JP2001355977A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger adapted to heat exchange between a primary side where a refrigerant passes and a secondary side where water of a fluid to be heated passes, wherein pressure resistance is that ensures the use of a high pressure gas refrigerant is secured, and the manufacturing cost is sharply reduced with excellent heat efficiency. SOLUTION: A heat exchanger comprises a primary side where one header 12 is provided having an inlet 11 opened for a refrigerant and the other header 14 is provided having an outlet 13 opened for a refrigerant, to which headers both opening ends of tube groups 17 in each of which many capillary tubes 16 are arranged in parallel to each other, the tube group 17 being held with two bulged plates 20 and joined with each other along their peripheral edges, and further comprises a secondary side where a communication passage 24 is formed which reaches from the inlet 21 one end of which is opened to the outlet 22 the other end of which is opened, the tube group 17 penetrating the communication passage 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger configured to exchange heat between a primary side through which a refrigerant flows and a secondary side through which water as a fluid to be heated flows.

[0002]

A heat exchanger used in a heat pump type water heater using a refrigerant has a primary side when a high-pressure gas refrigerant flows and a secondary side through which water of a fluid to be heated flows. There is a need for a structure that is configured to exchange heat and that sufficiently withstands high-pressure refrigerant. Conventionally, in order to ensure this pressure resistance, a plate structure using an expensive material such as aluminum or stainless steel having pressure resistance has been adopted, and the structure is complicated, processing is difficult, and the production cost is high. Also,
It was also difficult to obtain an effective area for heat exchange between the primary side and the secondary side, and there was also a problem in terms of thermal efficiency.

An object of the present invention is to solve these problems, to provide a heat exchanger having a novel structure, to ensure the pressure resistance to enable the use of a high-pressure gas refrigerant, and to use an electric furnace. The present invention proposes a heat exchanger which can be manufactured by brazing to greatly reduce the manufacturing cost and has excellent thermal efficiency.

[0004]

To achieve the above object, a heat exchanger according to the present invention comprises a primary side through which a refrigerant flows,
In a heat exchanger configured to exchange heat with the secondary side through which water of the fluid to be heated flows, a number of capillary tubes are provided in one header having an opening for the refrigerant and the other header having an opening for the refrigerant. Are joined together to form a primary side. Then, the tube group is sandwiched between the two swelled plates, the peripheral edges are joined, and a flow path from an inlet opened at one end to an outlet opened at the other end is formed to form a secondary side, and the tube is formed. A group is formed through the flow passage.

[0005] This heat exchanger can be manufactured by forming all members or members to be joined by using a copper material, and brazing the assembled product at a time in an electric furnace.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. In the embodiment of the present invention shown in the drawings, the primary side through which a high-pressure gas refrigerant flows is provided with a refrigerant inlet at one open end of a tube group 17 in which a number of capillary tubes (copper thin tubes of several mm in diameter) 16 are arranged in parallel. A tubular header 12 having an opening 11 is joined thereto, and a tubular header 14 having an opening 13 for the refrigerant is joined to the other open end. Header 12,
A long hole 15 is opened in the side wall of the tube 14, and the open end of the tube group 17 is inserted into and joined to the long hole 15.
6 to flow into the header 14, flow out of the outlet 13, and circulate through the refrigerant circuit.

[0007] The secondary side through which the water to be heated flows is
The two long-sided plates (copper plates) 20 are bulged in a substantially symmetrical shape, the tube group 17 is sandwiched between the two plates 20 and their peripheral edges are joined, and the inlet 2 is opened at one end.
An outlet 22 having an opening at the other end is formed at the other end, a flow path 24 is formed from the inlet 21 to the outlet 22 with the bulging portion facing each other, and the tube group 17 is configured to pass through the flow path 24. The flow path 24 is formed by providing a plurality of hollow chambers 24a partitioned along the longitudinal direction and communication paths 24b alternately communicating side ends of the adjacent hollow chambers 24a, and flows in from the inlet 21. The water supply is configured to circulate in a meandering manner in the flow passage 24 and to flow out of the outlet 22.

This heat exchanger uses a copper material for all members on the primary side and the secondary side or a member to be joined, assembles each member, installs a brazing material at a predetermined position, and places this in an electric furnace. , And joined together, and can be manufactured in a single brazing process.

The heat exchanger manufactured as described above can be used as a single unit. However, this heat exchanger is used as a unit, and a plurality of units are connected in parallel to form a heat exchanger having a required multiple capacity. It is possible to make an exchanger.

[0010]

The heat exchanger of the present invention is constructed as described above, and has one header 12 having the refrigerant inlet 11 opened.
And the other header 14 having the refrigerant outlet 13 opened to join the two open ends of a tube group 17 in which a number of capillary tubes 16 are arranged in parallel to form a primary side, which is sufficiently resistant to a high-pressure gas refrigerant. With a simple structure and no need for special processing, the use of copper
Since it is possible to perform brazing in an electric furnace and to join them all at once, it is possible to significantly reduce manufacturing costs.

Further, since the tube group 17 is formed so as to penetrate the flow passage 24, a large effective area for heat exchange can be taken, and the heat efficiency is extremely excellent.

Further, since the heat exchanger of the present invention is formed to be extremely thin, a space for installation can be saved. The heat exchanger thus formed is used as a unit, and a plurality of the units are connected in parallel. Thus, it is possible to manufacture a heat exchanger having a necessary multiple of capacity.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is an exploded perspective view.

[Description of Signs] 11 inlet 12 header 13 outlet 14 header 16 capillary tube 17 tube group 20 plate 21 inlet 22 outlet 24 flow passage

Claims (2)

[Claims] 1. A heat exchanger configured to exchange heat between a primary side through which a refrigerant flows and a secondary side through which water of a fluid to be heated flows, comprising: a header 12 having an opening 11 for a refrigerant; A tube group 17 is formed by joining two open ends of a tube group 17 in which a number of capillary tubes 16 are arranged in parallel to the other header 14 having an outlet 13 opened, and forming a primary side. The tube group 17 penetrates through the flow passage 24 by sandwiching the peripheral edge of the tube group 17 to form a flow passage 24 extending from an inlet 21 opened at one end to an outlet 22 opened at the other end. Heat exchanger configured. 2. The heat exchanger according to claim 1, wherein the heat exchanger is formed using a copper material and brazed in an electric furnace.