出售GR40SMT16B100LRF2合山机电设备配套立式螺杆泵

黄山亦百诺泵业有限公司供应国产及进口螺杆泵所有部件：
供应GR40SMT16B100LRF2三螺杆泵泵头、泵头座、单机、机组、整机、衬套、泵芯、轴承、联轴器、机械密封、泵体或泵壳、底座、支架、柱脚、主、从螺杆或螺杆轴、备件、组件、部件、配件、零部件、平键、前端盖、后端盖、安全阀等
备注：
1、客户购买泵头、泵头座，需告知厂方螺杆泵型号或者泵铭牌图片。
2、客户购买单机、机组、整机，需告知厂方螺杆泵型号及其配套电机功率。
3、客户购买备件、组件、部件、配件、零部件等，需告知厂方螺杆泵型号。
4、常规型号螺杆泵及其备件等都有现货，非标螺杆泵或者进口螺杆泵等需要10-15天货期。

我们生产及销售各种螺杆泵及其配件，并且我厂维修各国进口螺杆泵，包括进口螺杆泵的定做业务等，我们的联系方式如下，欢迎前来咨询，您的满意是我们前进的最大动力。

出售GR40SMT16B100LRF2合山机电设备配套立式螺杆泵

螺杆泵机械密封技术要求：
密封环是动环和静环的总称(下同)，是构成机械密封最主要的元件。密封环在很大程度上决定了机械密封的使用性能和寿命，因此，对它提出了一些要求。
1、有足够的强度和刚度
在工作条件下(如压力、温度和滑动速度等)不损坏，变形应尽量的小，工作条件波动时仍能保持密封性。尤其是密封端面要有足够的强度以及一定的耐腐蚀能力，以保证产品有满意的使用寿命。
2、有良好的耐热冲击能力
为此，要求材料有较高的导热系数和较小的线膨胀系数，承受热冲击时不至于开裂。
3、较小的摩擦系数
密封环匹配应有较小的摩擦系数。
4、良好的自润滑性
工作中如发生短时间的干摩擦，不损伤密封端面。因此，密封环要有良好的自润滑性，密封环材料与密封流体还要有很好的浸润性。
5、结构简单
密封环结构应力求简单对称，优先考虑用整体型结构，也可采用组合式(如镶装式)密封环，尽量避免用密封端面喷涂式结构。
6、密封环要容易加工制造
安装和维修要方便，价格要低廉。

