A flow path switching device for a heat pump unit

Abstract

The present invention discloses a flow path switching device for a heat pump unit, which belongs to the technical field of heat pump equipment. Its structure includes a shell, a cover plate, a sealing ring, a flow path switching disk and a refrigerant pushing component; the cover plate and the sealing ring are respectively detachably fixedly mounted on the side and the inside of the shell, the flow path switching disk is rotatably mounted in the sealing ring, an arc-shaped channel is arranged in the flow path switching disk, and a refrigerant pushing component is slidably mounted on the arc-shaped channel; the present application can accurately switch different flow paths, and keep these flow paths in a state of isolation from each other during the switching process, thereby ensuring the operating stability of the heat pump system, and on this basis, push part of the gas refrigerant in the designated flow path, thereby reducing the total amount of refrigerant demanded by multiple flow paths, improving the recycling efficiency of the refrigerant, and reducing the overall cost of the equipment.

Description

Technical Field

[0001] The invention relates to the technical field of heat pump equipment, in particular to a flow path switching device for a heat pump unit. Background Art

[0002] Heat pump flow path switching is to change the flow path of the refrigerant in the heat pump system according to different working conditions and requirements; this switching can optimize the working efficiency of the heat pump and improve the adaptability and reliability of the system;

[0003] The existing application number is CN201811092479.0, and the heat pump unit and the flow path switching device thereof, which discloses a solution of integrating two switching components in the same module, and realizing flow path switching by controlling the rotation of each switching component or controlling the two switching components to rotate synchronously, while reducing the number of valves required to be used; specifically: the device includes a connecting seat; a first switching component installed on one side of the connecting seat, connected to the first flow path system, and used to switch the first flow path of the first flow path system; and a second switching component installed on the other side of the connecting seat, connected to the second flow path system, and used to switch the The second flow path of the second flow path system; the first flow path of the first flow path system is connected by the first switching component to realize the switching of the first flow path connection, and the second switching component is connected to the second flow path of the second flow path system to realize the switching of the second flow path connection; that is, the single switching of the first flow path system, the single switching of the second flow path system, and the simultaneous switching of the first flow path system and the second flow path system can be realized by a flow path switching device; the flow path switching device of the present invention effectively solves the problem of the increase in the number of valves caused by the current realization of cooling and heating functions by switching the water system, and reduces the number of valves;

[0004] However, when using the technical solution in the above-mentioned patent document, after the flow path is switched, it will cause accumulation of refrigerant in the unconducted pipes; when the number of flow paths used is large, this accumulation problem will increase the overall demand for refrigerant; since the refrigerant is only used in a single path, the overall economic cost of the equipment is increased, and the overall utilization efficiency of the system is reduced. Therefore, the present application provides a flow path switching device for a heat pump unit. Summary of the invention

[0005] In order to address the deficiencies in the above-mentioned prior art, the object of the present invention is to provide a flow path switching device for a heat pump unit, which is capable of accurately switching different flow paths and keeping these flow paths isolated from each other during the switching process, thereby ensuring the operating stability of the heat pump system. On this basis, part of the gas refrigerant in the designated flow path is pushed, thereby reducing the total demand for refrigerant in multiple flow paths, improving the recycling efficiency of the refrigerant, and reducing the overall cost of the equipment.

[0006] The technical solution adopted by the present invention to solve the technical problem is:

[0007] A flow switching device for a heat pump unit is provided, comprising a shell, a cover plate, a sealing ring, a flow switching disk and a refrigerant pushing component; the cover plate and the sealing ring are respectively detachably fixedly mounted on the side and the inside of the shell, the flow switching disk is rotatably mounted in the sealing ring, an arc-shaped channel is provided in the flow switching disk, and a refrigerant pushing component is slidably mounted in the arc-shaped channel.

[0008] Among them, a plurality of pipelines are fixed and connected to the side of the sealing ring, the pipelines penetrate the shell and extend toward the outside of the shell, the arc channel can be connected to one of the plurality of pipelines, and the refrigerant pushing component can enter one of the plurality of pipelines along the arc channel.

