A heat pump system for simultaneously heating and defrosting

Abstract

The application is a heat pump system for heating and defrosting simultaneously, comprising a gas-liquid separator and a compressor, a heating main path and a defrosting branch path are connected in parallel at the outlet of the compressor, one end of the heating main path and the defrosting branch path is connected with a first-stage distribution head, the first-stage distribution head is connected with N second-stage distribution heads, each second-stage distribution head is connected with an outdoor heat exchanger, and the outlet of each outdoor heat exchanger is connected with the gas-liquid separator; a temperature sensor is used in the system to detect the real-time temperature of the outdoor heat exchanger at any time and feed back to the system, and the defrosting mode and the heating mode of each outdoor heat exchanger are overall controlled and distributed. The eccentric shell in the heating chamber is automatically controlled in the rotating position by the electromagnetic coil and the stepping driving device of the first-stage distribution head, the flow direction of the heating working medium and the defrosting working medium is quickly switched, and the defrosting and the heating mode of each outdoor heat exchanger are alternately operated efficiently.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat supply engineering, in particular to a heat pump system for heating and defrosting simultaneously. BACKGROUND

[0002] When the heat pump continuously operates in the low ambient temperature condition, the outdoor heat exchanger is inevitably frosted and causes the heating capacity to decrease, and the outdoor heat exchanger needs to be defrosted. The existing outdoor heat exchanger defrosting technology mostly uses a four-way reversing valve to switch the flow direction of the working medium, and relies on the heat generated by the compressor to defrost the outdoor heat exchanger. The defrosting time is relatively long, and the indoor heating stops during defrosting, and the operation control is unstable, and even causes the indoor to blow cold air. Especially in areas with low temperature and high humidity, the defrosting frequency is high, the time is long, the user's heating experience is poor, and the operation energy consumption is high.

[0003] Therefore, in order to improve the heating experience of the end user and improve the energy efficiency of the heat pump, a heat pump system for heating and defrosting simultaneously is provided. SUMMARY

[0004] The purpose of the present application is to provide a heat pump system for heating and defrosting simultaneously to solve the problems raised in the background art, which has the advantages of automatic control and overall regulation and control of the defrosting mode and heating mode of each outdoor heat exchanger.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a heat pump system for heating and defrosting simultaneously, comprising a gas-liquid separator and a compressor, a heating main circuit and a defrosting branch circuit are connected in parallel at the outlet of the compressor, one end of the heating main circuit and the defrosting branch circuit is connected with a first liquid distribution head, the first liquid distribution head is connected with N second liquid distribution heads, each second liquid distribution head is connected with an outdoor heat exchanger, and the outlet of each outdoor heat exchanger is connected with the gas-liquid separator in communication;

[0006] The first liquid distribution head comprises a top cover and a bottom plate, the top cover is fixedly covered on the bottom plate, a center hole is arranged in the center of the bottom plate, a bottom plate head is arranged directly below the center of the bottom plate, an actuator is arranged in the bottom plate head, an electromagnetic coil and a stepping drive device are arranged outside the bottom plate head, the electromagnetic coil and the stepping drive device control the actuator to start and stop through an electric pulse signal, a heating chamber is formed between the top cover and the bottom plate, a liquid distribution device is arranged in the heating chamber, the liquid distribution device comprises an eccentric shell with an open bottom, an eccentric rotating shaft is arranged on the inner side of the eccentric shell, the eccentric rotating shaft is connected with the actuator through the center hole, a defrosting liquid inlet and a plurality of circulation outlets are further arranged on the bottom plate, the defrosting liquid inlet is always within the range of the large end of the eccentric shell, and all the circulation outlets are within the range of one rotation of the eccentric shell. The first liquid distribution head controls the rotating position of the eccentric shell in the heating chamber through the electromagnetic coil and the stepping drive device, under the condition of normal operation of the system, the flow direction of the heating working medium and the defrosting working medium is quickly switched, and the defrosting and heating of each outdoor heat exchanger is efficiently completed.

[0007] Preferably, the lower part of the base plate is recessed into a hollow groove, and the base plate end cap and electromagnetic coil are disposed within the hollow groove. The upper part of the base plate is welded and fixed to the upper cover. The hollow groove supports and encloses the base plate end cap, facilitating the fixing and installation of the internal components of the base plate end cap.

[0008] More preferably, the upper cover is provided with a heating liquid inlet, which is connected to the main heating circuit. A refrigerant-water heat exchanger and an expansion valve are also sequentially installed on the main heating circuit. The working fluid in the main heating circuit enters the first-stage distributor through the heating liquid inlet, ensuring that the main heating circuit is always in normal operating condition.

