Hydraulic device for refrigerant filling and its working method

Abstract

This invention belongs to the technical field of general fluid working systems, specifically relating to a hydraulic device for refrigerant filling and its operating method. The hydraulic device for refrigerant filling includes: a controller, a reservoir, a piston rod, a filling amount adjustment mechanism, a hydraulic mechanism, and a displacement sensor. Before the hydraulic mechanism pushes the piston rod, the filling amount adjustment mechanism rotates to move the piston rod relative to the hydraulic mechanism, thereby adjusting the maximum volume of the reservoir. The controller drives the hydraulic mechanism to push the piston rod to its maximum distance, and the controller detects the movement distance of the piston rod through the displacement sensor to obtain the maximum volume of the reservoir, so that the filling amount adjustment mechanism adjusts the maximum volume of the reservoir to a set volume. This invention adjusts the relative position between the piston rod and the hydraulic mechanism through the filling amount adjustment mechanism, i.e., adjusts the maximum volume of the reservoir, to meet the requirement that the hydraulic device can fill a specified mass of refrigerant in a single operation under different temperature conditions.

Description

Technical Field

[0001] This invention belongs to the technical field of general fluid working systems, specifically relating to fluid pressure actuators, and more particularly to a hydraulic device for refrigerant filling and its working method. Background Technology

[0002] Heat exchangers are used in equipment such as refrigeration and air conditioning equipment, and liquid refrigerant needs to be added to heat exchangers.

[0003] To improve the efficiency of filling liquid refrigerant, i.e., adding liquid refrigerant in batches to heat exchangers, current filling equipment adds liquid refrigerant in a single fixed volume. However, the volume of liquid refrigerant can change dramatically due to slight temperature variations. Before the liquid refrigerant is added to the filling equipment, its temperature changes, causing traditional filling equipment to be unable to fill the required mass of liquid refrigerant in a single batch.

[0004] Therefore, there is an urgent need to develop a new hydraulic device and its working method for refrigerant filling, in order to solve the technical problem that the volume of liquid refrigerant added in a single filling is not adjustable in existing filling equipment, which leads to the substandard quality of liquid refrigerant in a single filling.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Summary of the Invention

[0006] This disclosure provides at least one hydraulic device for refrigerant filling and its operating method.

[0007] In a first aspect, embodiments of this disclosure provide a hydraulic device for refrigerant filling, comprising: a controller, a reservoir, a piston rod, a filling amount adjustment mechanism, a hydraulic mechanism, and a displacement sensor; wherein the reservoir has a reservoir chamber; the piston rod's pushing portion extends into the reservoir chamber, dividing the reservoir chamber into a reservoir space and a moving space; the piston rod's connecting portion is threadedly connected to the filling amount adjustment mechanism; the filling amount adjustment mechanism is rotatably connected to the hydraulic mechanism, the hydraulic mechanism is connected to the reservoir, and the displacement sensor is installed within the hydraulic mechanism; before the hydraulic mechanism pushes the piston rod, the filling amount adjustment mechanism is configured to rotate and move the piston rod relative to the hydraulic mechanism to adjust the maximum volume of the reservoir space; the controller is configured to drive the hydraulic mechanism to push the piston rod to the farthest distance, and the controller is also configured to detect the piston rod's movement distance using the displacement sensor to obtain the maximum volume of the reservoir space, so that the filling amount adjustment mechanism adjusts the maximum volume of the reservoir space to a set volume.

[0008] In one optional embodiment, the filling adjustment mechanism includes: an adjustment ring; the adjustment ring is threadedly connected to the piston rod, and the adjustment ring is rotatably connected to the hydraulic mechanism; when the adjustment ring rotates relative to the piston rod, the piston rod moves relative to the adjustment ring, that is, the piston rod moves relative to the hydraulic mechanism.

[0009] In one optional embodiment, the inner sidewall of the adjusting ring is provided with a first threaded portion, and the connecting portion of the piston rod is provided with a second threaded portion, and the first threaded portion and the second threaded portion are threadedly engaged, that is, the adjusting ring and the connecting portion of the piston rod are threadedly connected.

[0010] In one optional embodiment, the filling adjustment mechanism further includes: an annular sealing block and a plurality of first springs; a sealing ring groove is provided on the piston rod, the sealing ring groove being disposed toward the adjustment ring; the annular sealing block is connected to the sealing ring groove through each of the first springs, and the annular sealing block is disposed around the second threaded portion; the annular sealing block extends into the sealing ring groove, and the annular sealing block also elastically abuts against the adjustment ring to prevent impurities from contacting the second threaded portion.

