Pipe fitting tightening tool and refrigerant pipeline tightening connecting device
By designing a fixed mold and a movable mold for the pipe tightening tool, a fast and safe connection of air conditioning refrigerant pipes is achieved, solving the problems of cumbersome connection process and safety hazards in the existing process, and improving the reliability and aesthetics of the connection.
Patent Information
- Application Number
- CN202423266851.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2034-12-27
AI Technical Summary
The existing air conditioning refrigerant pipe connection process is cumbersome and poses safety hazards, especially the risk of open flame when welding is used in special construction environments.
A pipe tightening tool is used, and a fixed mold and a movable mold are used to drive the extrusion connection between the pipe and the pipe joint through a hydraulic cylinder. Combined with front and rear positioning steps, automatic centering is performed to ensure uniformity and safety of the connection.
It enables a quick and safe connection between pipes and pipe fittings, avoids safety hazards during the welding process, and improves the reliability and aesthetics of the connection.
Smart Images
Figure CN223699835U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of pipe fitting assembly tools, and particularly relates to a pipe fitting tightening tool and a refrigerant pipeline tightening and connecting device. BACKGROUND
[0002] Whether it is a central air conditioner or a separate air conditioner, energy is transported to carry out refrigeration or heating by using the change of the refrigerant gas-liquid state, and therefore the refrigerant pipe, which is a transmission pipeline, is indispensable. The existing air conditioner refrigerant pipeline is usually made into a certain length due to the limitation of the installation scene, and then is cut or connected according to the actual installation needs, especially when the pipeline is connected, the existing connection mode is mainly welding, and when welding, the port of one of the refrigerant pipes is usually first expanded, and then the other refrigerant pipe is inserted into the expanded port, and welding is carried out at the connection, so the whole process is complicated, and in some special construction environment, the use of the welding gun with open flame will have certain safety hazards. SUMMARY
[0003] To solve the above problems, the utility model provides a pipe fitting tightening tool and a refrigerant pipeline tightening and connecting device, which can conveniently and quickly tighten and connect the pipeline.
[0004] The utility model adopts the following technical scheme:
[0005] A pipe fitting tightening tool has the following characteristics: a tool main body, a working component, a connecting seat connected to the tool main body, a hydraulic cylinder installed on the connecting seat and having a piston rod and a piston spring movably arranged inside in the axial direction, a fixed die fixedly arranged at the front end of the hydraulic cylinder and having a fixed jaw, a movable die movably arranged outside the hydraulic cylinder and having a movable jaw, and a connecting piece connecting the movable die and the piston rod; wherein the fixed die is provided with a front positioning step on the side facing the movable die, and the movable die is provided with a rear positioning step on the side facing the fixed die.
[0006] In the pipe fitting tightening tool provided by the utility model, the fixed jaw has a front end face arranged on the side away from the movable die, the axis of the piston rod is perpendicular to the plane where the front end face is located, a rear end face arranged on the side close to the movable die, and the axis of the piston rod forms an angle α with the plane where the rear end face is located, wherein 85°≤α<90°.
[0007] In the pipe fitting tightening tool provided by the utility model, the tool main body has an outer shell, the oil pump, the motor seat and the driving motor are arranged in the outer shell in a straight line direction, one end of the motor seat is fixed with the driving motor, the other end is fixed with the oil pump, and a heat dissipation gasket is arranged between the motor seat and the driving motor.
[0008] The pipe tightening tool has the features that the working component further has a connecting seat for connecting the hydraulic cylinder and the oil pump, the connecting seat is internally provided with an oil passage, and the oil pump has: a pump body, an oil storage component further provided between the outer periphery of the pump body and the inner wall of the shell, and an oil inlet, an oil inlet cavity, an oil outlet, an oil outlet cavity, an oil return passage and an oil return cavity, an oil inlet valve installed in the oil inlet and used for connecting the oil storage component and the oil inlet cavity, an oil outlet valve installed in the oil outlet and used for connecting the oil inlet cavity and the oil outlet cavity, an oil outlet connector having one end installed in the oil outlet cavity and the other end extending out of the shell and rotatably connected with the connecting seat, and a pressure relief valve installed in the oil return cavity and used for connecting the oil return passage and the oil storage component.
[0009] The pipe tightening tool has the features that the outer end of the oil inlet is provided with a filter screen, and the pump body is provided with a fixing member on both sides of the filter screen, and the fixing member at least partially covers part of the edge of the filter screen.
