A modular plate-type double-evaporator water source heat pump unit with two-position three-way

Abstract

The present invention proposes a modular plate-type dual-evaporator water source heat pump unit with two-position three-way valves, wherein the heat source water outlet on evaporator one is connected to the heat source water inlet on evaporator two; the refrigerant outlets on evaporator one and evaporator two are connected to the compressor inlet through refrigerant pipeline one, and the compressor outlet is connected to the high-pressure refrigerant inlet through refrigerant pipeline two; three-way valve one and three-way valve four are respectively provided on refrigerant pipeline one and refrigerant pipeline two, and three-way valve one is also connected to refrigerant pipeline one, and three-way valve two is also connected to refrigerant pipeline two; three-way valve two is also provided on refrigerant pipeline three between the high-pressure refrigerant outlet and the filter, and three-way valve three is provided on the supply pipeline of the rear section of the expansion valve, and three-way valve two is also connected to the supply pipeline, and three-way valve three is also connected to refrigerant pipeline three. Its beneficial effect is that the modular plate-type dual-evaporator water source heat pump unit with two-position three-way valves can realize the full recovery of waste heat resources of wastewater with higher temperature.

Description

Technical Field

[0001] The invention relates to the field of waste heat utilization, in particular to a modular plate-type double-evaporator water source heat pump unit with two-position three-way. Background Art

[0002] The waste heat resources generated by production and life have not been fully utilized during the country's rapid development stage. With the continuous improvement of the country's environmental protection requirements in recent years, the recovery technology of waste heat resources in wastewater and exhaust gas has been increasingly valued by enterprises and institutions. At this stage, the utilization of waste heat resources from wastewater is mostly based on heat pump technology relying on shell and tube heat exchangers. The heat is extracted through forced heat exchange of waste heat sources by heat pump units. According to relevant standards, the basic usage scenario of heat pump units is to reduce the waste heat resources of wastewater at about 15 degrees to 7 degrees. When an enterprise has a high-temperature heat source, the heat is often not fully recovered, resulting in a large amount of resource waste.

[0003] Some companies recover high-temperature heat sources by connecting multiple heat pump units in series. However, the operating conditions of each heat pump unit connected in series in this way are different. When one of them fails, the recovery efficiency of subsequent units will be greatly reduced.

[0004] The disadvantages are:

[0005] 1. The existing shell and tube heat exchanger of heat pump units cannot meet various heating needs in different seasons and regions;

[0006] 2. The complete set of units is installed centrally, which is not conducive to maintenance, cleaning and replacement;

[0007] 3. It is impossible to realize the replacement of hot and cold demand. Summary of the invention

[0008] In order to solve the problems existing in the prior art, the present invention provides a modular plate-type double-evaporator water source heat pump unit with two-position three-way.

[0009] The technical solution of the present invention is achieved in this way:

[0010] A modular plate-type double-evaporator water source heat pump unit with two-position three-way, comprising: a condenser, a compressor, an evaporator 1 and an evaporator 2, wherein the condenser is provided with a preheated water inlet, a preheated water outlet, a high-pressure refrigerant inlet and a high-pressure refrigerant outlet;

[0011] The evaporator 1 and the evaporator 2 are both provided with a heat source water outlet and a heat source water inlet as well as a refrigerant outlet and a refrigerant inlet. The heat source water outlet on the evaporator 1 is connected to the heat source water inlet on the evaporator 2; the refrigerant outlets on the evaporator 1 and the evaporator 2 are connected to the inlet of the compressor through the refrigerant pipeline 1, and the outlet of the compressor is connected to the high-pressure refrigerant inlet through the refrigerant pipeline 2;

[0012] The high-pressure refrigerant outlet is connected to a filter, and the filter is also connected to a liquid storage tank, and the liquid storage tank is connected to the refrigerant inlets on the evaporator 1 and the evaporator 2 through a supply pipeline, and an expansion valve is also provided on the supply pipeline;

[0013] A three-way valve 1 and a three-way valve 4 are respectively provided on the refrigerant pipeline 1 and the refrigerant pipeline 2, the three-way valve 1 is also connected to the refrigerant pipeline 1, and the three-way valve 4 is also connected to the refrigerant pipeline 2;

[0014] A three-way valve 2 is also provided on the refrigerant pipeline 3 between the high-pressure refrigerant outlet and the filter, and a three-way valve 3 is provided on the supply pipeline at the rear section of the expansion valve. The three-way valve 2 is also connected to the supply pipeline, and the three-way valve 3 is also connected to the refrigerant pipeline 3.

