An oil passage anti-freezing device

Abstract

The application provides an oil path anti-freezing device, characterized by comprising an inlet plate arranged on one side of an oil pipe and a return plate arranged on the other side of the oil pipe, the side of the inlet plate and the return plate abutting each other, so that the inlet plate and the outside of the oil pipe form an inlet channel, the return plate and the outside of the oil pipe form a return channel, a return ring is arranged on the outer periphery of one end of the oil pipe, a ring cavity is arranged in the return ring, the ring cavity is communicated with the inlet channel through a first liquid hole, the ring cavity is communicated with the return channel through a second liquid hole, an inlet is arranged on the side of the inlet plate away from the return ring, and a return port is arranged on the side of the return plate away from the return ring; the application improves the anti-freezing effect of the oil path, does not need to modify the oil path body, can conveniently add the anti-freezing structure on the oil path, and has the effect of convenient disassembly and assembly.

Description

Technical Field

[0001] This invention relates to the field of oil circuit equipment, and in particular to an oil circuit antifreeze device. Background Technology

[0002] Currently, oil supply pipelines are common in various types of machinery, used to ensure stable oil supply. However, in colder seasons or regions, such as North China, Northeast China, and Northwest my country, temperatures can drop to -5°C to -60°C after winter sets in, making the oil in the oil supply pipelines prone to freezing and solidification, which can lead to oil supply stoppage or even pipeline rupture.

[0003] Existing methods for preventing oil pipes from freezing typically require modifications to the oil circuit itself. For example, heaters can be installed at fixed points in the oil circuit, and the heating temperature of the heaters can be uniformly controlled by a temperature control device. However, the installation of heaters requires modifications to the oil circuit design, which is quite complicated. If the oil circuit is not modified, the current method usually only involves wrapping the outside of the oil circuit with insulation material. However, the insulation effect of the insulation material is limited and it is difficult to achieve the temperature control effect of the heater. Summary of the Invention

[0004] The purpose of this invention is to provide an oil circuit antifreeze device that improves the antifreeze effect of the oil circuit, allows for the convenient installation of an antifreeze structure on the oil circuit without modifying the oil circuit itself, and has the effect of easy disassembly and assembly.

[0005] To solve the above-mentioned technical problems, the present invention provides an oil circuit antifreeze device, including an inlet plate covering one side of the oil pipe and a return plate covering the other side of the oil pipe. The inlet plate and the return plate abut against each other so that the inlet plate and the outside of the oil pipe form an inlet channel, and the return plate and the outside of the oil pipe form a return channel. A return ring is sleeved on the outer periphery of one end of the oil pipe. The return ring has an annular cavity. The annular cavity is connected to the inlet channel through a first liquid hole and to the return channel through a second liquid hole. The inlet plate has an inlet on the side away from the return ring, and the return plate has a return outlet on the side away from the return ring.

[0006] Furthermore, the liquid inlet plate has a first through hole on the side near the return ring, and the liquid return plate has a second through hole on the side near the return ring. An adjusting ring is rotatably installed inside the ring cavity. The adjusting ring has a first adjusting hole that matches the first liquid hole and a second adjusting hole that matches the second liquid hole, so that the opening and closing state of the ring cavity can be controlled when the adjusting ring rotates relative to the ring cavity.

[0007] Furthermore, both the first and second through holes are detachably fitted with plugs.

[0008] Furthermore, a rotating ring is fitted around the outer periphery of the return ring, and a through groove is provided on the side of the return ring near the rotating ring. The connecting rod passes through the through groove so that the rotating ring and the adjusting ring are connected by the connecting rod.

[0009] Furthermore, an indicator groove is provided on the outer circumference of the rotating ring to indicate the opening and closing status of the ring cavity, and a positioning block is provided on the inner side of the return ring, and the positioning block is fastened in the liquid inlet channel and the liquid return channel.

[0010] Furthermore, a positioning ring is fitted around the outer periphery of the end of the oil pipe away from the return ring, and an insert plate is provided on one side of the positioning ring. Slots are provided on the sides of both the inlet plate and the return plate so that the insert plate is inserted into the slot when the positioning ring positions the inlet plate and the return plate.