[0009] Furthermore, two conducting tubes are fixed and connected on the flow path switching disk, and a valve plate is slidably installed in the conducting tube. The two valve plates can divide the internal space of the arc channel into an idle space and two conducting channels. The idle space is located between the two conducting channels, and the idle space is used to place the refrigerant pushing component. The conducting channel and the cover plate are respectively connected with connecting pipe I and connecting pipe II. Connecting pipe I and connecting pipe II are connected by a hose. A valve is provided on connecting pipe II, and the other end of connecting pipe II is connected to the refrigerant flow pipeline in the heat pump unit.

[0010] Furthermore, the refrigerant pushing component includes a flexible sleeve, both ends of the flexible sleeve are respectively connected to flexible covers, the outer side surface of the flexible sleeve abuts against the inner side surfaces of the pipeline and the arc-shaped channel, a center seat is fixedly installed in the middle of the inner side of the flexible sleeve, and the two sides of the center seat are respectively connected to the flexible cover through a creeping drive assembly and a tightening end seat, and a telescopic arm is slidably installed on the side of the tightening end seat, and the positioning end head at the end of the telescopic arm can be tightened against the inner side surface of the flexible cover.

[0011] An optional technical solution for the crawling drive assembly used in the present application is: the crawling drive assembly is an electric cylinder, and the fixed end and the movable end of the electric cylinder are respectively rotatably connected to the center seat and the tightening end seat through a pin structure.

[0012] Another optional technical solution for the crawling drive assembly used in the present application is: hinged joints are respectively connected at both ends of the crawling drive assembly, and the two hinged joints are rotatably connected to the hinged seat I on the center seat and the hinged seat II on the tightening end seat respectively; an electric cylinder II is fixedly installed in the crawling drive assembly, and a piston is fixedly installed on the movable end of the electric cylinder II, the hinged joint on one side is fixedly connected to the piston, and the hinged joint on the other side is fixedly connected to the crawling drive assembly.

[0013] Wherein, a spherical protrusion is arranged at the end of the hinged head, and a spherical cavity is arranged inside the hinged seat I and the hinged seat II respectively, and the spherical cavity is rotatably connected with the spherical protrusion in an engaging manner.

[0014] Furthermore, two telescopic arms are provided, and the two telescopic arms are installed oppositely on both sides of the tightening end seat. A gear shaft and a second rotating driver for driving the gear shaft to rotate are installed on the tightening end seat. The gear shaft is also connected to the toothed structure on the sides of the two telescopic arms through meshing transmission.

[0015] Furthermore, a shaft cylinder is fixedly installed in the middle of the flow path switching disk, and both ends of the shaft cylinder pass through the shell and the cover plate respectively. Covers for shielding the ends of the shaft cylinder are removably fixedly installed on the outer sides of the shell and the cover plate respectively; a first rotation driver is installed on the inner side of the cover corresponding to the cover plate, and the output shaft of the first rotation driver is removably fixedly connected to the shaft cylinder through a flange structure.

[0016] Furthermore, annular bushings are respectively sleeved and installed on the outer sides of the two ends of the shaft cylinder, and the outer sides of the two annular bushings are respectively abutted against the shell and the cover plate. A limiting ring is fixedly installed on the outer side of the shaft cylinder, and the side of the limiting ring is abutted against the inner side of the cover plate and the end surface of the annular bushing connected to the cover plate.

[0017] Furthermore, a plurality of shrinkage grooves are arranged on the outer side of the flexible sleeve.

[0018] Furthermore, a plurality of inner support rings are fixedly mounted on the inner side of the flexible sleeve, and the elastic modulus of the inner support rings is greater than the elastic modulus of the flexible sleeve.

[0019] Furthermore, the opening positions of the two ends of the arc-shaped channel on the flow path switching disk are staggered along the axial direction of the flow path switching disk.

[0020] Furthermore, a sealing ring is fixedly mounted on the outer side surface of the flexible cover, and the outer side surface of the sealing ring abuts against the inner side surfaces of the pipeline and the arc-shaped channel.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. In the flow path switching device for a heat pump unit of the present invention, two valve plates are kept in an extended state in their respective corresponding conducting tubes, and the refrigerant pushing component is isolated and placed in the idle space in the middle of the arc-shaped channel; at this time, the pipeline is connected with the refrigerant flow pipeline in the heat pump unit through the conducting channel, connecting pipe I, hose and connecting pipe II to maintain the normal operation of the heat pump unit; when the external environment of different pipelines changes, by switching different pipelines to connect with the two conducting channels in the arc-shaped channel, the flow path of the refrigerant inside the system is changed, and the working efficiency of the heat pump is optimized.