[0010] The pipe tightening tool has the features that the pump body is further provided with a plunger assembly at the oil inlet cavity, and the plunger assembly has: a plunger sleeve threadedly fixed in the pump body, a plunger rod installed in the plunger sleeve, one end of the plunger rod penetrating into the oil inlet cavity through the plunger sleeve, the other end of the plunger rod extending out of the pump body, and a plunger sealing gasket sleeved on the outer periphery of the one end of the plunger rod extending out of the plunger sleeve; under the action of the driving motor, the plunger rod moves along the axis direction of the oil inlet cavity.
[0011] The pipe tightening tool has the features that the motor seat is provided with a driving assembly, and the driving assembly has: a roller installed on the output shaft of the driving motor through a retainer and rotating under the driving of the output shaft, a pushing wheel having an acting portion matched with the roller and moving along the axis direction under the driving of the roller, and a return spring compressed between the pushing wheel and the pump body; wherein the end surface of the pushing wheel is in abutment with the one end of the plunger rod extending out of the pump body, and when the pushing wheel moves towards the pump body under the action of the roller, the pushing wheel moves towards the oil inlet cavity.
[0012] The pipe tightening tool has the features that the side of the pushing wheel away from the pump body has a containing cavity, the roller is located in the containing cavity, and the inner wall of the containing cavity has a slope matched with the outer edge of the roller.
[0013] The utility model discloses a pipe tightening tool, which comprises a hydraulic cylinder, a fixed mold, a movable mold and a tool body.
[0014] The utility model discloses still propose a kind of refrigerant pipeline tightening connecting device, with such characteristics, comprising: joint assembly, with the pipe joint for connecting refrigerant pipe, pipe tightening tool, for the pipe joint and refrigerant pipe are tightened together;Wherein, tightening tool is the pipe tightening tool as described above, pipe joint has the convex ring that projects outward on it, and convex ring is abutted on front positioning step or rear positioning step.
[0015] In the refrigerant pipeline tightening connecting device provided by the utility model, the joint assembly further has an inner liner and a sliding sleeve, the inner liner is inserted into the end of the refrigerant pipe, and the sliding sleeve is sleeved on the outer periphery of the pipe joint.
[0016] Effects of the utility model
[0017] According to the pipe tightening tool and the refrigerant pipeline tightening connecting device, the fixed mold and the movable mold are arranged on the working component, the movable mold can move along with the piston rod arranged in the hydraulic cylinder, the pipe joint is placed on the fixed jaw of the fixed mold, and then the pipeline is placed on the movable jaw of the movable mold. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1Is the structure diagram of the pipe fitting tightening tool.
[0019] Figure 2 Is one of the sectional view of the working component.
[0020] Figure 3 Is the second sectional view of the working component.
[0021] Figure 4 Is the structure schematic view of the hydraulic cylinder.
[0022] Figure 5 Is the sectional view of the tool body.
[0023] Figure 6 Is the sectional view of the oil pump at the oil outlet valve.
[0024] Figure 7 Is the sectional view of the oil pump at the oil inlet valve.
[0025] Figure 8 Is the connection structure schematic view of the driving motor, motor base and oil pump.
[0026] Figure 9 Is the connection structure schematic view of the driving motor and driving assembly.
[0027] Figure 10 Is the partial sectional view of the working component of the embodiment 2.
[0028] Figure 11 Is the structure view of the refrigerant pipeline tightening and connecting device of the embodiment 3.
[0029] Figure 12 Is the structure exploded view of the refrigerant pipeline assembly of the embodiment 3.
[0030] Figure 13 Is the sectional view of the working component and the refrigerant pipeline assembly cooperation structure of the embodiment 3.