[0011] Furthermore, an air cavity is provided inside the positioning ring, and an opening structure is provided on one side of the air cavity, with the opening structure facing the outer wall of the oil pipe. An elastic airtight element is provided at the opening structure.

[0012] Furthermore, an air hole is provided on one side of the positioning ring, and an air-blocking rod is telescopically installed at the air hole. A guide tube is provided inside the air cavity, and the air-blocking rod can move axially relative to the guide tube. An elastic element is connected between the air-blocking rod and the guide tube. The end of the air-blocking rod has a chamfered structure, and several air grooves are provided circumferentially at the chamfered structure.

[0013] Furthermore, a first leak-proof groove is provided on the side of the liquid inlet plate, and a second leak-proof groove is provided on the side of the liquid return plate, so that when the sides of the liquid inlet plate and the liquid return plate abut against each other, the first leak-proof groove and the second leak-proof groove form a V-shaped groove.

[0014] Furthermore, a stop block is provided on the side of the liquid inlet plate opposite to the side of the liquid return plate. The stop block is located in a V-shaped groove, and a detection element for detecting leakage is provided on one side of the positioning ring. The detection element is also located in the V-shaped groove, so that the detection element and the stop block are correspondingly arranged.

[0015] The beneficial effects of this invention are as follows: When installing antifreeze equipment on the oil circuit, the inlet plate and return plate are fitted onto the outer circumference of the oil pipe, so that the inlet plate and return plate are laid on the outer circumference of the oil pipe, forming an inlet channel and a return channel. At this time, hot water or other liquids with a certain temperature are input into the inlet channel through the inlet port to heat the outer circumference of the oil pipe. At the same time, the liquid is transported to the annular cavity through the first liquid hole, and the liquid is reversed to the return channel through the second liquid hole, so that the entire outer circumference of the oil pipe is heated by the liquid. Then the liquid is discharged from the return port, so that the liquid forms a circulating flow path, ensuring the fluidity of the hot water, thereby improving the antifreeze effect on the oil pipe. Moreover, since the inlet plate and return plate and other structures can be directly installed onto the outer circumference of the oil pipe without modifying the oil pipe itself, the installation of this antifreeze device is relatively convenient, and it effectively ensures the convenience of subsequent disassembly of the antifreeze device, so that the antifreeze device can be easily disassembled after the ambient temperature rises, thereby improving the heat dissipation effect of the oil pipe. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention.

[0017] Figure 2 This is the present invention. Figure 1 A magnified view of a portion of point A in the middle.

[0018] Figure 3 This is the present invention. Figure 1 A magnified view of a section at point B.

[0019] Figure 4 This is a side view of the present invention.

[0020] Figure 5 This is the present invention. Figure 4 Cross-sectional view along line AA.

[0021] Figure 6 This is the present invention. Figure 5 A magnified view of a section at point C.

[0022] Figure 7 This is the present invention. Figure 5 A magnified view of a section at point D.

[0023] Figure 8 This is the present invention. Figure 5 A magnified view of a section at point E in the middle.

[0024] Figure 9 This is the present invention. Figure 8 A magnified view of a section at point F.

[0025] Figure 10 This is a schematic diagram of the connection between the liquid inlet plate and the liquid return plate in this invention.

[0026] Figure 11This is a schematic diagram of the reflux ring structure in this invention.

[0027] Figure 12 This is a schematic diagram after removing the inlet plate and return plate in this invention.

[0028] Reference numerals: 1. Oil pipe; 2. Inlet plate; 3. Return plate; 4. Inlet channel; 5. Return channel; 6. Return ring; 7. Ring cavity; 8. First liquid hole; 9. Second liquid hole; 10. Inlet; 11. Return port; 12. First through hole; 13. Second through hole; 14. Adjusting ring; 15. First adjusting hole; 16. Second adjusting hole; 17. Plug; 18. Rotating ring; 19. Through groove; 20. Connecting rod; 21. Indicator groove; 22. Positioning block; 23. Positioning ring; 24. Insert plate; 25. Slot; 26. Air cavity; 27. Elastic airtight component; 28. Air hole; 29. ​​Air-blocking rod; 30. Guide tube; 31. Elastic component; 32. Air groove; 33. First leak-proof groove; 34. Second leak-proof groove; 35. Stop block; 36. Detection component. Detailed Implementation

[0029] The technical solutions of the embodiments 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, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0030] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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. Therefore, the above terms should not be construed as limiting this invention.

