CN212720387U - Calibration device for refrigerant charge - Google Patents
Calibration device for refrigerant charge Download PDFInfo
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- CN212720387U CN212720387U CN202021505624.6U CN202021505624U CN212720387U CN 212720387 U CN212720387 U CN 212720387U CN 202021505624 U CN202021505624 U CN 202021505624U CN 212720387 U CN212720387 U CN 212720387U
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Abstract
The utility model provides a calibration device of refrigerant charge volume, the calibration device of refrigerant charge volume, include:the refrigerating system comprises a compressor, a condenser, a liquid storage device, a throttle valve and an evaporator which are connected in sequence; a calibration module mounted to the reservoir to at least mark a highest point H of a calibrated level in the reservoirhCalibrating the middle point H of the liquid levelmAnd calibrating the lowest point H of the liquid levelL. The utility model provides a calibration device of refrigerant charge volume can realize the demarcation of refrigerant charge volume through simple device.
Description
Technical Field
The utility model relates to a compressor field especially relates to a calibration device of refrigerant charge volume.
Background
Currently, the refrigerant charge of a refrigeration system is typically labeled using a pressure plateau method. For example, a refrigerant system is first charged with a minimum charge, refrigerant is charged in increments, and the corresponding discharge pressure change in the refrigerant system is measured and recorded to plot a discharge pressure-charge curve (as shown in fig. 1). And finally, taking the charging quantity at the point b as the system charging quantity.
| Refrigerant charge | State of refrigerant |
| s point | Refrigerant charge initiation point |
| Point s-a | Liquid storage equipment (gas phase) |
| Points a to c | Liquid storage device (gas-liquid two-phase) |
| Point > c | Liquid storage equipment (liquid phase) |
However, it is difficult to experimentally plot an ideal pressure-charge curve, and multiple experiments are required to obtain the curve.
Therefore, how to realize the calibration of the refrigerant charge amount through a simple device is a technical problem to be solved urgently in the field.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an overcome the defect that above-mentioned prior art exists, provide a calibration device that refrigerant fills the volume to through simple device, realize the demarcation that refrigerant fills the volume.
The utility model provides a calibration device of refrigerant charge volume, include:
the refrigerating system comprises a compressor, a condenser, a liquid storage device, a throttle valve and an evaporator which are connected in sequence;
a calibration module mounted to the reservoir to at least mark a highest point H of a calibrated level in the reservoirhCalibrating the middle point H of the liquid levelmAnd calibrating the lowest point H of the liquid levelL。
In some embodiments of the present invention, the calibration module is a liquid observation mirror with scale, the liquid observation mirror is installed in the liquid storage device for calibrating the highest point H of the liquid levelhCalibrating the middle point H of the liquid levelmAnd calibrating the lowest point H of the liquid levelL(ii) a Or the sight glass is arranged on the liquid storage device to mark the height of each liquid level of the liquid storage device.
In some embodiments of the present invention, the calibration module includes a magnetic floating ball or a floating barrel, and the calibration module further includes a magnetic induction sensor, which is installed in the liquid storage device to sense the position of the magnetic floating ball or the floating barrel.
In some embodiments of the present invention, the calibration module further comprises a measurement duct, the measurement duct extends along a gravity direction, and the magnetic floating ball or the float can be followed the measurement duct movably sleeved on the measurement duct.
In some embodiments of the present invention, the calibration module comprises:
an upper float switch located at a nominal level in the reservoirHighest point Hh；
A middle float switch positioned at a middle point H of a standard liquid level in the liquid storage devicem；
A lower float switch positioned at the lowest point H of the calibrated liquid level in the liquid reservoirL，
Each float switch includes a magnetic reed switch and a float having a magnetic portion.
In some embodiments of the present invention, the calibration module comprises:
and differential pressure sensors connected to the bottom and top of the reservoir to measure the pressure at the bottom and pressure difference at the top of the reservoir.
In some embodiments of the present invention, the method further comprises:
the warning module is connected with the calibration module, and when the calibration module indicates that the liquid level in the liquid storage device is lower than the lowest point H of the calibration liquid levelLAnd sound and light alarm is carried out.
In some embodiments of the present invention, the alarm module comprises a light emitting module and/or a speaker.
Compared with the prior art, the utility model has the advantages of as follows:
the refrigerant charge calibration device can be used for calibrating the refrigerant charge, is simple, does not need to draw an ideal pressure-charge curve, realizes simple and quick calibration with less experimental amount, and can be used for protecting refrigerant leakage. Therefore, the refrigerant filling amount can be calibrated through the liquid level in the liquid storage device, and when the system is used for replenishing the refrigerant, the refrigerant can be filled according to the liquid level of the liquid storage device without emptying the original refrigerant.
Drawings
The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 shows a schematic diagram of an exhaust pressure-charge curve.