GR20螺杆泵型号
GR20SMT16B8LRF2
GR20SMT16B12LRF2
GR20SMT16B15LRF2
GR20SMT16B20LRF2
GR20SMT16B8LAC9/B14HATM                GR20SMT16B12LAC9/B14HATM
GR20SMT16B15LAC9/B14HATM               GR20SMT16B20LAC9/B14HATM
GR20SMT16B8LS1AC9/B14GHATMVRF1AX       GR20SMT16B12LS1AC9/B14GHATMVRF1AX        GR20SMT16B15LS1AC9/B14GHATMVRF1AX      GR20SMT16B20LS1AC9/B14GHATMVRF1AX
GR20SMIT16B8LAC11/B5HATM               GR20SMIT16B12LAC11/B5HATM
GR20SMIT16B15LAC11/B5HATM              GR20SMIT16B20LAC11/B5HATM
GR20SMIT16B8LS1AC11/B5GHATMVRF1AX      GR20SMIT16B12LS1AC11/B5GHATMVRF1AX       GR20SMIT16B15LS1AC11/B5GHATMVRF1AX     GR20SMIT16B20LS1AC11/B5GHATMVRF1AX
GR20SMT16B8LAC11/B5HATM                GR20SMT16B12LAC11/B5HATM
GR20SMT16B15LAC11/B5HATM               GR20SMT16B20LAC11/B5HATM
GR20SMT16B8LS1AC11/B5GHATMVRF1AX       GR20SMT16B12LS1AC11/B5GHATMVRF1AX        GR20SMT16B15LS1AC11/B5GHATMVRF1AX      GR20SMT16B20LS1AC11/B5GHATMVRF1AX
GR20SMIT16B8LAC11/B5HATM               GR20SMIT16B12LAC11/B5HATM
GR20SMIT16B15LAC11/B5HATM              GR20SMIT16B20LAC11/B5HATM
GR20SMIT16B8LS1AC11/B5GHATMVRF1AX      GR20SMIT16B12LS1AC11/B5GHATMVRF1AX       GR20SMIT16B15LS1AC11/B5GHATMVRF1AX     GR20SMIT16B20LS1AC11/B5GHATMVRF1AX
GR20SMT16B8LAC14/B5HATM                GR20SMT16B12LAC14/B5HATM
GR20SMT16B15LAC14/B5HATM               GR20SMT16B20LAC14/B5HATM
GR20SMT16B8LS1AC14/B5GHATMVRF1AX       GR20SMT16B12LS1AC14/B5GHATMVRF1AX        GR20SMT16B15LS1AC14/B5GHATMVRF1AX      GR20SMT16B20LS1AC14/B5GHATMVRF1AX
GR20SMIT16B8LAC14/B5HATM               GR20SMIT16B12LAC14/B5HATM
GR20SMIT16B15LAC14/B5HATM              GR20SMIT16B20LAC14/B5HATM
GR20SMIT16B8LS1AC14/B5GHATMVRF1AX      GR20SMIT16B12LS1AC14/B5GHATMVRF1AX       GR20SMIT16B15LS1AC14/B5GHATMVRF1AX     GR20SMIT16B20LS1AC14/B5GHATMVRF1AX
GR20SMT16B8LAC14/B14HATM               GR20SMT16B12LAC14/B14HATM
GR20SMT16B15LAC14/B14HATM              GR20SMT16B20LAC14/B14HATM
GR20SMT16B8LS1AC14/B14GHATMVRF1AX      GR20SMT16B12LS1AC14/B14GHATMVRF1AX       GR20SMT16B15LS1AC14/B14GHATMVRF1AX     GR20SMT16B20LS1AC14/B14GHATMVRF1AX
GR20SMIT16B8LAC14/B14HATM              GR20SMIT16B12LAC14/B14HATM
GR20SMIT16B15LAC14/B14HATM             GR20SMIT16B20LAC14/B14HATM
GR20SMIT16B8LS1AC14/B14GHATMVRF1AX     GR20SMIT16B12LS1AC14/B14GHATMVRF1AX      GR20SMIT16B15LS1AC14/B14GHATMVRF1AX    GR20SMIT16B20LS1AC14/B14GHATMVRF1AX
GR20SMT16B8LAC19/B14HATM               GR20SMT16B12LAC19/B14HATM
GR20SMT16B15LAC19/B14HATM              GR20SMT16B20LAC19/B14HATM
GR20SMT16B8LS1AC19/B14GHATMVRF1AX      GR20SMT16B12LS1AC19/B14GHATMVRF1AX       GR20SMT16B15LS1AC19/B14GHATMVRF1AX     GR20SMT16B20LS1AC19/B14GHATMVRF1AX
GR20SMIT16B8LAC19/B14HATM              GR20SMIT16B12LAC19/B14HATM
GR20SMIT16B15LAC19/B14HATM             GR20SMIT16B20LAC19/B14HATM
GR20SMIT16B8LS1AC19/B14GHATMVRF1AX     GR20SMIT16B12LS1AC19/B14GHATMVRF1AX       GR20SMIT16B15LS1AC19/B14GHATMVRF1AX    GR20SMIT16B20LS1AC19/B14GHATMVRF1AX
GR20SMT16B8LAC19/B5HATM                GR20SMT16B12LAC19/B5HATM
GR20SMT16B15LAC19/B5HATM               GR20SMT16B20LAC19/B5HATM
GR20SMT16B8LS1AC19/B5GHATMVRF1AX       GR20SMT16B12LS1AC19/B5GHATMVRF1AX         GR20SMT16B15LS1AC19/B5GHATMVRF1AX      GR20SMT16B20LS1AC19/B5GHATMVRF1AX
GR20SMIT16B8LAC19/B5HATM               GR20SMIT16B12LAC19/B5HATM
GR20SMIT16B15LAC19/B5HATM              GR20SMIT16B20LAC19/B5HATM
GR20SMIT16B8LS1AC19/B5GHATMVRF1AX      GR20SMIT16B12LS1AC19/B5GHATMVRF1AX        GR20SMIT16B15LS1AC19/B5GHATMVRF1AX     GR20SMIT16B20LS1AC19/B5GHATMVRF1AX



