JP2010007903A - Heat pump and internal inspection method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat pump having a structure inspecting inside of can barrels in a wide range and preventing corrosion of the can barrels due to the atmosphere, and an internal inspection method of the heat pump. <P>SOLUTION: The heat pump is provided with the plurality of can barrels 50 forming an absorber, an evaporator, a regenerator and a condenser, respectively; a nitrogen gas introduction part 51 communicated with the plurality of can barrels 50; an endoscope insertion part 55 mounted to any of the plurality of can barrels 50 and having a passage 55a communicated with the can barrel 50; a fitting member 60 having a throughhole 65 communicated with the passage 55a of the endoscope insertion part 55; and a valve 56 provided on the passage 55a of the endoscope insertion part 55. The through-hole 55 has a diameter slightly larger than the outer diameter of an endoscope 59. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a heat pump and an internal inspection method thereof, and more particularly to an absorption heat pump having a configuration suitable for internal inspection of a pressure vessel (can body) forming an absorber, a regenerator, and the like and an internal inspection method thereof.

  Absorption refrigerators and absorption heat pumps (hereinafter collectively referred to as absorption heat pumps) using an aqueous salt solution such as LiBr (lithium bromide) as an absorbent generally include an absorber, an evaporator, a regenerator, and a condenser. It is provided as a main component device. An airtight container called a shell (shell) that forms an absorber or regenerator has an inspection hole for internal inspection, and the inspector visually inspects the inside of the can body through this inspection hole. Check for corrosion.

  However, since the inspection hole is smaller than the size of the can body, it is difficult to sufficiently inspect the inside of the can body. For example, in the case of an absorption heat pump having an evaporator capacity of 100 to 2000 refrigeration tons, the diameter of the can body is several hundred mm to several thousand mm, and its length is several thousand mm. On the other hand, the diameter of the inspection hole is about 500 mm. For this reason, the range that can be directly inspected with the naked eye through the inspection hall is limited, and many areas that cannot be inspected remain. Furthermore, during the inspection, there is a concern that air enters the can body and the corrosion of the internal metal progresses.

JP 2006-112686 A JP 2000-171119 A

  The present invention has been made in view of the above-described conventional problems, and it is possible to inspect the interior of the can body over a wide range, and further to prevent corrosion of the can body due to the atmosphere, and the internal inspection thereof. It aims to provide a method.

  In order to achieve the above-described object, one aspect of the present invention includes a plurality of can bodies that respectively form an absorber, an evaporator, a regenerator, and a condenser, and a nitrogen gas introduction unit that communicates with the plurality of can bodies. An endoscope insertion portion attached to one of the plurality of can bodies and having a passage communicating with the can body; and a fitting member having a through hole communicating with the passage of the endoscope insertion portion; And a valve provided in the passage of the endoscope insertion portion, wherein the through hole has a diameter slightly larger than an outer diameter of the endoscope.

In a preferred aspect of the present invention, the fitting member is detachably attached to the endoscope insertion portion.
In a preferred aspect of the present invention, a guide member for guiding the endoscope is provided inside the can body to which the endoscope insertion portion is attached.

  In another aspect of the present invention, nitrogen gas is supplied to the can body of the heat pump to fill the can body with nitrogen gas, and the endoscope is inserted into a through hole having a diameter slightly larger than the outer diameter of the endoscope. And opening a valve provided in a passage connecting the through hole and the can body, and inserting the endoscope into the can body through the valve and the passage, and while opening the valve, An internal inspection method for a heat pump, characterized in that the pressure of nitrogen gas filling the can body is maintained at a pressure higher than that of the surrounding atmosphere.

  According to the present invention, the inspector can inspect a wide range inside the can body using the endoscope. Furthermore, since the inspection work is performed while filling the inside of the can body with nitrogen gas, the atmosphere does not enter the inside of the can body. Therefore, corrosion of the can body caused by contact with the atmosphere can be prevented.

  Hereinafter, embodiments of the present invention will be described. FIG. 1 is a diagram illustrating a configuration example of a two-stage temperature rising type absorption heat pump according to an embodiment of the present invention. As shown in FIG. 1, the two-stage temperature rising type absorption heat pump is composed mainly of a high temperature absorber AH, a low temperature absorber A, a high temperature evaporator EH, a low temperature evaporator E, a regenerator G, a condenser C, and a high temperature solution. A heat exchanger X2 and a low temperature solution heat exchanger X1 are provided.

