Automatic furnace pressure adjusting device of nitriding furnace
By designing a floating plate automatic adjustment device in a nitriding furnace, the problem of furnace pressure adjustment in the prior art depends on manual operation, and automatic and stable adjustment of furnace pressure is achieved, and operation reliability and nitriding treatment quality are improved.
Patent Information
- Application Number
- CN202421261634.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-04
- Publication Date
- 2025-05-23
- Estimated Expiration
- 2034-06-04
AI Technical Summary
The furnace pressure adjustment of existing nitriding furnaces relies on manual operation, and there are problems of operation uncertainty, safety hazards and different depths of nitriding layers.
An automatic furnace pressure adjustment device including a floating plate is designed. The floating plate can float up and down with the change of the internal air pressure of the nitriding furnace, and automatically adjust the furnace pressure to ensure that the furnace pressure remains in a stable state.
The automatic stable adjustment of the furnace pressure of the nitriding furnace is realized, which improves operating reliability, avoids safety hazards, and ensures the quality of the nitriding treatment of the piston ring.
Smart Images
Figure CN222893228U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of piston ring nitriding treatment, in particular to an automatic furnace pressure regulating device for a nitriding furnace. Background Art
[0002] The popularity of automobiles has greatly facilitated people's lives. As a key component of the engine, the piston ring is usually nitrided in a nitriding furnace during production in order to meet the functional requirements of high wear resistance and long life, so as to meet the wear resistance requirements of its outer cylindrical surface and side surfaces at the same time. Its working principle is: the workpiece is placed in the furnace as the cathode, the furnace body is used as the anode, and a small amount of ammonia, nitrogen or nitrogen-argon mixed gas is passed in, and then a certain voltage is applied between the two electrodes to ionize the nitrogen. After the nitrogen is ionized, it impacts the workpiece at a high speed, and the kinetic energy of the ions is converted into heat energy to heat the workpiece to the nitriding temperature. A part of the nitrogen that bombards the surface captures electrons and directly penetrates into the surface of the workpiece, forming Fe with a high nitrogen content in a evaporated state on the surface of the workpiece, and continuously diffuses into the interior of the workpiece, thereby achieving the purpose of nitriding.
[0003] Since the decomposition of ammonia (NH3) is reversible, a mixed gas such as NH3, N2, and H2 will be produced in the furnace. In order to meet environmental protection requirements, the mixed gas is usually fully burned at the exhaust outlet of the furnace body before being discharged into the atmosphere. In addition, a certain positive pressure needs to be maintained in the furnace to maintain a certain nitrogen potential on the surface of the nitrogen-bearing workpiece, otherwise the thickness of the nitriding layer will be uneven. However, the pressure in the furnace should not be too high, otherwise it will cause ammonia leakage and cause environmental pollution.
[0004] To this end, the existing technical solution is to install a gate valve 2 in the exhaust pipe 1 connected to the exhaust port of the nitriding furnace, and adjust the opening and closing degree of the gate valve 2 to adapt to the furnace pressure. Figure 1 shown.
[0005] The working principle of adjusting the furnace pressure is: when the furnace pressure needs to be reduced, pull the gate valve 2 in the "open" direction; when the furnace pressure needs to be maintained, push the gate valve 2 in the "close" direction.
[0006] However, since the gate valve 2 often relies on manual opening and closing, the following problems are often caused:
[0007] (1) The temperature near the gate valve 2 is high, causing the operator to be at risk of being scalded.
[0008] (2) Due to the limitation of ammonia decomposition rate, some crystals will inevitably be generated and accumulated at the lower part of the gate valve 2, which will cause the discharge port diameter to decrease. The operator needs to make multiple irregular adjustments, which has great operational uncertainty. If the furnace pressure is adjusted to a small value, the depth of the nitriding layer will be uneven, which may easily lead to defective products. If the furnace pressure is adjusted to a large value, the sealing of the furnace body will be weakened, which will cause ammonia leakage and cause harm to the surrounding environment and personnel. Utility Model Content
[0009] The purpose of the utility model is to overcome the defects and shortcomings of the prior art and to provide a furnace pressure automatic regulating device for a nitriding furnace, which can adaptively and automatically regulate the internal gas pressure of the nitriding furnace so that the furnace pressure of the nitriding furnace is maintained in a stable state. The entire regulating process does not require manual operation, so as to improve operability, avoid safety hazards, and ensure the nitriding treatment quality of the piston ring.
