A non-circulating water tank temperature control device for a refrigeration system

Abstract

This utility model discloses a tankless temperature control device for refrigeration systems, belonging to the field of refrigeration temperature control technology. The device includes a main refrigeration circuit and a fluid temperature control circuit. Its main innovation lies in eliminating the water tank involved in circulation in the fluid temperature control circuit and replacing the traditional three-way proportional valve with an electric ball valve group consisting of electric straight-through ball valve one, electric straight-through ball valve two, electric ball valve one, and electric ball valve two. The heating and cooling flow paths are switched by controlling the on / off state of electric straight-through ball valves one and two, and the flow rate is precisely adjusted through the cooperation of the parallel electric ball valves one and two. This utility model solves the problems of high cost, slow temperature control response, and insufficient accuracy in existing technologies, and has the advantages of compact structure, low cost, fast and accurate temperature control, and good low-temperature resistance.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration and temperature control technology, specifically to a tankless temperature control device for refrigeration systems. Background Technology

[0002] In existing refrigeration systems, temperature control is typically achieved using a structure with an internal circulating water tank and a three-way proportional valve. This traditional approach has the following drawbacks: 1) The three-way proportional valve itself is expensive, and its low-temperature resistance is limited (usually only -20℃), restricting the system's application in low-temperature environments; 2) The presence of the circulating water tank results in a large system water capacity and high thermal inertia, leading to slow heating and cooling rates and sluggish response; 3) The flow control accuracy of the three-way proportional valve is limited, making it difficult to meet the requirements of high-precision temperature control applications; 4) Additional components such as an external circulation pump are required, increasing the system's complexity and space requirements.

[0003] Therefore, there is an urgent need for a solution that is lower in cost, faster in temperature control, more accurate, and simpler in structure. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a tankless temperature control device for refrigeration systems. This device uses an electric ball valve instead of a three-way proportional valve and eliminates the water storage tank in the main circulation loop, thereby achieving low cost, high precision and fast temperature response.

[0005] Therefore, this utility model proposes a tankless temperature control device for a refrigeration system, comprising a main refrigeration circuit consisting of a compressor, condenser, expansion valve, and evaporator, and a fluid temperature control circuit; characterized in that: The fluid temperature control circuit does not include a water storage tank that participates in the cooling or heating cycle; the fluid temperature control circuit includes an external circulation pump, a PTC pipeline heater, a flow meter, and an electric ball valve assembly; the electric ball valve assembly includes an electric straight-through ball valve one, an electric straight-through ball valve two, an electric ball valve one, and an electric ball valve two. One end of the fluid temperature control circuit of the evaporator is connected to the inlet of the load under test via the first electric straight-through ball valve and the external circulation pump in sequence. The outlet of the load under test is connected to the other end of the fluid temperature control circuit of the evaporator via the second electric ball valve and the PTC pipeline heater in sequence. The first electric ball valve and the second electric ball valve are connected in parallel. The second electric straight-through ball valve is connected in parallel with the series branch formed by the first electric straight-through ball valve and the external circulation pump.

[0006] The device is configured such that: when cooling is required, the first electric straight-through ball valve is opened and the second electric straight-through ball valve is closed, allowing the medium to flow through the evaporator for cooling; when heating is required, the first electric straight-through ball valve is closed and the second electric straight-through ball valve is opened, allowing the medium to flow through the PTC pipeline heater for heating; and by adjusting the opening degrees of the first and second electric ball valves, and in conjunction with the feedback from the flow meter, the flow rate of the fluid temperature control circuit is controlled.

[0007] As a preferred technical solution of this application, it also includes a replenishing water tank, which is connected in parallel to the fluid temperature control circuit through a pipeline and a solenoid valve, and is only used to replenish liquid to the system, and does not participate in the cooling or heating process of the main circulation.

[0008] As a preferred technical solution of this application, the electric ball valve in the electric ball valve assembly has a temperature resistance range of -40℃ to 150℃.

[0009] As a preferred technical solution of this application, by controlling the opening degree of the electric ball valve one and the electric ball valve two, the flow control accuracy of the fluid temperature control circuit can be maintained at ±0.2L / min.

[0010] As a preferred technical solution of this application, a Y-shaped filter is also provided on the pipeline between the outlet of the load under test and the electric ball valve.

