CN1083940C - Multi-step pressure reducing apparatus and method - Google Patents

Abstract

A multi-stage decompression device includes: a conveyor for conveying a module that needs to be evacuated at a constant speed; a plurality of multi-stage decompression elements, which are connected with the above-mentioned modules, and when conveyed together with the modules , to reduce the internal pressure of the module; the conveying element, used to convey the above-mentioned multi-stage decompression element at the same speed as the above-mentioned module; the control element, used to control the above-mentioned conveyor, the above-mentioned multi-stage decompression element and the above-mentioned conveying element . The invention also relates to a multi-stage decompression method. According to the present invention, the productivity can be improved by automatically reducing the pressure in the mold, thereby reducing the manufacturing cost.

Description

Multi-stage decompression device and method

(1) Technical field:

This invention is related to the invention of US Patent Application No. 08/922,396, filed September 3, 1997, which is incorporated herein by reference.

The present invention relates to a multi-stage decompression device and method, more particularly, to a multi-stage decompression device and method used in a module that needs to be vacuumed, which can make the internal pressure of the module quickly reach an ideal of vacuum.

(two) background technology:

An air conditioner generally includes a heat exchanger and a compressor, and the heat exchanger or compressor is substantially vacuum state. Moisture or impurities remaining in the heat exchanger or compressor are removed through a depressurization process. Figures 1 and 2 show devices for reducing the internal pressure of a heat exchanger or compressor.

Fig. 1 is the perspective view of traditional decompression device 10, and Fig. 2 has shown the vacuum pump shown in Fig. 1, as shown in Fig. 1 and Fig. 2, traditional decompression device 10 comprises: a conveyer 14, is used for A plurality of modules 12 are conveyed at a constant speed; a plurality of vacuum pumps 16 are used to reduce the internal pressure of the modules 12 while moving at the same speed as the conveying speed of the modules 12; and a pump conveying device 20 for conveying Vacuum pump 16.

As shown in FIG. 2 , each vacuum pump 16 includes a vacuum hose 18 and a connector 19 for connecting the vacuum hose 18 to each module 12 . A vacuum hose 18 extends outward from the vacuum pump 16 through which air and impurities in the module 12 are discharged to the outside of the module 12 .

The pump conveyor 20 is provided with a crawler 22 along which the vacuum pump 16 is circulated at the same speed as the modules 12 are conveyed.

The procedure for reducing the internal pressure of the module 12 in a conventional pressure reducing device will be described below.

First, the module 12 is sent to the front end of the conveyor 14 by the conveyor 14 , and the vacuum pump 16 is sent to the front end of the pump conveying device 20 by the pump conveying device 20 . At this point, an operator connects the vacuum hose 18 to the module 12 . Next, the vacuum pump 16 lowers the internal pressure of the mold 12, so that impurities therein are removed while being conveyed at the same speed as the mold 12 is conveyed.

The inside of the module 12 becomes a vacuum state by the vacuum pump 16, and when the module 12 and the vacuum pump 16 reach the rear of the pump delivery device 20, the operator disconnects the vacuum hose 18 and the module 12.

Then, the modules 12 are conveyed to the next production line, and the vacuum pump 16 returns along the crawler belt 22 of the pump conveying device 20 to its front end.

However, according to the above-mentioned so-called continuous decompression method, the productivity is very low, and since it takes a long time to obtain a desired vacuum degree, the required decompression production line is very long, and the number of vacuum pumps required is large, so the manufacturing cost increases.

In addition, there is a multi-stage decompression method in which a desired degree of vacuum is obtained by repeatedly connecting and disconnecting the vacuum pump 16.

However, according to this multi-stage decompression method, since the connection and detachment of the vacuum pump and the module are manual operations, multiple operators are required, thereby reducing productivity.

(3) Contents of the invention:

The present invention aims to overcome the above-mentioned problems in the prior art. Therefore, the purpose of the present invention is to provide a multi-stage decompression device, which can vacuumize the inside of the module in a short time, can reduce the number of operators, and increase productivity.

Another object of the present invention is to provide a multi-stage decompression method, which can evacuate the inside of the mold in a short time, reduce the number of operators, and increase productivity.

In order to achieve the above object, the present invention provides a multi-stage decompression device, which includes: a conveyor for conveying the molds that need to be evacuated at a constant speed; A connecting part for reducing the internal pressure of the module when it is conveyed together with the module; a conveying part for conveying the multi-stage decompression part at the same speed as the module; and a control part for controlling the conveyor, Multi-stage decompression parts and delivery parts.