[0009] More preferably, the defrost inlet is connected to the defrost branch, the defrost branch is equipped with a solenoid valve, and the circulation outlet is connected to the secondary separator head.

[0010] More preferably, the secondary liquid distributor includes several secondary liquid distribution ports, each of which is connected to a corresponding outdoor heat exchanger.

[0011] More preferably, the eccentric shell and the top cover share a common base plate, and the top wall of the eccentric shell and the top cover are separated from each other to form a space for the circulation of the heating medium.

[0012] More preferably, each outdoor heat exchanger is equipped with a temperature sensor and an independently controlled fan. The temperature sensor continuously monitors the real-time temperature of the outdoor heat exchanger and feeds it back to the system, which then controls and allocates the defrosting and heating modes for each outdoor heat exchanger.

[0013] More preferably, the working fluid after compression and heating enters the defrosting branch and the heating main branch respectively, and the system operates in both defrosting mode and heating mode simultaneously.

[0014] Defrosting mode: The high-temperature working fluid enters the defrosting branch, passes through the solenoid valve, and then enters the eccentric shell of the first-stage distributor through the defrosting inlet. Several circulation outlets include circulation outlet a, circulation outlet b, circulation outlet c...circulation outlet n. The defrosting inlet and circulation outlet a are located within the area enclosed by the eccentric shell. The working fluid is diverted to the second-stage distributor through the defrosting inlet and circulation outlet a, respectively, and then flows into the corresponding outdoor heat exchanger through each second-stage distributor. Finally, it flows back to the gas-liquid separator for gas-liquid separation.

[0015] Heating mode: The high-temperature working fluid enters the main heating circuit and transfers heat to the water through the refrigerant-water heat exchanger. After the working fluid is throttled and cooled by the expansion valve, it enters the heating chamber from the heating inlet on the top cover. In the heating chamber, the working fluid is then distributed to the secondary liquid distributors through circulation outlets b, c, ... n, and then flows into the corresponding outdoor heat exchanger through each secondary liquid distributor. After heat exchange in the outdoor heat exchanger, it flows back to the gas-liquid separator for gas-liquid separation.

[0016] Each outdoor heat exchanger outlet is connected with a gas-liquid separator; the working medium from each outdoor heat exchanger passes through the gas-liquid separator, and the vapor phase working medium is supplied to the compressor; the working medium after compression and temperature rise enters the defrosting branch and the heating main line respectively; the other end of the defrosting branch and the heating main line is connected with a primary distributor; the working medium in the heating main line enters the primary distributor through a heating liquid inlet, and then enters a heating chamber through a heating medium flow space between the eccentric shell top wall and the upper cover.

[0017] The temperature sensor of each outdoor heat exchanger detects the real-time temperature of the outdoor heat exchanger and transmits the real-time temperature to the system; the system controls the switching of the outdoor heat exchanger needing defrosting to the defrosting mode.

[0018] The electromagnetic coil and the stepping drive device are started, and the driving executive mechanism is rotated along the eccentric rotating shaft. The eccentric rotating shaft drives the eccentric shell to rotate, and when one of the circulating outlets is wrapped therein, the rotation is stopped.

[0019] The electromagnetic valve is opened, the defrosting branch is connected, and the defrosting mode is started. The high-temperature working medium enters the defrosting branch, is throttled and cooled by the expansion valve, and the defrosting liquid inlet and one of the circulating outlets in the wrapping range of the eccentric shell. The working medium enters the eccentric shell of the primary distributor through the defrosting liquid inlet, and is then distributed to the corresponding secondary distributor through the circulating outlet wrapped by the eccentric shell, and flows into the corresponding outdoor heat exchanger to defrost the outdoor heat exchanger a and then flows back to the gas-liquid separator for gas-liquid separation.

[0020] The system enters the defrosting mode and the heating mode at the same time; the expansion valve is opened, the heating main line is connected, and the heating mode is started. The high-temperature working medium enters the heating main line, exchanges heat with water through the refrigerant-water heat exchanger, and transmits heat to the water. The working medium is cooled by the expansion valve, enters the heating chamber from the heating liquid inlet of the upper cover, and is then distributed to the secondary distributor through the circulating outlet located outside the wrapping range of the eccentric shell, and finally flows into the corresponding outdoor heat exchanger, exchanges heat, and then flows back to the gas-liquid separator for gas-liquid separation.