[0031] : pipe tightening tool 100, tool body 10, shell 11, oil pump 12, pump body 121, oil inlet 122, oil inlet cavity 123, oil outlet 124, oil outlet cavity 125, oil return channel 126, oil return cavity 127, oil return port 128, motor base 13, driving motor 14, output shaft 141, circuit board 15, battery 16, switch button 17, oil bag 18, heat dissipation gasket 19, working component 20, hydraulic cylinder 21, piston cavity 211, long hole 212, round hole 213, fixed die 22, fixed jaw 221, first fixed jaw 221a, second fixed jaw 221b, front end face 2211, rear end face 2212, front positioning step 222, fixed connecting piece 223, movable die 23, movable jaw 231, first movable jaw 231a, second movable jaw 231b, rear positioning step 232, connecting piece 24, connecting rod 241, piston rod 25, piston spring 26, connecting seat 27, locking nut 271, oil passage 272, spring seat 28, bushing 29, oil inlet valve 30, oil inlet valve seat 31, oil inlet valve core 32, oil inlet valve body 33, oil inlet valve spring 34, filter screen 35, fixing piece 36, oil outlet valve 40, oil outlet valve seat 41, oil outlet valve core 42, oil outlet valve body 43, oil outlet valve spring 44, oil outlet connector 45, pressure relief valve 50, pressure relief valve seat 51, oil return hole 511, pressure relief valve needle 52, pressure relief piston 53, pressure relief spring 54, pressure regulating spring seat 55, handle 56, pressure relief button 57, plunger assembly 60, plunger sleeve 61, plunger rod 62, plunger sealing gasket 63, plunger spring 64, driving assembly 70, roller 71, retainer 72, push wheel 73, inclined action surface 731, action end surface 732, return spring 74, connector assembly 80, refrigerant pipe 81, pipe connector 82, convex ring 821, annular groove 822, sliding sleeve 83, inner liner 84. DETAILED DESCRIPTION
[0032] In order to make the technical means, creative features, purposes and effects of the utility model easy to understand, the following will make a specific description of the electric tool body and electric tool of the utility model in combination with embodiments and drawings.
[0033] <Embodiment 1>
[0034] The embodiment provides a pipe tightening tool 100, which comprises a tool body 10 and a working part 20, the working part 20 is installed on the tool body 10 and works under the driving of the tool body 10. The tool body 10 is internally provided with an oil pump 12, the working part 20 is provided with a hydraulic cylinder 21, a fixed die 22, a movable die 23, a connecting piece 24 and a connecting seat 27, the hydraulic cylinder 21 is in a hollow cylindrical shape, is internally provided with a piston cavity 211 for entering oil, and is internally provided with a piston rod 25, a piston spring 26 and a spring seat 28 along the axial direction, a sealing ring is arranged between the outer periphery of one end of the piston rod 25 and the inner wall of the piston cavity 211, the spring seat 28 is arranged in the hydraulic cylinder 21 through a snap spring and is located at the front end of the piston rod 25, and the piston spring 26 is arranged between the piston rod 25 and the spring seat 28.
[0035] As shown in the figure, Figures 2-4 The fixed die 22 is fixedly sleeved at the front end of the outer periphery of the hydraulic cylinder 21, the hydraulic cylinder 21 is provided with a pair of symmetrical circular holes 213 close to the front end, the fixed die 22 is also provided with a pair of hole positions corresponding to the pair of circular holes, and the fixed die 22 is fixed on the hydraulic cylinder 21 by penetrating the circular holes 213 and the hole positions on the fixed die 22 through a fixed connecting piece 223, wherein the fixed connecting piece 223 and the connecting piece 24 can adopt the same structure. The movable die 23 is movably sleeved outside the hydraulic cylinder 21, the hydraulic cylinder 21 is provided with a pair of symmetrical long holes 212 at the rear of the circular holes 213 in the middle part, the connecting piece 24 is provided with a connecting rod 241, and the movable die 23 and the piston rod 25 are both provided with holes for the connecting rod 241 to penetrate, the connecting rod 241 is sequentially inserted into and penetrates the hole on the movable die 23, the long hole 212 on the hydraulic cylinder 21 and the hole on the piston rod 25 in the radial direction, and is then fixed through a fixed pin 242, so that the movable die 23 and the piston rod 25 are fixedly connected, and the long hole 212 is arranged to enable the movable die 23 to move along with the piston rod 25 when the piston rod 25 moves. In order to reduce the friction between the movable die 23 and the hydraulic cylinder 21 during movement and improve work efficiency, a bushing 29 can be arranged between the inner wall of the movable die 23 and the outer wall of the hydraulic cylinder 21 at both ends.
[0036] One end of the connecting seat 27 is formed with a socket for inserting the end part of the hydraulic cylinder 21, the outer periphery of the part of the hydraulic cylinder 21 inserted into the socket is provided with a locking nut 271, the hydraulic cylinder 21 and the connecting seat 27 are fastened together through the locking nut 271, and a sealing ring is arranged between the outer periphery of the hydraulic cylinder 21 and the inner wall of the socket. The connecting seat 27 is internally provided with an oil passage 272 leading to the socket, oil from the oil pump 12 can enter the socket and the piston cavity 211 through the oil passage 272, and the oil pushes the piston rod 25 to move the movable die 23 towards the direction of the fixed die 22.
