CN207964163U - Constant temperature and pressure calibrating installation - Google Patents
Constant temperature and pressure calibrating installation Download PDFInfo
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- CN207964163U CN207964163U CN201820234222.3U CN201820234222U CN207964163U CN 207964163 U CN207964163 U CN 207964163U CN 201820234222 U CN201820234222 U CN 201820234222U CN 207964163 U CN207964163 U CN 207964163U
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Abstract
The utility model discloses a kind of constant temperature and pressure calibrating installation, including seal box, calibrating case, pressure-regulating device and temperature-adjusting device；Wherein, the seal box is formed with the gas channel for air circulation for sealing the calibrating case, and between the seal box and the calibrating case；The calibrating case is installed in the seal box, and calibration equipment is waited for for accommodating；The pressure-regulating device is used to adjust the pressure in the calibrating case so that the pressure adjustable in the calibrating case, and constant pressure can be kept；The temperature-adjusting device is used to adjust the temperature in the calibrating case so that the temperature in the calibrating case is adjustable, and can keep constant temperature.By temperature-adjusting device and pressure-regulating device being reasonably integrated in one, and then can be effectively ensured the constant of the temperature and pressure examined and determine in case calibrating can be completed by a calibrating installation, calibrating efficiency is higher in the technical solution of the utility model.
Description
Technical Field
The utility model relates to a detect technical field, in particular to constant temperature and constant pressure calibrating installation.
Background
The air pressure gauge of the empty box measures the atmospheric pressure by converting the elastic deformation of the diaphragm box under the action of the atmospheric pressure into corresponding pointer rotation quantity through a transmission mechanism.
The verification items of the air pressure gauge of the empty box comprise temperature coefficient verification and indicating value verification. Wherein, the temperature coefficient is detected by placing an air gauge of an empty box into a temperature coefficient detection box, the temperature coefficient detection is carried out at any point (namely, a low temperature point and a high temperature point) in two temperature ranges of 0-5 ℃ and 25-35 ℃, the sequence of the two temperature points can be randomly selected, but the temperature difference is more than 20 ℃; the air pressure value of the empty box barometer is read and recorded under the conditions of low and high temperature points. The air pressure gauge with the temperature coefficient calibrated can be used for indicating value calibration, before the indicating value calibration, the temperature of the air pressure gauge must be balanced with the room temperature, the air pressure gauge is placed in an indicating value calibration box, the pressure is changed from high pressure to low pressure, then from low pressure to high pressure (the sequence is reversible), the middle part must be continuously and uninterruptedly kept, the trend is kept unchanged, wherein the stabilization time of each calibration point is not less than 5min, and the air pressure indicating value of the air pressure gauge is read and recorded after stabilization.
The temperature coefficient verification and the indication value verification in the existing verification device need to be carried out in two devices respectively, the operation is complex, and the verification efficiency is low.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a constant temperature and constant pressure calibrating installation aims at realizing constant temperature and constant pressure calibrating installation's integration, and then effectively promotes verification efficiency.
In order to achieve the above purpose, the utility model provides a constant temperature and constant pressure calibrating device, which comprises a seal box, a calibrating box, a pressure regulating device and a temperature regulating device; wherein,
the seal box is used for sealing the verification box, and an air flow channel for air circulation is formed between the seal box and the verification box;
the detection box is arranged in the seal box and used for accommodating equipment to be detected;
the pressure adjusting device is used for adjusting the pressure in the verification box, so that the pressure in the verification box can be adjusted and can be kept constant;
the temperature adjusting device is used for adjusting the temperature in the verification box, so that the temperature in the verification box can be adjusted and can be kept constant.
Optionally, the verification box comprises a bottom plate, a top plate arranged opposite to the bottom plate, and a plurality of side plates arranged between the bottom plate and the top plate and sequentially connected with each other; the bottom plate is provided with an air outlet, and the air outlet is provided with a fan; the top end of the side plate is provided with an air inlet communicated with the air outlet; the two side plates which are oppositely arranged are respectively provided with a first air pipe and a second air pipe which are communicated with the verification box; the first air pipe and the second air pipe penetrate through the seal box and extend out of the seal box.
