Pressure reducing valve structure capable of achieving stable adjustment in pressure adjustment
By connecting the guide rod at the bottom end of the adjustment column of the pressure reducing valve, the diaphragm and the spring are prevented from moving sideways when moving up and down, the problem of affecting the adjustment accuracy of the pressure reducing valve is solved, and the stability of the vehicle operating conditions and effective control of the pressure difference is achieved.
Patent Information
- Application Number
- CN202421858728.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-02
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-08-02
AI Technical Summary
During the use of existing pressure reducing valves, the diaphragm and spring will undergo slight sideways during the up and down movement, which will affect the adjustment accuracy, especially when the vehicle is used, which will affect the stability of the working conditions.
A pressure reducing valve structure that achieves stable adjustment in pressure adjustment is designed. By connecting the guide rod at the bottom end of the adjustment column, the bottom end of the guide rod is inserted into the safety valve seat, and the guide of the guide rod is used to prevent the spring and the diaphragm from moving sideways when up and down.
The precision of pressure reducing valve adjustment is achieved to ensure more stable use of the vehicle operating conditions. The pressure difference between the engine and idle state at 2000r is less than 0.01Mpa.
Smart Images
Figure CN222963406U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pressure reducing valves, and specifically relates to a pressure reducing valve structure that realizes stable regulation during pressure regulation. Background Art
[0002] A pressure reducing valve is a valve that reduces the inlet pressure to a required outlet pressure through adjustment and relies on the energy of the medium itself to automatically maintain the stability of the outlet pressure. From the perspective of fluid mechanics, a pressure reducing valve is a throttling element with variable local resistance, that is, by changing the throttling area, the flow velocity and the kinetic energy of the fluid are changed, resulting in different pressure losses, so as to achieve the purpose of pressure reduction. Then, relying on the adjustment of the control and regulation system, the fluctuation of the pressure behind the valve is balanced with the spring force, so that the pressure behind the valve remains constant within a certain error range.
[0003] The pressure regulation range of a pressure reducing valve refers to the adjustable range of the output pressure P2 of the pressure reducing valve, and within this range, the specified accuracy is required to be achieved. The pressure regulation range is mainly related to the stiffness of the pressure regulating spring. The pressure characteristic of a pressure reducing valve refers to the characteristic that when the flow rate g is a fixed value, the output pressure fluctuates due to the fluctuation of the input pressure. The smaller the output pressure fluctuation, the better the characteristic of the pressure reducing valve. The output pressure must be lower than the input pressure by a certain value to basically not change with the change of the input pressure. The flow characteristic of a pressure reducing valve refers to the characteristic that when the input pressure is constant, the output pressure changes with the change of the output flow rate g. When the flow rate g changes, the smaller the change of the output pressure, the better. Generally, the lower the output pressure, the smaller the fluctuation of its change with the output flow rate.
[0004] At present, the technology of pressure reducing valves is becoming mature, but in actual use, the diaphragm and the spring will have a slight lateral displacement phenomenon during the up and down movement, and this movement will affect the adjustment accuracy of the pressure reducing valve. Summary of the Utility Model
[0005] The purpose of the utility model is to overcome the problems proposed in the above background art, and provides a pressure reducing valve structure that realizes stable regulation during pressure regulation. This structure can achieve stable operation, prevent the diaphragm and the spring from having a slight lateral displacement during the up and down movement, and ensure the adjustment accuracy of the pressure reducing valve.