[0011] In one optional embodiment, the push rod of the hydraulic mechanism is provided with a snap-fit ​​groove, the adjusting ring is provided with a snap-fit ​​part, the snap-fit ​​part is rotatably connected to the snap-fit ​​groove, and the push rod drives the piston rod to move through the adjusting ring.

[0012] In one optional embodiment, the hydraulic mechanism includes: a hydraulic housing and a push rod; the hydraulic housing is connected to a reservoir, and a movable cavity is provided inside the hydraulic housing; the movable part of the push rod extends into the movable cavity, so that the movable part divides the movable cavity into a first oil cavity and a second oil cavity; a first oil passage and a second oil passage are provided on the hydraulic housing, which are respectively connected to the first oil cavity and the second oil cavity; the push rod is rotatably connected to a filling adjustment mechanism; the first oil passage and the second oil passage are respectively connected to the first oil cavity and the second oil cavity to push the movable part to move within the movable cavity, so that the push rod drives the filling adjustment mechanism to move, thereby pushing the liquid pushing part to move within the reservoir cavity.

[0013] In one alternative embodiment, the magnet of the displacement sensor is located inside the push rod, and the waveguide wire of the displacement sensor extends into the push rod and passes through the magnet; the controller is configured to acquire ultrasonic pulses from the magnet on the waveguide wire to obtain the movement distance of the push rod, i.e., to obtain the movement distance of the piston rod.

[0014] In one optional embodiment, the liquid storage box is provided with an inlet channel and an outlet channel that communicate with the liquid storage space, and the inlet channel and the outlet channel are respectively connected to an inlet check valve and an outlet check valve.

[0015] In an optional embodiment, the hydraulic device for refrigerant filling further includes: a liquid outlet plug and several second springs; a limiting cavity is formed on the liquid storage box, the limiting cavity is connected to the liquid outlet channel, the limiting part of the liquid outlet plug is located in the limiting cavity, the limiting part is elastically connected to the limiting cavity through each of the second springs, the extension part of the liquid outlet plug extends into the liquid storage space through the liquid outlet channel, and the extension part is positioned towards the liquid pusher; a buffer channel is formed in the liquid outlet plug, and the buffer channel passes through the limiting part and the extension part; when the liquid pusher moves towards the extension part, the refrigerant in the liquid storage space flows to the liquid outlet check valve through the buffer channel and the liquid outlet channel, and the liquid pusher blocks the buffer channel after contacting the extension part, so as to gradually push the refrigerant in the buffer channel and the liquid outlet channel out of the liquid outlet check valve.

[0016] Secondly, this disclosure also provides a working method applicable to the hydraulic device as described above, comprising: before the hydraulic mechanism pushes the piston rod, the filling amount adjustment mechanism drives the piston rod to move relative to the hydraulic mechanism by rotation, so as to adjust the maximum volume of the liquid storage space; the controller drives the hydraulic mechanism to push the piston rod to the farthest distance, and the controller detects the moving distance of the piston rod through a displacement sensor to obtain the maximum volume of the liquid storage space, so that the filling amount adjustment mechanism adjusts the maximum volume of the liquid storage space to a set volume.

[0017] The beneficial effect of the present invention is that it adjusts the relative position between the piston rod and the hydraulic mechanism through the filling amount adjustment mechanism, that is, adjusts the maximum volume of the liquid storage space, so as to meet the requirement that the hydraulic device can fill a specified mass of refrigerant in a single operation under different temperature conditions.

[0018] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1A structural diagram of a hydraulic device for refrigerant filling provided in an embodiment of this disclosure; Figure 2 A cross-sectional view of a hydraulic device for refrigerant filling provided in an embodiment of this disclosure; Figure 3 Provided for the embodiments of this disclosure Figure 2 A magnified view of a section at point A in the middle; Figure 4 Provided for the embodiments of this disclosure Figure 2 A magnified view of a section at point B in the middle; Figure 5 A schematic diagram showing the state in which the liquid-pushing part is just in contact with the extension part, provided in an embodiment of this disclosure; Figure 6 This is a schematic diagram showing the state of the liquid-pushing part pushing the extension part to its farthest distance, provided in an embodiment of the present disclosure. Figure 7 A circuit control diagram of a hydraulic device for refrigerant filling is provided for an embodiment of this disclosure.

