JP2009235980A - Pump parts bonding structure and pump device - Google Patents

Abstract

The present invention provides an adhesive structure for a pump part that improves the added value at a cost reduction while maintaining a necessary function by devising a liner ring of the pump part to be bonded to a casing.
To insert a liner ring 9 for defining a gap with a blade outer peripheral end 8A of an impeller 2 on an inner peripheral portion 10 of a suction cover 4 of a vertical shaft mixed flow pump, the outer peripheral portion of the liner ring 9 is fitted. A gap peripheral portion 12 for forming the adhesive layer 11 between 9A and the inner peripheral portion 10, positioning means 13 for determining the vertical position of the liner ring 9 with respect to the inner peripheral portion 10, and a lower end of the outer peripheral portion 9A A state of communicating with the clearance peripheral portion 12 and the air vent path 15 that communicates with the sealing means 14 that seals the inner portion and the inner peripheral portion 10, the clearance peripheral portion 12, and that communicates with the upper end of the outer peripheral portion 9 </ b> A to the outside. An adhesive injection port 16 formed in the suction cover 4 is provided, and the liner ring 9 can be bonded to the inner peripheral portion 10 with an adhesive injected from the injection port 16 into the gap peripheral portion 12.
[Selection] Figure 2

Description

  The present invention relates to an adhesive structure for a pump component and a pump device, and more specifically, a liner for defining a gap between a blade outer peripheral end of an impeller and an inner peripheral portion of a casing covering an impeller rotatable around a main shaft. The present invention relates to an adhesive structure for a pump component and a pump device suitable for fitting a ring.

  The liner ring is fitted so that the pumping loss can be reduced and the pumping operation can be performed efficiently by reducing the gap between the blade of the impeller and the inner peripheral portion of the casing as much as possible. For example, Patent Document 1 discloses a cylindrical liner ring that defines an impeller and a gap in a centrifugal pump. This shows a simple cylindrical liner ring, but there is a complicated shape depending on the type of pump.

  For example, as shown in FIG. 7, the liner ring 29 in the vertical shaft mixed flow pump having the vertical axis P is an upper spread formed on an upper portion of a suction cover (an example of a casing) 27 connected to the lower end of the pump casing 28. It is equipped in a state of being fitted in the case portion 27A, and is formed in a shape having a conical inner peripheral surface 29N. The liner ring 29 includes a lower end ring portion 29A that is tightly fitted in the inlay portion 26 at the lower end of the upper spread case portion 27A, and an upper end ring that is placed on the annular seating surface 25 at the upper end of the upper spread case portion 27A and bolted. It is formed in a frustoconical ring member having a portion 29B and a tapered ring portion 29C interposed between the lower end ring portion 29A and the upper end ring portion 29B.

  That is, in FIG. 7, the liner ring 29 has a high dimension so as to reduce and maintain the gap e between the outer peripheral end 8A of the blade 8 and the casing inner peripheral portion, that is, the inner peripheral surface 29N of the liner ring 29. The suction cover 27 is fitted to the suction cover 27 with accuracy. With this configuration, it is possible to improve pump efficiency by minimizing fluid leakage from the gap e. As the material of the liner ring 29, stainless steel is often used, but various other materials are also possible.

  By the way, a mold such as a mold is required to produce the liner ring 29 having the shape shown in FIG. 7, but it is too economical and difficult to manufacture a liner ring having a small production number. Therefore, in reality, a material 30 as shown in FIG. 8 is used. That is, three members 30A, 30C, 30B with annular upper and lower ring members 30B, 30A and a truncated conical surface tapered plate cylinder member 30C (both stainless steel materials) interposed between them, First, it is a production means in which the material 30 is integrally formed by four-round all-around welding, and then a liner ring 29 having a desired shape shown in FIG. 7 is finished by cutting or polishing.

