JP2582129Y2 - Special pump device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a special pump device combining a turbine pump and a jet pump.

[0002]

2. Description of the Related Art This type of special pump device is conventionally known as shown in FIG.
1, a box-shaped casing 1 is provided. The casing 1 has a fluid inlet 2 and an outlet 3, and a cover 4 is provided at an open end of the casing 1 opposite to the inlet 2.
Is blocked by

[0003] Inside the casing 1, a tubular suction passage portion 5 connected to the inlet 2 is formed. The suction passage 5 extends toward the center of the casing 1.
At the downstream end of the suction passage 5, a diffuser support 6 having a straight pipe shape is formed. The downstream end of the diffuser support 6 is open toward the cover 4, and a female screw 7 is formed on the inner peripheral surface of the downstream end of the diffuser support 6.

A diffuser 8 is inserted inside the diffuser support 6. The diffuser 8 has a male screw portion 9 on the outer peripheral surface. By screwing the male screw portion 9 into the female screw portion 7, the diffuser 8 is held by the diffuser support portion 6. The downstream end of the diffuser 8 projects from the open end of the diffuser support 6. A nozzle 10 is coaxially arranged upstream of the diffuser 8. The nozzle 10 is provided with the suction passage 5
The upstream end of the nozzle 10 is opened inside the casing 1.

[0005] The cover 4 supports a main shaft 13 that is driven to rotate by a motor 12. The tip of the main shaft 13 penetrates through the cover 4 and is introduced into the casing 1. The main shaft 13 is coaxial with the diffuser 8, and a centrifugal impeller 1 is provided at the tip of the main shaft 13.
4 is attached. The impeller 14 has a suction port 15 at the center of rotation and a discharge port 16 connected to the suction port 15 on the outer peripheral surface. The suction port 15 of the impeller 14 faces the downstream end of the diffuser 8.

[0006] The impeller 14 is covered by a guide vane 18. The guide vane 18 has a hollow boss 19 at the center thereof. The boss 19 is supported on the outer periphery of the suction port 15 of the impeller 14 via a bearing 20. The boss 19 coaxially surrounds the downstream end of the diffuser 8 protruding from the diffuser support 6, and the tip of the boss 19 is close to the open end of the diffuser support 6.

[0007] The boss portion 19 has a concave portion 21 which is continuous in the circumferential direction.
It has. The concave portion 21 is continuously opened on the outer peripheral surface of the boss portion 19 and the distal end surface facing the diffuser support portion 6. The O-ring 2 is provided in the recess 21.
2 is installed. The O-ring 22 is sandwiched between the opening end of the diffuser support 6 and the boss 19 to seal a gap between the diffuser support 6 and the boss 19. This allows the impeller 14
The suction side and the discharge side are separated in a liquid-tight manner.

[0008]

In the conventional special pump device, the diffuser 8 is attached by screwing the diffuser 8 into the diffuser support portion 6, so that the female screw portion 7 is formed on the inner surface of the diffuser support portion 6 and the diffuser 8 is formed.
It was necessary to form the male screw portion 9 on the outer peripheral surface of the. For this reason, the casing 1 and the diffuser 8 have to be subjected to troublesome screw processing, and accordingly, there is a problem that the number of processing steps is increased and the processing is troublesome.

Further, in order to attach the diffuser 8 to the diffuser support 6, the male screw 9 is sequentially connected to the female screw 7.
It is necessary to screw it into the diffuser 8
It takes time and effort to mount. At the same time, if the diffuser 8 is tilted when the diffuser 8 is screwed in, the screw thread may be crushed.
It is necessary to be careful in mounting. For this reason, the diffuser 8 cannot be easily incorporated in the casing 1, and there is still room for improvement in the workability in mounting.

In the above-described conventional special pump device, the gap between the diffuser support portion 6 and the guide vane 18 is set to O.
By sealing with the ring 22, the suction side and the discharge side of the impeller 14 are liquid-tightly partitioned.

However, in such a configuration, a dedicated O-ring 22 is required, so that the number of parts is increased and a recess 21 for mounting the O-ring 22 on the guide vane 18 must be formed. . For this reason, there is a problem that the number of processing steps of the guide vanes 18 increases, and the cost increases as the number of parts increases.

The present invention has been made in view of such circumstances, and it is possible to simplify the mounting structure of the diffuser and the sealing structure around the diffuser, to facilitate the assembling work, and to reduce the cost. For the purpose of providing.

[0013]

In order to achieve the above object, a special pump device according to the present invention is provided with a cylindrical diffuser supporting portion connected to the inlet inside a casing having a fluid inlet and an outlet. A configuration in which the diffuser is mounted inside the diffuser support portion, and an impeller facing the downstream end of the diffuser is accommodated in the casing, and the impeller is covered with a guide vane from the diffuser support portion side. Is assumed.

The diffuser includes a cylindrical body fitted and held inside the diffuser support, and an annular sealing projection continuously projecting circumferentially on the outer peripheral surface of the body. The seal projection is sandwiched between the diffuser supporting portion and the guide vane to liquid-tightly partition the suction side and the discharge side of the impeller.

[0015]

According to such a configuration, the diffuser can be simply fitted into the diffuser support, so that the work of attaching the diffuser can be performed easily as compared with the conventional case, and the diffuser and the diffuser support are cumbersome and troublesome. Screw processing can be omitted.