  The concentrated solution of the regenerator G is introduced into the high temperature absorber AH by the solution pump 1 through the concentrated solution tube 2, the heated side of the low temperature solution heat exchanger X1, and the heated side of the high temperature solution heat exchanger X2. It has become. The condensed refrigerant liquid in the condenser C is introduced by the refrigerant pump 3 through the refrigerant pipe 4 and the control valve 5 into the low temperature evaporator E, and through the refrigerant pipe 4 and the control valve 6 into the high temperature evaporator EHS. ing. The refrigerant vapor generated in the low temperature evaporator E is introduced into the low temperature absorber A through the flow path 7, and the refrigerant vapor generated in the high temperature evaporator EHS is introduced into the high temperature absorber AH through the flow path 8. It has become.

  The spray 9 is disposed in the high temperature absorber AH, and the concentrated solution introduced by the concentrated solution tube 2 is sprayed from the spray 9 into the high temperature absorber AH and absorbs and absorbs the refrigerant vapor from the high temperature evaporator EHS. At the same time as the heat is generated, the concentrated solution becomes a medium concentration solution, and the concentrated solution passing through the concentrated solution tube 2 through the medium concentration solution tube 10 and the heating side of the high temperature solution heat exchanger X2 is heated. 11 and the control valve 12 are introduced into the cold absorber A. The introduced intermediate concentration solution and the concentrated solution branched and introduced by the branch pipe 26 are mixed and sprayed from the spray 13 disposed in the low temperature absorber A, and the refrigerant vapor from the low temperature evaporator E is mixed. It absorbs and emits heat of absorption, and becomes a dilute solution.

  The dilute solution in the low temperature absorber A is introduced into the regenerator G through the dilute solution pipe 14 and the heating side of the low temperature solution heat exchanger X1, and the regenerator is supplied from the spray 15 provided in the regenerator G. It is spread | dispersed on the hot water pipe | tube 16 arrange | positioned in G. The sprayed dilute solution is heated by the hot water 203 supplied to the hot water pipe 16, and refrigerant vapor is generated and concentrated to become a concentrated solution. The generated refrigerant vapor is introduced into the condenser C through the flow path 17 and is cooled and condensed by the cooling water 204 passing through the cold water pipe 18 disposed in the condenser C to be a condensed refrigerant liquid.

  Inside each of the low temperature absorber A and the high temperature evaporator EHS, heat exchange pipes 20 and 21 are arranged, and the heat exchange pipes 20 and 21 are connected to the working medium transport pipes 19 and 19 for circulation. The working medium circulates through the heat exchange pipes 20 and 21 by the pump 22. Due to the circulation of the working medium, the heat generated in the low temperature absorber A is sent to the high temperature evaporator EHS. A spray 23 is disposed in the high-temperature evaporator EHS, and a refrigerant liquid introduced through the control valve 6 is supplied to the spray 23 and circulated. Further, the refrigerant liquid in the high-temperature evaporator EHS is also supplied to the spray 23 by the refrigerant pump 24. By spraying the refrigerant liquid from the spray 23 onto the heat exchanging pipe 21, the refrigerant liquid is heated and evaporated by the working medium circulating in the heat exchanging pipe 21, and the evaporated refrigerant vapor flows as described above. It is introduced into the high-temperature absorber AH through the path 8.

  Further, a hot water pipe 25 is disposed in the low temperature evaporator E, the refrigerant liquid in the low temperature evaporator E is heated by the hot water supplied to the hot water pipe, and the generated refrigerant vapor is absorbed at a low temperature as described above. Introduced into vessel A. Further, the concentrated solution sent through the concentrated solution pipe 2 is heated through the heated side of the low temperature solution heat exchanger X1, and then partially branched by the branch pipe 26 and introduced into the low temperature absorber A. It has become. The flow rate of the concentrated solution to be introduced is restricted by the orifice 27.

