WO1997037133A1 - Casing for fluid machinery - Google Patents

Abstract

A casing for use in fluid machinery, enclosing a fluid being treated, and comprising a nozzle (70) for transferring the fluid being treated to and from outside a system, a flange (71) detachably mounted to an outer periphery of the nozzle (70) for securement of parts outside a system and the nozzle (70), a pressure taking-out pipe (72) adapted to be mounted from a side of the outer periphery of the nozzle (70), and a through hole (71b) or a notch (71c) provided on the flange (71) for guiding the pressure taking-out pipe (72) to an outer periphery of the flange (71).

Description

 Description Technical field of casing for fluid machinery

 The present invention relates to a casing used in a fluid machine and containing a handled fluid, and more particularly to a casing provided with pressure extracting means (pressure gauge mounting means). Background art

 Depending on the structure of the fluid machine, it is often difficult to install pressure gauges. For example, the applicant of the present application has previously proposed an inline pump disclosed in Japanese Patent Application Laid-Open No. 6-88589.

 Pumps are often provided with screw holes for measuring discharge pressure and shipped closed with a plug.

 When the pump described in Japanese Patent Application Laid-Open No. 6-88859 is provided with a hole for measuring the discharge pressure, the following problems occur.

 (1) Space for the socket (pressure extraction pipe) is required, which increases the face-to-face dimension.

 ② Since holes or seats are required to attach sockets to sheet metal casings (press-formed products), the suction-side casing body and the discharge-side casing body are not common, and are unique to press molding. However, the advantage that the cost of the same component increases as the amount of the same component increases, cannot be exploited.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a casing for a fluid machine provided with a pressure extracting means without increasing the external dimensions of the fluid machine. Disclosure of the invention

 A first aspect of a casing for a fluid machine of the present invention is used for a fluid machine, and in a casing for containing a fluid, a nozzle for transferring a handled fluid to and from the outside of the system and a detachable outer peripheral portion of the nozzle. A flange that is mounted to fix the nozzle to the external system components, a pressure extraction pipe that is mounted from the outer periphery of the nozzle, and a through hole that is provided in the flange to guide the pressure extraction pipe to the flange outer periphery. Alternatively, a notch is provided.

 A second aspect of the casing for a fluid machine of the present invention is used in a fluid machine, and in a casing containing a fluid, a nozzle for transferring a handled fluid to and from the outside of the system, and detachably attached to an outer peripheral portion of the nozzle. It has a flange for fixing the external parts and the nozzle, and a pressure extraction pipe attached from the outer periphery of the nozzle.The nozzle and the flange are positioned using the pressure extraction pipe. Features.

 A third aspect of the casing for a fluid machine according to the present invention is used in a fluid machine, and in a casing containing a fluid, a nozzle for exchanging a handled fluid with the outside of the system, and detachable on an outer peripheral portion of the nozzle. A flange for fixing external components and nozzles, a pressure extraction pipe mounted from the outer periphery of the nozzle, and an axial end of the nozzle that are fixed to the nozzle so that they cannot be removed. And a pressure extraction pipe attached to the outer periphery of the nozzle.

The present invention provides a casing body made of a thin stainless steel plate (sheet metal), a nozzle made of a stainless steel that is welded to the casing body to transfer a fluid to be handled, and fixed to the outer periphery of the nozzle with a screw. It is particularly effective in pumps with a product flange and a loose ring-shaped aluminum die-cast casing flange for attaching the casing body to the fluid machine body. O

 The above material configuration aims at the right person in the right place. In other words, stainless steel material is used for the liquid-contact part, and low-cost iron / aluminum die-cast is used for the non-wetted part. In addition, the use of steel for the flanges has made it possible to ensure high rigidity against piping loads.

 Since the present invention is configured as in the first embodiment, the pressure outlet can be provided without particularly increasing the outer dimensions of the pump.

 Further, according to the second aspect of the present invention, the flange can be positioned by the pressure extraction pipe. For example, in FIG. 1 of the present invention, the flange on the pump suction side is only screwed into the nozzle, and the angle of the bolt hole of the flange can be freely set in relation to the screw. In other words, the above positioning must be performed when installing the pump. In the present invention, after the flange is screwed into the nozzle, the flange and the nozzle can be positioned by using the pressure extracting pipe, so that there is no need to perform positioning during installation. According to the third aspect of the present invention, the casing body can be shared, and the advantage of press molding productivity can be effectively exhibited.