[0023] 2. The heat pump unit of the present invention uses a flow path switching device to control the refrigerant pushing component to crawl in the pipeline and the arc channel, so that part of the gas refrigerant inside the corresponding pipeline flows toward the connecting pipe I and the connecting pipe II on the side away from the refrigerant pushing component, and finally pushes it into the refrigerant flow path inside the heat pump unit; then, the flow path switching disk is controlled to rotate to switch different pipelines and arc channels to be connected, and as the heat pump unit runs, part of the refrigerant gas pushed into the refrigerant flow path inside the heat pump unit returns to the new pipeline; by using the above operation, the total demand for refrigerant in multiple flow paths is reduced, the recycling efficiency of the refrigerant is improved, and the overall cost of the equipment is reduced.

[0024] 3. The flow path switching device for the heat pump unit in the example of the present invention utilizes a refrigerant pushing component to push the refrigerant in a designated pipeline, and only pushes part of the refrigerant inside the pipeline, not all of it; in addition, the idle space for placing the refrigerant pushing component also contains some gaseous refrigerant, so that the refrigerant pushing component will not cause equipment damage due to negative pressure inside the pipeline during its crawling process inside the pipeline.

[0025] 4. In the flow path switching device for a heat pump unit in the example of the present invention, the opening positions of the two ends of the arc-shaped channel on the flow path switching disk are staggered along the axial direction of the flow path switching disk, so that the number of pipelines that can be connected to the side of the sealing ring is increased, thereby improving the switching performance of the internal flow path of the heat pump unit; in addition, after the number of pipelines connected to the side of the sealing ring is increased, the multiple pipelines are still isolated from each other, and the stability of the equipment operation is good.

[0026] 5. In the flow path switching device for a heat pump unit of the example of the present invention, a plurality of inner support rings are fixedly installed on the inner side of the flexible sleeve, and the elastic modulus of the inner support rings and the flexible cover are both greater than the elastic modulus of the flexible sleeve; the inner support rings and the flexible cover are used to support the flexible sleeve from the inside and the end to ensure stable fitting between the flexible sleeve and the inner side of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0028] Figure 1 Structural decomposition of the flow path switching device provided in the embodiment of the present invention Figure 1 ;

[0029] Figure 2 A cross-sectional view of a flow path switching disk provided in an embodiment of the present invention;

[0030] Figure 3 Structural decomposition of the flow path switching device provided in the embodiment of the present invention Figure 2;

[0031] Figure 4 A schematic diagram of the structure of a housing and a flow path switching disk provided in an embodiment of the present invention;

[0032] Figure 5 A schematic diagram of the structure of the flow path and the sealing ring provided in an embodiment of the present invention;

[0033] Figure 6 A schematic diagram of the structure of a flow path switching disk, a shaft cylinder and an arc-shaped channel provided in an embodiment of the present invention;

[0034] Figure 7 A schematic diagram of the structure of the electric cylinder I, the valve plate and the flexible sleeve provided in an embodiment of the present invention;

[0035] Figure 8 A schematic diagram of the structure of the flexible sleeve, the center seat, the flexible cover and the tightening end seat provided in an embodiment of the present invention;

[0036] Fig. 9 A schematic diagram of the structure of a tightening end seat, a telescopic arm and a positioning end head provided in an embodiment of the present invention;

[0037] Fig.10 A cross-sectional view of a creep drive assembly provided in an embodiment of the present invention.