[0015] Furthermore, the three-way valve 1 is connected to the refrigerant pipeline 1 at the rear section of the three-way valve 4 through a pipeline, and the three-way valve 4 is connected to the refrigerant pipeline 2 at the rear end of the three-way valve 1 through a pipeline.

[0016] Furthermore, the three-way valve 2 is connected to the supply pipeline in the front section of the three-way valve 3 through a pipeline, and the three-way valve 3 is connected to the refrigerant pipeline 3 between the three-way valve 2 and the filter through a pipeline.

[0017] Furthermore, the filter is a dry filter.

[0018] The beneficial effects of the present invention are:

[0019] 1. Inside the modular unit, each component is fixed and installed separately, and each component is independent of each other. Space is reserved for technicians to perform separate maintenance on the components;

[0020] 2. The modular unit adopts plate heat exchanger, which is smaller and lighter than shell and tube heat exchanger with the same heat exchange area;

[0021] 3. The modular installation feature allows technicians to dismantle and replace problematic components without dismantling the entire unit, greatly improving maintenance efficiency and reducing labor intensity;

[0022] 4. The modular plate-type double-evaporator water source heat pump unit with two-position three-way can fully recover the waste heat resources of wastewater with higher temperature;

[0023] 5. If the modular plate-type double-evaporator water source heat pump unit with two-position three-way is applied to the central air-conditioning system of a building, the flow direction of the refrigerant in the system can be controlled through the electric valve in the refrigerant pipeline to achieve the effect of cooling in summer and heating in winter, so as to meet the different needs of users for cold and hot resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the structure of the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] like Figure 1 A modular plate-type double-evaporator water source heat pump unit with two-position three-way is shown, comprising: a condenser 1, a compressor 2, an evaporator 1 3 and an evaporator 2 4, and a preheated water inlet 9, a preheated water outlet 8, a high-pressure refrigerant inlet 7 and a high-pressure refrigerant outlet 16 are provided on the condenser 1;

[0028] Evaporator 1 3 and evaporator 2 4 are both provided with a heat source water outlet 11 and a heat source water inlet 12 as well as a refrigerant outlet 14 and a refrigerant inlet 13. The heat source water outlet 11 on evaporator 1 3 is connected to the heat source water inlet 12 on evaporator 2 4; the refrigerant outlet 14 on evaporator 1 3 and evaporator 2 4 is connected to the inlet of compressor 2 through refrigerant pipeline 1 21, and the outlet of compressor 2 is connected to the high-pressure refrigerant inlet 7 through refrigerant pipeline 2 22;

[0029] The high-pressure refrigerant outlet 16 is connected to the filter 5, which is a drying filter 5. The filter 5 is also connected to the liquid storage tank 6, which is connected to the refrigerant inlet 13 on the evaporator 1 3 and the evaporator 2 4 through the supply pipeline 15. An expansion valve 10 is also provided on the supply pipeline 15. The expansion valve 10 plays a role in throttling and reducing the pressure in the pipe. When the pressure is reduced, the temperature of the refrigerant will be further reduced, so that the heat absorption effect of the refrigerant in the final initiation is better;

[0030] A three-way valve 17 and a three-way valve 4 18 are respectively provided on the refrigerant pipeline 1 21 and the refrigerant pipeline 2 22. The three-way valve 1 17 is also connected to the refrigerant pipeline 1 21, and the three-way valve 4 18 is connected to the refrigerant pipeline 2 22;

[0031] A three-way valve 2 19 is also provided on the refrigerant pipeline 3 23 between the high-pressure refrigerant outlet 16 and the filter 5 , and a three-way valve 3 20 is provided on the supply pipeline 15 at the rear section of the expansion valve 10 . The three-way valve 2 19 is also connected to the supply pipeline 15 , and the three-way valve 3 20 is also connected to the refrigerant pipeline 3 23 .

[0032] The three-way valve 17 is connected to the refrigerant pipeline 1 21 at the rear section of the three-way valve 4 18 through a pipeline, and the three-way valve 4 18 is connected to the refrigerant pipeline 2 22 at the rear end of the three-way valve 1 17 through a pipeline.

[0033] The three-way valve 2 19 is connected to the supply pipeline 15 in front of the three-way valve 3 20 through a pipeline, and the three-way valve 3 20 is connected to the refrigerant pipeline 3 23 between the three-way valve 2 19 and the filter 5 through a pipeline.

