JP3011986U - Impeller and pump structure - Google Patents

Abstract

(57) [Summary] In the structure of the pump consisting of casing and impeller,
Improved combination of the blade and casing enables high pressure discharge. [Composition] A front reservoir chamber and an impeller chamber are formed in a casing, the impeller has a high suction port and a low seat surface toward the casing flow path, and a blade space portion formed by each blade is shaped into a substantially water drop shape. . With this structure, a large amount of liquid having a high pressure can be ejected, which serves to prevent the reverse amount of liquid.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of an impeller and a pump having an improved flow passage, and more specifically, to an improvement of a pump structure in which a vane portion and a casing are improved and combined to enable high-pressure discharge.

[0002]

[Prior art]

 Various types of pumps that require high-pressure discharge, such as those used for cleaning or discharging water, have been developed in the past.The typical pump and impeller structures are among them. Higher pressure is obtained by increasing the blades, increasing the absolute flow rate by increasing the size of the blades, or using a multi-stage pump structure in which multiple impellers are arranged and pressure is added by each impeller.

[0003]

[Problems to be solved by the device]

 However, the blade shape itself has not yet been improved to realize efficient high-pressure discharge. In other words, the former impeller high-rotation type requires a blade shape with high accuracy and low rotational resistance in order to rotate at high speed, but with the conventional blade shape, the rotational resistance cannot be reduced more than a certain amount and about 10,000 rpm The driving force associated with rotating it requires a large amount of energy. In addition, the heat generated in the bearing due to high-speed rotation is at a level that cannot be ignored, and effective cooling means are also required to improve durability.

Next, in a large pump structure that increases the absolute flow rate by increasing the size and diameter of the impeller blades, a large load is applied to the drive unit and the impeller also has a large rotational load, so the size of the pump is naturally increased. However, it is not possible to obtain a large discharge rate at the high pressure that is expected.

Further, in the latter case of the multi-stage pump structure in which a plurality of impellers are arranged to increase the discharge pressure, a complicated pump structure is first of all mentioned, which greatly increases the manufacturing cost, and the performance is suitable for the purpose. Moreover, in order to obtain a total lift curve, the machining shape of each blade has to be changed to deal with various demands, and the complexity remains. In view of these drawbacks, the present invention aims to provide a pump structure that improves the pump casing, the flow path, and the impeller to enable a large amount of discharge at a high pressure.

[0006]

[Means for Solving the Problems]

 The present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, a blade portion (21) that spirally connects a front end facing a suction port (3) and a rear end facing a casing flow path (4). A structure of an impeller (2) rotatably provided in a pump casing (1) having a plurality of pumps, and a partition plate (5) in which a suction port (3) is opened in the casing (1) of the pump. ) Is provided to provide the front reservoir chamber (6) and the impeller chamber (7), and the impeller (2) has a high seat near the suction port (3) and a low seat toward the casing flow path (4). The blade part (21) has a surface, and the tip part (22) of the blade part (21) is directed toward the center, and the terminal end part (23) connected to the leading end part (22) is disposed near the other blade part rear surface (24). By the way, the blade space part (25) composed of each blade part (21) is shaped like a water drop. It is characterized.

Further, as shown in FIGS. 1 and 2, the pump casing has a plurality of blade portions (21) that spirally connect the tip end facing the suction port (3) and the end end facing the casing flow path (4). A structure of an impeller (2) and a pump rotatably provided in the ring (1), wherein the pump casing (1) has a bearing chamber (8) and a partition plate (5) in which a suction port (3) is opened. ), A front reservoir chamber (6) and an impeller chamber (7). The impeller (2) has a high seat near the suction port (3) and a low seat toward the casing flow path (4). With the surface, the tip portion (22) of the blade portion (21) is directed toward the center, and the terminal end portion (23) is arranged close to the other blade portion rear surface (24), and the impeller chamber (7) is arranged. A hole (9) for communicating between the bearing chamber (8) and the bearing chamber (8) is formed, and the bearing chamber (8) is formed. A bypass flow path (10) is provided from the to the casing flow path (4).

Further, as shown in FIGS. 1 and 3, the pump casing has a plurality of blade portions (21) that spirally connect the tip end facing the suction port (3) and the end end facing the casing flow path (4). A structure of an impeller and a pump rotatably provided in the ring (1), wherein the pump casing (1) has a drive chamber (12) in which an electric motor (11) is installed and a suction port (3). It consists of a front pool chamber (6) and an impeller chamber (7) divided by a partition plate (5), and the impeller (2) is high near the suction port (3) and is directed toward the casing flow path (4). And a lower seating surface, the tip end (22) of the blade (21) is directed toward the center, and the terminal end (23) is arranged closer to the other blade rear surface (24). A hole (9) for connecting the flow path (13) of the drive chamber (12) with the (7) 2) is formed, and a bypass channel (10) is provided from the channel (13) of the drive chamber (12) to the casing channel (4).

