Positive-pressure anti-explosion totally-closed high and low temperature circulating device

Abstract

The utility model provides a positive pressure explosion-proof totally-enclosed high and low temperature circulating device, which comprises a positive pressure explosion-proof cabinet, a cabinet body support frame, an explosion-proof electric appliance box and a liquid level display, a liquid supply flange pipe orifice and a liquid return flange pipe orifice are arranged in the middle of one side of the positive pressure explosion-proof cabinet, a cooling water outlet and a cooling water inlet are arranged at the corner of one side of the positive pressure explosion-proof cabinet, and the liquid level display is arranged on the cabinet body support frame. According to the utility model, the expansion container is arranged, the expansion container is of a closed structure and is filled with the heat-conducting medium, and the temperature of the expansion container is controlled between 25 DEG C and 60 DEG C, so that the risk that the heat-conducting medium absorbs moisture and volatilizes during operation can be reduced; and therefore, the heat-conducting medium is prevented from deteriorating, and continuous temperature control of-60 DEG C to 200 DEG C can be realized under the condition of no need of replacement and no need of pressurization.

Description

Technical Field

[0001] The utility model belongs to the technical field of high and low temperature circulation, and relates to a positive pressure explosion-proof fully enclosed high and low temperature circulation device. Background Technique

[0002] A high and low temperature circulation device is a device that can provide a cold source and a heat source for circulation, with a wide working range, and is used in industries such as pharmaceuticals, chemicals, and biology to provide heat sources and cold sources for reaction kettles, tanks, etc., and can also be used for heating and cooling of other equipment. The high and low temperature circulation device is widely applicable to fields such as universities, environmental protection, biochemistry, medical treatment, chemical industry, and scientific research. The high and low temperature circulation device has the characteristics of reasonable structure, simple operation, and good stability. The high and low temperature circulation device is an ideal device for experimental pilot tests and laboratory technicians.

[0003] In the prior art, the heat transfer medium of high and low temperature circulation is easily oxidized and absorbs moisture in the air, resulting in the deterioration of the heat transfer medium and the need for replacement. Moreover, continuous temperature control from -60°C to 200°C can only be achieved under pressurization. Based on this, we designed a positive pressure explosion-proof fully enclosed high and low temperature circulation device. Summary of the Invention

[0004] The purpose of the utility model is to provide a positive pressure explosion-proof fully enclosed high and low temperature circulation device to solve the problems raised in the above background technique.

[0005] The purpose of the utility model can be achieved by the following technical solutions: A positive pressure explosion-proof fully enclosed high and low temperature circulation device includes a positive pressure explosion-proof cabinet, a cabinet support frame, an explosion-proof electrical box, and a liquid level display. A gas source interface is provided at the side wall of the right-angle groove on the front of the positive pressure explosion-proof cabinet. A touch operation panel and a power switch are provided at the top on the other side of the front of the positive pressure explosion-proof cabinet. A pressure gauge and an explosion-proof gauge are provided at the bottom on the other side of the front of the positive pressure explosion-proof cabinet. A liquid supply flange pipe opening and a liquid return flange pipe opening are provided in the middle of one side of the positive pressure explosion-proof cabinet. A cooling water outlet and a cooling water inlet are provided at the corner of one side of the positive pressure explosion-proof cabinet. The two liquid level endpoints of the liquid level display are arranged at the measurement port on one side of the positive pressure explosion-proof cabinet through a connecting flange;

[0006] A refrigeration heating temperature control system unit is arranged inside the positive pressure explosion-proof cabinet. The refrigeration heating temperature control system unit includes an evaporator, an intermediate heat exchanger, a refrigeration compressor, an oil separator, a condenser, a circulation pump, an expansion throttling mechanism, a carrier liquid tank, and a liquid storage tank. The process flow of the refrigeration heating temperature control system unit is as follows:

[0007] The refrigerant inside the liquid storage tank flows into the interior of the evaporator through a pipeline. The intermediate heat exchanger needs to be connected to the oil supply port and the oil return port of the reactor through the liquid supply flange pipe orifice and the liquid return flange pipe orifice. The refrigerant exchanges heat with the heat-conducting oil inside the intermediate heat exchanger. The temperature of the refrigerant rises and it changes from a liquid state to a gaseous state, and is sucked into the suction port of the refrigeration compressor. After being compressed by the refrigeration compressor, it becomes a high-temperature and high-pressure refrigerant gas. First, it passes through an oil separator to separate the refrigeration oil carried during the compression process completely, and then enters the condenser. The condenser is connected to the cooling water outlet and the cooling water inlet. After exchanging heat with the ambient air or the cooling water, it changes from a high-temperature and high-pressure gas to a high-pressure and normal-temperature liquid;