[0021] Compared with the prior art, the system uses temperature sensors to detect the real-time temperature of the outdoor heat exchanger at any time, and feeds back to the system, and the whole system controls and distributes the defrosting mode and the heating mode of each outdoor heat exchanger. The rotating position of the eccentric shell in the heating chamber is automatically controlled by the electromagnetic coil and the stepping drive device of the primary distributor, which has the advantages of quickly switching the flow direction of the heating working medium and the defrosting working medium, and efficiently completing the defrosting and heating mode of each outdoor heat exchanger. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a system structure diagram of the application;

[0023] Figure 2A primary distribution head structure of the present application is shown in the figure;

[0024] Figure 3 A eccentric shell structure of the present application is shown in the figure;

[0025] Figure 4 A bottom plate of the present application is shown in the figure;

[0026] Figure 5 A bottom plate and bottom plate head assembly of the present application is shown in the figure. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] Please refer to the drawings Figures 1-5 A heat pump system for heating and defrosting simultaneously, comprising a gas-liquid separator 1 and a compressor 2, a heating main path 3 and a defrosting branch path 4 are connected in parallel at the outlet of the compressor 2, the other ends of the heating main path 3 and the defrosting branch path 4 are both connected with a primary distribution head 5, the primary distribution head 5 is connected with three secondary distribution heads 6, the secondary distribution heads 6 respectively comprise a secondary distribution head a 601, a secondary distribution head b 602 and a secondary distribution head c 603, each secondary distribution head is connected with an outdoor heat exchanger, the secondary distribution head comprises three secondary distribution ports, each secondary distribution port is connected with a corresponding outdoor heat exchanger 7. Each outdoor heat exchanger 7 is provided with a temperature sensor and an independently controlled fan. The temperature sensor detects the real-time temperature of the outdoor heat exchanger and transmits it to the system, and the system controls the distribution of the outdoor heat exchanger to switch between the defrosting mode and the heating mode.

[0029] Each outdoor heat exchanger outlet is connected with the gas-liquid separator; the working medium passes through the gas-liquid separator, and the vapor phase working medium is supplied to the compressor 2, the compressed and heated working medium enters the defrosting branch path 4 and the heating main path 3 respectively, and the system works in the defrosting mode and the heating mode simultaneously;

[0030] The primary distribution head 5 comprises an upper cover 501 and a bottom plate 504, the upper cover 501 is fixedly covered on the bottom plate 504, and the upper part of the bottom plate is welded and fixed with the upper cover. The upper cover is provided with a heating liquid inlet 511, the heating liquid inlet 511 is connected with the heating main path, and a refrigerant-water heat exchanger 301 and an expansion valve 302 are sequentially arranged on the heating main path 3. A part of the working medium compressed and heated by the compressor 2 is branched to the heating main path to perform the heating cycle.

[0031] The bottom plate is provided with a center hole 542, and a bottom plate end cap 503 is arranged right below the center of the bottom plate 504. The bottom plate is recessed to form a hollow groove, and the bottom plate end cap 503 and the electromagnetic coil are arranged in the hollow groove. The bottom plate end cap 503 is arranged in the hollow groove of the bottom plate. The bottom plate end cap 503 is provided with an actuator, and the bottom plate end cap is externally provided with an electromagnetic coil 505 and a stepping drive device. The electromagnetic coil and the stepping drive device control the actuator to start and stop through an electric pulse signal.

[0032] The heating cavity is formed between the upper cover and the bottom plate, and the heating cavity is provided with a liquid distribution device. The liquid distribution device comprises an eccentric shell 502 with an open bottom. The eccentric shell 502 shares the bottom plate 504 with the upper cover. The top wall of the eccentric shell and the upper cover are separated from each other and form a space for circulation of the heating medium. The working medium in the heating main circuit enters through the heating liquid inlet, and then enters the heating cavity through the heating medium circulation space between the top wall of the eccentric shell and the upper cover.

[0033] The eccentric shell is provided with an eccentric rotating shaft 521. The eccentric rotating shaft 521 is connected to the actuator through the center hole. When the electromagnetic coil and the stepping drive device are started, the actuator is driven to rotate along the eccentric rotating shaft. The eccentric rotating shaft drives the eccentric shell 502 to rotate, and when one of the circulating outlets is wrapped therein, the rotation is stopped. Embodiment