[0006] The purpose of the utility model is mainly achieved through the following technical solutions:
[0007] A pressure reducing valve structure that achieves stable regulation in pressure regulation, including a mounting cover that is hollow inside and open at both ends. A regulating column is arranged in the cavity of the mounting cover, and the top end of the regulating column is inserted into the top opening of the mounting cover. A spring is sleeved on the outer wall of the regulating column, and the spring is located in the mounting cover. An safety valve seat is arranged in the mounting cover. The bottom end of the regulating column is connected with a guide rod, and the bottom end of the guide rod is inserted into the safety valve seat. Currently, the technology of pressure reducing valves is becoming mature. However, in actual use, due to the lack of restriction on the frequent linear motion, the diaphragm and the spring will have a slight lateral shift during the up and down movement. This lateral shift will affect the adjustment accuracy of the pressure reducing valve. Especially after being installed on a vehicle, it will affect the stability of the vehicle working conditions. There is an obvious pressure difference between the normal working condition and the idle state of the engine. To solve the above problems, this solution designs a pressure reducing valve structure that achieves stable regulation in pressure regulation. By connecting a guide rod to the bottom end of the regulating column and inserting the bottom end of the guide rod into the safety valve seat, through the guidance of the guide rod, the spring and the diaphragm can move up and down without lateral shift, ensuring the adjustment accuracy of the pressure reducing valve and making the vehicle working conditions more stable. When the engine is at 2000r, the pressure difference from the idle state is less than 0.01Mpa.
[0008] Furthermore, it also includes a hollow shell. The mounting cover is arranged above the shell. A diaphragm support is arranged in the cavity of the shell. The diaphragm support is connected with the safety valve seat. A diaphragm is arranged on the diaphragm support, and the side wall of the diaphragm is connected with the cavity wall. A lever is arranged in the cavity of the shell. The bottom end of the safety valve seat passes through the diaphragm and is connected with the lever. The lever is connected with the inner wall of the shell and can rotate around the connection point. By rotating the regulating column, the diaphragm moves downward, driving the diaphragm support and the lever to move downward. Since the lever can rotate around the connection point, there is no block during its downward movement, and the entire adjustment and action process can be realized, achieving multi-stage adjustment and precise pressure adjustment. The rotation of the regulating column is used to achieve the change in depth. There is a thread on the outer wall of the regulating column, and it is screwed into the opening at the top of the mounting cover to form self-locking. When the regulating column is rotated, the self-locking still exists, and the change in the depth of the regulating column in the mounting cover drives the components below it to move, realizing the adjustment process.
[0009] Furthermore, a safety valve is arranged in the safety valve seat. The safety valve is connected with the diaphragm. A pull rod is connected to the bottom of the safety valve, and the pull rod is connected with the lever. A through hole is arranged at the top of the safety valve seat. The guide rod passes through the through hole and can contact the top of the safety valve, and the guide rod can move along the axis direction in the through hole. A groove is formed at the top of the safety valve. After the guide rod passes through the through hole, the bottom end is inserted into the groove to form positioning. When the regulating column is rotated, the depth of the regulating column changes, and the guide rod presses against the positioning sleeve and moves downward. Due to the thread action, the regulating column realizes self-locking and will not loosen.
[0010] Further, the top end of the spring contacts the top of the inner cavity of the mounting cover, and the bottom end contacts the safety valve seat. With this structure, the two ends of the spring are limited and positioned, so that the spring moves along the same trajectory during compression and extension, without causing deviation, ensuring the accuracy of adjustment.
[0011] In summary, compared with the prior art, the present utility model has the following beneficial effects: in this solution, a guide rod is connected to the bottom end of the adjusting column, and the bottom end of the guide rod is inserted into the safety valve seat. Through the guidance of the guide rod, the spring and the diaphragm can move up and down without lateral displacement, ensuring the accuracy of the pressure reducing valve adjustment, making the vehicle working condition more stable. When the engine is at 2000 r, the pressure difference from the idle state is less than 0.01 Mpa. Description of the Drawings
[0012] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, form a part of this application, and do not constitute a limitation to the embodiments of the present utility model. In the drawings:
[0013] Figure 1 is the front view of the present utility model.
