JPH04240394A - Heat exchanger for refrigeration - Google Patents

Abstract

PURPOSE:To provide a heat exchanger for refrigeration, in which clogging period of time due to frosting is elongaged to reduce the number of times of defrosting and excellent defrosting efficiency is obtained, in the heat exchanger for refrigeration, which cools ventilated air and accompanies frosting on the surface thereof, such as a refrigerating evaporator for a freezing refrigerator, refrigerating showcase and the like. CONSTITUTION:The pitch P1 of refrigerant pipe 4, orthogonal to first row fins 6 and penetrating them, is made larger than the pitch P of the refrigerant tube 4, orthogonal to fins after a second row and penetrating them.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration heat exchanger that cools ventilated air and causes frost to form on its surface, such as a refrigeration evaporator for a refrigerator-freezer or a refrigeration showcase.

0002

BACKGROUND OF THE INVENTION In recent years, in order to save power by extending the defrost cycle time of refrigerator-freezers and freezer showcases, there has been a demand for heat exchangers for refrigeration that have a longer time for clogging due to frost formation. Additionally, there is a strong desire for compact refrigeration heat exchangers to improve volumetric efficiency. Conventional refrigeration heat exchangers generally have a configuration shown in Japanese Utility Model Application Publication No. 57-120889.

A conventional refrigeration heat exchanger will be explained below with reference to the drawings. FIG. 4 is a plan view of a conventional refrigeration heat exchanger. In FIG. 4, 1 is the first row of fins, 2
3 is the second row of fins, and 3 is the last row of fins, each of which cools the air. Reference numeral 4 denotes a refrigerant pipe that extends perpendicularly to and penetrates the fins to cool the fins. 5 is an end plate that holds the refrigerant pipe 4.

The operation of the refrigeration heat exchanger constructed as described above will be explained below. In order to increase heat exchange efficiency, the first row of fins 1, the second row of fins, and the last row of fins 3 through which the refrigerant pipes 4 pass are made independent with a slight distance l in the air inflow direction (indicated by the arrow). The first row of fins 1 on the air inflow side are arranged sparsely, and the second row fins 2 and the last fins 3 are arranged densely. Also, refrigerant pipe 4
are regularly arranged with a pipe pitch P. The air flowing into the refrigeration heat exchanger is cooled by the first row of fins, the second row of fins, and the final fin, and then supplied to the inside of a refrigerator-freezer (not shown).

[0005]

[Problems to be Solved by the Invention] However, with the above configuration, the first problem is that the amount of frost builds up on the first row of fins, which have the largest amount of cooling, and even though the fin pitch is sparse, Regardless, the problem is that clogging due to frost occurs in a relatively short period of time, increasing the number of defrosting operations, and deteriorating defrosting efficiency.

[0006] A second problem with the above configuration is that in the gap S between the first row of fins and the second row of fins, where the amount of cooling is large, the airflow changes due to the effect of the fin pitch becoming denser than that of the sparse one, causing frost to form. This has led to problems in that frost tends to form, clogging occurs in a relatively short period of time, the number of defrost operations increases, and defrost efficiency deteriorates.

[0007] A third problem is that in the above configuration, the heat exchange efficiency of the last row of fins 3, which has the least amount of cooling, is poor, and the fin surface area is not effectively used, and the heat exchanger for refrigeration, which has a large volume, has poor heat exchange efficiency. Because it is a container, it has the problem of reducing the volumetric efficiency of refrigerators, freezers, etc.

[0008]

[Means for Solving the Problems] In order to solve the first problem, the present invention provides a system in which a large number of devices are arranged in parallel, each row is independent in the air inflow direction, and each row is connected to an air outlet from the air inflow side. The refrigerant pipe is composed of fins arranged from sparse to dense in order from side to side, and a refrigerant pipe that penetrates and intersects perpendicularly to these, and that perpendicularly intersects and penetrates a first row of fins located on the air inflow side among the fins. The pipe pitch of the refrigerant pipes is made larger than the pipe pitch of the refrigerant pipes that are perpendicular to and pass through the fins in the second and subsequent rows.

In order to solve the second problem, the present invention arranges a large number of air filters in parallel, each row is independent in the air inflow direction, and each row is sequentially arranged from sparse to dense from the air inflow side to the air outflow side. The air outflow side edge of the first row of fins located on the air inflow side among the fins and the air inflow side of the second row of fins This configuration has a configuration in which the interval between edges is made longer than the fin pitch of the second row of fins.

