Variable air duct evaporation cold and heat pump unit

Abstract

The utility model relates to the technical field of air conditioning equipment, in particular to a variable air duct evaporation cold and heat pump unit. According to the technical scheme, a finned heat exchanger and an evaporative condenser share a draught fan, a static pressure box is arranged on the air suction side of the draught fan, refrigeration and heating of the evaporative cold and heat pump unit are achieved through switching of a four-way valve, the evaporative condenser bears main condensation loads for refrigeration, and the evaporative condenser bears main condensation loads for heating. A refrigerant is pre-cooled through the fin type heat exchanger and then condensed in the evaporative condenser, a fan part is started, and inlet air enters the evaporative condenser from the fin type heat exchanger and then enters the static pressure box air inlet fan to be exhausted; heating depends on evaporation and heat absorption of the fin type heat exchanger, a shutter air opening in the lower portion of the plenum chamber is opened, inlet air in the upper portion of the fin type heat exchanger enters the plenum chamber from shutters, inlet air in the lower portion enters the plenum chamber from the evaporative condenser side and then enters the draught fan together, and the operation efficiency of the draught fan is high. The fan is high in operation efficiency and uniform in air distribution, and high energy efficiency can be achieved for both refrigeration and heating.

Description

TECHNICAL FIELD

[0001] The utility model relates to air conditioning equipment technical field especially relates to a variable air passage evaporative cooling heat pump unit. BACKGROUND

[0002] For the cold and warm demand of different regions, the air source heat pump unit is more widely used at present, and the refrigeration and heating energy efficiency is relatively high, but with the further improvement of energy saving and emission reduction requirements, the refrigeration energy efficiency is gradually outdated, and the difference is more in water cooling or evaporative cooling. As the highest heat exchange efficiency of the three in theory, the evaporative cooling heat pump unit coupled with the fin heat exchanger attracts widespread attention.

[0003] The existing evaporative cooling heat pump unit can be divided into two categories from the structure, one is that the evaporative condenser and the fin heat exchanger are relatively independent, the structure is simply spliced, and the two are respectively provided with fans without interference, the unit of this form can better play the performance of the two types of heat exchangers, but the land occupation area is large, and the cost is increased; the other is that the evaporative condenser and the fin heat exchanger share the fan, the unit structure is compact, and the large fan on the evaporative condenser side is equivalent to being saved, a plurality of small fans are combined to reasonably load and unload to meet the air volume under different working conditions, especially the air volume matching problem under different working conditions of the evaporative condenser side during refrigeration is expanded, but the air volume distribution is difficult to meet the respective needs of the two types of heat exchangers.

[0004] The above two categories are mainly due to the great difference between the structure form and the heat exchange efficiency of the fin type heat exchanger and the evaporative condenser, so that the air volume required by the unit under different working conditions is different, and the air volume required by the fin type heat exchanger during heating is much larger than that required by the evaporative spray cooling type condenser during refrigeration, therefore, if the evaporative condenser and the fin heat exchanger share the fan and the air passage is single, one form of the air passage is divided into two paths (referring to Figure 1 ), part of the air volume passes through the fin heat exchanger and returns to the fan directly, and part of the air volume passes through the fin heat exchanger and then passes through the evaporative condenser and returns to the fan. In this form, part of the air volume does not pass through the evaporative condenser during refrigeration, which leads to poor refrigeration effect or more open fans, more air volume is wasted, and energy consumption is increased; during heating, the air resistance of the two paths is different, it is difficult to balance the two parts of the air volume, which leads to uneven air speed on the fin heat exchanger, and affects the heating effect. Another form is that the air passage is a single flow path (referring to Figure 2 ), the air inlet sequence of refrigeration and heating is fin heat exchanger-evaporative condenser-fan, the air resistance of this form is large, the fan needs to bear higher load, and the evaporative condenser inlet is usually at the bottom (the common air passage space restricts the use of counter-flow evaporative condenser, and the structure is more compact), which leads to small air volume at the upper part of the fin heat exchanger, uneven heat exchange, and affects the heating performance of the unit.

