Centrifugal heat pump unit

Abstract

The utility model discloses a centrifugal heat pump unit which comprises a first compressor, a second compressor, a control cabinet, and a condenser, an economizer and an evaporator which are communicated in sequence, and an exhaust pipe of the first compressor is provided with a three-way pipe; the second compressor is connected in series with the first compressor through a three-way pipe; a first electric ball valve is arranged between the first compressor and the second compressor; an exhaust pipe of the second compressor is communicated with the condenser; a second electric ball valve is arranged between the economizer and the first compressor; under the heating working condition, the first electric ball valve is opened, the second electric ball valve is closed, and the first compressor and the second compressor both operate; and in a refrigeration working condition, the second electric ball valve is opened. According to the centrifugal heat pump unit, the first compressor and the second compressor are connected in series, the operation state is controlled through the control cabinet, the requirements of the heating working condition and the refrigeration working condition can be better met, automatic switching of pipelines and automatic switching of different working conditions can be achieved, and the application range of the centrifugal heat pump unit can be widened.

Description

Technical Field

[0001] This utility model relates to the field of compressors, and in particular to a centrifugal heat pump unit. Background Technology

[0002] Centrifugal heat pump units are high-efficiency and reliable dual-purpose units widely used for various industrial and commercial refrigeration needs. The compressor compresses the refrigerant and sends it to the condenser, where it cools into a liquid and releases heat. The liquid then passes through a throttling device into the economizer, where it evaporates in the evaporator, absorbing a large amount of heat and thus cooling the surrounding environment. This cycle repeats continuously, achieving both cooling and heating effects.

[0003] In existing technologies, centrifugal heat pump units are difficult to meet the needs of various operating conditions, and existing centrifugal chiller units also cannot achieve automatic switching between multiple operating conditions and a wide range of cooling capacity operation. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the above-mentioned defects of existing centrifugal heat pump units in meeting the operating conditions, and to provide a centrifugal heat pump unit.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A centrifugal heat pump unit includes: a first compressor, a second compressor, a control cabinet, and a condenser, an economizer, and an evaporator connected in sequence. The suction pipe of the first compressor is connected to the outlet of the evaporator. The discharge pipe of the first compressor is provided with a tee pipe, and the first compressor is connected to the condenser through the tee pipe. The intake pipe of the second compressor is connected in series with the first compressor through the tee pipe. A first electric ball valve is provided between the first compressor and the second compressor. The discharge pipe of the second compressor is connected to the condenser. The economizer is connected to both the first compressor and the second compressor. A second electric ball valve is provided between the economizer and the first compressor. The economizer is also connected to a third electric ball valve, which is also connected to the condenser and the first electric ball valve. The control cabinet is used to adjust the operating status of the centrifugal heat pump unit. In heating mode, the first electric ball valve is open, the second electric ball valve is closed, and both the first compressor and the second compressor are running. In cooling mode, the second electric ball valve is open, the first compressor is running, and the second compressor is off.

[0007] In this solution, by adopting the above structure, the first compressor and the second compressor are connected in series, and the control cabinet is used to control the opening or closing of the first electric ball valve and the second electric ball valve, as well as the operating status of the first compressor and the second compressor. This can better meet the needs of heating and cooling conditions, and can also realize automatic switching of pipelines and automatic switching of different operating conditions, as well as automatic adjustment of load, thereby expanding the application range of centrifugal heat pump units.

[0008] Optionally, the bottom of the condenser is connected to the economizer, and a throttling device is provided between the condenser and the economizer.

[0009] Optionally, the bottom of the economizer is connected to the evaporator via a pipe, and an electric ball valve and a throttling device are provided between the economizer and the evaporator.

[0010] Optionally, the control cabinet is located on the upper side of the evaporator.

[0011] Optionally, both the evaporator and the condenser are cylindrical, and the evaporator and the condenser are arranged side by side.

[0012] Optionally, the first compressor, the second compressor, and the economizer are all located above the evaporator.

[0013] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.

[0014] The positive and progressive effects of this utility model are as follows:

[0015] This invention connects the first and second compressors in series and uses a control cabinet to control the opening and closing of the first and second electric ball valves, as well as the operating status of the first and second compressors. This can better meet the needs of heating and cooling conditions, and can also realize automatic switching of pipelines and different operating conditions, as well as automatic load adjustment, thereby expanding the application range of centrifugal heat pump units. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a centrifugal heat pump unit according to an embodiment of the present invention.

[0017] Figure 2 for Figure 1 A schematic diagram of the centrifugal heat pump unit from another perspective.

[0018] Figure 3 for Figure 1 Main flow chart of centrifugal heat pump unit refrigeration operation.