[0010] In order to solve the third problem, the present invention arranges a large number of air filters in parallel, each row is independent with respect to the air inflow direction, and each row is sequentially arranged from sparse to dense from the air inflow side to the air outflow side. The pitch of the refrigerant pipes perpendicular to and penetrating the last row of fins located on the air outflow side among the fins is defined as the last row. This structure is such that the pipe pitch is smaller than the pipe pitch of the refrigerant pipes that intersect perpendicularly to the fins located on the windward side and pass through them.

[0011]

[Function] With the above-described configuration, the present invention has a large frosting space even if the first row of fins, which have the largest amount of cooling, has a large amount of frost, thereby extending the time for clogging due to frosting and reducing the number of defrost operations. Defrost efficiency can be improved.

[0012] Furthermore, even if frost forms due to the effect of changing the fin pitch from sparse to dense, the frost formation space becomes larger, so the time for clogging due to frost formation can be extended, the number of defrost operations can be reduced, and the defrost efficiency can be improved. can.

Furthermore, by effectively utilizing the fin surface area, a compact refrigeration heat exchanger can be realized, and the volumetric efficiency of refrigerator-freezers and the like can be improved.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the first aspect of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a refrigeration heat exchanger according to an embodiment of the first invention. In FIG. 1, components that are the same as those of the prior art are designated by the same reference numerals and detailed explanation thereof will be omitted. In FIG. 1, 6 is a first row of fins that cools the air.

A refrigeration heat exchanger according to an embodiment of the present invention constructed as described above will be explained. In order to increase heat exchange efficiency, the refrigerant pipe 4 separates the penetrating first row fins 1, second row fins 2, and last row fins 3 with a slight distance l in the air inflow direction (indicated by the arrow). The first row of fins 1 on the air inflow side are arranged sparsely, and the second row fins 2 and the last fins 3 are arranged densely.

When air enters, it contacts each row of fins,
The air is cooled and frost forms on each row of fins. Since the amount of frost builds up on the first row of fins, which have the largest amount of cooling, the pipe pitch P1 of the refrigerant pipes that are perpendicular to and penetrate the first row of fins located on the air inflow side is set to be perpendicular to the second and subsequent rows of fins. However, by making it larger than the pipe pitch P of the refrigerant pipes passing through,
The frosting space can be enlarged and the time for clogging due to frosting can be extended.

[0017] These actions can extend the time for clogging due to frost formation, reduce the number of defrost operations, and improve defrost efficiency.

Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a plan view of a refrigeration heat exchanger according to an embodiment of the second invention. In FIG. 2, components that are the same as those of the prior art are designated by the same reference numerals and detailed explanation thereof will be omitted.

A refrigeration heat exchanger according to an embodiment of the present invention constructed as described above will be explained. In order to increase heat exchange efficiency and defrost efficiency, the distance between the first row of fins and the second row of fins is l1 in the air inflow direction (indicated by the arrow), and the distance between the second row of fins and the last row of fins is set to l. The first row of fins on the air inflow side are arranged sparsely, and the second row fins 2 and the last fins 3 are arranged densely.

When air enters, it contacts each row of fins,
As the air is drawn in, frost forms on each row of fins. Gap S1 (
(shown by the broken line), the airflow changes due to the effect of the fin pitch changing from sparse to dense, making it easier for frost to form. By increasing the interval l1 between the inflow side edges to a length equal to or greater than the fin pitch P2 of the second row of fins, S1
It is possible to increase the space for frost formation and extend the time for clogging due to frost formation.

[0021] These actions can extend the time for clogging due to frost formation, reduce the number of defrost operations, and improve defrost efficiency.

Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a plan view of a refrigerator/freezer exchanger according to an embodiment of the third invention. In FIG. 3, components that are the same as those of the prior art are denoted by the same reference numerals, and detailed explanation thereof will be omitted.

In FIG. 3, 7 is the last row of fins for cooling the air. A refrigeration heat exchanger according to an embodiment of the present invention configured as described above will be explained.

In order to increase heat exchange efficiency, the refrigerant pipe 4 passes through the first row of fins 1, the second row of fins 2, and the last row of fins 7.
are separated from each other by a slight distance l in the air inflow direction (indicated by the arrow), and the first row of fins 1 on the air inflow side are sparsely spaced, and the second row fins 2 and the last fins 3 are successively denser. It is arranged like this.