However, some liner rings can reach 1000-2000 mm in diameter, which increases the cost of the material itself, significantly increases the weld length and the manufacturing cost, and makes the liner ring as a product expensive. It was.
JP 2007-146789 A

  The purpose of the present invention is to focus on the technology for assembling the pump parts by bonding, and by revising and improving the structure, the liner ring, which is a part mounted on the pump, is devised to be bonded to the casing. Another object of the present invention is to provide a pump component bonding structure and a pump device that can reduce the cost and improve the added value without deteriorating necessary functions.

The invention according to claim 1 defines a gap between the inner peripheral portion 10 of the casing 4 that covers the impeller 2 that can rotate about the main shaft and the outer peripheral end 8A of the impeller 2 in the pump component bonding structure. In installing the liner ring 9 for
A gap peripheral portion 12 for forming an adhesive layer 11 between the outer peripheral portion 9A of the liner ring 9 and the inner peripheral portion 10 of the casing 4, and the inner peripheral portion 10 of the casing 4 of the liner ring 9 Positioning means 13 for determining the position in the main axis direction, sealing means 14 for sealing one end of the outer peripheral portion 9A and the inner peripheral portion 10 of the casing 4, and the gap peripheral portion 12, and the outer peripheral portion An air vent path 15 that communicates with the outside from a portion corresponding to the other end of 9A, and an adhesive injection port 16 that is formed in the casing 4 in a state of communicating with the gap peripheral portion 12, are provided.
The liner ring 9 can be bonded to the inner peripheral portion 10 by an adhesive injected from the adhesive injection port 16 into the gap peripheral portion 12.

  According to a second aspect of the present invention, in the adhesive structure for a pump component according to the first aspect, the air vent path 15 is the casing 4 at a position in the main shaft direction corresponding to the outer peripheral portion 9A of the liner ring 9 or the outer peripheral portion 9A. It is the recessed part 18 formed in the inner peripheral part 10 or the outer peripheral part of the said liner ring 9, It is characterized by the above-mentioned.

  According to a third aspect of the present invention, in the pump component bonding structure according to the first or second aspect, the positioning means 13 can receive the one end portion 9k of the liner ring 9 from the inner peripheral portion 10 of the casing 4. It is the receiving part 19 which protrudes in the diameter inside.

  According to a fourth aspect of the present invention, in the adhesive structure for a pump part according to the third aspect, the sealing means 14 includes a seal ring 22 between the receiving portion 19 and one end peripheral portion 9a of the liner ring 9. It is characterized by comprising.

  The invention according to claim 5 is the pump component bonding structure according to any one of claims 1 to 3, wherein the sealing means 14 includes one end of the outer peripheral portion 9 </ b> A and the inner peripheral portion 10 of the casing 4. It is comprised by fitting with the part 20 in which the said one end part is fitted.

  The invention according to claim 6 is the pump component bonding structure according to any one of claims 1 to 5, wherein the adhesive injection port 16 is provided on one end side in the main shaft direction of the gap circumferential portion 12, The air vent path 15 is provided on the other end side of the gap peripheral portion 12.

  The invention according to claim 7 is characterized in that a pump device is configured by using the adhesive structure of pump parts according to any one of claims 1 to 6.

  According to the first aspect of the present invention, the liner ring is fixed to the casing by bonding, so that the liner ring can be formed of a simple cylindrical member. It becomes possible. Further, since the casing and the liner ring are integrated with an adhesive, it is not necessary to ensure the strength of the liner ring alone as in the conventional case, and it is possible to form the casing with a thin plate thickness. As a result, the cost can be significantly reduced as compared with the conventional liner ring (see FIG. 8). Further, when the liner ring is set on the inner peripheral portion, since there is no adhesive on the inner peripheral portion and the outer peripheral portion which are contact surfaces, alignment is facilitated and workability is improved. Adhesive can be additionally filled from the inlet, and it is easy to ensure the adhesive fixing quality of the liner ring. Since the air vent path is provided, when filling the adhesive, the air can be smoothly drawn from the peripheral portion of the gap, and the filling rate of the adhesive can be increased.

  Therefore, paying attention to the technology for assembling the pump parts by bonding, by revising and improving the structure, the liner ring, which is a part mounted on the pump, is devised to be bonded to the casing, and the necessary functions Therefore, it is possible to provide an adhesive structure for pump parts that can reduce the cost and improve the added value without dropping the cost.

