Absorption type hot and cold water machine

Abstract

To provide an absorption chiller heater capable of suppressing filter clogging to sustain circulation of a solution.SOLUTION: An absorption chiller heater 1 comprises: an absorber 3 which generates a diluted solution RS; diluted solution piping 12 disposed between the absorber 3 and a high-temperature regenerator 6; a solution circulation pump 9 disposed in the middle of the diluted solution piping 12, which feeds the diluted solution RS into the high-temperature regenerator 6; a filter member 30 disposed at a lower part in a container 10, which filters the diluted solution RS; and a filter cleaning pipe 20 branched from the diluted solution piping 12, which discharges the diluted solution RS to the filter member 30. The filter member 30 has a filtering part 31 disposed to be inclined in a direction intersecting a vertical direction of the container 10, which filters foreign matter F mixed in the diluted solution RS, and socket part 32 disposed at a lower side end part in the vertical direction of the filtering part 31, which accumulates the foreign matter F remaining on the filtering part 31. The filter cleaning pipe 20 has a discharge port 22 which discharges the diluted solution RS toward the socket part 32 along the filtering part 31.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an absorption type chiller-heater. [Background technology]

[0002] An absorption type chiller / heater generates cold water required for cooling operation and hot water required for heating operation by four processes, for example, evaporation, absorption, regeneration, and condensation. The cold water and hot water generated by the absorption type chiller / heater are sent to an external heat exchanger during cooling operation or heating operation for use. In such an absorption type chiller / heater, for example, a dilute solution dripped onto a heat transfer tube in a condenser is circulated to each heat exchanger and regenerator by a solution circulation pump. The dilute solution is circulated from the absorber through a low-temperature heat exchanger and a high-temperature heat exchanger to a high-temperature regenerator and then returned to the absorber as a concentrated solution, so there is a risk of foreign matter (for example, cutting chips and metal oxide film) being mixed in. A filter is provided in front of the solution circulation pump to filter out foreign matter mixed in the dilute solution in order to protect the pump. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 9-42793 Summary of the Invention [Problem to be solved by the invention]

[0004] However, if foreign matter remains on the filter, the filter will gradually become clogged, reducing the amount of solution supplied to the solution circulation pump and making it difficult to maintain circulation of the solution. As a result, the foreign matter must be removed, which leaves room for improvement in terms of maintenance.

[0005] An object of the present invention is to provide an absorption type chiller-heater that can suppress filter clogging and sustain the circulation of solution. [Means for solving the problem]

[0006] In order to achieve the above object, an absorption type chiller / heater according to the present invention comprises an absorber, which is provided in a container communicating with an evaporator and which generates a dilute solution by absorbing refrigerant vapor generated by the evaporator into a concentrated solution, a solution pipe connected to a lower part of the container and disposed between the absorber and a high-temperature generator, a solution circulating pump provided midway through the solution pipe and feeding the dilute solution to the high-temperature generator, a filter member disposed in the lower part of the container and filtering the dilute solution, and a filter cleaning pipe branching off from the solution pipe downstream of the solution circulating pump and discharging the dilute solution to the filter member, the filter member being disposed at an angle in a direction intersecting the vertical direction of the container and filtering foreign matter mixed in the dilute solution. Conical a filter section; and a socket section provided at a lower end of the filter section in the vertical direction for collecting foreign matter remaining in the filter section. The filter cleaning pipe is a discharge portion provided at an end portion of the filter cleaning pipe on the absorber side; a recess provided at a vertically lower end portion of the discharge portion, the recess being adapted to receive an upper apex portion of the filtering portion in the vertical direction when the discharge portion is attached to the filter member; A discharge port that discharges the dilute solution toward the socket portion along the filtration portion. and The present invention is characterized in that it has the following features: Effect of the Invention

[0007] Advantageous Effects of Invention According to the absorption type chiller-heater of the present invention, there is an effect that filter clogging can be suppressed and circulation of the solution can be sustained. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram showing a schematic configuration of an absorption chiller-heater according to an embodiment. [Diagram 2] FIG. 2 is a schematic diagram showing a schematic configuration of a filter structure of the absorption type chiller-heater according to the embodiment. [Diagram 3] FIG. 3(A) is a schematic diagram of the filter structure as viewed from the horizontal direction, and FIG. 3(B) is a schematic diagram of the filter structure as viewed from above in the vertical direction. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of an absorption chiller-heater according to the present invention will be described in detail with reference to the drawings. The present invention is not limited to the contents described in the following embodiment. In other words, the components described below include those that a person skilled in the art can easily imagine, or those that are substantially the same. Furthermore, various omissions, substitutions, or modifications of the configuration can be made without departing from the gist of the present invention.