[0019] Figure 4 for Figure 1 Main flow chart of centrifugal heat pump unit in heating mode.

[0020] Explanation of reference numerals in the attached figures:

[0021] Centrifugal heat pump unit 100

[0022] Condenser 11

[0023] Economy 12

[0024] Evaporator 13

[0025] First compressor 14

[0026] Second compressor 15

[0027] First electric ball valve 16

[0028] Second electric ball valve 17

[0029] Third electric ball valve 18

[0030] Control cabinet 19 Detailed Implementation

[0031] The present invention will be described more clearly and completely below by way of embodiments and in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiments.

[0032] like Figures 1-4As shown, this embodiment includes a centrifugal heat pump unit 100, which includes: a first compressor 14, a second compressor 15, a control cabinet 19, and a condenser 11, an economizer 12, and an evaporator 13 connected in sequence. The suction pipe of the first compressor 14 is connected to the outlet of the evaporator 13; the exhaust pipe of the first compressor 14 is provided with a tee pipe, and the first compressor 14 is connected to the condenser 11 through the tee pipe; the intake pipe of the second compressor 15 is connected in series with the first compressor 14 through the tee pipe; a first electric ball valve 16 is provided between the first compressor 14 and the second compressor 15; the exhaust pipe of the second compressor 15 is connected to the condenser... 11 is connected; the economizer 12 is connected to the first compressor 14 and the second compressor 15 respectively; a second electric ball valve 17 is provided between the economizer 12 and the first compressor 14; the economizer 12 is also connected to the third electric ball valve 18, and the third electric ball valve 18 is also connected to the condenser 11 and the first electric ball valve 16; the control cabinet 19 is used to adjust the working status of the centrifugal heat pump unit 100; when in heating mode, the first electric ball valve 16 is open, the second electric ball valve 17 is closed, and both the first compressor 14 and the second compressor 15 are running; when in cooling mode, the second electric ball valve 17 is open, the first compressor 14 is running, and the second compressor 15 is closed. By connecting the first compressor 14 and the second compressor 15 in series, and using the control cabinet 19 to control the opening or closing of the first electric ball valve 16 and the second electric ball valve 17, as well as the operating status of the first compressor 14 and the second compressor 15, the needs of heating and cooling conditions can be better met. It can also realize automatic switching of pipelines and automatic switching of different operating conditions, as well as automatic adjustment of load, thereby expanding the application range of the centrifugal heat pump unit 100.

[0033] Combination Figure 1 The bottom of the condenser 11 is connected to the economizer 12, and a throttling device is provided between the condenser 11 and the economizer 12.

[0034] The bottom of the economizer 12 is connected to the evaporator 13 via a pipe, and an electric ball valve and a throttling device are provided between the economizer 12 and the evaporator 13.

[0035] Both the evaporator 13 and the condenser 11 are cylindrical and are arranged side by side.

[0036] The first compressor 14, the second compressor 15, and the economizer 12 are all located above the evaporator 13. The control cabinet 19 is located on the upper side of the evaporator 13.

[0037] Combination Figure 1 and Figure 2The centrifugal heat pump unit 100 in this example is a series high-pressure ratio refrigeration unit, which mainly includes a control cabinet 19, an evaporator 13, a first compressor 14, a second compressor 15, a condenser 11, and an economizer 12. The outlet of the evaporator 13 is connected to the first compressor 14. The first compressor 14 is equipped with a rotary impeller. A three-way pipe is provided on the exhaust pipe of the first compressor 14. The first compressor 14 is connected to the suction pipes of the condenser 11 and the second compressor 15 through the three-way pipe. The first compressor 14 is added between the three-way pipe and the second compressor 15. In the heating mode, the ball valve is opened, and the first compressor 14 and the second compressor 15 are running.

[0038] The second compressor 15 also has a rotary impeller. The second compressor 15 is connected to the condenser 11, and the bottom of the condenser 11 is connected to the economizer 12, which is equipped with a throttling device. The upper part of the economizer 12 is connected to the first compressor 14 and the second compressor 15 respectively via a three-way pipe on the intermediate pressure pipe. In heating mode, the second electric ball valve 17 is closed. The bottom of the economizer 12 is connected to the evaporator 13 via a pipe, and it is equipped with an electric ball valve and a throttling device underneath. In cooling mode, the second electric ball valve 171 is opened, implementing a dual-stage operation with a dual-stage compression effect.

[0039] The centrifugal heat pump unit 100 can provide multi-condition operation, and the switching of the condition is achieved by opening and closing relevant valves. When the valves are electric valves, automatic switching of pipelines and operating conditions can be achieved, which is especially suitable for occasions with multi-condition requirements. Within the centrifugal heat pump unit 100, automatic load adjustment can be achieved through the first compressor 14, the second compressor 15, and various regulating valves. By setting electric ball valves, a very wide range of cooling capacity can be provided.

