JP2011080386A - Canned motor pump system and heat transfer device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a canned motor pump system whose pump can continuously be operated and a heat transfer device equipped with the system. <P>SOLUTION: The canned motor pump system 1 comprises a canned motor pump 10, a cooling pipe 29 for conducting a part of a liquid Sw delivered from the canned motor pump 10 to the motor 13m of the canned motor pump 10, and a collection container 20 disposed to the cooling pipe 29. The collection container 20 has a larger flow path cross-section than that of the cooling pipe 29, and is disposed so that its bottom surface is at a lower level than the bottom of the cooling pipe 29B connected downstream of the collection container 20. Thereby, foreign matters can be trapped by the collection container 20. Accordingly, the foreign matters can be avoided from entering a gap between a rotor 13r and a stator 13s to lock the rotor 13r. This results in continued operation of the pump. In the heat transfer device, the canned motor pump system 1 transfers an absorption solution and/or a coolant solution with an absorption refrigerator or a heat pump. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a canned motor pump system and a heat transfer device, and more particularly to a canned motor pump system capable of continuing operation and a heat transfer device including the same.

  There is a canned motor pump in which a rotor and an output shaft of a motor are accommodated in a can. As a measure for continuously operating the canned motor pump, there is one in which a part of the fluid is branched from the discharge pipe and led to the housing through the cooling pipe to improve the cooling and lubrication effect of the motor unit (for example, , See Patent Document 1).

Japanese Patent Laying-Open No. 2005-127334 (paragraph 0037, FIG. 1, etc.)

  A canned motor pump is generally used to convey a contaminant-free fluid in a closed pipe. And a canned motor pump is used also for conveyance of the absorption solution or refrigerant | coolant of an absorption refrigerator or an absorption heat pump. Although the flow path through which the absorption solution or refrigerant of the absorption refrigerator or absorption heat pump circulates is also sealed, there is a situation in which foreign matters such as weld spatter at the time of manufacture and corrosion products of the regenerator are generated. When these foreign substances flow into the motor via the cooling pipe and enter the gap between the stator and the rotor, the rotation of the rotor is hindered (locked), and the pump cannot be operated.

  An object of this invention is to provide the canned motor pump system which can continue the driving | operation of a pump, and a heat transfer apparatus provided with the same in view of the above-mentioned subject.

  In order to achieve the above object, a canned motor pump system according to a first aspect of the present invention includes a canned motor pump 10 and a part of the liquid Sw discharged from the canned motor pump 10, for example, as shown in FIG. A cooling pipe 29 leading to the motor 13m of the canned motor pump 10; a collection container 20 disposed in the cooling pipe 29, having a larger flow path cross section than the cooling pipe 29, and downstream of the collection container 20 And a collection container 20 having a bottom surface lower than the tube bottom of the connected cooling tube 29B.

  If comprised in this way, a foreign material can be caught with a collection container, it can control that a foreign material penetrate | invades in a motor, it can avoid that a rotor locks, and operation of a pump can be avoided. Can continue.

  Moreover, when the canned motor pump system according to the second aspect of the present invention is shown with reference to FIG. 3, for example, in the canned motor pump system according to the first aspect of the present invention, the collection container 20 The cross section is formed in a quadrangle.

  If comprised in this way, the capture rate of the foreign material in a collection container can be improved.

  In addition, the canned motor pump system according to the third aspect of the present invention includes a canned motor pump system according to the first aspect or the second aspect of the present invention, as shown in FIG. In the plan view, the collection container 20 is connected to the cooling pipes 29A and 29B so that the direction in which the liquid flows from the cooling pipe 29A to the collection container 20 and the direction in which the liquid flows from the collection container 20 to the cooling pipe 29B intersect. It is connected.

  If comprised in this way, the capture rate of the foreign material in a collection container can be improved.

  Moreover, the canned motor pump system according to the fourth aspect of the present invention is, for example, as shown in FIG. 3, the canned motor pump system according to any one of the first to third aspects of the present invention. The cooling pipe 29 </ b> B connected to the downstream side of the collection container 20 is inserted into and connected to the collection container 20.

  If comprised in this way, the capture rate of the foreign material in a collection container can be improved.

  Further, for example, as shown in FIG. 2, the heat transfer device according to the fifth aspect of the present invention absorbs the refrigerant vapor Ve in which the refrigerant has become a vapor into the absorption solution Sa to reduce the concentration of the absorption solution Sa. An absorber 31 as a solution Sw; a regenerator 32 that introduces and heats the dilute solution Sw, evaporates the refrigerant from the dilute solution Sw, and generates a concentrated solution Sa that is an absorbent solution having a higher concentration than the dilute solution Sw; A canned motor pump system 1A according to any one of the first to fourth aspects of the present invention that moves the absorbing solution Sw between the absorber 31 and the regenerator 32;

  If comprised in this way, it will become a heat transfer apparatus which can continue a driving | operation even if a foreign material generate | occur | produces in an absorption solution.

  According to the present invention, foreign matter can be captured by the collection container, foreign matter can be prevented from entering the motor, the rotor can be prevented from locking, and the pump can be operated. Can continue.

