Integrated water chilling unit suitable for high-temperature water outlet

Abstract

The utility model discloses an integrated water chilling unit suitable for high-temperature water outlet, which relates to the field of refrigeration equipment and comprises a condenser, an evaporator, a compressor, a cooling tower and a user air-conditioning terminal system. A shell pass outlet of the evaporator is connected to an air suction port of the compressor, an exhaust port of the compressor is connected to a shell pass inlet of the condenser, and a shell pass outlet of the condenser is connected with a shell pass inlet of the evaporator through the throttling device to form refrigerant circulation of the water chilling unit. The tube pass of the condenser is connected to the cooling tower through a cooling water inlet pipeline and a cooling water outlet pipeline to form cooling water heat exchange circulation; a heat exchange tube of the evaporator has two flow paths. The water outlet pipes are respectively arranged at the two ends of the evaporator, and the circulating water path is switched through the electric butterfly valve arranged on the external water path, so that the free switching of double modes of single-flow heat exchange and two-flow heat exchange of the evaporator is realized.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration equipment, specifically to an integrated chiller unit suitable for high-temperature water output. Background Technology

[0002] Currently, the national standard GB-T 18430.1 defines the operating range of chiller units as 5–15℃. Refrigeration equipment manufacturers often optimize their designs for this temperature range, such as using compressors optimized for refrigeration applications, which are relatively cheaper but have a narrower safe operating range. If chilled water above 15℃ is required, without changing the compressor, the evaporator heat exchange area needs to be limited to keep the evaporation temperature relatively low due to the operating range limitation of the refrigeration application-optimized compressor. This results in a smaller heat exchange area within the typical 5–15℃ outlet water temperature range, significantly reducing the unit's operating efficiency. A common solution is to add intermediate heat exchangers and water tanks to the external chilled water circuit of the chiller unit, using secondary heat exchange to meet the user's high outlet water temperature requirements. However, this solution significantly increases equipment costs and piping complexity. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide an integrated chiller unit suitable for high-temperature water outlet. It features outlet pipes at both ends of the evaporator, and an electric butterfly valve on the external water line switches the circulating water path, enabling free switching between single-pass and two-pass heat exchange modes. In two-pass heat exchange mode, the entire heat exchange area of ​​the evaporator is used to achieve efficient cooling within the conventional outlet water temperature range of 5–15℃. In single-pass heat exchange mode, the evaporator heat exchange area is reduced, allowing for higher outlet water temperatures while keeping the evaporation temperature at a lower level, within the compressor's safe operating range. This eliminates the need for additional intermediate heat exchange equipment and simplifies water circulation piping, saving costs.

[0004] The purpose of this utility model is achieved through the following technical solution: This integrated chiller unit suitable for high-temperature water output includes a condenser, an evaporator, a compressor, a cooling tower, and a user air conditioning terminal system;

[0005] The shell-side outlet of the evaporator is connected to the suction port of the compressor, the discharge port of the compressor is connected to the shell-side inlet of the condenser, and the shell-side outlet of the condenser is connected to the shell-side inlet of the evaporator through a throttling device, forming a refrigerant cycle for the chiller unit.

[0006] The tube side of the condenser is connected to the cooling tower through cooling water inlet and cooling water outlet pipes to form a cooling water heat exchange cycle.

[0007] The evaporator's heat exchange tubes have a two-pass design. One side water chamber is located at one end of the evaporator shell, with a side water outlet pipe for connecting to the high-temperature water outlet line. The other end of the shell has two side water chambers, each with two side inlet pipes for connecting to the chilled water inlet line and two side outlet pipes for connecting to the low-temperature water outlet line. The high-temperature and low-temperature water outlet lines merge near the user's air conditioning terminal system to form the chilled water outlet line, which connects to the inlet of the user's air conditioning terminal system. The chilled water inlet line connects to the outlet of the user's air conditioning terminal system, forming a chilled water heat exchange cycle. An electric butterfly valve A is installed on the high-temperature water outlet line, and an electric butterfly valve B is installed on the low-temperature water outlet line.