[0011] As a preferred technical solution of this application, a differential pressure regulating valve is also provided on the pipeline between the external circulation pump and the load under test.

[0012] The tankless temperature control device for refrigeration systems provided by this utility model has the following beneficial effects.

[0013] 1. Replacing the expensive three-way proportional valve with a lower-cost electric ball valve, and simplifying the system by eliminating the need for an external circulation pump, significantly reduces overall manufacturing costs. 2. By using the proportional opening control of the electric ball valve in conjunction with a flow meter, a flow control accuracy of up to ±0.2 L / min is achieved, ensuring extremely high temperature control stability. 3. By eliminating the water tank in the main circulation loop, the system has a small water capacity and low thermal inertia. Combined with direct heating / cooling in the pipeline, rapid heating and cooling of the system is achieved. 4. The selected electric ball valve has a wider temperature range than the three-way proportional valve, broadening the application range of the device in low-temperature environments. 5. The tankless design simplifies the system structure, reduces space requirements, and increases integration.

[0014] In addition to the purposes, features, and advantages described above, this application has other purposes, features, and advantages. A further detailed description of this application will be provided below with reference to the figures. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the tankless temperature control device for a refrigeration system according to the present invention. Figure 2 This is a schematic diagram of the structure of a temperature control device in a refrigeration system using existing technology. Explanation of reference numerals in the attached diagram: 1. Three-way proportional valve; 2. Evaporator; 3. Internal circulation pump; 4. External circulation pump; 5. Flow meter; 6. Pipeline heater; 7. Make-up water storage tank; 8. Circulating water tank; 9. Electric ball valve one; 10. Electric ball valve two; 11. Electric straight-through ball valve one; 12. Electric straight-through ball valve two. Detailed Implementation

[0016] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0017] like Figure 1 As shown, the present invention provides a tankless temperature control device for a refrigeration system, comprising: a main refrigeration circuit consisting of a compressor, an evaporator 2, a condenser, and an expansion valve; and a fluid temperature control circuit consisting of an external circulation pump, a PTC pipe heater 6, a flow meter 5, a solenoid valve, and an electric ball valve assembly.

[0018] Specifically, one end of the fluid temperature control loop on evaporator 2 is connected to the load under test via an electric straight-through ball valve 11, an external circulation pump 4, a differential pressure regulating valve, and a return ball valve. The other end of the load under test is connected to the other end of the fluid temperature control loop on evaporator 2 via an outlet ball valve, a Y-type filter, an electric ball valve 10, and a PTC pipeline heater 6. Electric ball valve 9 and electric straight-through ball valve 12 are connected in parallel on the inlet and outlet branches of the PTC pipeline heater 6; electric ball valve 9 is connected in parallel at the position of electric ball valve 10, and electric straight-through ball valve 12 is connected in parallel at the position of electric straight-through ball valve 11. Furthermore, a replenishment water tank 7 is connected in parallel on the fluid temperature control loop, and the flow rate is controlled by multiple electric straight-through ball valves.

[0019] In this embodiment, the fluid temperature control circuit is primarily driven by the external circulation pump 4. During the cooling cycle, after the medium is cooled by the evaporator 2, the flow path is controlled by the opening of the electric straight-through ball valve 11 and the closing of the electric straight-through ball valve 12. During the heating cycle, after the medium is heated by the PTC pipeline heater 6, the flow path is controlled by the opening of the electric straight-through ball valve 12 and the closing of the electric straight-through ball valve 11. Throughout the process, the system controller receives signals from the flow meter 5 and dynamically and precisely adjusts the flow rate of the medium flowing towards the load by precisely controlling the opening of the two electric ball valves, electric ball valve 9 and electric ball valve 10, ensuring that the flow rate remains stable at the set value with a deviation not exceeding ±0.2 L / min.

[0020] The electric ball valve is preferably a model with a temperature resistance range of -40℃ to 150℃ to ensure reliable operation in a wide temperature range. The replenishment water tank is connected to the main circuit via a solenoid valve and only replenishes the system when the pressure or liquid level is too low; it does not participate in the main circulation.