Optionally, the pressure adjusting device includes a first pressure increasing device and a first flow adjusting device disposed on the first air pipe, and a second pressure increasing device and a second flow adjusting device disposed on the second air pipe.
Optionally, when the internal pressure of the verification box needs to rise, the first pressurization device starts external air to enter the verification box from the first air pipe; the first flow regulating device regulates the flow of air in the first air pipe to control the amount of air entering the verification box; the air in the verification box is discharged out of the verification box through the second air pipe, the second flow regulating device regulates the flow of the air in the second air pipe so as to control the discharge of the air quantity of the verification box and ensure that the air quantity entering the verification box is larger than the discharge of the air quantity of the verification box.
Optionally, when the internal pressure of the verification box needs to be reduced, the second pressurization device starts external air to enter the verification box through the second air pipe; the second flow regulating device regulates the flow of air in the second air pipe to control the amount of air entering the verification box; the air in the verification box is discharged out of the verification box through the first air pipe, and the first flow regulating device regulates the flow of the air in the first air pipe so as to control the amount of the air discharged out of the verification box and ensure that the amount of the air entering the verification box is smaller than the amount of the air discharged out of the verification box.
Optionally, the temperature adjusting device includes a heat exchanger, a heating device and a refrigerating device; the heat exchanger is arranged below the verification box and corresponds to the position of the air outlet, and the heating device is used for heating the heat exchanger; the refrigerating device is used for refrigerating the heat exchanger; the air in the verification box is discharged from the air outlet under the action of the fan, is uniformly mixed in the airflow channel after exchanging heat with the heat exchanger, and finally flows back into the verification box from the air inlet.
Optionally, the constant temperature and constant pressure calibrating apparatus further comprises a temperature compensating device, wherein the temperature compensating device is used for compensating the temperature of the air passing through the pressure regulating device entering the calibrating box.
Optionally, the temperature compensation device comprises a liquid storage tank and a coiled pipe arranged in a serpentine shape; liquid for adjusting the temperature in the coil pipe is stored in the liquid storage tank; one end of the coil pipe is respectively communicated with the first air pipe and the second air pipe through a tee joint, and the other end of the coil pipe is communicated with the verification box; the air entering the coil pipe through the first air pipe or the second air pipe enters the verification box after being heated or cooled by the liquid.
Optionally, the top plate is made of a transparent material; the side plates are detachably provided with cabin doors for opening or closing the verification box.
Optionally, the constant temperature and constant pressure calibrating apparatus further comprises a housing; the sealing box and the temperature regulating device are both arranged in the shell; and the bottom of the shell is provided with rollers.
According to the technical scheme of the utility model, the temperature adjusting device and the pressure adjusting device are reasonably integrated into a whole, so that the constancy of the temperature and the pressure in the verification box can be effectively ensured, the verification can be completed through one verification device, and the verification efficiency is higher; meanwhile, the influence of temperature change on pressure and the influence of pressure change on temperature can be effectively reduced; and through setting up temperature compensation device, can effectively reduce outside air and when entering into the examination case, the temperature fluctuation that causes has guaranteed constant temperature and constant pressure calibrating installation's stability, and then has effectively promoted verification efficiency, has reduced the verification cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic view of a three-dimensional assembly structure of an embodiment of the constant temperature and pressure calibrating apparatus of the present invention;
FIG. 2 is a schematic perspective exploded view of the constant temperature and pressure calibrating apparatus shown in FIG. 1;
FIG. 3 is a schematic view of the three-dimensional assembly of the seal box and the verification box of the constant temperature and pressure verification device of the present invention;
FIG. 4 is a schematic cross-sectional view of FIG. 3;
fig. 5 is a schematic block diagram of a pressure regulating device of the constant temperature and pressure calibrating device of the present invention;
fig. 6 is a schematic block diagram of the temperature adjustment device of the constant temperature and pressure calibrating apparatus of the present invention.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The utility model provides a constant temperature and constant pressure calibrating installation.
