Heat pump cycle device

Abstract

To provide a heat pump cycle device that can reduce pressure loss. [Solution] The heat pump cycle device is a heat pump cycle device in which a plurality of compressors are arranged in parallel, wherein at least one of the pipe lengths is equal: the length of a plurality of supply pipes that supply refrigerant to each compressor from a branching point from a supply pipe on the suction side of the plurality of compressors, or the length of a plurality of outlet pipes that discharge refrigerant from each compressor to a confluence point on the discharge side of the plurality of compressors.

Description

Technical Field

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[0006]

[0001] The present invention relates to a heat pump cycle device capable of reducing pressure loss.

Background Art

[0002] As one of the steam generation devices, there is a steam generation heat pump device that recovers heat from waste warm water such as industrial wastewater and used cooling water to generate steam. The steam generation heat pump device functions as an evaporator of the heat pump cycle device as a waste heat recovery device, where heat is recovered from the heat source warm water to the refrigerant, and the recovered heat is used to heat the heated water in the condenser to generate steam. Therefore, there is an advantage that the running cost and the CO2 emission amount can be reduced compared to a combustion-based steam generation device that generates steam using boiler equipment or the like.

[0003] Patent Document 1 describes a steam generation device that circulates refrigerant in the order of a compressor, a radiator, a heat exchanger, an expansion section, and an evaporator.

Prior Art Document

Patent Document

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The number of compressors can be determined according to the required power specification of the system and connected in parallel, and there is no need to newly manufacture a dedicated product depending on the specification. When a plurality of compressors are connected in parallel and applied, there is a concern that the pressure loss increases due to uneven distribution in the branch section that distributes the refrigerant on the suction side of the plurality of compressors. Similarly, there is a concern that the pressure loss increases due to uneven confluence in the confluence section that combines the refrigerant on the discharge side of the plurality of compressors.

[0006] The present invention has been made in view of the above, and aims to provide a heat pump cycle device that can reduce pressure loss. [Means for solving the problem]

[0007] To solve the above-mentioned problems and achieve the objective, the heat pump cycle device according to the present invention is a heat pump cycle device in which a plurality of compressors are arranged in parallel, characterized in that at least one of the pipe lengths is equal: the pipe lengths of a plurality of supply pipes that supply refrigerant from a branching point from a supply pipe to each compressor on the suction side of the plurality of compressors, or the pipe lengths of a plurality of outlet pipes that discharge refrigerant from each compressor to a confluence point on the discharge side of the plurality of compressors.

[0008] Furthermore, the heat pump cycle device according to the present invention is characterized in that it includes an evaporator that recovers heat from a heat source hot water and evaporates a refrigerant, and the height of the outlet of the evaporator and the branching section are equal.

[0009] Furthermore, the heat pump cycle device according to the present invention comprises a subcooler that preheats supplied water by heat exchange with a refrigerant, and a condenser that heats the water from the subcooler to condense the refrigerant, wherein the subcooler is located below the condenser.

[0010] Furthermore, the heat pump cycle device according to the present invention is characterized in that the evaporator and the supercooler are arranged at the same height.

[0011] Furthermore, the heat pump cycle device according to the present invention is characterized in that it comprises two compressors, and the connection points of the supply pipes to each compressor are positioned at the same height and are arranged so that the distance from the branching point is equal in the horizontal direction.

[0012] Furthermore, the heat pump cycle device according to the present invention is characterized in that it comprises three or more compressors, and when viewed from a direction along the supply piping, the connection points of each supply pipe to each compressor are arranged to be the vertices of a regular polygon centered on the branching point. [Effects of the Invention]

[0013] According to the present invention, a heat pump cycle device that can reduce pressure loss can be realized. [Brief explanation of the drawing]

[0014] [Figure 1] Figure 1 is a block diagram showing the configuration of a steam generation heat pump device according to an embodiment of the present invention. [Figure 2] Figure 2 is a side view of the compression device. [Figure 3] Figure 3 is a front view of the compressor. [Figure 4] Figure 4 is a side view of the compression device. [Figure 5] Figure 5 is a front view of the compressor. [Figure 6] Figure 6 is a side view of the compression device. [Figure 7] Figure 7 is a front view of the compressor. [Modes for carrying out the invention]

[0015] Hereinafter, embodiments for carrying out this invention will be described with reference to the attached drawings.

