A chiller refrigerating capacity measuring device and method

Abstract

The application discloses a water chiller refrigerating capacity measuring device and method. The device comprises a test water tank, a single-pass serpentine flow channel is arranged in the test water tank, a water inlet of the single-pass serpentine flow channel is arranged below the test water tank, a water outlet of the single-pass serpentine flow channel is arranged above the test water tank, the water outlet of the single-pass serpentine flow channel is connected with a water inlet of a water chiller through a first pipeline, the water inlet of the single-pass serpentine flow channel is connected with a water outlet of the water chiller through a second pipeline, an outlet temperature sensor is arranged on one side of the first pipeline close to the water inlet of the water chiller, and an inlet temperature sensor is arranged on one side of the second pipeline close to the water outlet of the water chiller. The water chiller refrigerating capacity is calculated by monitoring the water temperature, water flow, circulating water volume and test time of the water chiller inlet and outlet, so that the power of the heater is prevented from exceeding the limit of the rated current of the environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration capacity measurement, and particularly relates to a water chiller refrigeration capacity measurement device and method. BACKGROUND

[0002] The water chiller is a device for ensuring that a precision instrument works in a constant temperature condition. The instrument with high precision and high energy density generates a large amount of heat during processing. If the heat is not removed in time, the instrument will be damaged due to overheating. With the protection of the water chiller, the instrument can be processed in a constant temperature condition. The water chiller is initially used for spindle carving equipment, CO2 laser cutting machines and CO2 laser marking machines, and has now developed to refrigeration that can satisfy fiber laser cutting machines, ultraviolet laser cutting / marking equipment, ultrafast laser equipment, medical equipment and laboratory equipment. The water chiller is more complete in types and can satisfy the refrigeration requirements of various fields in industrial production.

[0003] However, the refrigeration capacity requirements of various fields are different, so the water chiller is divided into different models according to different refrigeration capacities. After the product is produced, the refrigeration capacity of the water chiller needs to be tested to ensure that the actual refrigeration capacity of the water chiller is consistent with the calibrated refrigeration capacity. Figure 4 The structure of the commonly used refrigeration capacity measurement device includes A1. original quick connector, A2. original inlet temperature sensor, A3. original pressure gauge, A4. original needle valve, A5. original flowmeter, A6. original resistance heater, A7. original outlet temperature sensor, A8. original quick connector and A9. original water chiller.

[0004] The A2 original inlet temperature sensor measures the water temperature at the inlet, the A7 original outlet temperature sensor measures the water temperature at the outlet, the A1 original quick connector and the A8 original quick connector are used for quickly connecting the inlet and outlet of the measured water chiller, the A3 original pressure gauge and the A5 original flowmeter measure the pressure and flow of the measured water chiller, the A4 original needle valve is used for adjusting the flow of the water chiller, and the A6 original resistance heater can be adjusted in power.

[0005] When the test is started, the resistance heater is adjusted so that the temperature of the inlet temperature sensor is basically equal to the ambient temperature, and the temperature is stable for a period of time. At this time, the power of the resistance heater is the refrigeration capacity of the water chiller.

[0006] However, the power of the resistance heater in this method has certain limitations. If the refrigeration capacity of the measured water chiller is large, the power of the heater may exceed the rated current required by the environment, so this method for testing the refrigeration capacity has certain limitations. SUMMARY

[0007] The application solves the problem that the prior art cannot effectively detect a water chiller with large refrigerating capacity, and provides a water chiller refrigerating capacity measuring device and method.

[0008] To achieve the above object, the following technical scheme is provided.

[0009] The water chiller refrigerating capacity measuring device comprises a test water tank, a single-pass serpentine flow channel is arranged in the test water tank, a water inlet of the single-pass serpentine flow channel is arranged below the test water tank, a water outlet of the single-pass serpentine flow channel is arranged above the test water tank, the water outlet of the single-pass serpentine flow channel is connected to a water inlet of the water chiller through a first pipeline, the water inlet of the single-pass serpentine flow channel is connected to a water outlet of the water chiller through a second pipeline, an outlet temperature sensor is arranged on one side of the first pipeline close to the water inlet of the water chiller, and an inlet temperature sensor is arranged on one side of the second pipeline close to the water outlet of the water chiller.

