Multifunctional efficient defrosting evaporation cold and heat pump unit

Abstract

The utility model relates to the field of cold and heat pump units, in particular to a multifunctional efficient defrosting evaporation cold and heat pump unit which comprises a compressor, and an outlet of the compressor is respectively connected with an inlet of a shell and tube heat exchanger and an inlet of an evaporation cold heat exchanger through a four-way reversing valve. An outlet of the evaporation cold heat exchanger is connected with an inlet of the compressor and an outlet of the shell-tube heat exchanger through electronic expansion valves. An outlet of the shell-tube heat exchanger is connected with an inlet of the compressor and the fin type heat exchanger set through the electronic expansion valve. The fin type heat exchanger set comprises at least two sets of heat exchange channels which are mutually independent, each heat exchange channel is formed by connecting a three-way valve, a fin type heat exchanger and a one-way valve in series, and the three-way valve is connected with an inlet and an outlet of the compressor. The utility model provides a multifunctional efficient defrosting evaporation cold and heat pump unit, which can realize three functions of efficient refrigeration, heating and continuous defrosting while heating.

Description

Technical Field

[0001] The utility model relates to the field of cold heat pump units, and particularly relates to a multifunctional and efficient defrosting evaporative cold heat pump unit. Background Technique

[0002] The refrigeration energy efficiency of air source heat pump units is low. Therefore, the building cold and heat source system often adopts a combination of a chiller system and an air source heat pump. In summer, the chiller provides cooling for the building, and in winter, the air source heat pump provides heating for the building. However, in this way, one set of system equipment is always idle, resulting in waste of resources and high initial investment in the project. In recent years, some people have gradually combined water-cooled technology with air source heat pumps to form evaporative cold heat pump units. One set of equipment can not only achieve efficient refrigeration but also efficient heating in winter. However, existing systems all have the problem of high energy consumption caused by the traditional reverse cycle defrosting method during winter operation, and the water temperature fluctuates violently. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the deficiencies in the prior art that the existing evaporative cold heat pump units use the traditional reverse cycle defrosting method during winter operation, resulting in high energy consumption and violent water temperature fluctuations, and to provide a multifunctional and efficient defrosting evaporative cold heat pump unit.

[0004] In the first aspect, the utility model provides a multifunctional and efficient defrosting evaporative cold heat pump unit, including a compressor,

[0005] The outlet of the compressor is respectively connected to the inlet of the shell-and-tube heat exchanger and the inlet of the evaporative cold heat exchanger through a four-way reversing valve; the outlet of the evaporative cold heat exchanger is respectively connected to the inlet of the compressor and the outlet of the shell-and-tube heat exchanger through an electronic expansion valve; the outlet of the shell-and-tube heat exchanger is respectively connected to the inlet of the compressor and the fin heat exchanger group through an electronic expansion valve.

[0006] The fin heat exchanger group includes at least 2 heat exchange paths, which are independent of each other. Each heat exchange path is formed by connecting a three-way valve, a fin heat exchanger and a check valve in series, and the three-way valve is connected to the inlet and outlet of the compressor.

[0007] Preferably, the unit further includes an economizer, and the economizer is connected to the electronic expansion valve and the outlet of the compressor.

[0008] Preferably, the unit further includes a drying filter, and both ends of the drying filter are respectively connected to the evaporative cold heat exchanger and the economizer, and a check valve is arranged between the drying filter and the evaporative cold heat exchanger.

[0009] Preferably, the unit further includes a liquid receiver, both ends of the liquid receiver are respectively connected to the shell-and-tube heat exchanger and the dryer filter, and a check valve is arranged between the liquid receiver and the dryer filter.

[0010] Preferably, a gas-liquid separator is further arranged at the inlet of the compressor.

[0011] Preferably, the finned heat exchanger group includes 3 - 8 heat exchange passages.

[0012] Preferably, the finned heat exchanger group includes 5 heat exchange passages.

[0013] Preferably, the finned heat exchanger is connected with a solenoid valve.

[0014] Preferably, the outlet of the evaporative condenser heat exchanger is connected to the outlet of the shell-and-tube heat exchanger through a first electronic expansion valve, the outlet of the shell-and-tube heat exchanger is connected to the finned heat exchanger group through a second electronic expansion valve, and the outlets of the evaporative condenser heat exchanger and the shell-and-tube heat exchanger are both connected to the inlet of the compressor through a third electronic expansion valve.