  The high temperature absorber AH is provided with a liquid level sensor 28 for detecting the liquid level, and a detection signal of the liquid level sensor 28 is input to the inverter 29 so that the rotational speed of the solution pump 1 can be controlled. ing. Further, the low-temperature absorber A is provided with a liquid level sensor 30 for detecting the outlet liquid level, and a detection signal of the liquid level sensor 30 is input to the control valve 12 so that the opening degree can be controlled. . Further, the low-temperature evaporator E is provided with a liquid level sensor 31 for detecting the liquid level, and a detection signal of the liquid level sensor 31 is input to the control valve 5 so that the opening degree can be controlled. Further, the high temperature evaporator EHS is provided with a liquid level sensor 32 for detecting the liquid level, and a detection signal of the liquid level sensor 32 is inputted to the control valve 6 so that the opening degree thereof can be controlled.

  A pipe 33 for supplying water as a medium to be heated is disposed in the high-temperature absorber AH. Water is supplied from the gas-liquid separator 35 to the pipe 33 by the pump 34 and heated, and the generated steam passes through the pipe 36. Then, it is guided to the gas-liquid separator 35 and the steam 201 is supplied from the steam discharge pipe 37 to the steam usage destination. The gas-liquid separator 35 is supplied with water 202 as a heating medium through a water supply pipe 39 by a water supply pump 38. Water 202 passing through the water supply pipe 39 is heated by the heat exchanger 40 with hot water 203 passing through the hot water pipe 41, heated by the dilute solution passing through the dilute solution pipe 14 by the heat exchanger 42, and introduced into the gas-liquid separator 35. It has come to be. The gas-liquid separator 35 is provided with a liquid level sensor 43 for detecting the liquid level, and the detection signal is input to an inverter of a feed water pump 38 driven by an inverter (not shown), for example, so that the pump rotation speed can be controlled. It has become.

  In the two-stage temperature rising absorption heat pump configured as described above, hot water 203 as a heat source is supplied to the hot water pipe 16 of the regenerator G and the hot water pipe 25 of the low temperature evaporator E, and cooling water 204 is supplied to the cold water pipe of the condenser C. Thus, steam having a temperature higher than that of the hot water of the heat source can be obtained on the heated side of the high-temperature absorber AH.

  Next, a mechanism for checking the inside of the can body forming the high temperature absorber AH, the high temperature evaporator EHS, and the like will be described. FIG. 2 is a schematic diagram illustrating a mechanism for inspecting the can body of the two-stage temperature rising type absorption heat pump. In FIG. 2, the code | symbol 50 represents the metal can body (sealed container) which forms the high temperature absorber AH, the high temperature evaporator EHS, etc. FIG. As shown in FIG. 2, the can body 50 is attached with a nitrogen gas introducing portion 51 communicating with the internal space. The passage of the nitrogen gas introduction part 51 can be freely opened and closed by a valve 52. When inspecting the can body 50, the nitrogen gas introduction part 51 is connected to the nitrogen gas supply source 53.

  An endoscope insertion portion 55 is further attached to the can body 50. FIG. 3 is an enlarged cross-sectional view showing the endoscope insertion portion 55. As shown in FIG. 3, the endoscope insertion portion 55 has a passage 55 a that communicates with the can body 50. A ball valve 56 is disposed in the passage 55a, and the passage 55a is opened and closed by rotating the ball valve 56. The opening end portion (end portion of the passage 55 a) of the endoscope insertion portion 55 is closed by a lid 57. The lid 57 is provided to prevent high-pressure steam inside the can body 50 from leaking to the outside due to an erroneous operation of the ball valve 56 or the like during operation of the heat pump. Thus, the ball valve 56 and the lid 57 constitute a double closing structure.

  The lid 57 is detachably attached to the endoscope insertion portion 55, and the lid 57 is removed from the endoscope insertion portion 55 when the can body 50 is inspected. Then, instead of the lid 57, a fitting member 60 shown below is attached to the opening end of the endoscope insertion portion 55.

4A is an enlarged cross-sectional view showing a state where the fitting member 60 is attached to the endoscope insertion portion 55, and FIG. 4B is a fitting member viewed from the direction of the arrow IV shown in FIG. 4A. FIG. FIG. 4A shows a state where the ball valve 56 is opened.
The fitting member 60 is attached to the opening end portion of the endoscope insertion portion 55. More specifically, the end of the fitting member 60 is screwed into the opening end of the endoscope insertion portion 55, and the fitting member 60 and the endoscope insertion portion 55 are connected in an airtight manner. The fitting member 60 includes a pair of flange-shaped support members 61 and a ring member 62 sandwiched between the support members 61. The ring member 62 has a through hole 65 that communicates with the passage 55 a of the endoscope insertion portion 55. The through hole 65 has a diameter slightly larger than the outer diameter of the endoscope 59, and the endoscope 59 is inserted into the through hole 65.