[0014] Figure 2 is Figure 1 the sectional view of
[0015] The names corresponding to the reference numerals in the drawings are as follows:
[0016] 1 - adjusting column, 2 - adjusting disc, 3 - spring, 4 - safety valve seat, 5 - diaphragm, 6 - valve port, 7 - lever, 8 - housing, 9 - mounting cover, 10 - guide rod, 11 - diaphragm bracket. Detailed Embodiments
[0017] To make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below in conjunction with the embodiments and the drawings. The illustrative specific embodiments and descriptions thereof of the present utility model are only used to explain the present utility model and do not constitute a limitation to the present utility model.
[0018] As Figure 1 and Figure 2 shown, a pressure reducing valve structure for achieving stable adjustment in pressure adjustment in this embodiment uses a housing 8 with a hollow interior as the main structure, and an air inlet device and an air outlet pipe are respectively arranged on the side wall of the housing 8, and both the air inlet device and the air outlet pipe are communicated with the inner cavity of the housing 8. The requirements for air intake and air outlet are respectively realized through the air inlet device and the air outlet pipe. In order to prevent impurities in the incoming gas, a filter can be provided. The air inlet device includes a filter, the filter is communicated with the inner cavity of the housing through a pipeline, and an air inlet joint is arranged on the side wall of the filter. The impurities are filtered through the filter to prevent clogging inside the pressure reducing valve.
[0019] An installation cover 9 with a hollow interior and open ends is provided above the housing 8. An adjustment column 1 is arranged in the cavity of the installation cover 9, and the top end of the adjustment column 1 is inserted into the top opening of the installation cover 9. A spring 3 is sleeved on the outer wall of the adjustment column 1, and the spring 3 is located in the installation cover 9. A safety valve seat 4 is arranged in the installation cover 9. The bottom end of the adjustment column 1 is connected with a guide rod 10, and the bottom end of the guide rod 10 is inserted into the safety valve seat 4. A through hole is arranged at the top of the safety valve seat 4, and the guide rod 10 can pass through the through hole and contact the top of the safety valve, and the guide rod 10 can move along the axial direction in the through hole. A diaphragm support 11 is arranged in the cavity of the housing 8, and the diaphragm support 11 is connected with the safety valve seat 4. A diaphragm 5 is arranged on the diaphragm support 11, and the side wall of the diaphragm 5 is connected with the cavity wall. A lever 7 is arranged in the cavity of the housing 8. The bottom end of the safety valve seat 4 passes through the diaphragm 5 and is connected with the lever 7. The lever 7 is connected with the inner wall of the housing 8 and can rotate around the connection point. A safety valve is arranged in the safety valve seat 4, the safety valve is connected with the diaphragm 5, and a pull rod is connected to the bottom of the safety valve and the pull rod is connected with the lever 7. By rotating the adjustment column 1, the diaphragm 5 moves downward, moving the diaphragm support 11 and the lever 7 downward. Since the lever 7 can rotate around the connection point and there is no block during its downward movement, the entire adjustment and operation process can be achieved, realizing multi-stage adjustment and precise pressure adjustment. The rotation of the adjustment column 1 is used to realize the depth change. The outer wall of the adjustment column 1 has threads, which are screwed into the opening at the top of the installation cover 9 to form self-locking. When the adjustment column 1 is rotated, the self-locking still exists, and the depth change of the adjustment column 1 in the installation cover drives the components below it to move, realizing the adjustment process.
[0020] The top end of the spring 3 contacts the top of the inner cavity of the installation cover 9, and the bottom end contacts the safety valve seat 4. In this way, the two ends of the spring 3 are limited and positioned, so that the spring 3 moves along the same track during compression and extension, without causing deviation, ensuring the adjustment accuracy.
[0021] The working principle of the pressure reducer in the non-intake state: Under the action of the prestress of the spring 3, the diaphragm 5 moves one end of the secondary lever downward, so that there is a certain gap between the lever 7 in the lever group and the valve port 6 on the valve body, making the valve port 6 in an open state.
