Dual-pressure overflow valve
By designing a double-pressure relief valve, the combination of the valve core and elastic parts can achieve safe operation under low and high pressure conditions, avoiding the loss of the relief valve to the folding plate power, and solving the bending machine under different pressure conditions Impaired operation problem.
Patent Information
- Application Number
- CN202421205347.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-29
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-05-29
AI Technical Summary
During bending, the continuous back pressure generated by the overflow valve will lose the power of the folding plate and will be difficult to operate safely under low and high pressure conditions.
A double-pressure relief valve is designed to control the opening or closing of the first and second pressure oil ports through the movement of the valve core in the inner cavity of the valve body, and to ensure that the oil is overflowed and returned when the pressure rises. Oil, avoid continuous back pressure and ensure safe operation under low and high pressure conditions.
It effectively avoids the loss of the overflow valve to the folding plate power, ensures the safe operation of the bending machine under different pressure conditions, and prevents the occurrence of problems such as motor burning and oil temperature rise.
Smart Images
Figure CN222297068U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a double-pressure relief valve. Background Art
[0002] When bending thin plates, the bending machine uses the hydraulic cylinder as the power. The hydraulic pump drives the hydraulic cylinder to drive the slider to complete the bending work. Generally, the pressure in the oil circuit is adjusted by the overflow valve. The overflow valve generates back pressure to lock the slider, but continuous back pressure will consume the bending power. Utility Model Content
[0003] According to one aspect of the utility model, a dual-pressure relief valve is provided, comprising:
[0004] The valve body has an inner cavity, a first pressure oil port, a second pressure oil port and an oil return port, wherein the inner cavity is communicated with the first pressure oil port, the second pressure oil port and the oil return port respectively, and the first pressure oil port is communicated with the second pressure oil port;
[0005] The valve core can move in the inner cavity so that the first pressure oil port and the second pressure oil port can be opened or closed. The valve core is provided with an oil outlet, and the inner cavity is connected with the oil return port through the oil outlet.
[0006] The dual-pressure relief valve of the utility model controls the opening or closing of the first pressure oil port and the second pressure oil port by moving the valve core in the inner cavity of the valve body. When the pressure in the oil circuit is low, the valve core is tightly against the first pressure oil port, and the oil cannot enter the inner cavity through the first pressure oil port and the second pressure oil port; when the pressure in the oil circuit rises and exceeds the safety value, the overflowing oil enters the inner cavity through the first pressure oil port to drive the valve core to move in the direction close to the second pressure oil port, and then can trigger the opening of the second pressure oil port, so that the overflowing oil enters the inner cavity from the second pressure oil port, and the oil in the inner cavity returns through the oil outlet and the return oil port in turn. After the pressure is completely unloaded, the valve core is reset. In this way, the bending machine can be ensured to operate safely under two pressure levels: low pressure and high pressure within the safety range, and the continuous back pressure of the relief valve can be avoided to lose the folding power.
[0007] In some embodiments, a directional valve is installed at the second pressure oil port, and the valve core can move in the inner cavity to open or close the directional valve.
[0008] In some embodiments, a push piece is provided on one end of the valve core close to the directional valve, and the push piece is used to control the opening or closing of the directional valve.
[0009] In some embodiments, the second pressure oil port is located at the upper side of the valve body, the oil return port is located at the lower side of the valve body, and the first pressure oil port is located between the second pressure oil port and the oil return port.
[0010] In some embodiments, an elastic member is further included. When the valve core is squeezed by oil, the valve core moves upward, the elastic member deforms, and the first pressure oil port and the second pressure oil port are opened; when the valve core is not squeezed by oil, the elastic member restores its deformation, so that the valve core can move downward, and the first pressure oil port and the second pressure oil port are closed.
[0011] In some embodiments, the elastic member is a spring.
[0012] In some embodiments, the valve core has a sliding connection portion, which is used to slidely connect with the inner wall of the valve body in the inner cavity and divide the inner cavity into an upper cavity and a lower cavity. The upper cavity is connected to the oil return port through the oil outlet, and the first pressure oil port is connected to the lower cavity.
[0013] In some embodiments, the sliding connection portion is configured as a protrusion formed around the circumference of the valve core.
[0014] In some embodiments, a sealing ring is provided on one end of the valve core close to the oil return port to limit the first pressure oil port from being connected to the oil return port through the inner cavity.
[0015] In some embodiments, the first pressure oil port is communicated with the second pressure oil port through an overflow channel. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a cross-sectional view of the dual-pressure relief valve in the utility model when the first pressure oil port and the second pressure oil port are both closed;
[0017] Figure 2 It is a cross-sectional view of the dual-pressure relief valve of the utility model when the first pressure oil port and the second pressure oil port are both opened.