[0034] The bottom plate 504 is further provided with a defrosting liquid inlet 543 and a plurality of circulating outlets. The defrosting liquid inlet is always within the range of the large end of the eccentric shell. The defrosting liquid inlet 543 is connected to the defrosting branch 4. The defrosting branch 4 is provided with an electromagnetic valve 401. The circulating outlets are respectively connected to the secondary liquid distribution heads 6. When the electromagnetic valve 401 is opened and the defrosting branch is connected, the defrosting mode is started: the high-temperature working medium enters the defrosting branch 4, passes through the throttle valve to reduce the temperature, and the working medium enters the eccentric shell 502 of the primary liquid distribution head through the defrosting liquid inlet. All the circulating outlets are within the range of one rotation of the eccentric shell 502. The plurality of circulating outlets include the circulating outlet a 541, the circulating outlet b 544, and the circulating outlet c 545. The defrosting liquid inlet 543 and the circulating outlet a 541 are located within the wrapping range of the eccentric shell. The working medium is respectively distributed to the secondary liquid distribution head a 601 through the defrosting liquid inlet 543 and the circulating outlet a 541, and then flows into the corresponding outdoor heat exchanger a 701 through each secondary liquid distribution port, defrosts the outdoor heat exchanger a, and then returns to the gas-liquid separator for gas-liquid separation.

[0035] When the circulation outlet a 541 is located within the range wrapped by the eccentric shell 502, the circulation outlet b 544 and the circulation outlet c 545 are located outside the range wrapped by the eccentric shell 502, the working medium in the heating main path enters through the heating liquid inlet, and then enters the heating chamber through the heating medium flow space between the top wall of the eccentric shell and the upper cover. The circulation outlet b 544 and the circulation outlet c 545 are connected with the secondary distribution head b 602 and the secondary distribution head c 603 respectively, the expansion valve 302 is opened, the heating main path is connected, the heating mode is started, the high-temperature working medium enters the heating main path 3, exchanges heat through the refrigerant-water heat exchanger 301 to transfer heat to water, and then enters the heating chamber through the heating liquid inlet of the upper cover after throttling and cooling by the expansion valve 302. The working medium in the heating chamber is respectively passed through the circulation outlet b and the circulation outlet c, and is correspondingly distributed to the secondary distribution head b and the secondary distribution head c, and then flows into the corresponding outdoor heat exchanger b and the outdoor heat exchanger c through each secondary distribution port, exchanges heat through the outdoor heat exchanger b and the outdoor heat exchanger c, and then returns to the gas-liquid separator for gas-liquid separation. Embodiment

[0036] After the outdoor heat exchanger a defrosting, the electromagnetic coil and the step drive device are started, and the driving executive mechanism is rotated along the eccentric rotating shaft. The eccentric rotating shaft drives the eccentric shell to rotate, and the eccentric shell wraps the circulation outlet b when the eccentric shell rotates, and stops rotating.

[0037] Then the electromagnetic valve 401 is opened, the defrosting branch 4 is connected again, and the defrosting mode is started: the high-temperature working medium enters the defrosting branch 4, passes through the electromagnetic valve 401, and enters the eccentric shell 502 of the primary distribution head through the defrosting liquid inlet. At this time, the defrosting liquid inlet 543 and the circulation outlet b are located within the range wrapped by the eccentric shell 502, the working medium is respectively distributed to the secondary distribution head b through the defrosting liquid inlet and the circulation outlet b, and then flows into the corresponding outdoor heat exchanger b through each secondary distribution port, defrosts the outdoor heat exchanger b, and then returns to the gas-liquid separator for gas-liquid separation;

[0038] When the circulation outlet b is located within the eccentric shell wrapping range, the circulation outlet a and the circulation outlet c are both located outside the eccentric shell 502 wrapping range, the working medium in the heating main circuit 3 enters through the heating liquid inlet, and then enters the heating chamber through the heating medium flow space between the top wall of the eccentric shell 502 and the upper cover 501. The circulation outlet a and the circulation outlet c are connected with the secondary distribution head a and the secondary distribution head c respectively, the expansion valve 302 is opened, the heating main circuit is connected, and the heating mode is started: the high-temperature working medium enters the heating main circuit 3, exchanges heat through the refrigerant-water heat exchanger 301 to transfer heat to water, and then enters the heating chamber through the heating liquid inlet of the upper cover after throttling and cooling by the expansion valve 302. The working medium in the heating chamber is circulated through the circulation outlet a 541 and the circulation outlet c 545 respectively, and is correspondingly distributed to the secondary distribution head a 601 and the secondary distribution head c 603, and then flows into the corresponding outdoor heat exchanger a 701 and the outdoor heat exchanger c 703 through each secondary distribution port, exchanges heat through the outdoor heat exchanger a 701 and the outdoor heat exchanger c 703, and then returns to the gas-liquid separator for gas-liquid separation.

[0039] According to the above operation mode, each outdoor heat exchanger is switched between the defrosting mode and the heating mode, and the entire system is always in operation.