[0016] <Overall Structure> Figure 1 is a block diagram showing the configuration of a steam generation heat pump device 1 according to an embodiment of the present invention. The steam generation heat pump device 1 is a device that recovers heat from waste hot water, uses the recovered heat to generate saturated steam, and outputs it to an external heat utilization facility (not shown). The waste hot water is a heat source medium supplied from a factory or the like.

[0017] As shown in FIG. 1, the steam generation heat pump device 1 includes a heat pump cycle device 10 that supplies heat as a heat source for steam generation, and a steam generation unit 20 that heats the heated water by the condenser 13 of the heat pump cycle device 10 to generate saturated steam.

[0018] The heat pump cycle device 10 includes a compression device 12 that compresses a refrigerant, a condenser 13 that condenses the refrigerant compressed by the compression device 12 through heat exchange with the heated water, a subcooler 14 that exchanges heat with the refrigerant from the condenser 13, an expansion valve 15 that is an expansion mechanism that decompresses the refrigerant condensed by the condenser 13, and an evaporator 11 that recovers the refrigerant expanded by the expansion valve 15 from the heat source medium and evaporates the refrigerant, and forms a heat pump cycle connected annularly.

[0019] The steam generation unit 20 preheats the water supplied from the water supply pump 22 by exchanging heat with the refrigerant in the subcooler 14, heats the heated water from the subcooler 14 with the refrigerant in the condenser 13, and allows the warm water to merge into the heated water and circulate through a steam separator 21 that separates the heated water into saturated steam and warm water, and outputs the saturated steam to the outside through the steam separator 21.

[0020] <Configuration of Compressor> The compression device 12 includes a plurality of compressors arranged in parallel. Each compressor is installed at the same position in the refrigerant flow path in the same direction. In the heat pump cycle device 10, a plurality of compressors are arranged in parallel according to the system capacity. Depending on the operating state of the system, some of the plurality of compressors may be stopped.

[0021] In the compression device 12, on the suction side of the plurality of compressors, the pipe lengths of the supply pipes 33 that supply refrigerant to each compressor from the branch portion 32 from the supply pipe 31 are equal. As a result, each compressor of the compression device 12 can inhale the refrigerant evenly and reduce the pressure loss. In particular, since the influence of the pressure loss is greater in the relatively low-pressure suction side piping, it is preferable that the pipe lengths of the supply pipes 33 are equal.

[0022] Furthermore, in the compressor 12, on the discharge side of the multiple compressors, the length of each pipe in the discharge pipe 34 that discharges refrigerant from each compressor to the confluence section 35 of the confluence pipe 36 is equal. As a result, each compressor in the compressor 12 discharges refrigerant evenly, reducing pressure loss.

[0023] <When there are two compressors> Figure 2 is a side view of the compressor 12A. Figure 3 is a front view of the compressor 12A, showing the compressor 12A as viewed from a direction along the junction pipe 36. Figure 2 is a view taken along arrow A2 in Figure 3, and Figure 3 is a view taken along arrow A1 in Figure 2.

[0024] The compressor 12A comprises two compressors 121A and 122A. The connections of the outlet pipes 34 (outlet pipes 341A and 342A) to each compressor 121A and 122A are positioned at the same height. Furthermore, the connections of the outlet pipes 34 (outlet pipes 341A and 342A) to each compressor 121A and 122A are positioned so that the distance from the confluence section 35 is equal in the horizontal direction. As a result, each compressor 121A and 122A of the compressor 12A can discharge refrigerant evenly, reducing pressure loss.

