阅读说明：本技术 一种单压缩机多温冷水系统 (Single compressor multiple temperature cold water system ) 是由 庄瑞斌 陈育平 宰广平 杨春阳 屠鹏 于 2019-10-11 设计创作，主要内容包括：一种单压缩机多温冷水系统。涉及一种工业水冷冷水机组系统,尤其涉及多温度梯度应用环境的多温型冷水机系统。提供了一种利用单台机组,输出多级稳定的温度梯度,进而实现高能率应用的一种单压缩机多温水冷系统。包括制冷剂循环回路、冷水回路和控制器,所述制冷剂循环回路包括压缩机、冷凝器、节流阀和蒸发器；所述冷水回路包括水箱、水泵、至少二个温度用户区以及连接所述水箱、水泵和温度用户区的管路,与所述压缩机连接有变频电路；所述变频电路连接所述控制器。本发明全面地实现精确热交换的同时,充分满足节能的要求。(A single compressor multi-temperature cold water system. Relates to an industrial water-cooling chiller system, in particular to a multi-temperature chiller system in a multi-temperature gradient application environment. The single-compressor multi-temperature water cooling system is used for outputting multi-stage stable temperature gradients by using a single unit so as to realize high energy rate application. The system comprises a refrigerant circulation loop, a cold water loop and a controller, wherein the refrigerant circulation loop comprises a compressor, a condenser, a throttle valve and an evaporator; the cold water loop comprises a water tank, a water pump, at least two temperature user areas and pipelines for connecting the water tank, the water pump and the temperature user areas, and a frequency conversion circuit is connected with the compressor; the frequency conversion circuit is connected with the controller. The invention fully realizes accurate heat exchange and simultaneously fully meets the requirement of energy conservation.)

1. A single compressor multi-temperature cold water system comprises a refrigerant circulation loop, a cold water loop and a controller, wherein the refrigerant circulation loop comprises a compressor, a condenser, a throttle valve and an evaporator; the cold water loop comprises a water tank, a water pump, at least two temperature user areas and a pipeline connecting the water tank, the water pump and the temperature user areas, and is characterized in that,

the water outlet of the water pump comprises a main water outlet and compensation water outlets which are connected with the first temperature user area and then are connected with the temperature user areas; the main water outlet is communicated with a first water inlet of the first temperature user area through the evaporator, and a temperature sensor TA1 is arranged at the first water inlet; the water outlet of the first temperature user area is provided with an electric regulating valve A2F and a temperature sensor TA2, wherein the electric regulating valve A2F is used for controlling the outlet water temperature of the first temperature user area;

the outlet of the electric three-way regulating valve A2F is connected with a main inlet of an electric three-way regulating valve B1F, wherein the electric three-way regulating valve B1F is used for controlling the water inlet temperature of a second temperature user area, the electric three-way regulating valve B1F is also provided with an auxiliary inlet and an outlet, the auxiliary inlet of the electric three-way regulating valve B1F is connected with the compensation water gap, and the outlet of the electric three-way regulating valve B1F is connected with the water inlet of the second temperature user area;

a water inlet of the second temperature user area is provided with a temperature sensor TB1, a water outlet of the second temperature user area is provided with a temperature sensor TB2, and a water outlet of the second temperature area is connected with the water tank;

the water pump, the temperature sensor TA1, the temperature sensor TA2, the electric regulating valve A2F, the electric three-way regulating valve B1F, the temperature sensor TB1 and the temperature sensor TB2 are respectively connected with the controller.

2. The single-compressor multi-temperature cold water system according to claim 1, further comprising a second temperature zone bypass circuit, said bypass circuit comprising an electric three-way regulating valve B2F for controlling the temperature of the outlet water of the second temperature user zone, said electric three-way regulating valve B2F comprising an inlet, an auxiliary outlet and an outlet, said electric three-way regulating valve B2F having its inlet connected to the outlet of said electric three-way regulating valve B1F, said electric three-way regulating valve B2F having its outlet connected to the inlet of said second temperature user zone, said electric three-way regulating valve B2F having its auxiliary outlet connected to the outlet of said second temperature zone; the electric three-way regulating valve B2F is connected with the controller.

