A liquid working medium barrel filling method with high reliability

Abstract

The present application relates to a kind of liquid working medium barrel filling method, belong to filling equipment method technical field, solve the problem that piston can occur lateral tilting and cause the uneven compression of the sealing ring on piston when liquid working medium is filled into barrel in prior art.A kind of liquid working medium barrel filling method, characterized in that, specific steps include: step 1: install liquid working medium cylinder, and vacuumize;Step 2: inject liquid working medium into filling cylinder;Step 3: filling is completed.The filling method of the liquid working medium barrel of the present application avoids the problem that piston occurs lateral tilting and causes the uneven compression of the sealing ring on piston during filling process.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical imaging technology, and particularly relates to a liquid working medium barrel filling method. BACKGROUND

[0002] In a space life support system, liquid working medium is injected into the system to make the system work normally. The liquid working medium needs to be constantly replenished as a consumable, and as a ground support personnel, a barrel product filled with liquid working medium needs to be produced so as to be transported to a space station.

[0003] The ground support personnel generally fills the liquid working medium into a filling barrel, and then sends the filling barrel filled with the liquid working medium to space through a rocket spaceship.

[0004] In the production process, when the liquid working medium barrel filling fills the liquid working medium into the filling barrel, the piston will tilt due to the lack of guidance, causing dry friction between the piston and the filling cylinder, and causing the piston and the filling cylinder to be worn and deformed. In severe cases, the circumferential compression of the sealing ring on the piston will be uneven, the local compression rate of the sealing ring will be too large, the sealing ring material will fall off, and excess material will be introduced into the inside of the filling barrel. SUMMARY

[0005] In view of the above analysis, the present application aims to provide a liquid working medium barrel filling method to solve the problem that the piston will tilt to cause uneven circumferential compression of the sealing ring on the piston when the liquid working medium is filled into the barrel in the prior art.

[0006] The main purpose of the present application is achieved by the following technical solutions:

[0007] A liquid working medium barrel filling method, the specific steps comprising:

[0008] Step 1: install the liquid working medium cylinder and vacuumize;

[0009] Step 2: inject liquid working medium into the filling cylinder;

[0010] Step 3: filling is completed.

[0011] Further, in the step 1, the piston, the plurality of pads and the top pad are placed in the filling cylinder.

[0012] Further, in the step 1, the filling cylinder is placed in the filling cylinder fixing seat, so that the filling passage arranged below the filling cylinder is accommodated in the U-shaped opening of the bottom mounting table.

[0013] Further, in the step 1, the vacuum pump is communicated with the disconnecting device.

[0014] Further, in the step 1, the filling cylinder is vacuumized by a vacuum pump, and after the vacuumization is completed, the disconnecting device is removed.

[0015] Further, in the step 2, the liquid working medium is introduced into the connector and communicated with the disconnecting device.

[0016] Further, in the step 2, the liquid working medium is injected into the filling cylinder through the disconnecting device and the filling channel in sequence.

[0017] Further, in the step 2, the multiple pads are removed from top to bottom in sequence.

[0018] Further, in the step 3, after all the pads are removed, the final filling is performed until the upper surface of the top pad abuts against the lower surface of the top support table.

[0019] Further, in the step 3, the liquid working medium introduction connector is removed from the disconnecting device, the disconnecting device is automatically sealed, and the filling is completed.

[0020] Compared with the prior art, the present application can achieve at least one of the following beneficial effects:

[0021] (1) In the liquid working medium barrel filling method of the present application, the filling cylinder is vacuumized, the bottom of the piston is in parallel contact with the inner bottom surface of the filling cylinder, the vacuumized filling cylinder is placed on the fixing seat, the liquid working medium is injected into the filling cylinder from the bottom of the filling cylinder, and the liquid working medium injected into the filling cylinder can drive the piston to slide upward. The filling device can prevent the liquid from being contaminated by any impurities, and the injection method can avoid the liquid working medium from being shaken to maintain its stability, thereby improving the reliability.