[0008] At this time, the high-pressure and normal-temperature refrigerant liquid inside the secondary refrigerant tank is depressurized through the expansion throttling mechanism through a pipeline, that is, it changes from a high-pressure liquid to a low-pressure liquid. The low-pressure liquid enters the evaporator, and the cooling capacity is brought to the evaporator through a circulation pump to achieve cycle refrigeration.

[0009] In the above positive-pressure explosion-proof fully enclosed high-low temperature circulation device, the refrigeration heating temperature control system unit further includes a drying filter. The drying filter is installed at the liquid outlet end of the secondary refrigerant tank and the drying filter is communicated with the liquid inlet end of the expansion throttling mechanism. The purpose of this setting is to filter the impurities of the secondary refrigerant and reduce the ice blockage phenomenon.

[0010] Among them, the drying filter also needs to be equipped with accessories structures such as a one-way throttle valve and an explosion-proof solenoid valve of the existing technology according to actual needs to facilitate better operation of the drying filter.

[0011] In the above positive-pressure explosion-proof fully enclosed high-low temperature circulation device, the expansion throttling mechanism consists of an expansion valve, a throttle valve and an expansion vessel. The expansion vessel is located between the expansion valve and the throttle valve and the expansion valve and the throttle valve are communicated with the expansion vessel. The expansion valve is connected to the drying filter. The purpose of this setting is to change the high-pressure and normal-temperature refrigerant liquid inside the secondary refrigerant tank into a low-pressure liquid, which is convenient to enter the evaporator, and the cooling capacity is brought to the circulation system through a circulation pump to achieve refrigeration.

[0012] In the above positive-pressure explosion-proof fully enclosed high-low temperature circulation device, the refrigeration heating temperature control system unit further includes an electrical control circuit. The refrigeration compressor, the circulation pump, the expansion valve and the throttle valve are all electrically connected to the touch operation panel through the electrical control circuit. The purpose of this setting is to have a good electrical control effect, which is convenient for better PLC electrical operation control and improves the convenience of use.

[0013] In the above positive pressure explosion-proof fully enclosed high and low temperature circulation device, the bottom end of the positive pressure explosion-proof cabinet is welded to the top end of the cabinet support frame, and the explosion-proof electrical box is installed at the right-angle groove on the front of the positive pressure explosion-proof cabinet through bolts. The purpose of this setting is to improve the overall positive pressure explosion-proof performance, and it is applicable to Zone 1 or Zone 2 hazardous locations where explosive gases of Group IIA, IIB, and IIC, T1-T4 groups exist or may exist in factories and enterprises.

[0014] The explosion-proof electrical box consists of two parts: an explosion-proof shell and a single-chip microcomputer control circuit board. The positive pressure explosion-proof cabinet is also connected to a positive pressure gas path control system, which consists of a ball valve, a filter pressure reducing valve, a one-way throttle valve, an explosion-proof solenoid valve, an exhaust pressure stabilizing valve, a stainless steel pipe, and a flow measurement and pressure measurement system, a total of eight parts.

[0015] Among them, the positive pressure principle is to match the intelligent single-chip microcomputer control system in the explosion-proof instrument box with the gas pressure control system, introduce clean and safe compressed air or inert gas into the positive pressure chamber, complete the purge of the flammable gas inside the positive pressure explosion-proof cabinet, and be able to maintain a certain pressure in the positive pressure chamber, so that a slightly positive pressure is formed in the positive pressure chamber to prevent the entry of external dangerous gases and achieve the purpose of explosion protection.

[0016] In the above positive pressure explosion-proof fully enclosed high and low temperature circulation device, an emptying pipe and a liquid adding pipe are arranged at the top of one side of the positive pressure explosion-proof cabinet, and the liquid adding pipe is connected to the liquid storage tank through a valve. The purpose of this setting is to facilitate better liquid addition and emptying of the liquid inside the liquid storage tank.