 In a preferred embodiment of the present invention, since the pressure extraction pipe is arranged at a position avoiding the maximum outer diameter portion of the flange, there is an effect of keeping the pressure extraction pipe short. Since the above pipes are in contact with the liquid, expensive materials (stainless) are often used. For this reason, shorter pipes are better. In a preferred embodiment of the present invention, the flange is provided with legs. Obviously, it is useful to position the pipes when positioning the flanges. That is, if there is no positioning, for example, the position of the frequency converter becomes unstable.

In a preferred embodiment of the present invention, there is a loose ring-shaped casing flange for attaching the casing body to the fluid machine body, and the flange is provided. The outer diameter of the flange is set larger than the inner diameter of the casing flange. If there is a casing flange, it is highly necessary to attach and detach the flange. BRIEF DESCRIPTION OF THE FIGURES

 FIG. 1 is a sectional view showing an embodiment of an all circumferential flow type in-line pump provided with a casing for a fluid machine according to the present invention, and FIG. 2 is a sectional view taken along the line II-II of FIG. FIG. 3 is a view taken in the direction of the arrow III in FIG. 1, and FIG. 4 is a cross-sectional view showing an example of the relationship among the nozzle, the flange, and the pressure extraction pipe in the fluid machine casing of the present invention. FIG. 6 is a cross-sectional view showing another example of the relationship between the nozzle, the flange, and the pressure extraction pipe in the fluid machine casing of the present invention. FIG. 7 is a cross-sectional view illustrating another example of the relationship between the flange and the pressure extraction pipe, and FIG. 7 is a cross-sectional view illustrating another example of the relationship between the nozzle, the flange, and the pressure extraction pipe in the fluid machine casing of the present invention. is there. BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, an embodiment of a casing for a fluid machine according to the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 is a sectional view showing an all-peripheral flow type in-line pump provided with a casing for a fluid machine according to the present invention, and FIG.

FIG. 1 is a cross-sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a view taken in the direction of arrows in FIG.

The all circumferential flow type motor pump shown in the present embodiment has a pump casing 1, a can motor 6 housed in the pump casing 1, and fixed to an end of a main shaft 7 of the can motor 6. An impeller 8 is provided. The bomb casing 1 has a pump casing 2, a suction casing 3 connected to both ends of the pump casing 2 by casing flanges 61, 62, and a discharge casing 4. It consists of Casein The flanges 6 1, 6 2 constitute a loose ring-shaped casing flange for fixing the suction casing 3 and the discharge casing 4 to the outer cylinder 2. The pump casing outer cylinder 2, the suction casing 3, and the discharge casing 4 are formed of a sheet metal made of stainless steel or the like. A bracket 45 is attached to the outer surface of the outer cylinder 2. The frequency converter assembly 50 is mounted on the bracket 45. The frequency converter assembly 50 includes a base 46 mounted on the bracket 45, a cover 47 mounted on the base 46, and a frequency converter body 48 surrounded by the base 46 and the cover 47. It is composed of

 The bracket 45 is provided with a hole 45a for electrically connecting the CAN module 6 to the frequency converter body 48. The bracket 45. The base 46 and the cover 47 are each formed of a heat conductor made of an aluminum alloy.

 On the other hand, the candies 6 are welded to the stator 13, the outer frame 14 on the outer periphery of the stator 13, and the open ends of the outer frame 14 on the outer frame. Motor frame side plates 15 and 16 to be fixed, and can 17 fitted to the inner peripheral portion of stator 13 and welded and fixed to motor frame side plates 15 and 16 are provided. The rotor 18 rotatably accommodated in the stator 13 is shrink-fitted and fixed to the main shaft 7. An annular space (flow path) 40 is formed between the outer frame 14 and the outer cylinder 2 of the motor frame.

 The motor frame side plate 16 of the can motor 6 holds a guide member 11 for guiding fluid from the outside in the radial direction to the inside. An inner casing 12 for accommodating the impeller 8 is fixed to the guide member 11. In addition, a seal member 13 is interposed on the outer periphery of the guide member 11.