[0009]

[Action]

 The present invention has the following advantages due to the above structure. That is, in the impeller (2) of the present invention, as shown in FIG. 1, FIG. 2, and FIG. 3, the blade space portion (25) composed of each blade portion (21) is formed into a substantially water drop shape, and suction is performed. The seat near the mouth (3) is high and has a low seating surface toward the casing flow path (4), which has an extremely wide pocket when viewed from the top and a narrow discharge port, while it is viewed from the side. Since the seat surface is a space that gradually expands toward the discharge port, a large effective suction area is secured for the suction port (3), enabling quick suction, and the sucked liquid is directed toward the discharge port. The gradually expanding space forms a smooth flow path to increase the flow velocity, and the sandwiched portion formed by the end portion (23) and the other blade rear surface (24) further increases the flow velocity and the casing. The liquid is vigorously ejected toward the flow path (4). On the other hand, it is the front pool chamber (6) formed by the partition plate (5) that raises the suction flow velocity to create the initial state, and a large mass is temporarily added to the liquid flowing into the front pool chamber (6). Giving and inspiring the suction. Further, as described above, the impeller (2) has a narrow gap between the terminal end portion (23) of the blade portion (21) and the rear surface (24) of the blade portion, and discharges against the diameter of the impeller (2). The outlet is extremely small, and the back surface (24) of the blade has a smooth shape with respect to the outflowing liquid, and the liquid is not splashed at the rear end as in the conventional case, so that there is little rotational resistance and high-speed continuous operation is enabled . Thus, the high speed rotation of the impeller (2) in the pump casing (1) increases the flow velocity and pressure to the maximum and realizes extremely high pressure liquid discharge.

Next, in the fear of liquid backflow from the casing flow path (4), the liquid to be backflowed is provided in a narrow space between the terminal end portion (23) of the blade portion (21) and the blade rear surface (24). Reduces its flow rate and flow velocity, and then prevents the inflow even by an inclined seat surface that gradually tapers when viewed from the discharge port side of the impeller (2), and before it is positioned in front of the impeller (2). The pressure release space of the sump chamber (6) completely extinguishes its flow velocity and prevents liquid backflow.

[0011]

【Example】

 In implementing the present invention, the shape of the impeller (2) may be such that the tip portion (22) of the blade portion (21) is connected toward the center (not shown), as described above, or each of them is connected. It is possible to select any shape such as a substantially water drop shape that is separated from each other to form a space in the central part, but in any shape, the vicinity of the suction port (3) is high and faces the casing flow path (4). The formation of a low seat surface is an important structure for increasing the flow velocity.

[0012] Further, in order to cool the bearing portion of the impeller (2) that rotates at a high speed, a hole () through which cold liquid can be introduced from the impeller chamber (7) into the bearing chamber (8) of the pump casing (1). 9) is formed, and a bypass passage (10) is provided from the bearing chamber (8) to the casing passage (4) to allow the pressurized liquid to flow in and out, thereby providing an appropriate cooling action for the bearing at all times. The durability of each part of the pump is greatly improved.

Further, in the present invention, as shown in FIG. 3, it is possible to incorporate the electric motor (11) into the pump casing (1) and directly connect it to the shaft of the impeller (2). A passage (13) for cooling the electric motor (11) is formed in the drive chamber (12) in which the passage (13) is arranged, and a hole for connecting the passage (13) and the impeller chamber (7). The high pressure liquid is guided from the impeller chamber (7) by the section (9), and while cooling each section from the flow channel (13) of the drive chamber (12), the bypass flow channel (10) causes the casing flow channel ( Discharge to 4).

[0014]

[Effect of device]

 According to the present invention, a large amount of liquid with high pressure can be discharged by the pump structure as described above, high speed rotation is possible with low rotation resistance, and further self-cooling action has great advantages in durability and economy. Show sex. In addition, it has a structure that does not allow backflow of liquid, and the size of the pump itself can be reduced due to the more efficient impeller and built-in structure of the electric motor.

[0015]

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a side sectional view showing an embodiment of the present invention.

FIG. 3 is a side sectional view showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pump casing 2 Impeller 21 Blade part 22 Tip part 23 End part 24 Blade part back surface 25 Blade space part 3 Suction port 4 Casing flow path 5 Partition plate 6 Front reservoir room 7 Impeller room 8 Bearing room 9 Hole part 10 Bypass flow path 11 Electric motor 12 Drive chamber 13 Flow path

Claims (3)

[Scope of utility model registration request] 1. A structure of an impeller and a pump rotatably provided in a pump casing having a plurality of blade portions spirally connecting a front end facing a suction port and a rear end facing a casing flow path, wherein The casing is provided with a partition plate having an intake port, and a front reservoir chamber and an impeller chamber are provided.The impeller has a seat surface that is high near the intake port and low toward the casing flow path, and its blade portion Indicates that the tip portion faces toward the center and the end portion connected to the tip portion is arranged in the vicinity of the back surface of the other blade portion, and the blade space portion constituted by each blade portion is formed in a substantially water drop shape. Characteristic impeller and pump structure. 2. A structure of an impeller and a pump rotatably provided in a pump casing having a plurality of blade portions spirally connecting a tip end facing the suction port and a tail end facing the casing flow path, wherein the pump casing Is a bearing chamber, a front reservoir chamber divided by a partition plate having a suction port, and an impeller chamber, the impeller has a seating surface that is high near the suction port toward the casing flow path, The tip of the vane portion is oriented toward the center and the end portion is arranged close to the back surface of the other vane portion to form a hole for communicating the impeller chamber with the bearing chamber, and the casing channel from the bearing chamber. A structure of an impeller and a pump characterized by having a bypass passage. 3. A structure of an impeller and a pump, which is rotatably provided in a pump casing and has a plurality of blade portions that spirally connect a leading end facing the suction port and a terminating end facing the casing flow path, wherein the pump casing is It consists of a drive chamber that incorporates an electric motor, a front reservoir chamber that is divided by a partition plate that opens a suction port, and an impeller chamber.The impeller has a seat surface that is high near the suction port and low toward the casing flow path. The tip of the vane is oriented toward the center and the end of the vane is arranged close to the back of the other vane, forming a hole that connects the impeller chamber and the flow path of the drive chamber, and A structure of an impeller and a pump, wherein a bypass flow path is provided from a flow path of a chamber to a flow path of a casing.