[0022] (2) The piston, the pads and the top pad are placed in the filling cylinder from bottom to top in sequence, and multiple pads are placed on the piston in parallel with the top pad. The diameters of the pads and the top pad are coaxially arranged with the piston, and the diameters of the pads and the top pad are arranged in parallel with the piston. The pads arranged on the piston in parallel are tightly attached to the upper surface of the piston, and the multiple pads can exert a vertical downward pressure on the piston perpendicular to the bottom of the filling cylinder. The pressure of the pads on the piston enables the pads to guide the movement of the piston in the filling cylinder, ensures the coaxiality of the piston and the filling cylinder, ensures the parallelism of the piston and the bottom surface of the filling cylinder, and avoids the inclination of the piston.

[0023] (3) The piston of the present application has a guiding effect on the movement direction of the piston in the filling cylinder when driving the upper pad to move synchronously, which ensures the coaxiality between the pad and the filling cylinder. Since the upper surface of the piston and the lower surface of the pad are closely combined, the coaxiality between the piston cylindrical surface and the filling cylinder cylindrical surface is further ensured, which further ensures the parallelism between the piston, the filling cylinder bottom surface and the pad, avoids the piston from tilting inside the filling cylinder, and causes the friction between the piston and the filling cylinder to generate abrasive dust. At the same time, the guiding effect reduces the probability of abrasive ring wear and deformation, avoids the local compression rate of the sealing ring being too large, avoids the problem of abrasive ring wear and shedding during the piston rising process, thereby avoiding the introduction of foreign matter into the filling cylinder during the filling process.

[0024] (4) When the upper surface of the top pad is in contact with the lower surface of the top support table during the filling process, the liquid working medium can no longer be injected, i.e. the injection is completed, so that the liquid quantity in the filling cylinder reaches the quantitative effect, which is convenient for batch production.

[0025] In the present application, the above technical solutions can be combined with each other to realize more preferred combination schemes. Other features and advantages of the present application will be described in the subsequent specification, and some advantages will become apparent from the specification or by implementing the present application. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings are included to provide a further understanding of the embodiments, and are incorporated in and constitute a part of this specification, illustrate embodiments of the application, and together with the description serve to explain the principles of the application, and should not be considered limiting of the present application in scope, as numerous embodiments can be made without departing from the scope of the present application.

[0027] Figure 1 is a sectional view of the liquid working medium barrel before filling according to the present application;

[0028] Figure 2 is a closed state diagram of the disconnector of the liquid working medium barrel according to the present application;

[0029] Figure 3 is an open state diagram of the disconnector of the liquid working medium barrel according to the present application;

[0030] Figure 4 is a schematic diagram of the filling cylinder fixing seat in the liquid working medium barrel according to the present application;

[0031] Figure 5 is a sectional view of the liquid working medium barrel after filling according to the present application.

[0032] Reference Signs:

[0033] 1-filling cylinder; 11-filling channel; 12-disconnector; 121-housing; 122-sliding core; 123- support; 124-spring; 2-piston; 21-sealing rubber ring; 22-spiral hole; 3-pad; 4-top pad; 41-spiral through hole; 5-filling cylinder fixing seat; 51-arc wall; 52-top support table; 53-bottom mounting table; 54-scale pin. DETAILED DESCRIPTION

[0034] The liquid working medium barrel filling method is further described in detail below in combination with specific embodiments, which are only used for comparison and explanation purposes, and the present application is not limited to these embodiments.