According to the present invention, each multi-stage decompression unit includes a vacuum pump and a booster pump, the vacuum pump is used for the first-stage pressure reduction in the module, and the booster pump is used for the second-stage pressure reduction in the module. When the internal pressure of the module reaches a first predetermined pressure, the booster pump starts to operate.

The pressure inside the module is detected by a sensor and displayed on a pressure gauge. When the module and the multi-stage decompression part are disassembled, the internal pressure of the module is compared with a second predetermined pressure, so that the vacuum state of the module is displayed.

In order to achieve another object of the present invention, the present invention provides a multi-stage decompression method, which includes the following steps: connecting a decompression component and a module; carrying out one-stage decompression inside the module; when the internal pressure of the module reaches When a first predetermined pressure is reached, the second stage of decompression is carried out in the module, and the first predetermined pressure is displayed.

According to the features of the present invention, an ideal vacuum can be obtained in the mold after decompression, and impurities in the mold can be effectively removed.

In addition, the productivity can be improved by automatically reducing the pressure inside the mold, the reduction of operators can reduce the manufacturing cost, and the cost of manufacturing equipment can also be reduced.

(4) Description of drawings:

The present invention can be better understood and its various objects and advantages will be more apparent through the following detailed description with reference to the accompanying drawings. These drawings include:

Figure 1 is a perspective view of a conventional continuous decompression device;

FIG. 2 is a schematic diagram for explaining the vacuum pump shown in FIG. 1;

Fig. 3 is a perspective view of a multi-stage decompression device in a preferred embodiment of the present invention;

Fig. 4 is a schematic diagram for explaining the multistage vacuum pump shown in Fig. 3;

Figure 5 is a schematic diagram of an apparatus for extracting moisture from a vacuum module.

(5) Specific implementation methods:

FIG. 3 is a perspective view of a multi-stage decompression device 100 in a preferred embodiment of the present invention, and FIG. 4 is a schematic diagram for explaining the structure of the multi-stage decompression unit 110 shown in FIG. 3 .

As shown in FIGS. 3 and 4 , a multi-stage decompression device 100 in a preferred embodiment of the present invention includes a multi-stage decompression unit 110 and a delivery unit 130 . The multi-stage decompression device 100 is respectively connected with the modules 102 (such as compressors) to be evacuated, so as to evacuate the inside thereof; the conveying part 130 is used for conveying the multi-stage decompressing parts 110 separated from each other by a certain distance.

The modules 102 have a certain distance from each other, and are conveyed at a constant speed by the conveyor 104. The gap between the multi-stage decompression parts 110 is the same as the gap between the modules 102, and the same as the conveying module 102 by the conveying part 130. The conveyor 104 and the conveying part 130 are synchronously controlled by a controller 140 so that the mold 102 and the multi-stage decompression part 110 are conveyed at the same speed.

Each decompression unit 110 is controlled by a controller 140 , which includes a vacuum pump 112 , a connector 114 and a booster pump 116 . The vacuum pump 112 carries out one-stage decompression in the module 102 by discharging the air and impurities in the module 102, the connector 114 connects the vacuum pump 112 and the module 102, and the booster pump 116 connects with the vacuum pump 112, when the inside of the module 102 When the pressure reaches a first predetermined pressure, it depressurizes the inside of the module 102 in two stages.

Air, moisture and impurities are exhausted through the vacuum hose 118 of the vacuum pump 112 . A sensor 119 is installed on the vacuum hose 118 for detecting the above-mentioned first predetermined pressure and a second predetermined pressure in the module 102 . The booster pump 116 is provided between the vacuum hose 118 and the vacuum pump 112 and is connected to each other, and it starts to operate when the sensor 119 detects a first predetermined pressure (preferably 50 Torr). When the booster pump 116 and the vacuum pump 112 operate together, the pressure in the module 102 drops sharply, substantially to a vacuum state, preferably a second predetermined pressure, more preferably between eg 0.2 Torr to 0.4 Torr.

The decompression part 110 is equipped with a pressure gauge 120 and a plurality of lamps 122. The pressure gauge 120 is used to display the first and second predetermined pressures detected by the sensor 119. The lamps 122 are used to display whether the vacuum state of the module is normal. When the internal pressure of the module 102 is higher than the second predetermined level (that is, the predetermined vacuum state is not obtained), the lamp 122 shows an abnormal vacuum state by turning on a red light, and when the internal pressure of the module 102 is lower than or equal to the second predetermined level (ie, the desired vacuum state has been reached), the light 122 indicates a normal vacuum state by turning on a blue light. Therefore, the operator can recognize whether the vacuum state of the module 102 is normal.