It is a typical longitudinal section of the canned motor pump system concerning a 1st embodiment of the present invention. It is a typical systematic diagram of the absorption refrigerator which concerns on the 2nd Embodiment of this invention. It is a figure explaining the collection container with which the canned motor pump system which concerns on the 1st Embodiment of this invention is provided. (A) is a plan view, (b) is a left side view, and (c) is a front view. It is a figure which shows the structure of the capture | acquisition container provided in the suction pipe of a canned motor pump. (A) is a longitudinal cross-sectional view, (b) is a BB cross-sectional view in FIG. 4 (a). It is a typical systematic diagram of the test system used for the Example. It is a graph which shows the relationship between the mass of the injected foreign material obtained by the test in an Example, and the mass of the foreign material which became uncollected with the collection container. It is the top view and side view of the collection container of the 1st mode thru / or the 4th mode concerning an example. It is the top view and side view of a collection container of the 5th mode thru / or a 7th mode concerning an example.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same or similar members are denoted by the same or similar reference numerals, and redundant description is omitted.

  First, a canned motor pump system 1 according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic longitudinal sectional view of a canned motor pump system 1. The canned motor pump system 1 includes a canned motor pump 10, a cooling pipe 29 that guides a part of the liquid Sw discharged from the canned motor pump 10 to the motor 13 m of the canned motor pump 10, and the liquid Sw that flows in the cooling pipe 29. And a collection container 20 for capturing the foreign matter. In the present embodiment, the canned motor pump system 1 is incorporated in an absorption refrigerator 30 (see FIG. 2) as a heat transfer device. The heat transfer device referred to here is a device that obtains drive energy such as heat from the outside and transfers heat from a low temperature portion to a high temperature portion or vice versa. A device that transfers heat from a low temperature part to a high temperature part is typically a heat pump in a narrow sense, and a device that transfers heat from a high temperature part to a low temperature part is typically a refrigerator. (Included in the heat pump in a broad sense).

  Here, with reference to FIG. 2, the absorption refrigerator 30 in which the canned motor pump system 1 is incorporated will be described. FIG. 2 is a schematic system diagram of an absorption refrigerator 30 according to the second embodiment of the present invention. The absorption refrigerator 30 evaporates the refrigerant liquid Vf with the heat of the cold water p to generate the refrigerant vapor Ve, and the evaporator 34 that cools the cold water p (hereinafter, the refrigerant vapor generated in the evaporator 34 is “ The evaporator refrigerant vapor Ve generated by the evaporator 34 is absorbed by the concentrated solution Sa, and the absorber 31 absorbs the evaporator refrigerant vapor Ve by the absorber 31 to reduce the concentration. A regenerator 32 that introduces a reduced dilute solution Sw and heats the dilute solution Sw to evaporate the refrigerant to generate a concentrated solution Sa having an increased concentration (hereinafter referred to as “regenerator vapor of refrigerant generated in the regenerator 32”). And a condenser 33 that cools and condenses the regenerator refrigerant vapor Vg evaporated from the dilute solution Sw in the regenerator 32 and generates a refrigerant liquid Vf that is sent to the evaporator 34. Yes. The refrigerant and the absorption solution used in the absorption refrigerator 30 typically use water as the refrigerant and lithium bromide (LiBr) as the absorption solution. However, the refrigerant and the absorption solution are not limited to this, and other refrigerants and absorption solutions (absorption) May be used in combination.

  The evaporator 34 is provided with a chilled water pipe 34a through which chilled water p to be cooled is passed, and takes away latent heat of evaporation from the chilled water p when the refrigerant liquid Vf sprayed from the refrigerant liquid spraying nozzle 34b evaporates. Thus, the cold water p is configured to be cooled. The cold water pipe 34 a is connected to cold water utilization equipment (not shown) such as an air handling unit via a pipe 52. The absorber 31 is provided with a cooling water pipe 31a through which the cooling water q flows, and cools the absorbed heat generated when the concentrated solution Sa sprayed from the concentrated solution spray nozzle 31b absorbs the evaporator refrigerant vapor Ve. The water q is configured to take away. The cooling water pipe 31a is connected to each other via a cooling water pipe 33a and a pipe 53 in the condenser 33, and a cooling tower (not shown) and a pipe 54, respectively. Both the absorber 31 and the evaporator 34 are formed in a shell and tube type in one can body, and a partition wall 31d is provided between them. The absorber 31 and the evaporator 34 communicate with each other at the upper part of the partition wall 31d, and the evaporator refrigerant vapor Ve generated by the evaporator 34 can be moved to the absorber 31.

  A dilute solution tube 55 that guides the dilute solution Sw in the reservoir 31c to the regenerator 32 is connected to the bottom of the absorber 31. The diluted solution pipe 55 is provided with an absorbing solution canned motor pump system 1A as the canned motor pump system 1 that pumps the diluted solution Sw to the regenerator 32. Absorbent solution canned motor pump system 1A is configured to be able to pump dilute solution Sw at a flow rate corresponding to the refrigeration load. A solution heat exchanger 36 that performs heat exchange between the dilute solution Sw and the concentrated solution Sa is disposed in the dilute solution pipe 55 on the downstream side of the absorbing solution canned motor pump system 1A. The solution heat exchanger 36 is also connected with a concentrated solution tube 56 for flowing the concentrated solution Sa. The solution heat exchanger 36 is typically a plate heat exchanger, but may be a shell and tube type or other heat exchanger. On the evaporator 34 side outside the can body constituting the absorber 31 and the evaporator 34, a circulating refrigerant pipe 51 that guides the refrigerant liquid Vf stored in the storage section 34c to the upper refrigerant liquid spray nozzle 34b is disposed. ing. The circulating refrigerant pipe 51 is provided with a refrigerant liquid canned motor pump system 1B as a canned motor pump system 1 that pumps the refrigerant liquid Vf stored in the storage portion 34c to the refrigerant liquid spraying nozzle 34b.