[0017] In the above positive pressure explosion-proof fully enclosed high and low temperature circulation device, the temperature of the expansion vessel is between 25° and 60°, the expansion vessel is a closed structure, and the inside of the expansion vessel is filled with a heat-conducting medium. The purpose of this setting is to reduce the risk of the heat-conducting medium absorbing moisture and volatilizing during operation.

[0018] In the above positive pressure explosion-proof fully enclosed high and low temperature circulation device, when the positive pressure value of the positive pressure explosion-proof cabinet is greater than 250 Pa, the positive pressure chamber of the positive pressure explosion-proof cabinet starts to automatically exhaust; when the positive pressure value of the positive pressure explosion-proof cabinet is less than 80 Pa and greater than 50 Pa, an alarm is prompted, and when the positive pressure value of the positive pressure explosion-proof cabinet is less than 50 Pa, the positive pressure explosion-proof cabinet automatically cuts off the power supply. The purpose of this setting is to have a good safety warning effect.

[0019] In the above positive pressure explosion-proof fully enclosed high and low temperature circulation device, a box body exhaust valve and a liquid discharge valve are arranged at the bottom of one side of the positive pressure explosion-proof cabinet, and a box body drain valve is arranged on one side of the cabinet support frame. The purpose of this setting is to facilitate better exhaust of the positive pressure explosion-proof cabinet and at the same time facilitate the discharge of the liquid remaining inside the positive pressure explosion-proof cabinet.

[0020] Compared with the prior art, the advantages of the positive pressure explosion-proof fully enclosed high and low temperature circulation device of the present utility model are as follows: By setting an expansion vessel, which is a closed structure and filled with a heat-conducting medium inside, and the temperature of the expansion vessel is controlled between 25°C and 60°C, the risk of the heat-conducting medium absorbing moisture and volatilizing during operation can be reduced, thereby avoiding the deterioration of the heat-conducting medium, eliminating the need for replacement, and enabling continuous temperature control from -60°C to 200°C without the need for pressurization. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 FIG. is a schematic three-dimensional structure diagram of a positive pressure explosion-proof fully enclosed high and low temperature circulation device of the present utility model.

[0022] Figure 2 FIG. is a flow chart of the refrigeration, heating and temperature control system unit of a positive pressure explosion-proof fully enclosed high and low temperature circulation device of the present utility model.

[0023] Figure 3 is a positive pressure explosion-proof fully enclosed high and low temperature circulation device of the present utility model Figure 1 FIG. is a schematic plan structure diagram.

[0024] Figure 4 FIG. is a schematic diagram showing the volume corresponding to the eight-position DIP switch setting on the circuit board of the present utility model and the positive pressure chamber.

[0025] Figure 5 FIG. is a schematic diagram showing the method of setting the volume corresponding to the eight-position DIP switch on the circuit board of the present utility model and the positive pressure chamber.

[0026] In the figure, 1. Positive pressure explosion-proof cabinet; 2. Cabinet support frame; 3. Explosion-proof electrical box; 4. Liquid level indicator; 5. Drain pipe; 6. Liquid filling pipe; 7. Liquid supply flange nozzle; 8. Return liquid flange nozzle; 9. Cooling water outlet; 10. Cooling water inlet; 11. Box exhaust valve; 12. Box drain valve; 13. Drain valve; 14. Power switch; 15. Pressure gauge; 16. Explosion-proof gauge; 17. Gas source interface; 18. Touch operation panel; 19. Evaporator; 20. Intermediate heat exchanger; 21. Refrigeration compressor; 22. Oil separator; 23. Condenser; 24. Circulation pump; 25. Expansion throttling mechanism; 26. Refrigerant tank; 27. Liquid storage tank. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following are specific embodiments of the present utility model in combination with the accompanying drawings to further describe the technical solutions of the present utility model, but the present utility model is not limited to these embodiments.

[0028] As Figure 1 , Figure 2 and Figure 3 shown, a positive pressure explosion-proof fully enclosed high and low temperature circulation device of the present utility model;

[0029] It includes a positive pressure explosion-proof cabinet 1. In the middle of one side of the positive pressure explosion-proof cabinet 1, there are a liquid supply flange pipe orifice 7 and a liquid return flange pipe orifice 8. At the corner of one side of the positive pressure explosion-proof cabinet 1, there are a cooling water outlet 9 and a cooling water inlet 10;