Further, since the seal between the diffuser support portion and the guide vane is formed by a sealing projection integrated with the diffuser, a dedicated O-ring and ring packings are not required. For this reason, not only can the number of parts be reduced, but also the structure for holding the O-rings and ring packings from the guide vanes can be omitted, and the structure of the guide vanes can be simplified accordingly, and the number of processing steps can be reduced. Becomes possible.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG. In this embodiment, since the main components of the pump device are the same as those of the conventional pump device, the same components as those of the conventional pump device are denoted by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 1, the inner surface of the diffuser supporting portion 6 having a straight pipe shape is finished to a smooth surface having no thread. The diffuser 8 inserted into the diffuser support 6 has a cylindrical body 31. The outer peripheral surface of a portion of the body 31 to be inserted into the diffuser support 6 is finished to a smooth surface that slidably contacts the inner surface of the diffuser support 6. Therefore, the diffuser 8 is supported by the diffuser support 6 by fitting the diffuser 8 into the diffuser support 6.

On the outer peripheral surface of the body 31, an annular sealing projection 32 is continuously provided in the circumferential direction. The sealing projection 32 is provided on the opening end face 6 a of the diffuser support 6.
And a second seal surface 33b contacting the end surface 19a of the boss 19 of the guide vane 18.
And The first sealing surface 33a comes into contact with the opening end surface 6a when the diffuser 8 is fitted into the diffuser support portion 6, and the contact length between the diffuser support portion 6 and the diffuser 8 is reduced by this contact. Stipulated.

The sealing projection 32 is sandwiched between the opening end face 6 a of the diffuser support 6 and the end face 19 a of the boss 19. The first of the sealing projections 32
The sealing surface 33a is closely contacted with the opening end surface 6a without any gap, and the second sealing surface 33b is
Of the diffuser support portion 6 and the boss portion 19 in a liquid-tight manner. Thus, the suction side and the discharge side of the impeller 14 are liquid-tightly partitioned. Note that reference numeral 34 in the figure denotes a drain port.

In the special pump device having such a configuration, when the impeller 14 is driven to rotate, the fluid flows into the suction passage 5 from the inlet 2 of the casing 1. The pressure of this fluid is increased while passing through the diffuser 8, and is guided to the suction port 15 of the impeller 14. The fluid sucked into the suction port 15 is discharged from the discharge port 16 into the casing 1 via the guide vanes 18. The fluid discharged into the casing 1 is divided into a flow toward the outlet 3 and a flow toward the nozzle 10. Since the fluid guided to the nozzle 10 has a higher pressure than the fluid flowing from the inlet 2,
The high-pressure fluid is jetted through the nozzle 10 to the diffuser 8. Due to this injection, a low-pressure portion is generated at the upstream end of the diffuser 8, and the inflow of fluid from the inlet 2 is promoted. Then, the inflow fluid and the ejection fluid are united in the diffuser 8 and guided to the suction port 15 of the impeller 14.

Since the diffuser 8 for increasing the pressure of the fluid is incorporated in the casing 1 by being fitted into the diffuser supporting portion 6, it is not necessary to rotate the diffuser 8 and screw in the diffuser 8 in a conventional manner. Therefore, the work of attaching the diffuser 8 can be easily performed. In addition, there is no need to perform a troublesome and troublesome threading process on the diffuser 8 and the diffuser support 6, and the labor of the processing can be saved.

Since the seal between the diffuser support 6 and the guide vanes 18 is formed by the sealing projection 32 integrated with the diffuser 8, a dedicated O-ring or ring packing is not required. For this reason, not only can the number of parts be reduced, but also the structure for holding the O-rings and ring packings from the guide vanes 18 can be omitted, so that the structure of the guide vanes 18 is simplified and the number of processing steps is reduced. be able to.

Therefore, the structure around the diffuser 8 and the guide vanes 18 can be greatly simplified when viewed as a whole pump device, so that assembling can be facilitated and the manufacturing cost can be reduced. it can.

[0025]

According to the present invention described in detail above, since the diffuser need only be fitted into the diffuser support, the mounting operation can be performed more easily than in the past, and the diffuser and the diffuser support are troublesome. Time-consuming screw processing can be omitted. In addition, since the seal between the diffuser support portion and the guide vane is formed by a sealing projection integrated with the diffuser, a dedicated O-ring or ring packing is not required. Therefore, not only can the number of parts be reduced,
The structure for holding the O-rings from the guide vanes can be omitted, and accordingly, the structure of the guide vanes can be simplified, and the number of processing steps can be reduced.

Therefore, when viewed as a whole of the pump device, the structure around the diffuser and the guide vanes is greatly simplified, so that there is an advantage that the assembling can be performed easily and the device can be provided at a low cost.

[Brief description of the drawings]

FIG. 1 is a sectional view of a special pump device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a conventional special pump device.

[Explanation of reference numerals] 1 ... casing, 2 ... inlet,
3 ... exit, 6 ... diffuser support, 8 ... diffuser, 14 ... impeller, 18 ... guide vane,
31: body, 32: seal projection.

────────────────────────────────────────────────── ─── of the front page continued (56) references Tokuoyake Akira 48-29883 (JP, B1) real public Akira 42-910 (JP, Y1) (58 ) investigated the field (Int.Cl. ^6, DB name) F04D 13/12 F04D 29/08

Claims (1)

(57) [Scope of request for utility model registration] 1. A casing having an inlet and an outlet for fluid, a tubular diffuser support provided inside the casing and connected to the inlet, a diffuser mounted inside the diffuser support, and the casing Is housed in the diffuser, and a guide vane that faces the downstream end of the diffuser and that faces the diffuser from the side of the diffuser support. A cylindrical body to be fitted and held, and an annular sealing projection projecting continuously from the outer peripheral surface of the body in the circumferential direction. The sealing projection is provided with the diffuser supporting portion. The impeller is sandwiched between the guide vanes to liquid-tightly separate the suction side and the discharge side of the impeller. Special pumping equipment.