body 3 moves against the liquid inlet , the pressure in the pumping cavity 4 decreases, and under the action of the pressure difference, the spring 10 is compressed, and the dome 71 is not sealed with the liquid inlet, and the one-way valve is opened .
作为单向阀二的一种优选实施方式,参加图2,所述的单向阀二包括球面阀体8,该球面阀体连接弹簧二11,弹簧二11一端固定于出液口外部的通道内并将球面阀体压向所述的出液口,由球面阀体8的球面封堵所述的出液口。当活塞体3反向进液口运动时,泵送腔体4内的压力减小,在压差以及所述的弹簧一11作用下,球面阀体8的球面和出液口13保持密封。当活塞体3朝向进液口运动时,泵送腔体4内的压力增大,所示的弹簧二11被压缩,所述的球面阀体8的球面和出液口之间不再密封,LNG液体从出液口泵出。As a preferred embodiment of the check valve 2, refer to Fig. 2, the check valve 2 includes a spherical valve body 8, the spherical valve body is connected to a spring 2 11, and one end of the spring 2 11 is fixed to the channel outside the liquid outlet and press the spherical valve body to the liquid outlet, and the spherical surface of the spherical valve body 8 blocks the liquid outlet. When the piston body 3 moves against the liquid inlet, the pressure in the pumping cavity 4 decreases, and under the action of the pressure difference and the spring 11, the spherical surface of the spherical valve body 8 and the liquid outlet 13 remain sealed. When the piston body 3 moves towards the liquid inlet, the pressure in the pumping chamber 4 increases, the spring 2 11 shown is compressed, and the spherical surface of the spherical valve body 8 and the liquid outlet are no longer sealed, LNG liquid is pumped out from the liquid outlet.
以上所述仅为实用新型的较佳实施例而已,并不用以限制实用新型,凡在实用新型的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在实用新型的保护范围之内。The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the utility model shall be included in the utility model. within the scope of protection.
Claims (7)
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104929887A (en) * | 2015-07-02 | 2015-09-23 | 杭州富士达特种材料有限公司 | Reciprocating piston pump of liquefied natural gas cylinder for automobile |
CN110185598A (en) * | 2019-06-24 | 2019-08-30 | 山东奥扬新能源科技股份有限公司 | Booster pump built in a kind of automobile-used cryogenic natural gas bottle |
-
2015
- 2015-07-02 CN CN201520465019.3U patent/CN204738920U/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104929887A (en) * | 2015-07-02 | 2015-09-23 | 杭州富士达特种材料有限公司 | Reciprocating piston pump of liquefied natural gas cylinder for automobile |
CN110185598A (en) * | 2019-06-24 | 2019-08-30 | 山东奥扬新能源科技股份有限公司 | Booster pump built in a kind of automobile-used cryogenic natural gas bottle |
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Effective date of registration: 20160504 Address after: 419, room 699, block B, Meilin Road, Tonglu Economic Development Zone, Tonglu County, Hangzhou, Zhejiang, 311500 Patentee after: HANGZHOU WEST PORT LOW TEMPERATURE TECHNOLOGY CO., LTD. Address before: 516, room 699, block B, Meilin Road, Tonglu Economic Development Zone, Hangzhou, Zhejiang, 311500, China Patentee before: Hangzhou Fushida Special Material Co.,Ltd. |