[0030] Inside the positive pressure explosion-proof cabinet 1, there is a refrigeration and heating temperature control system unit. The refrigeration and heating temperature control system unit includes an evaporator 19, an intermediate heat exchanger 20, a refrigeration compressor 21, an oil separator 22, a condenser 23, a circulation pump 24, an expansion throttling mechanism 25, a carrier fluid tank 26 and a liquid storage tank 27. The technological process of the refrigeration and heating temperature control system unit is as follows:

[0031] The refrigerant inside the liquid storage tank 27 flows into the inside of the evaporator 19 through a pipeline. The intermediate heat exchanger 20 needs to be connected to the oil supply port and the oil return port of the reaction kettle through the liquid supply flange pipe orifice 7 and the liquid return flange pipe orifice 8. The refrigerant exchanges heat with the heat-conducting oil inside the intermediate heat exchanger 20. The temperature of the refrigerant rises and changes from liquid to gas, and is sucked into the suction port of the refrigeration compressor 21. After being compressed by the refrigeration compressor 21, it becomes a high-temperature and high-pressure refrigerant gas. First, it passes through the oil separator 22 to separate the refrigeration oil carried during the compression process completely, and then enters the condenser 23. The condenser 23 is connected to the cooling water outlet 9 and the cooling water inlet 10. After exchanging heat with the ambient air or the cooling water, it changes from a high-temperature and high-pressure gas to a high-pressure and normal-temperature liquid; at this time, the high-pressure and normal-temperature refrigerant liquid inside the carrier fluid tank 26 is depressurized through the expansion throttling mechanism 25, that is, it changes from a high-pressure liquid to a low-pressure liquid. The low-pressure liquid enters the evaporator 19, and the cooling capacity is brought to the evaporator 19 through the circulation pump 24 to achieve cycle refrigeration.

[0032] Furthermore, the expansion throttling mechanism 25 consists of an expansion valve, a throttle valve and an expansion container. The expansion container is located between the expansion valve and the throttle valve and the expansion valve and the throttle valve are connected to the expansion container. The expansion valve is connected to a drying filter; the temperature of the expansion container is between 25° and 60°, the expansion container is of a closed structure and the inside of the expansion container is filled with a heat-conducting medium.

[0033] In the above refrigeration and heating temperature control system unit, the single-compressor refrigeration system can ensure the refrigeration reliability of the system at high temperatures, the components of the structure are simpler, and the failure rate is low. This structure is very helpful for the compressor lubricating oil system and greatly extends the service life of the system;

[0034] The circulation pump 24 adopts a fully enclosed magnetic pump for circulating stirring, with a uniform temperature field, no leakage at all, and at the same time meets the external circulation requirements; the integrated design of the sensor and the liquid flow of the circulation pump greatly improves the temperature control accuracy and the uniformity of the temperature field.

[0035] The model parameter of the refrigeration compressor 21 is Bitzer 6FE-44Y.

[0036] In this implementation scheme, the refrigeration heating temperature control system unit further includes a drying filter, which is installed at the liquid outlet end of the secondary refrigerant tank 26 and is connected to the liquid inlet end of the expansion throttling mechanism 25 to filter impurities in the secondary refrigerant and reduce the ice blockage phenomenon; the refrigeration heating temperature control system unit further includes an electrical control circuit, and the refrigeration compressor 21, the circulation pump 24, the expansion valve and the throttle valve are all electrically connected to the touch operation panel 18 through the electrical control circuit.

[0037] The bottom end of the positive pressure explosion-proof cabinet 1 is welded and set at the top end of the cabinet support frame 2. The explosion-proof electrical box 3 is installed at the right-angle groove on the front of the positive pressure explosion-proof cabinet 1 through bolts. An air source interface 17 is provided at the side wall of the right-angle groove on the front of the positive pressure explosion-proof cabinet 1 for introducing compressed air or inert gas, and it is required that the air source pressure is not less than 0.6 MPa; the explosion-proof electrical box 3 is composed of an explosion-proof shell and a single-chip microcomputer control circuit board. The positive pressure explosion-proof cabinet 1 is also connected with a positive pressure gas circuit control system, and the positive pressure gas circuit control system is composed of a ball valve, a filter pressure reducing valve, a one-way throttle valve, an explosion-proof solenoid valve, an exhaust pressure stabilizing valve, a stainless steel pipe and a flow measurement and pressure measurement system, a total of eight parts.