[0008] As a further technical solution, when electric butterfly valve A is open and electric butterfly valve B is closed, the chilled water inlet pipe is connected to the high-temperature outlet pipe, and the chilled water passes through the evaporator for single-pass heat exchange to one side water chamber, forming a high-temperature outlet water circulation.

[0009] As a further technical solution, when electric butterfly valve A is closed and electric butterfly valve B is open, the chilled water inlet pipe is connected to the low-temperature outlet pipe, and the chilled water exchanges heat through the evaporator to the two side water chambers, forming a low-temperature outlet water circulation.

[0010] As a further technical solution, the evaporator can be a flooded evaporator or a falling film evaporator.

[0011] As a further technical solution, a flow switch and a temperature sensor are installed on the chilled water outlet pipe.

[0012] As a further technical solution, a chilled water pump is installed on the chilled water inlet pipe.

[0013] As a further technical solution, a cooling pump is installed on the cooling water inlet pipe.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. Water outlet pipes are installed at both ends of the evaporator, and the circulating water path is switched by an electric butterfly valve to achieve single-pass or two-pass heat exchange mode of the evaporator. In the two-pass heat exchange mode, the entire heat exchange area of ​​the evaporator is used to achieve efficient cooling within the conventional outlet water temperature range of 5-15℃. In the single-pass heat exchange mode, the heat exchange area of ​​the evaporator is reduced, which can meet the high outlet water temperature while controlling the evaporation temperature at a lower level, without exceeding the safe operating range of the compressor. This eliminates the need for additional intermediate heat exchange equipment and simplifies the water circulation piping, saving costs.

[0016] 2. A flow switch and a temperature sensor are installed on the chilled water outlet pipe to detect the water flow status and water temperature respectively, ensuring the stable operation of the system. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the evaporator in this utility model.

[0019] Explanation of reference numerals in the attached diagram: 1. Condenser; 2. Evaporator; 3. Compressor; 4. Throttling device; 5. Chilled water inlet pipe; 6. Chilled water outlet pipe; 601. High-temperature outlet pipe; 602. Low-temperature outlet pipe; 7. Cooling water inlet pipe; 8. Cooling tower; 9. User air conditioning terminal system; 10. Electric butterfly valve A; 11. Electric butterfly valve B; 12. Chilled water pump; 13. Cooling pump; 14. Flow switch; 15. Temperature sensor; 16. One-sided water chamber; 211. Two-sided water chamber; 212. Shell; 213. One-sided outlet pipe; 22. Two-sided inlet pipe; 23. Two-sided outlet pipe. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings:

[0021] Example: As attached Figure 1 , 2 As shown, this integrated chiller unit suitable for high-temperature water outlet includes a condenser 1, an evaporator 2, a compressor 3, a throttling device 4, a chilled water inlet pipe 5, a chilled water outlet pipe 6, a high-temperature water outlet pipe 601, a low-temperature water outlet pipe 602, a cooling water inlet pipe 7, a cooling water outlet pipe 8, a cooling tower 9, a user air conditioning terminal system 10, an electric butterfly valve A11, an electric butterfly valve B12, a chilled water pump 13, a cooling water pump 14, a flow switch 15, a temperature sensor 16, a one-sided water chamber 211, two-sided water chambers 212, a cylinder 213, a one-sided water outlet pipe 21, two-sided water inlet pipes 22, and two-sided water outlet pipes 23.

[0022] Reference Appendix Figure 1 The shell-side outlet of evaporator 2 is connected to the suction port of compressor 3, and the discharge port of compressor 3 is connected to the shell-side inlet of condenser 1. Meanwhile, the shell-side outlet of condenser 1 is connected to the shell-side inlet of evaporator 2 through throttling device 4, thereby forming a refrigerant cycle for the chiller unit.