[0038] In the figure: 1 pipeline, 11 shell, 12 cover plate, 13 cover, 14 annular bushing, 15 sealing ring, 16 connecting pipe II, 17 valve, 21 flow path switching disk, 22 shaft cylinder, 23 limit ring, 24 first rotation driver, 25 arc channel, 26 connecting pipe I, 27 conducting cylinder, 28 electric cylinder I, 29 valve plate, 31 flexible sleeve, 311 contraction groove, 312 inner support ring, 32 center seat, 33 flexible cover, 331 sealing ring, 34 articulated seat I, 35 creeping drive assembly, 351 electric cylinder II, 352 piston, 353 hinge head, 36 top tightening end seat, 361 articulated seat II, 362 second rotation driver, 363 gear shaft, 37 telescopic arm, 38 positioning end head. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0040] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0041] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "first" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings.

[0045] Embodiment 1:

[0046] like Figure 1 , Figure 4 , Figure 5 , Figure 6 and Figure 8 As shown, this embodiment provides a flow switching device for a heat pump unit, including a shell 11, a cover plate 12, a sealing ring 15, a flow switching disk 21 and a refrigerant pushing component; the cover plate 12 and the sealing ring 15 are respectively detachably fixedly installed on the side and the inside of the shell 11, the flow switching disk 21 is rotatably installed in the sealing ring 15, and an arc channel 25 is provided in the flow switching disk 21, and a refrigerant pushing component is slidably installed in the arc channel 25.

[0047] Among them, a plurality of pipelines 1 are fixed and connected to the side of the sealing ring 15, and a gas refrigerant is stored inside the pipeline 1. The gas refrigerant can be selected from refrigerant products such as R410A, R407C or R417A that can be purchased on the market; the pipeline 1 passes through the shell 11 and extends toward the outside of the shell 11.

[0048] like Figure 4 and Figure 6 As shown, two conducting cylinders 27 are fixed and connected on the flow path switching disk 21, a valve plate 29 is slidably installed in the conducting cylinder 27, and an electric cylinder I 28 for driving the conducting cylinder 27 to move is installed on the flow path switching disk 21;

[0049] The two valve plates 29 can divide the inner space of the arc-shaped channel 25 into an idle space and two conducting channels. The idle space is located between the two conducting channels and is used to place the refrigerant pushing component. The conducting channels are connected with a connecting pipe I 26. Figure 4 As shown, the connecting pipe I 26 is closer to the opening position of the arc-shaped channel 25 relative to the valve plate 29 .

[0050] like Figure 1 As shown, the cover plate 12 is connected with a connecting pipe II 16, and the connecting pipe I 26 and the connecting pipe II 16 are connected through a hose. The hose uses a steel wire reinforced rubber hose or a steel wire braided rubber hose. A valve 17 is provided on the connecting pipe II 16, and the other end of the connecting pipe II 16 is connected to the refrigerant flow pipeline in the heat pump unit.

[0051] like Figure 8 As shown, the refrigerant pushing component includes a flexible sleeve 31, and both ends of the flexible sleeve 31 are respectively connected to flexible covers 33, the outer side surface of the flexible sleeve 31 abuts against the inner side surfaces of the pipeline 1 and the arc-shaped channel 25, and a center seat 32 is fixedly installed in the middle of the inner side of the flexible sleeve 31, and the two sides of the center seat 32 are respectively connected to the flexible cover 33 through a creeping drive assembly 35 and a tightening end seat 36, and a telescopic arm 37 is slidably installed on the side of the tightening end seat 36, and the positioning end 38 at the end of the telescopic arm 37 can be tightened against the inner side surface of the flexible cover 33.

[0052] like Figure 7 and Figure 8 As shown, a plurality of contraction grooves 311 are provided on the outer side of the flexible sleeve 31. The contraction grooves 311 are annular and are arranged at equal intervals on the outer side of the flexible sleeve 31. The contraction grooves 311 are used to keep the overall shape of the flexible sleeve 31 stable during the crawling of the refrigerant pushing component in the pipeline 1 and the arc channel 25.

[0053] like Fig. 9 As shown, two telescopic arms 37 are provided, and the two telescopic arms 37 are oppositely mounted on two sides of the tightening end seat 36. A gear shaft 363 and a second rotation driver 362 for driving the gear shaft 363 to rotate are mounted on the tightening end seat 36. The gear shaft 363 is connected to the toothed structure on the sides of the two telescopic arms 37 through meshing transmission. The second rotation driver 362 is started to control the rotation of the gear shaft 363, thereby driving the two telescopic arms 37 to move synchronously in opposite directions.

