Large-match-number low-temperature air source variable frequency heat pump unit

Abstract

The utility model discloses a large-match-number low-temperature air source variable-frequency heat pump unit which comprises a fixed-frequency system and a variable-frequency system which are relatively independent and have the same structure. The fixed-frequency system comprises a fixed-frequency scroll compressor, a four-way valve, a shell-and-tube heat exchanger, a liquid storage device and an economizer which are connected in sequence; the economizer is provided with two branches, and one branch directly flows back to the fixed-frequency scroll compressor; the other loop is connected to the fin type heat exchanger, the fin type heat exchanger and the fin type heat exchanger flow back to the four-way valve, the four-way valve is connected to the gas-liquid separator, and the gas-liquid separator flows back to the fixed-frequency scroll compressor. According to the large-matching-number low-temperature air source variable-frequency heat pump unit, the heating capacity of one unit is equivalent to that of a plurality of traditional units, the field installation space, installation cost and transportation cost of the unit are reduced, meanwhile, a plurality of fixed-frequency systems and a plurality of variable-frequency systems can be arranged in one unit, and the number of the fixed-frequency systems and the variable-frequency systems can be reduced. And the number of the running compressors can be accurately adjusted according to the large load change of the tail end, and accurate temperature control is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the heat source tower in the technical field of air conditioner, specifically is a big match number low temperature air source variable frequency heat pump unit. BACKGROUND

[0002] In prior art, low temperature air source heat pump unit generally adopts scroll compressor, and the total match number of single unit is not big due to small match number of scroll compressor, when using in large area heating, several or even dozens of units are often used in combination, which increases installation cost and land area on one hand, and also increases maintenance and management cost of multiple units; there is a unit of low temperature air source heat pump using large match number screw compressor on market, but single screw compressor has large match number, and when the end load demand is low, the single screw compressor runs with heating capacity greater than end load, which makes water temperature rapidly rise, and the unit is stopped immediately after reaching temperature, which also causes frequent start and stop of compressor, and is not conducive to normal use of unit.

[0003] In addition, the heat exchange efficiency of shell and tube heat exchanger used in prior art heat pump unit is not high, and the heat exchange tube is directly discharged to the outside after one circle in the shell, and the heat exchange efficiency needs to be improved.

[0004] Therefore, in order to solve the above problems, a density detection device for freeze-proof solution of heat source tower is needed, which has reasonable structure and can effectively backwash. UTILITY MODEL CONTENT

[0005] The utility model aims at the deficiency of prior art, and provides a big match number low temperature air source variable frequency heat pump unit, and the technical scheme is as follows:

[0006] A big match number low temperature air source variable frequency heat pump unit, which comprises a fixed frequency system and a variable frequency system which are relatively independent and have the same structure; the fixed frequency system comprises a fixed frequency scroll compressor, a four-way valve, a shell and tube heat exchanger, a liquid accumulator and an economizer which are connected in sequence; the economizer is provided with two branches, one branch directly returns to the fixed frequency scroll compressor, and the other branch is connected to a fin heat exchanger; the fin heat exchanger returns to the four-way valve, the four-way valve is connected to a gas-liquid separator, and the gas-liquid separator returns to the fixed frequency scroll compressor.

[0007] The variable frequency system comprises a variable frequency scroll compressor, and the structure of the variable frequency system is the same as that of the fixed frequency system; the unit also comprises a unit water inlet pipe and a unit water outlet pipe, the unit water inlet pipe is connected to the shell and tube heat exchanger of the fixed frequency system and the shell and tube heat exchanger of the variable frequency system respectively, and the shell and tube heat exchangers in the two systems realize water outlet from the unit water outlet pipe.

[0008] Further, a filter is installed between the shell and tube heat exchanger and the liquid accumulator of the fixed frequency system and the variable frequency system.

[0009] Further, the economizer and the finned heat exchanger of the fixed frequency system and the variable frequency system are provided with a main route expansion valve and a filter.

[0010] Further, the economizer of the fixed frequency system and the variable frequency system is further provided with an auxiliary route expansion valve.

[0011] Further, the finned heat exchanger is further provided with a corresponding fan.