  The regenerator 32 is provided with a heat source fluid pipe 32a through which the heat source fluid F serving as a heating source for heating the dilute solution Sw is disposed, and the refrigerant is evaporated from the dilute solution Sw sprayed from the dilute solution spray nozzle 32b. To produce a concentrated solution Sa. The dilute solution spray nozzle 32 b is connected to the dilute solution tube 55. The condenser 33 is provided with a cooling water pipe 33a through which the cooling water q for cooling the regenerator refrigerant vapor Vg generated in the regenerator 32 flows. One end of the cooling water pipe 33a is connected to the cooling water pipe 31a in the absorber 31 via a pipe 53, and the other end is connected to a cooling tower (not shown) via a pipe 54. Both the condenser 33 and the regenerator 32 are formed in a shell and tube type in one can body, and a partition wall 33d is provided between them. The condenser 33 and the regenerator 32 communicate with each other at the upper part of the partition wall 33 d, and the regenerator refrigerant vapor Vg generated in the regenerator 32 can be moved to the condenser 33. The can body in which the condenser 33 and the regenerator 32 are formed is disposed above the can body in which the absorber 31 and the evaporator 34 are formed, and absorbs the concentrated solution Sa in the regenerator 32. The refrigerant liquid Vf in the condenser 33 can be sent to the evaporator 31 to the evaporator 34 by gravity, respectively. Connected to the bottom of the regenerator 32 is a concentrated solution tube 56 through which the concentrated solution Sa having an increased concentration passes. The concentrated solution tube 56 is connected to the concentrated solution spray nozzle 31b via the solution heat exchanger 36. Connected to the bottom of the condenser 33 is a refrigerant liquid pipe 60 that guides the refrigerant liquid Vf toward the evaporator 34.

  In this embodiment, the absorption refrigerator 30 is described as an example having a single effect, but it goes without saying that it may be a double effect or triple effect absorption refrigerator. Even in the case of double effect or triple effect, the canned motor pump system 1 can be applied as a pump for transporting the absorbing solution and / or the refrigerant liquid. In the absorption refrigerator 30 as described above, spatter in pipe welding at the time of manufacture appears in the flow path after the start of operation, and in particular, the steel material that may be generated in the regenerator 32 is corroded to generate a corrosion product. May occur. When foreign matter occurs, the foreign matter flows into the motor together with the fluid via the cooling pipe provided to cool the canned motor pump, and dust (foreign matter) is caught in the gap between the stator and rotor in the motor. Then the pump stops. Therefore, in the absorption refrigeration machine 30, by providing the canned motor pump system 1, it is possible to prevent foreign matter from flowing into the motor and to allow the canned motor pump to be operated continuously.

  Returning to FIG. 1 again, the canned motor pump system 1 will be described. The canned motor pump 10 is a centrifugal canned motor pump that operates with electric power supplied from outside the apparatus, and includes a casing 12 that houses an impeller 12p and a housing 13 that houses an electric motor 13m. The electric motor 13m includes a rotor 13r and a stator 13s disposed so as to surround the rotor 13r. The rotor 13r and the impeller 12p are connected via a shaft 14 supported by a bearing 14b, and the impeller 12p can be rotated by the rotation of the rotor 13r. The casing 12 is formed with a suction port 12s that opens in the direction in which the shaft 14 extends on the side opposite to the motor 13m, and a discharge port 12d that opens in the radial direction of the impeller 12p. The liquid introduced from the suction port 12s and led out from the discharge port 12d becomes the dilute solution Sw in the case of the absorbing solution canned motor pump system 1A (see FIG. 2), and the liquid in the refrigerant liquid canned motor pump system 1B (see FIG. 2). In this case, the refrigerant liquid Vf is used, but in the following description, the diluted solution Sw is representatively a liquid.

  The cooling pipe 29 has one end connected to the discharge port 12d or downstream of the discharge port 12d so as to take out a part of the diluted solution Sw discharged from the discharge port 12d by the rotation of the impeller 12p. The other end of the cooling pipe 29 is connected to the housing 13 on the side opposite to the side where the casing 12 is located. By providing the cooling pipe 29 in this way, a part of the diluted solution Sw discharged from the discharge port 12d flows into the housing 13 from the side opposite to the side where the casing 12 is located, and the rotor 13r and the stator Passing through 13s, the impeller 12p in the casing 12 is reached. The canned motor pump system 1 is configured to cool the electric motor 13m and the bearing 14b by the flow of the dilute solution Sw as described above.