[0054] As shown in Figure 8, a sealing ring 331 is fixedly installed on the outer side of the flexible cover 33. The sealing ring 331 is also made of elastic material. The outer side of the sealing ring 331 abuts against the inner side of the pipeline 1 and the arc-shaped channel 25. When there is no pressure on the outside of the flexible sleeve 31 and the sealing ring 331, the sealing ring 331 protrudes outward from the outer side of the flexible sleeve 31 to prevent the refrigerant from leaking into the shrinkage groove 311.

[0055] In this embodiment, the creeping drive assembly 35 is an electric cylinder, and the fixed end and the movable end of the electric cylinder are rotatably connected to the center seat 32 and the tightening end seat 36 respectively through a pin structure. Starting the electric cylinder changes the distance between the center seat 32 and the tightening end seat 36.

[0056] In this embodiment, a handle (not shown in the figure) is fixedly installed at the center of the end of the flow path switching disk 21. The shell 11 and the rotating handle are respectively provided with scale lines for determining the rotation angle of the flow path switching disk 21. Holding the handle and rotating it, the flow path switching disk 21 is driven to rotate around its own axis, and the arc channel 25 is switched to be connected to different pipelines 1. In this state, the overall manufacturing and maintenance costs of the equipment are reduced.

[0057] When the heat pump unit is operating normally;

[0058] The two valve plates 29 remain extended in their respective corresponding conducting tubes 27, isolating the refrigerant pushing component and placing it in the idle space in the middle of the arc-shaped channel 25; at this time, the pipeline 1 is connected with the refrigerant flow pipeline in the heat pump unit through the conducting channel, connecting pipe I 26, hose and connecting pipe II 16, maintaining the normal operation of the heat pump unit.

[0059] When the external environment of different pipelines 1 changes, by switching different pipelines 1 to communicate with the two conducting channels in the arc-shaped channel 25, the flow path of the refrigerant inside the system is changed, thereby optimizing the working efficiency of the heat pump.

[0060] When the flow path switching device of the present application is used to switch the refrigerant flow path inside the heat pump unit;

[0061] Step 1: Start the electric cylinder I 28 to control the single valve plate 29 to move to the outside of the arc-shaped channel 25, and close the valve 17 on the connecting pipe II 16 connected to the connecting pipe I 26 adjacent to the valve plate 29, so that the refrigerant pushing component can enter the pipeline 1 connected to the arc-shaped channel 25 along the arc-shaped channel 25;

[0062] Step 2: Start the crawling drive assembly 35 in the flexible sleeve 31, change the distance between the central seat 32 and the two flexible covers 33, so that the two move in the direction away from or close to each other, and control the alternating extension and retraction of the telescopic arms 37 on the sides of the two pressing end seats 36 along with the operation of the second rotary drive 362, and press the flexible sleeve 31, so that the outer side surface of the flexible sleeve 31 is pressed against the inner side surface of the arc-shaped channel 25 or the inner side surface of the pipeline 1, thereby driving the refrigerant pushing component to crawl in the pipeline 1 and the arc-shaped channel 25, and causing part of the gas refrigerant inside the corresponding pipeline 1 to flow toward the connecting pipe I26 and the connecting pipe II16 on the side away from the refrigerant pushing component, and finally push it into the refrigerant flow path inside the heat pump unit;

[0063] Step 3: Close the valve 17 on the connecting pipe II 16, and according to the operation of step 2, move the refrigerant pushing component back to the idle space in the middle of the arc-shaped channel 25, and then keep the two valve plates 29 in the corresponding guide tubes 27 in the extended state;

[0064] Step 4: Control the flow path switching disk 21 to rotate, switch different pipelines 1 to be connected with the arc channel 25, and as the heat pump unit runs, part of the refrigerant gas pushed into the refrigerant flow path inside the heat pump unit returns to the new pipeline 1; by using the above operation, the total demand for refrigerant in multiple flow paths is reduced, the recycling efficiency of the refrigerant is improved, and the overall cost of the equipment is reduced.