[0021] like Figure 2 As shown, in the prior art, a circulating water tank 8 and an internal circulation pump 3 are installed on the fluid temperature control circuit, and the circuit is connected to both ends of the evaporator 2; at the same time, a three-way proportional valve 1 is installed on the liquid outlet branch of the fluid temperature control circuit, and the third end of the three-way proportional valve 1 is connected to the liquid inlet branch through a pipe to control the flow rate of the fluid temperature control circuit.

[0022] The working principle of the tankless temperature control device for refrigeration systems of this invention is as follows.

[0023] Cooling Mode: When the system requires cooling, the controller opens the electric straight-through ball valve 11 while simultaneously closing the electric straight-through ball valve 12. The refrigeration system starts, and the cooling medium, after being cooled by the evaporator, flows to the load through the open electric straight-through ball valve 11. At this time, by adjusting the opening ratio of electric ball valves 9 and 10, and combining this with feedback from the flow meter, the flow rate of the cooling medium can be precisely controlled with an accuracy of ±0.2 L / min, achieving rapid and precise cooling.

[0024] Heating Mode: When the system requires heating, the controller opens the electric straight-through ball valve 2 (12) while simultaneously closing the electric straight-through ball valve 1 (11). The PTC pipeline heater starts, and the cooling medium, after being heated by the heater, flows to the load through the open electric straight-through ball valve 2 (12). Similarly, by adjusting the opening of electric ball valves 1 (9) and 2 (10), the flow rate of the heating medium can be precisely controlled, achieving rapid and accurate heating.

[0025] The innovation of this utility model's tankless temperature control device for refrigeration systems lies in its...

[0026] 1. No main circulating water tank design: The fluid temperature control loop does not include a water storage tank for participating in the cooling or heating cycle. The system can only be configured with one external water storage tank for replenishing the system; this tank is only used to replenish the system and does not participate in the main circulation.

[0027] 2. Electric ball valves replace three-way proportional valves: The system uses multiple electric ball valves to replace traditional three-way proportional valves for precise control of flow path switching and flow distribution. Specifically, this includes electric straight-through ball valve 11 and electric straight-through ball valve 22 for main flow on / off control, and electric ball valve 9 and electric ball valve 20 for fine adjustment of branch flow.

[0028] 3. PTC heating method: Rapid heating is achieved by using a PTC pipeline heater integrated into the pipeline.

[0029] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A tankless temperature control device for a refrigeration system, characterized in that, It includes a main refrigeration circuit consisting of a compressor, a condenser, an expansion valve, and an evaporator (2) connected together, as well as a fluid temperature control circuit; characterized in that: The fluid temperature control circuit does not include a water storage tank that participates in the cooling or heating cycle; the fluid temperature control circuit includes an external circulation pump (4), a PTC pipeline heater (6), a flow meter (5), and an electric ball valve assembly; the electric ball valve assembly includes an electric straight-through ball valve one (11), an electric straight-through ball valve two (12), an electric ball valve one (9), and an electric ball valve two (10). One end of the fluid temperature control circuit side of the evaporator (2) is connected to the inlet of the load under test via the electric straight-through ball valve one (11) and the external circulation pump (4) in sequence. The outlet of the load under test is connected to the other end of the fluid temperature control circuit side of the evaporator (2) via the electric ball valve two (10) and the PTC pipeline heater (6) in sequence. The electric ball valve one (9) is connected in parallel with the electric ball valve two (10). The electric straight-through ball valve two (12) is connected in parallel with the series branch formed by the electric straight-through ball valve one (11) and the external circulation pump (4).

2. The tankless temperature control device for a refrigeration system according to claim 1, characterized in that, It also includes a replenishment water tank (7), which is connected to the fluid temperature control circuit through a pipeline and a solenoid valve.

3. The tankless temperature control device for a refrigeration system according to claim 1, characterized in that, The electric ball valve in the electric ball valve assembly is a ball valve with a temperature resistance range of -40℃ to 150℃.

4. The tankless temperature control device for a refrigeration system according to claim 1, characterized in that, A Y-shaped filter is also installed on the pipeline between the outlet of the load under test and the electric ball valve (10).

5. The tankless temperature control device for a refrigeration system according to claim 1, characterized in that, A differential pressure regulating valve is also installed on the pipeline between the external circulation pump (4) and the load being measured.

Images