  The collection container 20 is disposed in the cooling pipe 29. Hereinafter, in order to facilitate the distinction between the cooling pipes 29 connected to the front and rear of the collection container 20, the upstream cooling pipe 29 of the collection container 20 is connected to the upstream cooling pipe 29A and the collection container as necessary. The cooling pipe 29 on the downstream side of 20 is referred to as a downstream cooling pipe 29B. The collection container 20 is formed in a hollow columnar shape (typically a prismatic column shape) having a larger channel cross-section (cross-sectional area in a plane perpendicular to the main flow direction of the dilute solution Sw (fluid)) than the cooling pipe 29. Has been. The collection container 20 is provided at a position where the bottom surface is lower than the tube bottom of the downstream cooling tube 29B. In the present embodiment, the upstream cooling pipe 29A is also provided at the same height as the downstream cooling pipe 29B. In the present embodiment, the upstream cooling pipe 29A and the downstream cooling pipe 29B have the same material and pipe diameter. Moreover, the collection container 20 is formed in the predetermined length. The predetermined length is a length required for the foreign matter flowing into the collection container 20 accompanying the dilute solution Sw to reach below the bottom of the downstream cooling pipe 29B by gravity while moving toward the downstream cooling pipe 29B. It is an arbitrary length greater than or equal to. In FIG. 1, the upstream cooling pipe 29 </ b> A and the downstream cooling pipe 29 </ b> B are shown to be connected to the columnar end faces of the collection container 20, respectively, but such illustration shows the connection order. However, in actuality, it can be connected in various ways depending on the situation. The details around the collection container 20 will be described below.

  FIG. 3 is a view for explaining the collection container 20 provided in the canned motor pump system 1 according to the present embodiment, where (a) is a plan view, (b) is a left side view, and (c) is a front view. is there. The collection container 20 is formed in a rectangular parallelepiped, and the cooling pipe 29 is connected in such a manner that the dilute solution Sw flows horizontally from the connecting part of the upstream cooling pipe 29A toward the connecting part of the downstream cooling pipe 29B. Thus, the collection container 20 has a vertical cross section (a virtual plane orthogonal to the flow direction of the dilute solution Sw) formed in a quadrangular shape. In addition to a rectangular parallelepiped, the collection container 20 may be a hexahedron whose vertical cross section is formed in a quadrangle (for example, a rhombus). The collection container 20 may have a columnar shape with a polygonal vertical section or a columnar shape with a circular or elliptical vertical section, but the present inventor has formed a vertical section in a quadrangular shape (typically a rectangular parallelepiped). It has been found that the trapping rate of foreign matters can be improved.

  The dimension of the collection container 20 can be determined as follows, for example. First, the flow rate of the fluid flowing in the collection container 20 (dilute solution Sw) may be set from the viewpoint of allowing the accompanying foreign substances to fall in the collection container 20 in consideration of the particle size and density. In this embodiment, the flow rate of the dilute solution Sw is set to 0.04 m / s. In this embodiment, the height H and the width W of the collection container 20 are both set to 40 mm in order to determine the flow path cross-sectional area so that the dilute solution Sw has a set flow rate. The length L of the collection container 20 is such that the foreign matter that flows into the collection container 20 from the upstream cooling pipe 29A together with the dilute solution Sw sinks below the bottom of the downstream cooling pipe 29B before reaching the downstream cooling pipe 29B. From the viewpoint of doing so, it may be determined in consideration of free fall of foreign matter, buoyancy, and resistance due to dilute solution Sw. In the present embodiment, when the flow rate of the dilute solution Sw (40 ° C., 58 wt%) in the collection container 20 is 0.04 m / s and the particle size of the foreign matter is about 0.1 mm, Where the length L is preferably 77 mm or more, it is 150 mm. When it is desired to shorten the length L of the collection container 20, the flow path cross-sectional area (width W × height H) is increased and the flow rate of the dilute solution Sw is decreased (the flow path cross-sectional area is reset). Can respond. Moreover, it is preferable to determine the height H and width W of the collection container 20 in consideration of the following matters in addition to the flow rate of the dilute solution Sw. The height H of the collection container 20 may be determined from the viewpoint of allowing the foreign matter captured in the collection container 20 to be retained in the collection container 20 without flowing into the downstream cooling pipe 29B. The outer diameter of the cooling pipe 29B is preferably twice or more. In the present embodiment, when the outer diameter of the cooling pipe 29 is 17.3 mm, the height H of the collection container 20 is 40 mm. The width W of the collection container 20 is preferably at least twice the outer diameter of the downstream cooling pipe 29B, and may be the same as the height H. In consideration of such matters, the height H and width W of the collection container 20 may be larger than values determined in light of the flow path cross-sectional area obtained from the set flow rate of the diluted solution Sw.

