阅读说明：本技术 板式热交换器、具备板式热交换器的热泵装置以及具备热泵装置的热泵式制冷制热供热水系统 (Plate heat exchanger, heat pump device provided with plate heat exchanger, and heat pump type cooling/heating/hot water supply system provided with heat pump device ) 是由 孙发明 吉村寿守务 永岛佳峰 白石匠 安部亮辅 横井政博 铃木一隆 于 2019-02-28 设计创作，主要内容包括：板式热交换器层叠有多个传热板,该传热板在四角具有开口部,各个传热板彼此的一部分被钎焊接合,供第一流体流动的第一流路和供第二流体流动的第二流路以各个传热板为界交替地形成,并且四角的开口部分别相连,形成有使第一流体流入流出的第一集管以及使第二流体流入流出的第二集管,其中,夹着第一流路或者第二流路的传热板之中的至少一方的传热板通过重叠两个金属板而构成,在两个金属板之中,位于第二流路侧的金属板比位于第一流路侧的金属板薄。(The plate heat exchanger is configured by stacking a plurality of heat transfer plates, each of the heat transfer plates having openings at four corners, a part of each of the heat transfer plates being joined by brazing, a first flow path through which a first fluid flows and a second flow path through which a second fluid flows being alternately formed between the heat transfer plates, and the openings at the four corners being connected to each other, and a first header through which the first fluid flows in and out and a second header through which the second fluid flows in and out being formed, wherein at least one of the heat transfer plates sandwiching the first flow path or the second flow path is configured by overlapping two metal plates, and the metal plate located on the second flow path side of the two metal plates is thinner than the metal plate located on the first flow path side.)

1. A plate heat exchanger is provided with a plurality of heat transfer plates stacked, the heat transfer plates having opening portions at four corners,

wherein a part of each of the heat transfer plates is joined by brazing, a first flow path through which a first fluid flows and a second flow path through which a second fluid flows are formed alternately with the heat transfer plates as a boundary, and the openings at four corners are connected to each other, and a first header through which the first fluid flows in and out and a second header through which the second fluid flows in and out are formed,

the heat transfer plate on at least one of the heat transfer plates sandwiching the first flow path or the second flow path is formed by overlapping two metal plates,

of the two metal plates, the metal plate located on the second flow path side is thinner than the metal plate located on the first flow path side.

2. A plate heat exchanger is provided with a plurality of heat transfer plates stacked, the heat transfer plates having opening portions at four corners,

wherein a part of each of the heat transfer plates is joined by brazing, a first flow path through which a first fluid flows and a second flow path through which a second fluid flows are formed alternately with the heat transfer plates as a boundary, and the openings at four corners are connected to each other, and a first header through which the first fluid flows in and out and a second header through which the second fluid flows in and out are formed,

the heat transfer plate on at least one of the heat transfer plates sandwiching the first flow path or the second flow path is formed by overlapping two metal plates,

the two above-mentioned metal plates are of the same thickness.

3. Plate heat exchanger according to claim 1 or 2,

one of the heat transfer plates sandwiching the first flow path or the second flow path is formed of a single metal plate.

4. A plate heat exchanger according to any of claims 1-3,

the first flow path and the second flow path are provided with inner fins.

5. The plate heat exchanger of any of claims 1 to 4,

between the two metal plates:

a microchannel formed in a heat exchange region where the first fluid and the second fluid exchange heat; and

and a peripheral leakage passage formed outside the microchannel and communicating with the outside.

6. The plate heat exchanger of any of claim 5,

an external flow path connected to the outside is provided outside the peripheral leakage path.

7. The plate heat exchanger of any of claims 1 to 6,

a leak point is formed by processing a part of the metal plate in a convex shape.

8. The plate heat exchanger of any of claims 1 to 7,

an outer wall portion is provided at the end portion,

the outer wall portions are not joined by brazing.

9. The plate heat exchanger of any of claims 1 to 8,

an anti-corrosion layer is provided on the metal plate sandwiching the second flow channel.

10. The plate heat exchanger of any of claims 1 to 9,

at least one of the two metal plates is provided with a partition passage by processing in a convex shape or a concave shape.

11. The plate heat exchanger of claim 10,

in the case where a plurality of the partition passages are formed,

the partition passages communicate with each other.

12. The plate heat exchanger of claim 10 or 11,

the partition passage is connected to the portion of the leak point.

13. The plate heat exchanger of any of claims 10 to 12,

an outer wall of the partition passage is brazed to the heat transfer plate to form a partition portion of the first flow path or the second flow path.