[0025] Figure 3 shows the arrangement on the discharge side of the compressor 12A. On the suction side of the compressor 12A, the connection points of the supply pipes 33 to each compressor 121A and 122A are positioned at the same height and arranged so that the distance from the branching section 32 is equal in the horizontal direction. As a result, each compressor 121A and 122A of the compressor 12A can draw in refrigerant evenly, and pressure loss can be reduced.

[0026] <When there are 3 compressors> Figure 4 is a side view of the compressor 12B. Figure 5 is a front view of the compressor 12B, showing the compressor 12B as viewed from a direction along the junction pipe 36. Figure 4 is a view taken along arrow B2 in Figure 5, and Figure 5 is a view taken along arrow B1 in Figure 4.

[0027] The compressor 12B comprises three compressors 121B, 122B, and 123B. When viewed from a direction along the junction piping 36, the connections of the outlet pipes 34 (outlet pipes 341B, 342B, and 343B) to each compressor 121B, 122B, and 123B are arranged to form the vertices of an equilateral triangle centered on the junction 35. As a result, each compressor 121B, 122B, and 123B of the compressor 12B can discharge refrigerant evenly, reducing pressure loss.

[0028] Figure 5 shows the arrangement on the discharge side of the compressor 12B. On the suction side of the compressor 12B, when viewed from the direction along the supply pipe 31, the connection points of the supply pipe 33 to each compressor 121B, 122B, and 123B are arranged to form the vertices of an equilateral triangle centered on the branching point 32. As a result, each compressor 121B, 122B, and 123B of the compressor 12B can draw in refrigerant evenly, reducing pressure loss.

[0029] <When there are 4 compressors> Figure 6 is a side view of the compressor 12C. Figure 7 is a front view of the compressor 12C, showing the compressor 12C as viewed from a direction along the junction pipe 36. Figure 6 is a view taken along arrow C2 in Figure 7, and Figure 7 is a view taken along arrow C1 in Figure 6.

[0030] The compressor 12C comprises four compressors 121C, 122C, 123C, and 124C. When viewed from a direction along the junction piping 36, the connections of the outlet pipes 34 (outlet pipes 341C, 342C, 343C, and 344C) to each compressor 121C, 122C, 123C, and 124C are arranged so that they form the vertices of a square (regular quadrilateral) centered on the junction 35. As a result, each compressor 121C, 122C, 123C, and 124C of the compressor 12C can discharge refrigerant evenly, reducing pressure loss.

[0031] Figure 7 shows the arrangement on the discharge side of the compressor 12C. On the suction side of the compressor 12C, when viewed from the direction along the supply piping 31, the connections of the supply pipes 33 to each of the compressors 121C, 122C, 123C, and 124C are arranged so that they form the vertices of a square centered on the branching section 32. As a result, each of the compressors 121C, 122C, 123C, and 124C of the compressor 12C can draw in refrigerant evenly, reducing pressure loss.

[0032] <If there are 5 or more compressors> If the compressor 12 has five or more compressors, as with the cases of three or four compressors, the connection points of the distribution pipes to each compressor should be arranged so that they form the vertices of a regular polygon centered on the confluence 35, when viewed from the direction along the confluence pipe 36. As a result, each compressor of the compressor 12 can discharge refrigerant evenly, and pressure loss can be reduced.

[0033] Similarly, when viewed from the direction along the supply piping 31, the connection points of the distribution pipes to each compressor should be arranged so that they form the vertices of a regular polygon centered on the branching point 32. As a result, each compressor of the compressor 12 can draw in refrigerant evenly, and pressure loss can be reduced.