[0022] In the picture: 1. Liquid storage box; 11. Liquid storage chamber; 111. Liquid storage space; 112. Movement space; 12. Liquid inlet channel; 13. Liquid outlet channel; 14. Limiting cavity; 2. Piston rod; 21. Fluid-pushing part; 22. Connecting part; 221. Second threaded part; 3. Filling amount adjustment mechanism; 31. Adjusting ring; 311. First threaded part; 312. Snap-fit ​​part; 32. Annular sealing block; 33. First spring; 4. Hydraulic mechanism; 41. Hydraulic housing; 411. Movable cavity; 4111. First oil chamber; 4112. Second oil chamber; 412. First oil passage; 413. Second oil passage; 42. Push rod; 421. Snap-fit ​​groove; 5. Displacement sensor; 51. Magnet; 52. Waveguide wire; 6. Inlet check valve; 7. One-way valve for liquid discharge; 8. Dispensing plug; 81. Limiting part; 82. Extension part; 83. Buffer channel; 9. The second spring. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0025] In this document, when an element or layer is referred to as “located,” “joined to,” “connected to,” “attached to,” or “coupled to” another element or layer, it may be directly located, joined, connected, attached to, or coupled to the other element or layer, or there may be intermediate elements or layers present. Conversely, when an element is referred to as “directly on another element or layer,” “directly joined to,” “directly connected to,” “directly attached to,” or “directly coupled to” another element or layer, there may be no intermediate elements or layers present. Other terms used to describe relationships between elements should be interpreted in a similar manner (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items.

[0026] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0027] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0028] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0029] Research has revealed that heat exchangers are used in equipment such as refrigeration and air conditioning systems, and these heat exchangers require the addition of refrigerant. To improve the efficiency of refrigerant filling, current filling equipment adds a fixed volume of refrigerant in a single operation. However, the volume of refrigerant changes dramatically with even slight temperature variations. Due to the temperature rise of the refrigerant, traditional filling equipment cannot fill the required mass of refrigerant in a single operation.

[0030] Based on the above research, this disclosure provides a hydraulic device for refrigerant filling and its working method. The relative position between the piston rod and the hydraulic mechanism is adjusted by the filling amount adjustment mechanism, that is, the maximum volume of the liquid storage space is adjusted, so as to meet the requirement that the hydraulic device can fill a specified mass of refrigerant in a single operation under different temperature conditions.

[0031] The shortcomings of the above solutions are the result of the inventor's practical experience and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventor's contribution to this disclosure.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0034] like Figures 1 to 7As shown, at least one embodiment provides a hydraulic device for refrigerant filling, comprising: a controller, a liquid reservoir 1, a piston rod 2, a filling amount adjustment mechanism 3, a hydraulic mechanism 4, and a displacement sensor 5; wherein the liquid reservoir 1 is provided with a liquid storage chamber 11; the pushing part 21 of the piston rod 2 extends into the liquid storage chamber 11, so that the pushing part 21 divides the liquid storage chamber 11 into a liquid storage space 111 and a moving space 112; the connecting part 22 of the piston rod 2 is threadedly connected to the filling amount adjustment mechanism 3; the filling amount adjustment mechanism 3 is rotatably connected to the hydraulic mechanism 4, and the hydraulic mechanism 4 is connected to the liquid reservoir 1. The displacement sensor 5 is installed inside the hydraulic mechanism 4. Before the hydraulic mechanism 4 pushes the piston rod 2, the filling adjustment mechanism 3 is configured to rotate the piston rod 2 relative to the hydraulic mechanism 4 to adjust the maximum volume of the liquid storage space 111. The controller is configured to drive the hydraulic mechanism 4 to push the piston rod 2 to the farthest distance, and the controller is also configured to detect the moving distance of the piston rod 2 through the displacement sensor 5 to obtain the maximum volume of the liquid storage space 111, so that the filling adjustment mechanism 3 adjusts the maximum volume of the liquid storage space 111 to a set volume.

[0035] Specifically, please refer to Figure 2 The filling adjustment mechanism 3 rotates in the F2 direction, which in turn drives the piston rod 2 to move in the F1 direction, that is, adjusts the initial position of the liquid pushing part 21 in the liquid storage chamber 11, thereby adjusting the maximum volume of the liquid storage space 111.