[0005] Therefore, we propose a variable air passage evaporative cooling heat pump unit to solve the existing problems. The utility model discloses a kind of variable air duct evaporative cold heat pump units.

[0006] The utility model discloses a kind of variable air duct evaporative cold heat pump units.

[0007] To achieve the above object, the utility model provides the following technical scheme: a kind of variable air duct evaporative cold heat pump units, including compressor, evaporative condenser, finned heat exchanger, electric valve, solenoid valve and electronic expansion valve, the finned heat exchanger and evaporative condenser share fan, fan below is provided static pressure tank, static pressure tank bottom is connected with the air duct of fin side adjustable single-layer louver type air intake to jointly control the air volume of finned heat exchanger and evaporative condenser two flow paths air resistance, the compressor is connected with shell-and-tube heat exchanger, finned heat exchanger and evaporative condenser by four-way valve for by switching refrigerant flow direction realizes the operation of refrigeration mode or heating mode, the electronic expansion valve and solenoid valve are used for controlling refrigerant flow state respectively, first check valve, second check valve, third check valve and fourth check valve are respectively installed in refrigerant pipeline, for preventing refrigerant backflow.

[0008] Preferably, the evaporative condenser is composed of heat exchange coil, air inlet grille, spray pipeline, spray water pump and water tank, the inlet of the evaporative condenser is connected with the outlet of the finned heat exchanger, and the outlet of the evaporative condenser is connected with the inlet of the water tank, for spraying cooling water on the heat exchange surface of the evaporative condenser.

[0009] Preferably, the finned heat exchanger has three interfaces, one of which is connected with the four-way valve, and the other two interfaces are connected in parallel with the inlet of the evaporative condenser and the heating shunt head respectively.

[0010] Preferably, a drying filter is arranged in the refrigerant pipeline between the compressor and the electronic expansion valve, for adsorbing moisture and impurities in the refrigerant.

[0011] Preferably, a gas-liquid separator is arranged before the suction port of the compressor, for separating gaseous and liquid refrigerants, to prevent liquid refrigerant from entering the compressor.

[0012] Preferably, the electric valve is arranged on the branch of the refrigerant circulation pipeline, for realizing switching control of multiple circulation loops, and guiding the refrigerant flow direction to the corresponding heat exchanger in the refrigeration mode and the heating mode.

[0013] Preferably, the opening and closing angle of the single-layer louver type air intake can be dynamically adjusted, to adjust the air flow entering the static pressure tank according to the change of external environmental conditions, so as to optimize the air flow distribution in the static pressure tank and reduce the air volume loss, and an air flow guide plate is arranged in the static pressure tank, for guiding the air entering the static pressure tank to form uniform flow on the surface of the finned heat exchanger and the evaporative condenser, so as to improve the heat exchange efficiency.

[0014] Preferably, a water level sensor is arranged in the water tank to monitor the water level of the cooling water, and the operation state of the spray water pump is adjusted by a control system to ensure that the water amount in the water tank is within a reasonable range.

[0015] Compared with the prior art, the utility model has the advantages that:

[0016] During refrigeration, the fin heat exchanger and the evaporative condenser are connected in series, and the refrigerant is pre-cooled by the fin heat exchanger before entering the evaporative condenser for condensation, which is conducive to improving the refrigeration energy efficiency, reducing the area of the evaporative condenser, and saving costs.

[0017] During heating, the refrigerant enters the fins from the distribution head, and the distribution is more uniform, which is conducive to the heating capacity and energy efficiency, and the flow path does not pass through the evaporative condenser, reducing the system resistance.

[0018] During defrosting, the refrigerant from the fin heat exchanger to the interface branch of the evaporative condenser directly enters the liquid accumulator without passing through the distribution head, which is conducive to reducing the pipeline resistance and faster and more energy-saving defrosting.

[0019] The fin heat exchanger and the evaporative condenser share the fan, the structure is compact, and the occupied area and configuration cost can be effectively reduced.