[0012] Further, the shell and tube heat exchanger comprises a shell, a liquid inlet pipe and a liquid outlet pipe are arranged at the left end of the shell, and a U-shaped heat exchange pipe is arranged between the liquid inlet pipe and the liquid outlet pipe; a unit water inlet pipe is arranged at the upper end of the left side of the shell, and a unit water outlet pipe is arranged at the upper end of the right side of the shell.

[0013] Further, the shell is further vertically provided with heat exchange fins uniformly arranged therein, the heat exchange pipe passes through and is fixed on the heat exchange fins, and the heat exchange fins are further provided with uniformly arranged flow holes; the water entering the unit water inlet pipe passes through the flow holes on the heat exchange fins from left to right and is discharged from the unit water outlet pipe.

[0014] Further, the middle region of the heat exchange pipe is arranged as a swing region, and the middle position of the heat exchange fin is further provided with a perforation; the left end of the shell is provided with a reciprocating mechanism, the main shaft of the reciprocating mechanism horizontally extends into the shell and passes through the perforation at the middle position of the heat exchange fin, and the main shaft is further provided with a swing plate, the swing plate is located in the swing region and between two adjacent heat exchange fins, and the swing plate swings between the two adjacent heat exchange fins under the action of the reciprocating mechanism.

[0015] Further, the middle position of the rightmost heat exchange fin in the shell is further provided with a fixing cylinder, and the right end of the main shaft of the reciprocating mechanism is correspondingly inserted into the fixing cylinder, and the main shaft can reciprocate in the fixing cylinder.

[0016] Further, the two sides of the swing plate are further provided with arc-shaped plates protruding outward.

[0017] Beneficial effects: The utility model has the following beneficial effects:

[0018] 1) The large-matching low-temperature air source variable frequency heat pump unit has the heat production equivalent to that of multiple conventional units, reduces the installation space, installation cost and transportation cost of the unit, and can realize the coordinated operation of 1 to 6 systems, accurately adjusts the number of compressors according to the large load change at the end, and realizes accurate temperature control.

[0019] 2) the vertical heat exchange sheet is installed in the shell in the device, the heat exchange pipe is connected with the heat exchange sheet by penetrating the heat exchange sheet, and overflow holes are arranged on the heat exchange sheet, so that the water body entering from the water inlet pipe of the unit needs to flow to the right side through the overflow holes on the heat exchange sheet to be discharged, and the heat exchange sheet increases the heat exchange area of the heat exchange pipe, so that the heat exchange efficiency can be effectively increased;

[0020] 3) the reciprocating mechanism is installed at the left side end of the shell in the device, the main shaft extends into the shell and penetrates the vertical heat exchange sheet, then the swing plate is installed on the main shaft and corresponds to be installed between adjacent heat exchange sheets, so that the reciprocating plate can be driven to reciprocate in the shell through the reciprocating mechanism, the water body in the shell is stirred, heat can be discharged faster, and heat exchange is faster, and the structure is very ingenious and reasonable;

[0021] 4) in order to the stability of the overall structure, the last heat exchange sheet is provided with a fixing cylinder, the main shaft of the reciprocating mechanism is inserted into the fixing cylinder in correspondence, and the reciprocating motion of the main shaft is matched, so that the structure is more stable and reasonable; and the structure shape of the reciprocating plate is additionally provided, arc-shaped blocks are arranged on both sides, the swing area is increased, the water stirring area is larger, the water stirring is faster, and the heat exchange efficiency is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a perspective view of the utility model;

[0023] Figure 2 It is a structure diagram of the shell-tube heat exchanger in the utility model;

[0024] Figure 3 It is an installation position diagram of the swing plate in the utility model;

[0025] Figure 4 It is Figure 3 A-A view in the utility model;

[0026] Figure 5 It is Figure 3 B-B view in the utility model;

[0027] Among them, the fixed frequency scroll compressor 1;Four-way valve 2;Shell-tube heat exchanger 3;Liquid accumulator 4;Economizer 5;Fin heat exchanger 6;Gas-liquid separator 7;Variable frequency scroll compressor 8;Unit water inlet pipe 9;Unit water outlet pipe 10;Filter 11;Main road expansion valve 12;Auxiliary road expansion valve 13;Fan 14;Shell 301;Liquid inlet pipe 302;Liquid outlet pipe 303;Heat exchange pipe 304;Heat exchange sheet 305;Overflow hole 306;Swing area 307;Perforation 308;Reciprocating mechanism 309;Main shaft 310;Swing plate 311;Fixing cylinder 312;Arc-shaped plate 313. PREFERRED EMBODIMENT

[0028] The utility model is further illustrated below in combination with the drawings and specific embodiments, the embodiments are implemented on the premise of the technical scheme of the utility model, and it should be understood that the embodiments are only used for illustrating the utility model and are not used for limiting the scope of the utility model.

