A heating regeneration frost-free heat pump integrated machine

Abstract

A heating regeneration frost-free heat pump integrated machine relates to a heat pump system. The solution inlet is connected to the solution tank, a first plate heat exchanger is provided below the first spray pipe, a shell 1 is connected to the solution outlet, and the solution outlet is connected to the precooling solution inlet; the precooling solution inlet is respectively connected to the precooling solution outlet and the preheating solution outlet, the preheating solution outlet is connected to the solution inlet, the precooling solution outlet is connected to the solution inlet, the preheating solution inlet is connected to the preheating solution outlet, and the pipelines cooperate to form a solution heat exchanger; the solution inlet is connected to the dilute solution tank, a second plate heat exchanger is provided below the second spray pipe, a shell 2 is connected to the regeneration solution tank, the regeneration solution tank is connected to the solution outlet, and the solution outlet is connected to the preheating solution inlet; a condensation waste heat module is provided between the working fluid outlet and the working fluid inlet of the second plate heat exchanger; an air source heat pump is provided between the working fluid outlet and the working fluid inlet of the first plate heat exchanger.

Description

Technical Field

[0001] The invention relates to a heat pump system, in particular to a heating regeneration frost-free heat pump integrated machine, belonging to the technical field of air source heat pump heating. Background Art

[0002] Air source heat pump is a heat pump system with wide application range and popularity in China. It uses air as a renewable cold and heat source and has the advantages of energy saving, environmental protection, high application efficiency, etc. However, when operating in winter, the temperature of the outer surface of the heat exchanger is too low, causing the water vapor in the air to condense rapidly. In the early stage of operation, the heat release due to the condensation of water vapor has a certain promoting effect on the heat exchange capacity. However, with the increase of frost layer density and thickness, the heat exchange capacity of the unit drops sharply. The frost problem of air source heat pump hinders the promotion and application of heat pumps.

[0003] There are currently two main solutions to the frosting problem of air source heat pumps: one is surface heating for defrosting, which increases the surface temperature of the heat exchanger to melt the frost layer. The reverse cycle defrosting mode of the unit is usually adopted. The unit interchanges the evaporator and the condenser, and the working fluid releases heat in the frosting area to melt the frost layer on the heat exchanger; the other is solution absorption defrosting, which uses the partial pressure difference between the concentrated solution and the water vapor in the air to absorb moisture in the air. The concentrated solution itself has a low freezing point and strong moisture absorption capacity, which can effectively prevent the formation of frost. Common forms include energy towers and solution spraying.

[0004] However, the above methods all have certain defects: the former reverse cycle defrosting has a greater impact on the operation of the unit, the indoor comfort level is significantly reduced during defrosting, and the defrosting time interval is too frequent and too slow, which has a serious impact on the unit's operating efficiency; the latter solution absorption defrosting does not need to consider the unit's operation, but it will produce a large amount of dilute solution and is restricted by the regeneration method. Therefore, it is urgent to develop a heating regeneration frost-free heat pump all-in-one that can avoid winter frost and can regenerate in real time with low energy consumption. Summary of the invention

[0005] The purpose of the present invention is to provide a heating regeneration frost-free heat pump all-in-one, which adds a refrigeration regeneration module, a solution heat exchange module, and a condensation waste heat module to the traditional air source heat pump unit, so as to ensure frost-free operation of the heat exchanger in winter, and regenerate the solution in a refrigeration cycle. The heat released by the concentration of the diluted solution in the refrigeration regeneration module is utilized to achieve higher heating efficiency and solution regeneration cycle operation.

[0006] To achieve the above object, the present invention adopts the following technical scheme: a heating regeneration frost-free heat pump integrated machine, including an air-side solution dehumidification module, a refrigeration regeneration module, a solution heat exchange module, an air source heat pump and a condensation waste heat module.