14. The plate heat exchanger of any of claims 10 to 13,

in the first flow path or the second flow path, the in-plane flow is a U-shaped flow.

15. A heat pump device, comprising:

a refrigerant circuit to which a compressor, a heat exchanger, a pressure reducing device, and the plate heat exchanger according to any one of claims 1 to 14 are connected and in which a refrigerant circulates; and

and a heat medium circuit through which a heat medium that exchanges heat with the refrigerant in the plate heat exchanger circulates.

16. A heat pump type cooling/heating/hot water supply system comprising the heat pump device according to claim 15, a cooling/heating/hot water supply device that performs cooling/heating and hot water supply using thermal energy of the heat medium, and a pump that is provided in the heat medium circuit and circulates the heat medium.

Technical Field

The present invention relates to a plate heat exchanger having a double-walled structure, a heat pump device having the plate heat exchanger, and a heat pump type cooling/heating/hot water supply system having the heat pump device.

Background

There has been conventionally known a plate heat exchanger in which a plurality of heat transfer plates are stacked, each of the heat transfer plates being formed of a double wall (double wall) in which two metal plates are stacked, the heat transfer plates having openings at four corners, the heat transfer plates being formed in an uneven or wavy shape, the heat transfer plates being joined by brazing to an outer wall portion of each heat transfer plate and a periphery of the opening, a first flow path through which a first fluid flows and a second flow path through which a second fluid flows being alternately formed, the openings at the other four corners being connected to each other, and a first (second) header through which the first (second) fluid flows into and out of the first (second) flow path is formed (see, for example, patent document 1).

In the plate heat exchanger of patent document 1, even when any heat transfer plate is accidentally cracked due to corrosion, freezing, or the like, the heat transfer plate has a double-walled structure, and therefore, it is possible to prevent the refrigerant from leaking into the room due to the penetration of both channels. Further, by detecting the leakage fluid flowing out to the outside by the detection sensor, the device provided with the plate heat exchanger is stopped, and damage and the like of the device can be prevented.

Prior art documents

Patent document

Patent document 1: japanese patent laid-open publication No. 2014-66411

Disclosure of Invention

Problems to be solved by the invention

In the laminated structure of patent document 1, when a crack occurs in any one of the two metal plates that are stacked, it is necessary to cause a leakage fluid to flow to the outside, and therefore the two metal plates are merely in close contact and are not joined to each other by metal. Therefore, there is a problem that an air layer exists between the two metal plates, which causes thermal resistance to be formed and heat transfer performance to be significantly lowered. Further, if the two metal plates are firmly adhered to each other in order to improve the heat transfer performance, the leakage fluid is hard to flow out to the outside, and the detection of the leakage fluid to the outside becomes difficult.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a plate heat exchanger, a heat pump apparatus including the plate heat exchanger, and a heat pump type cooling/heating hot water supply system including the heat pump apparatus, which are capable of preventing mixing of two fluids and outflow of the fluids to the outside and detecting leaked fluids to the outside even in a case where a crack is unexpectedly generated in a heat transfer plate due to corrosion, freezing, or the like while suppressing a decrease in heat transfer performance, which is a drawback of a double-wall structure.

Means for solving the problems

A plate heat exchanger according to the present invention is a plate heat exchanger in which a plurality of heat transfer plates having opening portions at four corners are stacked, a first flow path through which a first fluid flows and a second flow path through which a second fluid flows are formed alternately between the heat transfer plates, and the opening portions at the four corners are connected to each other, and a first header through which the first fluid flows in and out and a second header through which the second fluid flows in and out are formed, wherein at least one of the heat transfer plates sandwiching the first flow path or the second flow path is formed by stacking two metal plates, and the metal plate positioned on the second flow path side is thinner than the metal plate positioned on the first flow path side, of the two metal plates.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the plate heat exchanger of the present invention, the metal plate located on the second flow path side is thinner than the metal plate located on the first flow path side. As described above, by making the thickness of the heat transfer plate located on the second flow path side thinner, the heat exchange efficiency between the first fluid and the second fluid becomes better, so that the heat exchange performance of the plate heat exchanger can be improved, and the manufacturing cost can be suppressed. Even in the case of corrosion, freezing, or the like, leakage occurs from the side of the metal plate located on the second flow path side, which is thinner than the metal plate located on the first flow path side. Therefore, by detecting the leakage of the second fluid by the detection sensor provided outside, the fluid can be prevented from being mixed and flowing out to the outside, and the leaked fluid can be detected outside.

Drawings

Fig. 1 is an exploded side perspective view of a plate heat exchanger according to embodiment 1 of the present invention.

