Heating and two-stage cryogenic working medium temperature control device

Abstract

The utility model relates to a heating and two-stage cryogenic working medium temperature control device which comprises a refrigerator, a working medium inlet pipe, a liquid inlet valve arranged on the working medium inlet pipe, a working medium outlet pipe, a liquid outlet valve arranged on the working medium outlet pipe, a first temperature sensor, a first-stage heat exchanger, a second-stage heat exchanger, a second-stage heat exchanger and a second-stage heat exchanger, the working medium inlet pipe is connected with the working medium outlet pipe; the electric heating pipe and the first-stage heat exchanger are connected in parallel between the working medium inlet pipe and the working medium outlet pipe and used for heating the working medium; the three-way proportional valve is respectively connected with the primary heat exchanger, the electric heating pipe and the working medium outlet pipe or the working medium inlet pipe; the secondary heat exchanger is arranged on the working medium outlet pipe and is connected with the refrigerator; and the first valve and the second-stage heat exchanger are connected in parallel between the working medium inlet pipe and the working medium outlet pipe. According to the working medium temperature control device, the electric heating pipe, the refrigerator and the secondary heat exchanger are additionally arranged, so that the temperature range is expanded, the temperature range can be controlled to be-30 DEG C to 150 DEG C, and the working medium temperature control device is simple in structure and convenient to use.

Description

Technical Field

[0001] The utility model relates to a working medium temperature control device, in particular to a working medium temperature control device for heating and two-stage deep cooling. Background Art

[0002] The oil temperature in the current automobile engine test equipment needs to be controlled by an external device to simulate the oil temperature control of the automobile driving condition. Most of the engine oil temperature control equipment in the laboratory adopts a primary heat exchanger for temperature control, and the temperature cannot be controlled below zero. For example, CN104420928A discloses an oil temperature controller in the engine test process, which includes an oil filter support, and an oil inlet hole and an oil return hole on the support, and is characterized in that: a heat exchanger is fixedly arranged near the oil filter support, and the two ends of the heat exchanged pipeline in the heat exchanger are respectively connected to the oil inlet hole and the oil return hole on the support, and the two ends of the heat exchange medium pipeline in the heat exchanger are respectively connected to the water inlet pipe and the drain pipe with a solenoid valve; an oil temperature sensor is arranged on the main engine oil channel or in the oil pan, and the oil temperature sensor is connected to the temperature switch and the solenoid valve on the water inlet pipe in turn. The oil temperature controller adopts a primary heat exchange at normal temperature, which cannot achieve sub-zero and high temperature control. Utility Model Content

[0003] In order to solve the above problem that the working medium cannot achieve low temperature and high temperature below zero, the utility model provides a working medium temperature control device for heating and two-stage deep cooling, and the specific technical solution is as follows:

[0004] A working fluid temperature control device for heating and secondary deep cooling, comprising a refrigerator, a working fluid inlet pipe, a liquid inlet valve arranged on the working fluid inlet pipe, a working fluid outlet pipe, a liquid outlet valve arranged on the working fluid outlet pipe and a first temperature sensor, and also comprising: a primary heat exchanger connected to the cooling device and connected to the working fluid inlet pipe and the working fluid outlet pipe; an electric heating pipe connected in parallel with the primary heat exchanger between the working fluid inlet pipe and the working fluid outlet pipe for heating the working fluid; a three-way proportional valve connected respectively to the primary heat exchanger, the electric heating pipe, the working fluid outlet pipe or the working fluid inlet pipe; a secondary heat exchanger arranged on the working fluid outlet pipe and connected to the refrigerator; and a first valve connected in parallel with the secondary heat exchanger between the working fluid inlet pipe and the working fluid outlet pipe.

[0005] Preferably, it also includes: a working fluid pump; and a working fluid valve, which is connected in parallel with the working fluid pump on the working fluid inlet pipe.

[0006] Preferably, it further comprises: a working fluid box; and a recovery valve, which is arranged on the working fluid box and connected to the working fluid inlet pipe and the working fluid pump.

[0007] Preferably, it further comprises: a second inlet pipe, arranged on the working fluid pump; and a second valve, arranged on the second inlet pipe.

[0008] Furthermore, it also includes: a third valve, which is connected to the electric heating pipe, the working fluid pump and the working fluid valve respectively.

[0009] Preferably, it also includes: a first pressure gauge, which is arranged on the working medium outlet pipe.

[0010] Preferably, it also includes: a working fluid filter, which is arranged on the working fluid outlet pipe.

[0011] Preferably, the refrigerator includes: a condenser connected to the cooling device; an expansion valve connected to the condenser and the secondary heat exchanger respectively; and a compressor connected to the secondary heat exchanger and the condenser respectively.