[0007] The structure of the air-side solution dehumidification module is that the solution inlet is connected to the solution tank, the bottom of the solution tank is connected to a first spray pipe, a first plate heat exchanger is provided below the first spray pipe, the first plate heat exchanger and the first spray pipe are covered with a shell 1, the bottom of the shell 1 is connected to the solution outlet, the solution outlet is connected to the precooling solution inlet, and a solution pump and a first solenoid valve are provided between the two, one end of the first plate heat exchanger is connected to the working fluid outlet and the other end is connected to the working fluid inlet;

[0008] The solution heat exchange module structure is as follows: the precooling solution inlet is connected to the precooling solution outlet and the preheating solution outlet respectively through a tee, a fifth solenoid valve is provided between the precooling solution outlet and the precooling solution inlet, the preheating solution outlet is connected to the solution inlet, and a sixth solenoid valve is provided between the preheating solution outlet and the precooling solution inlet, the precooling solution outlet is connected to the solution inlet, the preheating solution inlet is connected to the preheating solution outlet, and a one-way valve is provided between the two, and the pipeline between the one-way valve and the preheating solution inlet and the pipeline between the fifth solenoid valve and the precooling solution outlet cooperate to form a solution heat exchanger;

[0009] The structure of the refrigeration regeneration module is as follows: the solution inlet is connected to the weak solution tank, the bottom of the weak solution tank is connected to a second spray pipe, a second plate heat exchanger is provided below the second spray pipe, the second plate heat exchanger and the second spray pipe are covered with a second shell, the bottom of the second shell is connected to the regeneration solution tank, and a second solenoid valve is provided between the two, the bottom of the regeneration solution tank is connected to the solution outlet, the solution outlet is connected to the preheating solution inlet, and a fourth solenoid valve and a regeneration solution pump are provided between the two, and one end of the second plate heat exchanger is connected to the working fluid outlet and the other end is connected to the working fluid inlet;

[0010] The structure of the condensation waste heat module is as follows: a second four-way reversing valve and a second throttle valve are provided between the working fluid outlet and the working fluid inlet, a second compressor is provided between the other two ports of the second four-way reversing valve, a user-side water return port is connected to a user-side water outlet, and a water supply end pipeline of the user-side water outlet and a pipeline between the second four-way reversing valve and the second throttle valve cooperate to form a condensation waste heat heat exchanger;

[0011] The structure of the air source heat pump is as follows: a first four-way reversing valve and a first throttle valve are provided between the working fluid outlet and the working fluid inlet, a first compressor is provided between the other two ports of the first four-way reversing valve, and the pipeline between the user-side return water port and the user-side water outlet and the pipeline between the first four-way reversing valve and the first throttle valve cooperate to form a user-side heat exchanger.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. Separate the air source heat pump from the refrigeration regeneration module to form two independent units to prevent mutual interference, avoid frost on the air source heat pump, achieve continuous operation of heating regeneration, and adopt a modular structure design to facilitate users to reasonably match according to load requirements;

[0014] 2. Add a solution heat exchange module to complete the solution dehumidification, heat exchange and regeneration cycle. The solution cycle is separated from the unit working fluid cycle, avoiding the traditional double-cycle load interference. The separated solution cycle can be controlled separately and adjusted for different situations;

[0015] 3. The solution heat exchange module precools the regeneration solution, reduces the inlet temperature, improves the efficiency of the regeneration zone, and preheats the temperature of the regeneration anti-frost solution to reduce the temperature's impact on the unit's heating, promotes plate sensible heat exchange, and melts ice crystals that may exist in the solution after regeneration;

[0016] 4. The condensation waste heat module is different from the traditional condensation utilization. Its internal heat exchanger is directly connected to the user side water outlet and can be used as a condenser or evaporator. When used as a condenser, the heat exchanger provides the condensation waste heat released by the solution and the heat provided by the compressor to the user side to increase the heating water temperature. When used as an evaporator, the regeneration unit starts to melt ice and the unit runs in reverse cycle. Since the refrigeration regeneration module is independent, only part of the heat needs to be extracted from the user side during ice melting to achieve a smooth transition, avoiding the problem that the traditional composite unit takes heat from the system working fluid, affecting the unit life and the attenuation of the heating effect. While running continuously, the system efficiency is further improved and the solution demand is reduced;