When air flows in, it contacts each row of fins,
The air is cooled and frost forms on each row of fins. The last row of fins 3, which have the lowest amount of cooling and the least amount of frost formation, have a poor heat exchange rate and the fin surface area is not effectively used. By making the pipe pitch P3 smaller than the pipe pitch P of the refrigerant pipes that are perpendicular to and penetrate the fins located on the windward side of the last row, the volume of the refrigeration heat exchanger can be reduced without reducing the amount of cooling. be able to.

[0026] These effects make it possible to realize a compact refrigeration heat exchanger and improve the volumetric efficiency of refrigerator-freezers and the like.

[0027]

[Effects of the Invention] As described above, the present invention has many parallel
Each row is made independent in the air inflow direction, and each row is made up of fins arranged sequentially from sparse to dense from the air inflow side to the air outflow side, and a refrigerant pipe that penetrates and intersects perpendicularly to these fins. A pipe pitch of the refrigerant pipes that perpendicularly intersect and penetrate the first row of fins located on the air inflow side among the fins is made larger than a pipe pitch of the refrigerant pipes that perpendicularly intersect and penetrate the second and subsequent rows of fins. As a result, the time for clogging due to frost formation can be extended, the number of defrost operations can be reduced, and a refrigeration heat exchanger with high defrost efficiency can be provided.

[0028] Also, a large number of fins are arranged in parallel, each row is independent in the air inflow direction, and each row is sequentially arranged from sparse to dense from the air inflow side to the air outflow side; The interval between the air outflow side edge of the first row of fins located on the air inflow side and the air inflow side edge of the second row of fins, which are composed of penetrating refrigerant pipes, is defined as the fin pitch of the second row of fins. By increasing the length to be equal to or longer than , it is possible to extend the time for clogging due to frost formation and reduce the number of times of defrosting, thereby providing a refrigeration heat exchanger with good defrosting efficiency.

Further, a large number of fins are arranged in parallel, each row is independent in the air inflow direction, and each row is sequentially arranged from sparse to dense from the air inflow side to the air outflow side, and perpendicular to these fins, The pipe pitch of the refrigerant pipes is perpendicular to the last row of fins located on the air outflow side of the fins, and the pipe pitch of the refrigerant pipes is perpendicular to the fins located on the windward side of the last row. By making the pipe pitch smaller than the pipe pitch of the refrigerant pipes, it is possible to realize a compact refrigeration heat exchanger and provide a refrigeration heat exchanger that improves the volumetric efficiency of refrigerator-freezers and the like.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a refrigeration heat exchanger according to an embodiment of the present invention.

[
FIG. 2: A plan view of a refrigeration heat exchanger according to a second embodiment of the present invention

FIG. 3 is a plan view of a refrigeration heat exchanger according to a third embodiment of the present invention.

[Figure 4] Plan view of a conventional refrigeration heat exchanger

[Explanation of symbols]

1,6 First row fins 2 Second row fins 4 Refrigerant pipe 7 Last row fin

Claims (3)

[Claims] 1. A large number of fins arranged in parallel, each row being independent in the air inflow direction, and arranged in each row sequentially from sparse to dense from the air inflow side to the air outflow side, and perpendicular to these fins, The refrigerant pipe is composed of penetrating refrigerant pipes, and the pipe pitch of the refrigerant pipes is perpendicular to the first row of fins located on the air inflow side of the fins, and the pipe pitch of the refrigerant pipes is perpendicular to the second and subsequent rows of fins. A refrigeration heat exchanger characterized by having a pitch larger than the pipe pitch of the pipes. 2. A large number of fins arranged in parallel, each row being independent in the air inflow direction, and arranged in each row sequentially from sparse to dense from the air inflow side to the air outflow side, and perpendicular to these fins, The interval between the air outflow side edge of the first row of fins located on the air inflow side and the air inflow side edge of the second row of fins, which are composed of penetrating refrigerant pipes, is defined as the fin pitch of the second row of fins. A refrigeration heat exchanger characterized by having a length equal to or longer than that of the refrigeration heat exchanger. 3. A large number of fins arranged in parallel, each row being independent in the air inflow direction, and arranged in each row sequentially from sparse to dense from the air inflow side to the air outflow side, and perpendicular to these fins, The pipe pitch of the refrigerant pipes is perpendicular to the last row of fins located on the air outflow side of the fins, and the pipe pitch of the refrigerant pipes is perpendicular to the fins located on the windward side of the last row. A refrigeration heat exchanger characterized by having a pipe pitch smaller than that of refrigerant pipes.