  The cooling pipe 29 is connected to the collection container 20 in the plan view in the direction in which the dilute solution Sw flows from the upstream cooling pipe 29A into the collection container 20 (the axial direction of the upstream cooling pipe 29A in the connection portion) and the collection. It may be connected at a position that intersects the direction in which the dilute solution Sw flows out from the container 20 to the downstream cooling pipe 29B (the axial direction of the downstream cooling pipe 29B in the connecting portion), and particularly flows into the collection container 20 from the upstream cooling pipe 29A. Rather than the distance that the dilute solution Sw flows without changing the direction and reaches the inner wall of the collection container 20, the distance that reaches the downstream cooling pipe 29B after colliding with the inner wall and changing the direction toward the downstream cooling pipe 29B. The present inventor has obtained the knowledge that the trapping rate of foreign matters can be improved by connecting to a position where the length becomes longer. Note that “crossing in a plan view” means that both axes of the upstream cooling pipe 29A and the downstream cooling pipe 29B are offset in the vertical direction and do not intersect in a three-dimensional space. In the present embodiment, the upstream cooling pipe 29A is connected to the upper part on the side away from the downstream cooling pipe 29B on the surface in the length direction (the surface where the length L and the height H appear), and the downstream cooling pipe 29B Is connected to the upper part on the side away from the upstream cooling pipe 29A of the surface in the width direction (the surface where the width W and the height H appear). Further, the downstream cooling pipe 29 </ b> B is inserted and connected to the inside of the collection container 20. The present inventor has obtained the knowledge that the foreign substance capture rate can be improved by inserting and connecting the downstream cooling pipe 29B into the collection container 20. The depth Db into which the downstream cooling pipe 29B is inserted may be about the inner diameter of the downstream cooling pipe 29B. In this embodiment, the depth Db is 10 mm where the inner diameter is 12.7 mm. Further, the height at which the downstream cooling pipe 29B is connected to the collection container 20 may be a height at which there is a space where another pipe can be connected below the connected downstream cooling pipe 29B. . Similarly to the downstream cooling pipe 29B, the upstream cooling pipe 29A is inserted into the collection container 20 at the insertion depth of the depth Da, and is connected to the collection container 20 at the same height as the downstream cooling pipe 29B is connected. May be. In the present embodiment, the insertion depth Da and the insertion depth Db have the same dimensions.

  In the collection container 20 configured as described above, the dilute solution Sw flowing into the collection container 20 from the upstream cooling pipe 29A changes its direction after colliding with the inner wall of the opposite collection container 20, and the downstream cooling pipe After flowing through the collection container 20 toward 29B, it flows out of the collection container 20 by flowing into the downstream cooling pipe 29B. At this time, the foreign matter that flows into the collection container 20 along with the dilute solution Sw moves toward the downstream cooling pipe 29B along the flow of the dilute solution Sw, and descends due to free fall. In most cases, the foreign matter descends below the bottom of the downstream cooling pipe 29B by the time it reaches the downstream cooling pipe 29B. Therefore, the dilute solution Sw flows into the downstream cooling pipe 29B and flows out of the collection container 20. While flowing out, the foreign matter remains in the collection container 20. As described above, since the foreign matter can be captured by the collection container 20, it is avoided that the flow path of the dilute solution Sw that may occur when a strainer having a predetermined mesh is inserted into the cooling pipe 29 is generated. Can do. Even when the collection container 20 is used, a foreign substance having a particle size that does not affect the blockage of the flow path of the dilute solution Sw in the canned motor pump 10 (see FIG. 1) flows into the downstream cooling pipe 29B. That is unquestionable.

Although the collection container 20 arranged around the cooling pipe 29 has been described in detail above, a similar capture container 40 (indicated by a broken line in FIG. 1) may be installed in the suction pipe of the canned motor pump.
4A and 4B are diagrams showing the configuration of the capture container 40, wherein FIG. 4A is a longitudinal sectional view, and FIG. 4B is a sectional view taken along line BB in FIG. In the description of the capture container 40, reference will be made to FIGS. 1 and 2 as appropriate. The capture container 40 is disposed upstream of the suction port 12 s of the canned motor pump 10, has a larger channel cross section than the suction port 12 s, and has a bottom surface lower than the lower end of the suction port 12 s (lower end of the channel). Yes. The catching container 40 is configured by attaching a flat lid 42 having an area larger than the opening to both ends of the rectangular tube-shaped main body 41 opened. The main body 41 may be formed in a cylindrical shape other than the rectangular tube shape. The lid 42 is formed with a circular hole 42h corresponding to the inner diameter of the diluted solution tube 55 to be connected. The connection between the lid 42 and the dilute solution tube 55 is typically made by butt welding. The capture container 40 is installed in a direction in which rectangular sides in a cross section perpendicular to the axis of the main body 41 are horizontal and vertical. The foreign matter that has flowed into the capture container 40 mainly accumulates below the effective height He below the apparent height Hs from the bottom surface of the main body 41 to the lower end of the circular hole 42h. Typically, on the basis of the bottom surface of the main body 41, the volume obtained by multiplying the area of the bottom surface of the main body 41 by the effective height He is 70% or less of the volume obtained by multiplying the apparent height Hs. This height may be determined as the effective height He. In other words, the circular hole 42h may be formed at a position where the apparent height Hs and the effective height He have the above relationship.

  The absorption refrigerator has a circumstance that an absorption solution and a refrigerant that perform a refrigeration cycle circulate in a negative pressure environment. Since the liquid is more likely to evaporate as the pressure is lower, in order to avoid the occurrence of cavitation, the pump for carrying the absorption solution and the refrigerant for performing the refrigeration cycle is generally set so that the flow rate of the suction pipe becomes relatively small. . In addition, the capture container 40 installed on the upstream side of the canned motor pump 10 is a target for capturing large foreign matter with respect to the collection container 20 installed on the downstream side. In consideration of such circumstances, in the present embodiment, the nominal diameter of the dilute solution tube 55 is 1/1/4 B, and the flow rate of the dilute solution Sw (40 ° C., 58 wt%) flowing into the suction port 12s is 1 m / s, assuming that the particle size of the foreign material is about 3.0 mm, the body 41 of the capture container 40 is a square tube having a length of 100 mm and a square whose axis perpendicular to the axis is 70 mm on one side. Is formed so as to be located at the center of the square of the cross section of the main body 41, thereby obtaining a trapping container 40 capable of trapping about 200 g of foreign matter. When the nominal diameter of the dilute solution tube 55 is 6B, the length of the square tube of the main body 41 may be 200 mm, and when the nominal diameter of the dilute solution tube 55 is any one of 1/1 / 4B to 6B, The length of the square tube of the main body 41 may be proportionally designed between 100 mm and 200 mm.