[0017] 5. For the traditional solution anti-frost and freezing regeneration technology, the common fin heat exchanger and copper tube heat exchanger are changed to plate heat exchanger, which can significantly improve the operating efficiency and regeneration effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the heating regeneration frost-free heat pump integrated machine of the present invention;

[0019] Figure 2 It is a schematic diagram of the solution dehumidification, heat exchange and regeneration cycle of the present invention;

[0020] Figure 3 It is a schematic diagram of the condensation waste heat utilization cycle of the present invention;

[0021] Figure 4 It is a schematic diagram of the single heating and dehumidification cycle of the present invention. DETAILED DESCRIPTION

[0022] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] like Figure 1 to Figure 4 As shown, the present invention discloses a heating regeneration frost-free heat pump integrated machine, including an air-side solution dehumidification module 1, a refrigeration regeneration module 2, a solution heat exchange module 3, an air source heat pump 4 and a condensation waste heat module 5, the air-side solution dehumidification module 1 includes a solution inlet 11, a solution outlet 12, a working fluid inlet 13, a working fluid outlet 14, a solution tank 15, a first spray pipe 16, a first plate heat exchanger 17, an axial flow fan 18, a solution pump 19, and a first solenoid valve 110, the refrigeration regeneration module 2 includes a solution inlet 21, a solution outlet 22, a working fluid outlet 23, a working fluid inlet 24, a dilute solution tank 25, a second spray pipe 26, a second plate heat exchanger 27, a liquid replenishment tank 28, and a second Solenoid valve 29, regeneration solution tank 210, third solenoid valve 211, fourth solenoid valve 212, regeneration solution pump 213, the solution heat exchange module 3 includes a preheating solution outlet 31, a precooling solution inlet 32, a precooling solution outlet 33, a preheating solution inlet 34, a solution heat exchanger 35, a one-way valve 36, a fifth solenoid valve 37, a sixth solenoid valve 38, the air source heat pump 4 includes a first throttle valve 41, a first compressor 42, a first four-way reversing valve 43, and a user-side heat exchanger 44, the condensation waste heat module 5 includes a user-side water return port 51, a user-side water outlet 52, a condensation waste heat exchanger 53, a second four-way reversing valve 54, a second compressor 55, and a second throttle valve 56;

[0024] The solution inlet 11 is connected to the solution tank 15, and a first spray pipe 16 is connected to the bottom of the solution tank 15. A first plate heat exchanger 17 is arranged below the first spray pipe 16. The first plate heat exchanger 17 and the first spray pipe 16 are covered with a shell 1 on the outside. The bottom of the shell 1 is connected to the solution outlet 12, and an axial flow fan 18 is arranged adjacent to one side of the shell. The solution outlet 12 is connected to the precooling solution inlet 32, and a solution pump 19 and a first solenoid valve 110 are arranged between the two. The precooling solution inlet 32 ​​is connected to the precooling solution outlet 33 and the preheating solution outlet 31 respectively through a three-way connection. A fifth solenoid valve 37 is arranged between the precooling solution outlet 33 and the precooling solution inlet 32. The preheating solution outlet 31 is connected to the solution inlet 11, and a sixth solenoid valve 38 is arranged between the preheating solution outlet 31 and the precooling solution inlet 32. The precooling solution outlet 33 is connected to the solution inlet 21, and the solution inlet 21 is connected to the dilution solution outlet 33. The second plate heat exchanger 27 is provided below the second spray pipe 26, and the second plate heat exchanger 27 and the second spray pipe 26 are covered with a second shell. The bottom of the second shell is connected to the regeneration solution tank 210, and a second solenoid valve 29 is provided between the two. A liquid replenishment tank 28 is connected to one side of the regeneration solution tank 210, and a third solenoid valve 211 is provided between the two. The bottom of the regeneration solution tank 210 is connected to the solution outlet 22, and the solution outlet 22 is connected to the preheating solution inlet 34, and a fourth solenoid valve 212 and a regeneration solution pump 213 are provided between the two. The preheating solution inlet 34 is connected to the preheating solution outlet 31, and a one-way valve 36 is provided between the two. The pipeline between the one-way valve 36 and the preheating solution inlet 34 and the pipeline between the fifth solenoid valve 37 and the precooling solution outlet 33 cooperate to form a solution heat exchanger 35.