[0031] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0032] like Figure 1-12The present invention provides an oil circuit antifreeze device, including an inlet plate 2 covering one side of an oil pipe 1 and a return plate 3 covering the other side of the oil pipe 1. The inlet plate 2 and the return plate 3 abut against each other so that the inlet plate 2 and the outside of the oil pipe 1 form an inlet channel 4, and the return plate 3 and the outside of the oil pipe 1 form a return channel 5. A return ring 6 is sleeved on the outer periphery of one end of the oil pipe 1. An annular cavity 7 is opened inside the return ring 6. The annular cavity 7 is connected to the inlet channel 4 through a first liquid hole 8 and to the return channel 5 through a second liquid hole 9. The inlet plate 2 has an inlet port 10 on the side away from the return ring 6, and the return plate 3 has a return port 11 on the side away from the return ring 6.

[0033] When installing antifreeze equipment on the oil pipe, the inlet plate and return plate are fitted onto the outer circumference of the oil pipe, forming an inlet channel and a return channel. Hot water or other liquids of a certain temperature are then introduced into the inlet channel through the inlet port to heat the outer circumference of the oil pipe. Simultaneously, the liquid is transported to the annular cavity through the first liquid hole and flows back into the return channel through the second liquid hole, ensuring that the entire outer circumference of the oil pipe is heated by the liquid. The liquid is then discharged from the return port, creating a circulating flow path to maintain the fluidity of the hot water and improve the antifreeze effect on the oil pipe. Since the inlet plate and return plate can be directly installed onto the outer circumference of the oil pipe without modification, the antifreeze device is easy to install and ensures convenient disassembly. This allows for easy removal of the antifreeze device after the ambient temperature rises, improving the heat dissipation effect of the oil pipe.

[0034] In one embodiment of this solution, hot water is transported from the inlet to the inlet channel and circulated back from the return channel to the return outlet, thus forming an antifreeze flow path around the oil pipe. The inlet is connected to the outlet of an external hot water supply device, and the return outlet is connected to the inlet of the external hot water supply device. The hot water supply device is equipped with a water pump to facilitate the transport and return of hot water. Since a heater can be installed inside the hot water supply device, the temperature of the hot water can be controlled, and the heater does not need to be installed inside the oil circuit, which makes the oil circuit modification process too complicated.

[0035] It is worth mentioning that the inlet plate and return plate in this solution have a semi-circular cross-section (the overall shape of the inlet plate and return plate is not necessarily a straight cylindrical structure as shown in the schematic diagram of this solution; it can also be designed according to the shape of the outer periphery of different oil pipes, as long as it is ensured that the sides of the inlet plate and return plate can be completely laid on the outer periphery of the oil pipe). This allows the inlet plate and return plate to be spliced ​​together to form a circular structure that wraps around the outer periphery of the oil pipe after installation. Furthermore, both sides of the inlet plate and both sides of the return plate are sealed to the pipe wall of the oil pipe through sealing gaskets and other sealing components to avoid direct communication between the inlet channel and the return channel.

[0036] Specifically, when the sides of the inlet plate and the return plate abut against each other, the sides of the inlet plate and the return plate are fixed by magnetic attraction, bolt connection, or snap-fit, ensuring that the positions of the inlet plate and the return plate relative to the oil pipe are stable.

[0037] When installing the oil circuit antifreeze device in this solution, one end of the oil pipe that needs to be antifreeze is disconnected from the oil circuit, leaving the oil pipe in a state where one end is disconnected and the other end is still installed. At this time, the return ring and subsequent positioning ring can be fitted onto the outer circumference of the oil pipe. Then, the disconnected end of the oil pipe is reinstalled into the oil circuit, and the oil pipe can continue to be used. When antifreeze is required, simply lay the inlet plate and return plate onto the outer circumference of the oil pipe to quickly complete the installation of the antifreeze device. When antifreeze is not required, the inlet plate and return plate are disconnected from the oil pipe, and the return ring and positioning ring are left on the outer circumference of the oil pipe to ensure that the antifreeze device can be quickly reinstalled later.