3. The single-compressor multi-temperature cold water system as claimed in claim 1 or 2, wherein an Nth temperature user area is further provided, and a temperature sensor TN1 and an electric three-way regulating valve N1F are arranged at a water inlet of the Nth temperature user area; the electric three-way regulating valve N1F comprises a main inlet, an auxiliary inlet and an outlet, wherein the inlet of the electric three-way regulating valve N1F is connected with the outlet of the electric three-way regulating valve which is connected in front, the auxiliary inlet is connected with the compensation water gap, and the outlet is connected with the water inlet of the Nth temperature user area; the water outlet of the Nth temperature user area is connected with the water tank; a water outlet of the Nth temperature user area is provided with a temperature sensor TN 2; the temperature sensor TN1, the temperature sensor TN2 and the electric three-way regulating valve N1F are respectively connected with the controller.

4. The single-compressor multi-temperature cold water system according to claim 3, further comprising an N temperature zone bypass circuit, wherein said bypass circuit comprises an electric three-way regulating valve N2F, said electric three-way regulating valve N2F comprises an inlet, an auxiliary outlet and an outlet, said electric three-way regulating valve N2F has an inlet connected to said electric three-way regulating valve N1F, said electric three-way regulating valve N2F has an outlet connected to said water inlet of said N temperature user zone, and said electric three-way regulating valve N2F has an auxiliary outlet connected to said water outlet of said N temperature zone; the electric three-way regulating valve N2F is connected with the controller.

5. The single-compressor multi-temperature cold water system according to claim 1, wherein an inverter circuit is connected to the compressor; the frequency conversion circuit is connected with the controller.

Technical Field

The invention relates to an industrial water-cooling chiller system, in particular to a multi-temperature chiller system in a multi-temperature gradient application environment.

Background

Due to the complex application environment of the industrial water chilling unit, a set of refrigeration system is usually set up, and then the refrigeration system is connected with a cold water medium in a cold water loop to reduce the temperature of the cold water medium and perform targeted temperature control on each device and part of the industrial equipment. The existing water chilling unit generally sets up a set of independent cold water loop aiming at a temperature user output point, namely, a single machine single temperature form is more. If the output temperature user point is increased, a cold water loop formed by a corresponding independent water tank, a water pump and the like is required to be additionally added. So that the application efficiency is low and the structure of the cold water loop is complex. In the prior art

Name: a double-loop water chilling unit and a double-temperature cooling system have the following application numbers: 201710267267.0, filing date: 2017-04-21, which discloses a dual-loop water chilling unit and a dual-temperature cooling system, and is used for equipment cooling, the dual-loop water chilling unit comprises a water tank and a compression refrigeration cycle loop which connects a compressor, an evaporator, a condenser and a throttle valve through pipelines, the water tank is divided into a main water tank and an auxiliary water tank, the evaporator is positioned in the main water tank, the main water tank is externally connected with a low-temperature water circulation supply loop, the auxiliary water tank is externally connected with a high-temperature water circulation supply loop, a water outlet pipeline of the low-temperature water circulation supply loop is connected with a temperature compensation pipeline leading to the auxiliary water tank, a temperature sensor is arranged in the auxiliary water tank, and a control valve which is connected with a temperature sensor signal is arranged on. The water tank is divided into a main water tank and an auxiliary water tank, the two water tanks are respectively connected with two circulating water loops, the auxiliary water tank is provided with a temperature sensor, when the temperature of the auxiliary water tank is overhigh, a control valve is controlled to be opened, and low-temperature output water is input into the auxiliary water tank through a temperature compensation pipeline to cool high-temperature circulating water.

Under another name: a dual-temperature dual-compressor water chilling unit and a refrigeration control method thereof are disclosed in the application number: 201611122688.6, filing date: 2016-12-08, provides a double-temperature double-compressor water chilling unit and a refrigeration control method thereof, belonging to the technical field of air conditioning equipment. The high-temperature shell-and-tube heat exchange device is in two-way communication with a high-temperature compression refrigeration loop positioned on the outer side of the unit shell, the low-temperature shell-and-tube heat exchange device is in two-way communication with a refrigerant circulation loop positioned on the outer side of the unit shell, the refrigerant circulation loop and the high-temperature compression refrigeration loop are both connected with a control module, and the switching structure is connected with the control module. The invention has the advantages of low investment cost, high heat exchange efficiency and the like.