[0020] A static pressure tank is arranged below the fan, the air speed is reduced after passing through the static pressure tank, and the air inlet is more uniform, reducing the formation of dead angles, which is conducive to reducing the dynamic pressure of the air system, increasing the static pressure, stabilizing the airflow, and reducing airflow vibration, improving the water carrying problem, and improving the operating efficiency of the fan. At the same time, the static pressure tank can effectively reduce noise, and further noise reduction can be achieved by arranging an acoustic and shock-absorbing layer on the wall surface of the static pressure tank.

[0021] An adjustable single-layer louvered air inlet is arranged at the bottom of the static pressure tank, which can effectively adjust the air volume on the fin heat exchanger side and the evaporative condenser side by cooperating with multiple fans for loading and unloading, and the louvered window can also prevent dust from entering the unit. During refrigeration, the louvered air inlet can be closed to make the air pass through the evaporative condenser side completely, and at this time, the number of fans opened is reduced to save energy consumption. During heating, the louvered air inlet is opened to improve the heat exchange performance of the upper part of the fin heat exchanger, improve the heat exchange efficiency of the fin heat exchanger, and improve the heating capacity and energy efficiency.

[0022] A plurality of small fans are combined, and flexible control is achieved through multiple fan loading and unloading + static pressure tank + adjustable single-layer louvered air inlet to meet the air volume under different working conditions, and the heat load borne by the fin heat exchanger and the evaporative condenser can be distributed by reasonably distributing the air volume borne by the two, which is conducive to expanding the operating range under different working conditions, such as adjusting the fin evaporative heat exchange capacity in high humidity areas to make up for the capacity decay of the evaporative condenser. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1The utility model discloses a common air system heating air duct schematic view.

[0024] Figure 2 The utility model discloses a common air system refrigeration air duct schematic view.

[0025] Figure 3 The utility model discloses a system flow chart.

[0026] Figures:

[0027] 1, compressor, 2, four-way valve, 3, fan, 4, evaporative condenser, 5, fin heat exchanger, 6, electric valve, 7, solenoid valve, 8, spray water pump, 9, water tank, 10, dry filter, 11, electronic expansion valve, 12, tube and shell heat exchanger, 13, gas-liquid separator, 14, first check valve, 15, second check valve, 16, third check valve, 17, fourth check valve, 18, static pressure tank, 19, single louvered air intake, 20, spray pipeline, 21, heat exchange coil, 22, air inlet grille. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0029] Embodiment one

[0030] As Figures 1-3 shown, the utility model discloses a variable air duct evaporative cooling heat pump unit, including compressor 1, evaporative condenser 4, fin heat exchanger 5, electric valve 6, solenoid valve 7 and electronic expansion valve 11, fin heat exchanger 5 and evaporative condenser 4 share fan 3, and the static pressure tank 18 below fan 3 is provided, and the bottom of static pressure tank 18 is connected with the air duct of fin side and is provided with adjustable single louvered air intake 19 to control the air volume and air resistance of two flow paths of fin heat exchanger 5 and evaporative condenser 4, and compressor 1 is connected with tube and shell heat exchanger 12, fin heat exchanger 5 and evaporative condenser 4 through four-way valve 2 to realize the operation of refrigeration mode or heating mode by switching the flow direction of refrigerant, and electronic expansion valve 11 and solenoid valve 7 are used to control the flow state of refrigerant respectively, and first check valve 14, second check valve 15, third check valve 16 and fourth check valve 17 are installed in the refrigerant pipeline respectively to prevent the reverse flow of refrigerant.

[0031] In the heating condition, open and adjust single louvered air intake 19 and the air inlet grille 22 of evaporative condenser 4, so that the air volume of fin heat exchanger 5 is uniform and sufficient, and the heating capacity and energy efficiency are improved.

[0032] In the refrigeration working condition, the air volume of the evaporative condenser 4 is mainly ensured, the single-layer louvered air inlet 19 is closed in normal operation, and if it is necessary to increase the fin pre-cooling capacity according to the outdoor working condition, the single-layer louvered air inlet 19 can be appropriately opened.