[0038] Preferably, the liquid inlet plate 2 has a first through hole 12 on the side near the return ring 6, the liquid return plate 3 has a second through hole 13 on the side near the return ring 6, and an adjusting ring 14 is rotatably arranged in the ring cavity 7. The adjusting ring 14 has a first adjusting hole 15 that matches the first liquid hole 8 and a second adjusting hole 16 that matches the second liquid hole 9, so that when the adjusting ring 14 rotates relative to the ring cavity 7, the opening and closing state of the ring cavity 7 is controlled.

[0039] Specifically, since the overall oil circuit usually includes a large number of oil pipes, which are connected by tees, valves, pipe interfaces, etc., to ensure that the antifreeze device of this solution can be installed on all oil pipes that require antifreeze, this solution opens a first through hole and a second through hole. When there are many oil pipes in the oil circuit, the antifreeze device of this solution is fitted around the periphery of all oil pipes that require antifreeze. The first through hole is connected to the inlet of the adjacent oil pipe, and the second through hole is connected to the return port of the adjacent oil pipe, so that several inlet channels are interconnected and several return channels are interconnected. At this time, only the annular cavity of the last section of the oil pipe needs to be opened (the first and second through holes of the last section of the oil pipe are closed), and the annular cavities of the remaining oil pipes are all closed. This allows the hot water circulation path to flow through all oil pipes, ensuring the antifreeze effect of all oil pipes. Hot water can be supplied and discharged through the inlet and return port at the first section of the oil pipe, so that the pipelines connected to the external hot water supply equipment are gathered in one place, which is convenient for subsequent maintenance and inspection.

[0040] When it is necessary to adjust the opening and closing state of the ring cavity, the positions of the first adjustment hole and the second adjustment hole are rotated by adjusting the ring. When the first liquid hole and the first adjustment hole are misaligned and the second liquid hole and the second adjustment hole are misaligned, the ring cavity is in a closed state, which ensures that hot water flows out from the first through hole and flows back from the second through hole.

[0041] Preferably, both the first through hole 12 and the second through hole 13 are detachably equipped with plugs 17.

[0042] Specifically, when the first and second through holes are not needed, the plug is inserted into the through hole position to block the first and second through holes, thus ensuring that hot water flows into the annular cavity.

[0043] Preferably, a rotating ring 18 is sleeved on the outer periphery of the return ring 6, and a through groove 19 is opened on the side of the return ring 6 near the rotating ring 18. The connecting rod 20 passes through the through groove 19 so that the rotating ring 18 and the adjusting ring 14 are connected by the connecting rod 20.

[0044] Specifically, when it is necessary to rotate the adjusting ring, the rotating ring on the outer circumference of the return ring can be rotated, so that the rotating ring drives the adjusting ring to rotate through the connecting rod, thereby ensuring convenient control of the opening and closing state of the ring cavity.

[0045] Preferably, the rotating ring 18 has an indicator groove 21 on its outer periphery to indicate the opening and closing status of the ring cavity 7, and the return ring 6 has a positioning block 22 on its inner side, and the positioning block 22 is fastened in the liquid inlet channel 4 and the liquid return channel 5.

[0046] Specifically, when the user rotates the rotating ring to control the opening and closing of the ring cavity, the opening and closing status of the ring cavity can be conveniently and intuitively understood by observing the indicator groove.

[0047] Meanwhile, during the installation of the inlet plate and the return plate, the positioning block is fastened into the inlet channel and the return channel to ensure the accurate relative position between the return ring and the inlet plate and the return plate, thereby improving the flow stability of the first liquid hole and the second liquid hole.

[0048] Preferably, a positioning ring 23 is fitted around the outer periphery of the end of the oil pipe 1 away from the return ring 6, and an insert plate 24 is provided on one side of the positioning ring 23. Slots 25 are provided on the sides of the inlet plate 2 and the return plate 3, so that when the positioning ring 23 positions the inlet plate 2 and the return plate 3, the insert plate 24 is inserted into the slot 25.