[0029] As shown in Figure 1 A large number of low-temperature air source variable frequency heat pump unit, including relatively independent and same structure fixed frequency system and variable frequency system, fixed frequency system includes fixed frequency scroll compressor 1, four-way valve 2, shell and tube heat exchanger 3, liquid accumulator 4 and economizer 5 connected in turn, economizer 5 is provided with two branches, one branch directly flows back to fixed frequency scroll compressor 1, another branch is connected to fin heat exchanger 6, fin heat exchanger 6, fin heat exchanger 6 flows back to four-way valve 2, four-way valve 2 is connected to gas-liquid separator 7 again, gas-liquid separator 7 flows back to fixed frequency scroll compressor 1,

[0030] Variable frequency system includes variable frequency scroll compressor 8, and the structure of variable frequency system is same with fixed frequency system, still includes unit water inlet pipe 9 and unit water outlet pipe 10, unit water inlet pipe 9 is connected to shell and tube heat exchanger 3 of fixed frequency system and shell and tube heat exchanger 3 of variable frequency system respectively, and the shell and tube heat exchanger 3 in two systems is correspondingly realized outlet water from unit water outlet pipe 10.

[0031] The shell and tube heat exchanger 3 of fixed frequency system and variable frequency system is installed with filter 11 between shell and tube heat exchanger 3 and liquid accumulator 4, and the economizer 5 of fixed frequency system and variable frequency system is installed with main road expansion valve 12 and filter 11 between economizer 5 and fin heat exchanger 6.

[0032] The economizer 5 of fixed frequency system and variable frequency system is still provided with auxiliary road expansion valve 13, and the fin heat exchanger 6 is still installed with corresponding fan 14.

[0033] As shown in Figure 2 Shell and tube heat exchanger 3 includes shell body 301, the left side end of shell body 301 is installed with liquid inlet pipe 302 and liquid outlet pipe 303, and U-shaped heat exchange pipe 304 is installed between liquid inlet pipe 302 and liquid outlet pipe 303, unit water inlet pipe 9 is installed on the left side upper end of shell body 301, and unit water outlet pipe 10 is installed on the right side upper end of shell body 301,

[0034] As shown in Figure 3 And the shell body 301 is also vertically installed with uniform spacing heat exchange fins 305, the heat exchange pipe 304 is correspondingly passed through and fixed on the heat exchange fins 305, the heat exchange fins 305 are also provided with uniformly distributed overflow holes 306, and the water body entering the unit water inlet pipe 9 is discharged from the unit water outlet pipe 10 after passing through the overflow holes 306 on the heat exchange fins 305 from left to right.

[0035] As shown in Figure 4 And Figure 5As shown, the middle region of the heat exchange pipe 304 is set as a swing region 307, and the middle position of the heat exchange fin 305 is also provided with a through hole 308; the left end of the shell 301 is installed with a reciprocating mechanism 309, the main shaft 310 of the reciprocating mechanism 309 extends transversely into the shell 301, and passes through the through hole 308 at the middle position of the heat exchange fin 305, and the main shaft 310 is also installed with a swing plate 311, the swing plate 311 is located in the swing region 307, and the swing plate 311 is located between two adjacent heat exchange fins 305, and the swing plate 311 swings between the two adjacent heat exchange fins 305 under the action of the reciprocating mechanism 309.

[0036] The middle position of the rightmost heat exchange fin 305 in the shell 301 is also installed with a fixed cylinder 312, and the right end of the main shaft 310 of the reciprocating mechanism 309 is correspondingly inserted into the fixed cylinder 312, and the main shaft 310 can reciprocate in the fixed cylinder 312; the two sides of the swing plate 311 are also provided with arc-shaped plates 313 which are outwardly protruding.