A liner ring 51 is provided at the inner end of the guide member 11, and the liner ring 51 is provided. The ring 51 slides on the front surface of the impeller 8 (on the suction mouse side). The inner casing 12 has a roughly dome shape, and has a shape that covers the shaft end of the main shaft 7 of the candies 6. The casing 12 has a guide device 12 a formed of a guide vane or a volume for guiding the fluid discharged from the impeller 8. The inner casing 12 has an air vent hole 12b at the tip.

 A lead wire housing 20 is fixed to the outer frame outer shell 14 by welding, and a lead wire is wound from a coil in the outer frame 14 through the lead wire housing 20. Pull it out and connect it to the base 46 and the frequency converter body 48 inside the power bar 47 via the hole 45 a of the bracket 45 and the lead wire hole 46 a of the base 46. I have. In addition, the lead wire of the frequency converter body 48 is connected to the power cable in the base 46 and the cover 47. The outer cylinder 2 is formed with a hole 2a, and the lead wire housing 20 is inserted into the hole 2a.

 Next, the bearing peripheral portion on the impeller 8 side will be described.

 The bearing bracket 21 is provided with a radial bearing 22 and a fixed-side thrust bearing 23. The end face of the radial bearing 22 is also provided with a function as a fixed-side thrust sliding member. On both sides of the radial bearing 22 and the fixed-side thrust bearing 23, a rotating-side thrust bearing 24 and a rotating-side thrust bearing 25, which are rotating-side thrust sliding members, are provided. The rotating thrust bearing 24 is fixed to a thrust disk 26, and the thrust disk 26 is fixed to the main shaft 7 via a key. The rotating thrust bearing 25 is fixed to a thrust disk 27, and the thrust disk 27 is fixed to the main shaft 7 via a key.

The bearing bracket 21 is inserted through an O-ring 29 made of a resilient material into a hollow provided on the motor frame side plate 16. The figure Reference numeral 31 denotes a sleeve that forms a sliding portion with the radial bearing 22.

 Next, the bearing peripheral portion on the side of the impeller 8 will be described.

 A radial bearing 33 is provided on the bearing bracket 32. In the figure, reference numeral 34 denotes a sleeve that forms a sliding portion with the radial bearing 33.The sleeve 34 contacts the washer 35, and the washer 35 is a screw and a double nut provided at the end of the main shaft 7. It is fixed by U3 36. The bearing bracket 32 is inserted through a 0-ring 37 made of an elastic material into an annular space provided in the module frame side plate 15.

 Also, a stay 43 is welded to the outer frame 14 of the unit frame, and the stay 43 and the outer cylinder 2 are fixed by welding. The number of revolutions of the CAN mode 6 is set to 400 rpm or more by the frequency converter body 48.

 Next, a method of attaching the pressure extraction pipe will be described with reference to FIGS. 1, 3, and 4. FIG. FIG. 4 is a diagram showing a relationship among a discharge nozzle, a flange and a pipe for extracting pressure, FIG. 4A is a sectional view, and FIG. 4B is a top view of the discharge flange.

A discharge nozzle 70 is fixed to the discharge casing 4 constituting the casing body by welding. As shown in a detailed view in FIG. 4, the discharge nozzle 70 is formed of an annular member having a large outer diameter and a large wall thickness. The discharge nozzle 70 is made of the same material as the casing body, such as stainless steel, and has an opening 70a and a male thread 70b that form the nozzle diameter. The sealing surface is 70 s. That is, the outer peripheral portion of the discharge nozzle 70 forms the outer diameter of the seal surface. On the other hand, the discharge flange 71 fixed to the discharge nozzle 70 is made of a material different from that of the casing body, for example, iron (FC) or the like, and has a female screw portion 71a at the inner end thereof. The female thread 7 1a is screwed into the discharge nozzle 70 Have been.

 The upper part of the discharge flange 71 is chamfered as shown in FIG. In addition, the installation flange 71L is formed on the discharge flange 71.

 The discharge nozzle 70 has a through screw hole 70c, and the discharge flange 71 has a through hole 71b. The pressure extraction pipe 72 is passed through the through hole 71b, and the tip of the pressure extraction pipe 72 is screwed into the through screw hole 70c of the discharge nozzle 70. A plug 73 is detachably attached to the pressure extracting pipe 72. The pressure extraction pipe 72 is mounted at a chamfered position avoiding the maximum outer diameter of the discharge flange 71. By removing the plug 73 and attaching a pressure gauge to the pressure extraction pipe 72, the discharge pressure can be measured.