Generally speaking, the prior art has no proper technical means for outputting a plurality of service temperatures of temperature gradients by using one unit.

Disclosure of Invention

Aiming at the technical problems, the invention provides a single-compressor multi-temperature water cooling system which utilizes a single unit to output multi-stage stable temperature gradients so as to realize high energy rate application.

The technical scheme of the invention is as follows: the system comprises a refrigerant circulation loop, a cold water loop and a controller, wherein the refrigerant circulation loop comprises a compressor, a condenser, a throttle valve and an evaporator; the cold water loop comprises a water tank, a water pump, at least two temperature user areas and pipelines for connecting the water tank, the water pump and the temperature user areas,

the water outlet of the water pump comprises a main water outlet and compensation water outlets which are connected with the first temperature user area and then are connected with the temperature user areas; the main water outlet is communicated with a first water inlet of the first temperature user area through the evaporator, and a temperature sensor TA1 is arranged at the first water inlet; the water outlet of the first temperature user area is provided with an electric regulating valve A2F and a temperature sensor TA2, wherein the electric regulating valve A2F is used for controlling the outlet water temperature of the first temperature user area;

the outlet of the electric three-way regulating valve A2F is connected with a main inlet of an electric three-way regulating valve B1F, wherein the electric three-way regulating valve B1F is used for controlling the water inlet temperature of a second temperature user area, the electric three-way regulating valve B1F is also provided with an auxiliary inlet and an outlet, the auxiliary inlet of the electric three-way regulating valve B1F is connected with the compensation water gap, and the outlet of the electric three-way regulating valve B1F is connected with the water inlet of the second temperature user area;

a water inlet of the second temperature user area is provided with a temperature sensor TB1, a water outlet of the second temperature user area is provided with a temperature sensor TB2, and a water outlet of the second temperature area is connected with the water tank;

the water pump, the temperature sensor TA1, the temperature sensor TA2, the electric regulating valve A2F, the electric three-way regulating valve B1F, the temperature sensor TB1 and the temperature sensor TB2 are respectively connected with the controller.

The water-saving control system further comprises a second temperature zone bypass loop, wherein the bypass loop comprises an electric three-way regulating valve B2F used for controlling the water outlet temperature of a second temperature user zone, the electric three-way regulating valve B2F comprises an inlet, an auxiliary outlet and an outlet, the inlet of the electric three-way regulating valve B2F is connected with the outlet of the electric three-way regulating valve B1F, the outlet of the electric three-way regulating valve B2F is connected with the water inlet of the second temperature user zone, and the auxiliary outlet of the electric three-way regulating valve B2F is connected with the water outlet of the second temperature zone; the electric three-way regulating valve B2F is connected with the controller.

The water inlet of the Nth temperature user area is provided with a temperature sensor TN1 and an electric three-way regulating valve N1F; the electric three-way regulating valve N1F comprises a main inlet, an auxiliary inlet and an outlet, wherein the inlet of the electric three-way regulating valve N1F is connected with the outlet of the electric three-way regulating valve which is connected in front, the auxiliary inlet is connected with the compensation water gap, and the outlet is connected with the water inlet of the Nth temperature user area; the water outlet of the Nth temperature user area is connected with the water tank; a water outlet of the Nth temperature user area is provided with a temperature sensor TN 2; the temperature sensor TN1, the temperature sensor TN2 and the electric three-way regulating valve N1F are respectively connected with the controller.

The temperature control system further comprises an Nth temperature zone bypass loop, wherein the bypass loop comprises an electric three-way regulating valve N2F, the electric three-way regulating valve N2F comprises an inlet, an auxiliary outlet and an outlet, the inlet of the electric three-way regulating valve N2F is connected with the outlet of the electric three-way regulating valve N1F, the outlet of the electric three-way regulating valve N2F is connected with the water inlet of the Nth temperature user zone, and the auxiliary outlet of the electric three-way regulating valve N2F is connected with the water outlet of the Nth temperature zone; the electric three-way regulating valve N2F is connected with the controller.