[0035] Embodiment 1

[0036] In one specific embodiment of the present application, a liquid working medium barrel filling method is disclosed, and the specific steps include:

[0037] Step 1: install the liquid working medium cylinder and vacuumize;

[0038] Step 1 includes the following steps:

[0039] Step 11: as shown in Figure 1 and Figure 4 , the piston 2, the pad 3 and the top pad 4 are placed in the filling cylinder 1;

[0040] Before filling the liquid working medium, the piston 2 is placed in parallel at the bottom of the filling cylinder 1, so that the sealing rubber ring 21 is in contact with the inner wall of the filling cylinder 1, thereby achieving the sealing effect. Then, multiple pads 3 are placed above the piston 2 in the filling cylinder 1, and the top pad 4 is placed on the uppermost pad 3. The overall height of the piston 2, the multiple pads 3 and the top pad 4 is less than the distance difference between the top support table 52 and the bottom mounting table 53 of the filling cylinder fixing seat 5, so as to facilitate the placement of the filling cylinder 1 with the piston 2, the pad 3 and the top pad 4 in the filling cylinder fixing seat 5.

[0041] Step 12: place the filling cylinder 1 in the filling cylinder fixing seat 5;

[0042] Since the circular arc of the arc-shaped wall 51 of the filling cylinder fixing seat 5 is the same as that of the filling cylinder 1, and the arc-shaped wall 51 and the filling cylinder 1 are coaxially arranged, the filling cylinder 1 can be quickly positioned on the filling cylinder fixing seat 5 through the arc-shaped wall 51, and the filling passage 11 arranged below the filling cylinder 1 is accommodated in the U-shaped opening of the bottom mounting table 53. The outer wall of the filling cylinder 1 and the inner part of the arc-shaped wall 51 are mutually attached, so that the filling cylinder 1 can be fixed relative to the filling cylinder fixing seat 5, that is, the filling cylinder 1 can be quickly positioned on the filling cylinder fixing seat 5 through the arc-shaped wall 51 of the filling cylinder fixing seat 5, so as to ensure that the bottom of the filling cylinder 1 can be arranged in parallel relative to the bottom mounting table 53, so that the filling cylinder 1 can maintain horizontal degree when being filled.

[0043] Step 13: as shown in the figure, the disconnector 12 is communicated with the vacuum pump; Figures 2-3

[0044] The vacuum pump is inserted into the disconnector 12, the sliding core 122 is subjected to external pressure of the vacuum pump interface, so that the sliding core 122 slides in the sliding pipe of the support 123, and the spring 124 is compressed at the same time, so that the sliding core 122 is separated from the opening of the shell 121, and the disconnector 12 is connected with the vacuum pump.

[0045] Step 14: vacuumize the filling cylinder 1;

[0046] The vacuum pump is started, and the inside of the filling cylinder 1 is vacuumized, so that the gas in the filling cylinder 1 is sucked into the vacuum pump along the inner cavity of the shell 121, and finally the upper surface of the top pad 4 is leveled with the uppermost end of the filling cylinder 1, or is higher than the uppermost end of the filling cylinder 1 and does not contact the top supporting table 52. The vacuum pump is removed, the spring 124 is naturally elongated to abut the sliding core 122 against the opening of the shell 121, so that the disconnector 12 is automatically sealed.

[0047] Step 2: inject liquid working medium into the filling cylinder 1;

[0048] Step 2 includes the following steps:

[0049] Step 21: connect the liquid working medium inlet with the disconnector 12;

[0050] The liquid working medium inlet is inserted into the disconnector 12, the sliding core 122 is subjected to external pressure of the vacuum pump interface, so that the sliding core 122 slides in the sliding pipe of the support 123, and the spring 124 is compressed at the same time, so that the sliding core 122 is separated from the opening of the shell 121, and the liquid working medium inlet is connected with the disconnector 12.

[0051] Step 22: inject liquid working medium into the filling cylinder 1;

[0052] ​The liquid working medium flows into the filling channel 11 through the inner cavity of the shell 121 of the disconnecting device 12, and then flows into the inside of the filling cylinder 1. The liquid working medium flowing into the filling cylinder 1 drives the upward movement of the piston 2, so that the cushion block 3 placed on the piston 2 moves upward synchronously. Under the action of gravity, the cushion block 3 gives the piston 2 downward pressure, and the upper surface of the piston 2 and the lower surface of the cushion block 3 are tightly combined. The multiple cushion blocks 3 can exert vertical downward pressure on the piston 2 perpendicular to the bottom of the filling cylinder 1. The pressure of the cushion blocks 3 on the piston 2 can guide the movement of the cushion blocks 3 on the piston 2 in the filling cylinder 1, ensuring the coaxiality of the piston 2 and the filling cylinder 1, that is, ensuring the parallelism of the piston 2 and the bottom surface of the filling cylinder 1.