As shown in fig. 1 to 6, in the present embodiment, the constant temperature and pressure certification apparatus includes a housing 100, a seal box 200, a certification box 300, a pressure adjustment device 400, a temperature adjustment device 500, and a temperature compensation device 600. Wherein,
as shown in fig. 1 and 2, the housing 100 includes a first bottom plate 120 and a plurality of first side plates 140 connected in sequence. The first base plate 120 is mounted with rollers 122 to facilitate movement of the constant temperature and pressure calibrating apparatus. One of the first side plates 140 is provided with a first opening (not shown) for avoiding a hatch of the certification box 300. The housing 100 mainly serves to beautify the appearance of the constant temperature and constant pressure certification apparatus and to protect the internal components (e.g., the seal box 200, the certification box 300, the temperature adjusting device 500, and the temperature compensating device 600).
As shown in fig. 3 and 4, and referring to fig. 1 to 2, the seal box 200 is disposed between the housing 100 and the certification box 300, and an air flow channel 203 for circulating air is formed between the seal box 200 and the certification box 300. The seal box 200 includes a second bottom plate 220 and a plurality of second side plates 260 connected in sequence. The second bottom plate 220 is recessed downward to form a receiving portion 222. And a second side plate 260 of the second side plates 260 facing the first opening is provided with a second opening (not shown) corresponding to the first opening.
As shown in fig. 3 and 4 (the direction of the arrow in fig. 3 indicates the air circulation direction), and referring to fig. 1 to 2, the verification box 300 is used for accommodating a device to be verified (e.g., an empty box pressure gauge, etc.), and includes a third bottom plate 320, a top plate 340 disposed opposite to the third bottom plate 320, and a plurality of third side plates 360 disposed between the third bottom plate 320 and the top plate 340 and sequentially connected thereto.
Specifically, an air outlet (not shown) is disposed at a position of the third bottom plate 320 corresponding to the accommodating portion 222, the air outlet is provided with a fan 322, and the fan 322 is used for driving air in the verification box to be discharged out of the verification box 300 through the air outlet. The top end of the third side plate 360 is provided with an air inlet 362, and the air inlet 362 is communicated with the air outlet via the airflow channel 203. The air exhausted from the air outlet is heated or cooled by the temperature adjusting device 500, then flows to the air inlet 362 through the air flow channel 203, and enters the verification box 300 through the air inlet 362, so that the temperature of the air in the verification box 300 is adjusted, and the temperature in the verification box 300 is kept stable.
As shown in fig. 5 and referring to fig. 1 to 4, the two third side plates 360 disposed opposite to each other are respectively provided with a first air pipe 364 and a second air pipe 366; the first air tube 364 and the second air tube 366 both extend out of the enclosure 100 through the seal box 200 and the enclosure 100, and are used for introducing air into the verification box 300 or exhausting the air in the verification box 300 from the verification box 300, so as to balance the air pressure in the verification box 300, and keep the pressure in the verification box 300 stable.
The top plate 340 is preferably a plate material (e.g., a transparent acrylic plate) made of a transparent material so that a user can see the reading of the device to be calibrated through the top plate 340 for convenient operation by the user.
One of the third side panels 360 is provided with a hatch 368 on the third side panel 360. The hatch 368 is removably and sealingly connected to the third side panel 360. Hatch door 368 passes in proper order the second opening with behind the first opening, extend outside shell 100, be used for opening or close examination case 300 is in order to realize waiting getting of the equipment of setting is put.
As shown in fig. 5, and referring to fig. 1 to 4, the pressure adjusting device 400 is used to adjust the pressure inside the verification box 300, so that the pressure inside the verification box 300 is adjustable and can be maintained at a constant pressure. The pressure adjusting device 400 includes a first pressurizing device 420 and a first flow rate adjusting device 440 disposed on the first air pipe 364, and a second pressurizing device 460 and a second flow rate adjusting device 480 disposed on the second air pipe 366. The first pressure increasing device 420 and the second pressure increasing device 460 may be a pressure increasing pump or an air pump; and the first flow regulating device 440 and the second flow regulating device 480 may be flow regulating valves, etc.