The compressor is connected with a frequency conversion circuit; the frequency conversion circuit is connected with the controller.

The water cooler of the invention adopts a group of water tank and water pump, and a main water outlet (used for exchanging heat with the evaporator) and a compensation water outlet (consistent with the water temperature in the water tank) are arranged at the outlet of the water pump. The working conditions of the temperature areas are monitored in real time by collecting the inlet and outlet temperatures of the temperature user areas. Once the temperature is inconsistent with the set temperature, the automatic adjustment of the system can be realized, and the condition that the running state of each link node of the system is consistent with the set state is met. The technical scheme of the invention is different from the prior art that the inlet temperature is mainly controlled around, but the inlet temperature and the outlet temperature are controlled, the constancy of the inlet temperature and the outlet temperature is maintained, the inlet temperature is controlled by using a frequency conversion technology in a first temperature area, the outlet temperature is controlled by using a regulating valve, the inlet temperature is controlled by using a water mixing valve (namely a three-way valve) in a second temperature area (and a subsequent temperature area), and the outlet temperature is controlled by using a water dividing valve, so that the energy-saving requirement is fully met while the accurate heat exchange is comprehensively realized.

Drawings

Figure 1 is a schematic view of the structure of the present invention,

figure 2 is a schematic structural diagram of a preferred embodiment of the present invention,

figure 3 is a schematic diagram of the operation of the present invention,

in the figure 1 there is shown a refrigerant circulation circuit,

11 is a compressor, 111 is an inverter circuit, 12 is a condenser, 13 is an evaporator, 14 is a throttle valve

2 is a cold water circuit which is connected with a cold water circuit,

21 is a user in temperature zone A, 211 is a temperature sensor TA1, 212 is a temperature sensor TA2, 213 is an electric control valve A2F;

22 is a user in temperature zone B, 221 is a temperature sensor TB1, 222 is a temperature sensor TB2, 223 is an electric three-way regulating valve B1F, 224 is an electric three-way regulating valve B2F,

23 is a water tank, 24 is a water pump;

in the figure, the dotted line is an action relation line, and the solid line is a circulation path of the refrigeration medium and the heat exchange medium.

Detailed Description

The single-compressor multi-temperature cold water system and the control method thereof according to the present invention are further described with reference to fig. 1-3, wherein the single-compressor multi-temperature cold water system comprises a refrigerant circulation circuit 1, a cold water circuit 2 and a controller, the refrigerant circulation circuit 1 comprises a compressor 11, a condenser 12, a throttle valve 14 and an evaporator 13; the cold water circuit 2 comprises a water tank 23, a water pump 24, at least two temperature user zones and a pipe connecting the water tank 23, the water pump 24 and the temperature user zones,

an inverter circuit 111 connected to the compressor 11; the frequency conversion circuit 111 is connected with the controller. The system is used for controlling the working frequency of the compressor 11 so as to control the inlet water temperature of the first temperature user area to meet the set requirement;

the controller adjusts the water flow of the water medium in the cold water loop 2 by collecting the information feedback of the temperature sensor and sending instructions to the frequency conversion circuit 111 and each electric regulating valve;

the water outlet of the water pump 24 comprises a main water outlet and compensation water outlets which are connected with the first temperature user areas and then are connected with the temperature user areas; the main water outlet is communicated with a first water inlet of the first temperature user area through the evaporator 13, and a temperature sensor TA1211 is arranged at the first water inlet and is used for acquiring the temperature of the first temperature area at the water inlet; the water outlet of the first temperature user area is provided with an electric regulating valve A2F213 and a temperature sensor TA 2212; the temperature sensor TA2212 is used for acquiring the temperature of the water outlet of the first temperature area; the electric regulating valve A2F213 is used for regulating the flow of the water outlet of the first temperature area so as to control the water outlet temperature of the first temperature area;

the outlet of the electric three-way regulating valve A2F213 is connected with the main inlet of the electric three-way regulating valve B1F223, the electric three-way regulating valve B1F223 is also provided with an auxiliary inlet and an outlet, the auxiliary inlet of the electric three-way regulating valve B1F223 is connected with the compensation water port, and the outlet of the electric three-way regulating valve B1F223 is connected with the water inlet of the second temperature user area;