[0053] The liquid working medium injected into the filling cylinder 1 can drive the piston 2 to slide upward, and the movement direction of the piston 2 is guided by the cushion block 3 and the top cushion block 4. This filling device can always keep the piston 2 parallel to the bottom of the filling cylinder 1, avoiding the problem of lateral tilting of the piston 2, and at the same time, this injection method can avoid the shaking of the liquid working medium and maintain its stability.

[0054] The upper limit size of the cylindrical diameter of the cushion block 3 is only slightly smaller than the lower limit size of the inner diameter of the filling cylinder 1, so that the lateral movement of the cushion block 3 is limited, ensuring the coaxiality between the cylindrical surface of the cushion block 3 and the cylindrical surface of the filling cylinder 1. Since the upper surface of the piston 2 and the lower surface of the cushion block 3 are tightly combined, the coaxiality between the cylindrical surface of the piston 2 and the cylindrical surface of the filling cylinder 1 is further ensured, so that the cushion block 3 guides the upward movement of the piston 2 in the filling cylinder 1. The piston 2 is prevented from tilting in the filling cylinder 1, reducing the risk of generating abrasive dust due to the friction between the piston 2 and the filling cylinder 1. At the same time, the local compression rate of the sealing rubber ring 21 is prevented from being too large, which causes the material of the sealing rubber ring 21 to wear off during the upward movement of the piston 2, and prevents the falling material (sealing rubber ring 21) from entering the filling cylinder 1 during the filling process, thereby introducing foreign matter.

[0055] Step 23: remove the uppermost cushion block 3;

[0056] With the increase of the volume of liquid working medium in the filling cylinder 1, the upper surface of the top layer of cushion block 4 will slide the scale pin 54 arranged on the top support table 52 outwards, and the operator can understand the upward movement of the top layer of cushion block 4 through the scale mark of the scale pin 54 exposed outside. When the scale pin 54 reaches the scale that requires the removal of the cushion block 3, stop filling, at this time the top layer of cushion block 4 is close to the lower surface of the top support table 52. From the removal of the filling cylinder 1, the scale pin 54 on the top support table 52 is lowered and restored to the original position through the limiting of the limiting piece. Remove the top layer of cushion block 4 from the filling cylinder fixing seat 5, remove the uppermost cushion block 3, and then put the top layer of cushion block 4 back into the filling cylinder 1, and finally place the filling cylinder 1 on the filling cylinder fixing seat 5. Only the uppermost cushion block 3 is removed, which does not affect the parallelism of the piston 2 and other cushion blocks 3, so as to ensure the parallelism of the piston 2 and the bottom of the filling cylinder 1.

[0057] Step 24: sequentially remove the remaining cushion blocks 3;

[0058] Repeat step 23 to continue filling the filling cylinder 1 and sequentially remove all the cushion blocks 3 arranged from top to bottom.

[0059] Step 3: filling is completed;

[0060] Step 3 includes the following steps:

[0061] Step 31: final filling;

[0062] As shown in Figure 5 When all the cushion blocks 3 are removed, the piston 2 is in direct contact with the top layer of cushion block 4, the filling cylinder 1 is placed back into the filling cylinder fixing seat 5, and the liquid working medium is continuously slowly filled into the filling cylinder 1, so that the upper surface of the top layer of cushion block 4 slowly approaches the lower surface of the top support table 52. At this time, the upper surface of the top layer of cushion block 4 will slide the scale pin 54 arranged on the top support table 52 upwards. When the scale pin 54 reaches the scale that requires stopping filling, stop filling the liquid working medium, at this time the upper surface of the top layer of cushion block 4 is in contact with the lower surface of the top support table 52, which ensures the parallelism of the piston 2 and the bottom of the filling cylinder 1, further reduces the probability of excessive local compression rate or excessive local friction force of the sealing rubber ring 21, and avoids the sealing rubber ring 21 from falling into the filling cylinder 1 due to wear and tear during the upward movement of the piston 2, which causes the introduction of excess material.