[0037] The fixed die 22 has a fixed jaw 221 for placing the pipe assembly, and the movable die 23 has a movable jaw 231 for placing the pipe assembly, the fixed jaw 221 and the movable jaw 231 are coaxially arranged and in the shape of a C with one end open, the fixed die 22 is provided with a front positioning step 222 on the side of the fixed jaw 221 facing the movable die 23, and the movable die 23 is provided with a rear positioning step 232 on the side of the movable jaw 231 facing the fixed die 22, when the pipe assembly is placed on the fixed die 22 and the movable die 23, the convex ring on the pipe assembly can be just abutted on the front positioning step 222, so that the pipe can be automatically centered when the connection is tightened, and better positioning and guiding effects are achieved, and the pipe is uniformly stressed after the connection is tightened, and the connected pipe is more uniform and beautiful.
[0038] The fixed jaw 221 has a front end face 2211 arranged away from the movable die and a rear end face 2212 arranged close to the movable die, the axis of the piston rod 25 is arranged vertically to the plane where the front end face 2211 is located, and the axis of the piston rod 25 and the plane where the rear end face 2212 is located form an angle α, wherein 85°≤α<90°, and α is preferably 87°-89°, such an arrangement makes the fixed jaw 221 have a slightly outwardly expanded deformation shape, which can enhance the reliability of the connection. The rear end face 2212 is a half annular face, and the aforementioned angle α is the angle between the straight line where any radial line on the half annular face is located and the axis of the piston rod 25 (as shown in Figure 3 ).
[0039] As shown in Figure 1 and Figure 5 , the tool body 10 has an outer shell 11, the outer shell 11 is arranged with an oil pump 12, a motor base 13, a driving motor 14 and a circuit board 15 in sequence in a straight line direction, the outer shell 11 is formed by two half shells fixed to each other to form a space for mounting the oil pump 12, the motor base 13, the driving motor 14 and the circuit board 15, and the outer shell 11 is detachably provided with a battery 16 at the bottom, and the outer shell is provided with a switch button 17, and the switch button 17, the battery 16, the circuit board 15 and the driving motor 14 are electrically connected through wires.
[0040] As shown in Figure 5 and Figure 6 , the oil pump 12 has a pump body 121, and an oil storage component is fixed to the outer periphery of the pump body 121, in this embodiment, the oil storage component is an oil bag 18. The pump body 121 is provided with an oil inlet 122, an oil inlet cavity 123, an oil outlet 124, an oil outlet cavity 125, an oil return channel 126, an oil return cavity 127 and an oil return port 128, and the pump body 121 is installed with an oil inlet valve 30, an oil outlet valve 40, an oil outlet connector 45 and a pressure relief valve 50. Specifically, as shown in Figure 6 and Figure 7As shown, the oil inlet valve 30 is installed in the oil inlet 122 for connecting the oil bag 18 and the oil inlet cavity 123. The oil inlet valve 30 is a one-way valve, which has an oil inlet valve seat 31, an oil inlet valve core 32, an oil inlet valve body 33 and an oil inlet valve spring 34. The oil inlet valve seat 31 is screwed in the oil inlet 122. The oil inlet valve body 33 abuts against the oil inlet valve seat 31 at one end and is embedded in the oil inlet 122 at the other end, and a sealing ring is arranged on the inner wall of the oil inlet 122. The oil inlet valve spring 34 is arranged between the oil inlet valve core 32 and the oil inlet valve body 33. The oil inlet valve core 32 is plugged at one end of the oil outlet end of the oil inlet valve seat 31 and is movably arranged in the oil inlet valve body 33 by the oil inlet valve spring 34 at the other end. The oil inlet valve body 33 is provided with a plurality of oil holes for allowing oil to pass through. Figure 7 As shown, the oil inlet 122 is provided with a filter screen 35 outside the oil inlet valve seat 31. The filter screen 35 is provided with a fixing member 36 on both sides, which at least partially covers the edge of the filter screen 35. Figure 8 As shown, the fixing member 36 is a screw, which is screwed into the pump body 121. The position of the screw cap covers the edge of the filter screen 35, thereby firmly installing the filter screen 35 at the oil inlet 122. When the oil in the oil bag 18 is filled, the oil passes through the filter screen 35 and enters the oil inlet 122, and then pushes the oil inlet valve core 32 to move towards the oil inlet valve body 33. After the oil inlet valve core 32 is separated from the oil inlet valve seat 31, the oil can enter the oil inlet cavity 123 through the oil outlet end of the oil inlet valve seat 31 and the oil holes in the oil inlet valve body 33.