[0010] [Embodiment] The absorption type chiller-heater according to the present embodiment will be described with reference to Fig. 1 to Fig. 3. Fig. 1 is a schematic diagram showing the schematic configuration of the entire absorption type chiller-heater, and Fig. 2 is a schematic diagram showing the schematic configuration of the filter structure of an absorber / evaporator in the absorption type chiller-heater.

[0011] The absorption type chiller / heater 1 performs air conditioning for heating and cooling in, for example, a building or facility, and generates cold water required for cooling operation and hot water required for heating operation through four processes: evaporation, absorption, regeneration, and condensation. The generated cold water is circulated between the absorption type chiller / heater 1 and an indoor unit (not shown) and used for cooling, and the generated hot water is used for heating. As shown in FIG. 1, the absorption type chiller / heater 1 of this embodiment includes an evaporator 2, an absorber 3, a condenser 4, a low-temperature regenerator 5, a high-temperature regenerator 6, a low-temperature heat exchanger 7, a high-temperature heat exchanger 8, a solution circulating pump 9, a filter cleaning pipe 20, and a filter member 30.

[0012] The evaporator 2 evaporates the refrigerant (for example, water) condensed in the condenser 4. Inside the evaporator 2, there are provided a refrigerant distributor (not shown) that drips (sprays) the refrigerant supplied from the condenser 4 through the cooling water pipe 17, and a heat transfer tube 11A (evaporation heat exchanger) that is connected to the indoor unit through a cold water pipe (not shown) and through which cold water circulates between the evaporator 2 and the indoor unit through the cold water pipe. Inside the evaporator 2, there is a vacuum state, and the evaporation temperature of the refrigerant is about 5°C or the like. The refrigerant dripped onto the heat transfer tube 11A evaporates due to the temperature of the heat transfer tube 11A, while the water flowing inside the heat transfer tube 11A loses its temperature due to the evaporation of the refrigerant. The water flowing inside the heat transfer tube 11A is supplied to the indoor unit as cold water.

[0013] The absorber 3 absorbs the refrigerant evaporated in the evaporator 2. A strong solution (a solution with a high concentration of absorbing solution) is supplied to the absorber 3 from the high-temperature regenerator 6 through the low-temperature regenerator 5. Here, the absorbing solution is, for example, lithium bromide (LiBr). In the absorber 3, the evaporated refrigerant (refrigerant vapor) is absorbed by the strong solution to generate a dilute solution. In the absorber 3, a strong solution distributor (not shown) that drips (sprays) the strong solution supplied from the low-temperature regenerator 5 through the strong solution pipe 14, and a heat transfer tube 11B (absorption heat exchanger) to which cooling water cooled in a cooling tower (not shown) is supplied are provided. The strong solution dripped onto the heat transfer tube 11B by the strong solution distributor flows down the outer surface of the heat transfer tube 11B and absorbs the refrigerant vapor. The absorption heat generated by the absorption of the refrigerant vapor by the strong solution is removed by the cooling water flowing in the heat transfer tube 11B. The dilute solution RS (a solution with a low concentration of absorbent) whose concentration has been reduced by absorbing the refrigerant vapor is supplied to the high-temperature regenerator 6 side through the dilute solution pipe 12.

[0014] The condenser 4 liquefies (condenses) the refrigerant vapor supplied from the high-temperature regenerator 6 through the refrigerant vapor pipe 15 via the low-temperature regenerator 5. A condensing heat exchanger (not shown) is provided inside the condenser 4, and cooling water cooled in a cooling tower is supplied to the condensing heat exchanger. The refrigerant vapor supplied from the high-temperature regenerator 6 is condensed by the cooling water flowing inside the condensing heat exchanger. The condensed refrigerant flows down the outer surface of the condensing heat exchanger, is collected, and is supplied to the evaporator 2.