[0025] One end of the first plate heat exchanger 17 is connected to the working fluid outlet 14 and the other end is connected to the working fluid inlet 13. The working fluid outlet 14 is connected to the working fluid inlet 13, and a first four-way reversing valve 43 and a first throttle valve 41 are arranged between the two. A first compressor 42 is arranged between the other two ports of the first four-way reversing valve 43. One end of the second plate heat exchanger 27 is connected to the working fluid outlet 23 and the other end is connected to the working fluid inlet 24. The working fluid outlet 23 is connected to the working fluid inlet 24, and a second four-way reversing valve 54 and a first throttle valve 41 are arranged between the two. A second throttle valve 56, a second compressor 55 is provided between the other two ports of the second four-way reversing valve 54, the user-side return water port 51 is connected to the user-side water outlet 52, the pipeline between the user-side return water port 51 and the user-side water outlet 52 and the pipeline between the first four-way reversing valve 43 and the first throttle valve 41 cooperate to form a user-side heat exchanger 44, the water supply end pipeline of the user-side water outlet 52 and the pipeline between the second four-way reversing valve 54 and the second throttle valve 56 cooperate to form a condensation waste heat exchanger 53.

[0026] The heating regeneration frost-free heat pump integrated machine cycle mode of the present invention is as follows:

[0027] Example 1: Winter solution dehumidification, heat exchange, regeneration cycle (see attached Figure 2 )

[0028] The concentrated solution flows into the air side solution dehumidification module 1 from the solution inlet 11. At this time, the axial flow fan 18 is started, and contacts with the first plate heat exchanger 17 through the first spray pipe 16, absorbs moisture in the air to become a dilute solution to be treated, and then enters the solution heat exchange module 3 for heat exchange through the solution outlet 12, the first solenoid valve 110, and the solution pump 19. At this time, the sixth solenoid valve 38 is closed, and the dilute solution to be treated entering from the precooling solution inlet 32 ​​can only flow in one direction, and enters the solution heat exchanger 35 through the fifth solenoid valve 37. The dilute solution to be treated exchanges heat with the regenerated concentrated solution, and flows into the refrigeration regeneration module 2 from the precooling solution outlet 33 for regeneration treatment. The dilute solution to be treated entering from the solution inlet 21 contacts with the second plate heat exchanger through the second spray pipe 26. The working fluid entering from the working fluid inlet 24 provides the required cooling capacity, so that the temperature of the dilute solution to be treated drops below the freezing point of its corresponding concentration. The high-temperature working fluid flows out from the working fluid outlet 23. The dilute solution to be treated becomes a regenerated concentrated solution after removing excess water. It passes through the second solenoid valve 29, the regeneration solution tank 210, the fourth solenoid valve 212, and the regeneration solution pump 213 and enters the solution heat exchange module 3 from the preheating solution inlet 34 again to exchange heat with the dilute solution to be treated. After heat exchange, the regenerated concentrated solution passes through the preheating solution inlet 34, the solution heat exchanger 35, the one-way valve 36, and the preheating solution outlet 31. The regenerated concentrated solution flows back to the air side solution dehumidification module 1 from the solution inlet 11 again after heat exchange, completing the solution dehumidification, heat exchange, and regeneration cycle.