[0040] The centrifugal heat pump unit 100 is more efficient and energy-saving. By increasing the pressure ratio, it can effectively raise the temperature and pressure of the refrigerant, thereby outputting more heat under the same input conditions and achieving a higher energy efficiency ratio. The centrifugal heat pump unit 100 has a wider range of applications, adapting to a broad temperature regulation range and maintaining good heating performance even in cold environments, effectively solving the problem of weak heating capacity at low temperatures.

[0041] Centrifugal heat pump units are stable and reliable in operation. They can adopt advanced control systems to ensure stable and reliable operation under high pressure ratio conditions and reduce the occurrence of failures.

[0042] Centrifugal heat pump units 100 can achieve multi-condition operation: some units are equipped with a complete valve action sequence, supporting customers to achieve "single-system refrigeration" and "dual-system heating", better meeting the usage requirements under different needs.

[0043] Combination Figure 3 In refrigeration mode, the refrigerant absorbs heat from the heat transfer fluid and boils and evaporates. The refrigerant vapor produced from boiling and evaporation is drawn into the first-stage impeller of the first compressor 14. The rotating impeller generates high-temperature, high-pressure gas, which enters the condenser 11 through a check valve. The heat transfer fluid in the condenser 11 absorbs heat from the refrigerant vapor, causing it to condense into a liquid. The liquid refrigerant flowing out from the bottom of the condenser 11 enters the economizer 12 through a throttling device. The vapor in the economizer 12 is drawn into the second-stage impeller inlet of the first compressor 14 after passing through the second electric ball valve 17. The liquid refrigerant at the bottom is then throttled a second time before entering the evaporator 13. In refrigeration mode, the second compressor 15 is closed, and only the second electric ball valve 17 is open.

[0044] Combination Figure 4 In heating mode, refrigerant vapor generated by boiling in evaporator 13 is drawn into the first compressor 14. The rotating impeller increases its pressure and temperature, and it passes through a three-way valve. One path leads to the condenser 11, and the other to the suction line of the second compressor 15. After further pressure and temperature increases by the impeller of the second compressor 15, it also enters the condenser 11. The high-temperature, high-pressure refrigerant flowing out from the bottom of condenser 11 enters the economizer 12 after a first throttling process, with some refrigerant flashing into medium-pressure vapor. The flash gas at the top of economizer 12 is only supplied to the second compressor 15, at which point the first compressor 14 and the second compressor 15 operate in single-stage mode. The low-temperature, low-pressure liquid refrigerant at the bottom of economizer 12, after a second throttling process, enters the evaporator 13 for evaporation. Both condenser 11 and economizer 12 use level gauges to adjust the opening of the electric ball valves in the high-pressure and low-pressure sections based on the liquid level.

[0045] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A centrifugal heat pump unit, characterized in that, The centrifugal heat pump unit includes: The condenser, economizer, and evaporator are connected in sequence. The first compressor has an intake pipe connected to the outlet of the evaporator; the exhaust pipe of the first compressor is equipped with a three-way pipe, and the first compressor is connected to the condenser through the three-way pipe. The second compressor has its intake pipe connected in series with the first compressor via the three-way pipe; a first electric ball valve is provided between the first compressor and the second compressor; the exhaust pipe of the second compressor is connected to the condenser. The economizer is connected to the first compressor and the second compressor respectively; a second electric ball valve is provided between the economizer and the first compressor; the economizer is also connected to a third electric ball valve, and the third electric ball valve is also connected to the condenser and the first electric ball valve; The control cabinet is used to adjust the operating status of the centrifugal heat pump unit. In heating mode, the first electric ball valve is open, the second electric ball valve is closed, and both the first compressor and the second compressor are running. In cooling mode, the second electric ball valve is open, the first compressor is running, and the second compressor is closed.

2. The centrifugal heat pump unit as described in claim 1, characterized in that, The bottom of the condenser is connected to the economizer, and a throttling device is provided between the condenser and the economizer.

3. The centrifugal heat pump unit as described in claim 1, characterized in that, The bottom of the economizer is connected to the evaporator via a pipe, and an electric ball valve and a throttling device are provided between the economizer and the evaporator.

4. The centrifugal heat pump unit as described in claim 1, characterized in that, The control cabinet is located on the upper side of the evaporator.

5. The centrifugal heat pump unit as described in claim 1, characterized in that, Both the evaporator and the condenser are cylindrical, and the evaporator and the condenser are arranged side by side.

6. The centrifugal heat pump unit as described in claim 1, characterized in that, The first compressor, the second compressor, and the economizer are all located above the evaporator.

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