GR25螺杆泵型号
GR25SMT16B25LRF2
GR25SMT16B30LRF2
GR25SMT16B25LAC14/B14HATM              GR25SMT16B30LAC14/B14HATM
GR25SMT16B25LAC19/B14HATM              GR25SMT16B30LAC19/B14HATM
GR25SMT16B25LAC14/B5HATM               GR25SMT16B30LAC14/B5HATM
GR25SMT16B25LAC19/B5HATM               GR25SMT16B30LAC19/B5HATM
GR20SMT16B25LS1AC14/B14GHATMVRF1AX     GR20SMT16B30LS1AC14/B14GHATMVRF1AX
GR20SMT16B25LS1AC19/B14GHATMVRF1AX     GR20SMT16B30LS1AC19/B14GHATMVRF1AX
GR20SMT16B25LS1AC14/B5GHATMVRF1AX      GR20SMT16B30LS1AC14/B5GHATMVRF1AX
GR20SMT16B25LS1AC19/B5GHATMVRF1AX      GR20SMT16B30LS1AC19/B5GHATMVRF1AX
GR20SMIT16B25LAC14/B14HATM             GR20SMIT16B30LAC14/B14HATM
GR20SMIT16B25LAC19/B14HATM             GR20SMIT16B30LAC19/B14HATM
GR20SMIT16B25LAC14/B5HATM              GR20SMIT16B30LAC14/B5HATM
GR20SMIT16B25LAC19/B5HATM              GR20SMIT16B30LAC19/B5HATM
GR20SMIT16B25LS1AC14/B14GHATMVRF1AX    GR20SMIT16B30LS1AC14/B14GHATMVRF1AX
GR20SMIT16B25LS1AC19/B14GHATMVRF1AX    GR20SMIT16B30LS1AC19/B14GHATMVRF1AX
GR20SMIT16B25LS1AC14/B5GHATMVRF1AX     GR20SMIT16B30LS1AC14/B5GHATMVRF1AX
GR20SMIT16B25LS1AC19/B5GHATMVRF1AX     GR20SMIT16B30LS1AC19/B5GHATMVRF1AX



GR32螺杆泵型号
GR32SMT16B35LRF2
GR32SMT16B45LRF2
GR32SMT16B55LRF2
GR32SMT16B75LRF2
GR32SMT16B35LAC19/B14HATM              GR32SMT16B45LAC19/B14HATM
GR32SMT16B55LAC19/B14HATM              GR32SMT16B75LAC19/B14HATM
GR32SMT16B35LAC19/B5HATM               GR32SMT16B45LAC19/B5HATM
GR32SMT16B55LAC19/B5HATM               GR32SMT16B75LAC19/B5HATM
GR32SMT16B35LAC24/B5HATM               GR32SMT16B45LAC24/B5HATM
GR32SMT16B55LAC24/B5HATM               GR32SMT16B75LAC24/B5HATM
GR32SMT16B35LS1AC19/B14GHATMVRF1AX     GR32SMT16B45LS1AC19/B14GHATMVRF1AX    GR32SMT16B55LS1AC19/B14GHATMVRF1AX     GR32SMT16B75LS1AC19/B14GHATMVRF1AX
GR32SMT16B35LS1AC19/B5GHATMVRF1AX      GR32SMT16B45LS1AC19/B5GHATMVRF1AX     GR32SMT16B55LS1AC19/B5GHATMVRF1AX      GR32SMT16B75LS1AC19/B5GHATMVRF1AX
GR32SMT16B35LS1AC24/B5GHATMVRF1AX      GR32SMT16B45LS1AC24/B5GHATMVRF1AX     GR32SMT16B55LS1AC24/B5GHATMVRF1AX      GR32SMT16B75LS1AC24/B5GHATMVRF1AX
GR32SMIT16B35LAC19/B14HATM             GR32SMIT16B45LAC19/B14HATM
GR32SMIT16B55LAC19/B14HATM             GR32SMIT16B75LAC19/B14HATM
GR32SMIT16B35LAC19/B5HATM              GR32SMIT16B45LAC19/B5HATM
GR32SMIT16B55LAC19/B5HATM              GR32SMIT16B75LAC19/B5HATM
GR32SMIT16B35LAC24/B5HATM              GR32SMIT16B45LAC24/B5HATM
GR32SMIT16B55LAC24/B5HATM              GR32SMIT16B75LAC24/B5HATM
GR32SMIT16B35LS1AC19/B14GHATMVRF1AX    GR32SMIT16B45LS1AC19/B14GHATMVRF1AX    GR32SMIT16B55LS1AC19/B14GHATMVRF1AX    GR32SMIT16B75LS1AC19/B14GHATMVRF1AX
GR32SMIT16B35LS1AC19/B5GHATMVRF1AX     GR32SMIT16B45LS1AC19/B5GHATMVRF1AX     GR32SMIT16B55LS1AC19/B5GHATMVRF1AX     GR32SMIT16B75LS1AC19/B5GHATMVRF1AX
GR32SMIT16B35LS1AC24/B5GHATMVRF1AX     GR32SMIT16B45LS1AC24/B5GHATMVRF1AX     GR32SMIT16B55LS1AC24/B5GHATMVRF1AX     GR32SMIT16B75LS1AC24/B5GHATMVRF1AX