[0029] Example 2: Condensation waste heat utilization cycle (see attached Figure 3 )

[0030] After absorbing the condensed amount of the diluted solution to be treated, the high-temperature working medium flows out from the working medium outlet 23, enters the second compressor 55 through the second four-way reversing valve 54, and the second compressor 55 performs work to further increase the working medium heat. After the high-temperature working medium flows out of the second compressor 55, it enters the condensation waste heat exchanger 53, and then passes through the second throttle valve 56 to form a low-temperature working medium and enters the refrigeration regeneration module 2 from the working medium inlet 24 to complete the cycle. The user-end return water enters the user-side heat exchanger 44 from the user-side return water outlet 51, and then enters the condensation waste heat exchanger 53 through the user-side water outlet 52 to exchange heat with the high-temperature working medium. The high-temperature working medium releases heat in the condensation waste heat exchanger 53 to increase the user-side water outlet temperature.

[0031] Example 3: Winter heating and dehumidification cycle (see attached Figure 4 )

[0032] The concentrated solution flows into the air side solution dehumidification module 1 from the solution inlet 11. At this time, the axial flow fan 18 is started, and contacts the first plate heat exchanger 17 through the first spray pipe 16, absorbs moisture in the air to become a diluted solution. However, due to the small reduction in concentration, it still has dehumidification capacity. The diluted solution enters the solution heat exchange module 3 from the pre-cooling solution inlet 32 ​​through the solution outlet 12, the first solenoid valve 110, and the solution pump 19. At this time, the fifth solenoid valve 37 is closed, the sixth solenoid valve 38 is opened, and the one-way valve 36 prevents the solution from flowing back. The diluted solution can only flow back to the air side solution dehumidification module 1 in one direction.

[0033] The above-mentioned single heating and dehumidification cycle is suitable for the situation of low air humidity in winter or regenerative defrosting. The main difference of the closed evaporative refrigeration unit in summer is that the dehumidification solution is replaced from sodium formate to water, and the first four-way reversing valve 43 is adjusted. The air side solution dehumidification module originally used as an evaporator becomes an evaporative heat exchanger in summer and is used as a system condenser. The high-temperature and high-pressure working fluid flows through the plate heat exchanger 17, condenses and releases heat to the outdoor air. After passing through the first throttle valve 41, the working fluid further forms a low-temperature and low-pressure liquid and enters the heat exchanger 44 as an evaporator to absorb heat from the return water on the user side.

[0034] The concentrated solution enters the air source unit, and after being sprayed and heat exchanged to absorb water vapor for dilution, it enters the solution heat exchange module from the pre-cooling solution inlet to exchange heat with the regenerated concentrated solution. After being sprayed and heat exchanged in the refrigeration regeneration module of the refrigeration regeneration unit, it enters the solution heat exchange module again from the preheating solution inlet to exchange heat with the high-temperature dilute solution to be treated, and returns to the air source unit.

[0035] When the condensing waste heat exchanger 53 is used as the condenser of the regeneration system in winter, the working fluid absorbs the condensation heat released from the concentrated solution and the waste heat of the second compressor 55 to form a high-temperature and high-pressure gaseous working fluid. In the condensing waste heat exchanger 53, it exchanges heat with the relatively low-temperature user-side return water, releases heat to reduce the working fluid temperature, and then increases the user-side return water temperature, so as to fully utilize the condensation waste heat and the compressor waste heat; when used as the evaporator of the regeneration system in winter, the system is in the defrost mode. Due to the countercurrent of the working fluid, the low-temperature and low-pressure liquid working fluid first flows through the condensing waste heat exchanger 53, exchanges heat with the relatively high-temperature user-side return water, absorbs heat from the user-side return water, increases the temperature of the working fluid itself, and further forms a high-temperature and high-pressure gaseous working fluid through the second compressor 55, and releases heat to defrost in the refrigeration regeneration module 2. Advantages of condensing waste heat heat exchanger: 1. The waste heat of condensation and compressor is fully utilized. Since it is directly released to the user side, the effect is obvious, which is beneficial to the overall operation of the system; 2. In the ice melting mode, although a certain amount of heat is taken from the return water on the user side, the required heat is not large, and it will not have a large fluctuation on the user side, and a smooth transition can be achieved. The regeneration solution uses sodium formate solution, and a certain amount of sodium silicate is added for corrosion prevention, to maintain the long-term operation of the system and increase the life of the system. In addition, in summer, the heating regeneration frost-free heat pump integrated machine can be used as a refrigeration unit.