[0015] Preferably, the second electronic expansion valve is connected to the check valve of the heat exchange passage.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] The present utility model provides a multifunctional high-efficiency defrosting evaporative condenser heat pump unit, which can realize three functions of high-efficiency refrigeration, heating, and continuous defrosting during heating. During refrigeration, the condenser is the evaporative condenser heat exchanger, and spray water is used to cool and condense the refrigerant, and the condensation temperature is lower than that of the traditional water chiller, and the energy efficiency is higher than that of the traditional water chiller. During winter heating, the finned heat exchanger is used as the evaporator to absorb heat from the air. During defrosting, heat is absorbed from the air, and while improving the energy efficiency, heat can be continuously supplied to users without interruption. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the system schematic diagram of the multifunctional high-efficiency defrosting evaporative condenser heat pump unit described in the present utility model.

[0019] Figure 2 It is the normal refrigeration operation schematic diagram of the multifunctional high-efficiency defrosting evaporative condenser heat pump unit described in the present utility model.

[0020] Figure 3 It is the normal heating operation schematic diagram of the multifunctional high-efficiency defrosting evaporative condenser heat pump unit described in the present utility model.

[0021] Figure 4 It is the defrosting operation schematic diagram of the finned heat exchanger of the multifunctional high-efficiency defrosting evaporative condenser heat pump unit described in the present utility model.

[0022] Markings in the figure:

[0023] 1: Compressor,

[0024] 2-1: First three-way valve, 2-2: Second three-way valve, 2-3: Third three-way valve, 2-4: Fourth three-way valve, 2-5: Fifth three-way valve,

[0025] 3: Shell-and-tube heat exchanger,

[0026] 4: Evaporative condenser heat exchanger,

[0027] 5-1: First finned heat exchanger, 5-2: Second finned heat exchanger, 5-3: Third finned heat exchanger, 5-4: Fourth finned heat exchanger, 5-5: Fifth finned heat exchanger,

[0028] 6: Liquid receiver,

[0029] 7-1: First electronic expansion valve, 7-2: Second electronic expansion valve, 7-3: Third electronic expansion valve,

[0030] 8: Economizer,

[0031] 9: Drier filter,

[0032] 10: Check valve,

[0033] 11: Solenoid valve,

[0034] 12: Four-way reversing valve. Detailed implementation manners

[0035] The following further describes the present utility model in detail with reference to specific embodiments. However, it should not be understood that the scope of the above-mentioned subject matter of the present utility model is limited to the following embodiments. All technologies implemented based on the content of the present utility model belong to the scope of the present utility model.

[0036] In the description of the specific embodiments of the present utility model, without special instructions, the expression terms of the orientation or positional relationship such as "upper", "lower", "left", "right", "center", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product / equipment / device of the present utility model is commonly used and placed. These terms of orientation or positional relationship are only for the convenience of describing the solution of the present utility model or simplifying the description in the specific embodiments, facilitating technicians to quickly understand the solution, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, it should not be construed as a limitation to the present utility model.

[0037] In addition, for terms such as "horizontal", "vertical", "hanging", "parallel", etc., it does not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or hanging or parallel, but it can be slightly inclined or deviated. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and it does not mean that the structure must be completely horizontal, but it can be slightly inclined. Or, it can be simply understood that the corresponding device / component / element is arranged in directions such as "horizontal", "vertical", "hanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the solution of the present utility model.

[0038] In addition, for expressions such as "first", "second", "third", etc. that appear in the terms, they are only used to distinguish the descriptions of the same or similar components, and should not be understood as emphasizing or implying the relative importance of specific components.

[0039] In addition, in the description of the embodiments of the present utility model, "several", "multiple", "a number of" represent at least 2. It can be any situation such as 2, 3, 4, 5, 6, 7, 8, 9, etc., and even can be a situation of more than 9.

[0040] In addition, in the description of the technical solution of the present utility model, unless otherwise clearly specified / defined / limited, for places where terms such as "set", "installed", "connected", "linked", "provided with", "laid", "arranged" appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be connection means commonly used in the art such as welding, riveting, bolting, threaded connection, etc. Such a connection can be a mechanical connection, an electrical connection or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components.