[0065] In step 4, during the process of switching different pipelines 1 to be connected with the arc-shaped channel 25, the multiple pipelines 1 remain isolated from each other during the flow path switching process, and the use stability is good;

[0066] The present application uses a wireless charging module to power the electric cylinder and the rotating driver inside the flexible sleeve 31. Specifically: the wireless charging module includes a transmitting module and a receiving module. The transmitting module is installed in the flow path switching disk 21, and the receiving module and the battery are installed on the center seat 32 in the flexible sleeve 31.

[0067] It should be noted that the present application uses a refrigerant pushing component to push the refrigerant in the designated pipeline 1, and only pushes part of the refrigerant inside the pipeline 1, not all of it; in addition, the idle space used to place the refrigerant pushing component also contains some gaseous refrigerant, so that the refrigerant pushing component will not cause equipment damage due to negative pressure inside the pipeline during the crawling process inside the pipeline 1.

[0068] In order to increase the number of pipelines 1 that can be connected to the side of the sealing ring 15, as shown in FIG. Figure 6As shown, the opening positions of the two ends of the arc-shaped channel 25 on the flow path switching disk 21 are staggered along the axial direction of the flow path switching disk 21, so that the number of pipelines 1 that can be connected to the side of the sealing ring 15 is increased, and the switching performance of the internal flow path of the heat pump unit is improved; in addition, after the number of pipelines 1 connected to the side of the sealing ring 15 is increased, as shown in FIG. Figure 5 As shown, the multiple pipelines 1 remain isolated from each other, and the equipment has good operation stability.

[0069] In order to increase the pushing effect of the refrigerant pushing component on the refrigerant in the pipeline 1, as Figure 8 As shown, a plurality of inner support rings 312 are fixedly installed on the inner side of the flexible sleeve 31, and the elastic modulus of the inner support rings 312 and the flexible cover 33 are both greater than the elastic modulus of the flexible sleeve 31; the inner support rings 312 and the flexible cover 33 are used to support the flexible sleeve 31 from the inside and the end to ensure stable fit between the flexible sleeve 31 and the inner side of the pipeline 1.

[0070] Embodiment 2:

[0071] The features of this embodiment that are the same as those of the first embodiment are not described in detail. The difference between this embodiment and the first embodiment is that: Figure 8 , Fig. 9 and Fig.10 As shown, in this embodiment, both ends of the crawling drive assembly 35 are respectively connected with hinged joints 353, and the two hinged joints 353 are rotatably connected with the hinged seat Ⅰ34 on the center seat 32 and the hinged seat Ⅱ361 on the tightening end seat 36 respectively; an electric cylinder Ⅱ351 is fixedly installed in the crawling drive assembly 35, and a piston 352 is fixedly installed on the movable end of the electric cylinder Ⅱ351, the hinged joint 353 on one side is fixedly connected with the piston 352, and the hinged joint 353 on the other side is fixedly connected with the crawling drive assembly 35.

[0072] Among them, a spherical protrusion is arranged at the end of the hinge head 353, and a spherical cavity is arranged inside the hinge seat I34 and the hinge seat II361 respectively, and the spherical cavity is engaged and rotatably connected with the spherical protrusion.

[0073] Start the electric cylinder II 351 to control the two hinged joints 353 to move away from or towards each other, and along with the operation of the second rotary driver 362, control the alternating extension and retraction of the telescopic arms 37 on the sides of the two tightening end seats 36 to press the flexible sleeve 31, so that the outer side surface of the flexible sleeve 31 is pressed against the inner side surface of the arc-shaped channel 25 or the inner side surface of the pipeline 1, thereby driving the refrigerant pushing component to crawl in the pipeline 1 and the arc-shaped channel 25.

[0074] During this process, the two hinged joints 353 rotate in the hinged seat I 34 and the hinged seat II 361 respectively. Since the ends of the hinged joints 353 are provided with spherical protrusions, the torsional freedom of the flexible covers 33 at both ends of the flexible sleeve 31 is increased, and the crawling is smooth and the effect is good.

