Backpressure regulating valve suitable for generator sealing oil system
By introducing a liquid flow channel and a diaphragm structure into the back pressure regulating valve, increasing the contact area between the oil and the valve core and the diaphragm, the problem of difficult to trigger the pressure relief operation in the prior art is solved, and a more sensitive pressure relief operation and a more stable system pressure are achieved.
Patent Information
- Application Number
- CN202411902584.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-04-11
AI Technical Summary
In the case where the contact area between the oil and the valve core is insufficient, it is difficult for the existing back pressure regulating valve to effectively trigger the pressure relief operation when the oil and hydraulic pressure strength changes slightly, resulting in unstable system pressure.
By introducing a liquid flow channel and a diaphragm structure into the back pressure regulating valve, the oil can not only apply thrust to the valve core, but also apply force to the oil located in the sub-cavity through the diaphragm, increasing the oil contact area, thereby reducing the minimum critical value of oil and hydraulic pressure required to trigger the pressure relief operation.
It realizes the pressure relief operation more sensitively under lower oil and hydraulic pressure strength, improves the system pressure stability ability and reduces the oil and hydraulic pressure threshold required for pressure relief operation.
Smart Images
Figure CN119802294A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of back pressure regulating valves, and in particular to a back pressure regulating valve suitable for a generator sealing oil system. Background Art
[0002] The generator sealing oil system is a system designed specifically for generators. Its main function is to prevent the leakage of fluid inside the generator and to prevent external air and moisture from entering the generator. Usually, a back pressure regulating valve is installed in the generator sealing oil system. The back pressure regulating valve can not only maintain the stability of the system pressure, but also prevent the oil from flowing back or backflowing and protect the system from damage. It helps improve the efficiency of the system and protect the system from the influence of back pressure by controlling the back pressure in the sealing oil system. Specifically, the principle of the back pressure regulating valve is: when the back pressure in the system exceeds a certain limit, the back pressure regulating valve will automatically open to discharge excess sealing oil to relieve pressure and keep the system pressure stable; and when the back pressure returns to the normal range, the back pressure regulating valve will automatically close to ensure the normal operation of the system.
[0003] Existing back pressure regulating valves usually include a valve body, which includes an internal fluid channel for oil to pass through. A valve core is provided in the fluid channel, and the valve core is usually connected to a spring. When the back pressure in the system exceeds a certain value, the thrust of the oil on the valve core overcomes the elastic force of the spring, so that the valve core moves to open the fluid channel. When the back pressure in the system returns to normal, the spring resets the valve core to close the fluid channel. Sometimes users hope that the contact area between the oil and the valve core can be larger so that the back pressure regulating valve can be triggered to release pressure more sensitively. For the valve core to move, the thrust applied to the valve core needs to overcome the elastic force of the spring. Since the thrust on the valve core is equal to the oil pressure multiplied by the oil contact area, the oil pressure is inversely proportional to the contact area. In the prior art, based on design requirements such as preventing the valve core from being too heavy, the overall structure of the valve core will not be too large, and the contact area between the valve core and the oil will not be too large. Therefore, to push the valve core to move, the oil pressure needs to reach a higher value to meet the requirements. If the oil pressure only changes slightly, the valve core is difficult to be pushed. Summary of the invention
[0004] In order to make the oil contact area larger so that the pressure relief action is triggered more sensitively, the present application provides a back pressure regulating valve suitable for a generator sealing oil system.
[0005] The back pressure regulating valve for the generator sealing oil system provided in this application adopts the following technical solution: A back pressure regulating valve suitable for a generator sealing oil system comprises a valve body, wherein a liquid inlet channel, a mounting channel and a liquid outlet channel are formed in the valve body, wherein the liquid inlet channel, the mounting channel and the liquid outlet channel are sequentially connected; a sleeve is mounted on the inner wall of the mounting channel, a valve core is mounted on the sleeve, and the valve core is configured to be able to slide to open / close the mounting channel; The valve body is also provided with an installation cavity, in which a diaphragm with elastic deformation capability is provided, the diaphragm divides the installation cavity into sub-cavity one and sub-cavity two, the diaphragm is connected to the valve core and the diaphragm is subjected to a force in the direction of sub-cavity two, which will drive the valve core to slide to open the installation channel; the valve body is also provided with a liquid flow channel, the sub-cavity one is connected with the liquid inlet channel through the liquid flow channel, and the oil entering the liquid inlet channel will enter the sub-cavity one through the liquid flow channel and exert a force in the direction of sub-cavity two on the diaphragm.
