Pressure release valve and air spring
By employing an automatically controlled pressure relief valve in the air spring system, the problems of large space occupation and high cost of solenoid valves are solved, realizing pressure relief function without electrical control and improving the economy and reliability of the system.
Patent Information
- Application Number
- CN202422786365.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-15
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-11-15
AI Technical Summary
In existing air spring systems, solenoid valves require power, occupy a large space, affect the overall vehicle layout, and are costly.
A pressure relief valve is adopted, including a valve body, a valve seat, a valve stem, and a spring. The valve stem is automatically controlled to open and close by air pressure difference, so as to realize the connection or isolation between the main chamber and the auxiliary chamber, thus avoiding the use of an electrical control system.
It eliminates the need for an electrical control system, saving space and cost, while also enabling automatic adjustment of the internal pressure of the air spring, thus improving the system's reliability and economy.
Smart Images
Figure CN223594834U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to air spring accessories field, especially relate to a pressure relief valve and air spring. BACKGROUND
[0002] At present, air suspension is applied more and more widely, and many based on existing vehicle chassis are upgraded to air springs, and the space is limited, and most of them should be electric cars, and the load is larger, and at the same time, more and more off-road vehicles also begin to apply air springs, and the stroke of such vehicles is usually larger.
[0003] The air spring mainly fills high-pressure gas in the inside, and provides a certain stiffness for the suspension, and the principle of the support force provided by the air spring is pressure x area, so in the limited space, the heavier the car, the higher the pressure required, when the wheels move up and down, the pressure becomes lower when the air spring is stretched, and the pressure becomes higher when it is compressed, so when the wheel stroke is large, the pressure to the limit will be higher, and under the same compression amount, the smaller the air spring volume, the higher the pressure after compression.
[0004] At present, the auxiliary chamber and the main chamber of the conventional double-cavity air spring are connected or disconnected by an electromagnetic valve to control whether they are connected, and in the above case, the main chamber and the auxiliary chamber are connected to increase the volume, so as to avoid high pressure, the main defects of the prior art are that the electromagnetic valve needs to be connected to electricity, occupies a large space, affects the whole vehicle arrangement, and needs to be matched with an electric control system for active control, and the cost is high. SUMMARY
[0005] The utility model discloses a kind of pressure relief valves, it can be set on piston, not only save electric control part, save cost, also reduce the space required for installation.
[0006] To solve the above technical problems, the utility model discloses the following technical scheme: a pressure relief valve, it includes the valve body, the valve seat fixed on the valve body, the valve rod that can move up and down is connected in the valve body, and the spring is equipped between the valve rod and the valve body, the first air passage that is opened up and down is passed through on the valve seat, the first cavity for installing the valve rod is equipped with in the valve body and is located the first air passage below, the second air passage is opened on the valve body and extends to the first cavity body upper end, the third air passage is opened on the valve body and extends to the first cavity body lower end, the upper end face of the valve rod forms the head and is opened the mounting hole on the lower end face, the spring makes the valve rod always have the tendency of moving towards the first air passage, the valve rod has at least opening and closing state, when the pressure of the gas pressure in the first air passage to the head is greater than the pressure of the gas pressure in the third air passage to the valve rod and the thrust of the spring to the valve rod, the head leaves the first air passage, the valve rod is in the opening state, when the pressure of the gas pressure in the first air passage to the head is not greater than the pressure of the gas pressure in the third air passage to the valve rod and the thrust of the spring to the valve rod, the head is sealed on the lower end of the first air passage, and the valve rod is in the closed state.
[0007] Another embodiment, the second air passage is extended to the upper end face of the first cavity by the peripheral surface of the valve body.
[0008] Another embodiment, the peripheral surface on the lower end of the head is equipped with the first sealing ring, when the valve rod is in the closed state, the first sealing ring is sealed and is attached on the inside wall of the valve seat forming the first air passage.
[0009] Another embodiment, the valve rod is equipped in the first cavity and the mounting hole is communicated with the third air passage, and the third air passage is isolated with the second air passage.