  According to invention of Claim 2, it can prevent that an adhesive agent leaks from one side, and can ensure the stable adhesion area. Since the adhesive leaking out from the concave portion on the other side can be visually confirmed, there is an advantage that it is easy to check the filling state, such as being able to know the completion of filling of the adhesive when the adhesive overflows from the concave portion. .

  According to the invention of claim 3, there is an advantage that the liner ring can be accurately positioned by an economical means of providing a receiving portion projecting inward in the diameter inside the casing. Further, as in the fourth aspect of the present invention, a sealing means can be rationally configured by using a receiving portion and interposing a seal ring between the receiving portion and one peripheral portion of the liner ring.

  According to the fifth aspect of the present invention, there is an advantage that the sealing means can be constructed by a simple and economical means in which a portion that is fitted on one end of the outer peripheral portion of the liner ring is formed in the casing.

  According to the invention of claim 6, since the air vent path is provided on the other end side, when filling the adhesive from the adhesive injection port on the one end side, the air can be smoothly removed from the peripheral portion of the gap, There is an advantage that the filling rate of the agent can be increased.

  According to the invention of claim 7, a pump device that improves the added value by reducing the cost without deteriorating a necessary function by devising to provide the liner ring, which is a component mounted on the pump, by adhering to the casing. Can be provided.

  Hereinafter, an embodiment of an adhesive structure for pump parts according to the present invention will be described with reference to the drawings when a liner ring is fitted in a casing using an adhesive. 1 is a cross-sectional view of a vertical shaft mixed flow pump lower part, FIG. 2 is an enlarged cross-sectional view of a liner ring part, FIGS. 3A and 3B are partial plan views showing an air vent path, and FIGS. FIG. 6 is a cross-sectional view of the main part showing the sealing means of another structure, FIGS. 7 and 8 are cross-sectional views of the main part showing the conventional liner ring and how to make it, and FIG. The schematic diagram which shows an adhesion structure. 4 to 6 are drawn with the aspect ratio deformed (transformed) to facilitate understanding of the structure.

[Example 1]
FIG. 1 shows a lower portion of a vertical shaft mixed flow pump (an example of a pump device), which has a main shaft 1 having a vertically rotating shaft center (vertical shaft center) P, and a blade attached to a lower end portion of the main shaft 1 in an integrally rotated state. A pump casing 3 surrounding the wheel 2, the impeller 2, a suction cover 4 connected to the lower side of the pump casing 3, a pumping pipe 5 connected to the upper side of the pump casing 3, and a rectifying plate 7. It has a bearing case portion 6 and the like that are integrally formed inside.

  As shown in FIGS. 1 and 2, the impeller 2 includes a hub portion 2 </ b> A that is externally fitted to the main shaft 1, and a plurality of blades 8 that protrude from the hub portion 2 </ b> A. Is configured to be located on the inner surface side of the upper expanding case portion 4A, which is an upper portion of the suction cover (an example of the casing) 4. A liner ring 9 is fitted on the inner peripheral portion 10 of the upper spreading case portion 4A so that the blade outer peripheral end 8A is loosely fitted with a slight gap. That is, to define a gap e between the inner peripheral portion 10 of the suction cover 4 that covers the impeller 2 that can rotate about the vertical axis (an example of a configuration that can rotate about the main shaft), and the outer peripheral end 8A of the impeller 2. The liner ring 9 is fitted.