[0033] The evaporative condenser 4 is composed of a heat exchange coil 21, an air inlet grille 22, a spraying pipeline 20, a spraying water pump 8 and a water tank 9, the inlet of the evaporative condenser 4 is connected with the outlet of the fin heat exchanger 5, the outlet of the evaporative condenser 4 is connected with the inlet of the water tank 9, and the water tank 9 is used for spraying cooling water on the heat exchange surface of the evaporative condenser 4.

[0034] The fin heat exchanger 5 has three interfaces, one of which is connected with the four-way valve 2, and the other two interfaces are connected with the inlet of the evaporative condenser 4 and the heating shunt head in parallel, respectively, a drying filter 10 is arranged in the refrigerant pipeline between the compressor 1 and the electronic expansion valve 11, and is used for adsorbing water and impurities in the refrigerant, a gas-liquid separator 13 is arranged before the suction port of the compressor 1, and is used for separating gaseous and liquid refrigerants to prevent liquid refrigerant from entering the compressor 1, the electric valve 6 is arranged on the branch of the refrigerant circulating pipeline, and is used for realizing switching control of multiple circulating loops, guiding the refrigerant to flow to the corresponding heat exchanger in the refrigeration mode and the heating mode, a water level sensor is arranged in the water tank 9, and is used for monitoring the water level height of the cooling water, and the running state of the spraying water pump 8 is adjusted through the control system to ensure that the water amount in the water tank 9 is in a reasonable range.

[0035] Example two

[0036] As shown in Figures 1-3 Compared with example one, the refrigeration cycle path of the variable air duct evaporative cooling and heating pump unit is:

[0037] The refrigerant discharged by the compressor 1 flows through:

[0038] Compressor 1→four-way valve 2→fin heat exchanger 5→electric valve 6 (electric valve 6 is opened, and electromagnetic valve 7 is closed)→evaporative condenser 4→fourth one-way valve 17→water tank 9→drying filter 10→electronic expansion valve 11→first one-way valve 14→tube shell heat exchanger 12→four-way valve 2→gas-liquid separator 13→compressor 1, the single-layer louvered air inlet 19 is closed in the conventional working condition, if the outdoor humidity is large, the condensing load of the evaporative condenser 4 is too high, the single-layer louvered air inlet 19 can be appropriately opened, the air volume of the fin heat exchanger 5 is increased, and the pre-cooling load borne by the fin heat exchanger 5 is increased;

[0039] The heating cycle path is:

[0040] The refrigerant discharged by the compressor 1 flows through:

[0041] Compressor 1→four-way valve 2→tubular heat exchanger 12→third one-way valve 16→water tank 9→dry filter 10→electronic expansion valve 11→second one-way valve 15→fin heat exchanger 5→four-way valve 2→gas-liquid separator 13→compressor 1, open and adjust the single-layer louvered air inlet 19, so that the air volume of the fin heat exchanger 5 is uniform, and the heating capacity and efficiency are ensured.

[0042] Defrosting cycle path:

[0043] The refrigerant discharged by the compressor 1 flows through in turn:

[0044] Compressor 1→four-way valve 2→fin heat exchanger 5→solenoid valve 7 (open electric valve 7, close solenoid valve 6, not pass through evaporative condenser 4 and fin side heating shunt head)→water tank 9→dry filter 10→electronic expansion valve 11→first one-way valve 14→tubular heat exchanger 12→four-way valve 2→gas-liquid separator 13→compressor 1, close the fan 3.

[0045] It should be noted that the structures of the above-mentioned various elements are mature technologies, and their working principles and internal structures are known to those skilled in the art. The present application only utilizes the functions without improving the internal structure, so detailed description is not given here, and those skilled in the art can make any selection and arrangement according to their needs or convenience.

[0046] The above-mentioned specific embodiments are only several preferred embodiments of the present application. Based on the technical solutions of the present application and the related inspiration of the above-mentioned embodiments, those skilled in the art can make various alternative improvements and combinations on the above-mentioned specific embodiments.