[0034] <Positional relationship of each component> The evaporator 11 is positioned so that its outlet and the suction-side branch 32 of the compressor 12 (multiple compressors) are at the same height. The compressor 12 is connected to a suction-side supply pipe 31 and a discharge-side junction pipe 36, but since the suction-side piping is generally more affected by pressure loss, it is preferable that the outlet of the evaporator 11 and the suction-side branch 32 are at the same height. Furthermore, the outlet of the evaporator 11, the suction-side branch 32, and the discharge-side junction 35 may also be at the same height.

[0035] Furthermore, the supercooler 14 is located below the condenser 13. Since the water to be heated is preheated in the supercooler 14 and turned into steam in the condenser 13, it is preferable that the condenser 13 is located above the supercooler 14. Since the refrigerant condenses in the condenser 13 to become liquid and flows downward into the supercooler 14, it is preferable that the supercooler 14 is located below the condenser 13.

[0036] Furthermore, the evaporator 11 and the supercooler 14 are positioned at the same height. This is to reduce pressure loss in the path from the evaporator 11 to the supercooler 14.

[0037] By adopting the positional relationship described above, the pressure loss in the heat pump cycle device 10 can be reduced.

[0038] Furthermore, the configurations illustrated in the above embodiments are functionally schematic and do not necessarily have to be physically represented as shown. In other words, the forms of distribution and integration of each device and component are not limited to those shown, and all or part of them can be functionally or physically distributed and integrated in any unit according to various usage situations. [Explanation of symbols]

[0039] 1. Steam generating heat pump device 10 Heat pump cycle device 11 Evaporator 12, 12A, 12B, 12C Compressor 13 Condenser 14 Supercooler 15 Expansion valve 20 Steam generation section 21. Steam separator 22 Water supply pump 31 Supply piping 32 Branching point 33 Supply pipe 34, 341A, 342A, 341B, 342B, 343B, 341C, 342C, 343C, 344C Outflow pipe 35. Confluence 36 Junction Piping 121A, 121B, 121C, 122A, 122B, 122C, 123B, 123C, 124C Compressors

Claims

1. A heat pump cycle device in which multiple compressors are arranged in parallel, On the suction side of the aforementioned multiple compressors, the refrigerant is configured to flow to each compressor through multiple supply pipes that branch off from the supply pipe at a branching point. On the discharge side of the aforementioned plurality of compressors, the refrigerant is configured to flow from the respective outlet pipes of each compressor to a confluence section and then into a confluence pipe. The pipe lengths of the multiple supply pipes are equal, A heat pump cycle device characterized in that the heights of the branching section and the merging section are equal.

2. A heat pump cycle device comprising two compressors arranged in parallel, On the suction side of the two compressors, two supply pipes that supply refrigerant to each compressor from a branch point of the supply piping are arranged in the horizontal plane. On the discharge side of the two compressors, two outlet pipes for discharging refrigerant from each compressor to the junction pipe are arranged in the horizontal plane. The pipe lengths of the two supply pipes are equal, A heat pump cycle device characterized in that the heights of the branching section and the merging section are equal.

3. It is equipped with an evaporator that recovers heat from the hot water heat source and evaporates the refrigerant, The heat pump cycle apparatus according to claim 1 or 2, characterized in that the height of the outlet of the evaporator and the height of the branching section are equal.

4. A subcooler that preheats the supplied water by exchanging heat with a refrigerant, A condenser that heats the water from the subcooler to condense the refrigerant, Equipped with, The heat pump cycle apparatus according to claim 3, characterized in that the supercooler is located below the condenser.

5. The heat pump cycle apparatus according to claim 4, characterized in that the evaporator and the supercooler are arranged at the same height.

6. Equipped with two compressors, The connection points for each supply pipe to each compressor are: They are placed at the same height. The heat pump cycle device according to claim 1 or 2, characterized in that the components are arranged such that the distance from the branching portion is equal in the horizontal direction.

7. The heat pump cycle device according to claim 1, comprising three or more compressors, wherein, when viewed from a direction along the supply piping, the connection points of each supply pipe to each compressor are arranged to be the vertices of a regular polygon centered on the branching point.

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