[0015] The low-temperature regenerator 5 is a device for concentrating the intermediate concentrated solution, which is supplied from the high-temperature regenerator 6 through the intermediate concentrated solution pipe 13 and the high-temperature heat exchanger 8, by heating with the refrigerant vapor from the high-temperature regenerator 6 to produce a concentrated solution. The concentrated solution is heated in the low-temperature heat exchanger 7 via the concentrated solution pipe 14 and supplied to the absorber 3.

[0016] The high-temperature regenerator 6 heats the dilute solution RS, which is a mixture of the refrigerant and the absorbing liquid, and generates refrigerant vapor and an intermediate concentrated solution by releasing steam from the dilute solution RS through the heating. The high-temperature regenerator 6 heats and concentrates the dilute solution RS, which is supplied from the absorber 3 through the dilute solution pipe 12 via the low-temperature heat exchanger 7 and the high-temperature heat exchanger 8, to produce an intermediate concentration solution. The intermediate concentration solution passes through the intermediate concentrated solution pipe 13, is heated in the high-temperature heat exchanger 8, and is supplied to the low-temperature regenerator 5.

[0017] The low-temperature heat exchanger 7 exchanges heat between the dilute solution RS flowing in the dilute solution pipe 12 and the concentrated solution flowing in the concentrated solution pipe 14 .

[0018] The high-temperature heat exchanger 8 exchanges heat between the dilute solution RS flowing in the dilute solution pipe 12 and the intermediate concentrated solution flowing in the intermediate concentrated solution pipe 13 .

[0019] The solution circulating pump 9 is provided in the middle of the dilute solution piping 12, and sends the dilute solution RS to the high-temperature generator 6. The solution circulating pump 9 is provided to send the dilute solution that has absorbed the refrigerant vapor in the absorber 3 through the dilute solution piping 12 and via the low-temperature heat exchanger 7 and high-temperature heat exchanger 8 to the high-temperature generator 6, where it is circulated again. A filter member 30 is provided upstream of the solution circulating pump 9.

[0020] The filter cleaning pipe 20 branches off from the dilute solution pipe 12 downstream of the solution circulation pump 9 and discharges the dilute solution RS to the filter member 30. The filter cleaning pipe 20 is piped from the branch point with the dilute solution pipe 12 to the absorber 3, and has a discharge part 21 that discharges the dilute solution RS at the end on the absorber 3 side. The filter cleaning pipe 20 is a supply path that supplies a part of the dilute solution RS sent to the high-temperature regenerator 6 side through the dilute solution pipe 12 by the drive of the solution circulation pump 9 to the discharge part 21. The filter cleaning pipe 20 can wash away foreign matter F remaining on the filter member 30 by discharging a part of the dilute solution RS sent to the high-temperature regenerator 6 side through the dilute solution pipe 12 by the drive of the solution circulation pump 9 from the discharge part 21 to the filter member 30. The branch point of the filter cleaning pipe 20 in the dilute solution pipe 12 is preferably located near the solution circulation pump 9.

[0021] The discharge part 21 is disposed in the container 10 in an assembled state in which it is assembled to the filter member 30. The discharge part 21 is formed in a cylindrical shape, and has a circular discharge port (spray hole) 22 that discharges the dilute solution RS to the filter member 30 in the assembled state. The discharge ports 22 are formed in the discharge surface 21a, and are arranged at regular intervals along the outer periphery of the discharge part 21 when the discharge part 21 is viewed from below in the vertical direction. In this embodiment, eight discharge ports 22 are provided in the discharge part 21. The discharge surface 21a is formed so as to intersect or cross the filtration part 31 of the filter member 30 in the assembled state. The discharge part 21 has a flow path through which the dilute solution RS flows inside, and the flow path branches into multiple flow paths on the way from the filter cleaning pipe 20 side to the multiple discharge ports 22.