[0063] Step 32: remove the liquid working medium guide from the disconnecting device 12;

[0064] At the same time, when the upper surface of the top layer of cushion block 4 is in contact with the lower surface of the top support table 52, the liquid working medium cannot continue to be injected, so that the amount of liquid in the filling cylinder 1 reaches the quantitative effect, which is convenient for batch production.

[0065] The liquid working medium inlet joint is detached from the disconnecting device 12, the spring 124 naturally extends to press the sliding core 122 against the opening of the shell 121, so that the disconnecting device 12 is automatically sealed, and the liquid working medium is sealed in the filling cylinder 1.

[0066] Embodiment 2

[0067] As shown in the specific embodiment of the present application, Figure 1 a reliable liquid working medium barrel is disclosed for implementing the reliable liquid working medium barrel filling method of embodiment 1, which comprises a filling cylinder 1, a piston 2 and a filling cylinder fixing seat 5, the piston 2 is arranged in the interior of the filling cylinder 1, the diameter of the piston 2 is the same as the inner wall of the filling cylinder 1, the side wall of the piston 2 is in contact with the inner wall of the filling cylinder 1, and the piston 2 can reciprocate along the inner wall of the filling cylinder 1; the filling cylinder 1 is detachably installed in the filling cylinder fixing seat 5.

[0068] Further, the pad 3 and the top pad 4 are further included, the pad 3 is provided with a plurality of pads 3 arranged in parallel on the piston 2, and the top pad 4 is arranged on the pad 3.

[0069] Specifically, the pad 3, the top pad 4 and the piston 2 are coaxially arranged, and the diameters of the pad 3 and the top pad 4 are arranged in parallel with each other, so that the outer walls of the pad 3, the top pad 4 and the piston 2 are parallel to each other with the inner wall of the filling cylinder 1.

[0070] Specifically, the piston 2, the pad 3 and the top pad 4 are sequentially placed from bottom to top in the filling cylinder 1, so that the piston 2, the pad 3 and the top pad 4 are in parallel contact with the inner bottom surface of the filling cylinder 1.

[0071] Further, the filling cylinder 1 comprises a filling channel 11 and a disconnecting device 12. The filling cylinder 1 is a cylindrical cylinder, the filling channel 11 is an L-shaped channel protrudingly arranged at the bottom of the filling cylinder 1, one end of the filling channel 11 is communicated with the bottom of the filling cylinder 1; the other end of the filling channel 11 is fixedly connected with the disconnecting device 12 through a bolt.

[0072] Specifically, the filling channel 11 is connected with the lower surface of the bottom of the filling cylinder 1 and arranged at the central position of the filling cylinder 1, and coaxially arranged with the filling cylinder 1, so that when the liquid working medium is added into the interior of the filling cylinder 1, the pressure and pressure intensity of the liquid working medium entering the filling cylinder 1 container in each direction are equal, and the stability of the filling process is increased.

[0073] Further, as shown in the specific embodiment of the present application, Figures 2-3As shown, the disconnector 12 includes a housing 121, a sliding core 122, a support 123 and a spring 124. The housing 121 is internally provided with an inner cavity for accommodating the sliding core 122, the support 123 and the spring 124, while the inner cavity is a flow channel for the liquid working medium. The base of the support 123 is fixedly connected with the bottom of the housing 121, and a sliding pipe is formed at the axial center of the support 123, one end of the sliding core 122 being capable of reciprocating sliding in the sliding pipe, and the other end of the sliding core 122 being capable of sealingly connecting or separating with the opening of the housing 121. The support 123 is externally sleeved with the spring 124, one end of the spring 124 being capable of abutting against the sliding core 122.