[0010] The water chiller refrigerating capacity measuring device comprises a test water tank, a single-pass serpentine flow channel is arranged in the test water tank, a water inlet of the single-pass serpentine flow channel is arranged below the test water tank, a water outlet of the single-pass serpentine flow channel is arranged above the test water tank, the water outlet of the single-pass serpentine flow channel is connected to a water inlet of the water chiller through a first pipeline, the water inlet of the single-pass serpentine flow channel is connected to a water outlet of the water chiller through a second pipeline, an outlet temperature sensor is arranged on one side of the first pipeline close to the water inlet of the water chiller, and an inlet temperature sensor is arranged on one side of the second pipeline close to the water outlet of the water chiller.

[0011] Preferably, a plurality of guide plates are arranged in the test water tank, the plurality of guide plates are arranged in parallel, each of the guide plates is provided with a plurality of guide holes on one side, the guide holes of adjacent guide plates are arranged in mirror image, and the plurality of guide plates form the single-pass serpentine flow channel.

[0012] Preferably, a first tower joint is arranged on the outside of the test water tank between the bottom of the test water tank and the bottommost layer of the guide plates as the water inlet of the single-pass serpentine flow channel, and a second tower joint is arranged on the outside of the test water tank between the top of the test water tank and the topmost layer of the guide plates as the water outlet of the single-pass serpentine flow channel. The first pipeline is connected to the second tower joint and a first quick connector of the water chiller, and the second pipeline is connected to the first tower joint and a second quick connector of the water chiller.

[0013] Preferably, a pressure gauge, a needle valve and a flow meter are arranged on the second pipeline. The pressure gauge is used to measure the water pressure in the second pipeline, the needle valve is used to control the on-off of the water flow in the second pipeline, and the flow meter is used to detect the flow of the water flow in the second pipeline.

[0014] As preferred, the test water tank comprises a tank body and a tank cover fixed on the top of the tank body, a water filling hole and an air exhaust valve are arranged in the middle of the tank cover, a water filling cover is threadedly connected on the water filling hole, and a water discharge valve is arranged at the bottom of the tank body. The water filling hole is used for filling water into the test water tank, the water filling cover is used for ensuring the air tightness in the test water tank during testing, the air exhaust valve is used for adjusting the air pressure in the test water tank, and the water discharge valve is used for discharging water in the test water tank.

[0015] As preferred, a liquid level switch is arranged on the tank cover, and the height of the liquid level switch in the test water tank is higher than that of the second tower joint.

[0016] The purpose of arranging the liquid level switch is to monitor the water level in the test water tank, and the height of the liquid level switch in the test water tank is higher than that of the second tower joint, that is, the second tower joint is used as a reference to prevent the water level from being too low to cause air to be sucked into the waterway.

[0017] As preferred, the test water tank is wrapped with a heat preservation sponge outside, and the test water tank is provided with casters at the bottom. The test water tank is wrapped with a heat preservation sponge outside, so as to reduce the heat dissipation of the test water tank itself and cause greater test error. The test water tank is provided with casters, so as to facilitate movement.

[0018] As preferred, a first temperature sensor is arranged near the water inlet of the single-pass serpentine flow channel, and a second temperature sensor is arranged near the water outlet of the single-pass serpentine flow channel.

[0019] A cold water machine refrigerating capacity measurement method adopts the cold water machine refrigerating capacity measurement device, and comprises the following steps.

[0020] In the refrigeration working condition, when the set temperature of the cold water machine is lower than the normal temperature of the water in the test water tank, the refrigerating capacity of the cold water machine is:

[0021] Q 冷 =C p *ρ 水 *V*(T2-T1) / t

[0022] In the heating working condition, when the set temperature of the cold water machine is higher than the normal temperature of the water in the test water tank, the heating capacity of the cold water machine is:

[0023] Q 冷 =C p *ρ 水 *V*(T1-T2) / t

[0024] Wherein, C p is the specific heat of water at constant pressure: 4.2 kJ / kg℃; ρ 水 is the density of water: 1000 kg / m 3 ; V is the total water volume, unit: m3 t is time, unit s; T1 is the water temperature of the inlet, unit ℃; T2 is the water temperature of the outlet, unit ℃.

[0025] The beneficial effects of the present application are:

[0026] 1. A method for calculating the refrigerating capacity of a water chiller by using a test water tank connected to the water chiller, using only water as the medium, and calculating the refrigerating capacity of the water chiller through the water temperature of the inlet and outlet.