[0049] Specifically, when installing the inlet plate and the return plate, the sides of the inlet plate and the return plate are pressed together, and then the insert plate on one side of the positioning ring is inserted into the slot, so that the insert plate limits the radial movement of the inlet plate and the return plate to ensure the stability of the hot water circulation path.

[0050] Preferably, the positioning ring 23 has an air cavity 26 inside, and the air cavity 26 has an opening structure on one side, with the opening structure facing the outer wall of the oil pipe 1. An elastic airtight element 27 is provided at the opening structure.

[0051] Specifically, since both the inlet and outlet are located near the positioning ring, and the water pressure at the inlet and outlet is relatively high (inlet pressure and suction pressure), this solution sets up an air chamber and an elastic airtight component to ensure the sealing effect at the positioning ring. After the positioning ring is installed, the air chamber is inflated, causing the elastic airtight component to expand towards the outer wall of the oil pipe, thereby making the elastic airtight component fit against the outer wall of the oil pipe and improving the sealing effect between the positioning ring and the oil pipe.

[0052] Among them, the elastic airtight component can be made of materials such as rubber that have a certain elastic deformation capability.

[0053] Preferably, an air hole 28 is provided on one side of the positioning ring 23, and an air-blocking rod 29 is telescopically provided at the air hole 28. A guide tube 30 is provided inside the air cavity 26. The air-blocking rod 29 can move axially relative to the guide tube 30, and an elastic element 31 is connected between the air-blocking rod 29 and the guide tube 30. The end of the air-blocking rod 29 has a chamfered structure, and several air grooves 32 are provided circumferentially at the chamfered structure.

[0054] Specifically, the gas is blocked at the air hole by the air-blocking rod to prevent the gas in the air chamber from escaping from the air hole. When the air chamber needs to be inflated, the inflation tube of the external air supply device is inserted into the air hole to push the air-blocking rod, causing the air-blocking rod to retract along the guide tube, so that the end of the inflation tube enters the air chamber. At this time, due to the setting of several air grooves, several gaps are formed at the contact position between the end of the inflation tube and the air-blocking rod, so that the air chamber can be inflated through several gaps. After inflation is completed, the air-blocking rod is reset with the help of the elastic element.

[0055] The elastic element adopts a spring structure.

[0056] It is worth mentioning that, because the end of the air-locking rod has a chamfered structure, the end of the inflation tube can be snapped into the chamfered structure, which improves the connection stability between the inflation tube and the air-locking rod.

[0057] Preferably, the inlet plate 2 has a first anti-leakage groove 33 on one side and the return plate 3 has a second anti-leakage groove 34 on one side, so that when the inlet plate 2 and the return plate 3 are in contact, the first anti-leakage groove 33 and the second anti-leakage groove 34 form a V-shaped groove.

[0058] Specifically, because the inlet plate and return plate are limited and sealed by the positioning ring and the return ring at both ends, there is usually no liquid leakage from the two ends. When liquid leakage occurs at the point where the inlet plate and return plate meet on the side, the V-groove structure allows the leaking liquid to have a large contact area at the V-groove, making it easy for the liquid surface tension to adhere the leaking liquid to the V-groove, thereby effectively mitigating the liquid leakage.

[0059] Preferably, a stop block 35 is provided on the side of the liquid inlet plate 2 opposite to the side of the liquid return plate 3. The stop block 35 is located in a V-shaped groove, and a detection element 36 for detecting leakage is provided on one side of the positioning ring 23. The detection element 36 is located in a V-shaped groove, so that the detection element 36 and the stop block 35 are correspondingly arranged.

[0060] Specifically, the position of the stop is monitored in real time by the detection device. When the leaking liquid appears in the V-groove, the detection light of the detection device will be blocked by the leaking liquid, making it impossible for the detection device to detect the position of the stop (such as the principle of elevator door sensing). At this time, the detection device will prompt the user that a leak has occurred, so as to ensure that the user can detect the leak in time and carry out maintenance.

[0061] The detection components can include infrared sensors, position sensors, and spacing detectors.