[0038] The positive pressure explosion-proof cabinet 1 adopts a positive pressure explosion-proof design and is applicable to the hazardous areas of Zone 1 or Zone 2 where explosive gases of Class IIA, Class IIB, and Class IIC, groups T1-T4, exist or may exist in factories and enterprises.

[0039] Among them, the positive pressure explosion-proof cabinet 1 is welded with cold-rolled steel plates or stainless steel plates with a thickness of 1.5-2.5 mm. The ventilation pipe is made of stainless steel pipe, and the incoming and outgoing cables use cable sealing joints. The following structural components also need to be set on the positive pressure explosion-proof cabinet 1 to facilitate better use and control:

[0040] An exhaust pipe 5 and a liquid adding pipe 6 are arranged at the top of one side of the positive pressure explosion-proof cabinet 1. The liquid adding pipe 6 is connected to the liquid storage tank 27 through a valve. A touch operation panel 18 and a power switch 14 are arranged at the top of the other side of the front of the positive pressure explosion-proof cabinet 1; the touch operation panel 18 adopts a 7-inch color touch screen, and the touch operation panel 18 integrates the VRF (refrigerant flow control) technology based on the PID+PWM principle.

[0041] A cabinet body exhaust valve 11 and a liquid discharge valve 13 are arranged at the bottom of one side of the positive pressure explosion-proof cabinet 1, and a cabinet body drain valve 12 is arranged on one side of the cabinet support frame 2; a pressure gauge 15 and an explosion-proof gauge 16 are arranged at the bottom of the other side of the front of the positive pressure explosion-proof cabinet 1. The two liquid level endpoints of the liquid level display 4 are set at the measurement port on one side of the positive pressure explosion-proof cabinet 1 through connecting flanges;

[0042] To consider the safety performance of the pressure value of the positive pressure explosion-proof cabinet 1, when the positive pressure value of the positive pressure explosion-proof cabinet 1 is greater than 250 Pa, the positive pressure chamber of the positive pressure explosion-proof cabinet 1 starts to exhaust automatically; when the positive pressure value of the positive pressure explosion-proof cabinet 1 is less than 80 Pa and greater than 50 Pa, an alarm is prompted, and when the positive pressure value of the positive pressure explosion-proof cabinet 1 is less than 50 Pa, the positive pressure explosion-proof cabinet 1 automatically cuts off the power supply.

[0043] Use and commissioning function of the positive pressure explosion-proof cabinet 1

[0044] This commissioning function can be used in a safe place or when it is determined that there is no explosive gas or dust present.

[0045] When using the commissioning function, it must be carried out under power. After power-on, first press the commissioning key, and at this time, "Important Notice" will be displayed on the screen, and confirm.

[0046] After the environment is safe, press the start key. At this time, the interlock contact changes from open to closed.

[0047] The power supply is connected, and the electrical equipment can be commissioned.

[0048] After the commissioning is completed, press the reset key to cancel the commissioning function.

[0049] If it is necessary to operate the positive pressure explosion-proof cabinet 1, press the start key to enter the normal ventilation process.

[0050] Volume setting of the positive pressure chamber of the positive pressure explosion-proof cabinet 1

[0051] The volume set by the 8-bit DIP switch on the circuit board should match the actual volume of the positive pressure chamber. The setting method is to change the up and down positions of the DIP switch. For details, please see Figure 4 .

[0052] The set volume should be ≥ the actual volume of the positive pressure chamber. An example can be seen in the attached drawing description Figure 5 .

[0053] Power supply for the positive pressure explosion-proof cabinet 1 and the explosion-proof electrical box 3: The equipment is powered by three-phase 380VAC 50HZ five-wire system. Please pay attention to distinguish the neutral line N and the grounding line PE. Generally, the wiring terminal markings are L1 - live wire, L2 - live wire, L3 - live wire, N - neutral line, PE - grounding line. (Pay attention to the phase sequence of the three-phase power supply. There is protection inside the equipment. If it is incorrect, swap the phase sequence. The equipment cannot be started if the wiring is incorrect).

[0054] The common operation modes of this technical solution are as follows:

[0055] A (constant value constant temperature test)

[0056] Operation is as follows: Power on → Log in → Operation settings → Change the "operation mode" to "constant value", and select the "oil supply temperature" mode for the "control method" → Directory → Monitoring screen → Set the corresponding temperature target value according to the test requirements → Run → Confirm.