[0047] It is obvious for those skilled in the art that the present application is not limited to the details of the above-mentioned exemplary embodiments, and can be realized in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above-mentioned description, so as to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present application. Any reference signs in the claims should not be regarded as limiting the involved claims.

Claims

1. A variable air volume evaporative cooling and heating pump unit comprising a compressor (1), an evaporative condenser (4), a fin heat exchanger (5), an electric valve (6), a solenoid valve (7) and an electronic expansion valve (11), characterized in that: The finned heat exchanger (5) and the evaporative condenser (4) share a fan (3), a static pressure tank (18) is arranged below the fan (3), an adjustable single-layer louvered air suction port (19) is arranged at the bottom of the static pressure tank (18) and connected with the air duct of the fin side, so as to jointly control the air volume and air resistance of the two flow paths of the finned heat exchanger (5) and the evaporative condenser (4), the compressor (1) is connected with the tube-shell heat exchanger (12), the finned heat exchanger (5) and the evaporative condenser (4) through a four-way valve (2), and is used for realizing the operation in the refrigeration mode or the heating mode by switching the refrigerant flow direction, the electronic expansion valve (11) and the electromagnetic valve (7) are respectively used for controlling the refrigerant flow state, and the first one-way valve (14), the second one-way valve (15), the third one-way valve (16) and the fourth one-way valve (17) are respectively arranged in the refrigerant pipeline, so as to prevent the reverse flow of the refrigerant.

2. The variable air duct evaporative cooling and heating pump unit according to claim 1, characterized in that: The evaporative condenser (4) is composed of a heat exchange coil (21), an air inlet grille (22), a spraying pipeline (20), a spraying water pump (8) and a water tank (9), the inlet of the evaporative condenser (4) is connected with the outlet of the finned heat exchanger (5), the outlet of the evaporative condenser (4) is connected with the inlet of the water tank (9), and the cooling water is sprayed on the heat exchange surface of the evaporative condenser (4).

3. A variable air volume evaporative chiller unit as set forth in claim 2, wherein: The finned heat exchanger (5) has three interfaces, one of which is connected with the four-way valve (2), and the other two interfaces are respectively connected with the inlet of the evaporative condenser (4) and the heating shunt head in parallel.

4. The variable airway evaporative chiller pump unit of claim 1, wherein: A drying filter (10) is arranged in the refrigerant pipeline between the compressor (1) and the electronic expansion valve (11), so as to adsorb the moisture and impurities in the refrigerant.

5. The variable airway evaporative chiller pump unit of claim 1, wherein: An air-liquid separator (13) is arranged in front of the suction port of the compressor (1), so as to separate the gaseous and liquid refrigerants and prevent the liquid refrigerant from entering the compressor (1).

6. A variable air volume evaporative chiller unit as set forth in claim 1, further comprising: The electric valve (6) is arranged on the branch of the refrigerant circulation pipeline, so as to realize the switching control of the multiple circulation loops and guide the refrigerant flow direction to the corresponding heat exchanger in the refrigeration mode and the heating mode.

7. A variable air volume evaporative chiller unit as set forth in claim 1, wherein: The opening and closing angle of the single-layer louvered air suction port (19) can be dynamically adjusted, so as to adjust the air flow entering the static pressure tank (18) according to the change of the external environment working condition, thereby optimizing the air flow distribution in the static pressure tank (18) and reducing the air volume loss, an air flow guide plate is arranged in the static pressure tank (18), the air flow guide plate is used for guiding the air entering the static pressure tank (18) to form uniform flow on the surface of the finned heat exchanger (5) and the evaporative condenser (4), thereby improving the heat exchange efficiency.

8. A variable air volume evaporative chiller unit as set forth in claim 2, wherein: A water level sensor is arranged in the water tank (9), so as to monitor the water level height of the cooling water, and the running state of the spraying water pump (8) is adjusted through the control system, so as to ensure that the water amount in the water tank (9) is in a reasonable range.

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