[0041] Embodiment 1

[0042] As Figure 1 shown, a multifunctional and highly efficient defrosting evaporative cooling heat pump unit includes a compressor 1, a shell-and-tube heat exchanger 3, an evaporative cooling heat exchanger 4, a fin heat exchanger group, etc.

[0043] The outlet of the compressor 1 is connected to the inlet of the evaporative cooling heat exchanger 4 through a four-way reversing valve 12, the outlet of the evaporative cooling heat exchanger 4 is connected to the inlet of the compressor 1 through a third electronic expansion valve 7-3, and the outlet of the evaporative cooling heat exchanger 4 is connected to the outlet of the shell-and-tube heat exchanger 3 through a first electronic expansion valve 7-1.

[0044] The outlet of the compressor 1 is connected to the inlet of the shell-and-tube heat exchanger 3 through a four-way reversing valve 12. The outlet of the shell-and-tube heat exchanger 3 is connected to the inlet of the compressor 1 through a third electronic expansion valve 7-3. The outlet of the shell-and-tube heat exchanger 3 is connected to the check valve 10 of the fin heat exchanger bank through a second electronic expansion valve 7-2.

[0045] The fin heat exchanger bank includes at least two heat exchange paths, which are independent of each other. Each heat exchange path is formed by connecting a three-way valve, a fin heat exchanger, and a check valve 10 in series. The three-way valve is connected to the inlet and outlet of the compressor 1.

[0046] Preferably, the fin heat exchanger bank includes 3-8 heat exchange paths, and more preferably includes 5 heat exchange paths, that is, the first three-way valve 2-1, the first fin heat exchanger 5-1, and a check valve 10 are connected in series to form the first heat exchange path; the second three-way valve 2-2, the second fin heat exchanger 5-2, and a check valve 10 are connected in series to form the second heat exchange path; the third three-way valve 2-3, the third fin heat exchanger 5-3, and a check valve 10 are connected in series to form the third heat exchange path; the fourth three-way valve 2-4, the fourth fin heat exchanger 5-4, and a check valve 10 are connected in series to form the fourth heat exchange path; the fifth three-way valve 2-5, the fifth fin heat exchanger 5-5, and a check valve 10 are connected in series to form the fifth heat exchange path. More preferably, the fin heat exchanger is connected with a solenoid valve 11.

[0047] In this embodiment, a liquid receiver 6, an economizer 8, and a dryer filter 9 are further included. The economizer 8 is connected to the outlet of the compressor 1. The evaporative cooling heat exchanger 4 is connected to the economizer 8 through the dryer filter 9, and a check valve is arranged between the dryer filter 9 and the evaporative cooling heat exchanger 4. The shell-and-tube heat exchanger 3 is connected to the dryer filter 9 through the liquid receiver 6, and a check valve is arranged between the liquid receiver 6 and the dryer filter 9. The economizer 8 is further connected to the first electronic expansion valve 7-1, the second electronic expansion valve 7-2, and the third electronic expansion valve 7-3.

[0048] In some embodiments, a gas-liquid separator may also be arranged at the inlet of the compressor 1.

[0049] Embodiment 2

[0050] Based on the multifunctional high-efficiency defrosting evaporative cooling heat pump unit described in Embodiment 1, its specific operation mode is as follows:

[0051] Such as Figure 2As shown, during normal refrigeration operation, port D and port C of the system's four-way reversing valve 12 are connected, ports E and S of the three-way valves (including the first three-way valve 2-1, the second three-way valve 2-2, the third three-way valve 2-3, the fourth three-way valve 2-4, and the fifth three-way valve 2-5) are connected, the second electronic expansion valve 7-2 and the solenoid valve 11 are closed, the fans of the finned heat exchangers (including the first finned heat exchanger 5-1, the second finned heat exchanger 5-2, the third finned heat exchanger 5-3, the fourth finned heat exchanger 5-4, and the fifth finned heat exchanger 5-5) are closed, the first electronic expansion valve 7-1 and the third electronic expansion valve 7-3 are opened, and the system produces chilled water for users through the shell-and-tube heat exchanger 3. The refrigerant circulation system operates in the following manner as Figure 2 indicated by the arrow. The high-temperature and high-pressure refrigerant at the outlet of the compressor 1 enters the evaporative condenser heat exchanger 4 through the four-way reversing valve 12, condenses into high-pressure liquid refrigerant, then passes through the check valve and the dryer filter 9, and enters the economizer 8 for further cooling. A small portion of the cooled low-temperature and high-pressure liquid refrigerant passes through the third electronic expansion valve 7-3 and then absorbs heat and evaporates inside the economizer 8 and enters the gas replenishment port of the compressor 1. Another portion passes through the first electronic expansion valve 7-1 for pressure reduction, then enters the shell-and-tube heat exchanger 3 to absorb heat and evaporate, and the evaporated gaseous refrigerant finally returns to the suction port of the compressor 1 to complete the cycle.

[0052] As Figure 3 shown, during normal heating operation, port D and port E of the system's four-way reversing valve 12 are connected, ports E and S of the three-way valves (including the first three-way valve 2-1, the second three-way valve 2-2, the third three-way valve 2-3, the fourth three-way valve 2-4, and the fifth three-way valve 2-5) are connected, the first electronic expansion valve 7-1 and the solenoid valve 11 are closed, the fans of the finned heat exchangers (including the first finned heat exchanger 5-1, the second finned heat exchanger 5-2, the third finned heat exchanger 5-3, the fourth finned heat exchanger 5-4, and the fifth finned heat exchanger 5-5) are turned on, the second electronic expansion valve 7-2 and the third electronic expansion valve 7-3 are opened, and the system produces chilled water for users through the shell-and-tube heat exchanger 3. The refrigerant circulation system operates in the following manner as Figure 3As shown by the arrow, the high-temperature and high-pressure refrigerant at the outlet of the compressor 1 enters the shell-and-tube heat exchanger 3 through the four-way reversing valve 12, condenses into high-pressure liquid refrigerant, then passes through the liquid receiver 6, check valve and dryer filter 9, enters the economizer 8 for further cooling. A small part of the cooled low-temperature and high-pressure liquid refrigerant passes through the third electronic expansion valve 7-3, absorbs heat and evaporates inside the economizer 8, and then enters the gas supplement port of the compressor 1. The other part is depressurized by the second electronic expansion valve 7-2, and then enters the first finned heat exchanger 5-1, second finned heat exchanger 5-2, third finned heat exchanger 5-3, fourth finned heat exchanger 5-4, and fifth finned heat exchanger 5-5 respectively to absorb heat and evaporate. The evaporated gaseous refrigerant returns to the suction port of the compressor 1 through the first three-way valve 2-1, second three-way valve 2-2, third three-way valve 2-3, fourth three-way valve 2-4, and fifth three-way valve 2-5 respectively to complete the cycle.

[0053] As Figure 4 shown, when the first finned heat exchanger 5-1 is defrosting, the D port and E port of the system four-way reversing valve 12 are connected, the E and S ports of the second three-way valve 2-2, third three-way valve 2-3, fourth three-way valve 2-4, and fifth three-way valve 2-5 are connected, the E and D ports of the first three-way valve 2-1 are connected, the first electronic expansion valve 7-1 is closed, the fan of the first finned heat exchanger 5-1 is closed, and the fans of the second finned heat exchanger 5-2, third finned heat exchanger 5-3, fourth finned heat exchanger 5-4, and fifth finned heat exchanger 5-5 are turned on. The second electronic expansion valve 7-2, third electronic expansion valve 7-3, and solenoid valve 11 are turned on. While the system produces hot water for users through the shell-and-tube heat exchanger 3, it defrosts the first finned heat exchanger 5-1. The refrigerant circulation system circulation mode is as Figure 4 shown by the arrow. The high-temperature and high-pressure refrigerant at the outlet of the compressor 1 is divided into two paths. One path enters the shell-and-tube heat exchanger 3 through the four-way reversing valve 12, condenses into high-pressure liquid refrigerant, then passes through the liquid receiver 6, check valve and dryer filter 9, enters the economizer 8 for further cooling. A small part of the cooled low-temperature and high-pressure liquid refrigerant passes through the third electronic expansion valve 7-3, absorbs heat and evaporates inside the economizer 8, and then enters the gas supplement port of the compressor 1. The other part is depressurized by the second electronic expansion valve 7-2. The other path enters the first finned heat exchanger 5-1 through the first three-way valve 2-1 for condensation and heat release, and at the same time melts the frost layer on the fin surface. The condensed liquid refrigerant is throttled and depressurized by the solenoid valve 11, and then the two paths of refrigerant converge, and then enter the second finned heat exchanger 5-2, third finned heat exchanger 5-3, fourth finned heat exchanger 5-4, and fifth finned heat exchanger 5-5 respectively to absorb heat and evaporate. The evaporated gaseous refrigerant returns to the suction port of the compressor 1 through the three-way valves (including the first three-way valve 2-1, second three-way valve 2-2, third three-way valve 2-3, fourth three-way valve 2-4, and fifth three-way valve 2-5) respectively to complete the cycle. When the other finned heat exchangers are defrosting, it is the same as the defrosting of the first finned heat exchanger 5-1.