a temperature sensor TB1221 is arranged at the water inlet of the second temperature user area, and the temperature sensor TB1221 is used for acquiring the temperature at the water inlet of the second temperature area; a temperature sensor TB2222 is arranged at the water outlet of the second temperature user area and used for acquiring the temperature at the water outlet of the second temperature area; the water outlet of the second temperature area is connected with the water tank;

the water pump 24, the temperature sensor TA1211, the temperature sensor TA2212, the electric regulating valve A2F213, the electric three-way regulating valve B1F223, the temperature sensor TB1221 and the temperature sensor TB2222 are respectively connected with the controller. In view of the fact that such control techniques are relatively mature, the present disclosure is not repeated, and those skilled in the art can fully implement the technical solutions of the present disclosure in the conception, the objective task, and the planning. The controller is not shown in the drawings, but the interaction relationship among some executing components, collecting components and the like is marked in the drawings.

The low-temperature return circuit comprises an electric three-way regulating valve B2F224, the electric three-way regulating valve B2F224 comprises an inlet, an auxiliary inlet and an outlet, the inlet of the electric three-way regulating valve B2F is connected with the outlet of the electric three-way regulating valve B1F223, the outlet of the electric three-way regulating valve B2F224 is connected with the water inlet of the second temperature user area, and the auxiliary inlet of the electric three-way regulating valve B2F224 is connected with the water outlet of the second temperature area; the electric three-way regulating valve B2F224 is connected with the controller.

The water inlet of the Nth temperature user area is provided with a temperature sensor TN1 and an electric three-way regulating valve N1F; the electric three-way regulating valve N1F comprises a main inlet, an auxiliary inlet and an outlet, wherein the inlet of the electric three-way regulating valve N1F is connected with the outlet of the electric three-way regulating valve which is connected in front, the auxiliary inlet is connected with the compensation water gap, and the outlet is connected with the water inlet of the Nth temperature user area; the water outlet of the Nth temperature user area is connected with the water tank; a water outlet of the Nth temperature user area is provided with a temperature sensor TN 2; the temperature sensor TN1, the temperature sensor TN2 and the electric three-way regulating valve N1F are respectively connected with the controller.

The temperature control system further comprises an Nth temperature zone bypass loop, wherein the bypass loop comprises an electric three-way regulating valve N2F, the electric three-way regulating valve N2F comprises an inlet, an auxiliary outlet and an outlet, the inlet of the electric three-way regulating valve N2F is connected with the outlet of the electric three-way regulating valve N1F, the outlet of the electric three-way regulating valve N2F is connected with the water inlet of the Nth temperature user zone, and the auxiliary outlet of the electric three-way regulating valve N2F is connected with the water outlet of the Nth temperature zone; the electric three-way regulating valve N2F is connected with the controller.

The working principle of the invention is as follows:

firstly, in the cold water loop 2, the water medium is output from the water tank 23 by the water pump 24 and enters the evaporator 13 in the refrigeration cycle loop 1, and the refrigeration temperature in the evaporator 13 is jointly controlled and regulated by the frequency conversion circuit 111 and the compressor 11; after passing through the outlet of the evaporator 13, the water medium flows through a temperature sensor TA1211, and the temperature of the water medium at the moment, namely the water temperature of the water inlet of the temperature area A, is recorded; if the measured temperature of the aqueous medium is higher than the set value temperature, information is fed back to the refrigeration cycle loop 1, the working energy rate is adjusted, the refrigeration effect of the evaporator is enhanced, and if the measured temperature of the aqueous medium is lower than the set value temperature, the refrigeration effect of the evaporator is reduced, so that the temperature of the aqueous medium before entering a user in the temperature area A is controlled, and the temperature of the aqueous medium at the inlet of the first temperature user area is ensured to meet the set requirement;