  By providing the capture container 40 in the canned motor pump system 1, foreign matter having a large particle diameter is captured by the capture container 40, so that the impeller 12p of the canned motor pump 10 can be protected, and a strainer having a predetermined mesh is temporarily assumed. It is possible to avoid the clogging of the flow path of the dilute solution Sw that may occur when the is inserted upstream of the suction port 12s, and it is possible to prevent the pump cavitation due to the flow resistance of the strainer. At this time, a small-diameter foreign substance that does not adversely affect the impeller 12p may flow downstream of the canned motor pump 10, but among these, a foreign substance having a relatively large particle diameter passes through the main pipe (dilute solution pipe 55) due to inertia. It flows and does not enter the cooling pipe 29. On the other hand, a foreign substance having a relatively small particle diameter may enter the cooling pipe 29. However, since the collection container 20 is disposed in the cooling pipe 29 as described above, the rotor 13r in the canned motor pump 10 is disposed. In addition, dust (foreign matter) is not caught in a gap such as between the stators 13s.

  In the above description, the heat transfer device is the absorption refrigerator 30, but it may be a narrowly defined heat pump that pumps up heat. In the case of a heat pump, the canned motor pump system provided on the absorption solution side conveys the concentrated solution from the regenerator to the absorber.

  In the above description, the downstream cooling pipe 29B is inserted and connected to the collection container 20, but instead of being inserted, from the inner wall of the collection container 20 at the lower end of the connection portion of the downstream cooling pipe 29B. It is good also as installing the baffle plate extended inside the collection container 20. FIG. The same applies to the upstream cooling pipe 29A.

Hereinafter, the relationship between the configuration of the collection container 20 and the collection of foreign substances will be described through examples. The examples described below were performed with a test system configured to be used for testing.
FIG. 5 shows the configuration of the test system 100. The test system 100 includes a pump 110 simulating a canned motor pump, a flow control valve 198, a collection container 120 for testing simulating a collection container 20 (see FIG. 1), a strainer 191, a flow meter 192, and a tank 193. A circulation flow path was constructed by connecting the pipes 129 in an annular shape in this order. Then, a foreign substance input pipe 194 was connected to the pipe 129 between the flow control valve 198 and the collection container 120. The pipe 194 is provided with two valves 195 and 196 in series so that foreign substances can be charged in batches (a predetermined amount of batches). The pump 110 having the motor capacity of 2.2 kW, the collecting container 120 having various conditions described later, the strainer 191 having a trapping particle diameter of 0.45 mm, and the pipe 129 having an inner diameter of 12 mm, each having the above configuration. Using. In the test system 100, water is circulated as a test fluid at a rate of about 10 L / min by adjusting the flow rate control valve 198, and a steel grid having a particle size of 0.5 mm to 1.0 mm (average particle size 0.7 mm) as foreign matter. (Hardness 40-50HRc) was charged in batches.

  As an evaluation method, about 10 minutes after putting a predetermined amount of foreign matter, the foreign matter in the collection container 120 and the strainer 191 was taken out and dried, and then the respective masses were measured. This was repeated until the foreign matter captured by the strainer 191 exceeded 0.3 g, and the evaluation was made based on how many g of foreign matter had been put into the test system 100 so far. That is, the larger the amount of foreign matter that has been introduced into the test system 100 until the foreign matter captured by the strainer 191 exceeds 0.3 g, the more foreign matter has been captured by the collection container 120. Further, the foreign matter captured by the strainer 191 was rubbed with a 0.6 mm net, and the amount of foreign matter of 0.6 mm or more was measured. This is because the foreign matter of less than 0.6 mm does not cause the rotor to be locked in consideration of the gap between the rotor 13r and the stator 13s of the canned motor pump 10 (see FIG. 1) when applied to the canned motor pump system 1. It is estimated.

  In the above test, in order to formulate the optimum configuration of the collection container 120 for the connection of the pipe 129, the collection container 120 of seven aspects was targeted. Hereinafter, in order to distinguish each aspect of the collection container 120, a 1st structure is represented by the code | symbol 121, a 2nd structure is represented by the code | symbol 122, and the same one-digit number of a code | symbol is changed sequentially similarly below. The seventh configuration is represented by reference numeral 127.

  FIG. 6 shows the results of the above test, and FIGS. 7 and 8 show the configurations of the collection containers 121-127. FIG. 6 is a graph showing the test results in terms of the relationship between the mass of the introduced foreign matter and the mass of the foreign matter captured by the strainer 191, and FIG. 6 (a) shows the four collection containers 121 to 124. The results are shown in FIG. 6B as four results of the collection container 124 to the collection container 127. In the figure, the horizontal axis represents “the mass of the introduced foreign matter” and the vertical axis represents “the mass of the foreign matter trapped by the strainer 191” (in other words, the amount of foreign matter not collected by the collection container 120). . Since the collection container 124 is configured to be one branch point, the result is shown in both graphs. The scales of the horizontal axes of both graphs are different.