[0018] In the figure: 10, valve body; 11, first pressure oil port; 12, second pressure oil port; 13, oil return port; 14, valve core; 15, directional valve; 16, push-up member; 17, elastic member; 18, sliding connection; 19, upper cavity; 20, lower cavity; 21, sealing ring; 22, oil outlet. DETAILED DESCRIPTION
[0019] The utility model is further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of 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.
[0020] It should be noted that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0021] In the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0022] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0023] In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.
[0024] Please refer to Figure 1-2 The present embodiment provides a dual-pressure relief valve, including a valve body 10, a valve core 14 and an elastic member 17. The valve core 14 is moved in the valve body 10 to realize pressure unloading. The valve core 14 is reset under the action of the elastic member 17 after the pressure is completely unloaded, thereby ensuring that the bending machine can operate safely at two pressure levels, low pressure and high pressure within a safe range, and avoiding the continuous back pressure of the relief valve to lose the folding power.
[0025] The valve body 10 has an inner cavity, a first pressure oil port 11, a second pressure oil port 12 and an oil return port 13. The inner cavity is connected to the first pressure oil port 11, the second pressure oil port 12 and the oil return port 13 respectively. The first pressure oil port 11 is connected to the second pressure oil port 12. The valve core 14 can move in the inner cavity so that the first pressure oil port 11 and the second pressure oil port 12 can be opened or closed. The valve core 14 has an oil outlet 22. The inner cavity is connected to the oil return port 13 through the oil outlet 22. When the pressure in the oil circuit is low, please refer to Figure 1 , the valve core 14 is tightly against the first pressure oil port 11, and the oil cannot enter the inner cavity through the first pressure oil port 11 and the second pressure oil port 12; when the pressure in the oil circuit rises above the safety value, please refer to Figure 2 The overflowing oil enters the inner cavity through the first pressure oil port 11, driving the valve core 14 to move toward the second pressure oil port 12, thereby triggering the opening of the second pressure oil port 12, so that the overflowing oil enters the inner cavity from the second pressure oil port 12, and the oil in the inner cavity returns through the oil outlet 22 and the oil return port 13 in turn. After the pressure is completely released, the valve core 14 is reset. This ensures that the bending machine can work safely under two-level pressure. Even if the oil pump is forgotten to be turned off or there is a problem with the time relay, the motor will not burn out, the oil temperature will not rise, and thus the plate bending power will not be lost.
[0026] Please refer to Figure 1-2 A directional valve 15 is installed at the second pressure oil port 12, and the valve core 14 can move in the inner cavity to open or close the directional valve 15. In this way, the opening or closing of the directional valve 15 is limited by the movement of the valve core 14, thereby effectively limiting the opening or closing of the second pressure oil port 12.
[0027] Please refer to Figure 1-2 , a push piece 16 is provided on one end of the valve core 14 close to the directional valve 15, and the push piece 16 is used to control the opening or closing of the directional valve 15. Specifically, a valve port is provided on the directional valve 15, and the outer diameter of the push piece 16 is smaller than the outer diameter of the valve port. When the valve core 14 moves toward the direction close to the directional valve 15, the push piece 16 pushes against the valve port to force the valve port to open; when the valve core 14 moves away from the directional valve 15, the push piece 16 leaves the valve port to restore the valve port to a closed state. More specifically, the directional valve 15 is preferably a one-way valve.
[0028] Please refer to Figure 1-2 , the second pressure oil port 12 is located on the upper side of the valve body 10, the return oil port 13 is located on the lower side of the valve body 10, and the first pressure oil port 11 is located between the second pressure oil port 12 and the return oil port 13. In this way, the valve core 14 can move up and down in the inner cavity to control the opening or closing of the first pressure oil port 11 and the second pressure oil port 12.
[0029] The setting of the elastic member 17 must meet the following requirements: Figure 2When the pressure in the oil circuit rises above the safety value, the valve core 14 is squeezed by the oil, the valve core 14 moves upward, the elastic member 17 deforms, and the first pressure oil port 11 and the second pressure oil port 12 are opened; please refer to Figure 1 When the pressure is completely released and the valve core 14 is not squeezed by the oil, the elastic member 17 recovers its deformation, so that the valve core 14 can move downward to close the first pressure oil port 11 and the second pressure oil port 12.
[0030] Please refer to Figure 1-2 The elastic member 17 is preferably a spring. This arrangement can ensure the effective resetting of the valve core 14, making the dual-pressure relief valve simple in structure and low in cost.