[0010] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0011] A furnace pressure automatic regulating device for a nitriding furnace comprises a discharge pipe fixedly connected to the exhaust gas discharge port of the nitriding furnace, characterized in that: a conical cylinder which is in communication with the discharge pipe and is larger at the top and smaller at the bottom is fixedly connected to the top of the discharge pipe, a floating plate is installed inside the conical cylinder through a supporting mechanism, and the floating plate can float up and down with the change of the gas pressure of the discharge pipe, when the floating plate naturally drops to the lowest point, the outer edge of the floating plate abuts against the inner wall of the conical cylinder to seal the conical cylinder and maintain the furnace pressure of the nitriding furnace; when the floating plate is lifted by the top pressure of the gas pressure, a pressure relief channel is formed between the outer edge of the floating plate and the inner wall of the conical cylinder to reduce the furnace pressure of the nitriding furnace.
[0012] Furthermore, two radially symmetrical U-shaped grooves are respectively provided on both sides of the upper port of the conical cylinder.
[0013] Furthermore, the supporting mechanism includes a connecting tube, a guide vertical rod, a stop block and two supporting cross rods, the upper end of the guide vertical rod is fixedly connected to the connecting tube, and the stop block is fixedly connected to the bottom end of the guide vertical rod; the two supporting cross rods are radially symmetrically arranged, one end of the two supporting cross rods are respectively fixedly connected to the two sides of the connecting tube, and the other ends of the two supporting cross rods respectively pass through the two U-shaped grooves and extend out, and the other ends of the two supporting cross rods respectively abut against the bottom surfaces of the two U-shaped grooves.
[0014] Furthermore, the floating plate is slidably mounted on the guide vertical rod, and floats up and down along the guide vertical rod between the connecting tube and the stop block.
[0015] Furthermore, the floating plate is a concave plate with a low middle portion and high surrounding portions.
[0016] Furthermore, an internal thread is provided on the inner wall of the connecting tube, and an external thread is provided on the upper end of the guide vertical rod and is screwed into the connecting tube.
[0017] Furthermore, the discharge pipe, the conical cylinder, the floating plate, the connecting cylinder and the guide vertical rod are coaxially arranged.
[0018] Furthermore, two radially symmetrical limit seats are respectively provided on the outer walls on both sides of the discharge pipe, and through holes are provided on the two limit seats.
[0019] Furthermore, the extended ends of the two supporting cross bars are respectively integrally connected with vertical bars, and the lower ends of the two vertical bars respectively pass through the two through holes and extend out, and the lower ends of the two vertical bars are provided with threaded sections and screwed with locking nuts, and the locking nuts are tightened so that the locking nuts abut against the upper surfaces of the corresponding limit seats.
[0020] Compared with the prior art, the beneficial effects of the utility model are:
[0021] The utility model adopts a floating plate that can float up and down with the change of the gas pressure of the discharge pipe (that is, the internal gas pressure of the nitriding furnace). When the internal gas pressure of the nitriding furnace is relatively low, the floating plate naturally drops to the lowest point, and the outer edge of the floating plate abuts against the inner wall of the conical cylinder, which can seal the conical cylinder, thereby ensuring that the furnace pressure of the nitriding furnace is maintained in a stable state; when the internal gas pressure of the nitriding furnace is relatively high, the floating plate is lifted by the top pressure of the gas pressure, and a pressure relief channel is formed between the outer edge of the floating plate and the inner wall of the conical cylinder, which can reduce the furnace pressure of the nitriding furnace until the furnace pressure of the nitriding furnace is restored to a stable state. The whole process is automatically adjusted without manual operation, thereby improving operability, avoiding safety hazards, and ensuring the nitriding treatment quality of the piston ring. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a structural schematic diagram of an existing nitriding furnace pressure regulating device.
[0023] Figure 2 The structure of the utility model is shown in FIG. Figure 1 .
[0024] Figure 3 The structure of the utility model is shown in FIG. Figure 2 . DETAILED DESCRIPTION
[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0026] See also Figure 2 , 3 , an automatic furnace pressure regulating device for a nitriding furnace, comprising a discharge pipe 1 fixedly connected to the exhaust gas discharge port of the nitriding furnace, a conical cylinder 3 which is connected to the discharge pipe 1 and is larger at the top and smaller at the bottom and is fixedly connected to the top of the discharge pipe 1, a floating plate 4 is installed inside the conical cylinder 3 through a supporting mechanism, and the floating plate 4 can float up and down with the change of the gas pressure of the discharge pipe 1 (that is, the internal gas pressure of the nitriding furnace), when the floating plate 4 naturally drops to the lowest point, the outer edge of the floating plate 4 abuts against the inner wall of the conical cylinder 3, which is used to block the conical cylinder 3 and maintain the furnace pressure of the nitriding furnace; when the floating plate 4 is lifted by the top pressure of the gas pressure, a pressure relief channel 5 is formed between the outer edge of the floating plate 4 and the inner wall of the conical cylinder 3, which is used to reduce the furnace pressure of the nitriding furnace.