 Further, as shown in FIG. 1, a suction nozzle 74 is similarly fixed to the suction casing 3 constituting the casing body, and a suction flange 75 is fixed to the suction nozzle 74. . The suction flange 75 has legs 75 L formed in a body. The outer diameters of the discharge flange 71 and the suction flange 5 are larger than the inner diameters of the casing flanges 61 and 62.

 Briefly explaining the operation of the all circumferential pump shown in FIG. 1, the fluid sucked from the suction nozzle 74 connected to the suction casing 3 passes through the suction casing 3 to the outer cylinder 2 and canister. It flows into the annular flow path 40 formed between the outer frame 14 of the motor and the domo 6 and is guided by the guide member 11 through the flow path 40 into the impeller 8. Be guided. The fluid discharged from the impeller 8 is discharged from a discharge nozzle 70 connected to the discharge casing 4 via the guide device 12a.

The present invention relates to a suction casing 3 and a discharge casing 4 which constitute a casing body made of a stainless thin plate (sheet metal), and a casing body. Stainless steel suction nozzles 74 and discharge nozzles 70 that are in contact with and receive and handle the fluid, and a suction suction nozzle 75 that is fixed to the outer circumference of the suction nozzles 74 and discharge nozzles with screws. A loose-type ring-shaped aluminum die cast for attaching the discharge flange 71, the suction casing 3 and the discharge casing 4 constituting the casing body to the candies 6 having an annular flow path 40. This is particularly effective for pumps provided with casing flanges 61 and 62.

 The above material configuration aims at the right person in the right place. In other words, stainless steel material is used for the liquid-contact part, and low-cost iron / aluminum die-cast is used for the non-wetted part. In addition, the use of steel for the flanges has made it possible to ensure high rigidity against piping loads.

 The casing according to the present invention includes a discharge nozzle 70 for exchanging a fluid to be handled with the outside of the system, a detachable nozzle which is detachably attached to an outer peripheral portion of the discharge nozzle 70, and connects the discharge nozzle 70 to a system such as a pipe. A discharge flange 71 for fixing, a pressure extraction pipe 72 attached from the outer periphery of the discharge nozzle 70, and a discharge flange 71 for guiding the pressure extraction pipe 72 to the flange outer periphery. It has a through hole 71b provided. Thus, the pressure outlet can be provided without particularly increasing the outer dimensions of the pump.

In the casing of the present invention, the positioning of the discharge nozzle 70 and the discharge flange 71 is performed using the pressure extracting pipe 72. For example, in FIG. 1 of the present invention, the suction flange 75 on the pump suction side is merely screwed into the suction nozzle 74, and the angle of the bolt hole of the flange is free in relation to the screw. Can be set to In other words, the above positioning must be performed at the time of pump installation. In the case of the discharge flange 71 on the pump discharge side, screw the discharge flange 71 into the discharge nozzle 70, and then use the pressure extraction pipe 72 to connect the discharge flange 71 and the discharge nozzle 70. Since positioning can be performed, there is no need to perform positioning during installation.

 In the casing of the present invention, a discharge nozzle 70 for exchanging the fluid to be handled with the outside of the system, and a detachably mounted outer periphery of the discharge nozzle 70 to fix the discharge nozzle 70 to a system external product. Flange 71, a pressure extraction pipe 72 attached from the outer periphery of the discharge nozzle 70, and an axial end of the discharge nozzle 70, which cannot be attached to or detached from the discharge nozzle 70. A discharge casing 4 that constitutes a casing body fixed to the nozzle is provided, and a pressure extraction pipe 72 is attached to an outer peripheral portion of the discharge nozzle 70. Therefore, the discharge casing 4 and the suction casing 3 can be shared, and the advantage of press molding productivity can be effectively exhibited.

 In one embodiment of the present invention, since the pressure extraction pipe 72 is disposed at a position avoiding the maximum outer diameter portion of the discharge flange 71, the pressure extraction pipe 72 is effectively suppressed. . Since the pressure extraction pipe 72 is in contact with the liquid, an expensive material (stainless steel) is often used. For this reason, shorter pipes are better.