[0036] Specifically, the piston rod 2 can also be guided and movably connected to the liquid storage box 1, meaning that there is a sliding groove and a slider cooperation relationship, so that the piston rod 2 can only move in the F1 direction, and at the same time the piston rod 2 cannot rotate in the F2 direction.

[0037] In at least one embodiment, the relative position between the piston rod 2 and the hydraulic mechanism 4 is adjusted by the filling amount adjustment mechanism 3, that is, the maximum volume of the liquid storage space 111 is adjusted to meet the requirement that the hydraulic device can fill a specified mass of refrigerant in a single operation under different temperature conditions.

[0038] In at least one embodiment, please refer to Figure 3 The filling amount adjustment mechanism 3 includes: an adjustment ring 31; the adjustment ring 31 is threadedly connected to the connecting part 22 of the piston rod 2, and the adjustment ring 31 is rotatably connected to the hydraulic mechanism 4; when the adjustment ring 31 rotates relative to the piston rod 2, the piston rod 2 moves relative to the adjustment ring 31, that is, the piston rod 2 moves relative to the hydraulic mechanism 4.

[0039] Specifically, since the adjusting ring 31 is rotatably connected to the hydraulic mechanism 4, and the adjusting ring 31 is threadedly connected to the connecting part 22 of the piston rod 2, when the adjusting ring 31 and the piston rod 2 rotate relative to each other, the piston rod 2 and the adjusting ring 31 move relative to each other, and the liquid pushing part 21 moves in the liquid storage chamber 11, thereby changing the maximum volume of the liquid storage space 111.

[0040] In at least one embodiment, please refer to Figure 3 The inner sidewall of the adjusting ring 31 is provided with a first threaded portion 311, and the connecting portion 22 of the piston rod 2 is provided with a second threaded portion 221. The first threaded portion 311 and the second threaded portion 221 are threadedly engaged, that is, the adjusting ring 31 and the connecting portion 22 of the piston rod 2 are threadedly connected.

[0041] Specifically, by engaging the first threaded portion 311 with the second threaded portion 221, when the adjusting ring 31 and the piston rod 2 rotate relative to each other, the piston rod 2 moves relative to the adjusting ring 31 in the direction of F1, thereby adjusting the position of the liquid pushing portion 21 in the liquid storage chamber 11, that is, adjusting the maximum volume of the liquid storage space 111.

[0042] In at least one embodiment, please refer to Figure 3 The filling adjustment mechanism 3 further includes: an annular sealing block 32 and several first springs 33; a sealing ring groove is provided on the piston rod 2, and the sealing ring groove is disposed facing the adjustment ring 31; the annular sealing block 32 is connected to the sealing ring groove through each of the first springs 33, and the annular sealing block 32 is disposed around the second threaded portion 221; the annular sealing block 32 extends into the sealing ring groove, and the annular sealing block 32 also elastically abuts against the adjustment ring 31 to prevent impurities from contacting the second threaded portion 221.

[0043] Specifically, when the adjusting ring 31 rotates, the annular sealing block 32 applies a force to the adjusting ring 31 under the elastic action of each first spring 33, which can prevent the adjusting ring 31 from rotating excessively in an instant, thereby improving the adjustment accuracy of the position of the liquid pushing part 21 in the liquid storage cavity 11, that is, improving the accuracy of adjusting the maximum volume of the liquid storage space 111.

[0044] Specifically, the annular sealing block 32 always abuts against the adjusting ring 31 under the elastic action of each first spring 33, which can hide the second threaded part 221 and prevent impurities from contacting the second threaded part 221.

[0045] In at least one embodiment, please refer to Figure 3 The hydraulic mechanism 4 has a locking groove 421 on the push rod 42 and a locking part 312 on the adjusting ring 31. The locking part 312 is rotatably connected to the locking groove 421, and the push rod 42 drives the piston rod 2 to move through the adjusting ring 31.

[0046] Specifically, by rotating the locking groove 421 and the locking part 312, the adjusting ring 31 can rotate relative to the push rod 42, and at the same time the push rod 42 can also drive the adjusting ring 31 to move in the F1 direction, thereby driving the piston rod 2 to move in the F1 direction.