Specifically, when the internal pressure of the verification box 300 needs to be increased, the first pressurization device 420 starts external air to enter the verification box 300 through the first air pipe 364; the first flow regulating device 440 regulates the flow of air within the first air tube 364 to control the amount of air entering the certification tank 300; the air in the verification box 300 is discharged out of the verification box 300 through the second air pipe 366, and the second flow regulating device 480 regulates the flow rate of the air in the second air pipe 366 so as to control the amount of the air discharged out of the verification box 300 and ensure that the amount of the air entering the verification box 300 is larger than the amount of the air discharged out of the verification box 300, so that more and more air is in the verification box 300, and the pressure boosting operation of the verification box 300 is realized.
When the internal pressure of the verification box 300 needs to be reduced, the second pressurization device 460 starts external air to enter the verification box 300 through the second air pipe 366; the second flow regulator 480 regulates the flow of air in the second air pipe 366 to control the amount of air entering the certification box 300; the air in the verification box 300 is discharged out of the verification box 300 through the first air pipe 364, and the first flow regulating device 440 regulates the flow rate of the air in the first air pipe 364 to control the amount of the air discharged out of the verification box 300 and ensure that the amount of the air entering the verification box 300 is less than the amount of the air discharged out of the verification box 300, so that the air in the verification box 300 is less and less, and the pressure reduction operation of the verification box 300 is realized.
As shown in fig. 6 and referring to fig. 1 to 4, the temperature adjustment device 500 is used to adjust the temperature inside the certification box 300, so that the temperature inside the certification box 300 is adjustable and can be maintained at a constant temperature.
Further, in the present embodiment, the temperature adjustment device 500 includes a heat exchanger 520, a heating device 540, and a cooling device 560. The heat exchanger 520 is installed below the verification box 300 and at a position corresponding to the air outlet, and preferably, in this embodiment, the heat exchanger 520 is installed in the accommodating portion 222 of the second bottom plate 220 of the seal box 200 and is closely attached to the third bottom plate 320, so that the air discharged from the air outlet can exchange heat with the heat exchanger 520 at the first time. The heating device 540 is used for heating the heat exchanger 520; the cooling device 560 is used for cooling the heat exchanger 520. When the verification box 300 needs to be heated, the heating device 540 heats the heat exchanger 520, and after the verification box 300 is heated to a proper temperature, the fan 322 installed at the air outlet drives the air in the verification box 300 to be discharged from the verification box 300, and the air exchanges heat with the heat exchanger 520 to be heated. The heated air is mixed in the airflow channel 203, so that the air is heated uniformly, and then flows back into the verification box through the air inlet 362, thereby realizing the heating operation of the verification box 300. Similarly, when the verification box 300 needs to be cooled, the refrigerating device 560 is right the heat exchanger 520 is refrigerated, after being refrigerated to a proper temperature, the air outlet is installed at the air outlet for driving the fan 322 the air in the verification box 300 is discharged from the verification box 300, and the heat exchanger 520 carries out heat exchange and is cooled after heat prevention. The air after the cooling is in airflow channel 203 internal mixing for the air cooling is even, then by air intake 362 flows back extremely in the verification case, and then realize right the cooling operation of verification case 300. It should be noted that, in this embodiment, the heating device 540 may be an electric heating device or a water circulation heating device; and the refrigeration unit 560 is preferably a water cycle refrigeration unit 560.
Further, in this embodiment, the temperature adjustment device may further include a compressor, two throttle valves, and two heat exchangers connected by pipelines. The principle of the refrigeration and heating of the temperature adjusting device is the same as that of an air conditioner, and the details are not repeated.
As shown in fig. 1 to 6, the temperature compensation device 600 is used to compensate the temperature of the air entering the verification box 300 through the pressure adjustment device 400, so as to ensure the stability of the constant temperature and pressure verification device.