[0037] The specific working principle and working principle of the device are as follows: the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port of the fixed-frequency scroll compressor in the fixed-frequency system enters the shell-and-tube heat exchanger after passing through the four-way valve, and the high-temperature and high-pressure gaseous refrigerant exchanges heat with the water entering through the water inlet of the unit in the shell-and-tube heat exchanger. After the gaseous refrigerant condenses and releases heat to the water, the water is heated and discharged from the water outlet of the unit, and the gaseous refrigerant condenses into liquid state, filters through the filter and is sent to the liquid accumulator, and then is sent to the economizer from the liquid accumulator. After coming out of the economizer, the refrigerant is divided into two ways, one of which enters the economizer again after passing through the auxiliary expansion valve, and then returns to the fixed-frequency scroll compressor after coming out of the economizer; the other way passes through the main expansion valve after coming out of the economizer, and then enters the fin heat exchanger after being filtered by the filter. Under the action of the fan, the refrigerant evaporates and absorbs heat in the heat exchanger, and after vaporization, the gaseous refrigerant passes through the four-way valve and is separated into gas and liquid by the gas-liquid separator, and then returns to the fixed-frequency scroll compressor, completing the circulation of the refrigerant.

[0038] The high-temperature and high-pressure gaseous refrigerant of the variable frequency scroll compressor in the variable frequency system enters the shell-and-tube heat exchanger after passing through the four-way valve, the refrigerant is condensed into liquid state in the heat exchanger, a large amount of heat is released to heat the water, the low-temperature and high-pressure liquid refrigerant after filtering by the filter enters the liquid accumulator, the liquid refrigerant further enters the economizer, the refrigerant after exiting the economizer is divided into two branches, one branch passes through the throttling of the auxiliary path expansion valve to become low-temperature refrigerant, and then enters the economizer again to absorb the heat of the refrigerant entering the economizer before, and then exits the economizer to return to the variable frequency scroll compressor; the other branch of the refrigerant passes through the throttling of the main path expansion valve to become low-temperature and low-pressure liquid refrigerant, and then enters the fin heat exchanger through the filter, the liquid refrigerant starts to gasify and absorb heat under the action of the fan in the heat exchanger to become gaseous refrigerant, the gaseous refrigerant is stored in the gas-liquid separator after passing through the four-way valve, and the gaseous refrigerant returns to the variable frequency scroll compressor to complete the first cycle of the refrigeration system.

[0039] The specific working principle of the shell-and-tube heat exchanger is as follows: the water entering the system passes through the U-shaped heat exchange pipe in the shell body and is discharged from the shell body, and the water inlet pipe of the unit injects water into the shell body, and the water flows from left to right and is discharged from the water outlet shell body.

[0040] In the device, vertical heat exchange fins are installed in the shell body, the heat exchange pipes pass through the heat exchange fins and are connected with the heat exchange fins, and overflow holes are provided on the heat exchange fins. Therefore, the water entering the water inlet pipe of the unit needs to flow to the right side through the overflow holes on the heat exchange fins to be discharged, and the heat exchange fins increase the heat exchange area of the heat exchange pipes, which can effectively increase the heat exchange efficiency.

[0041] In order to further increase the heat exchange efficiency, a swing plate is arranged in the shell body. Since the heat exchange pipes are arranged in a U shape, the inside has a certain area space. A reciprocating mechanism is installed at the left end of the shell body, the main shaft of the reciprocating mechanism extends into the shell body and penetrates the vertical heat exchange fins, and then the swing plate is installed on the main shaft and corresponds to the adjacent heat exchange fins. The reciprocating mechanism can drive the swing plate to reciprocate in the shell body, realize the stirring of the water in the shell body, and make the heat dissipate faster to complete heat exchange faster. The structure is very ingenious and reasonable.

[0042] In order to improve the stability of the overall structure, a fixed cylinder is installed on the last heat exchange fin, the main shaft of the reciprocating mechanism is inserted into the fixed cylinder, and the reciprocating movement of the main shaft is matched, so that the structure is more stable and reasonable. In addition, the structure shape of the swing plate is also arranged, arc-shaped blocks are arranged on both sides to increase the swing area, so that the stirring area of the water is larger and the stirring is faster, and the heat exchange efficiency is effectively improved.

[0043] The above specific embodiment is only a preferred embodiment of the present application, and is not used to limit the implementation and the scope of claims of the present application. Any equivalent changes and modifications made according to the content of the patent protection scope of the present application should be included in the patent application scope of the present application.