[0022] 2, the filter member 30 is disposed in the lower part of the container 10 and filters the dilute solution RS. The filter member 30 filters out foreign matter F (e.g., cutting chips and metal oxide film) mixed in the dilute solution RS when the dilute solution RS circulates in the absorption chiller-heater 1. The filter member 30 has a filtering portion 31 and a socket portion 32.

[0023] The filtration section 31 is a so-called wire mesh, and is disposed in the filter member 30 at an incline in a direction intersecting the vertical direction of the container 10, and is a part that filters foreign matter F mixed in the dilute solution RS. The filtration section 31 in this embodiment is formed in a cone shape that opens downward in the vertical direction, and filters foreign matter F mixed in the dilute solution RS when the dilute solution RS passes from the front side to the back side of the inclined surface. The filtration section 31 is required to remove foreign matter F of a size that may affect (for example, cause a breakdown) the solution circulation pump 9, for example, among the foreign matter F that may be mixed in the dilute solution RS, and therefore preferably has a mesh size (so-called mesh size) according to the size. For this reason, the filtration section 31 is composed of, for example, a mesh 40 with a wire diameter of 0.18 mm. The mesh part of the filtration section 31 may be, for example, a plain weave, a twill weave, or a tatami weave, but it is preferable that it is according to the size of the foreign matter F to be removed. The filtration section 31 is formed of a metal material such as SUS304. Moreover, since it is necessary that the foreign matter F does not remain in the mesh portion and that the foreign matter F is quickly pushed toward the socket portion 32 by the dilute solution RS discharged from the discharge port 22, it is preferable that the inclination angle of the inclined portion of the filtration portion 31 has a certain inclination angle, and the inclination angle is set to 40° or more, for example. The filtration portion 31 is formed so that its apex portion on the vertical upper side fits into the recess 23 provided at the end portion on the vertical lower side of the discharge portion 21 in the assembled state.

[0024] The socket portion 32 is provided at the vertical lower end of the filtering portion 31 in the filter member 30, and is a portion that collects foreign matter remaining on the filtering portion 31. The socket portion 32 is provided at a point where foreign matter F remaining in the filtering portion 31 is pushed out by the dilute solution RS discharged from the discharge port 22 toward the socket portion 32 along the filtering portion 31. The socket portion 32 has an outer peripheral wall 40, a space portion 41, a discharge pipe 42, and a vacuum pump 51.

[0025] The outer peripheral wall 40 is a part that stands from the outer peripheral end of the filtration section 31 toward the vertically upward direction so as to surround the filtration section 31 when the filtration section 31 is viewed in the vertical direction. When viewed in the vertical direction, the outer peripheral wall 40 is formed in an annular shape to match the conical filtration section 31. The outer peripheral wall 40 is formed integrally with the outer peripheral wall of the container 10 at a lower part inside the container 10 so that the diluted solution RS discharged from the discharge port 22 does not leak out of the container 10. The outer peripheral wall of the container 10 is formed so as to surround the heat transfer tubes 11A, 11B, etc., but the inner diameter is gradually narrowed toward the outer peripheral wall 40 midway in the vertical direction.

[0026] The space 41 is formed between the filtration section 31 and the outer peripheral wall 40, and is a portion where foreign matter F can accumulate. The space 41 is a part of the internal space of the container 10. The space 41 is formed in a circular ring shape when the filtration section 31 is viewed vertically. The vertical lower side of the space 41 has a connecting portion 43 that connects the filtration section 31 and the outer peripheral wall 40. The connecting portion 43 is a part that forms the space 41, and unlike the filtration section 31, it is not formed in a mesh shape. The connecting portion 43 prevents the foreign matter F from falling vertically below the filtration section 31.

[0027] The discharge pipe 42 penetrates the outer peripheral wall 40 and communicates with the space 41. Since the space 41 is a part of the internal space of the container 10, the discharge pipe 42 communicates the internal space of the container 10 with the outside. The discharge pipe 42 is a discharge path that discharges foreign matter F that accumulates in the space 41 by driving the vacuum pump 51 together with the dilute solution RS to the outside of the apparatus. A vacuum valve 50 is provided in the discharge pipe 42 between the container 10 and the vacuum pump 51.