Specifically, the structure of the temperature compensation device 600 may be similar to that of the temperature adjustment device 500, or may be a simplified version of the temperature adjustment device 500. Specifically, for example, when the temperature adjustment device 500 is a water circulation temperature adjustment device 500 (including a water circulation heating device and a water circulation cooling device 560), the temperature compensation device 600 is installed outside the sealed box 200, and includes a liquid storage box 620 and a coil 640 having a serpentine shape, one end of the coil 640 is respectively communicated with the first air pipe 364 and the second air pipe 366 through a tee joint, and the other end is communicated with the verification box 300. The liquid storage tank 620 is communicated with a water pipe in the heat exchanger 520, so that water in the heat exchanger 520 can enter the liquid storage tank 620. Since the temperature of the water inside the heat exchanger 520 is comparable to the temperature of the heat exchanger 520; since the temperature of the air in the certification box 300 corresponds to the temperature of the heat exchanger 520, the temperature of the water introduced into the liquid storage tank 620 corresponds to the temperature of the air in the certification box 300. When the air that is got into by first trachea 364 or second trachea 366 passes through during the coil pipe 640, with the water in the liquid storage box 620 carries out the heat exchange, and the realization is right the heating or the refrigeration of air, so that the temperature of the air in the coil pipe 640 with after the temperature in the verification box 300 is equal, reentry in the verification box 300, can not cause very big influence to the temperature of the air in the verification box 300, promptly, can not cause very big fluctuation for the temperature in the verification box 300, and then guaranteed the stability of constant temperature and constant pressure verification box 300.
Further, as shown in fig. 1 to 6, the constant temperature and constant pressure calibrating apparatus further includes a monitoring device (not shown) and a control device (not shown); the monitoring device is used for monitoring the temperature and the pressure in the verification box 300, and the control device controls the pressure adjusting device 400, the temperature adjusting device 500 and the temperature compensating device 600 to adjust the temperature and the pressure in the verification box 300 in time according to the input of a user and the monitoring result of the monitoring device.
Specifically, for example, when the assay chamber 300 needs to be pressurized and the temperature needs to be maintained. The control cabinet device controls the first pressurizing device 420, the first flow rate adjusting device 440, and the temperature compensating device 600 to be activated to compensate the temperature of the external air, and then to press the external air into the certification box 300, thereby adjusting the amount of air introduced into the certification box 300. Meanwhile, the second flow regulator 480 is controlled such that a small amount of air in the verification box 300 can be exhausted through the second air pipe 366, and thus the pressure in the verification box 300 can be increased slowly, thereby avoiding the situation of excessive temperature change caused by too fast pressure increase. Temperature changes in the chamber may also occur due to the pressure rise in the calibration box 300. When the monitoring device detects that the temperature in the verification box 300 changes, the temperature adjusting device 500 is started to adjust the temperature in the verification box 300.
Similarly, when the temperature of the verification box 300 needs to be raised and the pressure is not changed, the temperature adjusting device 500 is started to raise the temperature of the air in the verification box 300, and the pressure of the verification box 300 increases while the temperature is raised, so that the pressure adjusting device 400 is started to properly exhaust the verification box 300.
According to the technical scheme of the embodiment, the temperature adjusting device 500 and the pressure adjusting device 400 are reasonably integrated, so that the temperature and the pressure in the verification box 300 can be effectively guaranteed to be constant, verification can be completed through one verification device, and the verification efficiency is high; meanwhile, the influence of temperature change on pressure and the influence of pressure change on temperature can be effectively reduced; and through setting up temperature compensation arrangement 600, can effectively reduce outside air and enter into the verification case 300 in, the temperature fluctuation that causes has guaranteed constant temperature and constant pressure calibrating installation's stability, and then has effectively promoted verification efficiency, has reduced the examination cost.
The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.
Claims (10)
1. A constant temperature and constant pressure calibrating device is characterized by comprising a seal box, a calibrating box, a pressure regulating device and a temperature regulating device; wherein,
the seal box is used for sealing the verification box, and an air flow channel for air circulation is formed between the seal box and the verification box;
the detection box is arranged in the seal box and used for accommodating equipment to be detected;
the pressure adjusting device is used for adjusting the pressure in the verification box, so that the pressure in the verification box can be adjusted and can be kept constant;
the temperature adjusting device is used for adjusting the temperature in the verification box, so that the temperature in the verification box can be adjusted and can be kept constant.