Fig. 2 shows a schematic diagram of a calibration arrangement for refrigerant charge according to a first embodiment of the present invention.
Fig. 3 shows a schematic diagram of a calibration arrangement for refrigerant charge according to a second embodiment of the present invention.
Fig. 4 shows a schematic diagram of a calibration arrangement for refrigerant charge according to a third embodiment of the present invention.
Fig. 5 shows a schematic diagram of a calibration arrangement for refrigerant charge according to a fourth embodiment of the present invention.
Fig. 6 shows a schematic diagram of a calibration arrangement for refrigerant charge according to a fifth embodiment of the present invention.
Fig. 7 shows a schematic diagram of a calibration arrangement for refrigerant charge according to a fifth embodiment of the present invention.
Fig. 8 shows a flowchart of a method for calibrating a refrigerant charge according to an embodiment of the present invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted.
In order to improve the defects of the prior art, the utility model provides a calibration device of refrigerant charge. The present invention provides a calibration apparatus for refrigerant charge amount according to various embodiments, which is described below with reference to fig. 2 to 7.
Referring first to fig. 2, fig. 2 shows a schematic diagram of a calibration arrangement for refrigerant charge according to a first embodiment of the present invention.
The device for calibrating the refrigerant charge comprises a refrigeration system and a calibration module 7. The refrigerating system comprises a compressor 1, a condenser 2, a liquid storage device 4, a throttle valve 5 and an evaporator 6 which are connected in sequence. A supercooling section 3 is formed between the condenser 2 and the throttle valve 5.
A calibration module 7 is mounted to the reservoir 4 toAt least marks the highest point H of the rated liquid level in the liquid storage device 4hCalibrating the middle point H of the liquid levelmAnd calibrating the lowest point H of the liquid levelL。
In the embodiment shown in fig. 2, the calibration module 7 is a liquid scope with scales, and the liquid scope can be installed only at the highest point H of the calibration liquid level in the liquid reservoir 4hCalibrating the middle point H of the liquid levelmAnd calibrating the lowest point H of the liquid levelL. The sight glass can also be only arranged at the highest point H of the standard liquid level in the liquid storage device 4hCalibrating the middle point H of the liquid levelmAnd calibrating the lowest point H of the liquid levelLWithin a certain range of each point in (a). For example, liquid sight glasses are respectively installed at three height positions of 10% -25%, 60% -85%, and 95% -100% of the liquid reservoirs. The present invention is not limited thereto.
Referring now to fig. 3, fig. 3 shows a schematic diagram of a refrigerant charge calibration apparatus according to a second embodiment of the present invention. Fig. 3 shows a refrigerant charge amount calibration device similar to that of fig. 2, and unlike the refrigerant charge amount calibration device shown in fig. 2, in the present embodiment, the sight glass 7 is installed on the accumulator 4 to indicate the height of each liquid level of the accumulator 4. For example, a liquid scope is attached to 0% to 100% of the entire height of the reservoir 4. In the first and second embodiments, the liquid-viewing mirror 7 can be mounted by sealing quartz glass with a metal material of the liquid reservoir.
In a variation of the first and second embodiments, a communication pipe with scales may be further installed in the liquid reservoir, and the liquid level of the communication pipe is the same as the liquid level in the liquid reservoir, so as to provide an effect similar to that of a sight glass. The communicating pipe can be made of quartz glass materials or other materials (transparent and observable), the liquid storage device is punched, and the communicating pipe and the liquid storage device are installed and sealed.
Referring now to fig. 4, fig. 4 shows a schematic diagram of a refrigerant charge calibration apparatus according to a third embodiment of the present invention. Fig. 5 shows a refrigerant charge calibration device similar to fig. 2, and different from the refrigerant charge calibration device shown in fig. 2, in this embodiment, the calibration module includes a magnetic float ball, and the calibration module further includes a magnetic induction sensor mounted on the reservoir 4 to sense the position of the magnetic float ball. Thereby determining the height of the liquid level of the liquid reservoir 4 according to the position of the magnetic floating ball. In this embodiment, the magnetic float ball is disposed in the liquid reservoir, the magnetic induction sensor may be mounted on an outer wall of the liquid reservoir, and the magnetic induction sensor may be fixed to the liquid reservoir 4 by adhesion or the like.
Referring now to fig. 5, fig. 5 is a schematic diagram illustrating a refrigerant charge calibration apparatus according to a fourth embodiment of the present invention. The refrigerant charge amount calibration apparatus shown in fig. 5 is similar to that shown in fig. 2, and unlike the refrigerant charge amount calibration apparatus shown in fig. 2, in the present embodiment, the calibration module includes an upper float switch, a middle float switch, and a lower float switch. Each float switch includes a magnetic reed switch and a float having a magnetic portion. When the float moves up and down along with the detected liquid level, the magnetic reed switch is triggered to detect the liquid level position. Specifically, the upper float switch is positioned at the highest point H of the rated liquid level in the liquid storage deviceh. The middle floater switch is positioned at the middle point H of the standard liquid level in the liquid storage devicem. The lower float switch is positioned at the lowest point H of the standard and calibrated liquid level in the liquid storage deviceL. In this embodiment, the float switch is placed in the reservoir, and a port is provided in a side wall or other location of the reservoir and sealed. The signal feedback of each float switch can be provided with three lead-out ports or share one lead-out port.
