Chiller with buffer structure

Abstract

The application relates to a cold water machine with a buffer structure, which comprises a compressor, a condenser, a water tank, a water pump, a buffer tank and a constant air pressure control system which are connected in sequence, the compressor is connected with the water tank, the water tank is connected with the buffer tank and water using equipment respectively, the buffer tank is connected with the water using equipment, and the constant air pressure control system is connected with a compressed air inlet through an air inlet valve. The application solves the problems of poor vibration stability of a general cold water machine, large volume, high cost, inconvenient maintenance, installation and use, and low automation level.

Description

Technical Field

[0001] This invention relates to the field of chiller technology, and more specifically to a chiller with a buffer structure. Background Technology

[0002] Currently, ordinary water chillers on the market generally achieve circulation through a water pump, water tank, pipeline, and water-using equipment. They only consider cooling power, cooling effect, and constant temperature control, neglecting the structural optimization design of the circulating water system. The circulating water system of ordinary water chillers directly pumps water from the tank into the water-using equipment and then returns it to the water tank of the chiller, working in a continuous cycle. This structure has the problem of the water pump directly disturbing the water circuit, resulting in water flow vibration, which cannot meet the stability requirements of the water-using equipment in the high-frequency range.

[0003] Chinese patent application number 202310491383.6 discloses a combined chiller, which can effectively reduce water flow rate fluctuations, but it is large in size, expensive, inconvenient to maintain and install, and its refrigeration and constant pressure control systems are independent with low automation levels. Summary of the Invention

[0004] To address the problems in the prior art, this invention provides a chiller with a buffer structure, which not only effectively suppresses the vibration of the water pump on the water flow and solves the problem of poor stability of water-using equipment in the high-frequency range, but also solves the problems of large size, high cost, inconvenient maintenance, installation and use, and low level of automation.

[0005] This invention provides a chiller with a buffer structure, comprising a compressor, a condenser, a water tank, a water pump, a buffer tank, and a constant pressure control system connected in sequence. The compressor is connected to a heat exchanger inside the water tank. The water tank is connected to the buffer tank and the water-using equipment. The buffer tank is connected to the water-using equipment. The constant pressure control system is connected to a compressed air inlet via an air inlet valve. The water pump pumps water from the water tank into the buffer tank, which serves as a water storage and transfer station. Compressed air enters the constant pressure control system through the compressed air inlet, thereby driving the water flow in the buffer tank.

[0006] Furthermore, the buffer tank includes a pressure-bearing buffer container and a cover plate located above the pressure-bearing buffer container. The cover plate is provided with a constant pressure air inlet, which is connected to the constant pressure control system. The side of the pressure-bearing buffer container is provided with a water inlet, and the bottom of the pressure-bearing buffer container is provided with a water outlet, which is connected to the water-using equipment.

[0007] Furthermore, the water tank is equipped with a first level gauge and a first thermometer.

[0008] Furthermore, the cover plate is also equipped with a second level gauge, a second thermometer, and a burst valve.

[0009] Furthermore, the compressor is connected to the heat exchanger inside the water tank via a high-pressure pipeline and a low-pressure pipeline, respectively. The high-pressure pipeline is equipped with a high-pressure protection switch, a high-pressure gauge, and a refrigerant injection port, while the low-pressure pipeline is equipped with a low-pressure gauge and a first solenoid valve.

[0010] Furthermore, the condenser is connected to the low-pressure pipeline, and the condenser is connected to the water tank via a pipeline. A dryer and a second solenoid valve are installed on the pipeline connecting the condenser and the heat exchanger inside the water tank.

[0011] Furthermore, the water tank contains a displacement heating copper pipe and a heater.

[0012] Furthermore, the water tank has:

[0013] Manual water inlet;

[0014] An automatic water inlet is connected to the water tank via a multi-level adjustable throttle valve and a third solenoid valve.

[0015] The drain outlet is connected to the water tank via a first drain valve;

[0016] A fourth solenoid valve and a first flow meter are installed on the pipeline connecting the water inlet of the water-using equipment to the water-using equipment.

[0017] The water pump inlet is connected to the water pump.

[0018] A bypass return port is connected to a return branch, and a first manual valve is provided on the return branch.