[0027] In the utility model, two radially symmetrical U-shaped grooves 13 are respectively provided on both sides of the upper end of the conical cylinder 3 .
[0028] In the utility model, the supporting mechanism includes a connecting tube 6, a guide vertical rod 7, a stop block 8 and two supporting cross bars 9. The upper end of the guide vertical rod 7 is fixedly connected to the connecting tube 6, and the stop block 8 is fixedly connected to the bottom end of the guide vertical rod 7; the two supporting cross bars 9 are radially symmetrically arranged, one end of the two supporting cross bars 9 is respectively fixedly connected to the two sides of the connecting tube 6, and the other ends of the two supporting cross bars 9 respectively pass through the two U-shaped grooves 13 and extend out, and the other ends of the two supporting cross bars 9 respectively abut against the bottom surfaces of the two U-shaped grooves 13.
[0029] Thus, the supporting mechanism is erected in the conical cylinder 3 via the two supporting cross bars 9 .
[0030] In the utility model, the floating plate 4 is slidably mounted on the guide vertical rod 7 and floats up and down along the guide vertical rod 7 between the connecting tube 6 and the stop block 8 .
[0031] Therefore, when the internal air pressure of the nitriding furnace is relatively low, under the action of gravity, the floating plate 4 naturally drops to the lowest point along the guide vertical rod 7. At this time, the outer edge of the floating plate 4 abuts against the inner wall of the conical cylinder 3 to seal the conical cylinder 3, thereby ensuring that the furnace pressure of the nitriding furnace is maintained in a stable state.
[0032] When the internal gas pressure of the nitriding furnace is relatively high, the floating plate 4 is lifted along the guide vertical rod 7 by the top pressure of the gas pressure. At this time, a pressure relief channel 5 is formed between the outer edge of the floating plate 4 and the inner wall of the conical cylinder 3. The gas is discharged through the pressure relief channel 5, which can reduce the furnace pressure of the nitriding furnace until the furnace pressure of the nitriding furnace returns to a stable state.
[0033] In the utility model, the floating plate 4 is a concave plate with a low middle portion and high surrounding portions, which is beneficial to improving the sensitivity of the floating plate 4 .
[0034] In the utility model, an inner wall of the connecting tube 6 is provided with an internal thread, and an upper end of the guide vertical rod 7 is provided with an external thread and is screwed into the connecting tube 6 .
[0035] Thus, while the upper end of the guide vertical rod 7 is fixedly connected to the connecting tube 6, the guide vertical rod 7 is rotated to move it up and down, thereby driving the floating plate 4 to move up and down, and adjusting the height of the floating plate 4 to meet the furnace pressure required to be maintained in the nitriding furnace.
[0036] In the utility model, the discharge pipe 1, the conical cylinder 3, the floating plate 4, the connecting cylinder 6 and the guide vertical rod 7 are coaxially arranged, so that the floating plate 4 can float up and down along the axis of the conical cylinder 3, so as to achieve a better effect of regulating the furnace pressure.
[0037] In the utility model, two radially symmetrical limit seats 10 are respectively provided on the outer walls of both sides of the discharge pipe 1, and both limit seats 10 are provided with through holes (not shown in the figure).
[0038] In the utility model, the extended ends of the two supporting cross bars 9 are respectively connected with the vertical bars 11 in one piece, the lower ends of the two vertical bars 11 respectively pass through the two through holes and extend out, and the lower ends of the two vertical bars 11 are provided with threaded sections and screwed with locking nuts 12.
[0039] Therefore, by tightening the locking nut 12 , the locking nut 12 is abutted against the upper surface of the corresponding limiting seat 10 , and the limiting seat 10 provides auxiliary support for the supporting cross bar 9 .
[0040] By loosening and rotating the locking nut 12 upward, the two vertical rods 11 can be moved up and down, thereby driving the two supporting cross bars 9 to move up and down, thereby driving the floating plate 4 to move up and down, and adjusting the height of the floating plate 4 to meet the furnace pressure required to be maintained in the nitriding furnace.
[0041] The utility model is further described below in conjunction with the accompanying drawings:
[0042] Before the piston ring is nitrided, the height of the floating plate 4 is adjusted according to the furnace pressure required to be maintained in the nitriding furnace.