[0010] Another embodiment, the valve seat includes the seat body and the valve ring formed on the lower end face of the seat body, and the first air passage is opened on the valve ring and the seat body, and when the valve rod is in the closed state, the head is sealed on the valve ring.
[0011] The utility model also provides a kind of air spring, it includes piston, main capsule skin of lower end portion sleeve set on the upper end portion of the piston and pressure relief valve, the pressure relief valve is above-mentioned pressure relief valve, main cavity is formed in the inside of main capsule skin, always with the first air passage communication, the second cavity and the third cavity are formed in the inside of the piston, the third cavity is communicated with atmosphere, the pressure relief valve is installed in the piston, the second air passage is always communicated with the second cavity, the third air passage is always communicated with atmosphere by the third cavity;When the valve rod is in the closed state, the head is sealed on valve seat, and the main cavity is isolated with second cavity;When the valve rod is in the opening state, the head leaves the valve seat, and the main cavity is communicated with second cavity.
[0012] In another embodiment, a gas nozzle is arranged on the circumferential surface of the piston for inflating the main chamber.
[0013] In another embodiment, an inflation pipe is arranged in the piston, the upper end of the inflation pipe is communicated with the main chamber, and the lower end of the inflation pipe is communicated with the gas nozzle.
[0014] In another embodiment, the top of the piston extends downward to form an upper mounting cylinder, the upper mounting cylinder is formed with an upper hollow baffle, the upper end of the valve seat is sealed and abuts against the lower end surface of the upper baffle, the inside of the upper mounting cylinder is communicated with the main chamber, the first channel is communicated with the main chamber through the upper mounting cylinder, and the side wall of the valve seat and the upper mounting cylinder is arranged with a second sealing ring.
[0015] In another embodiment, the bottom of the piston extends upward to form a lower mounting cylinder, the lower mounting cylinder is formed with a lower hollow baffle, the lower end of the valve body is sealed and abuts against the upper end surface of the lower baffle, the inside of the lower mounting cylinder is communicated with the atmosphere, the third channel is communicated with the atmosphere through the lower mounting cylinder, the side wall of the valve body and the lower mounting cylinder is arranged with a third sealing ring, and the circumferential surface of the valve rod and the valve body is arranged with a fourth sealing ring.
[0016] The utility model discloses the beneficial effect lies in: when the gas pressure of main chamber is too high, the passive pressure relief valve is opened and communicated with the main chamber and the second chamber automatically, thereby reducing the pressure inside the air spring, when the gas pressure of main chamber is moderate, the main chamber and the second chamber are isolated, and since the pressure relief is arranged on the piston of the air spring, it is not necessary to set an electromagnetic valve outside the air spring, and space and production cost can be effectively saved. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 It is the structure schematic diagram of air spring in example one;
[0018] Figure 2 It is the structure schematic diagram of pressure relief valve closed state in example one;
[0019] Figure 3 It is the structure schematic diagram of pressure relief valve open state in example one (the dotted line with arrow in the drawing indicates the gas flow direction);
[0020] Figure 4 It is the structure schematic diagram of pressure relief valve open state in example two. DETAILED DESCRIPTION
[0021] The utility model will be described in detail below in combination with the embodiments shown in the drawings:
[0022] Example one
[0023] As shown in Figure 1 The air spring comprises a piston 4, a main bladder skin 2 sleeved on the lower end of the piston 4, and a pressure relief valve 1.
[0024] As shown in Figures 2-3 The pressure relief valve 1 comprises a valve body 11, a valve seat 12 fixed on the valve body 11, a valve rod 13 movably connected in the valve body 11, and a spring 14 arranged between the valve rod 13 and the valve body 11. The valve seat 12 is provided with a first air passage 15 extending through the valve seat 12. The valve body 11 is internally provided with a first cavity 16 for installing the valve rod 13, a second air passage 17 extending to the upper end of the first cavity 16, and a third air passage 18 extending to the lower end of the first cavity 16. The upper end surface of the valve rod 13 is formed with a head 19, and the lower end surface is provided with a mounting hole 111. The top area of the mounting hole 111 is S1, and the area of the upper end surface of the head 19 is S2. S1 is greater than S2. The spring 14 always makes the valve rod 13 have a tendency to move towards the first air passage 15. The valve rod 13 has at least an open state and a closed state. The main chamber 3 is always in communication with the first air passage 15.
