Volume-variable heat exchanger suitable for refrigerating and heating double pipelines

Abstract

The utility model provides a capacity-variable heat exchanger suitable for refrigerating and heating double pipelines, which comprises a main heat exchanger A, an auxiliary heat exchanger B, a normally open solenoid valve, a one-way valve 6-1, a one-way valve 6-2 and pipelines with different pipe diameters, the main heat exchanger A is externally connected with a four-way valve through a first port, and the main heat exchanger A is externally connected with a heating loop B through a second port; the position, close to the main heat exchanger A, of the heating loop B is connected with a refrigerating loop A through a one-way valve 6-1, a normally-open electromagnetic valve is arranged in the heating loop B, the output end of the heating loop B is connected with a filter 5-1 through a one-way valve 6-2, the filter 5-1 is externally connected with a host throttling valve, and the input end of the refrigerating loop A is connected with the filter 5-1. According to the fluorine cycle unit provided with the variable-capacity heat exchanger, by adjusting the three parameters including the heat exchange capacity, the refrigerant amount, the flow velocity and the pipe diameter of the unit heat exchanger, the professional heating standard can be met, and meanwhile the professional refrigeration standard can be met.

Description

Technical Field

[0001] This utility model relates to the field of heat exchangers, and more particularly to a variable volume heat exchanger suitable for dual pipelines for both refrigeration and heating. Background Technology

[0002] For a long time, there has been a performance difference between air-cooled heat pump (chilled water) units used for professional refrigeration and air-cooled heat pump (hot water) units used for professional heating: the former has better cooling capacity and energy efficiency, while the latter has better heating capacity and energy efficiency.

[0003] In the current technology, there is a lack of a heat pump unit whose heating capacity and energy efficiency, as well as its cooling capacity and energy efficiency, can simultaneously meet the cooling standards of professional refrigeration units and the heating standards of professional heating units.

[0004] In the context of energy conservation and emission reduction, this invention provides a variable capacity heat exchanger that can be adapted to both cooling and heating pipelines, enabling heat pump (cold and hot water) units to simultaneously meet the aforementioned two professional standards. This is of great significance for reducing the construction costs and operating costs of cold and hot facilities. Therefore, this utility model proposes a corresponding technical solution. Utility Model Content

[0005] To address the technical deficiencies in the background technology, this utility model proposes a variable volume heat exchanger suitable for dual-pipeline cooling and heating, solving the aforementioned technical problems and meeting practical needs. The specific technical solution is as follows:

[0006] A variable volume heat exchanger suitable for dual-circuit cooling and heating includes a main heat exchanger A, an auxiliary heat exchanger B, a normally open solenoid valve, a check valve 6-1, a check valve 6-2, and pipes of different diameters. The main heat exchanger A is externally connected to a four-way valve through port 1. The main heat exchanger A is externally connected to a heating circuit B through port 2. The heating circuit B is connected to a cooling circuit A through check valve 6-1 near the main heat exchanger A. A normally open solenoid valve is installed in the heating circuit B. The output end of the heating circuit B is connected to a filter 5-1 through check valve 6-2. The filter 5-1 is externally connected to a main unit throttle valve. The input end of the cooling circuit A is connected to the filter 5-1. The output end of the filter 5-1 is connected to port 4 of the auxiliary heat exchanger. The auxiliary heat exchanger is connected to port 2 of the main heat exchanger through port 3.

[0007] Furthermore, one end is connected after the main throttling valve of the heat pump unit and the other end is connected before the four-way valve of the refrigerant circuit of the heat pump unit.

[0008] Furthermore, the main heat exchanger A and the auxiliary heat exchanger B have different heat exchange capacities. The main heat exchanger A, the auxiliary heat exchanger B, the one-way valve 6-1, the normally open solenoid valve, and the one-way valve 6-2 cooperate to form two heat exchanger combinations with different heat exchange capacities.

[0009] Furthermore, a branch is provided on the heating circuit B, and the branch is equipped with a balance tank, a liquid receiver, a flash evaporator, two filters 5-2 and a throttle valve. The branch is connected to an external compressor through another output end of the flash evaporator.

[0010] Furthermore, the heating circuit A and the cooling circuit B contain different amounts of refrigerant.