[0040] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting from any point of view, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0041] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A heat pump system for simultaneous heating and defrosting, characterized by: The application relates to a heating system, which comprises a gas-liquid separator (1) and a compressor (2), a heating main line (3) and a defrosting branch line (4) are arranged in parallel at the outlet of the compressor (2), one end of the heating main line and the defrosting branch line is connected with a first-stage distribution head (5), the first-stage distribution head (5) is connected with N second-stage distribution heads (6), each second-stage distribution head is connected with one outdoor heat exchanger (7), and the outlet of each outdoor heat exchanger is connected with the gas-liquid separator (1); The first-stage distribution head (5) comprises an upper cover (501) and a bottom plate (504), the upper cover is fixedly covered on the bottom plate, the center of the bottom plate is provided with a center hole (542), the bottom plate is provided with a bottom plate sealing head (503) directly below the center, the bottom plate sealing head is internally provided with an actuating mechanism, the bottom plate sealing head (503) is externally provided with an electromagnetic coil (505) and a stepping driving device, the electromagnetic coil and the stepping driving device control the actuating mechanism to start and stop through electric pulse signals, a heating cavity is formed between the upper cover (501) and the bottom plate (504), the heating cavity is internally provided with a distribution device, the distribution device comprises an eccentric shell (502) with an open bottom, the eccentric shell (502) is internally provided with an eccentric rotating shaft (521), the eccentric rotating shaft (521) penetrates through the center hole and is connected with the actuating mechanism, the bottom plate is further provided with a defrosting liquid inlet (543) and a plurality of circulating outlets, the defrosting liquid inlet (543) is always within the range of the large end of the eccentric shell, and all the circulating outlets are within the range of one circumferential rotation of the eccentric shell.

2. The simultaneous heating and defrosting heat pump system of claim 1, wherein: The bottom plate (504) is internally recessed into a hollow groove at the lower part, the bottom plate sealing head (503) and the electromagnetic coil are arranged in the hollow groove, and the upper part of the bottom plate is welded and fixed with the upper cover.

3. The simultaneous heating and defrosting heat pump system of claim 1, wherein: The upper cover (501) is provided with a heating liquid inlet (511), the heating liquid inlet (511) is connected with the heating main line (3), and a refrigerant-water heat exchanger (301) and an expansion valve (302) are sequentially arranged on the heating main line.

4. The simultaneous heating and defrosting heat pump system of claim 1, wherein: The defrosting liquid inlet (543) is connected with the defrosting branch line (4), the defrosting branch line (4) is provided with an electromagnetic valve (401), and the circulating outlets are connected with the second-stage distribution heads (6) respectively.

5. The simultaneous heating and defrosting heat pump system of claim 1, wherein: The second-stage distribution head (6) comprises a plurality of second-stage distribution openings, each second-stage distribution opening is connected with a corresponding outdoor heat exchanger.

6. The simultaneous heating and defrosting heat pump system of claim 1, wherein: The eccentric shell (502) shares the bottom plate (504) with the upper cover (501), the top wall of the eccentric shell and the upper cover are separated from each other and form a space for circulation of heating medium.

7. The simultaneous heating and defrosting heat pump system of Claim 1, wherein: Each outdoor heat exchanger is provided with a temperature sensor and an independently controlled fan.

8. The simultaneous heating and defrosting heat pump system according to any one of claims 1-7, wherein: The compressed and heated working medium enters the defrosting branch line (4) and the heating main line (3) respectively, and the system simultaneously works in the defrosting mode and the heating mode. Defrosting mode: high temperature working medium enters into defrosting branch (4), after electromagnetic valve (401), through defrosting liquid inlet into eccentric shell of first-stage liquid distributor (5), a plurality of circulating outlets including circulating outlet a (541), circulating outlet b (544), circulating outlet c (545)...circulating outlet n, defrosting liquid inlet and circulating outlet a are located in the range wrapped by eccentric shell, working medium is respectively distributed to second-stage liquid distributor through defrosting liquid inlet and circulating outlet a, and then flows into corresponding outdoor heat exchanger through each second-stage liquid outlet, and then returns to gas-liquid separator for gas-liquid separation; Heating mode: high temperature working medium enters into heating main line, exchanges heat through refrigerant-water heat exchanger (301) to transfer heat to water, working medium is throttled and cooled through expansion valve (302), and then enters into heating cavity from heating liquid inlet of upper cover, working medium is respectively distributed to second-stage liquid distributor through circulating outlet b, circulating outlet c...circulating outlet n in heating cavity, and then flows into corresponding outdoor heat exchanger through each second-stage liquid outlet, exchanges heat through outdoor heat exchanger, and then returns to gas-liquid separator for gas-liquid separation.

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