CN201897350U - Novel shell-and-tube heat exchanger - Google Patents

Abstract

The utility model discloses a novel shell-and-tube heat exchanger, which comprises a heat exchanger body. A coolant inlet and a coolant outlet are arranged on the heat exchanger body, and a coolant flowing direction switching device which is capable of leading the coolant to flow into the heat exchanger body through the coolant inlet and leading the coolant to flow out of the heat exchanger body through the coolant outlet under both refrigerating and heating working conditions is arranged on the heat exchanger body. The novel shell-and-tube heat exchanger is simple and reliable in structure and low in cost and capable of realizing that the coolant flows into the heat exchanger from the coolant inlet no matter an air conditioner is in refrigerating or heating, and accordingly accumulation of excessive compressor oil inside the heat exchanger is avoided.

Description

A New Type Shell-and-Tube Heat Exchanger

technical field

The utility model relates to a novel shell and tube heat exchanger used in an air conditioner.

Background technique

With the advancement of processing technology, shell and tube heat exchangers are developing in the direction of miniaturization and high efficiency, and have been widely used in the fields of household central air conditioners and commercial air conditioners. At present, the common shell-and-tube heat exchangers on the market are ordinary shell-and-tube heat exchangers or a heat exchanger with a liquid storage function added on the basis of ordinary shell-and-tube heat exchangers. The latter is more suitable for refrigerant Air-conditioning systems with long pipelines, large refrigerant charges, and large changes in refrigerant demand greatly enhance the market competitiveness of shell-and-tube heat exchangers. However, the above-mentioned heat exchangers are only suitable for cooling-only or heat-only air conditioners, because the flow direction of the refrigerant side entering and leaving the shell-and-tube heat exchanger will change after the four-way valve of the cooling and heating switching air conditioner is reversed. That is to say, if the refrigerant enters from the upper end of the shell-and-tube heat exchanger during heating, the refrigerant will enter from the bottom of the shell-and-tube heat exchanger during cooling. If it enters from the bottom of the shell-and-tube heat exchanger, the flow rate of the refrigerant inside the shell-and-tube heat exchanger decreases sharply, and the compressor oil accumulated inside the heat exchanger cannot be brought back to the compressor, and the air conditioner will run out of compressor for a long time. oil, system reliability cannot be guaranteed.

Utility model content

In order to solve the above technical problems, the utility model provides a new shell-and-tube heat exchanger.

Its technical solutions are:

A new type of shell-and-tube heat exchanger, including a heat exchanger body, a refrigerant inlet and a refrigerant outlet are arranged on the heat exchanger body, and the heat exchanger body is also provided with a Under working conditions, the refrigerant that flows into the heat exchanger body through the refrigerant inlet and flows out of the heat exchanger body through the refrigerant outlet flows to the conversion device.

The above-mentioned refrigerant flow conversion device includes two input/output pipelines, one of which is connected to two branch pipelines, one branch pipeline is provided with a conduction check valve, and the other branch pipeline is provided with a cut-off valve. The other input/output pipeline is also connected to two branch pipelines, one branch pipeline is provided with a conduction one-way valve, and the other branch pipeline is provided with a cut-off one-way valve; both of them are set The two branch pipelines of the conducting one-way valve are connected and then connected to the refrigerant inlet, and the two branch pipelines of the cut-off one-way valve are connected and then connected to the refrigerant outlet.

The beneficial technical effect of the utility model is:

When the utility model realizes the refrigeration or heating of the air conditioner, the refrigerant flows into the heat exchanger body from the refrigerant inlet, so that there is no excessive compressor oil accumulation inside the heat exchanger body; moreover, the utility model has a simple and reliable structure and low cost. Only four one-way valves are needed, and no control signal is needed; in addition, the utility model does not need to change the previous circuit part, which can greatly shorten the product development cycle.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment the utility model is further described:

Fig. 1 is the structural schematic diagram of the utility model.

Detailed ways

Referring to Fig. 1, a new type of shell-and-tube heat exchanger includes a heat exchanger body 1, a refrigerant inlet is arranged at the upper end of the heat exchanger body 1, and a refrigerant outlet is arranged at the bottom of the heat exchanger body 1. The heat exchanger body 1 is also provided with a refrigerant flow conversion device 2 for adjusting the refrigerant flow into the heat exchanger body through the refrigerant inlet and out of the heat exchanger body through the refrigerant outlet under both cooling and heating conditions.

The above-mentioned refrigerant flow conversion device 2 includes two input/output pipelines A and B, wherein the A input/output pipeline is connected to two branch pipelines, and a conductive first one-way valve 201 is provided on one branch pipeline. Another branch pipeline is provided with a cut-off second one-way valve 202; the B input/output pipeline is also connected to two branch pipelines, one branch pipeline is provided with a conduction third one-way valve 203, and the other branch pipeline A fourth one-way valve 204 is provided on the road. The first one-way valve 201 and the third one-way valve 203 are connected to the refrigerant inlet, and the second one-way valve 202 and the fourth one-way valve are set on it. The two branch pipelines of 204 are connected to the refrigerant outlet after being connected.

As shown in FIG. 1 , the solid line arrows indicate the flow direction of the refrigerant in the pipeline during cooling, and the dotted line arrows indicate the flow direction of the refrigerant in the pipeline during heating. When cooling: the refrigerant flows in from the A end, the first one-way valve 201 conducts, the second one-way valve 202 does not conduct, flows into the heat exchanger body 1 from the upper end of the shell-and-tube heat exchanger body 1, and the heat exchange is completed Then it flows out from the bottom, the fourth one-way valve 204 is turned on, and the refrigerant flows out from the B end; after the heat exchange, the pressure of the refrigerant decreases, and neither the second one-way valve 202 nor the third one-way valve 203 can be turned on. During heating: the refrigerant flows in from the B end, the third one-way valve 203 conducts, and the fourth one-way valve 204 does not conduct, and flows into the heat exchanger body 1 from the upper end of the shell-and-tube heat exchanger body 1, exchanging heat After the completion, it flows out from the bottom, the second one-way valve 202 is connected, and flows out from the A end; after the heat exchange, the pressure of the refrigerant decreases, and the first one-way valve 201 and the fourth one-way valve 204 cannot be connected.

Likewise, this embodiment can be extended to heat exchanger structures that have requirements on the flow direction of the heat exchanger.

It should be noted that any equivalent or obvious modification made by those skilled in the art under the teaching of this specification shall fall within the protection scope of the present utility model.

Claims (2)

1. A new type of shell-and-tube heat exchanger, including a heat exchanger body, on which a refrigerant inlet and a refrigerant outlet are arranged, and it is characterized in that: the heat exchanger body is also provided with an adjustable refrigeration unit. The refrigerant flows into the heat exchanger body from the refrigerant inlet and flows out of the heat exchanger body from the refrigerant outlet to the conversion device under both cooling and heating conditions. 2. A new type of shell-and-tube heat exchanger according to claim 1, characterized in that: the refrigerant flow conversion device includes two input/output pipelines, one of which connects two branches Pipeline, one branch pipeline is provided with a conduction one-way valve, and the other branch pipeline is provided with a cut-off one-way valve; the other input/output pipeline is also connected to two branch pipelines, and one branch pipeline is provided with a The one-way valve that conducts, and the other branch pipeline is provided with a one-way valve that is cut off; the two branch pipelines that are provided with one-way valves that are both connected are connected to the refrigerant inlet, and the two branch pipelines that are set on both of them are connected to the refrigerant inlet. The two branch pipelines of the one-way valve are connected and connected to the refrigerant outlet.

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