[0019] Furthermore, a first pressure gauge, a second flow meter, a second manual valve, and a fifth solenoid valve are provided on the pipeline connecting the water pump and the buffer tank, and the return branch is located between the second manual valve and the fifth solenoid valve.

[0020] Furthermore, a third manual valve and a sixth solenoid valve are installed on the pipeline connecting the water outlet and the water-using equipment.

[0021] This invention adds a buffer tank, which serves as a water storage and transfer station. Water is directly pumped into the buffer tank by a water pump, and then the water in the buffer tank is driven to flow through a constant air pressure control system. Correspondingly, constant air pressure, constant liquid level, and constant temperature functions are added. With the synergistic effect of the buffer tank, constant air pressure function, and constant liquid level function, the problems of poor vibration stability of the chiller, as well as large size, high cost, inconvenient maintenance and use, and low level of automation are solved. Attached Figure Description

[0022] Figure 1 This is a connection diagram of a chiller with a buffer structure according to the present invention.

[0023] Figure 2 yes Figure 1 A schematic diagram of the structure of the buffer tank. Detailed Implementation

[0024] To make the objectives, solutions, and advantages of this invention clearer, the specific structure and working principle of this invention will be described in more detail below with reference to the accompanying drawings. The embodiments described are for illustrative purposes only and are not intended to limit the scope of application of this invention.

[0025] The purpose of the following description is to provide the public with a clearer understanding of the present invention, while those skilled in the art will be able to understand the invention clearly even without the following detailed explanation.

[0026] like Figure 1 As shown in the figure, this embodiment provides a chiller with a buffer structure for providing cooling circulation for water-using equipment 70. It includes a compressor 10, a condenser 20, a water tank 30, a water pump 40, a buffer tank 50, and a constant pressure control system 60. The compressor 10 is connected to the heat exchanger inside the condenser 20 and the water tank 30 through pipelines. The water tank 30 is also connected to the water pump 40, the buffer tank 50, and the water-using equipment 70 through pipelines. The buffer tank 50 is also connected to the water pump 40, the constant pressure control system 60, and the water-using equipment 70 through pipelines.

[0027] The compressor 10 is used for refrigeration and is connected to the heat exchanger inside the water tank 30 via two pipelines: a high-pressure pipeline 11 and a low-pressure pipeline 12. The high-pressure pipeline 11 is equipped with a high-pressure protection switch 111 and a high-pressure gauge 112 to monitor whether the compressor 10 is operating normally, and also has a refrigerant injection port 113 for injecting refrigerant. The low-pressure pipeline 12 is equipped with a low-pressure gauge 121 and a first solenoid valve 122.

[0028] The condenser 20 is connected to the high-pressure pipeline 11, and the condenser 20 is also connected to the heat exchanger inside the water tank 30 via a pipeline. A dryer 21 and a second solenoid valve 22 are installed on the pipeline connecting the condenser 20 and the water tank 30.

[0029] Water tank 30 has a manual water inlet 31, an automatic water inlet 32, a drain outlet 33, a water-using equipment inlet 34, a water pump inlet 35, and a bypass return outlet 36. The manual water inlet 31 is used for manual water supply. The automatic water inlet 32 ​​is connected to a common water source and is connected to the water tank 30 via a multi-level adjustable throttle valve 321 and a third solenoid valve 322 to prevent malfunctions caused by excessive water pressure. The drain outlet 33 is connected to the water tank 30 via a first drain valve 331. The water-using equipment inlet 34 is used to connect to a water source... For the hot water supply of the water-using equipment 70, a fourth solenoid valve 341 and a first flow meter 342 are installed on the pipeline connecting the water-using equipment inlet 34 and the water-using equipment 70; the water pump inlet 35 is connected to the water pump 40 to provide cooling water to the water pump 40, so that the cooling water in the water pump 40 flows into the buffer tank 50; the bypass return port 36 is connected to the return branch 361 to receive water returning from the buffer tank 50, and a first manual valve 362 is installed on the return branch 361 to control the flow rate of the return water.

[0030] Compared with ordinary water chillers, although a few water chillers have automatic water replenishment function, they require additional accessories and have low integration. This invention integrates automatic water replenishment into a single design, using a multi-level adjustable throttle valve + solenoid valve structure, which is suitable for water sources with a pressure of up to 10 bar.