GR40螺杆泵型号
GR40SMT16B100LRF2
GR40SMT16B125LRF2
GR40SMT16B150LRF2
GR40SMT16B80LAC19/B5HATM               GR40SMT16B100LAC19/B5HATM
GR40SMT16B125LAC19/B5HATM              GR40SMT16B150LAC19/B5HATM
GR40SMT16B80LAC24/B14HATM              GR40SMT16B100LAC24/B14HATM
GR40SMT16B125LAC24/B14HATM             GR40SMT16B150LAC24/B14HATM
GR40SMT16B80LAC24/B5HATM               GR40SMT16B100LAC24/B5HATM
GR40SMT16B125LAC24/B5HATM              GR40SMT16B150LAC24/B5HATM
GR40SMT16B80LAC28/B14HATM              GR40SMT16B100LAC28/B14HATM
GR40SMT16B125LAC28/B14HATM             GR40SMT16B150LAC28/B14HATM
GR40SMT16B80LAC28/B5HATM               GR40SMT16B100LAC28/B5HATM
GR40SMT16B125LAC28/B5HATM              GR40SMT16B150LAC28/B5HATM
GR40SMT16B80LS1AC19/B5GHATMVRF1AX      GR40SMT16B100LS1AC19/B5GHATMVRF1AX     GR40SMT16B125LS1AC19/B5GHATMVRF1AX     GR40SMT16B150LS1AC19/B5GHATMVRF1AX
GR40SMT16B80LS1AC24/B14GHATMVRF1AX     GR40SMT16B100LS1AC24/B14GHATMVRF1AX    GR40SMT16B125LS1AC24/B14GHATMVRF1AX    GR40SMT16B150LS1AC24/B14GHATMVRF1AX
GR40SMT16B80LS1AC24/B5GHATMVRF1AX      GR40SMT16B100LS1AC24/B5GHATMVRF1AX     GR40SMT16B125LS1AC24/B5GHATMVRF1AX     GR40SMT16B150LS1AC24/B5GHATMVRF1AX
GR40SMT16B80LS1AC28/B14GHATMVRF1AX     GR40SMT16B100LS1AC28/B14GHATMVRF1AX    GR40SMT16B125LS1AC28/B14GHATMVRF1AX    GR40SMT16B150LS1AC28/B14GHATMVRF1AX
GR40SMT16B80LS1AC28/B5GHATMVRF1AX      GR40SMT16B100LS1AC28/B5GHATMVRF1AX     GR40SMT16B125LS1AC28/B5GHATMVRF1AX     GR40SMT16B150LS1AC28/B5GHATMVRF1AX
GR40SMIT16B80LAC19/B5HATM              GR40SMIT16B100LAC19/B5HATM
GR40SMIT16B125LAC19/B5HATM             GR40SMIT16B150LAC19/B5HATM
GR40SMIT16B80LAC24/B14HATM             GR40SMIT16B100LAC24/B14HATM
GR40SMIT16B125LAC24/B14HATM            GR40SMIT16B150LAC24/B14HATM
GR40SMIT16B80LAC24/B5HATM              GR40SMIT16B100LAC24/B5HATM
GR40SMIT16B125LAC24/B5HATM             GR40SMIT16B150LAC24/B5HATM
GR40SMIT16B80LAC28/B14HATM             GR40SMIT16B100LAC28/B14HATM
GR40SMIT16B125LAC28/B14HATM            GR40SMIT16B150LAC28/B14HATM
GR40SMIT16B80LAC28/B5HATM              GR40SMIT16B100LAC28/B5HATM
GR40SMIT16B125LAC28/B5HATM             GR40SMIT16B150LAC28/B5HATM
GR40SMIT16B80LS1AC19/B5GHATMVRF1AX     GR40SMIT16B100LS1AC19/B5GHATMVRF1AX     GR40SMIT16B125LS1AC19/B5GHATMVRF1AX    GR40SMIT16B150LS1AC19/B5GHATMVRF1AX
GR40SMIT16B80LS1AC24/B14GHATMVRF1AX    GR40SMIT16B100LS1AC24/B14GHATMVRF1AX    GR40SMIT16B125LS1AC24/B14GHATMVRF1AX   GR40SMIT16B150LS1AC24/B14GHATMVRF1AX
GR40SMIT16B80LS1AC24/B5GHATMVRF1AX     GR40SMIT16B100LS1AC24/B5GHATMVRF1AX     GR40SMIT16B125LS1AC24/B5GHATMVRF1AX    GR40SMIT16B150LS1AC24/B5GHATMVRF1AX
GR40SMIT16B80LS1AC28/B14GHATMVRF1AX    GR40SMIT16B100LS1AC28/B14GHATMVRF1AX    GR40SMIT16B125LS1AC28/B14GHATMVRF1AX   GR40SMIT16B150LS1AC28/B14GHATMVRF1AX
GR40SMIT16B80LS1AC28/B5GHATMVRF1AX     GR40SMIT16B100LS1AC28/B5GHATMVRF1AX     GR40SMIT16B125LS1AC28/B5GHATMVRF1AX    GR40SMIT16B150LS1AC28/B5GHATMVRF1AX