[0047] In at least one embodiment, please refer to Figure 2 The hydraulic mechanism 4 includes a hydraulic housing 41 and a push rod 42. The hydraulic housing 41 is connected to the reservoir 1. A movable cavity 411 is provided inside the hydraulic housing 41. The movable part of the push rod 42 extends into the movable cavity 411, so that the movable part divides the movable cavity 411 into a first oil cavity 4111 and a second oil cavity 4112. A first oil passage 412 and a second oil passage 413 are provided on the hydraulic housing 41, which are respectively connected to the first oil cavity 4111 and the second oil cavity 4112. The push rod 42 is rotatably connected to the filling adjustment mechanism 3. The first oil passage 412 and the second oil passage 413 are respectively connected to the first oil cavity 4111 and the second oil cavity 4112 to push the movable part to move in the movable cavity 411, so that the push rod 42 drives the filling adjustment mechanism 3 to move, thereby pushing the liquid pushing part 21 to move in the reservoir 11.

[0048] Specifically, the first oil passage 412 and the second oil passage 413 are respectively connected to the corresponding oil pumps. By passing oil through the first oil chamber 4111 and the second oil chamber 4112, the push rod 42 can be pushed to move in the F1 direction.

[0049] In at least one embodiment, please refer to Figure 2 The magnet 51 of the displacement sensor 5 is located inside the push rod 42, and the waveguide wire 52 of the displacement sensor 5 extends into the push rod 42 and passes through the magnet 51; the controller is configured to acquire ultrasonic pulses from the magnet 51 on the waveguide wire 52 to acquire the moving distance of the push rod 42, that is, to acquire the moving distance of the piston rod 2.

[0050] Specifically, the displacement sensor 5 can accurately measure the moving distance of the push rod 42, thereby obtaining the moving distance of the piston rod 2, and finally obtaining the maximum volume of the liquid storage space 111, which is then converted into the mass of a single refrigerant filling.

[0051] In at least one embodiment, please refer to Figure 2 The liquid storage box 1 is provided with an inlet channel 12 and an outlet channel 13 that communicate with the liquid storage space 111. The inlet channel 12 and the outlet channel 13 are respectively connected to the inlet check valve 6 and the outlet check valve 7.

[0052] In at least one embodiment, please refer to Figure 4The hydraulic device for refrigerant filling further includes: a liquid outlet plug 8 and several second springs 9; a limiting cavity 14 is formed on the liquid storage box 1, the limiting cavity 14 is connected to the liquid outlet channel 13, the limiting part 81 of the liquid outlet plug 8 is located in the limiting cavity 14, the limiting part 81 is elastically connected to the limiting cavity 14 through each of the second springs 9, and the extension part 82 of the liquid outlet plug 8 extends into the liquid storage space 111 through the liquid outlet channel 13, the extension part 82 facing the liquid pushing part 2. 1. The liquid outlet plug 8 is provided with a buffer channel 83, and the buffer channel 83 passes through the limiting part 81 and the extension part 82. When the liquid pushing part 21 moves toward the extension part 82, the refrigerant in the liquid storage space 111 flows to the liquid outlet check valve 7 through the buffer channel 83 and the liquid outlet channel 13. After the liquid pushing part 21 contacts the extension part 82, it blocks the buffer channel 83, so that the refrigerant in the buffer channel 83 and the liquid outlet channel 13 is gradually pushed out from the liquid outlet check valve 7.

[0053] Specifically, when the liquid pusher 21 pushes the refrigerant out of the liquid outlet check valve 7, due to the inertia of the refrigerant flow, when the liquid pusher 21 moves to its farthest distance, the refrigerant in the liquid outlet channel 13 pushes open the liquid outlet check valve 7 due to inertia, causing the refrigerant in the liquid outlet channel 13 to flow out. That is, the single filling volume of the refrigerant is the maximum volume of the liquid storage space 111 plus the volume of the refrigerant in the liquid outlet channel 13, resulting in an inaccurate single filling volume of the refrigerant. Please refer to [link / reference needed]. Figure 5 By setting the liquid outlet plug 8 to buffer the liquid pushing part 21, the liquid pushing part 21 blocks the buffer channel 83 just as it contacts the extension part 82. At this time, a trace amount of refrigerant remains in the liquid storage space 111. Please refer to [link / reference]. Figure 6 The pusher 21 pushes the extension 82 to the farthest distance. Although some of the refrigerant in the buffer channel 83 and the outlet channel 13 will be pushed out, a small amount of refrigerant in the storage space 111 will enter the limiting cavity 14. At the same time, the limiting part 81 can isolate the refrigerant in the limiting cavity 14 from entering the outlet channel 13. This is equivalent to the remaining small amount of refrigerant in the storage space 111 replenishing the refrigerant that was pushed out of the outlet channel 13. That is, the single filling volume of the refrigerant is only the maximum volume of the storage space 111, which improves the accuracy of the single filling volume of the refrigerant.