[0028] The vacuum pump 51 is connected to the discharge pipe 42 and discharges foreign matter accumulated in the space 41 to the outside of the container 10. The vacuum pump 51 is provided at the end of the discharge pipe 42 in the extending direction, and is driven with the vacuum valve 50 open to discharge the foreign matter F accumulated in the space 41 together with the dilute solution RS to the outside of the apparatus by so-called vacuum drawing. The vacuum pump 51 is disposed outside the apparatus, but may be disposed inside the apparatus.

[0029] Next, the function of the filter structure of the absorption chiller-heater 1 will be described with reference to Fig. 3(A) and Fig. 3(B). In the filter member 30, when the dilute solution RS whose concentration has been reduced by the absorption of refrigerant vapor passes through the filtration section 31, the filtration section 31 removes foreign matter F that has been mixed into the dilute solution RS.

[0030] When the solution circulation pump 9 is driven, the dilute solution RS remaining in the lower part of the container 10 and in a part of the dilute solution pipe 12 is sent to the high-temperature regenerator 6. At this time, a part of the dilute solution RS flowing through the dilute solution pipe 12 by the drive of the solution circulation pump 9 is discharged from the outlet 22 of the discharge part 21 through the filter washing pipe 20 via a branch. The diameter and flow rate of the filter washing pipe 20 are required to ensure that the foreign matter F does not remain in the filtration part 31, that the foreign matter F on the filtration part 31 is quickly pushed toward the socket part 32 by the dilute solution RS discharged from the outlet 22, and that the foreign matter F accumulated in the socket part 32 does not return to the filtration part 31 again by the dilute solution RS sprayed from the outlet 22. For this reason, it is preferable that the diameter and flow rate of the filter washing pipe 20 have a constant diameter and flow rate, and for example, the diameter is set to φ34 and the flow rate is set to 3350 [l / m]. The hole diameter of the discharge port 22 and the discharge speed (jetting speed) of the dilute solution RS discharged from the discharge port 22 must be such that the foreign matter F does not remain in the filtration section 31, the dilute solution RS discharged from the discharge port 22 quickly pushes the foreign matter F on the filtration section 31 toward the socket section 32, and the foreign matter F accumulated in the socket section 32 does not return to the filtration section 31 again due to the dilute solution RS sprayed from the discharge port 22. For this reason, the hole diameter and the jetting speed of the discharge port 22 are preferably constant, and for example, the hole diameter is set to φ4.8 and the jetting speed is set to 8.6 [m / s].

[0031] The dilute solution RS discharged from the discharge port 22 pushes the foreign matter F remaining in the filtration section 31 along the filtration section 31 into the socket section 32. A part of the dilute solution RS that has reached the socket section 32 remains in the space section 41, while the rest passes through the filtration section 31 and flows into the dilute solution pipe 12. In addition, the foreign matter F that has reached the socket section 32 is deposited on the outer peripheral wall 40 side in the space section 41 by the force of the dilute solution RS that is continuously discharged from the discharge port 22.

[0032] Since the foreign matter F gradually accumulates in the socket portion 32, it is necessary to discharge the accumulated foreign matter F to the outside of the device. For example, an operator performing maintenance on the absorption chiller-heater 1 stops the operation of the solution circulating pump 9 and starts the operation of the vacuum pump 51. When the vacuum valve 50 is switched from a closed state to an open state while the vacuum pump 51 is being driven, the foreign matter F accumulated in the space portion 41 of the socket portion 32 is discharged to the outside of the device through the discharge pipe 42 together with the dilute solution RS remaining in the space portion 41 by the negative pressure. This makes it possible to remove the foreign matter F accumulated in the socket portion 32 without the operator having to perform the removal work of removing the foreign matter F from the socket portion 32 himself.

[0033] As described above, the absorption chiller-heater 1 of this embodiment has a filter member 30 arranged at an angle in a direction intersecting the vertical direction of the container 10, a filtration section 31 that filters out foreign matter F mixed in the dilute solution RS, and a socket section 32 that is provided at the lower end of the filtration section 31 in the vertical direction and collects the foreign matter F remaining on the filtration section 31. The filter cleaning pipe 20 has a discharge port 22 that discharges the dilute solution RS along the filtration section 31 toward the socket section 32.