[0041] The oil outlet valve 40 is installed in the oil outlet 124 for connecting the oil inlet chamber 123 and the oil outlet chamber 125. The oil outlet valve 40 is a one-way valve similar to the oil inlet valve 30, which has an oil outlet valve seat 41, an oil outlet valve core 42, an oil outlet valve body 43 and an oil outlet valve spring 44. The oil outlet valve body 43 is screwed into the oil outlet 124. One end of the oil outlet valve seat 41 abuts against the oil outlet valve body 43, and the other end is embedded in the oil outlet 124 and has a sealing ring on the inner wall of the oil outlet 124. The oil outlet valve spring 44 is pressed between the oil outlet valve core 42 and the oil outlet valve body 43. One end of the oil outlet valve core 42 is plugged into the oil outlet of the oil outlet valve seat 41, and the other end is movably arranged in the oil outlet valve body 43 by the oil outlet valve spring 44. The oil outlet valve body 43 has a plurality of oil holes for oil to pass through. During oil inlet, the oil in the oil inlet chamber 123 pushes the oil outlet valve core 42 to move towards the side where the oil outlet valve body 43 is located, and after the oil outlet valve core 42 separates from the oil outlet valve seat 41, the oil can enter the oil outlet chamber 125 through the oil holes in the oil outlet end of the oil outlet valve seat 41 and the oil outlet valve core 42. The oil outlet connector 45 is installed at the oil outlet chamber 125. One end of the oil outlet connector 45 is screwed into the oil outlet chamber 125 and has a sealing ring between the outer wall and the oil outlet chamber 125. The other end of the oil outlet connector 45 extends out of the shell 11 and is rotatably connected to the connecting seat 27. The connecting seat 27 can rotate 360° relative to the oil outlet connector 45. The oil outlet connector 45 has an oil passage 451 inside. The oil in the oil outlet chamber 125 can enter the oil passage 272 in the connecting seat 27 through the oil passage 451.
[0042] The pressure relief valve 50 is installed in the oil return cavity 127, and the pump body 121 is provided with an oil return port 128 at the oil return cavity 127, which is communicated with the oil storage part 18 and leads to the oil bag 18. The oil return channel 126 is communicated with the oil storage part 18 at one end and communicated with the oil inlet cavity 125 at the other end. The pressure relief valve 50 has a pressure relief valve seat 51, a pressure relief valve needle 52, a pressure relief piston 53, a pressure relief spring 54 and a pressure regulating spring seat 55. The pressure relief valve seat 51 is screwed into the oil return channel 126 and has an oil return hole 511 in the middle. The pressure relief valve needle 52 is installed in the oil return cavity 127, and the needle tip end of the pressure relief valve needle 52 can block the oil return hole 511. The pressure relief piston 53 is arranged between the outer periphery of the pressure relief valve needle 52 near the needle tip end and the inner wall of the oil return cavity 127. The pressure relief piston 53 is sealed with a sealing ring. The pressure regulating spring seat 55 is arranged below the pressure relief piston 53 in the oil return cavity 127, and the pressure relief spring 54 is arranged in the pressure regulating spring seat 55. The pressure relief valve needle 52 penetrates through the pressure relief spring 54. When the pressure relief valve 50 is not opened, the needle tip end of the pressure relief valve needle 52 blocks the oil return hole 511, and the oil return port 128 is separated from the oil return cavity 127 by the pressure relief piston 53. When the pressure in the oil inlet cavity 125 reaches a preset value, the oil enters the oil return hole 511 of the pressure relief valve seat 51 through the oil return channel 126, pushes the pressure relief valve needle 52 away and moves downward, and the oil enters the oil return cavity 127 through the oil return hole 511. As the pressure relief piston 53 moves downward with the pressure relief valve needle 52, the oil return port 128 is exposed, and the oil flows into the oil bag 18 through the oil return port 128 for recovery, and the pressure relief is completed.