[0054] Based on the same technical concept, at least one embodiment also provides a working method applicable to the hydraulic device as described above, which includes: before the hydraulic mechanism 4 pushes the piston rod 2, the filling amount adjustment mechanism 3 drives the piston rod 2 to move relative to the hydraulic mechanism 4 by rotation, so as to adjust the maximum volume of the liquid storage space 111; the controller drives the hydraulic mechanism 4 to push the piston rod 2 to the farthest distance, and the controller detects the moving distance of the piston rod 2 through the displacement sensor 5 to obtain the maximum volume of the liquid storage space 111, so that the filling amount adjustment mechanism 3 adjusts the maximum volume of the liquid storage space 111 to a set volume.

[0055] In summary, the present invention adjusts the relative position between the piston rod and the hydraulic mechanism through a filling adjustment mechanism, that is, adjusts the maximum volume of the liquid storage space, so as to meet the requirement that the hydraulic device can fill a specified mass of refrigerant in a single operation under different temperature conditions.

[0056] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0057] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as a second element, component, region, layer, or segment.

[0058] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0059] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.

[0060] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A hydraulic device for refrigerant filling, characterized in that, include: The system comprises a controller, a reservoir (1), a piston rod (2), a filling adjustment mechanism (3), a hydraulic mechanism (4), a displacement sensor (5), an outlet plug (8), and several second springs (9); among which... The liquid storage box (1) is provided with a liquid storage chamber (11); The piston rod (2) has a liquid-pushing part (21) that extends into the liquid storage chamber (11) so that the liquid-pushing part (21) divides the liquid storage chamber (11) into a liquid storage space (111) and an active space (112). The connecting part (22) of the piston rod (2) is threadedly connected to the filling amount adjustment mechanism (3); The filling adjustment mechanism (3) is rotatably connected to the hydraulic mechanism (4), the hydraulic mechanism (4) is connected to the liquid storage box (1), and the displacement sensor (5) is installed inside the hydraulic mechanism (4); Before the hydraulic mechanism (4) pushes the piston rod (2), the filling amount adjustment mechanism (3) is configured to move the piston rod (2) relative to the hydraulic mechanism (4) by rotating it to adjust the maximum volume of the liquid storage space (111); The controller is configured to drive the hydraulic mechanism (4) to push the piston rod (2) to move to the farthest distance, and the controller is also configured to detect the movement distance of the piston rod (2) by the displacement sensor (5) to obtain the maximum volume of the liquid storage space (111) so that the filling adjustment mechanism (3) adjusts the maximum volume of the liquid storage space (111) to a set volume; The liquid storage box (1) is provided with an inlet channel (12) and an outlet channel (13) that connect to the liquid storage space (111). The inlet channel (12) and the outlet channel (13) are respectively connected to the inlet check valve (6) and the outlet check valve (7). The liquid storage box (1) has a limiting cavity (14) which is connected to the liquid outlet channel (13). The limiting part (81) of the liquid outlet plug (8) is located in the limiting cavity (14). The limiting part (81) is elastically connected to the limiting cavity (14) through each second spring (9). The extension part (82) of the liquid outlet plug (8) extends into the liquid storage space (111) through the liquid outlet channel (13). The extension part (82) is set towards the liquid pusher (21). The liquid outlet plug (8) has a buffer channel (83) inside, and the buffer channel (83) passes through the limiting part (81) and the extension part (82). When the pusher (21) moves toward the extension (82), the refrigerant in the storage space (111) flows through the buffer channel (83) and the outlet channel (13) to the outlet check valve (7). After the pusher (21) contacts the extension (82), it blocks the buffer channel (83) to gradually push the refrigerant in the buffer channel (83) and the outlet channel (13) out of the outlet check valve (7). At this time, there is still a trace amount of refrigerant in the storage space (111). The pusher (21) pushes the extension (82) When the refrigerant in the buffer channel (83) and the liquid outlet channel (13) is pushed out to the farthest distance, a small amount of refrigerant in the liquid storage space (111) will enter the limiting cavity (14). At the same time, the limiting part (81) can isolate the refrigerant in the limiting cavity (14) from entering the liquid outlet channel (13). This is equivalent to the remaining small amount of refrigerant in the liquid storage space (111) replenishing the refrigerant pushed out of the original liquid outlet channel (13). That is, the volume of refrigerant filled at one time is only the maximum volume of the liquid storage space (111).