Fig. 2 is a front perspective view of a heat transfer assembly of a plate heat exchanger according to embodiment 1 of the present invention.

Fig. 3 is a partial schematic view showing a space between two metal plates constituting a heat transfer plate of the plate heat exchanger according to embodiment 1 of the present invention.

Fig. 4 is a partial schematic view showing a modification 1 between two metal plates constituting a heat transfer plate of a plate heat exchanger according to embodiment 1 of the present invention.

Fig. 5 is a partial schematic view showing a 2 nd modification example between two metal plates that constitute a heat transfer plate of the plate heat exchanger according to embodiment 1 of the present invention.

Fig. 6 is a sectional view a-a in fig. 2 of the heat transfer assembly of the plate heat exchanger according to embodiment 1 of the present invention.

Fig. 7 is a sectional view of the heat transfer assembly of the plate heat exchanger according to embodiment 2 of the present invention.

Fig. 8 is a cross-sectional view of a heat transfer assembly according to a modification of the plate heat exchanger according to embodiment 2 of the present invention.

Fig. 9 is a front perspective view of a heat transfer assembly of a plate heat exchanger according to embodiment 3 of the present invention.

Fig. 10 is a sectional view taken along line a-a in fig. 9 of the heat transfer assembly of the plate heat exchanger according to embodiment 3 of the present invention.

Fig. 11 is a front perspective view of a heat transfer assembly of a plate heat exchanger according to embodiment 4 of the present invention.

Fig. 12 is a sectional view taken along line a-a in fig. 11 of the heat transfer assembly of the plate heat exchanger according to embodiment 4 of the present invention.

Fig. 13 is a sectional view of a heat transfer assembly of a plate heat exchanger according to embodiment 5 of the present invention.

Fig. 14 is a sectional view of a heat transfer assembly of a plate heat exchanger according to embodiment 6 of the present invention.

Fig. 15 is a front perspective view of a heat transfer assembly of a plate heat exchanger according to embodiment 7 of the present invention.

Fig. 16 is a sectional view taken along line a-a in fig. 15 of the heat transfer assembly of the plate heat exchanger according to embodiment 7 of the present invention.

Fig. 17 is a sectional view taken along line B-B in fig. 15 of the heat transfer assembly of the plate heat exchanger according to embodiment 7 of the present invention.

Fig. 18 is an exploded side perspective view of a plate heat exchanger according to embodiment 8 of the present invention.

Fig. 19 is a front perspective view of a heat transfer assembly of a plate heat exchanger according to embodiment 8 of the present invention.

Fig. 20 is a front perspective view of a heat transfer plate of a plate heat exchanger according to embodiment 8 of the present invention.

Fig. 21 is a sectional view taken along line a-a in fig. 19 of the heat transfer assembly of the plate heat exchanger according to embodiment 8 of the present invention.

Fig. 22 is a sectional view taken along line B-B in fig. 19 of the heat transfer assembly of the plate heat exchanger according to embodiment 8 of the present invention.

Fig. 23 is a cross-sectional view taken along line C-C in fig. 19 of the heat transfer assembly of the plate heat exchanger according to embodiment 8 of the present invention.

Fig. 24 is an exploded side perspective view of a plate heat exchanger according to embodiment 9 of the present invention.

Fig. 25 is a front perspective view of a heat transfer assembly of a plate heat exchanger according to embodiment 9 of the present invention.

Fig. 26 is a front perspective view of a heat transfer plate of a plate heat exchanger according to embodiment 9 of the present invention.

Fig. 27 is a sectional view taken along line a-a in fig. 25 of the heat transfer assembly of the plate heat exchanger according to embodiment 9 of the present invention.

Fig. 28 is a sectional view taken along line B-B in fig. 25 of the heat transfer assembly of the plate heat exchanger according to embodiment 9 of the present invention.

Fig. 29 is a schematic diagram showing the configuration of a heat pump type air-conditioning/heating/hot-water supply system according to embodiment 10 of the present invention.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below. In the following drawings, the relationship between the sizes of the respective components may be different from the actual one.

In the following description, directional terms (for example, "upper", "lower", "right", "left", "front", "rear", and the like) are used as appropriate for easy understanding, but these terms are merely used for explanation, and do not limit the present invention. In the embodiment described below, the "upper", "lower", "right", "left", "front", and "rear" are used when the plate heat exchanger 100 is viewed from the front, that is, when the plate heat exchanger 100 is viewed in the stacking direction of the heat transfer plates 1 and 2. The term "concave" and "convex" means that a portion protruding forward is referred to as "convex" and a portion protruding rearward is referred to as "concave".