[0012] Furthermore, it also includes: a proportional flow valve connected in parallel with the compressor between the secondary heat exchanger and the condenser.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The utility model provides a heating and two-stage cryogenic working medium temperature control device which expands the temperature range by adding an electric heating tube, a refrigerator and a two-stage heat exchanger, and can control the temperature range within -30 to 150°C, and has a simple structure and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0016] The utility model is now further described with reference to the accompanying drawings.

[0017] like Figure 1 As shown, a working medium temperature control device for heating and two-stage deep cooling includes a refrigerator 6, a working medium inlet pipe 41, a working medium outlet pipe 42, a liquid inlet valve 43, a liquid outlet valve 44, a first temperature sensor 81, an electric heating tube 2, a three-way proportional valve 3, a primary heat exchanger 1, a secondary heat exchanger 71 and a first valve 72.

[0018] The primary heat exchanger 1 is connected to a cooling device, which is an existing mature product, such as a cooling tower, to provide cooling water at room temperature. The inlet and outlet of the primary heat exchanger 1 are respectively connected to the working fluid inlet pipe 41 and the working fluid outlet pipe 42. The working fluid outlet pipe 42 is provided with a first temperature sensor 81 for detecting the temperature of the working fluid. The ends of the working fluid inlet pipe 41 and the working fluid outlet pipe 42 are respectively provided with a liquid inlet valve 43 and a liquid outlet valve 44. The electric heating pipe 2 is connected in parallel with the primary heat exchanger 1 between the working fluid inlet pipe 41 and the working fluid outlet pipe 42. The electric heating pipe 2 heats the working fluid inside by electric heating, and can heat the working fluid to 150°C. The electric heating pipe 2 is also provided with a second temperature sensor 82 for detecting the heating temperature. The three-way proportional valve 3 is respectively connected to the primary heat exchanger 1, the electric heating pipe 2, and the working fluid outlet pipe 42. The three-way proportional valve 3 is used to adjust the mixed working fluid ratio between the outlet of the primary heat exchanger 1 and the outlet of the electric heating pipe 2, thereby controlling the temperature of the working fluid. The primary heat exchanger 1 is used to reduce the temperature of the working fluid, which can be reduced to a temperature slightly higher than the current ambient temperature. The electric heating tube 2 is used to heat the working fluid. The working fluid with a lower temperature can ensure the accuracy of the temperature, and is controlled according to the set temperature combined with the current ambient temperature. The secondary heat exchanger 71 is connected in parallel to the working fluid outlet pipe 42 through the first valve 72. The secondary heat exchanger 71 is connected to the refrigerator 6. The secondary heat exchanger 71 is equivalent to the evaporator of the refrigerator 6 and is used to provide low temperature. The secondary heat exchanger 71 reduces the temperature of the working fluid to below zero, which can be reduced to -30°C; when the first valve 72 is closed, the working fluid passes through the secondary heat exchanger 71.

[0019] In order to improve the scope of application, it also includes a working fluid pump 51, a working fluid valve 52, a working fluid box 56, a recovery valve 55, a second inlet pipe 53 and a second valve 54. The working fluid valve 52 and the working fluid pump 51 are connected in parallel to the working fluid inlet pipe 41, and the second inlet pipe 53 is connected to the working fluid pump 51 and the second valve 54 respectively. The working fluid box 56 is connected to the working fluid pump 51 and the working fluid valve 52 through the recovery valve 55. When the external pump is provided, the working fluid valve 52 is opened and connected through the working fluid inlet pipe 41. When there is no external pump, it is connected through the second inlet pipe 53, the working fluid valve 52 is closed, and the working fluid pump 51 provides the power for circulation. The working fluid box 56 is used to recover the working fluid, and the recovery valve 55 is opened during recovery.

[0020] A third valve 57 is also installed on the working fluid inlet pipe 41 , and the third valve 57 is connected to the electric heating pipe 2 , the working fluid pump 51 , the working fluid valve 52 and the recovery valve 55 respectively.

[0021] The working medium outlet pipe 42 is also provided with a first pressure gauge 83 and a working medium filter 84 .

[0022] The refrigerator 6 can be an existing refrigerator 6 or a customized refrigerator 6. The customized refrigerator 6 includes a condenser 62, an expansion valve 63, a compressor 61, a proportional flow valve 64 and a refrigerant filter 65. The condenser 62 is connected to the cooling device, the compressor 61 and the expansion valve 63 respectively; the expansion valve 63 is also connected to the secondary heat exchanger 71; the compressor 61 is also connected to the secondary heat exchanger 71 through the refrigerant filter 65. The proportional flow valve 64 is connected in parallel with the compressor 61.

[0023] High-temperature working medium: the first valve 72 is opened, the refrigerator 6 is closed, the working medium passes through the electric heating tube 2 and the three-way proportional valve 3, and the electric heating tube 2 heats the working medium to a set temperature.