[0074] Further, the piston 2 includes a sealing rubber ring 21 arranged on the outer wall of the piston 2, and the sealing rubber ring 21 plays a sealing role between the piston 2 and the filling cylinder 1.

[0075] Further, the cushion block 3 is provided with a circular through hole for reducing the weight of the cushion block 3 and facilitating the removal of the cushion block 3 from the filling cylinder 1.

[0076] Further, all sharp edges of the cushion block 3 are provided with chamfers, so as to avoid scratching the inner wall of the filling cylinder 1 during the movement of the cushion block 3, otherwise the liquid working medium will cause corrosion at the scratched part of the inner wall of the cylinder, resulting in internal roughness, causing the inclination of the piston 2 to cause dry friction between the piston 2 and the filling cylinder 1, and causing the inclination of the piston 2.

[0077] Further, the upper and lower surfaces of the cushion block 3 have a flatness of 0.1, the lower surface being the reference, and the parallelism of the upper surface relative to the reference is 0.1, so as to ensure the parallelism between the cushion block 3 and the piston 2.

[0078] Further, as shown, Figure 4 the filling cylinder fixing seat 5 includes an arc-shaped wall 51, a top supporting table 52 and a bottom mounting table 53, the top supporting table 52 being mounted on the upper end of the arc-shaped wall 51, the bottom mounting table 53 being mounted on the lower end of the arc-shaped wall 51, the top supporting table 52 and the bottom mounting table 53 being arranged in parallel with each other, and the arc-shaped wall 51 being arranged perpendicularly to the top supporting table 52 and the bottom mounting table 53.

[0079] In particular, the bottom mounting table 53 is a circular ring structure, one side of which is provided with a U-shaped opening capable of accommodating the filling channel 11 arranged below the filling cylinder 1. The arc-shaped wall 51 is a semicircular arc surface wall, the circular arc degree of the arc-shaped wall 51 being the same as that of the filling cylinder 1, and the arc-shaped wall 51 and the filling cylinder 1 being coaxially arranged.

[0080] Further, the top supporting platform 52 and the bottom mounting platform 53 in the filling cylinder fixing seat 5 have a height difference between the lower surface of the top supporting platform 52 and the upper surface of the bottom mounting platform 53, which is equal to the sum of the height of the filling cylinder 1 and the height of the top layer cushion block 4. The distance between the lower surface of the top supporting platform 52 and the upper surface of the filling cylinder 1 is equal to the thickness of the top layer cushion block 4.

[0081] Further, the filling cylinder fixing seat 5 further comprises a scale pin 54 for measuring the relative distance between the top layer cushion block 4 and the top supporting platform 52 in real time, so as to determine the filling condition of the liquid working medium in the filling cylinder 1. The scale pin 54 is slidingly connected in the pin hole of the top supporting platform 52, and when the top layer cushion block 4 goes up, it can contact the scale pin 54 and drive the scale pin 54 to slide synchronously in the pin hole.

[0082] Further, the scale pin 54 is fixedly connected with a limiting sheet above, and when the scale pin 54 moves downward, the limiting sheet can be limited on the upper surface of the top supporting platform 52.

[0083] Specifically, the scale pin 54 is provided with a scale line for measuring the upward distance of the top layer cushion block 4.

[0084] In this embodiment, the difference between the cushion block 3 and the top layer cushion block 4 lies in that the principles of action of the two are different. During the filling process, the cushion block 3 is limited in the filling cylinder 1 by the cylindrical diameter of the filling cylinder 1, so as to ensure the coaxiality between the cylindrical surface of the piston 2 and the cylindrical surface of the filling cylinder 1. The upper surface of the top layer cushion block 4 is in contact with the lower surface of the top supporting platform 52, so as to indirectly ensure the parallelism between the upper surface and the lower surface of the piston 2 and the bottom of the filling cylinder 1.