[0062] This invention is not limited to the preferred embodiments described above. Anyone can derive other products in various forms under the guidance of this invention. However, regardless of any changes in shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this invention.

Claims

1. An oil circuit antifreeze device, characterized in that: It includes an inlet plate (2) covering one side of the oil pipe (1) and a return plate (3) covering the other side of the oil pipe (1). The inlet plate (2) and the return plate (3) abut against each other so that the inlet plate (2) and the outside of the oil pipe (1) form an inlet channel (4) and the return plate (3) and the outside of the oil pipe (1) form a return channel (5). A return ring (6) is sleeved on the outer periphery of one end of the oil pipe (1). An annular cavity (7) is opened inside the return ring (6). The annular cavity (7) is connected to the inlet channel (4) through a first liquid hole (8). The annular cavity (7) is connected to the return channel (5) through a second liquid hole (9). An inlet port (10) is opened on the side of the inlet plate (2) away from the return ring (6), and a return port (11) is opened on the side of the return plate (3) away from the return ring (6). The liquid inlet plate (2) has a first through hole (12) on the side near the return ring (6), and the liquid return plate (3) has a second through hole (13) on the side near the return ring (6). An adjusting ring (14) is rotatably arranged in the ring cavity (7). The adjusting ring (14) has a first adjusting hole (15) matching the first liquid hole (8) and a second adjusting hole (16) matching the second liquid hole (9) so that when the adjusting ring (14) rotates relative to the ring cavity (7), the opening and closing state of the ring cavity (7) is controlled. A rotating ring (18) is sleeved on the outer periphery of the return ring (6), and a through groove (19) is opened on the side of the return ring (6) close to the rotating ring (18). The connecting rod (20) passes through the through groove (19) so that the rotating ring (18) and the adjusting ring (14) are connected through the connecting rod (20). A positioning ring (23) is fitted around the outer periphery of the end of the oil pipe (1) away from the return ring (6), and a plug plate (24) is provided on one side of the positioning ring (23). Slots (25) are provided on the sides of the inlet plate (2) and the return plate (3) so that when the positioning ring (23) positions the inlet plate (2) and the return plate (3), the plug plate (24) is inserted into the slot (25). The positioning ring (23) has an air chamber (26) inside. The air chamber (26) has an opening structure on one side, and the opening structure faces the outer wall of the oil pipe (1). An elastic airtight component (27) is provided at the opening structure. A vent (28) is provided on one side of the positioning ring (23), and a gas-blocking rod (29) is telescopically provided at the vent (28). A guide tube (30) is provided inside the air cavity (26). The gas-blocking rod (29) can move axially relative to the guide tube (30), and an elastic element (31) is connected between the gas-blocking rod (29) and the guide tube (30). The end of the gas-blocking rod (29) has a chamfered structure, and several air grooves (32) are provided circumferentially at the chamfered structure.

2. The oil circuit antifreeze device according to claim 1, characterized in that: Both the first through hole (12) and the second through hole (13) are detachably fitted with plugs (17).

3. The oil circuit antifreeze device according to claim 1, characterized in that: The outer periphery of the rotating ring (18) is provided with an indicator groove (21) to indicate the opening and closing status of the ring cavity (7). The inner side of the return ring (6) is provided with a positioning block (22), and the positioning block (22) is fastened in the liquid inlet channel (4) and the liquid return channel (5).

4. The oil circuit antifreeze device according to claim 1, characterized in that: The inlet plate (2) has a first leak-proof groove (33) on its side and the return plate (3) has a second leak-proof groove (34) on its side, so that when the inlet plate (2) and the return plate (3) are in contact, the first leak-proof groove (33) and the second leak-proof groove (34) form a V-shaped groove.

5. The oil circuit antifreeze device according to claim 4, characterized in that: A stop block (35) is provided on the side of the liquid inlet plate (2) opposite to the side of the liquid return plate (3). The stop block (35) is located in a V-shaped groove. A detection element (36) for detecting leakage is provided on one side of the positioning ring (23). The detection element (36) is located in a V-shaped groove so that the detection element (36) and the stop block (35) are correspondingly arranged.

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