GR45螺杆泵型号
GR45SMT16B180LRF2
GR45SMT16B210LRF2
GR45SMT16B180LAC28/B5HATM                GR45SMT16B210LAC28/B5HATM
GR45SMT16B180LAC38/B5HATM                GR45SMT16B210LAC38/B5HATM
GR45SMT16B180LS1AC28/B5GHATMVRF1AX       GR45SMT16B210LS1AC28/B5GHATMVRF1AX
GR45SMT16B180LS1AC38/B5GHATMVRF1AX       GR45SMT16B210LS1AC38/B5GHATMVRF1AX
GR45SMIT16B180LAC28/B5HATM               GR45SMIT16B210LAC28/B5HATM
GR45SMIT16B180LAC38/B5HATM               GR45SMIT16B210LAC38/B5HATM
GR45SMIT16B180LS1AC28/B5GHATMVRF1AX      GR45SMIT16B210LS1AC28/B5GHATMVRF1AX
GR45SMIT16B180LS1AC38/B5GHATMVRF1AX      GR45SMIT16B210LS1AC38/B5GHATMVRF1AX



GR55螺杆泵型号
GR55SMT16B250LRF2
GR55SMT16B300LRF2
GR55SMT16B330LRF2
GR55SMT16B380LRF2
GR55SMT16B250LAC28/B5HATM             GR55SMT16B300LAC28/B5HATM              GR55SMT16B330LAC28/B5HATM             GR55SMT16B380LAC28/B5HATM
GR55SMT16B250LAC38/B5HATM             GR55SMT16B300LAC38/B5HATM              GR55SMT16B330LAC38/B5HATM             GR55SMT16B380LAC38/B5HATM
GR55SMT16B250LS1AC28/B5GHATMVRF1AX    GR55SMT16B300LS1AC28/B5GHATMVRF1AX     GR55SMT16B330LS1AC28/B5GHATMVRF1AX    GR55SMT16B380LS1AC28/B5GHATMVRF1AX
GR55SMT16B250LS1AC38/B5GHATMVRF1AX    GR55SMT16B300LS1AC38/B5GHATMVRF1AX     GR55SMT16B330LS1AC38/B5GHATMVRF1AX    GR55SMT16B380LS1AC38/B5GHATMVRF1AX
GR55SMIT16B250LAC28/B5HATM            GR55SMIT16B300LAC28/B5HATM             GR55SMIT16B330LAC28/B5HATM            GR55SMIT16B380LAC28/B5HATM
GR55SMIT16B250LAC38/B5HATM            GR55SMIT16B300LAC38/B5HATM             GR55SMIT16B330LAC38/B5HATM            GR55SMIT16B380LAC38/B5HATM
GR55SMIT16B250LS1AC28/B5GHATMVRF1AX   GR55SMIT16B300LS1AC28/B5GHATMVRF1AX    GR55SMIT16B330LS1AC28/B5GHATMVRF1AX   GR55SMIT16B380LS1AC28/B5GHATMVRF1AX
GR55SMIT16B250LS1AC38/B5GHATMVRF1AX   GR55SMIT16B300LS1AC38/B5GHATMVRF1AX    GR55SMIT16B330LS1AC38/B5GHATMVRF1AX   GR55SMIT16B380LS1AC38/B5GHATMVRF1AX