[0022] Intake and working state: When 1.2 Mpa natural gas enters the pressure reduction chamber through the valve port 6 on the valve body, the first-stage diaphragm gradually moves upward. When the air pressure in the first-stage pressure reduction chamber reaches a certain value and the thrust of the diaphragm 5 completely overcomes the pre-tightening force of the spring 3, the resultant moment acting on the lever 7 causes the lever to close the valve port. The gas flow rate changes with the engine load. Under the interaction of the spring 3 and the diaphragm 5, the opening degree of the valve port 6 changes at any time to ensure that the output pressure is stable at 0.1 Mpa, completing the pressure reduction. To meet the vehicle conditions and make the output pressure adjustable, the adjusting column 1 and the adjusting disc 2 are provided. When the adjusting column 1 rotates clockwise, the pressure of the spring 3 increases, and the diaphragm 5 and the lever 7 reach a new dynamic balance, and the output pressure increases (adjustable range of 0.1 - 0.2 MPa) to meet the gas flow rate required for various working conditions of the engine.
[0023] Back pressure chamber of the pressure reducer: The atmospheric through-hole of the back pressure chamber is on the upper cover of the first-stage pressure reducer; to ensure the normal operation of the pressure reducer, the atmospheric through-hole of the back pressure chamber must be kept unobstructed.
[0024] Abnormal working state: In the abnormal working state, the spring in the safety valve seat 4 is overcome by the abnormal pressure, the spring moves upward, and the abnormal pressure is discharged, playing the role of a safety valve.
[0025] In this solution, by setting a guide rod 10 between the adjusting column 1 and the safety valve seat 4, the spring 3 and the diaphragm 5 can move up and down without lateral displacement, making the vehicle working conditions more stable. When the engine is at 2000 r, the pressure difference from the idle state is less than 0.01 Mpa.
[0026] The above specific implementation manners further elaborate on the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are only the specific implementation manners of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. A pressure reducing valve structure for achieving stable regulation in pressure regulation, comprising a mounting cover (9) which is hollow inside and open at both ends, an adjusting column (1) is arranged in the cavity of the mounting cover (9), and the top end of the adjusting column (1) is inserted into the top opening of the mounting cover (9), and the outer wall of the adjusting column (1) is covered with a spring (3), and the spring (3) is located in the mounting cover (9), characterized in that: A safety valve seat (4) is arranged in the mounting cover (9), a guide rod (10) is connected to the bottom end of the regulating column (1), and the bottom end of the guide rod (10) is inserted into the safety valve seat (4).
2. The pressure reducing valve structure for achieving stable regulation in pressure regulation according to claim 1, characterized in that: It also includes an internally hollow shell (8), the mounting cover (9) being arranged above the shell (8), a diaphragm bracket (11) being arranged in the cavity of the shell (8), the diaphragm bracket (11) being connected to the safety valve seat (4), a diaphragm (5) being arranged on the diaphragm bracket (11), and a side wall of the diaphragm (5) being connected to a wall surface of the cavity, a lever (7) being arranged in the cavity of the shell (8), the bottom end of the safety valve seat (4) passing through the diaphragm (5) being connected to the lever (7), and the lever (7) being connected to the inner wall of the shell (8) and being capable of rotating around the connection.
3. The pressure reducing valve structure for achieving stable regulation in pressure regulation according to claim 2, characterized in that: A safety valve is arranged in the safety valve seat (4), the safety valve is connected to the diaphragm (5), a pull rod is connected to the bottom of the safety valve, and the pull rod is connected to the lever (7).
4. The pressure reducing valve structure for achieving stable regulation in pressure regulation according to claim 3, characterized in that: The top of the safety valve seat (4) is provided with a through hole, the guide rod (10) passes through the through hole and can contact the top of the safety valve, and the guide rod (10) can move in the through hole along the axial direction.
5. The pressure reducing valve structure for achieving stable regulation in pressure regulation according to claim 1, characterized in that: The top end of the spring (3) contacts the top of the inner cavity of the mounting cover (9), and the bottom end contacts the safety valve seat (4).