[0027] 2. The test water tank uses a flow guide plate, so that the water in the water tank can flow in a single pass, ensuring that the water that enters first flows out first, maintaining the stability of the water temperature.

[0028] 3. The test water tank has wheels, making it easy to move. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a schematic diagram of the device principle of the embodiment;

[0030] Figure 2 is a schematic diagram of the test water tank placement structure of the embodiment;

[0031] Figure 3 is a schematic diagram of the flow guide plate structure of the embodiment;

[0032] Figure 4 is a schematic diagram of the commonly used test system principle;

[0033] A1. original quick connector, A2. original inlet temperature sensor, A3. original pressure gauge, A4. original needle valve, A5. original flow meter, A6. original resistance heater, A7. original outlet temperature sensor, A8. original quick connector, A9. original water chiller, B. water chiller, B1. compressor, B2. evaporator, B3. throttling device, B4. condenser, B5. fan, B6. water chiller tank, B7. water pump, B8. first quick connector, B9. second quick connector, C1. inlet temperature sensor, C2. pressure gauge, C3. needle valve, C4. flow meter, C5. flow guide plate, C51. flow guide hole, C6. test water tank, C7. outlet temperature sensor, C68. liquid level switch, C69. water filling cover, C70. exhaust valve, C61. water tank cover, C62. drain valve, C63. wheels, C64. first temperature sensor, C65. first tower connector, C66. second temperature sensor, C67. second tower connector, C71. heat preservation sponge. DETAILED DESCRIPTION

[0034] Example 1:

[0035] The cold water machine B tested in the embodiment has the following structure: it comprises B1. compressor, B2. evaporator, B3. throttling device, B4. condenser, B5. fan, B6. cold water machine water tank, B7. water pump, B8. first quick connector, B9. second quick connector.

[0036] The embodiment provides a cold water machine refrigeration capacity measuring device, which comprises a test water tank C6, the test water tank C6 is internally provided with a single-pass serpentine flow channel, a water inlet of the single-pass serpentine flow channel is arranged below the test water tank C6, a water outlet of the single-pass serpentine flow channel is arranged above the test water tank C6, the water outlet of the single-pass serpentine flow channel is connected with a water inlet of the cold water machine B through a first pipeline, the water inlet of the single-pass serpentine flow channel is connected with a water outlet of the cold water machine B through a second pipeline, an outlet temperature sensor C7 is arranged on one side of the first pipeline close to the water inlet of the cold water machine B, and an inlet temperature sensor C1 is arranged on one side of the second pipeline close to the water outlet of the cold water machine B.

[0037] The test water tank C6 is internally provided with a plurality of guide plates C5, the plurality of guide plates C5 are arranged in parallel, one side of each guide plate C5 is provided with a plurality of guide holes C51, the guide holes C51 of adjacent guide plates C5 are arranged in mirror image, and the plurality of guide plates C5 form the single-pass serpentine flow channel.

[0038] A first pagoda joint C65 is arranged between the bottom of the test water tank C6 and the bottommost layer of the guide plates C5 on the outer side of the test water tank C6 as the water inlet of the single-pass serpentine flow channel, and a second pagoda joint C67 is arranged between the top of the test water tank C6 and the topmost layer of the guide plates C5 on the outer side of the test water tank C6 as the water outlet of the single-pass serpentine flow channel. The first pipeline connects the second pagoda joint C67 and the first quick connector B8 of the cold water machine B, and the second pipeline connects the first pagoda joint C65 and the second quick connector B9 of the cold water machine B.

[0039] The second pipeline is provided with a pressure gauge C2, a needle valve C3 and a flowmeter C4. The pressure gauge C2 is used for measuring the water pressure in the second pipeline, the needle valve C3 is used for controlling the on-off of the water flow in the second pipeline, and the flowmeter C4 is used for detecting the flow of the water flow in the second pipeline.

[0040] The test water tank C6 comprises a tank body and a water tank cover C61 fixed to the top of the tank body, a water filling hole and an exhaust valve C70 are arranged in the middle of the water tank cover C61, a water filling cover C69 is threadedly connected to the water filling hole, and a drain valve C62 is arranged at the bottom of the tank body. The water filling hole is used for filling water into the test water tank C6, the water filling cover C69 is used for ensuring the air tightness in the test water tank during testing, the exhaust valve C70 is used for adjusting the air pressure in the test water tank, and the drain valve C62 is used for draining water in the test water tank C6.