  The upper expanding case portion 4A includes a gap peripheral portion 12 for forming an adhesive layer 11 between an outer peripheral portion 9A of the liner ring 9 and an inner peripheral portion 10 of the case portion 4A (an example of a casing), and a liner ring. Positioning means 13 for determining the vertical position of the inner peripheral portion 10 with respect to the inner peripheral portion 10, sealing means 14 for sealing the lower end portion of the outer peripheral portion 9A of the liner ring 9 and the inner peripheral portion 10 of the case portion 4A, and the clearance peripheral portion 12 And an air vent path 15 communicating with the upper end of the outer peripheral portion 9 </ b> A to the outside, and an adhesive injection port 16 penetrating in the radial direction in a state communicating with the gap peripheral portion 12. . The liner ring 9 can be bonded to the inner peripheral portion 10 by an adhesive injected from the adhesive injection port 16 into the gap peripheral portion 12. That is, the gap in the radial direction between the inner peripheral surface 9B of the liner ring 9 and the blade outer peripheral end 8A is the gap e.

  The liner ring 9 is a truncated conical wall (tapered cylinder) ring member made of a stainless steel plate, and the clearance e between the inner peripheral portion (inner peripheral surface) 9B and the blade outer peripheral end 8A is accurately set to a minute value. In order to do so, it is fitted into the suction cover 4 and fixed with an adhesive. As shown in FIG. 4, the positioning means 13 includes a stepped peripheral portion (an example of a receiving portion) 19 formed by providing an enlarged diameter portion for fitting the liner ring 9 in the upper expanding case portion 4A. The liner ring 9 has a lower end peripheral portion (an example of the lower end portion 9k) 9a. That is, when the liner ring 9 is dropped and fitted to the inner peripheral portion 10, the upper and lower positions of the liner ring 9 with respect to the suction cover 4 are determined by the lower end peripheral portion 9 a coming into contact with and received by the stepped peripheral portion 19. It is.

  As shown in FIG. 5, the sealing means 14 has a fitting inner peripheral surface (“the lower end portion in the inner peripheral portion” formed on the case portion 4 </ b> A that extends upward so as to be fitted on the outer peripheral portion (outer peripheral surface) 9 </ b> A of the liner ring 9. An example) 20) and the outer peripheral portion 9A. That is, the seal structure provides a sealing function by a configuration in which the lower end portion of the outer peripheral portion 9A of the liner ring 9 and the fitting inner peripheral surface 20 are fitted with a small gap in the radial direction. Further, similarly to the sealing means 14, a fitting upper peripheral surface 17 is formed at the upper end portion of the inner peripheral portion 10 to fit the upper end portion of the outer peripheral portion 9 </ b> A. A tapered annular gap peripheral portion 12 is formed between the upper and lower surfaces of the fitting inner peripheral surface 14 and the fitting upper peripheral surface 17 as a portion having a larger diameter than those.

  As shown in FIGS. 2 and 4, the air vent path 15 is constituted by a vertical groove 18 formed in the upper and lower direction on the fitting upper peripheral surface 17. The vertical grooves 18 are formed at a plurality of locations at appropriate intervals in the circumferential direction, and communicate the gap peripheral portion 12 with the outside. In the fitted state in which the liner ring 9 is fitted to the inner peripheral portion 10, the outer peripheral portion 9A serves as a wall surface, and the vertical groove 18 is formed into a vertical hole. The adhesive injection port 16 is a radial through-hole formed in the case portion 4 </ b> A that expands upward at the gap peripheral portion 12.

  Next, the fitting method (assembly means) of the liner ring 9 will be described. First, the liner ring 9 is expanded upward and fitted into the inner peripheral portion 10 of the case portion 4A, the outer peripheral portion 9A of the liner ring 9 is fitted to the fitting inner peripheral surface 20 and the fitting upper peripheral surface 17, and the lower end periphery is fitted. A fitting process is performed in which the portion 9a is positioned in contact with the stepped peripheral portion 19 (see FIGS. 2 and 3A). When the liner ring 9 is fitted to the inner peripheral portion 10, an adhesive injection step for injecting the adhesive b from the injection port 16 and filling the gap peripheral portion 12 is performed as shown in FIG. Reference numeral 21 denotes an injection port of the adhesive injection means.