[0006] By adopting the above technical solution, the following actions can be achieved: the oil entering the liquid inlet channel will also enter the sub-chamber one through the liquid flow channel. When the system back pressure exceeds a certain value, the oil in the liquid inlet channel will apply thrust to the valve core, and at the same time, the oil in the sub-chamber two will apply force in the direction of the sub-chamber two to the diaphragm, and the diaphragm will drive the valve core to move. At this time, the oil contact area includes the part where the valve core contacts the oil in the liquid inlet channel on the one hand, and the part where the oil in the sub-chamber two contacts the diaphragm and the valve core on the other hand. The above two forces will cooperate to drive the valve core to move in the direction of the sub-chamber two so that the installation channel is opened. The opened installation channel will enable the liquid inlet channel and the liquid outlet channel to be connected, thereby triggering the pressure relief action. The present application reduces the minimum critical value of the oil pressure required to trigger the pressure relief action.
[0007] Preferably, a spring is provided in the second sub-chamber, a mounting hole is provided on the valve body, an adjusting member is installed in the mounting hole, one end of the spring is connected to the valve core, and the other end is connected to the adjusting member, and the adjusting member is configured to be rotatable to adjust the compression force of the spring.
[0008] By adopting the above technical solution, the compression amount of the spring can be adjusted by rotating the adjusting member, thereby adjusting the compression force of the spring. The change of the elastic compression force leads to a change in the critical value of the thrust required for the valve core to move.
[0009] Preferably, the adjusting member is an adjusting bolt, and the adjusting bolt is threadedly connected to the mounting hole.
[0010] Preferably, the valve core comprises a valve head, a sub-core 1 and a sub-core 2 which are connected in sequence, the valve head is connected to the diaphragm, the sub-core 1 is attached to the inner wall of the sleeve, and the sub-core 1 and the inner wall of the sleeve are in sliding connection; The sleeve is provided with a connecting port, a flow gap is provided between the sub-core 2 and the sleeve, the flow gap is connected with the connecting port, and a sealing member is provided on the sub-core 2; the sub-core 2 has a first position and a second position, when the sub-core 2 is located at the first position, the liquid inlet channel is connected with the liquid outlet channel through the flow gap and the connecting port, and when the sub-core 2 is located at the second position, the sealing member contacts the sleeve to close the flow gap.
[0011] By adopting the above technical solution, when the back pressure in the system exceeds a certain value, sub-core 2 moves to the first position, and the liquid inlet channel is connected with the liquid outlet channel through the flow gap and the connecting port, and the oil in the liquid inlet channel will pass through the flow gap and the connecting port and enter the liquid outlet channel to relieve pressure; when the back pressure in the system returns to normal, sub-core 2 moves to the second position, and the sealing contact sleeve closes the flow gap.
[0012] Preferably, the sleeve comprises a raised portion on the inner wall, and the raised portion is in line contact with the sealing member.
[0013] By adopting the above technical solution, the sealing member forming the line seal in the present application has better sealing performance.
[0014] Preferably, the end of the sub-core 2 away from the sub-core 1 has a buffer column, the liquid inlet channel has a receiving blind hole, the bottom of the receiving blind hole is provided with a buffer pad, and the buffer column is configured to be able to move and contact the buffer pad to be buffered.
[0015] By adopting the above technical solution, when the second sub-core moves from the first position to the second position, the buffer column will be inserted into the receiving blind hole and contact the buffer pad so that the second sub-core is buffered.
[0016] Preferably, the valve head, sub-core one, sub-core two and buffer column are an integrated part.