GR60螺杆泵型号
GR60SMT16B440LRF2
GR60SMT16B500LRF2
GR60SMT16B440LAC28/B5HATM                GR60SMT16B500LAC28/B5HATM
GR60SMT16B440LAC38/B5HATM                GR60SMT16B500LAC38/B5HATM
GR60SMT16B440LS1AC28/B5GHATMVRF1AX       GR60SMT16B500LS1AC28/B5GHATMVRF1AX
GR60SMT16B440LS1AC38/B5GHATMVRF1AX       GR60SMT16B500LS1AC38/B5GHATMVRF1AX
GR60SMIT16B440LAC28/B5HATM               GR60SMIT16B500LAC28/B5HATM
GR60SMIT16B440LAC38/B5HATM               GR60SMIT16B500LAC38/B5HATM
GR60SMIT16B440LS1AC28/B5GHATMVRF1AX      GR60SMIT16B500LS1AC28/B5GHATMVRF1AX
GR60SMIT16B440LS1AC38/B5GHATMVRF1AX      GR60SMIT16B500LS1AC38/B5GHATMVRF1AX



GR70螺杆泵型号
GR70SMT16B600LRF2
GR70SMT16B660LRF2
GR70SMT16B800LRF2
GR70SMT16B600LAC28/B5HATM               GR70SMT16B660LAC28/B5HATM             GR70SMT16B800LAC28/B5HATM
GR70SMT16B600LAC38/B5HATM               GR70SMT16B660LAC38/B5HATM             GR70SMT16B800LAC38/B5HATM
GR70SMT16B600LS1AC28/B5GHATMVRF1AX      GR70SMT16B660LS1AC28/B5GHATMVRF1AX    GR70SMT16B800LS1AC28/B5GHATMVRF1AX
GR70SMT16B600LS1AC38/B5GHATMVRF1AX      GR70SMT16B660LS1AC38/B5GHATMVRF1AX    GR70SMT16B800LS1AC38/B5GHATMVRF1AX
GR70SMIT16B600LAC28/B5HATM              GR70SMIT16B660LAC28/B5HATM            GR70SMIT16B800LAC28/B5HATM
GR70SMIT16B600LAC38/B5HATM              GR70SMIT16B660LAC38/B5HATM            GR70SMIT16B800LAC38/B5HATM
GR70SMIT16B600LS1AC28/B5GHATMVRF1AX     GR70SMIT16B660LS1AC28/B5GHATMVRF1AX   GR70SMIT16B800LS1AC28/B5GHATMVRF1AX
GR70SMIT16B600LS1AC38/B5GHATMVRF1AX     GR70SMIT16B660LS1AC38/B5GHATMVRF1AX   GR70SMIT16B800LS1AC38/B5GHATM



GR80SMT16B
GR80SMT16B1000LRF2
GR80SMT16B1200LRF2



GR90SMT16B
GR90SMT16B1500LRF2
GR90SMT16B1700LRF2
GR90SMT16B2000LRF2
GR90SMT16B2200LRF2
GR90SMT16B1700LS2AX



GR110SMT16B
GR110SMT16B2300LRF2
GR110SMT16B2500LRF2
GR110SMT16B2800LRF2
GR110SMT16B3200LRF2


GR130SMT16B
GR130SMT16B3300LRF2
GR130SMT16B3800LRF2

出售GR40SMT16B100LRF2合山机电设备配套立式螺杆泵