  At this time, since the lower end of the gap peripheral portion 12 is effectively blocked by the sealing means 13, the air present in the gap peripheral portion 12 due to the injection of the adhesive passes through the upper vertical groove (an example of a recess) 18. Will be discharged to the outside. Accordingly, the adhesive b poured from the injection port 16 mainly fills the gap peripheral portion 12 from below by gravity, and finally fills the vertical groove 18 as the air vent path 15, as shown in FIG. The gap periphery 12 is filled with the adhesive b. When the adhesive b is cured, the adhesive layer 11 is formed, and the liner ring 9 can be expanded and firmly fixed to the case portion 4A. Note that the injection port 16 may be provided at the lower end portion of the gap peripheral portion 12 as shown by a virtual line in FIG. Thus, since the casing 4 and the liner ring 9 are integrated with the adhesive b, it is not necessary to secure the strength of the liner ring alone as in the conventional case, and it is possible to form even a thin plate. Become.

  By the way, in order to bond the objects having the vertically bonded surfaces using an adhesive, conventionally, as shown in FIG. 9, the adhesive b is previously applied to the bonded surface 23A of the base (base member) 23. Generally, a method is adopted in which the component 24 that is an object to be bonded is moved, and the bonded surface 24A is pressed against the bonded surface 23A of the base 23 to be crimped. However, in this adhesive structure, since the applied adhesive b tends to flow downward due to gravity, there is a problem that the adhesive is biased downward and the adhesive surface is not easily made uniform. Then, it is difficult to position the component 24 with respect to the base 23 simply by pressing. If the bonding is insufficient, it is necessary to once remove the component 24 from the base 23, but it is difficult to remove the adhesive, and it is difficult to reattach or replace the component. Moreover, there are some aspects in which it is difficult to evaluate the adhesion because the adhesion status cannot be seen.

  On the other hand, in the bonding structure of the pump component according to the present invention, the gap peripheral portion 12 for forming the adhesive layer 11 between the outer peripheral portion 9A and the inner peripheral portion 10 of the liner ring 9, Positioning means 13 for determining the position in the vertical direction with respect to the peripheral portion 10, sealing means 14 for sealing the lower end portion of the outer peripheral portion 9A and the inner peripheral portion 10, and the upper end of the outer peripheral portion 9A communicating with the gap peripheral portion 12 An air vent path 15 communicating from the corresponding part to the outside and an adhesive inlet 16 formed in the casing 4 in a state of communicating with the gap peripheral part 12 are provided, and injected from the adhesive inlet 16 into the gap peripheral part 12. Since the liner ring 9 can be bonded to the inner peripheral portion 10 with an adhesive, the following effects can be obtained.

  In other words, due to the structure that allows the adhesive to be so-called “back-filling”, there is no adhesive on the contact surface (inner peripheral portion 9A, outer peripheral portion 10) when the member (liner ring 9) is set. (Positioning of the liner ring 9 by the positioning means 13) is facilitated, and workability (workability of fitting the liner ring 9 into the case part 4A) is improved. Further, an adhesive can be additionally filled from the injection port 16, and it is easy to ensure the adhesive fixing quality of the liner ring 9.

  And since the air vent path 15 is provided, when filling the adhesive, the air can be smoothly removed from the gap peripheral portion 12, and the filling rate of the adhesive can be increased. Moreover, since the vertical groove (one embodiment of the concave portion) 18 that is an air vent path is provided in the upper portion of the gap peripheral portion 12, the adhesive can be prevented from leaking from below, and a stable bonding area can be secured. . Further, since the adhesive leaking upward from the vertical groove 18 can be visually confirmed, it is easy to check the filling state, for example, the completion of the filling of the adhesive can be known when the adhesive overflows from the vertical groove 18. There are advantages. Since the casing 4 and the liner ring 9 are integrated with the adhesive b, it is not necessary to ensure the strength of the liner ring alone as in the conventional case, and it is possible to form even a thin plate.

[Another Example]
The adhesive structure according to the present invention can be applied to anything other than a liner ring, that is, a pump part, such as a blade of an impeller that is bonded and fixed to a hub portion, and a pump device using the same is also possible. It is.