The description of the delivery member 130 used to deliver the decompression member 110 is omitted here because it has been described in U.S. Patent Application No.08/922,396 filed September 3, 1997, which is cited here Reference.

The method for decompressing the mold 102 by utilizing the multistage decompression device 100 in a preferred embodiment of the present invention includes the following steps: conveying the mold 102 and the decompression part 110 at the same speed as each other; Flexible pipe 118 is connected with module 102; By using vacuum pump 112, the internal pressure of module 102 is reduced to a first predetermined pressure; When the internal pressure of module 102 reaches the first predetermined pressure, while showing the first predetermined pressure, by Operate the booster pump 116 to carry out secondary decompression in the module 102, and the decompression part 110 is disassembled from the module 102; Displays the vacuum state of the module 102.

The operation of the multi-stage pressure reducing device 100 will be described below with reference to a preferred embodiment of the present invention.

The modules 102 to be evacuated are transported by the conveyor 104 at a certain interval and speed, and the decompression unit 110 is transported by the transport unit 130 at the same interval as the modules 102 and at the same speed as the transport speed of the modules 102 . The operator connects the pressure relief component 110 to the module 102 via the connector 114 . At this time, the vacuum pump 112 starts to operate, and a first-stage depressurization is performed in the module 102 .

When the sensor 119 detects that the internal pressure of the module 102 reaches a first predetermined pressure, the pressure gauge 120 displays the first predetermined pressure, and then, the booster pump 116 starts to operate. The module 102 is subjected to two-stage decompression through the booster pump 116, so the impurities in the module 102 are discharged.

After a predetermined time elapses, the module 102 and the decompression member 110 are disassembled, and the internal pressure of the module 102 is displayed on the pressure gauge 120 . At this time, the internal pressure of the module 102 is compared with the second predetermined pressure, and then, the vacuum state of the module is displayed on the lamp 122 .

Then, the module 102 that has completed the decompression process is transported to a subsequent process, such as adding a coolant. At this time, the multi-stage decompression unit 110 installed on the transport unit 130 passes through the transport unit 130 and is sent to the next module 102 to be vacuumed for use.

Table 1 and Table 2 at the end of this specification respectively show the experimental data measured when using the multi-stage decompression device 100 of the present invention and a traditional decompression device for decompression.

In these Tables, Sample 1 and Sample 2 in Table 1 are large capacity modules, and Sample 3, Sample 4 and Sample 5 in Table 2 are low capacity modules.

As shown in Table 1 and Table 2, the multistage decompression device 100 of the present invention has reduced the time required for reducing the internal pressure of the module 100, and meanwhile, it has also improved the cooling capacity, energy consumption, effective coefficient and model of the module. Part vacuum.

Fig. 5 shows that in an extractor 150, after the module is decompressed by the conventional continuous decompression method, the conventional multi-stage decompression method, the non-vacuum method and the multi-stage decompression method of the present invention, the extractor 150 is used to extract moisture retained in the module. The experiment of extracting residual moisture in each module was performed by connecting each module to an extractor 150, as shown in FIG. 5 .

First, the modules that have been decompressed by the multi-stage decompression method of the present invention, the conventional continuous decompression method, the conventional multi-stage decompression method and the conventional non-vacuum method are heated in a drying oven 152 at 130° C. for two times. Hours. In order to extract the moisture, each heated module is depressurized in the vacuum pump 154 for one hour, and the moisture is released from the first, second, third and fourth heat-resistant parts (PYREX) 158 in the freezer 156 of -70 ° C. pull out.

Table 3 at the end of this specification shows the vacuum pumped from each module that has been evacuated by the multi-stage depressurization method of the present invention, the traditional multi-stage depressurization method, the traditional continuous depressurization method and the traditional non-vacuum method. moisture data.

As shown in Table 3, the amount of moisture extracted from the modules evacuated by the multi-stage decompression method of the present invention was less than that from the modules evacuated by other methods. It shows that the ability to remove impurities by the multi-stage decompression method of the present invention is higher than that of other decompression methods.

As described above, according to the present invention, when the vacuumed module is depressurized, a desired vacuum degree can be obtained in a short time, and impurities in the module can be effectively removed.

In addition, the automatic module decompression method improves productivity, reduces the number of operators and reduces manufacturing costs, and the cost of manufacturing equipment can also be reduced.

While the present invention has been described and illustrated in detail, it must be understood that they are presented as examples only and not as limitations of the invention, the spirit and scope of which are defined by the appended claims.