2. The apparatus according to claim 1, wherein the detection box comprises a bottom plate, a top plate disposed opposite to the bottom plate, and a plurality of side plates disposed between the bottom plate and the top plate and connected in sequence; the bottom plate is provided with an air outlet, and the air outlet is provided with a fan; the top end of the side plate is provided with an air inlet communicated with the air outlet; the two side plates which are oppositely arranged are respectively provided with a first air pipe and a second air pipe which are communicated with the verification box; the first air pipe and the second air pipe penetrate through the seal box and extend out of the seal box.
3. The apparatus according to claim 2, wherein the pressure regulating device comprises a first pressure increasing device and a first flow regulating device disposed on the first gas pipe, and a second pressure increasing device and a second flow regulating device disposed on the second gas pipe.
4. The apparatus according to claim 3, wherein the first pressurizing means starts external air from the first air tube into the verification box when the internal pressure of the verification box needs to rise; the first flow regulating device regulates the flow of air in the first air pipe to control the amount of air entering the verification box; the air in the verification box is discharged out of the verification box through the second air pipe, the second flow regulating device regulates the flow of the air in the second air pipe so as to control the discharge of the air quantity of the verification box and ensure that the air quantity entering the verification box is larger than the discharge of the air quantity of the verification box.
5. The apparatus according to claim 3, wherein the second pressurizing means starts external air from the second air tube into the certification box when the internal pressure of the certification box needs to be reduced; the second flow regulating device regulates the flow of air in the second air pipe to control the amount of air entering the verification box; the air in the verification box is discharged out of the verification box through the first air pipe, and the first flow regulating device regulates the flow of the air in the first air pipe so as to control the amount of the air discharged out of the verification box and ensure that the amount of the air entering the verification box is smaller than the amount of the air discharged out of the verification box.
6. The apparatus according to claim 2, wherein the temperature adjustment device comprises a heat exchanger, a heating device and a cooling device; the heat exchanger is arranged below the verification box and corresponds to the position of the air outlet, and the heating device is used for heating the heat exchanger; the refrigerating device is used for refrigerating the heat exchanger; the air in the verification box is discharged from the air outlet under the action of the fan, is uniformly mixed in the airflow channel after exchanging heat with the heat exchanger, and finally flows back into the verification box from the air inlet.
7. The apparatus according to claim 2, further comprising a temperature compensation means for compensating the temperature of the air introduced into the certification box through the pressure adjustment means.
8. The apparatus according to claim 7, wherein the temperature compensation device comprises a liquid storage tank and a serpentine coil; liquid for adjusting the temperature in the coil pipe is stored in the liquid storage tank; one end of the coil pipe is respectively communicated with the first air pipe and the second air pipe through a tee joint, and the other end of the coil pipe is communicated with the verification box; the air entering the coil pipe through the first air pipe or the second air pipe enters the verification box after being heated or cooled by the liquid.
9. The apparatus according to claim 2, wherein the top plate is made of a transparent material; the side plates are detachably provided with cabin doors for opening or closing the verification box.
10. The apparatus according to any one of claims 1 to 9, further comprising a housing; the sealing box and the temperature regulating device are both arranged in the shell; and the bottom of the shell is provided with rollers.
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| CN201820234222.3U CN207964163U (en) | 2018-02-09 | 2018-02-09 | Constant temperature and pressure calibrating installation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820234222.3U CN207964163U (en) | 2018-02-09 | 2018-02-09 | Constant temperature and pressure calibrating installation |
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| CN207964163U true CN207964163U (en) | 2018-10-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108279089A (en) * | 2018-02-09 | 2018-07-13 | 深圳市艾依康仪器仪表科技有限公司 | Constant temperature and pressure calibrating installation |
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2018
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108279089A (en) * | 2018-02-09 | 2018-07-13 | 深圳市艾依康仪器仪表科技有限公司 | Constant temperature and pressure calibrating installation |
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