  As shown in FIG. 6, the sealing means 14 may be configured by interposing a seal ring 22 between the stepped peripheral portion 19 and the lower end peripheral portion 9a. In this means, since the stepped peripheral portion 19 and the lower end peripheral portion 9a are sealed, the fitting inner peripheral surface 20 can be machined at a lower accuracy than in the case of the first embodiment, and the cost can be reduced. Further, the positioning means 13 may have a configuration in which the lower end peripheral portion 9 a abuts on the seal ring 22.

  As shown in FIG. 3B, the air vent path 15 can also be configured by providing a vertical groove 18 on the upper portion of the outer peripheral portion 9 </ b> A of the liner ring 9. The receiving part 19 may be a protrusion part that protrudes partially radially inward in addition to the stepped peripheral part (annular protrusion part) 19 shown in FIG. In the above-described embodiment, the liner ring of the vertical shaft pump has been described, but it goes without saying that even a horizontal shaft pump can be formed in the same manner if the operation is performed with the casing arranged in the vertical direction when the adhesive is filled. Yes.

Sectional drawing (Example 1) which shows the lower structure of a vertical shaft diagonal flow pump Enlarged sectional view of the liner ring part in FIG. An air vent path is shown, (a) is a principal part arrow view when a recessed part is formed in a casing, (b) is a principal part arrow view when a recessed part is formed in a liner ring. Action diagram showing the situation during filling of the adhesive around the gap Sectional drawing of the principal part which shows the filling completion state of the adhesive agent to a clearance peripheral part Sectional drawing of the principal part which shows the sealing means of another structure Sectional drawing of the principal part which shows the conventional liner ring and mounting structure Sectional view showing the material of the liner ring shown in FIG. Action diagram of main part showing general bonding structure

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main shaft 2 Impeller 4 Casing 8A Blade outer peripheral end 9 Liner ring 9A Outer peripheral part 9a One end peripheral part 9k One end part 10 Inner peripheral part of casing 11 Adhesive layer 12 Crevice peripheral part 13 Positioning means 14 Sealing means 15 Air vent path 16 Adhesive Inlet 18 Recess 19 Receiving portion 20 Part where one end of inner peripheral portion is fitted 22 Seal ring

Claims (7)

In fitting a liner ring for defining a gap with the outer peripheral end of the impeller on the inner peripheral portion of the casing covering the impeller rotatable around the main shaft,
A gap peripheral portion for forming an adhesive layer between the outer peripheral portion of the liner ring and the inner peripheral portion of the casing, and positioning means for determining a position of the liner ring in the main axis direction with respect to the inner peripheral portion of the casing; Sealing means for sealing one end portion of the outer peripheral portion and the inner peripheral portion of the casing; an air vent path communicating with the gap peripheral portion and communicating with the outside from a portion corresponding to the other end of the outer peripheral portion; An adhesive injection port formed in the casing in a state communicating with the peripheral portion of the gap is provided,
An adhesive structure for a pump component configured such that the liner ring can be bonded to the inner peripheral portion by an adhesive injected from the adhesive inlet into the peripheral portion of the gap.   2. The pump component according to claim 1, wherein the air vent path is a recess formed in an inner peripheral portion of the casing or an outer peripheral portion of the liner ring at an outer peripheral portion of the liner ring or a position in a main shaft direction corresponding to the outer peripheral portion. Adhesive structure.   The pump part bonding structure according to claim 1 or 2, wherein the positioning means is a receiving portion that protrudes radially inward so as to be able to receive one end portion of the liner ring from an inner peripheral portion of the casing.   The adhesive structure for a pump component according to claim 3, wherein the seal means is configured by interposing a seal ring between the receiving portion and one end peripheral portion of the liner ring.   The said sealing means is comprised by fitting the one end part of the said outer peripheral part, and the part by which the said one end part in the inner peripheral part of the said casing is fitted. Adhesive structure of the described pump parts.   The said adhesive agent injection port is provided in the one end side of the principal axis direction of the said clearance gap part, The said air vent path | route is provided in the other end side of the said clearance gap part. Adhesive structure of pump parts.   The pump apparatus using the adhesion structure of the pump components as described in any one of Claims 1-6.

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