[0041] The water tank cover C61 is provided with a liquid level switch C68, and the liquid level switch C68 is located at a height higher than the second pagoda joint C67 in the test water tank.

[0042] The purpose of the liquid level switch C68 is to monitor the water level in the test water tank C6. The liquid level switch C68 is located at a height higher than the second tower joint C67 in the test water tank, that is, it is higher than the second tower joint C67. This prevents the water level from being too low, causing air to be drawn into the water circuit.

[0043] The test water tank C6 is wrapped with thermal insulation sponge C71 on the outside, and the test water tank C6 is provided with casters C63 at the bottom. The test water tank is wrapped with thermal insulation sponge on the outside, which is to reduce the heat dissipation of the test water tank itself and cause greater errors in the test. The test water tank is provided with casters C63, which is to facilitate movement.

[0044] The working principle is as follows:

[0045] The test water tank C6 is connected to the water chiller B through the first quick connector B8 and the second quick connector B9. Before testing, the water injection cover C69 and the exhaust valve C70 of the test water tank C6 are tightened to ensure the airtightness of the test water tank. Then inject normal temperature water into the water tank B6, and the water will flow into the test water tank C6 along the pipeline, which is higher than the second tower joint C67. The test water tank is provided with casters C63, which is to facilitate movement. The liquid level switch C68 is used to monitor the water level in the test water tank C6 to prevent the water level from being too low, causing air to be drawn into the water circuit. After a period of use, the exhaust valve C70 needs to be vented to balance the pressure in the test water tank C6. The test water tank C6 is wrapped with thermal insulation sponge on the outside, which is to reduce the heat dissipation of the test water tank itself and cause greater errors in the test.

[0046] When the test starts, turn on the switch of the water chiller B, and use the water pump B7 of the water chiller B to circulate the water in the pipeline and the test water tank C6. Set the temperature of the water chiller B, which is lower than the normal temperature water in the test water tank C6, and the test result is the refrigerating capacity; higher than the normal temperature water in the test water tank C6, and the test result is the heating capacity. Adjust the needle valve C3 to control the water flow, and the flow result is displayed through the flow meter C4. The pressure gauge C2 is used to display the water circuit pressure after being pumped out by the water pump B7. The test water tank C6 has multiple layers of flow guide plates C5, and the flow guide plates have flow guide holes C51. The direction of each layer of flow guide plates is opposite, which makes the water flow in a snake shape in the test water tank C6, which enhances the water flow and heat exchange, and ensures the stability of the water temperature.

[0047] A water chiller refrigerating capacity measurement method using the above-mentioned water chiller refrigerating capacity measurement device, comprising the following steps:

[0048] Refrigeration condition: when the water temperature in the water tank C6 is lower than the set temperature of the water chiller B, the water temperature T1 is measured by the inlet temperature sensor C1. The water in the pipeline flows into the test water tank through the first tower joint C65, circulates in the test water tank, and then flows out through the second tower joint C67. The water temperature T2 is measured by the outlet temperature sensor C7. After a certain time t, the water temperatures T1 and T2 are recorded, and the refrigeration capacity of the water chiller is calculated as follows:

[0049] Q 冷 = C p * p 水 * V * (T2-T1) / t

[0050] Heating condition: when the water temperature in the water tank C6 is higher than the set temperature of the water chiller B, the water temperature T1 is measured by the inlet temperature sensor C1. After circulating in the test water tank, the water temperature T2 is measured by the outlet temperature sensor C7. After a certain time t, the water temperatures T1 and T2 are recorded, and the heating capacity of the water chiller is calculated as follows:

[0051] Q 冷 = C p * p 水 * V * (T1-T2) / t

[0052] wherein C p is the specific heat of water at constant pressure: 4.2 kJ / kg℃; p 水 is the density of water: 1000 kg / m 3 ; V is the total water volume, unit: m 3 ; t is the time, unit: s; T1 is the inlet water temperature, unit: ℃; T2 is the outlet water temperature, unit: ℃.