[0034] The working process of the device is as follows:

[0035] Condenser 1, evaporator 1 3 and evaporator 2 4 are all heat exchange equipment. When only refrigerant pipeline 1 21, refrigerant pipeline 2 22, refrigerant pipeline 3 23 and supply pipeline 15 are opened, the pipeline between three-way valve 1 17 and refrigerant pipeline 1 21, the pipeline between three-way valve 4 18 and refrigerant pipeline 2 22, the pipeline between three-way valve 2 19 and supply pipeline 15, and the pipeline between three-way valve 3 20 and refrigerant pipeline 3 23 are closed, the heat source water enters evaporator 2 4 from the heat source water inlet 12, and the heat source water and the refrigerant are heated in the evaporator 2 4. Heat exchange is carried out in evaporator 2 4, and the heat source water after the exchange enters evaporator 1 3 for secondary exchange to become cooling water, and flows out from the heat source water outlet 11; the refrigerant becomes high-temperature refrigerant after heat exchange; the high-temperature and high-pressure refrigerant compressed by compressor 2 releases heat in condenser 1 to exchange heat with heating water, and the cooled refrigerant passes through filter 5 and enters liquid storage tank 6, and the refrigerant in liquid storage tank 6 passes through expansion valve 10 to re-enter evaporator 1 3 and evaporator 2 4 and exchanges heat with the water in the evaporator again.

[0036] When the three-way valve direct connection ports on refrigerant pipeline 1 21, refrigerant pipeline 2 22, refrigerant pipeline 3 23 and supply pipeline 15 are closed, so that the pipeline between three-way valve 1 17 and refrigerant pipeline 1 21, the pipeline between three-way valve 4 18 and refrigerant pipeline 2 22, the pipeline between three-way valve 2 19 and supply pipeline 15, and the pipeline between three-way valve 3 20 and refrigerant pipeline 3 23 are all connected, the roles of evaporator and condenser 1 are interchanged, and the refrigerant in condenser 1 is discharged through the evaporator 1. After heat exchange, it passes through three-way valve 2 19 and enters the liquid storage tank 6 through the supply pipeline 15. The refrigerant in the liquid storage tank 6 passes through the filter 5 and three-way valve 3 20 to enter the evaporator 1 3 and the evaporator 2 4. After the refrigerant undergoes heat exchange in the evaporator 1 3 and the evaporator 2 4, it passes through a part of the refrigerant pipeline from the refrigerant outlet 14 and then passes through the three-way valve 1 17 to enter the compressor 2. After being compressed by the compressor 2, it passes through the three-way valve 4 18 again to enter the condenser 1.

[0037] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A modular plate-type double-evaporator water source heat pump unit with two-position three-way, characterized in that: include: A condenser, a compressor, an evaporator 1 and an evaporator 2, wherein the condenser is provided with a preheated water inlet, a preheated water outlet, a high-pressure refrigerant inlet and a high-pressure refrigerant outlet; The evaporator 1 and the evaporator 2 are both provided with a heat source water outlet and a heat source water inlet as well as a refrigerant outlet and a refrigerant inlet. The heat source water outlet on the evaporator 1 is connected to the heat source water inlet on the evaporator 2; the refrigerant outlets on the evaporator 1 and the evaporator 2 are connected to the inlet of the compressor through the refrigerant pipeline 1, and the outlet of the compressor is connected to the high-pressure refrigerant inlet through the refrigerant pipeline 2; The high-pressure refrigerant outlet is connected to a filter, and the filter is also connected to a liquid storage tank, and the liquid storage tank is connected to the refrigerant inlets on the evaporator 1 and the evaporator 2 through a supply pipeline, and an expansion valve is also provided on the supply pipeline; A three-way valve 1 and a three-way valve 4 are respectively provided on the refrigerant pipeline 1 and the refrigerant pipeline 2, the three-way valve 1 is also connected to the refrigerant pipeline 1, and the three-way valve 4 is also connected to the refrigerant pipeline 2; A three-way valve 2 is also provided on the refrigerant pipeline 3 between the high-pressure refrigerant outlet and the filter, a three-way valve 3 is provided on the supply pipeline at the rear section of the expansion valve, the three-way valve 2 is also connected to the supply pipeline, and the three-way valve 3 is also connected to the refrigerant pipeline 3; The three-way valve 1 is connected to the refrigerant pipeline 1 at the rear section of the three-way valve 4 through a pipeline, and the three-way valve 4 is connected to the refrigerant pipeline 2 at the rear end of the three-way valve 1 through a pipeline; The three-way valve 2 is connected to the supply pipeline in the front section of the three-way valve 3 through a pipeline, and the three-way valve 3 is connected to the refrigerant pipeline 3 between the three-way valve 2 and the filter through a pipeline.

2. The modular plate-type double-evaporator water source heat pump unit with two-position three-way according to claim 1 is characterized in that: The filter is a dry filter.

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