[0075] In this embodiment, by setting the electric cylinder II 351 in the creeping drive assembly 35 and using the outer side surface of the piston 352 to fit tightly against the inner side surface of the creeping drive assembly 35, compared with the solution in Example 1, it is possible to avoid bending and pulling of the electric cylinder II 351 due to the different directions of the reaction forces borne by the two hinged joints 353 during the operation of the electric cylinder II 351, thereby ensuring the operating stability of the equipment.

[0076] Embodiment three:

[0077] The features of this embodiment that are the same as those of the first embodiment are not described in detail. The difference between this embodiment and the first embodiment is that: Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6 As shown, in this embodiment, a shaft cylinder 22 is fixedly installed in the middle of the flow path switching disk 21, and two ends of the shaft cylinder 22 respectively penetrate the shell 11 and the cover plate 12, and covers 13 for shielding the ends of the shaft cylinder 22 are detachably fixedly installed on the outer sides of the shell 11 and the cover plate 12; a first rotation driver 24 is installed on the inner side of the cover 13 corresponding to the cover plate 12, and the output shaft of the first rotation driver 24 is detachably fixedly connected to the shaft cylinder 22 through a flange structure.

[0078] Start the first rotation driver 24 to drive the shaft cylinder 22 and the flow switching disk 21 to rotate relative to the cover plate 12, and switch the arc channel 25 to be connected to different pipelines 1. The above scheme in this embodiment and the rotation control method of the flow switching disk 21 in Example 1 have high automation control efficiency and can realize remote rotation drive control. In addition, since the first rotation driver 24 is inserted into the interior of the shaft cylinder 22, the efficient use of the internal space of the equipment is ensured, and the integrity and compactness of the equipment are improved without affecting the transportation and use of the equipment.

[0079] In order to increase the smoothness of the rotation of the shaft cylinder 22, as Figure 1 , Figure 2 and Figure 3As shown, annular bushings 14 are respectively sleeved and installed on the outer sides of the two ends of the shaft cylinder 22, so that the outer side surfaces of the two annular bushings 14 are respectively abutted against the shell body 11 and the cover plate 12, and a limiting ring 23 is fixedly installed on the outer side of the shaft cylinder 22, so that the side of the limiting ring 23 is abutted against the inner side surface of the cover plate 12 and the end surface of the annular bushing 14 connected to the cover plate 12; under the action of the annular bushing 14, the outer side surface of the shaft cylinder 22 is prevented from directly contacting the shell body 11 and the cover plate 12, thereby reducing the resistance during the rotation of the shaft cylinder 22, improving the mechanical efficiency, helping to protect the shaft cylinder surface from wear, and extending the service life of the equipment.

[0080] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

[0081] Except for the technical features described in the specification, the remaining technical features are known technologies to those skilled in the art. In order to highlight the innovative features of the present invention, the remaining technical features will not be described here in detail.

Claims

1. A flow path switching device for a heat pump unit, comprising a housing (11) and a cover plate (12) detachably fixedly mounted on a side of the housing (11), characterized in that: Also includes: A sealing ring (15) is fixedly mounted in the housing (11); a plurality of pipelines (1) are fixedly arranged on the side of the sealing ring (15) and are in communication with each other; the pipelines (1) penetrate the housing (11) and extend toward the outside of the housing (11); A flow path switching disk (21) is rotatably mounted in the sealing ring (15); the outer side surface of the flow path switching disk (21) is in contact with the inner side surface of the sealing ring (15); an arc-shaped channel (25) is provided in the flow path switching disk (21); and the arc-shaped channel (25) can be connected to one of the plurality of pipelines (1); A refrigerant pushing component is slidably connected and installed in the arc-shaped channel (25); the refrigerant pushing component comprises a flexible sleeve (31), both ends of the flexible sleeve (31) are respectively connected to flexible covers (33), the outer side surface of the flexible sleeve (31) is in contact with the inner side surfaces of the pipeline (1) and the arc-shaped channel (25), a center seat (32) is fixedly installed in the middle of the inner side of the flexible sleeve (31), the two sides of the center seat (32) are respectively connected to the flexible cover (33) through a creeping drive assembly (35) and a tightening end seat (36), a telescopic arm (37) is slidably installed on the side of the tightening end seat (36), and a positioning end head (38) at the end of the telescopic arm (37) can be tightened against the inner side surface of the flexible cover (33); Two conducting cylinders (27) arranged on the flow path switching disk (21) are fixed and connected; a valve plate (29) is slidably mounted in the conducting cylinder (27); the two valve plates (29) can separate the internal space of the arc-shaped channel (25) into an idle space and two conducting channels; the idle space is located between the two conducting channels, and the idle space is used to place a refrigerant pushing component; A connecting pipe I (26) and a connecting pipe II (16) are respectively connected to the conducting channel and the cover plate (12); the connecting pipe I (26) and the connecting pipe II (16) are connected via a hose; a valve (17) is provided on the connecting pipe II (16); the other end of the connecting pipe II (16) is connected to a refrigerant circulation pipeline in the heat pump unit.