[0031] In addition, the water tank 30 is equipped with a heat exchange copper pipe 371 and a heater 372. At the same time, the water tank 30 is equipped with a first level gauge 38 and a first thermometer 39 to monitor the water level and temperature in the water tank 30.

[0032] The water pump 40 is connected to the buffer tank 50 through a pipeline. On the pipeline connecting the water pump 40 and the buffer tank 50, there is a first pressure gauge 41, a second flow meter 42, a second manual valve 43 and a fifth solenoid valve 44. The aforementioned return branch 361 is located between the second manual valve 43 and the fifth solenoid valve 44.

[0033] Combination Figure 2In this embodiment, the buffer tank 50 includes a pressure-bearing buffer container 51 and a cover plate 52 located above the pressure-bearing buffer container 51. The cover plate 52 is equipped with a second level gauge 53, a second thermometer 54, a rupture valve 55, and a constant pressure air inlet 561. The cover plate 52 also has a spare inlet 562, which can be used to prevent disruption to the normal operation of the chiller in case the constant pressure air inlet 561 fails. The pressure-bearing buffer container 51 has an upper water inlet 571 and a lower water inlet 572 on its side, which are connected to the water pump 40 via pipelines. During normal operation of the chiller, the water level in the pressure-bearing buffer container 51 must exceed the levels of the water inlets 571 and 572; otherwise, air leakage will occur. Additionally, the pressure-bearing buffer container 51 has a water outlet 58 at its bottom. Positioning the water outlet 58 at the bottom of the pressure-bearing buffer container 51 ensures maximum utilization of the water column pressure. A second pressure gauge 59 may also be installed on the buffer tank 50 to monitor the pressure inside the buffer tank 50.

[0034] Continue to refer to Figure 1 The aforementioned constant pressure air inlet 561 is connected to the constant pressure control system 60, which in turn is connected to the compressed air inlet 61. An air inlet valve 62 is installed between the constant pressure control system 60 and the compressed air inlet 61. The water outlet 58 is connected to the water-using equipment 70 via a pipeline. A third manual valve 71 and a sixth solenoid valve 72 are installed on the pipeline connecting the water outlet 58 and the water-using equipment 70.

[0035] In this embodiment, the chiller with a buffer structure also includes a control system 80. The compressor 10, condenser 20, constant pressure control system 60, high pressure protection switch 111, high pressure gauge 112, low pressure gauge 121, solenoid valves 122 / 22 / 322 / 341 / 44 / 72, dryer 21, throttle valve 321, flow meter 342 / 42, manual valve 362 / 43 / 71, level gauge 38 / 53, thermometer 39 / 54, pressure gauge 41 / 59, and heater 372 are all connected to the control system 80 to achieve constant pressure, constant level, and constant temperature control functions.

[0036] In use, compressed air of 2 to 10 bar is connected to the air inlet 61. Water is added through the manual water inlet 31 or through the automatic water inlet 32 ​​to a common water source. Then, the fourth solenoid valve 341 is opened and the automatic water replenishment button is operated. The control system 80 automatically replenishes water according to the default upper and lower limits of the liquid level. At the same time, the manual valves 43 and 71 are opened. The automatic circulating water supply function can be realized through the one-button start and stop button. When the equipment is finished or under maintenance, the system stops running through the designed stop button. When drainage is required, the drain valve 331 can be opened to drain the water.

[0037] The chiller of this invention was tested in a monochromator, mirror box, and grating device. The test results showed that the vibration stability index of the device could be reduced from 180 nrad (RMS, 0.1-100Hz) to 28 nrad (RMS, 0.1-100Hz), which solved the problem that ordinary chillers have excessive water supply vibration and cannot meet the vibration stability requirement of <30 nrad (RMS, 0.1-100Hz).

[0038] Compared to ordinary chillers, this invention significantly improves the stability of water flow rate, reducing it from ±0.1 L / min to ±0.01 L / min, a reduction of an order of magnitude, thereby enhancing equipment stability. This invention controls flow rate by changing air pressure, eliminating the need to elevate the non-sealed water tank. Elevating the non-sealed water tank is dangerous, difficult to install and maintain, and in gravity water systems, the water level in the elevated tank gradually decreases during operation, leading to uncontrollable flow rate and fluctuations, and requiring stringent conditions to achieve temporary water level equilibrium during operation.