[0025] The second air passage 17 extends from the peripheral surface of the valve body 11 to the upper end surface of the first cavity 16. The peripheral surface of the lower end of the head 19 is provided with a first sealing ring 91, which is sealed and fitted on the inner side wall of the first air passage 15 formed by the valve seat 12 when the valve rod 13 is in the closed state. The valve rod 13 is arranged in the first cavity 16, and the mounting hole 111 is in communication with the third air passage 18, which is isolated from the second air passage 17. The valve seat 12 comprises a seat body 10 and a valve ring 110 formed on the lower end surface of the seat body 10. The first air passage 15 is formed in the valve ring 110 and the seat body 10. When the valve rod 13 is in the closed state, the head 19 is blocked on the valve ring 110.
[0026] The piston 4 is internally formed with a second cavity 42 and a third cavity 43, which is in communication with the atmosphere. The pressure relief valve 1 is installed in the piston 4. The second air passage 17 is always in communication with the second cavity 42, and the third air passage 18 is always in communication with the atmosphere through the third cavity 43. When the valve rod 13 is in the closed state, the head 19 is blocked on the valve seat 12, and the main chamber 3 is isolated from the second cavity 42. When the valve rod 13 is in the open state, the head 19 is away from the valve seat 12, and the main chamber 3 is in communication with the second cavity 42. The peripheral surface of the piston 4 is provided with an air nozzle 6 for inflating the main chamber 3. The piston 4 is internally provided with an inflation pipe 5, the upper end of which is in communication with the main chamber 3, and the lower end of which is in communication with the air nozzle 6.
[0027] The top of the piston 4 extends downward to form an upper mounting cylinder 44, the upper mounting cylinder 44 is formed with an upper hollow baffle 46, the upper end of the valve seat 12 is sealed through the upper mounting cylinder 44 and abuts the lower end face of the upper baffle 46, the inside of the upper mounting cylinder 44 is communicated with the main chamber 3, the first channel is communicated with the main chamber 3 through the upper mounting cylinder 44, the side wall of the valve seat 12 and the upper mounting cylinder 44 is provided with a second sealing ring 92; the bottom of the piston 4 extends upward to form a lower mounting cylinder 45, the lower mounting cylinder 45 is formed with a lower hollow baffle 47, the lower end of the valve body 11 is sealed through the lower mounting cylinder 45 and abuts the upper end face of the lower baffle 47, the inside of the lower mounting cylinder 45 is communicated with the atmosphere, the third channel is communicated with the atmosphere through the lower mounting cylinder 45, the side wall of the valve body 11 and the lower mounting cylinder 45 is provided with a third sealing ring 93; the peripheral surface of the valve rod 13 abutting the valve body 11 is provided with a fourth sealing ring 94.
[0028] When the pressure of the gas in the first gas channel 15 on the sealing head 19 is greater than the sum of the pressure of the gas in the third gas channel 18 on the valve rod 13 and the thrust of the spring 14 on the valve rod 13, the sealing head 19 leaves the first gas channel 15, and the valve rod 13 is in an open state; when the pressure of the gas in the first gas channel 15 on the sealing head 19 is not greater than the sum of the pressure of the gas in the third gas channel 18 on the valve rod 13 and the thrust of the spring 14 on the valve rod 13, the sealing head 19 is sealed on the lower end of the first gas channel 15, and the valve rod 13 is in a closed state.
[0029] Example two
[0030] The air spring includes a piston 4, a main capsule skin 2 sleeved on the upper end of the piston 4, and a pressure relief valve 1.
