CN214404787U - Electric proportional pressure valve - Google Patents
Electric proportional pressure valve Download PDFInfo
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- CN214404787U CN214404787U CN202120188697.5U CN202120188697U CN214404787U CN 214404787 U CN214404787 U CN 214404787U CN 202120188697 U CN202120188697 U CN 202120188697U CN 214404787 U CN214404787 U CN 214404787U
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Abstract
The utility model belongs to the technical field of proportional pressure valve technique and specifically relates to an electric proportional pressure valve, include: the electric proportional pressure valve has a first working state, a second working state and a third working state, and the design of the fixed cover matched with the valve core is ingeniously utilized so that the single proportional electromagnet can enable the electric proportional pressure valve to be freely switched among the three working states; the proportional electromagnet directly drives the valve core to act, so that the control precision is high and the response is fast; the closed-loop control of the pressure can be realized by depending on the air pressure logic, the power consumption of the proportional electromagnet can be effectively reduced, the development difficulty of a control system is reduced, the program control is simple and easy, and the market prospect is good.
Description
Technical Field
The utility model belongs to the technical field of proportional pressure valve technique and specifically relates to an electric proportional pressure valve.
Background
The electric proportional pressure valve is used as a highly integrated electromechanical integrated product, is the core of an electric proportional control technology, represents the development direction of a fluid control technology, and is widely applied to factory automation and vehicle control. The existing electric proportional pressure valve is generally controlled by two groups of two-position two-way high-frequency electromagnetic valves, and has the following problems:
the first and second groups of high-frequency electromagnetic valves need to continuously act to adjust the pressure, and when one of the first and second groups of high-frequency electromagnetic valves fails, the valve fails, so that the service life of the valve is prolonged;
secondly, a pilot gas chamber exists, and due to the compressibility of gas, the control precision is low and the response speed is slow;
thirdly, the environment resistance and the vibration resistance are poor, and the device cannot be particularly suitable for severe environments on vehicles;
fourthly, the structure is complex, the volume is large and the cost is high.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: in order to solve the problems that the structure is complex, the service life is short, the control precision is low and the response speed is slow as two groups of high-frequency electromagnetic valves are generally adopted for pressure regulation in the electric proportional pressure valve in the prior art, an electric proportional pressure valve is provided.
The utility model provides a technical scheme that its technical problem adopted is: an electrical proportional pressure valve comprising:
a valve body having a valve cavity, a port P1, a port P2 and a port P3;
the valve seat is provided with a valve hole and is fixed at the bottom end of the valve cavity;
the valve core penetrates through the central hole, and the bottom end of the valve core is inserted into the valve hole and is in sliding connection with the valve hole;
the proportional electromagnet is arranged at the top end of the valve cavity and is fixed on the valve body;
the fixed cover is fixed in the valve cavity and sleeved outside the valve seat, the top end of the fixed cover is provided with a top edge, a first cavity communicated with the P1 port is formed among the fixed cover, the valve seat and the valve core, a second cavity communicated with the P2 port is formed in the position, between the proportional electromagnet and the top edge of the fixed cover, in the valve cavity, and a third cavity communicated with the P3 port is formed between the bottom end of the valve core and the bottom end of the valve cavity;
the elastic element is used for pushing the valve core to abut against the top edge of the fixed cover; the electric proportional pressure valve has a first working state, a second working state and a third working state; when the valve core is in a first working state, the valve core props against the top edge, a first gap is formed between the push rod of the proportional electromagnet and the valve core, the central hole is communicated with the second cavity through the first gap, and the port P2 is communicated with the port P3; in the second working state, the valve core props against the top edge, the push rod of the proportional electromagnet moves downwards and blocks the upper end opening of the central hole, and the port P1, the port P2 and the port P3 are isolated from each other; and in a third working state, the push rod of the proportional electromagnet blocks the upper end opening of the central hole and pushes the valve core to move downwards to a position between the valve core and the top edge to form a second gap, the first cavity and the second cavity are communicated through the second gap, and the P1 port is communicated with the P2 port.