Claims

1. A large number of low-temperature air source variable frequency heat pump unit, characterized in that: It includes a relatively independent and structurally identical fixed-frequency system and a variable-frequency system; the fixed-frequency system includes a fixed-frequency scroll compressor (1), a four-way valve (2), a shell and tube heat exchanger (3), a liquid receiver (4), and an economizer (5) connected in sequence; the economizer (5) is provided with two branches, one branch directly returns to the fixed-frequency scroll compressor (1); the other circuit is connected to the finned heat exchanger (6), the finned heat exchanger (6) returns to the four-way valve (2), the four-way valve (2) is then connected to the gas-liquid separator (7), the gas-liquid separator (7) returns to the fixed-frequency scroll compressor (1); The variable frequency system includes a variable frequency scroll compressor (8), and the variable frequency system has the same structure as the fixed frequency system; it also includes a unit inlet pipe (9) and a unit outlet pipe (10). The unit inlet pipe (9) is connected to the shell and tube heat exchanger (3) of the fixed frequency system and the shell and tube heat exchanger (3) of the variable frequency system, respectively. The shell and tube heat exchangers (3) in the two systems respectively discharge water from the unit outlet pipe (10).

2. The large-matching-number low-temperature air source variable frequency heat pump unit according to claim 1, characterized in that: A filter (11) is installed between the shell-and-tube heat exchanger (3) and the liquid receiver (4) of both the fixed-frequency system and the variable-frequency system.

3. The large-matching-number low-temperature air source variable frequency heat pump unit according to claim 1, characterized in that: Both the fixed-frequency system and the variable-frequency system have an economizer (5) and a finned heat exchanger (6) equipped with a main expansion valve (12) and a filter (11).

4. A high-capacity low-temperature air source variable frequency heat pump unit according to claim 1, characterized in that: An auxiliary expansion valve (13) is also provided on the economizer (5) of the fixed frequency system and the variable frequency system.

5. A high-capacity low-temperature air source variable frequency heat pump unit according to claim 1, characterized in that: The finned heat exchanger (6) is also equipped with a corresponding fan (14).

6. A high-capacity low-temperature air source variable frequency heat pump unit according to claim 1, characterized in that: The shell-and-tube heat exchanger (3) includes a shell (301), an inlet pipe (302) and an outlet pipe (303) are installed on the left side of the shell (301), and a U-shaped heat exchange tube (304) is installed between the inlet pipe (302) and the outlet pipe (303); the unit inlet pipe (9) is installed on the upper left side of the shell (301), and the unit outlet pipe (10) is installed on the upper right side of the shell (301); Furthermore, the shell (301) is vertically installed with evenly spaced heat exchange plates (305), and the heat exchange tube (304) passes through the heat exchange plate (305) and is fixed on the heat exchange plate (305). The heat exchange plate (305) is also provided with evenly distributed flow holes (306). The water entering the unit water inlet pipe (9) passes through the flow holes (306) on the heat exchange plate (305) from left to right and is discharged from the unit water outlet pipe (10).

7. A high-capacity low-temperature air source variable frequency heat pump unit according to claim 6, characterized in that: The area in the middle of the heat exchange tube (304) is set as a swing area (307), and a perforation (308) is also provided at the middle position of the heat exchange plate (305); a reciprocating mechanism (309) is installed on the left side of the housing (301). The main shaft (310) of the reciprocating mechanism (309) extends laterally into the housing (301) and passes through the perforation (308) at the middle position of the heat exchange plate (305). A swing plate (311) is also installed on the main shaft (310). The swing plate (311) is located in the swing area (307) and is located between two adjacent heat exchange plates (305). Under the action of the reciprocating mechanism (309), the swing plate (311) swings between two adjacent heat exchange plates (305).

8. A high-capacity low-temperature air source variable frequency heat pump unit according to claim 7, characterized in that: A fixed cylinder (312) is installed in the middle of the rightmost heat exchange plate (305) inside the housing (301). The right end of the main shaft (310) of the reciprocating mechanism (309) is inserted into the fixed cylinder (312), and the main shaft (310) can reciprocate inside the fixed cylinder (312).

9. A high-capacity low-temperature air source variable frequency heat pump unit according to claim 7, characterized in that: The swing plate (311) is also provided with arc-shaped plates (313) that protrude outward on both sides.

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