[0031] The difference between this embodiment and example one is that the first sealing ring in example one is replaced by a first sealing plate 95, as shown in Figure 4 The pressure relief valve 1 includes a valve body 11, a valve seat 12 fixed on the valve body 11, a valve rod 13 movably connected in the valve body 11, and a spring 14 arranged between the valve rod 13 and the valve body 11, the valve seat 12 is provided with a first gas channel 15 penetrating upward and downward, the inside of the valve body 11 and below the first gas channel 15 is provided with a first cavity 16 for mounting the valve rod 13, a second gas channel 17 is arranged on the valve body 11 and extends to the upper end of the first cavity 16, and a third gas channel 18 is arranged on the valve body 11 and extends to the lower end of the first cavity 16, the upper end face of the valve rod 13 is formed with a sealing head 19 and the lower end face is provided with a mounting hole, the top area of the mounting hole is S1, the area of the upper end face of the sealing head 19 is S2, S1 is greater than S2, the spring 14 always has a tendency to move the valve rod 13 towards the first gas channel 15, the valve rod 13 has at least an open and closed state, and the main chamber 3 forms a main chamber 3 always communicated with the first gas channel 15.
[0032] The second air passage 17 extends from the peripheral surface of the valve body 11 to the upper end surface of the first cavity 16. A first sealing plate 95 is sleeved on the outer peripheral surface of the lower end of the head 19, and is sealed and fitted on the first air passage 15 when the valve rod 13 is in the closed state. The valve rod 13 is arranged in the first cavity 16 and the mounting hole is in communication with the third air passage 18 which is isolated from the second air passage 17. The valve seat 12 comprises a seat body 10 and a valve ring 110 formed on the lower end surface of the seat body 10, and the first air passage 15 is formed in the valve ring 110 and the seat body 10. When the valve rod 13 is in the closed state, the head 19 is arranged in the first air passage 15, and the lower end surface of the valve ring 110 is sealed and fitted on the upper end surface of the first sealing plate 95 to isolate the first air passage 15 from the second air passage 17, so that the first sealing plate 95 can completely block the first air passage 15 even if the head 19 is offset.
[0033] The piston 4 is internally formed with a second cavity 42 and a third cavity 43 which is in communication with the atmosphere. The pressure relief valve 1 is arranged in the piston 4, the second air passage 17 is always in communication with the second cavity 42, and the third air passage 18 is always in communication with the atmosphere through the third cavity 43. When the valve rod 13 is in the closed state, the head 19 blocks the valve seat 12, and the main chamber 3 is isolated from the second cavity 42. When the valve rod 13 is in the open state, the head 19 is separated from the valve seat 12, and the main chamber 3 is in communication with the second cavity 42. The peripheral surface of the piston 4 is provided with an air nozzle 6 for inflating the main chamber 3. The piston 4 is internally provided with an inflation pipe 5, the upper end of which is in communication with the main chamber 3, and the lower end of which is in communication with the air nozzle 6.
[0034] The top of the piston 4 is downwardly extended to form an upper mounting cylinder 44, the upper mounting cylinder 44 is internally formed with a hollow upper baffle 46, the upper end of the valve seat 12 is sealingly arranged in the upper mounting cylinder 44 and abuts against the lower end surface of the upper baffle 46, the interior of the upper mounting cylinder 44 is in communication with the main chamber 3, the first passage is in communication with the main chamber 3 through the upper mounting cylinder 44, and the side wall of the valve seat 12 and the upper mounting cylinder 44 is provided with a second sealing ring 92. The bottom of the piston 4 is upwardly extended to form a lower mounting cylinder 45, the lower mounting cylinder 45 is internally formed with a hollow lower baffle 47, the lower end of the valve body 11 is sealingly arranged in the lower mounting cylinder 45 and abuts against the upper end surface of the lower baffle 47, the interior of the lower mounting cylinder 45 is in communication with the atmosphere, the third passage is in communication with the atmosphere through the lower mounting cylinder 45, and the side wall of the valve body 11 and the lower mounting cylinder 45 is provided with a third sealing ring 93. The peripheral surface of the valve rod 13 abutting against the valve body 11 is provided with a fourth sealing ring 94.
[0035] When the pressure of the gas in the first gas passage 15 against the head 19 is greater than the sum of the pressure of the gas in the third gas passage 18 against the valve stem 13 and the thrust of the spring 14 against the valve stem 13, the head 19 is away from the first gas passage 15, and the valve stem 13 is in the open state; when the pressure of the gas in the first gas passage 15 against the head 19 is not greater than the sum of the pressure of the gas in the third gas passage 18 against the valve stem 13 and the thrust of the spring 14 against the valve stem 13, the first sealing plate 95 is sealed on the valve ring 110, and the valve stem 13 is in the closed state.