2. The hydraulic device for refrigerant filling as described in claim 1, characterized in that, The filling amount adjustment mechanism (3) includes: an adjustment ring (31); The adjusting ring (31) is threadedly connected to the connecting part (22) of the piston rod (2), and the adjusting ring (31) is rotatably connected to the hydraulic mechanism (4); When the adjusting ring (31) rotates relative to the piston rod (2), the piston rod (2) moves relative to the adjusting ring (31), that is, the piston rod (2) moves relative to the hydraulic mechanism (4).

3. The hydraulic device for refrigerant filling as described in claim 2, characterized in that, The inner wall of the adjusting ring (31) is provided with a first threaded part (311), and the connecting part (22) of the piston rod (2) is provided with a second threaded part (221). The first threaded part (311) and the second threaded part (221) are threadedly engaged, that is, the adjusting ring (31) and the connecting part (22) of the piston rod (2) are threadedly connected.

4. The hydraulic device for refrigerant filling as described in claim 3, characterized in that, The filling adjustment mechanism (3) further includes: an annular sealing block (32) and several first springs (33); A sealing ring groove is provided on the piston rod (2), and the sealing ring groove is set towards the adjusting ring (31); The annular sealing block (32) is connected to the sealing ring groove by each first spring (33), and the annular sealing block (32) is arranged around the second threaded portion (221); The annular sealing block (32) extends into the sealing ring groove, and the annular sealing block (32) also elastically abuts against the adjusting ring (31) to prevent impurities from contacting the second threaded portion (221).

5. The hydraulic device for refrigerant filling as described in claim 2, characterized in that, The push rod (42) of the hydraulic mechanism (4) has a snap-fit ​​groove (421), and the adjusting ring (31) has a snap-fit ​​part (312). The snap-fit ​​part (312) is rotatably connected to the snap-fit ​​groove (421), and the push rod (42) drives the piston rod (2) to move through the adjusting ring (31).

6. The hydraulic device for refrigerant filling as described in claim 1, characterized in that, The hydraulic mechanism (4) includes: a hydraulic housing (41) and a push rod (42). The hydraulic housing (41) is connected to the reservoir (1). The hydraulic housing (41) is provided with a movable cavity (411). The movable part of the push rod (42) extends into the movable cavity (411) so that the movable part divides the movable cavity (411) into a first oil cavity (4111) and a second oil cavity (4112). The hydraulic housing (41) is provided with a first oil passage (412) and a second oil passage (413) which are respectively connected to the first oil cavity (4111) and the second oil cavity (4112). The push rod (42) is rotatably connected to the filling amount adjustment mechanism (3); The first oil passage (412) and the second oil passage (413) are respectively connected to the first oil chamber (4111) and the second oil chamber (4112) to push the movable part to move in the movable chamber (411), so that the push rod (42) drives the filling amount adjustment mechanism (3) to move, thereby pushing the liquid pushing part (21) to move in the liquid storage chamber (11).

7. The hydraulic device for refrigerant filling as described in claim 6, characterized in that, The magnet (51) of the displacement sensor (5) is located inside the push rod (42), and the waveguide wire (52) of the displacement sensor (5) extends into the push rod (42) and passes through the magnet (51). The controller is configured to acquire ultrasonic pulses from the magnet (51) on the waveguide wire (52) to acquire the movement distance of the push rod (42), i.e., to acquire the movement distance of the piston rod (2).

8. A method of operating a hydraulic device as described in any one of claims 1-7, characterized in that, include: Before the hydraulic mechanism (4) pushes the piston rod (2), the filling amount adjustment mechanism (3) rotates to drive the piston rod (2) to move relative to the hydraulic mechanism (4) in order to adjust the maximum volume of the liquid storage space (111); The controller drives the hydraulic mechanism (4) to push the piston rod (2) to the farthest distance, and the controller detects the movement distance of the piston rod (2) through the displacement sensor (5) to obtain the maximum volume of the liquid storage space (111), so that the filling amount adjustment mechanism (3) adjusts the maximum volume of the liquid storage space (111) to the set volume.

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