[0054] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A multifunctional and efficient defrosting evaporative heat pump unit, characterized in that: comprising a compressor (1), The outlet of the compressor (1) is connected to the inlet of the shell and tube heat exchanger (3) and the inlet of the evaporative heat exchanger (4) through a four-way reversing valve (12); the outlet of the evaporative heat exchanger (4) is connected to the inlet of the compressor (1) and the outlet of the shell and tube heat exchanger (3) through an electronic expansion valve; the outlet of the shell and tube heat exchanger (3) is connected to the inlet of the compressor (1) and the fin heat exchanger group through an electronic expansion valve; The fin heat exchanger group includes at least two groups of heat exchange passages, which are independent of each other. Each group of heat exchange passages is formed by a three-way valve, a fin heat exchanger and a one-way valve (10) connected in series, and the three-way valve is connected to the inlet and outlet of the compressor (1).

2. A multifunctional and efficient defrosting evaporative heat pump unit according to claim 1, characterized in that: It also includes an economizer (8), which is connected to the electronic expansion valve and the outlet of the compressor (1).

3. A multifunctional and efficient defrosting evaporative heat pump unit according to claim 2, characterized in that: It also comprises a drying filter (9), the two ends of which are respectively connected to the evaporative heat exchanger (4) and the economizer (8), and a one-way valve is provided between the drying filter (9) and the evaporative heat exchanger (4).

4. A multifunctional and efficient defrosting evaporative heat pump unit according to claim 3, characterized in that: It also comprises a liquid reservoir (6), the two ends of which are respectively connected to the shell and tube heat exchanger (3) and the drying filter (9), and a one-way valve is provided between the liquid reservoir (6) and the drying filter (9).

5. The multifunctional and efficient defrosting evaporative heat pump unit according to claim 1, characterized in that: The inlet of the compressor (1) is also provided with a gas-liquid separator.

6. A multifunctional and efficient defrosting evaporative heat pump unit according to claim 1, characterized in that: The fin heat exchanger group includes 3-8 groups of heat exchange passages.

7. A multifunctional and efficient defrosting evaporative heat pump unit according to claim 6, characterized in that: The fin heat exchanger group includes 5 groups of heat exchange passages.

8. The multifunctional and efficient defrosting evaporative heat pump unit according to claim 1, characterized in that: The fin heat exchanger is connected to a solenoid valve (11).

9. A multifunctional and efficient defrosting evaporative heat pump unit according to any one of claims 1 to 8, characterized in that: The outlet of the evaporative heat exchanger (4) is connected to the outlet of the shell and tube heat exchanger (3) via a first electronic expansion valve (7-1), the outlet of the shell and tube heat exchanger (3) is connected to the fin heat exchanger group via a second electronic expansion valve (7-2), and the outlet of the evaporative heat exchanger (4) and the outlet of the shell and tube heat exchanger (3) are both connected to the inlet of the compressor (1) via a third electronic expansion valve (7-3).

10. A multifunctional and efficient defrosting evaporative heat pump unit according to claim 9, characterized in that: The second electronic expansion valve (7-2) is connected to the one-way valve (10) of the heat exchange passage.

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