[0034] With the above configuration, part of the dilute solution RS sent to the high-temperature regenerator 6 side through the dilute solution pipe 12 is discharged from the discharge part 21 to the filtration part 31 by driving the solution circulation pump 9, thereby washing away the foreign matter F remaining in the filtration part 31 and always ensuring a certain amount of the area of ​​the filtration part 31 that is free of foreign matter, thereby preventing the accumulation of foreign matter throughout the entire filtration part. As a result, the circulation of the dilute solution can be sustained while preventing filter clogging.

[0035] Furthermore, in the absorption chiller-heater 1 of this embodiment, the vacuum pump 51 is driven to discharge the foreign matter F accumulated in the space 41 of the socket 32 ​​through the discharge pipe 42 to the outside of the outer peripheral wall 40. Conventionally, a maintenance worker was required to periodically remove the foreign matter F accumulated in the space 41 in the socket 32. However, since the accumulated foreign matter F is automatically discharged, it is possible to remove the foreign matter F before it fills up the space 41, thereby reducing the frequency of the worker's work of removing the foreign matter F. As a result, the maintainability of the absorption chiller-heater 1 can be improved.

[0036] In the above embodiment, the connecting portion 43 is not formed in a mesh shape, unlike the filtering portion 31, but is not limited thereto. For example, the connecting portion 43 may be formed in a mesh shape similar to the filtering portion 31.

[0037] In the above embodiment, the dilute solution RS is heated by a plurality of regenerators, namely the high-temperature regenerator 6 and the low-temperature regenerator 5, but the present invention is not limited to this and may be configured with a single regenerator. Furthermore, in the above embodiment, other components such as a heat exchanger may be provided in various places. [Explanation of symbols]

[0038] 1 Absorption type chiller / heater 2. Evaporator 3. Absorber 4 Condenser 5 Low temperature regenerator 6 High temperature regenerator 9. Solution Circulation Pump 10 containers 20 Filter cleaning pipe 21 Discharge part 22 Discharge port 30 Filter material 31 Filtration section 32 Socket section 40 Peripheral wall 41 Space section 42 Discharge pipe 51 Vacuum Pump RS Dilute Solution F Foreign matter

Claims

1. an absorber provided in a container communicating with the evaporator, the absorber absorbing the refrigerant vapor generated by the evaporator into a concentrated solution to generate a diluted solution; a solution pipe connected to a lower portion of the container and disposed between the absorber and a high-temperature generator; a solution circulating pump provided in the solution piping for feeding the dilute solution to the high-temperature generator; a filter member disposed in a lower portion of the container and configured to filter the diluted solution; a filter cleaning pipe that branches off from the solution piping downstream of the solution circulating pump and discharges the dilute solution onto the filter member, The filter member is a conical filtration section disposed at an angle in a direction intersecting with the vertical direction of the container, for filtering out foreign matter mixed in the dilute solution; a socket portion provided at a lower end portion of the filtering portion in the vertical direction and configured to collect foreign matter remaining in the filtering portion; The filter cleaning pipe is a discharge portion provided at an end portion of the filter cleaning pipe on the absorber side; a recess provided at a vertically lower end of the discharge portion, into which an upper vertex portion of the filtering portion in the vertical direction is fitted when the discharge portion is assembled to the filter member; and a discharge port that discharges the dilute solution toward the socket portion along the filtration portion in the assembled state. The absorption type hot and cold water machine is characterized by the above.

2. The socket portion is When the filtration section is viewed in a vertical direction, an outer peripheral wall is erected from an outer peripheral end portion of the filtration section toward the vertical upper side so as to surround the filtration section; A space portion formed between the filtration portion and the outer peripheral wall, in which the foreign matter can accumulate; A discharge pipe that penetrates the outer peripheral wall and communicates with the space; a vacuum pump connected to the exhaust pipe and configured to exhaust the foreign matter accumulated in the space to the outside of the container. The absorption type chiller / heater according to claim 1.

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