[0039] The chiller with a buffer structure of this invention adds a buffer tank, which serves as a water storage and transfer station. Water is directly pumped into the buffer tank by the water pump, and then the water in the buffer tank is driven to flow through a constant air pressure control system. That is, the circulation is achieved through water pump-water tank-buffer tank-pipeline-water-equipment. Then, constant air pressure, constant liquid level and constant temperature functions are added accordingly. With the synergistic effect of the buffer tank, constant air pressure function and constant liquid level function, the problem of poor vibration stability of the chiller is solved.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention. Various variations can be made to the above embodiments of the present invention. That is, all simple and equivalent changes and modifications made based on the claims and description of this invention fall within the protection scope of the claims of this patent. All aspects not described in detail in this invention are conventional technical content.

Claims

1. A chiller with a buffer structure, characterized in that, The system includes a compressor, a condenser, a water tank, a water pump, a buffer tank, and a constant pressure control system connected in sequence. The compressor is connected to the water tank, the water tank is connected to the buffer tank and water-using equipment, the buffer tank is connected to the water-using equipment, and the constant pressure control system is connected to a compressed air inlet. The water pump pumps water from the water tank into the buffer tank, which is used as a water storage and transfer station. Compressed air enters the constant pressure control system through the compressed air inlet, so that the constant pressure control system drives the water flow in the buffer tank. The buffer tank includes a pressure-bearing buffer container and a cover plate located above the pressure-bearing buffer container. The cover plate is provided with a constant pressure air inlet, which is connected to the constant pressure control system. The side of the pressure-bearing buffer container is provided with a water inlet, and the bottom of the pressure-bearing buffer container is provided with a water outlet, which is connected to the water-using equipment. The water tank is equipped with a first level gauge and a first thermometer, and a heat-dissipating copper pipe and a heater are installed inside the water tank. The cover plate of the buffer tank is also equipped with a second level gauge, a second thermometer, and a burst valve. The chiller with a buffer structure also includes a control system. The compressor, the condenser, the constant pressure control system, the first and second level gauges, and the first and second thermometers are all connected to the control system. The control system automatically replenishes water according to the default upper and lower limits of the liquid level to achieve constant pressure, constant liquid level, and constant temperature control functions. With the synergistic effect of the buffer tank, the constant pressure function, and the constant liquid level function, the problem of poor vibration stability of the chiller is solved. When the chiller is working normally, the water level in the pressure buffer container should be higher than the inlet to prevent air leakage. The water tank has the following features: The water pump inlet is connected to the water pump. A bypass return port, connected to a return branch, is used to allow the water tank to receive water returning from the buffer tank. A first manual valve is provided on the return branch. A first pressure gauge, a second flow meter, a second manual valve, and a fifth solenoid valve are installed on the pipeline connecting the water pump and the buffer tank. The return branch is located between the second manual valve and the fifth solenoid valve.

2. The chiller with a buffer structure according to claim 1, characterized in that, The compressor is connected to the heat exchanger inside the water tank via a high-pressure pipeline and a low-pressure pipeline. The high-pressure pipeline is equipped with a high-pressure protection switch, a high-pressure gauge, and a refrigerant injection port. The low-pressure pipeline is equipped with a low-pressure gauge and a first solenoid valve.

3. The chiller with a buffer structure according to claim 2, characterized in that, The condenser is connected to the high-pressure pipeline, and the condenser is connected to the heat exchanger inside the water tank through the pipeline. A dryer and a second solenoid valve are installed on the pipeline connecting the condenser and the heat exchanger inside the water tank.

4. The chiller with a buffer structure according to claim 1, characterized in that, The water tank has the following features: Manual water inlet; An automatic water inlet is connected to the water tank via a multi-level adjustable throttle valve and a third solenoid valve; The drain outlet is connected to the water tank via a first drain valve; A fourth solenoid valve and a first flow meter are installed on the pipeline connecting the water inlet of the water-using equipment to the water-using equipment.

5. The chiller with a buffer structure according to claim 1, characterized in that, A third manual valve and a sixth solenoid valve are installed on the pipeline connecting the water outlet to the water-using equipment.

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