2. The flow path switching device for a heat pump unit according to claim 1, characterized in that: Both ends of the creeping drive assembly (35) are respectively connected to hinged joints (353), and the two hinged joints (353) are rotatably connected to a hinged seat I (34) on the center seat (32) and a hinged seat II (361) on the top tightening end seat (36). An electric cylinder II (351) is fixedly installed in the creeping drive assembly (35), a piston (352) is fixedly installed on the movable end of the electric cylinder II (351), a hinged joint (353) on one side is fixedly connected to the piston (352), and a hinged joint (353) on the other side is fixedly connected to the creeping drive assembly (35).

3. The flow path switching device for a heat pump unit according to claim 1, characterized in that: Two telescopic arms (37) are provided, and the two telescopic arms (37) are mounted oppositely on two sides of a tightening end seat (36). A gear shaft (363) and a second rotation driver (362) for driving the gear shaft (363) to rotate are mounted on the tightening end seat (36). The gear shaft (363) is connected to the toothed structure on the sides of the two telescopic arms (37) through meshing transmission.

4. The flow path switching device for a heat pump unit according to claim 1, characterized in that: A shaft cylinder (22) is fixedly mounted in the middle of the flow path switching disk (21), and two ends of the shaft cylinder (22) respectively penetrate the housing (11) and the cover plate (12), and covers (13) for shielding the ends of the shaft cylinder (22) are detachably fixedly mounted on the outer sides of the housing (11) and the cover plate (12); A first rotation driver (24) is installed on the inner side of the cover (13) corresponding to the cover plate (12), and an output shaft of the first rotation driver (24) is detachably fixedly connected to the shaft cylinder (22) via a flange structure.

5. The flow path switching device for a heat pump unit according to claim 4, characterized in that: Annular bushings (14) are respectively sleeved and installed on the outer sides of the two ends of the shaft cylinder (22), and the outer side surfaces of the two annular bushings (14) are respectively abutted against the housing (11) and the cover plate (12). A limiting ring (23) is fixedly installed on the outer side of the shaft cylinder (22), and the side of the limiting ring (23) is abutted against the inner side surface of the cover plate (12) and the end surface of the annular bushing (14) connected to the cover plate (12).

6. The flow path switching device for a heat pump unit according to claim 1, characterized in that: A plurality of contraction grooves (311) are provided on the outer side of the flexible sleeve (31).

7. The flow path switching device for a heat pump unit according to claim 1, characterized in that: A plurality of inner support rings (312) are fixedly mounted on the inner side of the flexible sleeve (31), and the elastic modulus of the inner support rings (312) is greater than the elastic modulus of the flexible sleeve (31).

8. The flow path switching device for a heat pump unit according to claim 1, characterized in that: The opening positions of the two ends of the arc-shaped channel (25) on the flow path switching disk (21) are staggered along the axial direction of the flow path switching disk (21).

9. The flow path switching device for a heat pump unit according to claim 2, characterized in that: A spherical protrusion is provided at the end of the hinged head (353), and a spherical cavity is provided inside the hinged seat I (34) and the hinged seat II (361), respectively, and the spherical cavity is engaged and rotatably connected with the spherical protrusion.

10. The flow path switching device for a heat pump unit according to claim 1, characterized in that: A sealing ring (331) is fixedly mounted on the outer side surface of the flexible cover (33), and the outer side surface of the sealing ring (331) abuts against the inner side surfaces of the pipeline (1) and the arc-shaped channel (25).

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