[0085] Further, the piston 2 further comprises a spiral hole 22, and the top layer cushion block 4 comprises a spiral through hole 41. The spiral hole 22 is arranged at the top axis of the piston 2 and does not pass through the bottom of the piston 2; the spiral through hole 41 is arranged at the axis of the top layer cushion block 4 and passes through the top layer cushion block 4. The spiral hole 22 and the spiral through hole 41 are coaxially arranged and have the same diameter, and an external threaded part can rotate through the spiral through hole 41 to reach the spiral hole 22, and after the top layer cushion block 4 and the piston 2 are fixedly connected, the top layer cushion block 4 and the piston 2 are taken out at the same time. Alternatively, the external threaded part can be connected with the spiral through hole 41 and the spiral hole 22 respectively, and the top layer cushion block 4 and the piston 2 are taken out respectively according to actual needs.

[0086] Specifically, since the top layer cushion block 4 needs to be removed and put back many times during the filling process, the spiral through hole 41 of the top layer cushion block 4 is through the circular hole on the cushion block 3, so as to achieve the effect of exhausting air when the top layer cushion block 4 is removed and put back, and ensure the parallelism between the cushion block 3 and the top layer cushion block 4.

[0087] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A method for dispensing liquid working fluid in drums, characterized in that, The specific steps include: Step 1: Install the liquid working fluid cartridge and evacuate it; place the piston (2), multiple pads (3) and top pad (4) inside the filling cylinder (1); place the filling cylinder (1) inside the filling cylinder fixing seat (5); the filling cylinder fixing seat (5) includes a top support platform (52) and a scale pin (54); the scale pin (54) is slidably connected in the pin hole of the top support platform (52), and the top pad (4) can contact the scale pin (54) when it moves upward; Step 2: Inject liquid working medium into the filling cylinder (1); as the volume of liquid working medium in the filling cylinder (1) increases, the upper surface of the top layer pad (4) will push the scale pin (54) slidably set on the top support platform (52) upward; when the scale pin (54) reaches the scale for removing the pad (3), stop filling; remove the top layer pad (4) from the filling cylinder fixing seat (5), remove the topmost pad (3), put the top layer pad (4) back into the filling cylinder (1), and finally place the filling cylinder (1) on the filling cylinder fixing seat (5); repeat the above process to continue filling the filling cylinder (1) and remove all the pads (3) set from top to bottom in sequence; Step 3: Filling complete.

2. The method for filling liquid working medium into drums according to claim 1, characterized in that, In step 1, the filling channel (11) provided below the filling cylinder (1) is accommodated in the U-shaped opening of the bottom mounting platform (53).

3. The method for filling liquid working medium into drums according to claim 2, characterized in that, In step 1, the vacuum pump is connected to the disconnector (12).

4. The method for filling liquid working medium into drums according to claim 3, characterized in that, In step 1, the filling cylinder (1) is evacuated by the vacuum pump. After the evacuation is completed, the disconnector (12) is removed.

5. The method for filling liquid working medium into drums according to claim 4, characterized in that, In step 2, the liquid working fluid is introduced into the connector and connected to the disconnector (12).

6. The method for filling liquid working medium into drums according to claim 5, characterized in that, In step 2, liquid working fluid is injected into the filling cylinder (1) sequentially through the disconnector (12) and the filling channel (11).

7. The method for filling liquid working medium into drums according to claim 1, characterized in that, In step 3, after all the pads (3) are removed, the final filling is carried out until the upper surface of the top pad (4) abuts against the lower surface of the top support platform (52).

8. The method for filling liquid working medium into drums according to claim 4, characterized in that, In step 3, the liquid working fluid inlet connector is removed from the disconnector (12), and the disconnector (12) automatically seals, completing the filling process.

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