[0036] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made in accordance with the spirit of the present application shall be covered within the protection scope of the present application.
Claims
1. A pressure relief valve comprising a valve body, a valve seat fixed to the valve body, a valve stem connected to the valve body and movable up and down, and a spring provided between the valve stem and the valve body, characterized in that: The valve seat is provided with a first air passage penetrating upward and downward, the valve body is provided with a first cavity for installing the valve rod, a second air passage penetrating the valve body and extending to the upper end of the first cavity, and a third air passage penetrating the valve body and extending to the lower end of the first cavity, the upper end surface of the valve rod is provided with a head, and the lower end surface is provided with an installation hole, the spring always makes the valve rod have a tendency to move towards the first air passage, the valve rod has at least an opening and closing state, when the pressure of the gas in the first air passage against the head is greater than the sum of the pressure of the gas in the third air passage against the valve rod and the thrust of the spring against the valve rod, the head is away from the first air passage, and the valve rod is in the opening state, when the pressure of the gas in the first air passage against the head is not greater than the sum of the pressure of the gas in the third air passage against the valve rod and the thrust of the spring against the valve rod, the head is sealed to the lower end of the first air passage, and the valve rod is in the closing state.
2. The pressure relief valve of claim 1, wherein: The second air passage extends from the peripheral surface of the valve body to the upper end surface of the first cavity.
3. The pressure relief valve of claim 1, wherein: A first sealing ring is arranged on the peripheral surface of the lower end of the head, and the first sealing ring is sealed and fitted on the inner side wall of the first air passage formed by the valve seat when the valve rod is in the closing state.
4. The pressure relief valve of claim 1, wherein: The valve rod is arranged in the first cavity and the installation hole is communicated with the third air passage, and the third air passage is isolated from the second air passage.
5. The pressure relief valve of claim 1, wherein: The valve seat comprises a seat body and a valve ring formed on the lower end surface of the seat body, the first air passage is arranged on the valve ring and the seat body, and the head is sealed to the valve ring when the valve rod is in the closing state.
6. An air spring comprising a piston, a main bladder skin having a lower end portion sleeved over an upper end portion of the piston, and a pressure relief valve, characterized by: The pressure relief valve is the pressure relief valve in any one of claims 1-5, a main cavity is formed in the inside of the main capsule skin and always communicated with the first air passage, a second cavity and a third cavity are formed in the inside of the piston, the third cavity is communicated with the atmosphere, the pressure relief valve is arranged in the piston, the second air passage is always communicated with the second cavity, and the third air passage is always communicated with the atmosphere through the third cavity; when the valve rod is in the closing state, the head is sealed to the valve seat, and the inside of the main capsule skin is isolated from the second cavity; when the valve rod is in the opening state, the head is away from the valve seat, and the main cavity is communicated with the second cavity.
7. The air spring of claim 6, wherein: A gas nozzle is arranged on the peripheral surface of the piston and used for inflating the main cavity.
8. The air spring of claim 7, wherein: An inflation pipe is arranged in the piston, the upper end of the inflation pipe is communicated with the main cavity, and the lower end is communicated with the gas nozzle.
9. The air spring of claim 6, wherein: The top of the piston downwardly extends to form an upper installation cylinder, the upper installation cylinder is formed with an upper hollow baffle, the upper end of the valve seat is sealed and arranged in the upper installation cylinder and abuts against the lower end surface of the upper baffle, the inside of the upper installation cylinder is communicated with the main cavity, and the first passage is communicated with the main cavity through the upper installation cylinder.
10. The air spring of claim 6, wherein: The bottom of the piston upwardly extends to form a lower installation cylinder, the lower installation cylinder is formed with a lower hollow baffle, the lower end of the valve body is sealed and arranged in the lower installation cylinder and abuts against the upper end surface of the lower baffle, the inside of the lower installation cylinder is communicated with the atmosphere, and the third passage is communicated with the atmosphere through the lower installation cylinder.