[0043] In order to facilitate manual pressure relief, a handle 56 can be arranged at the end of the pressure relief valve needle 52 away from the needle tip end and extending out of the pressure regulating spring seat 55. One end of the handle 56 is clamped on the pressure relief valve needle 52, and the other end is matched with the pressure relief button 57 arranged on the shell 11. When the pressure relief button 57 is pulled down, the handle 56 acts on the pressure relief valve needle 52 to open the pressure relief valve needle 52 for pressure relief. Figure 5
[0044] As shown in Figure 6 and Figure 7 , the pump body 121 is also provided with a plunger assembly 60 at the oil inlet cavity 123. The plunger assembly 60 has a plunger sleeve 61, a plunger rod 62, a plunger sealing gasket 63 and a plunger spring 64. The plunger sleeve 61 is screwed into the pump body 121. The plunger rod 62 is movably arranged in the plunger sleeve 61 through the plunger spring 64. One end of the plunger rod 62 penetrates through the top end of the plunger sleeve 62 and extends into the oil inlet cavity 123, and is sleeved with the plunger sealing gasket 63. The other end of the plunger rod 62 extends out of the pump body 121. During operation, under the action of the driving motor, the plunger rod 62 moves along the axis direction of the oil inlet cavity 123 to control the oil inlet valve 30 to open for oil inlet.
[0045] In the embodiment, the motor base 13 is in the shape of a hollow cylindrical shell, and the inner wall of the upper end of the motor base 13 is internally threaded. The lower end of the pump body 121 is externally threaded, and the pump body 121 is connected to the motor base 13 by screwing. The motor base 13 is internally provided with a drive assembly 70, which has a pair of rollers 71, a retainer 72, a push wheel 73, and a return spring 74. The pair of rollers 71 are mounted on the output shaft 141 of the drive motor 14 through the retainer 72 and can rotate under the drive of the output shaft 141. The push wheel 73 is located in front of the rollers 71 and has a receiving cavity on the side facing the rollers. The rollers are located in the receiving cavity, and the inner wall of the receiving cavity has an acting portion matched with the rollers 71. The acting portion is a curved inclined surface 731. When the rollers 71 roll, the outer edge of the rollers 71 contacts the inclined surface 731, so that the push wheel 73 can move along the axial direction. The side of the push wheel 73 facing the pump body 121 forms a planar acting end surface 732, which is matched with the end of the plunger rod 62 extending out of the pump body 121. When the push wheel 73 moves toward the pump body 121 under the action of the rollers 71, it can push the plunger rod 62 to move toward the oil inlet cavity 123. The return spring 74 is further arranged between the acting end surface 732 of the push wheel 73 and the bottom of the pump body 121, which helps to reset the push wheel 73. In combination with the action of the plunger spring 64, the plunger rod 62 can move back and forth, thereby changing the closed volume in the oil inlet cavity 123 and enabling the oil inlet valve 30 to open to realize oil inlet.
[0046] The end of the motor base 13 away from the pump body 121 is fixed with the drive motor 14, and the motor base 13 and the drive motor 14 are further provided with a heat dissipation pad 19, which can quickly and effectively dissipate heat from the motor to ensure normal use of the motor. At the same time, the position where the motor 14 is installed is basically at the hand-held part of the shell 11. When in use, the user usually holds the shell 11 at this part to work. The addition of the heat dissipation pad 19 can better avoid the influence of overheating of the motor on the user's hand feeling.
[0047] <Embodiment 2>
[0048] In this embodiment, the fixed mold 22 has two fixed jaws 221, namely a first fixed jaw 221a and a second fixed jaw 221b. The movable mold 23 has two movable jaws 231, namely a first movable jaw 231a corresponding to the first fixed jaw 221a and a second movable jaw 231b corresponding to the second fixed jaw 221b. As shown in the figure, the first fixed jaw 221a and the first movable jaw 231a are arranged on the same side of the fixed mold 22, and the second fixed jaw 221b and the second movable jaw 231b are arranged on the opposite side of the fixed mold 22. Figure 10As shown, the distance between the first fixed jaw and the first movable jaw is denoted as L1 (the straight-line distance in the axial direction), and the distance between the second fixed jaw and the second movable jaw is denoted as L2 (the straight-line distance in the axial direction), where L1 > L2. The hydraulic cylinder 21 is rotatably arranged on the connecting seat 27. During use, the user can hold the fixed mold 22 or the movable mold 23 as needed and rotate the hydraulic cylinder 21 by 180° to reverse the direction of the upper and lower groups of jaws, so as to achieve the tightening connection of pipes with different requirements. The rotation range of the hydraulic cylinder 21 can be set to 0° - 360°.