[0011] Furthermore, it can be used in fluorinated cycle refrigeration and heating systems such as air-cooled heat pump (chilled and hot water) units, air-cooled heat pump (heating and cooling) air conditioning units, air-cooled heat pump chillers, air-cooled heat pump hot water units, water (ground) source heat pump (chilled and hot water) units, and water (ground) source heat pump (heating and cooling) air conditioning units to improve their cooling and heating capabilities and energy efficiency.

[0012] Compared with the prior art, the variable volume heat exchanger for dual-pipeline cooling and heating provided by this utility model has the following beneficial effects:

[0013] This utility model discloses a variable volume heat exchanger suitable for dual-circuit cooling and heating systems, which is equipped with separate heating and cooling circuits. During cooling circuit operation, the main and auxiliary heat exchangers work simultaneously, resulting in higher heat exchange efficiency. The internal volume of the receiver, flash evaporator and its accessories, as well as related piping in the heating circuit, is closed, releasing refrigerant to participate in system operation and maximizing cooling efficiency. Furthermore, the cooling circuit contains no unnecessary electronic components, thus not affecting the cooling effect. During heating operation, the normally open solenoid valve de-energizes and opens, working in conjunction with a check valve to ensure the heating circuit is open while the cooling circuit is closed. The internal volume of the receiver, flash evaporator and its accessories, as well as related piping, is opened, allowing the refrigerant cycle unit equipped with this variable volume heat exchanger to simultaneously achieve professional heating and cooling standards. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a variable volume heat exchanger suitable for both refrigeration and heating dual pipelines according to this utility model.

[0015] Figure 2 This is a schematic diagram of the operation of a variable volume heat exchanger suitable for both refrigeration and heating dual pipelines according to this utility model. Detailed Implementation

[0016] In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "middle," and "inner," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," and "joined" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood through specific circumstances.

[0017] The embodiments of this utility model will be described below with reference to the accompanying drawings and related examples. The embodiments of this utility model are not limited to the following examples, and this utility model relates to relevant necessary components in this technical field, which should be regarded as well-known technology in this technical field and can be known and mastered by those skilled in this technical field.

[0018] See Figure 1 A variable volume heat exchanger suitable for dual-circuit cooling and heating systems includes a main heat exchanger A, an auxiliary heat exchanger B, a normally open solenoid valve, a one-way valve 6-1, a one-way valve 6-2, and pipes of different diameters. The main heat exchanger A is externally connected to a four-way valve through port 1. The main heat exchanger A is externally connected to a heating circuit B through port 2. The heating circuit B is connected to a cooling circuit A through one-way valve 6-1 near the main heat exchanger A. A normally open solenoid valve is installed in the heating circuit B. The output end of the heating circuit B is connected to a filter 5-1 through one-way valve 6-2. The filter 5-1 is externally connected to a main unit throttle valve. The input end of the cooling circuit A is connected to the filter 5-1. The output end of the filter 5-1 is connected to port 4 of the auxiliary heat exchanger. The auxiliary heat exchanger is connected to port 2 of the main heat exchanger through port 3.

[0019] In one embodiment of this utility model, one end is connected after the main circuit throttling valve of the heat pump unit and the other end is connected before the four-way valve of the refrigerant circuit of the heat pump unit.

[0020] In one embodiment of this utility model, the main heat exchanger A and the auxiliary heat exchanger B have different heat exchange capacities. The main heat exchanger A, the auxiliary heat exchanger B, the one-way valve 6-1, the normally open solenoid valve, and the one-way valve 6-2 cooperate to form two heat exchanger combinations with different heat exchange capacities.

[0021] In one embodiment of this utility model, a branch is provided on the heating circuit B, and the branch is provided with a balance tank, a liquid receiver, a flash evaporator, two filters 5-2 and a throttling valve. The branch is connected to a compressor through another output end of the flash evaporator.

[0022] In one embodiment of this utility model, the heating circuit A and the cooling circuit B contain different amounts of refrigerant.