[0017] By adopting the above technical solution, the integrated valve head, sub-core one, sub-core two and buffer column have better structural strength and improved service life.
[0018] Preferably, the valve body comprises a valve seat and a valve cover, and the diaphragm is squeezed and fixed by the valve seat and the valve cover; the valve seat and the valve cover are detachably connected.
[0019] By adopting the above technical solution, the valve cover can be removed from the valve seat and thus the diaphragm can be removed, and at this time, the diaphragm and the inside of the valve seat and the valve cover can be easily cleaned.
[0020] Preferably, a docking hole 1 is formed on the valve seat, a docking hole 2 is formed on the valve cover, and the docking hole 1 and the docking hole 2 are connected together by a fastener.
[0021] By adopting the above technical solution, the valve cover and the valve seat can be separated by removing the fasteners.
[0022] In summary, the present invention includes at least one of the following beneficial technical effects: 1. The present application can achieve the following actions: the oil entering the inlet channel will also enter the sub-chamber one through the liquid flow channel. When the system back pressure exceeds a certain value, the oil in the inlet channel will exert a thrust on the valve core, and at the same time, the oil in the sub-chamber two will exert a force on the diaphragm in the direction of the sub-chamber two, and the diaphragm will drive the valve core to move. At this time, the oil contact area includes the part where the valve core contacts the oil in the inlet channel on the one hand, and the part where the oil in the sub-chamber two contacts the diaphragm and the valve core on the other hand. The above two forces will cooperate to drive the valve core to move in the direction of the sub-chamber two, so that the installation channel is opened. The opened installation channel will enable the inlet channel and the outlet channel to be connected, thereby triggering the pressure relief action. The present application reduces the minimum critical value of the oil pressure required to trigger the pressure relief action; 2. Rotating the adjusting piece can adjust the compression amount of the spring and thus adjust the compression force of the spring. The change of the elastic compression force will cause the change of the critical value of the thrust required for the valve core to move; 3. The user can remove the valve cover from the valve seat to remove the diaphragm, which makes it easy to clean the diaphragm and the inside of the valve seat and valve cover. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 is a cross-sectional view of a back pressure regulating valve suitable for a generator sealing oil system in an embodiment of the present application; Figure 2 yes Figure 1 Enlarged view of part A.
[0024] Markings in the accompanying drawings: 1. valve body; 11. liquid inlet channel; 12. installation channel; 13. liquid outlet channel; 14. installation chamber; 141. sub-chamber one; 142. sub-chamber two; 15. liquid flow channel; 16. receiving blind hole; 17. valve seat; 171. docking hole one; 18. valve cover; 181. docking hole two; 2. sleeve; 21. connecting port; 22. flow gap; 23. raised portion; 3. valve core; 31. valve head; 32. sub-core one; 33. sub-core two; 4. diaphragm; 5. spring; 51. adjusting member; 6. sealing member; 7. buffer column; 71. buffer pad. DETAILED DESCRIPTION
[0025] The present invention is further described in detail below in conjunction with the accompanying drawings.
[0026] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0027] The embodiment of the present application discloses a back pressure regulating valve suitable for a generator sealing oil system, which is used to increase the oil contact area so as to make the triggering of the pressure relief action more sensitive.
[0028] Reference Figure 1 A back pressure regulating valve suitable for a generator sealing oil system comprises a valve body 1, in which a liquid inlet channel 11, an installation channel 12 and a liquid outlet channel 13 are opened, the liquid inlet channel 11, the installation channel 12 and the liquid outlet channel 13 are arranged in sequence from right to left, the liquid inlet channel 11, the installation channel 12 and the liquid outlet channel 13 are connected in sequence, the liquid inlet channel 11 and the liquid outlet channel 13 are arranged horizontally, and the installation channel 12 is arranged vertically, the liquid inlet channel 11 is connected with the system oil, and the pressure in the liquid inlet channel 11 is the liquid pressure in the system; a sleeve 2 is installed on the inner wall of the installation channel 12, and a valve core 3 is installed on the sleeve 2, and the valve core 3 can slide up and down to open / close the installation channel 12.