[0043] During the nitriding process of the piston ring, when the internal air pressure of the nitriding furnace is relatively low, the floating plate 4 naturally drops to the lowest point along the guide vertical rod 7 under the action of gravity. At this time, the outer edge of the floating plate 4 abuts against the inner wall of the conical cylinder 3, sealing the conical cylinder 3, thereby ensuring that the furnace pressure of the nitriding furnace is maintained in a stable state.
[0044] When the internal gas pressure of the nitriding furnace is relatively high, the floating plate 4 is lifted along the guide vertical rod 7 by the top pressure of the gas pressure. At this time, a pressure relief channel 5 is formed between the outer edge of the floating plate 4 and the inner wall of the conical cylinder 3. The gas is discharged through the pressure relief channel 5, which can reduce the furnace pressure of the nitriding furnace.
[0045] When the furnace pressure of the nitriding furnace returns to a stable state, the gas pressure in the discharge pipe 1 is insufficient to support the lifted floating plate 4. Under the action of gravity, the floating plate 4 naturally drops to the lowest point along the guide vertical rod 7 again. At this time, the outer edge of the floating plate 4 abuts against the inner wall of the conical cylinder 3, and the conical cylinder 3 is sealed again, so that the furnace pressure of the nitriding furnace returns to a stable state.
[0046] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
[0047] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent changes made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.
Claims
1. A furnace pressure automatic regulating device for a nitriding furnace, comprising a discharge pipe fixedly connected to an exhaust gas discharge port of the nitriding furnace, characterized in that: The top end of the discharge pipe is fixedly connected with a conical cylinder which is communicated with the discharge pipe and is larger at the top and smaller at the bottom. A floating plate is installed inside the conical cylinder through a supporting mechanism. The floating plate can float up and down with the change of the air pressure in the discharge pipe. When the floating plate naturally drops to the lowest point, the outer edge of the floating plate abuts against the inner wall of the conical cylinder to seal the conical cylinder and maintain the furnace pressure of the nitriding furnace. When the floating plate is lifted by the top pressure of the air pressure, a pressure relief channel is formed between the outer edge of the floating plate and the inner wall of the conical cylinder to reduce the furnace pressure of the nitriding furnace.
2. The automatic furnace pressure regulating device of a nitriding furnace according to claim 1, characterized in that: Two radially symmetrical U-shaped grooves are respectively provided on both sides of the upper port of the conical cylinder.
3. The automatic furnace pressure regulating device of a nitriding furnace according to claim 2, characterized in that: The supporting mechanism includes a connecting tube, a guide vertical rod, a stop block and two supporting cross rods. The upper end of the guide vertical rod is fixedly connected to the connecting tube, and the stop block is fixedly connected to the bottom end of the guide vertical rod; the two supporting cross rods are radially symmetrically arranged, one end of the two supporting cross rods is respectively fixedly connected to the two sides of the connecting tube, and the other ends of the two supporting cross rods respectively pass through the two U-shaped grooves and extend out, and the other ends of the two supporting cross rods respectively abut against the bottom surfaces of the two U-shaped grooves.
4. The automatic furnace pressure regulating device of a nitriding furnace according to claim 3, characterized in that: The floating plate is slidably sleeved on the guide vertical rod, and floats up and down along the guide vertical rod between the connecting tube and the stop block.
5. The automatic furnace pressure regulating device of a nitriding furnace according to claim 4, characterized in that: The floating plate is a concave plate with a low middle part and high surrounding parts.
6. The automatic furnace pressure regulating device of a nitriding furnace according to claim 3, characterized in that: An inner wall of the connecting tube is provided with an internal thread, and an upper end of the guide vertical rod is provided with an external thread and is screwed into the connecting tube.
7. The automatic furnace pressure regulating device of a nitriding furnace according to claim 3, characterized in that: The discharge pipe, the conical cylinder, the floating plate, the connecting cylinder and the guide vertical rod are coaxially arranged.
8. The automatic furnace pressure regulating device of a nitriding furnace according to claim 3, characterized in that: Two radially symmetrical limiting seats are respectively provided on the outer walls of both sides of the discharge pipe, and through holes are provided on the two limiting seats.
9. The automatic furnace pressure regulating device of a nitriding furnace according to claim 8, characterized in that: The extended ends of the two supporting cross bars are respectively connected with vertical bars in one piece, and the lower ends of the two vertical bars respectively pass through the two through holes and extend out, and the lower ends of the two vertical bars are provided with threaded sections and screwed with locking nuts. The locking nuts are tightened and abut against the upper surface of the corresponding limit seats.