[0023] In one embodiment of this utility model, it can be used in fluorine cycle refrigeration and heating system units such as air-cooled heat pump (chilled and hot water) units, air-cooled heat pump (heating and cooling) air conditioning units, air-cooled heat pump chillers, air-cooled heat pump hot water units, water (ground) source heat pump (chilled and hot water) units, and water (ground) source heat pump (heating and cooling) air conditioning units to improve their cooling and heating capabilities and energy efficiency.

[0024] During refrigeration operation, the normally open solenoid valve is energized and closes, working in conjunction with the one-way valve 6-1. This closes the refrigeration circuit A and the heating circuit B in the refrigerant circuit, shutting off the internal volume of the receiver, flash evaporator and its accessories, as well as the piping in these areas. This releases the refrigerant to participate in system operation. The main heat exchanger A and auxiliary heat exchanger B operate simultaneously to meet refrigeration demands. At this time, the refrigerant flow within the unit does not pass through the receiver, flash evaporator, or other piping spaces, effectively closing off a portion of the refrigerant circuit's internal volume. Simultaneously, the high-pressure receiver and flash evaporator are converted to low-pressure zones, and the refrigerant stored within them enters the unit's refrigeration cycle under pressure, increasing the actual refrigerant volume during refrigeration and improving cooling capacity and energy efficiency.

[0025] During heating operation, the normally open solenoid valve de-energizes and opens, working in conjunction with check valve 6-2. This opens the heating circuit (B) and closes the refrigeration circuit (A) in the refrigerant circuit, opening the internal volume of the receiver, flash evaporator and its accessories, as well as the corresponding piping. The main heat exchanger A operates, while the auxiliary heat exchanger B operates without refrigerant and does not exchange heat. The reactivated receiver and flash evaporator not only increase the refrigerant circuit volume significantly but also operate in a high-pressure zone, storing a large amount of refrigerant, reducing refrigerant return, and increasing the unit's heating capacity and efficiency.

[0026] By energizing (or de-energizing) the solenoid valve, it works in conjunction with check valves, three-way valves, etc., to change the direction of refrigerant flow, close or open the main and auxiliary heat exchangers, and cooperate with the unit's balance tank, liquid receiver, flash evaporator, and other components to form dedicated cooling and heating circuits, namely circuit A and circuit B. The pipe diameters of these circuits are different, resulting in different refrigerant flow velocities, which respectively meet the unit's cooling and heating requirements for different refrigerant flow velocities.

[0027] By energizing (or de-energizing) the solenoid valve, in conjunction with check valves and three-way valves, the refrigerant flow direction is reversed, and the main and auxiliary heat exchangers are closed or opened. Together with components such as the unit's balance tank, liquid receiver, and flash evaporator, these form dedicated cooling and heating circuits, namely circuit A and circuit B. The refrigerant volumes in these circuits differ, thus altering the amount of refrigerant used in cooling and heating operations to meet the different refrigerant requirements of each condition. This technology can be used in refrigerant cycle refrigeration and heating systems such as air-cooled heat pump (chilled / hot water) units, air-cooled heat pump (cooling and heating) air conditioning units, air-cooled heat pump chillers, air-cooled heat pump water heaters, water (ground) source heat pump (chilled / hot water) units, and water (ground) source heat pump (cooling and heating) air conditioning units, improving their cooling and heating capacity and energy efficiency.

[0028] See Figure 2 The device includes a main heat exchanger, an auxiliary heat exchanger, a solenoid valve, two check valves, two three-way valves, and related connecting pipelines. By opening and closing the solenoid valve and check valves, the refrigerant flow direction is reversed, effectively combining and separating the main and auxiliary water (gas)-refrigerant heat exchangers to form two distinct refrigerant flow loops, A and B, with different heat exchange capacities, flow rates, pipe diameters, and refrigerant volumes. By adjusting three parameters—heat exchanger capacity, refrigerant volume, and pipe flow rate / diameter—the device precisely meets the different requirements of the unit for heat exchange capacity, refrigerant volume, and refrigerant flow rate during both cooling and heating operations, thereby improving the cooling and heating capacity and energy efficiency of the refrigerant cycle unit.

[0029] 1. Piping: Piping A is for refrigeration only. Piping B is for heating only. When heating, the solenoid valve is de-energized and normally open, so Piping B is open and Piping A is closed; when cooling, the solenoid valve is energized and closed, so Piping A is open and Piping B is closed.