The design that the fixed cover is matched with the valve core is ingeniously utilized in the scheme, so that the single proportional electromagnet can enable the electric proportional pressure valve to be freely switched among three working states, the electric proportional pressure valve has the advantages of simple and reliable structure, low failure rate and low cost, can prolong the service life for a longer time, and can adapt to the harsh application environment of a vehicle; the proportional electromagnet directly drives the valve core to act, so that the control precision is high and the response is fast; the closed-loop control of the pressure can be realized by depending on the air pressure logic, the power consumption of the proportional electromagnet can be effectively reduced, the development difficulty of a control system is reduced, the program control is simple and easy, and the market prospect is good.
In order to prevent the reduction of pressure control precision caused by leakage and ensure the pressure control precision of the P2 port and the P3 port, the device further comprises a sealing unit;
when the valve core is in the first working state, the top edge of the fixed cover and the valve core form sealing through the sealing unit; to ensure that the first and second chambers remain isolated from each other;
when the second working state is carried out, the top edge of the fixed cover and the valve core form sealing through the sealing unit so as to ensure that the first cavity and the second cavity are kept isolated from each other, and the push rod and the valve core form sealing through the sealing unit so as to ensure that the second cavity and the third cavity are isolated from each other;
in a third working state, the push rod and the valve core form sealing on an opening at the upper end of the central hole through the sealing unit; to ensure that the second and third chambers are isolated from each other.
The following two schemes can be adopted for the specific structure of the sealing unit:
the first sealing unit scheme is: the sealing unit comprises a sealing gasket, the sealing gasket is fixed on the end surface of the top end of the valve core, and the top end opening of the central hole is positioned in the sealing gasket;
in the first working state, the top edge of the fixed cover is propped against the sealing gasket, namely the sealing gasket on the valve core is firmly propped against the top edge of the fixed cover under the action of the elastic element, so that the first cavity and the second cavity are ensured to be isolated from each other; the push rod is separated from the sealing gasket so as to ensure that a first gap formed between the push rod of the proportional electromagnet and the valve core can enable the upper end opening of the central hole to be communicated with the second cavity;
when the valve core is in a second working state, the top edge of the fixed cover is propped against the sealing gasket, namely the sealing gasket on the valve core is firmly propped against the top edge of the fixed cover under the action of the elastic element, so that the first cavity and the second cavity are ensured to be mutually isolated; the push rod is abutted against the sealing gasket, namely the push rod is abutted against the sealing gasket so as to seal the upper end opening of the central hole, and therefore the second cavity and the third cavity are isolated from each other;
in a third working state, the top edge of the fixed cover is separated from the sealing gasket so as to ensure that a second gap formed by the top edge of the fixed cover and the valve core can enable the first cavity to be communicated with the second cavity; the push rod is abutted against the sealing gasket, namely the push rod is abutted against the sealing gasket, so that the upper end opening of the central hole is sealed, and the second cavity and the third cavity are isolated from each other.
An elastic cavity is formed in the valve seat and positioned at the upper end of the valve hole, a step is protruded from the upper end of the outer peripheral surface of the valve core, one end of the elastic element props against the lower surface of the step, and the other end of the elastic element props against the cavity bottom of the elastic cavity; by means of the arrangement of the elastic cavity, the length of the elastic element can be prolonged, and the elastic force provided by the elastic element can be improved.
The second sealing unit scheme is: the sealing unit comprises a first sealing ring and a second sealing ring, the first sealing ring is fixed at the upper end of the valve core, and the second sealing ring is fixed on the push rod;
when the push rod is in a first working state, the top edge of the fixed cover props against the first sealing ring, namely the first sealing ring on the valve core firmly props against the top edge of the fixed cover under the action of the elastic element, so that the first cavity and the second cavity are ensured to be isolated from each other; a second sealing ring on the push rod is separated from the upper end of the valve core so as to ensure that a first gap formed between the push rod of the proportional electromagnet and the valve core can enable an upper end opening of the central hole to be communicated with the second cavity;
when the push rod is in a second working state, the top edge of the fixed cover props against the first sealing ring, namely the first sealing ring on the valve core firmly props against the top edge of the fixed cover under the action of the elastic element, so that the first cavity and the second cavity are ensured to be isolated from each other; a second sealing ring on the push rod props against the upper end of the valve core, and an opening at the top end of the central hole is positioned in the second sealing ring; the second sealing ring on the push rod is abutted against the end part of the top end of the valve core so as to seal the upper end opening of the central hole, thereby ensuring that the second cavity and the third cavity are isolated from each other;
when the push rod is in a third working state, the top edge of the fixed cover is separated from the valve core so as to ensure that a second gap formed by the top edge of the fixed cover and the valve core can enable the first cavity and the second cavity to be communicated; a second sealing ring on the push rod props against the upper end of the valve core, and an opening at the top end of the central hole is positioned in the second sealing ring; the second sealing ring on the push rod is abutted against the end part of the top end of the valve core so as to seal the upper end opening of the central hole, and therefore the second cavity and the third cavity are isolated from each other.