[0057] After setting the fixed value mode for the first time, there is no need to reset it during the next fixed value operation. Just click "Start" directly after powering on and entering the "Monitoring Screen". If different test temperatures are required, the "Set Value" can be directly modified on the "Monitoring Screen".

[0058] Automatic shutdown and scheduled startup can be set for the set value operation.

[0059] On the operation setting screen, turn on "Fixed Value Timed Operation" and set the "Running Time" (unit: hours + minutes) to enable the machine to automatically shut down when the running time is up.

[0060] Select "Scheduled Setting" on the main screen and set the date and time point for the machine to automatically start up to enable the machine to start automatically when the time is up.

[0061] When using this function, there is usually no one on-site. Please pay special attention to the following situations:

[0062] 1. The medium liquid level is normal.

[0063] 2. The circulation pipeline is normal and there is no leakage.

[0064] 3. The machine starts automatically without affecting the peripheral connected containers.

[0065] B. Program operation mode: (According to the pre-set program, multi-point constant temperature or slope automatic control operation)

[0066] Operate the touch screen, compile multiple programs, and save them for later use. Each program can be set with up to 99 segments of content.

[0067] The operation is as follows: Power on → Main screen → Operation settings → Change the "Operation Mode" to "Program" → Directory → Main screen → Program settings → Program editing → Return → Main screen → Monitoring screen → Run → Confirm.

[0068] C. Control the "oil supply temperature" and run according to the slope

[0069] Main screen → Operation settings → Select "oil supply temperature" for the "Control Mode" and set the oil supply temperature slope. When the system is running, the set value changes with time (according to the set slope), and the control follows the slope change.

[0070] D. Program control runs according to the slope and controls the "oil supply temperature".

[0071] Main screen → Operation settings → Change the "Operation Mode" to "Program" and select "oil supply temperature" for the "Control Mode"

[0072] Return to the monitoring screen to run: → Directory → Main screen → Monitoring screen → Run → Confirm.

[0073] E. Operate with "material temperature" controlled.

[0074] The operation is as follows: Main screen → Operation settings → Change the "operation mode" to "fixed value", select "material temperature" for the "control mode" → Catalog → Monitoring screen → Set the corresponding temperature target value according to the test requirements → Run → Confirm.

[0075] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art. The specific embodiments described herein are merely illustrative of the spirit of the present utility model. Those skilled in the technical field to which the present utility model pertains may make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

Claims

1. A positive pressure explosion-proof fully enclosed high and low temperature circulation device, comprising a positive pressure explosion-proof cabinet (1), a cabinet body support frame (2), an explosion-proof electrical box (3) and a liquid level display (4), characterized in that, A gas source interface (17) is provided at the side wall of the right-angle groove on the front of the positive-pressure explosion-proof cabinet (1). A touch operation panel (18) and a power switch (14) are provided at the top on the other side of the front of the positive-pressure explosion-proof cabinet (1). A pressure gauge (15) and an explosion-proof gauge (16) are provided at the bottom on the other side of the front of the positive-pressure explosion-proof cabinet (1). A liquid supply flange nozzle (7) and a liquid return flange nozzle (8) are provided in the middle of one side of the positive-pressure explosion-proof cabinet (1). A cooling water outlet (9) and a cooling water inlet (10) are provided at the corner of one side of the positive-pressure explosion-proof cabinet (1). The two liquid level endpoints of the liquid level display (4) are arranged at the measurement port on one side of the positive-pressure explosion-proof cabinet (1) through connecting flanges; A refrigeration heating temperature control system unit is arranged inside the positive-pressure explosion-proof cabinet (1). The refrigeration heating temperature control system unit includes an evaporator (19), an intermediate heat exchanger (20), a refrigeration compressor (21), an oil separator (22), a condenser (23), a circulation pump (24), an expansion throttling mechanism (25), a coolant tank (26) and a liquid storage tank (27). The technological process of the refrigeration heating temperature control system unit is as follows: The refrigerant inside the liquid storage tank (27) flows into the inside of the evaporator (19) through a pipeline. The intermediate heat exchanger (20) needs to be connected to the oil supply port and the oil return port of the reaction kettle through the liquid supply flange nozzle (7) and the liquid return flange nozzle (8). The refrigerant exchanges heat with the heat-conducting oil inside the intermediate heat exchanger (20). The temperature of the refrigerant rises and changes from liquid to gas, and is sucked into the suction port of the refrigeration compressor (21). After being compressed by the refrigeration compressor (21), it becomes a high-temperature and high-pressure refrigerant gas. First, it passes through the oil separator (22) to separate the refrigeration oil carried during the compression process completely, and then enters the condenser (23). The condenser (23) is connected to the cooling water outlet (9) and the cooling water inlet (10). After exchanging heat with the ambient air or cooling water, it changes from a high-temperature and high-pressure gas to a high-pressure normal-temperature liquid; At this time, the high-pressure normal-temperature refrigerant liquid inside the coolant tank (26) is depressurized through the expansion throttling mechanism (25) through a pipeline, that is, it changes from a high-pressure liquid to a low-pressure liquid. The low-pressure liquid enters the evaporator (19), and the cooling capacity is brought to the evaporator (19) through the circulation pump (24) to realize cycle refrigeration.