then the aqueous medium flows out through an outlet of a user in the temperature area A21 and flows through a temperature sensor TA2212 and an electric control valve A2F213, the temperature sensor TA2212 records the temperature value of the aqueous medium at the water outlet of the user in the temperature area A, the electric control valve A2F213 is used for adjusting the flow rate of the aqueous medium of the user in the temperature area A, and the electric control valve A2F213 reasonably adjusts the flow rate of the aqueous medium through the temperature value of the aqueous medium fed back by the temperature sensor TA 2212; that is, if the temperature value of the aqueous medium measured by the temperature sensor TA2212 is greater than the set value, the information is fed back to the electric control valve A2F213 to increase the water flow rate of the aqueous medium in the cold water loop 2, and if the measured temperature value is less than the set value, the water flow rate of the aqueous medium in the cold water loop 2 is decreased, so that the temperature at the water outlet is adjusted and maintained to be constant; at the moment, the water medium enters the electric three-way regulating valve B1F233 through the electric regulating valve A2F213, the compensation water medium from the water pump 24 is also introduced into the electric three-way regulating valve B1F233, and the two water media with different temperatures are converged and flow out of the electric three-way regulating valve B1F233 to maintain the temperature of the water medium at the water inlet of the user in the temperature zone B constant; recording the temperature of the water medium at the position of a temperature sensor TB1221, namely the water temperature of a water inlet of a user in a B temperature zone; similarly, the temperature signal is fed back to the electric three-way regulating valve B1F223, and the temperature of the water inlet of the second temperature user area is kept constant by regulating the flow ratio of the two water flows with different temperatures;

the compensation aqueous medium of the water 24 passing through the electric regulating valve A2F213 simultaneously enters the electric three-way regulating valve B1F223 to be converged, the mixed aqueous medium enters the electric three-way regulating valve B2F224 from the outlet of the electric three-way regulating valve B1F223, enters the temperature zone B user 22 through the outlet part of the electric three-way regulating valve B2F224, and is partially directly output to the water tank 23; after the water medium flows out of the user 22 in the temperature zone B, the water medium passes through a temperature sensor TB2222, and the temperature sensor TB2222 records the water medium temperature value at the water outlet; if the recorded temperature value is lower than the set temperature value, the information is fed back to the electric three-way regulating valve B2F224 to reduce the flow of the water medium output to the user 22 in the B temperature area, and the flow of the water medium directly output back to the water supply tank 23 is improved, if the temperature value detected by the temperature sensor TB2222 is higher than the set value, the flow of the water medium output to the user 22 in the B temperature area is increased in the same manner, and the flow of the water medium directly output back to the water supply tank 23 is reduced; [A1]

finally, the water medium flows into the water tank 23 from the water outlet of the user 22 in the B temperature zone, so that the water medium is ensured to be recycled.

The specific embodiment of the nth user zone is the same as that of the B temperature zone 22. As shown in fig. 2. The compensation waterway is connected with the outlet of the water pump and is equivalent to a parallel connection relation with the compensation waterway of the second temperature user area.

For each temperature zone control, the following is summarized:

if the inlet temperature of the first temperature user area is lower, the working efficiency of the compressor 11 is reduced through the frequency conversion circuit 111 for solving the problem, otherwise, the working efficiency of the compressor 11 is increased;

if the temperature of the water outlet of the first temperature user area is lower, the opening degree of the electric control valve A2F213 is reduced, and the flow of the water medium at the user outlet of the first temperature area is reduced; conversely, the opening degree of the electric control valve A2F213 is increased;

if the temperature of the water inlet of the second temperature user area is lower, the flow rate of the aqueous medium from the compensation water inlet of the water pump 24 is increased by adjusting the electric three-way adjusting valve B1F223 [ A2]

If the temperature of the water outlet of the second temperature user area is lower, the flow of the water medium directly conveyed back to the water tank 23 is increased and the flow of the water medium input into the second temperature user area is reduced by adjusting the electric three-way adjusting valve B1F 224; otherwise, the same principle is applied.

The working principle of the Nth temperature user area is the same as that of the second temperature user area.

The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.

I consider B1F223 to be a two-in-one-out three-way valve and B2F224 to be a one-in-two-out three-way valve. B2F224 enters the B temperature zone and the water tank respectively, and only the water quantity of the two paths is regulated.

And the electric three-way regulating valve B1F223 increases the water quantity of the compensation water gap and reduces the water quantity regulation of the water outlet of the user in the temperature area A, and vice versa.