[0049] In addition, the first fixed jaw 221a and the second fixed jaw 221b (the first movable jaw 231a and the second movable jaw 231b) can also be set to different radial dimensions to adapt to pipes of different sizes for use.
[0050] <Example 3>
[0051] This embodiment proposes a refrigerant pipe tightening connection device for connecting the refrigerant pipe 81. As Figure 11 shown, it includes a pipe fitting tightening tool 100 and a joint assembly 80. The pipe fitting tightening tool 100 is the pipe fitting tightening tool 100 described in the above Embodiments 1 and 2. As Figure 12 shown, the joint assembly 80 has a pipe joint 82, a sliding sleeve 83, and a lining 84. The outer periphery of the pipe joint 82 has a pair of outwardly protruding convex rings 821. An annular groove 822 is formed between the two convex rings 821. The width of the annular groove 822 is adapted to the axial thickness of the fixed jaw 221. When the pipe joint 82 is placed on the fixed jaw 221, the annular groove 822 is clamped at the fixed jaw 221, and the convex ring 821 close to the movable jaw side just abuts against the front positioning step 222 (when placed in the reverse direction, the convex ring 821 abuts against the rear positioning step 232). One end of the lining 84 has a convex edge 841 protruding outward for fitting against the port of the refrigerant pipe 81. The sliding sleeve 83 is used to sleeve the outer periphery of the pipe joint 82. The outer end of the pipe joint 82 has an insertion portion 821 for inserting into the sliding sleeve 83, and the outer diameter of the insertion portion 821 is denoted as R1; the sliding sleeve 83 has a sliding sleeve inlet 831 corresponding to the insertion portion 821, and the aperture of the sliding sleeve inlet 831 is denoted as R2; one end of the sliding sleeve 83 away from the sliding sleeve inlet 831 forms a sliding sleeve fixing section 832, and the aperture of the sliding sleeve fixing section 832 is denoted as R3. As Figure 13 shown, R3 < R1 < R2. The insertion portion 821 needs to be smoothly inserted into the sliding sleeve inlet 831, so R1 < R2. When R3 < R1 is satisfied, the connection of the pipe can be made more firmly when tightened.
[0052] In operation, the inner liner 84 is first inserted into one end of the refrigerant pipe 81, with the convex edge 841 exposed outside the refrigerant pipe 81, then the pipe joint 82 is sleeved on the end of the refrigerant pipe 81 with the inner liner 84, the sleeve 83 is sleeved on the outer periphery of the pipe joint 82 from the other end of the refrigerant pipe 81, and the annular groove 822 of the pipe joint 82 is aligned with the fixed jaw 221 or the movable jaw 231 and clamped in. At this time, as shown in Figure 13 the sleeve 83 is located in front of the movable jaw 231, the pipe tightening tool 100 is started, the movable die 23 is moved toward the end where the fixed die 21 is located under the drive of the piston rod 21, the rear positioning step 232 in front of the movable jaw 231 gradually contacts the sleeve 83 and pushes the sleeve 83 forward, so that the sleeve 83 is firmly clamped on the outside of the pipe joint 82, thereby realizing the tightening connection between the pipe joint 82 and the refrigerant pipe 81. When two refrigerant pipes 81 need to be connected, the other refrigerant pipe 81 is installed with the inner liner 84 and inserted into the other end (the end not connected with the refrigerant pipe 81) of the pipe joint 82, and the other sleeve 83 is sleeved, and the above steps are repeated, so that the two refrigerant pipes 81 are connected through one pipe joint 82.
[0053] The above embodiments are only used for illustrating the specific implementation of the present application, and the present application is not limited to the description range of the above embodiments.