Referring now to fig. 6, fig. 6 shows a schematic diagram of a refrigerant charge calibration apparatus according to a fifth embodiment of the present invention. The calibration arrangement for the refrigerant charge shown in fig. 6 is similar to that shown in fig. 2, and differs from the calibration arrangement for the refrigerant charge shown in fig. 2 in that in the present embodiment the calibration module comprises a differential pressure sensor. Differential pressure sensors are connected to the bottom and top of the reservoir to measure the pressure at the bottom and pressure difference at the top of the reservoir. The liquid level in the reservoir 4 can be calculated from the pressure difference according to the following formula:
ΔP＝ρgh
where Δ P is the detected pressure difference, ρ is the liquid density, g is the gravitational acceleration, and h is the liquid level height in the reservoir 4. In this embodiment, the bottom and top of the reservoir may be vented and sealed for connection to the interface of the differential pressure sensor.
Referring now to fig. 7, fig. 7 is a schematic diagram illustrating a refrigerant charge calibration apparatus according to a fifth embodiment of the present invention. Fig. 7 shows a refrigerant charge calibration device similar to fig. 2, and different from the refrigerant charge calibration device shown in fig. 2, in this embodiment, the calibration module includes a magnetic floating ball or a float, and the calibration module further includes a magnetic induction sensor mounted on the reservoir to sense the position of the magnetic floating ball or the float. Further, in this embodiment, the calibration module further includes a measurement duct extending in a gravity direction, and the magnetic floating ball or the float bowl is movably sleeved on the measurement duct along the measurement duct to limit horizontal movement of the floating ball or the float bowl. In this embodiment, a leading-out port may be formed at the top of the liquid reservoir, the magnetic float and the measuring conduit are disposed in the liquid reservoir, and the magnetic induction sensor is disposed outside the liquid reservoir.
Further, in the above embodiments, the calibration device of the refrigerant charge amount may further include an alarm module. The warning module can be connected with the calibration module, and when the calibration module indicates that the liquid level in the liquid reservoir is lower than the lowest point H of the calibration liquid levelLAnd alarming is carried out when the alarm is given. In some embodiments of the present invention, the alarm module comprises a light emitting module and/or a speaker.
The utility model also provides a calibration method of refrigerant charge volume is applied to as above the calibration arrangement of refrigerant charge volume. As shown in fig. 8, the method for calibrating the refrigerant charge includes:
step S110: setting the highest point H of the calibrated liquid level in the liquid storage devicehAnd calibrating the lowest point H of the liquid levelL。
Specifically, a step of selecting a type of the reservoir may be further included before step S110. The mass of refrigerant in the accumulator should be equal to the total amount of refrigerant leakage allowed for the specified age. Namely, it is
V×ρ×x％＝a×n
In the formula: v is the volume of the reservoir in cm3(ii) a Rho is the density of the refrigerant in kg/m3(ii) a x% is the volume ratio of the liquid refrigerant in the liquid storage device; a is the allowable leakage amount, and the unit is g/year; and n is the leakage age.
Step S120: setting an initial calibration liquid level midpoint H in the reservoirm0。
Specifically, the highest point H of the liquid level is calibratedhThe height of the reservoir can be selected to be 90-100%, and the height of the reservoir can be preferably selected to be 95-100%; initial calibration liquid level middle point Hm0The height of the liquid reservoir can be selected to be 60% -85%, and the height of the liquid reservoir can be preferably selected to be 70% -80%; calibrating lowest point H of liquid levelLThe height of the reservoir can be selected to be 0% -25%, and the height of the reservoir can be preferably selected to be 5% -20%.
Step S130: refrigerant charge to the refrigeration system is performed at a preset charge amount S.
Step S140: and operating the refrigerating system under a rated working condition.
Step S150: filling the refrigerating system with refrigerant in a gradual manner until the liquid level in the liquid accumulator reaches an initial calibration liquid level intermediate point Hm0。
Step S160: operating a compressor in the refrigeration system at a preset rotational speed.
Specifically, step S160 may include operating a compressor in the refrigeration system at a preset maximum rotational speed; and operating the compressor in the refrigeration system at a preset minimum rotation speed to adapt to the limit rotation speed.
Step S170: judging whether the liquid level in the liquid storage device is kept at the highest point H of the calibrated liquid levelhAnd the lowest point H of the calibration liquid levelLIn the meantime.