[0029] Reference Figure 1 , the valve body 1 is also provided with an installation cavity 14, the installation cavity 14 is located above the installation channel 12 and the installation cavity 14 is connected with the installation channel 12, a diaphragm 4 with elastic deformation ability is provided in the installation cavity 14, the material of the diaphragm 4 is rubber, the diaphragm 4 divides the installation cavity 14 into a sub-cavity 1 141 and a sub-cavity 2 142, the sub-cavity 1 141 is located below the sub-cavity 2 142, the diaphragm 4 is connected with the valve core 3 and the diaphragm 4 is subjected to an upward force which will drive the valve core 3 to slide to open the installation channel 12 so that the liquid inlet channel 11 is connected with the liquid outlet channel 13 through the installation channel 12; the valve body 1 is also provided with a liquid flow channel 15, the liquid flow channel 15 is vertically arranged, the liquid flow channel 15 is located on the right side of the installation channel 12, the sub-cavity 1 141 is connected with the liquid inlet channel 11 through the liquid flow channel 15, and the oil entering the liquid inlet channel 11 will enter the sub-cavity 1 141 through the liquid flow channel 15 to exert an upward force on the diaphragm 4. A spring 5 is arranged in the second sub-chamber 142 . A through mounting hole is opened at the top of the valve body 1 . An adjusting member 51 is installed in the mounting hole. One end of the spring 5 is connected to the valve core 3 , and the other end is connected to the adjusting member 51 .
[0030] When the system back pressure exceeds a certain value, that is, the oil pressure in the liquid inlet channel 11 is too high, this application can be opened to release pressure to ensure the stability of the system pressure. When the system back pressure is normal, this application will be closed and not work.
[0031] Specifically, the pressure relief action is as follows: the oil entering the inlet channel 11 will also enter the sub-chamber 1 141 through the liquid flow channel 15. When the system back pressure exceeds a certain value, the oil in the inlet channel 11 will exert an upward thrust on the valve core 3, and at the same time, the oil in the sub-chamber 2 142 will exert an upward force on the diaphragm 4, and the diaphragm 4 will also drive the valve core 3 to move upward. At this time, the oil contact area includes the part where the valve core 3 contacts the oil in the inlet channel 11 on the one hand, and the part where the oil in the sub-chamber 2 142 contacts the diaphragm 4 and the valve core 3 on the other hand. The above two forces will cooperate to drive the valve core 3 to move toward the sub-chamber 2 142 at the same time, so that the installation channel 12 is opened. The opened installation channel 12 will enable the inlet channel 11 and the outlet channel 13 to be connected, thereby triggering the pressure relief action. After the pressure relief is completed, under the action of the elastic deformation capacity of the diaphragm 4 and the action of the spring 5, the valve core 3 will move downward and re-close the installation channel 12 to maintain the stability of the system pressure.
[0032] This application reduces the minimum critical value of the oil pressure required to trigger the pressure relief action; refer to Figure 1 In addition, in order to adjust the critical value of the thrust required for the valve core 3 to move, the adjusting member 51 can be rotated to adjust the compression force of the spring 5. Specifically, in the present application, the adjusting member 51 is an adjusting bolt, which is threadedly connected to the mounting hole. Rotating the adjusting member 51 can adjust the compression amount of the spring 5 and thus adjust the compression force of the spring 5.
[0033] Reference Figure 1 The valve core 3 includes a valve head 31, a sub-core 1 32 and a sub-core 2 33 which are connected in sequence. The valve head 31, the sub-core 1 32 and the sub-core 2 33 are arranged in sequence from top to bottom. The valve head 31 is fixedly connected to the diaphragm 4. The sub-core 1 32 is attached to the inner wall of the sleeve 2 and the sub-core 1 32 and the inner wall of the sleeve 2 are slidably connected, so the up and down movement of the sub-core 1 32 can be guided.