[0023] Furthermore, the inlet and outlet of the condenser 1 are connected to the cooling water inlet pipe 7 and the cooling water outlet pipe 8, respectively, and then connected to the cooling tower 9 via the cooling water inlet pipe 7 and the cooling water outlet pipe 8. A cooling pump 14 is installed on the cooling water inlet pipe 7, thus forming a cooling water heat exchange cycle. After absorbing heat from the refrigerant in the condenser 1, the cooling water is transported to the cooling tower 9 by the cooling pump 14 for cooling. The cooling tower 9 cools the water by exchanging heat with the air and then returns it to the condenser 1.

[0024] like Figure 1 , 2As shown, the heat exchange tubes of the evaporator 2 (preferably a flooded evaporator or a falling film evaporator) are two-pass. A side water chamber 211 is provided at the left end of the cylinder 213 of the evaporator 2. A side water outlet pipe 21 is provided on the side water chamber 211, and the side water outlet pipe 21 is connected to the high temperature water outlet pipe 601. Two water chambers 212 are provided on the right end of the cylinder 213. Two water inlet pipes 22 and two water outlet pipes 23 are provided on the two water chambers 212. The two water inlet pipes 22 are used to connect to the chilled water inlet pipe 5, and the two water outlet pipes 23 are used to connect to the low temperature outlet pipe 602. The high temperature outlet pipe 601 and the low temperature outlet pipe 602 merge (pipes merge) near the user's air conditioning terminal system 10 to form the chilled water outlet pipe 6, which is then connected to the inlet of the user's air conditioning terminal system 10. The chilled water inlet pipe 5 is connected to the outlet of the user's air conditioning terminal system 10. A chilled water pump 13 is installed on the chilled water inlet pipe 5 to form a chilled water heat exchange cycle.

[0025] Furthermore, an electric butterfly valve A11 is installed on the high-temperature water outlet pipe 601, and an electric butterfly valve B12 is installed on the low-temperature water outlet pipe 602. Both electric butterfly valves A11 and B12 are switched by external control signals to control their opening or closing. When electric butterfly valve A11 is open and electric butterfly valve B12 is closed, the chilled water inlet pipe 5 is connected to the high-temperature water outlet pipe 601. The chilled water passes through the evaporator 2 for single-pass heat exchange to one side water chamber 211. The heat exchange area used by the evaporator 2 is reduced, which can meet the high outlet water temperature while controlling the evaporation temperature at a lower level, without exceeding the safe operating range of the compressor, thus forming a high-temperature water outlet circulation.

[0026] When the electric butterfly valve A11 is closed and the electric butterfly valve B12 is opened, the chilled water inlet pipe 5 is connected to the low-temperature outlet pipe 602. The chilled water is transferred to the two side water chambers 212 through the two-stage heat exchange of the evaporator 2, using the entire heat exchange area of ​​the evaporator 2 to achieve efficient cooling within the conventional outlet water temperature range of 5 to 15℃, forming a low-temperature outlet water circulation.

[0027] Preferably, a flow switch 15 and a temperature sensor 16 are installed on the chilled water outlet pipe 6 to detect the water flow status and water temperature respectively, thereby ensuring the stable operation of the system.

[0028] The working process of this utility model:

[0029] When electric butterfly valve A11 is open and electric butterfly valve B12 is closed, the chilled water inlet pipe 5 is connected to the high-temperature outlet pipe 601. Chilled water undergoes heat exchange through a single pass (tube pass) of evaporator 2 to one side water chamber 211 of evaporator 2. The heat exchanger area of ​​evaporator 2 is reduced (only a portion of the heat exchange area is used), allowing for high outlet water temperature while maintaining a lower evaporation temperature, not exceeding the compressor's safe operating range, thus forming a high-temperature outlet water circulation. When electric butterfly valve A11 is closed and electric butterfly valve B12 is open, the chilled water inlet pipe 5 is connected to the low-temperature outlet pipe 602. Chilled water undergoes heat exchange through two passes (tube pass) of evaporator 2 to both side water chambers 212 of evaporator 2, utilizing the entire heat exchange area of ​​evaporator 2 to achieve efficient cooling within the conventional 5–15℃ outlet water temperature range, forming a low-temperature outlet water circulation.