If the determination in step S170 is yes, step S180 is executed: the initial calibration liquid level middle point Hm0As the middle point H of the calibrated liquid levelm。
If the determination in step S170 is no, step S190 is executed: adjusting the initial calibration liquid level middle point Hm0. Step S130 is then repeatedly executed until step S170 determines yes.
In particular, the initial calibration level middle point H may be adjusted bym0: if the liquid level in the liquid reservoir is higher than the highest point H of the calibrated liquid levelhIf the refrigerant is excessive, lowering the initial calibrated liquid level middle point Hm0(ii) a If the liquid level in the liquid reservoir is lower than the highest point H of the calibrated liquid levelLIf the refrigerant is insufficient, increasing the initial calibration liquid level middle point Hm0。
Particularly, the utility model discloses can also realize that the refrigerant reveals protect function through following step: in the normal operation process of the refrigerating system, if the liquid level of the refrigerant in the liquid storage device is higher than the lowest point H of the calibrated liquid levelLThe sensor outputs a feedback signal normal which indicates that the refrigerant quantity is normal; if the liquid level of the refrigerant in the liquid storage device is lower than the lowest point H of the calibrated liquid levelLAnd the sensor outputs a feedback signal false which indicates that the refrigerant is insufficient, and an alarm is given.
The above description is merely exemplary in nature and is not intended to limit the present disclosure.
Compared with the prior art, the utility model has the advantages of as follows:
the refrigerant charge calibration device can be used for calibrating the refrigerant charge, is simple, does not need to draw an ideal pressure-charge curve, realizes simple and quick calibration with less experimental amount, and can be used for protecting refrigerant leakage. Therefore, the refrigerant filling amount can be calibrated through the liquid level in the liquid storage device, and when the system is used for replenishing the refrigerant, the refrigerant can be filled according to the liquid level of the liquid storage device without emptying the original refrigerant.
Exemplary embodiments of the present invention have been particularly shown and described above. It is to be understood that the invention is not to be limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the scope of the appended claims.
Claims (8)
1. A calibration device for refrigerant charge, comprising:
the refrigerating system comprises a compressor, a condenser, a liquid storage device, a throttle valve and an evaporator which are connected in sequence;
a calibration module mounted to the reservoir to at least mark a highest point H of a calibrated level in the reservoirhCalibrating the middle point H of the liquid levelmAnd calibrating the lowest point H of the liquid levelL。
2. The refrigerant charge calibration apparatus as recited in claim 1, wherein said calibration module is a calibrated sight glass installed at a highest calibrated liquid level point H in said accumulatorhCalibrating the middle point H of the liquid levelmAnd calibrating the lowest point H of the liquid levelL(ii) a Or the sight glass is arranged on the liquid storage device to mark the height of each liquid level of the liquid storage device.
3. The refrigerant charge calibration apparatus as recited in claim 1, wherein said calibration module comprises a magnetic float ball or a float bowl, said calibration module further comprising a magnetic induction sensor mounted to said reservoir for sensing a position of said magnetic float ball or float bowl.
4. A calibration arrangement for refrigerant charge according to claim 3, wherein the calibration module further comprises a measuring conduit extending in the direction of gravity, the magnetic float ball or buoy being movably journalled in the measuring conduit along the measuring conduit.
5. The apparatus for calibrating a refrigerant charge according to claim 1, wherein said calibration module comprises:
an upper float switch positioned at the highest point H of the nominal liquid level in the liquid reservoirh；
A middle float switch located in the reservoirMiddle point H of standard liquid level in liquid devicem；
A lower float switch positioned at the lowest point H of the calibrated liquid level in the liquid reservoirL，
Each float switch includes a magnetic reed switch and a float having a magnetic portion.
6. The apparatus for calibrating a refrigerant charge according to claim 1, wherein said calibration module comprises:
and differential pressure sensors connected to the bottom and top of the reservoir to measure the pressure at the bottom and pressure difference at the top of the reservoir.
7. The apparatus for calibrating a refrigerant charge according to claim 1, further comprising:
the warning module is connected with the calibration module, and when the calibration module indicates that the liquid level in the liquid storage device is lower than the lowest point H of the calibration liquid levelLAnd sound and light alarm is carried out.
8. The apparatus for calibrating refrigerant charge according to claim 7, wherein said alarm module comprises a light module and/or a speaker.
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| CN202021505624.6U CN212720387U (en) | 2020-07-27 | 2020-07-27 | Calibration device for refrigerant charge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111735239A (en) * | 2020-07-27 | 2020-10-02 | 上海海立新能源技术有限公司 | Device and method for calibrating refrigerant charge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111735239A (en) * | 2020-07-27 | 2020-10-02 | 上海海立新能源技术有限公司 | Device and method for calibrating refrigerant charge |
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