[0034] Reference Figure 1 and Figure 2 The sleeve 2 has a connecting port 21, a flow gap 22 is provided between the sub-core 2 33 and the sleeve 2, the flow gap 22 is connected to the connecting port 21, and a sealing member 6 is provided on the sub-core 2 33. The sealing member 6 is a sealing ring made of rubber in the embodiment of the present application.
[0035] Reference Figure 1 and Figure 2, the sub-core 2 33 has a higher first position and a lower second position; when the sub-core 2 33 is in the first position, the liquid inlet channel 11 is connected with the liquid outlet channel 13 through the flow gap 22 and the connecting port 21. At this time, the oil in the liquid inlet channel 11 will pass through the flow gap 22 and the connecting port 21 and enter the liquid outlet channel 13 to relieve pressure; when the sub-core 2 33 is in the second position, the seal 6 contacts the sleeve 2 to close the flow gap 22.
[0036] Reference Figure 2 Specifically, the sleeve 2 includes a protrusion 23 on the inner wall, and the protrusion 23 is in line contact with the seal 6. In the present application, the seal 6 forming a line seal has good sealing performance and a certain buffering capacity.
[0037] Reference Figure 1 In order to better cushion the sub-core 2 33, the end of the sub-core 2 33 away from the sub-core 1 32 has a buffer column 7, the liquid inlet channel 11 is opened with a receiving blind hole 16, and the bottom of the receiving blind hole 16 is provided with a buffer pad 71 made of rubber material, and the buffer column 7 is configured to be able to move downward and contact the buffer pad 71 to be cushioned.
[0038] Reference Figure 1 In order to improve the service life and movement reliability of the valve core 3, the valve head 31, the sub-core 1 32, the sub-core 2 33 and the buffer column 7 are integrated.
[0039] Reference Figure 1 In order to facilitate the unblocking and cleaning of the inside of the diaphragm 4, the valve seat 17 and the valve cover 18, the valve body 1 includes a valve seat 17 and a valve cover 18, and the diaphragm 4 is squeezed and fixed by the valve seat 17 and the valve cover 18; the valve seat 17 and the valve cover 18 are detachably connected. Specifically, a docking hole 171 is opened on the valve seat 17, and a docking hole 2 181 is opened on the valve cover 18. The docking hole 171 and the docking hole 2 181 are connected together by a fastener, and the fastener is preferably a bolt.
[0040] The implementation principle of a back pressure regulating valve suitable for a generator sealing oil system in the embodiment of the present application is as follows: When the system back pressure exceeds a certain value, that is, the oil pressure in the liquid inlet channel 11 is too high, since the oil entering the liquid inlet channel 11 will also enter the sub-chamber 1 141 through the liquid flow channel 15, the oil in the liquid inlet channel 11 will exert an upward thrust on the valve core 3. At the same time, the oil in the sub-chamber 2 142 will also exert an upward force on the diaphragm 4, and the diaphragm 4 will drive the valve core 3 to move upward. At this time, the oil contact area includes, on the one hand, the part where the valve core 3 contacts the oil in the liquid inlet channel 11, and on the other hand, it also includes the part where the oil in the sub-chamber 2 142 contacts the diaphragm 4 and the valve core 3. The above two forces will cooperate to drive the valve core 3 to move toward the sub-chamber 2 142, thereby opening the installation channel 12. The opened installation channel 12 will enable the liquid inlet channel 11 and the liquid outlet channel 13 to be connected, thereby triggering the pressure relief action.
[0041] After the pressure relief is completed, under the effect of the elastic deformation capacity of the diaphragm 4 and the effect of the spring 5, the valve core 3 will move downward to reclose the installation channel 12 to maintain the stability of the system pressure.
[0042] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.