[0036] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other forms of assembly without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0037] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A heating regeneration frost-free heat pump integrated machine, characterized in that: It comprises an air-side solution dehumidification module (1), a refrigeration regeneration module (2), a solution heat exchange module (3), an air source heat pump (4) and a condensation waste heat module (5). The structure of the air-side solution dehumidification module (1) is as follows: the solution inlet (11) is connected to the solution tank (15); the bottom of the solution tank (15) is connected to a first spray pipe (16); a first plate heat exchanger (17) is provided below the first spray pipe (16); the first plate heat exchanger (17) and the first spray pipe (16) are covered with a shell (1); the bottom of the shell (1) is connected to the solution outlet (12); the solution outlet (12) is connected to the precooling solution inlet (32); a solution pump (19) and a first solenoid valve (110) are provided between the two; one end of the first plate heat exchanger (17) is connected to the working fluid outlet (14); and the other end is connected to the working fluid inlet (13); The solution heat exchange module (3) has the following structure: the precooling solution inlet (32) is connected to the precooling solution outlet (33) and the preheating solution outlet (31) respectively through a tee, a fifth solenoid valve (37) is provided between the precooling solution outlet (33) and the precooling solution inlet (32), the preheating solution outlet (31) is connected to the solution inlet (11), and a sixth solenoid valve (38) is provided between the preheating solution outlet (31) and the precooling solution inlet (32), the precooling solution outlet (33) is connected to the solution inlet (21), the preheating solution inlet (34) is connected to the preheating solution outlet (31), and a one-way valve (36) is provided between the two, and the pipeline between the one-way valve (36) and the preheating solution inlet (34) and the pipeline between the fifth solenoid valve (37) and the precooling solution outlet (33) cooperate to form a solution heat exchanger (35); The structure of the refrigeration regeneration module (2) is as follows: the solution inlet (21) is connected to a dilute solution tank (25); a second spray pipe (26) is connected to the bottom of the dilute solution tank (25); a second plate heat exchanger (27) is provided below the second spray pipe (26); a second shell is provided outside the second plate heat exchanger (27) and the second spray pipe (26); the bottom of the second shell is connected to a regeneration solution tank (210), and a second solenoid valve (29) is provided between the two; the bottom of the regeneration solution tank (210) is connected to a solution outlet (22); the solution outlet (22) is connected to a preheating solution inlet (34), and a fourth solenoid valve (212) and a regeneration solution pump (213) are provided between the two; one end of the second plate heat exchanger (27) is connected to the working fluid outlet (23) and the other end is connected to the working fluid inlet (24); The condensation waste heat module (5) has a structure in which a second four-way reversing valve (54) and a second throttle valve (56) are provided between the working fluid outlet (23) and the working fluid inlet (24); a second compressor (55) is provided between the other two ports of the second four-way reversing valve (54); a user-side water return port (51) is connected to a user-side water outlet (52); a water supply end pipeline of the user-side water outlet (52) and a pipeline between the second four-way reversing valve (54) and the second throttle valve (56) cooperate to form a condensation waste heat exchanger (53); The structure of the air source heat pump (4) is as follows: a first four-way reversing valve (43) and a first throttle valve (41) are provided between the working medium outlet (14) and the working medium inlet (13); a first compressor (42) is provided between the other two ports of the first four-way reversing valve (43); a pipeline between a user-side water return port (51) and a user-side water outlet (52) and a pipeline between the first four-way reversing valve (43) and the first throttle valve (41) cooperate to form a user-side heat exchanger (44).

2. The heating regeneration frost-free heat pump integrated machine according to claim 1, characterized in that: An axial flow fan (18) is disposed adjacent to one side of the housing.

3. The heating regeneration frost-free heat pump integrated machine according to claim 1, characterized in that: The regeneration solution tank (210) is connected to a liquid replenishment tank (28) on one side, and a third solenoid valve (211) is provided between the two.

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