  The ring member 62 is made of resin. The inner peripheral surface of the ring member 62 has a semicircular cross section so that the endoscope 59 can easily move in the longitudinal direction. Furthermore, it is preferable to cover at least the inner peripheral surface of the ring member 62 with Teflon (registered trademark) so that the endoscope 59 can easily move. The diameter of the through hole 65 is determined according to the size of the endoscope 59 used. A plurality of fitting members having through holes with different diameters may be prepared so as to be compatible with endoscopes of different sizes. Examples of endoscopes used include commercially available endoscopes such as industrial fiberscopes.

  At the time of inspection, the ball valve 56 is operated to open the passage 55a of the endoscope insertion portion 55, and the endoscope 59 is inserted into the can body 50 through the opening of the ball valve 56 and the passage 55a. The valve disposed in the passage 55a is preferably a valve that forms a linear opening when the valve is opened so that the endoscope 59 can easily move. Furthermore, it is preferable that the high-pressure steam can be reliably prevented from leaking when the valve is closed. From such a viewpoint, a ball valve is preferably used. Other valves that can be used include gate valves.

  Another example of the fitting member is a sleeve-like fitting member 60 as shown in FIG. Also in this example, the end of the fitting member 60 is screwed into the opening end of the endoscope insertion portion 55, and the fitting member 60 and the endoscope insertion portion 55 are connected in an airtight manner. Similarly, the fitting member 60 has a through hole 65 communicating with the passage 55 a of the endoscope insertion portion 55, and the diameter of the through hole 65 is slightly larger than the outer diameter of the endoscope 59.

  Next, a method for inspecting the inside of the can body 50 will be described. First, the nitrogen gas introduction part 51 is connected to the nitrogen gas supply source 53, the valve 52 is opened, and nitrogen gas is supplied from the nitrogen gas supply source 53 to the can body 50. The supply pressure of nitrogen gas is set higher than the pressure of the surrounding atmosphere. Next, the lid 57 is removed, and the fitting member 60 is attached to the endoscope insertion portion 55. The endoscope 59 is inserted into the through hole 65 of the fitting member 60, and the ball valve 56 is opened in this state. Then, the endoscope 59 is inserted into the can body 50 through the ball valve 56 and the passage 55 a, and the inside of the can body 50 is inspected using the endoscope 59.

  While the ball valve 56 is open, the internal pressure of the can body 50 is maintained higher than the ambient pressure (generally atmospheric pressure). Thereby, the nitrogen filling the inside of the can body 50 leaks to the outside through a minute gap between the through hole 65 of the fitting member 60 and the endoscope 59. This leaking nitrogen gas prevents ambient air from entering the can body 50, thereby preventing corrosion inside the can body 50.

  A guide member may be provided inside the can body 50 so that the endoscope 59 can proceed smoothly in the can body 50. For example, as shown in FIGS. 6A and 6B, a plurality of hook-shaped guide members 67 can be attached to the inner surface of the can body 50. The plurality of guide members 67 are arranged at a certain interval so as not to obstruct the field of view of the endoscope 59. By arranging such a guide member 67 inside the can body 50, the endoscope 59 can be sent to a desired position of the can body 50.

  After the inspection of the can body 50 is completed, the endoscope 59 is pulled out from the can body 50 and the ball valve 56 is closed. Next, the supply of nitrogen gas is stopped. Then, the fitting member 60 is removed from the endoscope insertion portion 55, and a lid 57 is attached to the opening end portion of the endoscope insertion portion 55. Immediately after the inspection work, since the inside of the can body 50 is filled with nitrogen gas, before starting the operation of the heat pump, a vacuum pump or the like is connected to the can body 50 and the nitrogen gas is removed from the can body 50. Exhaust.