Claims
1. A back pressure regulating valve suitable for a generator sealing oil system, characterized in that: The valve body (1) comprises a liquid inlet channel (11), a mounting channel (12) and a liquid outlet channel (13), wherein the liquid inlet channel (11), the mounting channel (12) and the liquid outlet channel (13) are sequentially connected; a sleeve (2) is mounted on the inner wall of the mounting channel (12), a valve core (3) is mounted on the sleeve (2), and the valve core (3) is configured to be able to slide to open / close the mounting channel (12); The valve body (1) is also provided with an installation cavity (14), and a diaphragm (4) with elastic deformation capability is provided in the installation cavity (14), and the diaphragm (4) divides the installation cavity (14) into a sub-cavity 1 (141) and a sub-cavity 2 (142), and the diaphragm (4) is connected to the valve core (3) and the diaphragm (4) is subjected to a force in the direction of the sub-cavity 2 (142) to drive the valve core (3) to slide to open the installation channel (12); the valve body (1) is also provided with a liquid flow channel (15), and the sub-cavity 1 (141) is connected to the liquid inlet channel (11) through the liquid flow channel (15), and the oil entering the liquid inlet channel (11) enters the sub-cavity 1 (141) through the liquid flow channel (15) to apply a force in the direction of the sub-cavity 2 (142) to the diaphragm (4).
2. A back pressure regulating valve suitable for a generator sealing oil system according to claim 1, characterized in that: A spring (5) is arranged in the second sub-chamber (142); a mounting hole is opened on the valve body (1); an adjusting member (51) is installed in the mounting hole; one end of the spring (5) is connected to the valve core (3), and the other end is connected to the adjusting member (51); the adjusting member (51) is configured to be rotatable to adjust the compression force of the spring (5).
3. A back pressure regulating valve suitable for a generator sealing oil system according to claim 2, characterized in that: The adjusting member (51) is an adjusting bolt, and the adjusting bolt is threadedly connected to the mounting hole.
4. A back pressure regulating valve suitable for a generator sealing oil system according to claim 1, characterized in that: The valve core (3) comprises a valve head (31), a sub-core (32) and a sub-core (33) which are connected in sequence, the valve head (31) is connected to the diaphragm (4), the sub-core (32) is attached to the inner wall of the sleeve (2), and the sub-core (32) and the inner wall of the sleeve (2) are in sliding connection; The sleeve (2) is provided with a connecting opening (21), a flow gap (22) is provided between the second sub-core (33) and the sleeve (2), the flow gap (22) is connected with the connecting opening (21), and a sealing member (6) is provided on the second sub-core (33); the second sub-core (33) has a first position and a second position, when the second sub-core (33) is located at the first position, the liquid inlet channel (11) is connected with the liquid outlet channel (13) through the flow gap (22) and the connecting opening (21), and when the second sub-core (33) is located at the second position, the sealing member (6) contacts the sleeve (2) to close the flow gap (22).
5. A back pressure regulating valve suitable for a generator sealing oil system according to claim 4, characterized in that: The sleeve (2) comprises a protrusion (23) on the inner wall, and the protrusion (23) is in line contact with the sealing member (6).
6. A back pressure regulating valve suitable for a generator sealing oil system according to claim 4, characterized in that: The second sub-core (33) has a buffer column (7) at one end away from the first sub-core (32); the liquid inlet channel (11) has a receiving blind hole (16); a buffer pad (71) is provided at the bottom of the receiving blind hole (16); and the buffer column (7) is configured to be able to move and then contact the buffer pad (71) to be buffered.
7. A back pressure regulating valve suitable for a generator sealing oil system according to claim 6, characterized in that: The valve head (31), sub-core one (32), sub-core two (33) and buffer column (7) are an integrated part.
8. The back pressure regulating valve suitable for a generator sealing oil system according to claim 1, characterized in that: The valve body (1) comprises a valve seat (17) and a valve cover (18); the diaphragm (4) is squeezed and fixed by the valve seat (17) and the valve cover (18); and the valve seat (17) and the valve cover (18) are detachably connected.
9. A back pressure regulating valve suitable for a generator sealing oil system according to claim 8, characterized in that: The valve seat (17) is provided with a docking hole 1 (171), the valve cover (18) is provided with a docking hole 2 (181), and the docking hole 1 (171) and the docking hole 2 (181) are connected together by a fastener.