  FIG. 7A is a plan view of the collection container 121, and FIG. 7B is a side view of the collection container 121. The collection container 121 is a rectangular parallelepiped having a length L of 150 mm, a width W of 30 mm, and a height H of 30 mm. As for the connection position of the pipe 129 to the collection container 121, both the inlet-side pipe 129A and the outlet-side pipe 129B are connected to square surfaces at both ends, and are connected to the center of the width W in plan view. A baffle plate 121p having the same width as the width W of the collection container 121 and a depth of 25 mm is horizontally attached to the lower end portion of the pipe 129 inside the collection container 121. The test result of the collection container 121 configured as described above is that the uncollected amount (amount captured by the strainer 191) when 5 g of foreign matter is charged is 0, as indicated by a result R121 in FIG. 0.5 g, of which the particle diameter was 0.6 mm or more was 0.3 g.

  FIG. 7C is a plan view of the collection container 122, and FIG. 7D is a side view of the collection container 122. The collection container 122 is a rectangular parallelepiped having a length L of 150 mm, a width W of 30 mm, and a height H of 30 mm. The connection position of the pipe 129 to the collection container 122 is connected to the square surfaces of both ends of the pipe 129A on the inlet side and the pipe 129B on the outlet side. In plan view, the inlet-side pipe 129A is connected to one end of the width W, and the outlet-side pipe 129B is connected to the end of the width W opposite to the inlet-side pipe 129A. Has been. Further, a baffle plate 122 p having the same width W as the collection container 122 and a depth of 25 mm is horizontally attached to the lower end portion of the pipe 129 inside the collection container 122. As shown by the result R122 in FIG. 6 (a), the test result of the thus configured collection container 122 is that the amount of uncollected when 10 g of foreign matter is added is 0.6 g, of which the particle size is The thing of 0.6 mm or more was 0.3 g.

  FIG. 7E is a plan view of the collection container 123, and FIG. 7F is a side view of the collection container 123. The collection container 123 is a rectangular parallelepiped having a length L of 150 mm, a width W of 40 mm, and a height H of 40 mm. The connection position of the pipe 129 to the collection container 123 is connected to the square surfaces at both ends of the pipe 129A on the inlet side and the pipe 129B on the outlet side. In plan view, the inlet-side pipe 129A is connected to one end of the width W, and the outlet-side pipe 129B is connected to the end of the width W opposite to the inlet-side pipe 129A. Has been. The inlet side pipe 129 </ b> A is inserted and connected to the inside of the collection container 123 by 10 mm, and the outlet side pipe 129 </ b> B is inserted and connected to the inside of the collection container 123 by 25 mm. As shown by the result R123 in FIG. 6A, the test result of the thus configured collection container 123 is that the amount of uncollected when 15 g of foreign matter is introduced is 0.5 g, of which the particle size is The thing of 0.6 mm or more was 0.3 g.

  FIG. 7G is a plan view of the collection container 124, and FIG. 7H is a side view of the collection container 124. The collection container 124 is a rectangular parallelepiped having a length L of 150 mm, a width W of 40 mm, and a height H of 40 mm. The connection position of the pipe 129 to the collection container 124 is such that the inlet-side pipe 129A is connected to a square surface, and the outlet-side pipe 129B is connected to a rectangular surface. In plan view, the inlet-side pipe 129A is connected to the end of the width W opposite to the surface to which the outlet-side pipe 129B is connected, and the outlet-side pipe 129B is connected to the inlet-side pipe 129A. Are connected to the end of the length L on the opposite side of the surface to which is connected. Further, both the inlet-side pipe 129A and the outlet-side pipe 129B are inserted and connected to the inside of the collection container 124. As shown by a result R124 in FIG. 6, the test result of the thus configured collection container 124 is that the amount of uncollected when 30 g of foreign matter is charged is 0.4 g, of which the particle size is 0.6 mm. The above was 0.2 g.

Although the test result about the four collection containers 121-124 was seen so far, the following knowledge was acquired from the result so far.
(1) The foreign matter capture rate is improved when the inlet side pipe 129A and the outlet side pipe 129B are offset without matching the axes in plan view.
(2) The greater the cross-sectional area of the channel (the area of the square surface), the better the foreign matter catching rate, and the better the foreign matter catching rate when the piping is inserted into the collection container and connected.
(3) The foreign matter capture rate of the inlet-side pipe 129 </ b> A and the outlet-side pipe 129 </ b> B is improved when the axes intersect (perpendicular) rather than being parallel in plan view.
Based on the above findings, test results are shown below for another aspect of the collection container in which the axes of the pipe 129A and the pipe 129B intersect in plan view. As for the shape of the collection container 120, since it has been found in a preliminary test that a rectangular parallelepiped has a higher capture rate of foreign matter than a cylindrical one (a cross section perpendicular to the axis is circular), the explanation here However, a cylindrical shape is also included in the scope of the present invention without departing from the gist of the present invention.