  A plurality of endoscope insertion portions 55 can be provided per can body. Moreover, you may provide the endoscope insertion part 55 in each of the some can body 50. FIG. Even in this case, only one nitrogen gas introducing portion 51 is required. This is because the plurality of can bodies 50 communicate with each other through piping. As the can body to be inspected, in the two-stage temperature rising type absorption heat pump shown in FIG. 1, the can body of the high temperature absorber AH or the high temperature evaporator EHS that becomes high pressure during operation is selected. On the other hand, in a triple effect absorption refrigerator having a high temperature regenerator, a medium temperature regenerator, a low temperature regenerator, a condenser, an absorber, and an evaporator as main components (see Patent Document 1), as a can body to be inspected A high temperature regenerator with high pressure is selected. Thus, this embodiment can be applied to various types of heat pumps.

  The embodiment described above is described for the purpose of enabling the person having ordinary knowledge in the technical field to which the present invention belongs to implement the present invention. Various modifications of the above embodiment can be naturally made by those skilled in the art, and the technical idea of the present invention can be applied to other embodiments. Therefore, the present invention should not be limited to the described embodiments, but should be the widest scope according to the technical idea defined by the claims.

It is a figure which shows the structural example of the two-stage temperature rising type absorption heat pump which concerns on one Embodiment of this invention. It is a schematic diagram explaining the mechanism for inspecting the can body of a two-step temperature rising type absorption heat pump. It is an expanded sectional view showing an endoscope insertion part. 4A is an enlarged cross-sectional view showing a state where the fitting member is attached to the endoscope insertion portion, and FIG. 4B shows the fitting member viewed from the direction of arrow IV shown in FIG. FIG. It is sectional drawing which shows the other example of a fitting member. FIG. 6A is a view showing an example in which a plurality of guide members are attached to the inner surface of the can body, and FIG. 6B is a view of the guide members as seen from the direction of the arrow VI.

Explanation of symbols

AH High temperature absorber A Low temperature absorber EH High temperature evaporator E Low temperature evaporator G Regenerator C Condenser X1 Low temperature solution heat exchanger X2 High temperature solution heat exchanger 1 Solution pump 2 Concentrated solution tube 3 Refrigerant pump 4 Refrigerant tube
5 Control valve
6 control valve 7 flow path 8 flow path 9 spray 10 medium concentration solution pipe 11 check valve 12 control valve 13 spray 14 dilute solution pipe 15 spray 16 hot water pipe 17 flow path 18 cold water pipe 19 working medium transport pipe 20 heat exchange pipe 21 Heat exchange pipe 22 Circulation pump 23 Spray 24 Refrigerant pump 25 Hot water pipe 26 Branch pipe 27 Orifice 28 Liquid level sensor 29 Inverter 30 Liquid level sensor 31 Liquid level sensor 32 Liquid level sensor 33 Pipe 34 Pump 35 Gas-liquid separator 36 Pipe 37 Steam discharge pipe 38 Water supply pump 39 Water supply pipe 40 Heat exchanger 41 Hot water pipe 42 Heat exchanger 43 Liquid level sensor 50 Can body 51 Nitrogen gas introduction part 52 Valve 53 Nitrogen gas supply source 55 Endoscope insertion part 55a Passage 56 Ball Valve 57 Lid 59 Endoscope 60 Fitting member 61 Support member 62 Ring member 65 Through hole 67 Guide member

Claims (4)

A plurality of can bodies, each forming an absorber, an evaporator, a regenerator, and a condenser;
A nitrogen gas introduction part communicating with the plurality of can bodies;
An endoscope insertion portion attached to any of the plurality of can bodies and having a passage communicating with the can body;
A fitting member having a through hole communicating with the passage of the endoscope insertion portion;
A valve provided in the passage of the endoscope insertion portion,
The heat pump according to claim 1, wherein the through hole has a diameter slightly larger than an outer diameter of the endoscope.   The heat pump according to claim 1, wherein the fitting member is detachably attached to the endoscope insertion portion.   The heat pump according to claim 1 or 2, wherein a guide member that guides the endoscope is provided inside the can body to which the endoscope insertion portion is attached. Supplying nitrogen gas to the can body of the heat pump to fill the can body with nitrogen gas,
Insert the endoscope into a through hole having a diameter slightly larger than the outer diameter of the endoscope,
Open a valve provided in a passage connecting the through hole and the can body,
Inserting the endoscope into the can body through the valve and the passage,
An internal inspection method for a heat pump, wherein the pressure of nitrogen gas filling the can body is maintained at a pressure higher than the pressure of the ambient atmosphere while the valve is open.

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