[0053] Example 2:

[0054] In this embodiment, the first temperature sensor C64 is arranged near the inlet of the single-pass serpentine flow passage in the test water tank C6, and the second temperature sensor C66 is arranged near the outlet of the single-pass serpentine flow passage in the test water tank C6. The purpose is to improve the accuracy of water temperature detection and reduce the error caused by heat dissipation in the pipeline. In the method, the value of T1 is the average of the measured values of the inlet temperature sensor C1 and the first temperature sensor C64, and the value of T2 is the average of the measured values of the outlet temperature sensor C7 and the second temperature sensor C66.

Claims

1. A chiller refrigerating capacity measuring device, characterized by, The test water tank (C6) is provided with a single-pass serpentine flow channel, the water inlet of the single-pass serpentine flow channel is arranged below the test water tank (C6), the water outlet of the single-pass serpentine flow channel is arranged above the test water tank (C6), the water outlet of the single-pass serpentine flow channel is connected with the water inlet of the water cooler (B) through a first pipeline, the water inlet of the single-pass serpentine flow channel is connected with the water outlet of the water cooler (B) through a second pipeline, the first pipeline is provided with an outlet temperature sensor (C7) near one side of the water inlet of the water cooler (B), and the second pipeline is provided with an inlet temperature sensor (C1) near one side of the water outlet of the water cooler (B).

2. The refrigerating capacity measuring device for a cold water machine according to claim 1, wherein The test water tank (C6) is provided with a plurality of guide plates (C5), the plurality of guide plates (C5) are arranged in parallel, one side of each guide plate (C5) is provided with a plurality of guide holes (C51), the guide holes (C51) of adjacent guide plates (C5) are mirror arranged, and the plurality of guide plates (C5) form a single-pass serpentine flow channel.

3. The refrigerating capacity measuring device for a cold water machine according to claim 2, wherein The test water tank (C6) is provided with a first tower joint (C65) as the water inlet of the single-pass serpentine flow channel between the bottom of the test water tank (C6) and the bottommost guide plate (C5), and the test water tank (C6) is provided with a second tower joint (C67) as the water outlet of the single-pass serpentine flow channel between the top of the test water tank (C6) and the topmost guide plate (C5).

4. The device for measuring refrigerating capacity of a water chiller according to claim 1, wherein, The second pipeline is provided with a pressure gauge (C2), a needle valve (C3) and a flowmeter (C4).

5. The device for measuring the refrigerating capacity of a water chiller according to claim 4, wherein the device is characterized in that, The test water tank (C6) comprises a tank body and a water tank cover (C61) fixed to the top of the tank body, the middle of the water tank cover (C61) is provided with a water filling hole and an exhaust valve (C70), the water filling hole is threadedly connected with a water filling cover (C69), and the bottom of the tank body is provided with a drain valve (C62).

6. The device for measuring the refrigerating capacity of a water chiller according to claim 5, wherein, The water tank cover (C61) is provided with a liquid level switch (C68), and the height of the liquid level switch (C68) in the test water tank is higher than that of the second tower joint (C67).

7. The device for measuring the refrigerating capacity of a water chiller according to claim 1, wherein, The test water tank (C6) is wrapped with a heat preservation sponge (C71), and the test water tank (C6) is provided with a castor wheel (C63) at the bottom.

8. The device for measuring refrigerating capacity of a water chiller according to claim 1, wherein, The test water tank (C6) is provided with a first temperature sensor (C64) near the water inlet of the single-pass serpentine flow channel, and a second temperature sensor (C66) near the water outlet of the single-pass serpentine flow channel.

9. A method for measuring the refrigerating capacity of a water chiller, using the water chiller refrigerating capacity measuring device of claim 1, characterized in that, The method comprises the following steps: When the set temperature of the water cooler (B) is lower than the normal temperature of the water in the test water tank (C6), the refrigeration capacity of the water cooler (B) is: Q 冷 = C p * p 水 * V * (T2 - T1) / t When the set temperature of the water cooler (B) is higher than the normal temperature of the water in the test water tank (C6), the heating capacity of the water cooler (B) is: Q 冷 = C p * p 水 * V * (T1 - T2) / t where C p is the specific heat of water at constant pressure: 4.2 kJ / kg°C; p 水 is the density of water: 1000 kg / m 3 ; V is the total water volume, in m 3 ; t is time, in s; T1 is the water inlet temperature, in °C; and T2 is the water outlet temperature, in °C.

Images