Claims
1. A pipe fitting tightening tool, characterized by, The utility model relates to a tool body, a working part installed on the tool body and working under the drive of the tool body, and a connecting seat connected to the tool body, a hydraulic cylinder installed on the connecting seat and internally movably provided with a piston rod and a piston spring, a fixed die fixedly arranged at the front end of the hydraulic cylinder and containing a fixed jaw, a movable die movably arranged outside the hydraulic cylinder and containing a movable jaw, and a connecting piece connecting the movable die with the piston rod to enable the movable die to move along with the piston rod. The fixed die is provided with a front positioning step on the side of the fixed jaw facing the movable die, and the movable die is provided with a rear positioning step on the side of the movable jaw facing the fixed die. The fixed jaw has a front end face arranged on the side away from the movable die, and the axis of the piston rod is perpendicular to the plane where the front end face is located, and a rear end face arranged on the side close to the movable die, and the axis of the piston rod forms an angle α with the plane where the rear end face is located, wherein 85°≤α<90°. The tool body has an outer shell, and an oil pump, a motor base and a driving motor are sequentially arranged in the outer shell in a straight line direction. One end of the motor base is fixed with the driving motor, the other end is fixed with the oil pump, and a heat dissipation gasket is arranged between the motor base and the driving motor. An oil passage is formed in the connecting seat. The oil pump has a pump body, an oil storage part is arranged between the outer periphery of the pump body and the inner wall of the outer shell, and an oil inlet, an oil inlet cavity, an oil outlet, an oil outlet cavity, an oil return passage and an oil return cavity are formed in the pump body. An oil inlet valve is arranged in the oil inlet to connect the oil storage part and the oil inlet cavity. An oil outlet valve is arranged in the oil outlet to connect the oil inlet cavity and the oil outlet cavity.
2. A pipe tightening tool according to claim 1, characterised in that An oil outlet connector is arranged in one end of the oil outlet cavity and is rotatably connected to the connecting seat outside the outer shell. A pressure relief valve is arranged in the oil return cavity to connect the oil return passage and the oil storage part. A filter screen is arranged at the outer end of the oil inlet, and a fixing piece is arranged on both sides of the filter screen to cover at least part of the edge of the filter screen.
3. A pipe tightening tool according to claim 1 or 2, characterised in that A plunger assembly is arranged at the oil inlet cavity of the pump body, and the plunger assembly has a plunger sleeve fixedly screwed in the pump body, a plunger rod arranged in the plunger sleeve and extending into the oil inlet cavity at one end and extending out of the pump body at the other end, and a plunger sealing gasket sleeved on the outer periphery of the end of the plunger rod extending out of the plunger sleeve. Under the action of the driving motor, the plunger rod moves along the axis direction of the oil inlet cavity.
4. A pipe tightening tool according to claim 3, wherein A driving assembly is arranged in the motor base, and the driving assembly has a roller arranged on the output shaft of the driving motor through a retainer and rotating under the drive of the output shaft, a push wheel having an acting part matched with the roller and moving along the axis direction under the drive of the roller, and a return spring arranged between the push wheel and the pump body. 5. A pipe tightening tool according to claim 4, wherein 6. The pipe make-up tool of claim 4, wherein, 7. A pipe tightening tool according to claim 6, wherein The end surface of the pushing wheel is attached to one end of the plunger rod extending out of the pump body, and the pushing wheel is moved towards the pump body under the action of the roller, thereby pushing the plunger rod to move towards the oil inlet cavity.
8. A pipe tightening tool according to claim 1 or 2, characterized in that The hydraulic cylinder is rotatably installed on the connecting seat, and the fixed die has two fixed jaws, namely a first fixed jaw and a second fixed jaw. The movable die has two movable jaws, namely a first movable jaw corresponding to the first fixed jaw and a second movable jaw corresponding to the second fixed jaw. The distance between the first fixed jaw and the first movable jaw is L1, and the distance between the second fixed jaw and the second movable jaw is L2, wherein L1>L2.
9. A refrigerant line set-up connection device characterized by, It comprises: A joint assembly having a pipe joint for connecting a refrigerant pipe, A pipe tightening tool for tightening the pipe joint and the refrigerant pipe together; The tightening tool is the pipe tightening tool according to any one of claims 1-8, and the pipe joint has a convex ring protruding outward, which abuts against the front positioning step or the rear positioning step.
10. The refrigerant line recovery coupling device of claim 9, wherein, The joint assembly further has an inner liner and a sliding sleeve, the inner liner is inserted into the end of the refrigerant pipe close to the pipe joint, and the sliding sleeve is sleeved on the outer periphery of the pipe joint; The outer end of the pipe joint has an insertion part for inserting into the sliding sleeve, and the outer diameter of the insertion part is R1, the sliding sleeve corresponds to the insertion part and has a sliding sleeve inlet with a hole diameter of R2, and the end of the sliding sleeve away from the sliding sleeve inlet forms a sliding sleeve fixed section with a hole diameter of R3, wherein R3