[0030] It is understood that, for those skilled in the art, any equivalent substitutions or modifications to the technical solutions and inventive concepts of this utility model should fall within the protection scope of the appended claims.

Claims

1. An integrated chiller unit suitable for high-temperature water output, characterized in that: It includes a condenser (1), an evaporator (2), a compressor (3), a cooling tower (9), and a user air conditioning terminal system (10); The shell-side outlet of the evaporator (2) is connected to the suction port of the compressor (3), the discharge port of the compressor (3) is connected to the shell-side inlet of the condenser (1), and the shell-side outlet of the condenser (1) is connected to the shell-side inlet of the evaporator (2) through the throttling device (4) to form a refrigerant cycle for the chiller unit. The tube side of the condenser (1) is connected to the cooling tower (9) through the cooling water inlet pipe (7) and the cooling water outlet pipe (8) to form a cooling water heat exchange cycle; The heat exchange tubes of the evaporator (2) are in two-pass configuration. A side water chamber (211) is provided at one end of the shell (213) of the evaporator (2), and a side water outlet pipe (21) is provided on the side water chamber (211) for connecting to the high-temperature water outlet pipe (601). A second side water chamber (212) is provided at the other end of the shell (213), and a second side water inlet pipe (22) for connecting to the chilled water inlet pipe (5) and a second side water outlet pipe (23) for connecting to the low-temperature water outlet pipe (602) are provided on the second side water chamber (212). The high-temperature water outlet pipe (601) and the low-temperature water outlet pipe (602) merge near the user's air conditioning terminal system (10) to form a chilled water outlet pipe (6) and connect to the inlet of the user's air conditioning terminal system (10). The chilled water inlet pipe (5) is connected to the outlet of the user's air conditioning terminal system (10) to form a chilled water heat exchange cycle. An electric butterfly valve A (11) is provided on the high-temperature water outlet pipe (601) and an electric butterfly valve B (12) is provided on the low-temperature water outlet pipe (602).

2. The integrated chiller unit suitable for high-temperature water output according to claim 1, characterized in that: When the electric butterfly valve A (11) is opened and the electric butterfly valve B (12) is closed, the chilled water inlet pipe (5) is connected to the high-temperature outlet pipe (601), and the chilled water passes through the evaporator (2) for single-pass heat exchange to the water chamber (211) on one side, forming a high-temperature outlet water circulation.

3. The integrated chiller unit suitable for high-temperature water output according to claim 1, characterized in that: When the electric butterfly valve A (11) is closed and the electric butterfly valve B (12) is opened, the chilled water inlet pipe (5) is connected to the low-temperature outlet pipe (602), and the chilled water is transferred to the two side water chambers (212) through the two-stage heat exchange of the evaporator (2) to form a low-temperature outlet water circulation.

4. The integrated chiller unit suitable for high-temperature water output according to claim 1, characterized in that: The evaporator (2) is either a flooded evaporator or a falling film evaporator.

5. The integrated chiller unit suitable for high-temperature water output according to claim 1, characterized in that: A flow switch (15) and a temperature sensor (16) are installed on the chilled water outlet pipe (6).

6. The integrated chiller unit suitable for high-temperature water output according to claim 1, characterized in that: A chilled water pump (13) is installed on the chilled water inlet pipe (5).

7. The integrated chiller unit suitable for high-temperature water output according to claim 1, characterized in that: A cooling pump (14) is installed on the cooling water inlet pipe (7).

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