Table 1 Sample 1 Sample 2 Traditional 9.5 minutes Invention 5 minutes Traditional 9.5 minutes Invention 5 minutes SPL1 SPL2 SPL1 SPL2 SPL1 SPL2 SPL1 SPL2 Cooling capacity kcal/hour 6263 6254 6335 6256 7033 7061 7104 7105 % 102.7 102.5 103.9 102.6 99.1 99.5 100.1 98.1 Power Consumption (Watts) 2248 2238 2258 2230 2657 2664 2660 2662 EERkcal/Wh 2.787 2.795 2.806 2.806 2.647 2.65 2.67 2.635 Vacuum (Torr) high pressure 0.18 0.06 0.021 0.026 0.028 0.31 0.022 0.015 low pressure 0.63 0.72 0.042 0.056 0.059 0.68 0.049 0.033

Table 2 Sample 3 Sample 4 Sample 5 traditional 15 minutes Invention 5 minutes traditional 15 minutes Invention 5 minutes traditional 15 minutes Invention 5 minutes SPL1 SPL2 SPL1 SPL2 SPL1 SPL2 SPL1 SPL2 SPL1 SPL2 SPL3 SPL1 SPL2 Cooling capacity kcal/hour 1762 1744 1806 1795 2968 3012 2989 3018 3468 3443 3478 3456 3491 % 97.9 96.9 100.4 99.7 106.0 107.6 106.8 107.8 97.7 97.0 98.0 97.4 98.4 energy consumption (w) 2049 2028 2100 2087 1013 1008 1013 1017 1331 1326 1323 1321 1328 kcal/Wh 2.666 2.656 2.768 2.746 2.929 2.987 2.952 2.968 2.605 2.596 2.629 2.616 2.628 Vacuum (Torr) high pressure 0.18 0.08 0.024 0.021 0.13 0.04 0.025 0.028 0.13 0.13 0.14 0.028 0.024 low pressure 0.03 0.01 0.013 0.008 0.01 0.05 0.014 0.013 0.12 0.01 0.04 0.013 0.012

Table 3 Unit: Gram

Claims (7)

1. A multi-stage decompression device comprising: a conveyor for conveying the modules to be evacuated at a constant speed; A plurality of multi-stage decompression elements, which are connected to the module and are used to reduce the internal pressure of the module when delivered together with the module; a transport element for transporting the multi-stage pressure relief element at the same speed as the modules; A control element for controlling the conveyor, the multi-stage pressure relief element and the conveying element. 2. The multi-stage decompression device of claim 1, wherein the mold and the multi-stage decompression element are conveyed at the same speed as each other. 3. The multi-stage decompression device according to claim 1, wherein each multi-stage decompression element comprises: A vacuum pump is used to carry out a first-stage decompression to each of the modules; A vacuum hose is connected with the modules; a connector for connecting said vacuum hose to said modules; and A booster pump, which is connected with the vacuum pump, is used to depressurize the modules in two stages when the internal pressure of the modules reaches a first predetermined pressure. 4. The multi-stage decompression device according to claim 3, wherein each multi-stage decompression element further comprises: a sensor mounted on said vacuum hose for detecting said first predetermined pressure and a second predetermined pressure; a pressure gauge for displaying said first and second predetermined pressures; and a lamp for displaying the degree of vacuum when depressurization is completed, thereby displaying a normal vacuum state when the internal pressure of the module is lower than or equal to a second predetermined pressure, and displaying a normal vacuum state when the internal pressure of the module is high At the second predetermined pressure, an abnormal vacuum state is displayed. 5. The multi-stage pressure reducing device of claim 4, wherein the first predetermined pressure is about 50 Torr. 6. The multi-stage pressure reducing device of claim 4, wherein the second predetermined pressure is within a range of 0.2 Torr and 0.4 Torr. 7. A multi-stage decompression method comprising the steps of: The modules to be evacuated and the multi-stage decompression elements for reducing the pressure are conveyed at the same speed as each other; connecting the multi-stage pressure relief element to the module; Carry out a first-stage decompression in the module; When the internal pressure of the module drops to the first predetermined pressure and the first predetermined pressure is displayed at the same time, a two-stage depressurization is performed in the module; disassembling the multi-stage pressure relief element and the module; and When the internal pressure of the module is higher than a second predetermined pressure, an abnormal vacuum state is displayed, and when the internal pressure of the module is lower than or equal to the second predetermined pressure, a normal vacuum state is displayed.

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