[0030] 2. Heat exchanger: When heating, refrigerant circuit B is open but circuit A is closed; at this time, only the main heat exchanger works, and the heat exchange capacity is small; when cooling, refrigerant circuit A is open but circuit B is closed; at this time, both the main and auxiliary heat exchangers work simultaneously, and the heat exchange capacity is large.

[0031] 3. Accessories: Piping, solenoid valves, check valves, and tees, etc., operate in the cooling and heating process to adjust the refrigerant circuit volume and the amount of refrigerant participating in the unit's operation, thus helping to complete the cooling and heating process.

[0032] 4. The balance tank, liquid receiver, and flash evaporator are not part of the structure of this patent, but are only involved in the operation.

[0033] 5. Water Flow: The water flow is unrelated to cooling and heating: Water flows into the main heat exchanger A from inlet a, exits the main heat exchanger through port b, passes through copper pipes, reaches port c to enter the auxiliary heat exchanger B, and finally flows out of the auxiliary heat exchanger B through port d. 6. List of Special Components: Main heat exchanger A, auxiliary heat exchanger B, check valve, three-way valve, normally open solenoid valve, piping.

[0034] This utility model discloses a variable volume heat exchanger suitable for dual-circuit cooling and heating systems, which is equipped with separate heating and cooling circuits. During cooling circuit operation, the main and auxiliary heat exchangers work simultaneously, resulting in higher heat exchange efficiency. The internal volume of the receiver, flash evaporator and its accessories, as well as related piping in the heating circuit, is closed, releasing refrigerant to participate in system operation and maximizing cooling efficiency. Furthermore, the cooling circuit contains no unnecessary electronic components, thus not affecting the cooling effect. During heating operation, the normally open solenoid valve de-energizes and opens, working in conjunction with a check valve to ensure the heating circuit is open while the cooling circuit is closed. The internal volume of the receiver, flash evaporator and its accessories, as well as related piping, is opened, allowing the refrigerant cycle unit equipped with this variable volume heat exchanger to simultaneously achieve professional heating and cooling standards.

[0035] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A variable volume heat exchanger suitable for dual-pipeline cooling and heating systems, characterized in that, The system includes a main heat exchanger A, an auxiliary heat exchanger B, a normally open solenoid valve, a check valve 6-1, a check valve 6-2, and pipes of different diameters. The main heat exchanger A is connected to a four-way valve via port 1. The main heat exchanger A is also connected to a heating circuit B via port 2. The heating circuit B is connected to a cooling circuit A via check valve 6-1 near the main heat exchanger A. The heating circuit B contains a normally open solenoid valve. The output of the heating circuit B is connected to a filter 5-1 via check valve 6-2. The filter 5-1 is connected to a main unit throttle valve. The input of the cooling circuit A is connected to the filter 5-1. The output of the filter 5-1 is connected to port 4 of the auxiliary heat exchanger. The auxiliary heat exchanger is connected to port 2 of the main heat exchanger via port 3.

2. A variable volume heat exchanger suitable for dual-pipeline cooling and heating as described in claim 1, characterized in that, One end is connected after the main throttling valve of the heat pump unit, and the other end is connected before the four-way valve of the refrigerant circuit of the heat pump unit.

3. A variable volume heat exchanger suitable for dual-pipeline cooling and heating as described in claim 1, characterized in that, The main heat exchanger A and the auxiliary heat exchanger B have different heat exchange capacities. The main heat exchanger A, the auxiliary heat exchanger B, the one-way valve 6-1, the normally open solenoid valve, and the one-way valve 6-2 cooperate to form two heat exchanger combinations with different heat exchange capacities.

4. A variable volume heat exchanger suitable for dual-pipeline cooling and heating as described in claim 1, characterized in that, The heating circuit B has a branch circuit, which includes a balance tank, a liquid receiver, a flash evaporator, two filters 5-2, and a throttle valve. The branch circuit is connected to an external compressor through another output end of the flash evaporator.

5. A variable volume heat exchanger suitable for dual-pipeline cooling and heating as described in claim 1, characterized in that, The heating circuit A and the cooling circuit B contain different amounts of refrigerant.

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