  FIG. 8A is a plan view of the collection container 125, and FIG. 8B is a side view of the collection container 125. The collection container 125 is a rectangular parallelepiped having a length L of 150 mm, a width W of 40 mm, and a height H of 40 mm. The connection position of the pipe 129 to the collection container 125 is such that the inlet-side pipe 129A is connected to a rectangular surface, and the outlet-side pipe 129B is connected to a square surface. In plan view, the inlet-side pipe 129A is connected to the end of the length L on the opposite side to the surface to which the outlet-side pipe 129B is connected, and the outlet-side pipe 129B is connected to the inlet-side pipe 129B. It is connected to the end of the width W opposite to the surface to which 129A is connected. Further, both the inlet-side pipe 129A and the outlet-side pipe 129B are inserted and connected to the inside of the collection container 125. As shown by the result R125 in FIG. 6B, the test result of the collection container 125 configured as described above was 0.1 g of uncollected until 120 g of foreign matter was charged. And when 150g of foreign materials were thrown in, the uncollected amount was 0.7g, and the thing with a particle size of 0.6 mm or more was 0.5g.

  FIG. 8C is a plan view of the collection container 126, and FIG. 8D is a side view of the collection container 126. The collection container 126 is a rectangular parallelepiped having a length L of 150 mm, a width W of 40 mm, and a height H of 40 mm. The connection position of the pipe 129 to the collection container 126 is such that the inlet-side pipe 129A is connected to a square surface, and the outlet-side pipe 129B is connected to a rectangular surface. In plan view, the inlet side pipe 129A is connected to the end of the width W on the surface side to which the outlet side pipe 129B is connected, and the outlet side pipe 129B is connected to the inlet side pipe 129A. It is connected to the end of the length L on the opposite side of the surface. Further, both the inlet-side pipe 129A and the outlet-side pipe 129B are inserted and connected to the inside of the collection container 126. As shown by a result R126 in FIG. 6B, the test result of the collection container 126 configured in this manner is 0.7 g of uncollected when 10 g of foreign matter is charged, and the particle size of which is 0.7 g. The thing of 0.6 mm or more was 0.2 g.

  FIG. 8E is a plan view of the collection container 127, and FIG. 8F is a side view of the collection container 127. The collection container 127 is a rectangular parallelepiped having a length L of 150 mm, a width W of 40 mm, and a height H of 40 mm. As for the connection position of the pipe 129 to the collection container 127, the pipe 129A on the inlet side is connected to a rectangular surface, and the pipe 129B on the outlet side is connected to a square surface. In plan view, the inlet-side pipe 129A is connected to the end of the length L on the opposite side to the surface to which the outlet-side pipe 129B is connected, and the outlet-side pipe 129B is connected to the inlet-side pipe 129B. 129A is connected to the end of the width W on the surface side to which 129A is connected. Both the inlet-side pipe 129 </ b> A and the outlet-side pipe 129 </ b> B are connected by being inserted 10 mm into the collection container 127. As shown by the result R127 in FIG. 6 (b), the test result of the collection container 127 configured in this way is an uncollected amount when 20 g of foreign matter is added, and the particle size of which is 0.5 g. The thing of 0.6 mm or more was 0.4 g.

  From the above results, it was found that the shape of the collection container 125 shown in FIGS. 8A and 8B has the highest foreign matter capture rate. That is, in plan view, the inlet-side pipe 129A is connected to the end of the length L opposite to the surface to which the outlet-side pipe 129B is connected, and the outlet-side pipe 129B is connected to the inlet-side pipe 129A. It was found that the trapping rate of the foreign matter of the collecting container 125 shaped so as to be connected to the end of the width W opposite to the connected surface is remarkably high.

DESCRIPTION OF SYMBOLS 1 Canned motor pump system 1A Absorption solution canned motor pump system 1B Refrigerant liquid canned motor pump system 10 Canned motor pump 13m Motor 20 Collection container 29 Cooling pipe 31 Absorber 32 Regenerator Sa Concentrated solution Sw Dilute solution Ve Evaporator refrigerant vapor

Claims (5)

With a canned motor pump;
A cooling pipe for guiding a part of the liquid discharged from the canned motor pump to the motor of the canned motor pump;
A collection container disposed in the cooling pipe, having a larger flow path cross section than the cooling pipe, and having a bottom surface lower than a bottom of the cooling pipe connected to the downstream side of the collection container. A separate collection container;
Canned motor pump system. The collection container has a vertical cross section formed into a quadrangle;
The canned motor pump system according to claim 1. The collection container is connected to the cooling pipe so that a direction in which the liquid flows from the cooling pipe to the collection container and a direction in which the liquid flows from the collection container to the cooling pipe intersect in a plan view. Was;
The canned motor pump system according to claim 1 or 2. The cooling pipe connected to the downstream side of the collection container was inserted and connected to the inside of the collection container;
The canned motor pump system according to any one of claims 1 to 3. An absorber that absorbs the refrigerant vapor, which has become a vapor, into the absorbing solution to make the absorbing solution a dilute solution having a reduced concentration;
A regenerator that introduces and heats the dilute solution to evaporate a refrigerant from the dilute solution to produce a concentrated solution that is an absorbent solution having a higher concentration than the dilute solution;
A canned motor pump system according to any one of claims 1 to 4, wherein the absorbing solution is moved between the absorber and the regenerator;
Heat transfer device.

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