RECIPROCATION PISTON PUMP

• Main Author: NAKANISHI TOSHIAKI
• Format: Patent
• Language: English; Japanese
• Published: 22.03.2019
• Subjects: BLASTING; HEATING; LIGHTING; MECHANICAL ENGINEERING; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; WEAPONS

To improve the durability of a pump by suppressing the wear of a packing.SOLUTION: A packing 21a which is accommodated in and held to an annular recessed groove 21f at an external peripheral side of a water absorption valve seat 21b, slide-contacts with an internal peripheral face of a cylinder pipe 3, and is composed of an elastic body is slightly worn when operated by using a use liquid containing impurities. Then, a valve seat rear part 21e out of the water absorption valve seat 21b located at a rear side of the package 21a, and having a minute clearance S between the cylinder pipe 3 and itself contacts with an inner face of the cylinder pipe 3. Since the water absorption valve seat 21b is constituted of resin, even if the valve seat contacts with the cylinder pipe 3, the valve seat hardly scratch the cylinder pipe 3, and can suppress the wear of the packing 21a. In addition to this, the water absorption valve seat 21b contacting with the cylinder pipe 3 stops the larger wear (not smaller than the minute clearance) of the packing 21a, and plays a role of the backup of the packing 21a.SELECTED DRAWING: Figure 2 【課題】パッキンの摩耗を抑えポンプの耐久性を向上する。【解決手段】吸水弁座２１ｂの外周側の円環状の凹溝２１ｆに収容保持されシリンダパイプ３内周面に摺接する弾性体より成るパッキン２１ａは、不純物を含む使用液を用いて運転した場合に多少摩耗する。すると、吸水弁座２１ｂのうち、パッキン２１ａの後側に位置しシリンダパイプ３との間に微小隙間Ｓを有する弁座後部２１ｅが、シリンダパイプ３の内面に接触することになる。吸水弁座２１ｂは樹脂より構成されているため、シリンダパイプ３と接触してもシリンダパイプ３に傷を殆ど付けることがなくパッキン２１ａの摩耗を抑制できる上に、シリンダパイプ３に接触した吸水弁座２１ｂがパッキン２１ａのそれ以上（微小隙間以上）の摩耗を止め、パッキン２１ａのバックアップの役割を果たす。【選択図】図２