 In one embodiment of the present invention, when the discharge flange 71 is provided with the legs 71L, it is clear that it is effective to position the discharge flange 71 with the pressure extraction pipe 72. That is, if there is no positioning, for example, the position of the frequency converter becomes unstable.

In one embodiment of the present invention, a loose ring for attaching a discharge casing 4 and a suction casing 3 constituting a casing main body to a fluid machine main body composed of a candies 6 and an outer cylinder 2 and the like. There is a casing flange 6 1 and 6 2, and the outer diameter of the discharge flange 7 1 and the suction flange 7 5 is larger than the inner diameter of the casing flanges 6 1 and 6 2. When the casing flanges 6 1 and 6 2 are present, it is highly necessary to attach and detach the discharge flange 71 and the suction flange 5. Di 75 is fixed by screwing, so it can be easily attached and detached.

 5 to 7 are views showing another embodiment of the method of mounting the pressure extracting pipe.

 5 to 7, FIGS. 5A, 6A and 7A are sectional views, and FIGS. 5B, 6B and 7B are top views of the discharge flange. In an example shown in FIG. 5, a notch 71c is formed in the discharge flange 71, and a pressure extraction pipe 72 is inserted through the notch 71c. Other configurations are the same as those shown in FIGS. 1 to 4.

 Also in the example shown in FIG. 6, a notch 71 d is formed in the discharge flange 71, and a pressure extraction pipe 72 is inserted through this notch 7 Id. The direction of the notch 71 d is opposite to that of the example shown in FIG. In the example shown in FIG. 7, a fixed band 76 is attached to the discharge flange 71. A pressure extracting pipe 72 is inserted into the fixed band 76. Other configurations are the same as in the examples shown in FIGS. 1 to 4.

 As described above, according to the present invention, it is possible to provide a casing provided with a pressure extracting means without increasing the external dimensions of a fluid machine.

 Further, according to the present invention, the suction side casing main body and the discharge side casing main body can be shared, and the advantage of press molding productivity can be effectively exhibited. Industrial applicability

 INDUSTRIAL APPLICABILITY The present invention is a casing which can pump various liquids including water under pressure, and is suitably used for a pump used in various building and chemical industries.

Claims

The scope of the claims 1. In a casing used for fluid machinery and containing fluid, a nozzle for transferring the handled fluid to and from the outside of the system, and detachably attached to the outer periphery of the nozzle to fix the nozzle to external components A pressure take-out pipe attached from the outer peripheral side of the nozzle, and a through hole or a notch provided in the flange to guide the pressure take-up pipe to the outer periphery of the flange. Casing for fluid machinery.  2. In a casing that is used for fluid machinery and contains fluid, a nozzle for transferring the handled fluid to and from the outside of the system, and detachably attached to the outer periphery of the nozzle to fix the nozzle to components outside the system A fluid machine casing comprising: a flange; and a pressure extraction pipe attached from an outer peripheral side of the nozzle, wherein the nozzle and the flange are positioned using a pressure extraction pipe.  3. In a casing used for fluid machinery and containing fluid, a nozzle for transferring the handled fluid to and from the outside of the system, and detachably attached to the outer periphery of the nozzle to fix the nozzle to components outside the system A pressure extraction pipe attached from the outer peripheral side of the nozzle, and a casing body provided at the axial end of the nozzle and fixed to the nozzle in a non-detachable manner. A casing for a fluid machine, wherein the casing is mounted on an outer peripheral portion of the casing.  4. The fluid machine according to any one of claims 1 to 3, wherein the nozzle and the flange are detachable by screws provided on an outer periphery of the nozzle and an inner periphery of the flange. For casing. 5. In order to keep the length of the pressure extraction pipe short, the pressure extraction pipe is located at a position avoiding the maximum outer diameter of the flange. The casing for a fluid machine according to any one of claims 1 to 4.  6. The fluid machine casing according to any one of claims 1 to 5, wherein an installation leg is provided on the flange.  7. A loose ring-shaped casing flange for attaching the casing body to the fluid machine body, wherein an outer diameter of the flange is larger than an inner diameter of the casing flange. 7. The casing for a fluid machine according to any one of items 1 to 6.  8. The casing for a fluid machine according to any one of claims 1 to 7, an impeller housed in the casing, a main shaft supporting the impeller, and a rotational drive of the main shaft. A pump comprising: