JPS5952352B2 - Refrigerator heat exchanger with multistage compression economizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a heat exchanger used in a refrigerator with a multi-stage compression economizer.

[Background of the invention]

A conventional heat exchanger for a refrigerator with a two-stage compression economizer shown in FIG. 1 will be explained.

The condenser 1 and the economizer 5 are connected by a refrigerant liquid pipe 3, and the economizer 5 and the evaporator 9 are connected by a refrigerant liquid pipe 11.

The end of the refrigerant liquid pipe 3 on the economizer 5 side, the refrigerant liquid pipe 1
An orifice 4° 1 is provided at the end of each evaporator 9 on the evaporator 9 side.
0 is set.

A heat exchanger tube 2 for circulating cooling water is housed in the condenser 1, an eliminator 6 is installed in the economizer 5, a heat exchanger tube 7 is housed in the evaporator 9, and an eliminator 8 is attached. There is.

The discharge gas fed from the compressor (not shown) is condenser 1.
The heat exchanger tubes 2 are cooled by the cooling water passing through the heat transfer tubes 2, and condensed into liquid.

The liquefied refrigerant is guided to the economizer 5 via the refrigerant liquid pipe 3.

At this time, the refrigerant liquid is expanded under reduced pressure by the orifice 4, and a part of it evaporates.

Then, the evaporated refrigerant is separated into droplets while passing through the eliminator 6, and is sucked into the two-stage impeller of the compressor.

Further, the cooled refrigerant liquid is guided to the evaporator 9 through a refrigerant liquid pipe 11.

At this time, the refrigerant liquid is expanded under reduced pressure by the orifice 10, exchanges heat with the cold water passing through the heat transfer tube 7, and evaporates.

The evaporated refrigerant is separated into droplets while passing through the eliminator 8 and is sucked into the impeller at one stage of the compressor.

In a conventional heat exchanger, the condenser 1 and the economizer 5, and the condenser 1 and the evaporator 9 are each integrally constructed, but these are not all integrated, and the peripheral wall of the condenser 1 is exposed. ing.

Therefore, not only may refrigerant leak from the piping joints used to communicate these parts, but the structure is complicated and assembly is time-consuming.

Further, the refrigerant gas noise generated from the condenser 1, particularly the part where the compressed gas flows into the condenser, is high, and in order to block this sound, soundproofing measures such as applying soundproofing material are required.

Furthermore, the height of the economizer is smaller than the height from the lower end of the evaporator to the upper end of the condenser, and the distance from the refrigerant liquid level of the economizer to the eliminator cannot be made sufficiently large.

Therefore, the eliminator cannot effectively separate droplets floating near the refrigerant liquid surface, resulting in mist-up.

Mist-up not only reduces cooling capacity but also
It is sucked into the compressor and collides with the compressor's impeller, causing wear and tear.

[Purpose of the invention]

An object of the present invention is to provide a heat exchanger that produces less gas noise from a condenser and can suppress mist build-up.

[Summary of the invention]

The feature of this invention is that an outer wall is joined to the outer side of the circumferential wall housing the condenser and the evaporator to form an economizer having a chamber extending from the upper end side of the circumferential wall to the lower end side, and the outer wall is connected to the circumferential wall of the condenser. and part of the peripheral wall of the evaporator.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be explained with reference to FIG.

The condenser 21, the economizer 22 disposed outside the condenser 21, and the evaporator 23 are integrally constructed.

A heat transfer tube 24 through which cooling water flows is housed inside the condenser 21, and a gas port 25 is provided at the upper part of the peripheral wall.

The economizer 22 is formed by a peripheral wall that houses the condenser 21 and the evaporator 23, and an outer wall 34 that is connected to the upper and lower ends of the peripheral wall. It has a chamber extending from the bottom end to the bottom end.

An eliminator 26 is attached to the upper part of the economizer 22, and a gas outlet 27 is provided at the upper part of the outer wall.

Inside the evaporator 23, a heat exchanger tube 28 is housed and an eliminator 29 is attached, and a gas outlet 34 is formed in the upper part of the peripheral wall.

The inside of the condenser 21 and the inside of the economizer 22 are connected to the passage 3.
The inside of the bottom of the evaporator 23 and the bottom of the economizer 22 are connected through a flash duct 32.

Orifices 31 and 33 are provided at the end of the passage 30 on the economizer 22 side and at the end of the flash duct 32 on the economizer 22 side, respectively.

The refrigerant gas discharged from the compressor is transferred from the gas population 25 to the condenser 2.
1 and is cooled by the cooling water passing through the heat transfer tubes 24 to condense and liquefy.

The liquefied refrigerant passes through the orifice 31 of the passage 30 and expands under reduced pressure, and a portion of it evaporates.

The evaporated refrigerant is separated into droplets while passing through the eliminator 26, and is sucked into the second-stage impeller of the compressor through the gas outlet 27.

On the other hand, the cooled refrigerant expands under reduced pressure through the orifice 33, enters the evaporator 23 through the hole in the flash duct 32, exchanges heat with the cold water passing through the heat transfer tube 28, and evaporates.

Then, the evaporated refrigerant is separated into droplets while passing through the eliminator 29, and is sucked into the first-stage impeller of the compressor from the gas outlet 34.

〔Effect of the invention〕

As explained above, the heat exchanger of the present invention includes a condenser,
Since the economizer and evaporator are constructed in one piece, there is no need for refrigerant liquid piping to connect the condenser and economizer, and the economizer and evaporator, making assembly easy.

In addition, by arranging the economizer, which generates the least noise among the condenser, evaporator, and economizer, outside the condenser 21, especially the gas port 25, the gas noise generated from around the gas port 25 of the condenser 21 is blocked. , noise is significantly reduced.

In addition, since the height of the economizer chamber can be made as large as the height of the surrounding wall that houses the condenser and evaporator, the eliminator can be placed in a position away from the liquid droplets filling the vicinity of the refrigerant liquid level in the economizer. This can suppress the phenomenon of droplets passing through the eliminator, that is, mist-up.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional heat exchanger for a refrigerator with a two-stage compression economizer, and FIG. 2 is a sectional view showing an embodiment of the heat exchanger for a refrigerator with a two-stage compression economizer according to the present invention. .

Claims (1)

[Claims] 1. In a heat exchanger that integrates a condenser with a refrigerant inlet, an evaporator with a refrigerant outlet, and an economizer that is connected to the condenser and evaporator through pressure reduction means, the condenser and evaporator are An outer wall is joined to the outside of the housed surrounding wall to form an economizer having a chamber extending from the upper end side to the lower end side of the surrounding wall between the surrounding wall and the outer wall, and the outer wall is perpendicular to the longitudinal direction of the heat exchanger. 1. A heat exchanger for a refrigerator/heater with a multistage compression economizer, characterized in that the heat exchanger for a refrigerator/heater with a multistage compression economizer surrounds the entire circumferential wall of a condenser and a part of the circumferential wall of an evaporator on a cross section.