[0031] Please refer to Figure 1-2 The valve core 14 has a sliding connection portion 18, which is used to slide with the inner wall of the inner cavity of the valve body 10 and divide the inner cavity into an upper cavity 19 and a lower cavity 20. The upper cavity 19 is connected to the oil return port 13 through the oil outlet 22, and the first pressure oil port 11 is connected to the lower cavity 20. The valve core 14 is slidably connected to the inner wall of the inner cavity of the valve body 10 through the sliding connection portion 18. When the pressure in the oil circuit rises above the safety value, please refer to Figure 2 The overflowing oil enters the lower cavity 20 through the first pressure oil port 11, driving the valve core 14 to move upward, thereby triggering the opening of the second pressure oil port 12, so that the overflowing oil enters the upper cavity 19 from the second pressure oil port 12, and the oil in the inner cavity returns through the oil outlet 22 and the oil return port 13 in turn. The downward movement of the valve core 14 will squeeze the oil in the lower cavity 20 and force it to leave the lower cavity 20, so that the valve core 14 can effectively reset and re-close the first pressure oil port 11 and the second pressure oil port 12.
[0032] Please refer to Figure 1-2 The sliding connection portion 18 is configured as a protrusion formed in the circumferential direction of the valve core 14. This configuration allows the valve core 14 to effectively slide on the inner wall of the inner cavity of the valve body 10 through the sliding connection portion 18.
[0033] Please refer to Figure 1-2 A sealing ring 21 is provided on one end of the valve core 14 close to the oil return port 13 to limit the first pressure oil port 11 from communicating with the oil return port 13 through the inner cavity. In this way, the sealing performance of the lower cavity 20 can be ensured, and the directional valve 15 at the second pressure oil port 12 can be used to ensure the sealing performance of the inner cavity.
[0034] Please refer to Figure 1-2 The first pressure oil port 11 is connected to the second pressure oil port 12 through the overflow channel. In this way, the first pressure oil port 11 and the second pressure oil port 12 can be connected, so that the oil can enter the second pressure oil port 12 through the overflow channel to achieve effective oil return.
[0035] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.
Claims
1. Dual pressure relief valve, characterized in that: include: The valve body has an inner cavity, a first pressure oil port, a second pressure oil port and an oil return port, wherein the inner cavity is communicated with the first pressure oil port, the second pressure oil port and the oil return port respectively, and the first pressure oil port is communicated with the second pressure oil port; The valve core can move in the inner cavity so that the first pressure oil port and the second pressure oil port can be opened or closed. The valve core is provided with an oil outlet, and the inner cavity is connected with the oil return port through the oil outlet.
2. The dual-pressure relief valve according to claim 1, characterized in that: A directional valve is installed at the second pressure oil port, and the valve core can move in the inner cavity to open or close the directional valve.
3. The dual-pressure relief valve according to claim 2, characterized in that: An abutment piece is arranged on one end of the valve core close to the directional valve, and the abutment piece is used to control the opening or closing of the directional valve.
4. The dual-pressure relief valve according to claim 1, characterized in that: The second pressure oil port is located at the upper side of the valve body, the oil return port is located at the lower side of the valve body, and the first pressure oil port is located between the second pressure oil port and the oil return port.
5. The dual-pressure relief valve according to claim 4, characterized in that: It also includes an elastic part. When the valve core is squeezed by the oil, the valve core moves upward, the elastic part is deformed, and the first pressure oil port and the second pressure oil port are opened; when the valve core is not squeezed by the oil, the elastic part restores its deformation, so that the valve core can move downward, and the first pressure oil port and the second pressure oil port are closed.
6. The dual-pressure relief valve according to claim 5, characterized in that: The elastic member is a spring.
7. The dual-pressure relief valve according to claim 1, characterized in that: The valve core is provided with a sliding connection portion, which is used to slidely connect with the inner wall of the valve body in the inner cavity and divide the inner cavity into an upper cavity and a lower cavity. The upper cavity is connected to the oil return port through the oil outlet, and the first pressure oil port is connected to the lower cavity.
8. The dual-pressure relief valve according to claim 7, characterized in that: The sliding connection portion is configured as a protrusion formed around the circumference of the valve core.
9. The dual-pressure relief valve according to claim 1, characterized in that: A sealing ring is arranged on one end of the valve core close to the oil return port to limit the first pressure oil port from being connected to the oil return port through the inner cavity.
10. The dual-pressure relief valve according to claim 1, characterized in that: The first pressure oil port is communicated with the second pressure oil port through an overflow channel.