2. The positive pressure explosion-proof fully enclosed high and low temperature circulation device according to claim 1, characterized in that, The refrigeration heating temperature control system unit further includes a dryer filter. The dryer filter is installed at the liquid outlet end of the coolant tank (26) and the dryer filter is communicated with the liquid inlet end of the expansion throttling mechanism (25) to realize the filtration of coolant impurities and reduce the ice blockage phenomenon.

3. The positive pressure explosion-proof fully enclosed high and low temperature circulation device according to claim 1, characterized in that, The expansion throttling mechanism (25) consists of an expansion valve, a throttle valve and an expansion container. The expansion container is located between the expansion valve and the throttle valve and the expansion valve, the throttle valve are communicated with the expansion container. The expansion valve is connected to the dryer filter.

4. A positive pressure explosion-proof fully enclosed high and low temperature circulation device according to claim 1, characterized in that, The refrigeration heating temperature control system unit further includes an electrical control circuit. The refrigeration compressor (21), the circulation pump (24), the expansion valve and the throttle valve are all electrically connected to the touch operation panel (18) through the electrical control circuit.

5. A positive pressure explosion-proof fully enclosed high and low temperature circulation device according to claim 1, characterized in that, The bottom end of the positive pressure explosion-proof cabinet (1) is welded to the top end of the cabinet support frame (2), and the explosion-proof electrical box (3) is installed at the right-angle groove on the front of the positive pressure explosion-proof cabinet (1) through bolts.

6. The positive pressure explosion-proof fully enclosed high and low temperature circulation device according to claim 1, characterized in that, At the top of one side of the positive pressure explosion-proof cabinet (1), an exhaust pipe (5) and a liquid adding pipe (6) are provided, and the liquid adding pipe (6) is connected to the liquid storage tank (27) through a valve.

7. The positive pressure explosion-proof fully enclosed high and low temperature circulation device according to claim 5, characterized in that, The explosion-proof electrical box (3) is composed of an explosion-proof shell and a single-chip microcomputer control circuit board. The positive pressure explosion-proof cabinet (1) is also connected with a positive pressure gas path control system, which is composed of a ball valve, a filter pressure reducing valve, a one-way throttle valve, an explosion-proof solenoid valve, an exhaust pressure stabilizing valve, a stainless steel pipe, and a flow measurement and pressure measurement system.

8. The positive pressure explosion-proof fully enclosed high and low temperature circulation device according to claim 3, characterized in that, The temperature of the expansion vessel is between 25° and 60°, the expansion vessel is of a closed structure, and the inside of the expansion vessel is filled with a heat-conducting medium.

9. The positive pressure explosion-proof fully enclosed high and low temperature circulation device according to claim 1, characterized in that, When the positive pressure value of the positive pressure explosion-proof cabinet (1) is greater than 250 Pa, the positive pressure chamber of the positive pressure explosion-proof cabinet (1) starts to exhaust automatically; when the positive pressure value of the positive pressure explosion-proof cabinet (1) is less than 80 Pa and greater than 50 Pa, an alarm is prompted, and when the positive pressure value of the positive pressure explosion-proof cabinet (1) is less than 50 Pa, the positive pressure explosion-proof cabinet (1) automatically cuts off the power supply.

10. A positive pressure explosion-proof fully enclosed high and low temperature circulation device according to claim 1, characterized in that, At the bottom of one side of the positive pressure explosion-proof cabinet (1), a cabinet body exhaust valve (11) and a liquid discharge valve (13) are provided, and a cabinet body drain valve (12) is provided on one side of the cabinet support frame (2).

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