[0024] Normal temperature working medium: the first valve 72 is opened, the refrigerator 6 is closed, and the working medium is adjusted to the set temperature through the primary heat exchanger 1 and the three-way proportional valve 3. The temperature can also be adjusted through the electric heating tube 2 at the same time, and the three-way proportional valve 3 controls the mixing of the normal temperature working medium and the high temperature working medium to obtain the set temperature.

[0025] Low-temperature working medium: the first valve 72 is closed, the refrigerator 6 is turned on, and the working medium first passes through the primary heat exchanger 1 for preliminary heat exchange to reduce the temperature, and then passes through the secondary heat exchanger 71 to reduce the temperature to the set low-temperature temperature.

[0026] The electric heating tube 2 is connected in parallel with the primary heat exchanger 1 to shorten the pipeline and increase the flow rate.

[0027] The working fluid pump 51 is arranged at the bottom of the device to avoid flow interruption.

[0028] The middle opening of the refrigerant filter 65 is connected to the proportional flow valve 64 through a pipeline, and returns to the compressor 61 through the proportional flow valve 64 to form a bypass loop. The opening of the proportional flow valve 64 is adjusted to adjust the power input of the compressor 61, and it is also beneficial to oil return.

[0029] The first temperature sensor 81 and the second temperature sensor 82 installed in the pipeline feed back the temperature to the control system. The control system realizes closed-loop control by controlling the opening of the three-way proportional valve 3 and the proportional flow valve 64 and the heating amount of the electric heating tube 2, thereby improving the accuracy of temperature control.

[0030] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the claims of the present invention.

Claims

1. A working medium temperature control device for heating and two-stage cryogenics, comprising a refrigerator (6), a working medium inlet pipe (41), a liquid inlet valve (43) arranged on the working medium inlet pipe (41), a working medium outlet pipe (42), a liquid outlet valve (44) arranged on the working medium outlet pipe (42), and a first temperature sensor (81), characterized in that: Also includes: A primary heat exchanger (1) is connected to the cooling device and is connected to the working medium inlet pipe (41) and the working medium outlet pipe (42); An electric heating pipe (2) connected in parallel with the first-stage heat exchanger (1) between the working medium inlet pipe (41) and the working medium outlet pipe (42) for heating the working medium; A three-way proportional valve (3) is respectively connected to the primary heat exchanger (1), the electric heating pipe (2), the working fluid outlet pipe (42) or the working fluid inlet pipe (41); a secondary heat exchanger (71), which is disposed on the working medium outlet pipe (42) and connected to the refrigerator (6); and The first valve (72) is connected in parallel with the secondary heat exchanger (71) between the working fluid inlet pipe (41) and the working fluid outlet pipe (42).

2. A working medium temperature control device for heating and two-stage cryogenic cooling according to claim 1, characterized in that: Also includes: Working fluid pump (51); as well as A working fluid valve (52) is connected in parallel with the working fluid pump (51) on the working fluid inlet pipe (41).

3. A working medium temperature control device for heating and two-stage cryogenic cooling according to claim 2, characterized in that: Also includes: Working fluid box (56); as well as The recovery valve (55) is arranged on the working fluid box (56) and is connected to the working fluid inlet pipe (41) and the working fluid pump (51).

4. A working medium temperature control device for heating and two-stage cryogenic cooling according to claim 2, characterized in that: Also includes: A second inlet pipe (53) is provided on the working fluid pump (51); as well as The second valve (54) is arranged on the second inlet pipe (53).

5. A working medium temperature control device for heating and two-stage cryogenic cooling according to claim 4, characterized in that: Also includes: The third valve (57) is respectively connected to the electric heating pipe (2), the working fluid pump (51) and the working fluid valve (52).

6. A working medium temperature control device for heating and two-stage cryogenic cooling according to claim 1, characterized in that: Also includes: The first pressure gauge (83) is arranged on the working medium outlet pipe (42).

7. A working medium temperature control device for heating and two-stage cryogenic cooling according to claim 1, characterized in that: Also includes: A working medium filter (84) is arranged on the working medium outlet pipe (42).

8. A working medium temperature control device for heating and two-stage cryogenic cooling according to any one of claims 1 to 7, characterized in that: The refrigerator (6) comprises: a condenser (62), connected to the cooling device; an expansion valve (63), connected to the condenser (62) and the secondary heat exchanger (71), respectively; and The compressor (61) is connected to the secondary heat exchanger (71) and the condenser (62) respectively.

9. A working medium temperature control device for heating and two-stage cryogenic cooling according to claim 8, characterized in that: It also includes: a proportional flow valve (64) connected in parallel with the compressor (61) and between the secondary heat exchanger (71) and the condenser (62).

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