An elastic cavity is formed in the valve seat and positioned at the upper end of the valve hole, a step is protruded from the upper end of the outer peripheral surface of the valve core, one end of the elastic element props against the lower surface of the step, and the other end of the elastic element props against the cavity bottom of the elastic cavity; by means of the arrangement of the elastic cavity, the length of the elastic element can be prolonged, and the elastic force provided by the elastic element can be improved.
Furthermore, the valve core is sleeved with a connecting ring, the outer peripheral surface of the connecting ring is attached to the inner peripheral wall of the fixed cover, the inner peripheral surface of the connecting ring is attached to the outer peripheral surface of the valve core, the upper end of the elastic element abuts against the lower end face of the connecting ring, and the upper end face of the connecting ring abuts against the lower surface of the step; the arrangement of the connecting ring is convenient for the elastic element to firmly support the valve core upwards, and meanwhile, the connecting ring can improve the strength of the fixed cover on one hand and prevent the valve core from being eccentric on the other hand.
Further, the elastic element is a spring.
Furthermore, a third sealing ring is arranged between the proportional electromagnet and the inner circumferential surface of the valve cavity; so as to prevent the leakage at the joint between the proportional electromagnet and the valve cavity.
Furthermore, a fourth sealing ring is arranged between the fixed cover and the inner circumferential surface of the valve cavity; so as to prevent leakage at the joint between the fixed cover and the valve cavity.
Furthermore, the fixed cover is externally provided with a bottom edge, a sleeve is sleeved outside the fixed cover, one end of the sleeve props against the proportional electromagnet, the other end of the sleeve props against a fourth sealing ring, the fourth sealing ring props against the bottom edge of the fixed cover, and the bottom edge props against the valve seat; utilize telescopic setting, can compress tightly the fourth sealing washer, improve sealing performance, can also fix the cover between sleeve and disk seat simultaneously.
Furthermore, a fifth sealing ring is arranged between the bottom end of the outer peripheral surface of the valve core and the inner peripheral surface of the third cavity; so as to prevent the leakage at the joint between the bottom end of the outer peripheral surface of the valve core and the valve cavity and prevent the gas in the third cavity from entering the first cavity or entering the port P1 from the joint between the bottom end of the outer peripheral surface of the valve core and the valve cavity.
The utility model has the advantages that: the electric proportional pressure valve of the utility model skillfully utilizes the design that the fixed cover is matched with the valve core, so that a single proportional electromagnet can enable the electric proportional pressure valve to be freely switched among three working states, has the advantages of simple and reliable structure, low failure rate and low cost, can prolong the service life for a longer time, and can adapt to the harsh application environment of a vehicle; the proportional electromagnet directly drives the valve core to act, so that the control precision is high and the response is fast; the closed-loop control of the pressure can be realized by depending on the air pressure logic, the power consumption of the proportional electromagnet can be effectively reduced, the development difficulty of a control system is reduced, the program control is simple and easy, and the market prospect is good.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic view of an electric proportional pressure valve in embodiment 1 of the present invention;
FIG. 2 is an enlarged view of part A of FIG. 1;
fig. 3 is a schematic view of the electric proportional pressure valve in the second working state according to embodiment 1 of the present invention;
fig. 4 is a schematic view of the electric proportional pressure valve in the third working state according to embodiment 1 of the present invention;
fig. 5 is a schematic view of an electric proportional pressure valve in embodiment 2 of the present invention;
FIG. 6 is an enlarged view of a portion B of FIG. 5;
fig. 7 is a schematic view of the electric proportional pressure valve in the second working state according to embodiment 2 of the present invention;
fig. 8 is a schematic view of the electric proportional pressure valve in the third operating state according to embodiment 2 of the present invention.
In the figure: 1. the valve body comprises a valve body, ports 1a, P1, ports 1b, P2, ports 1c, P3 and 1d and a valve cavity;
2. valve seat 201, valve hole 202, elastic cavity;
3. a valve core 301, a central hole 302 and a step;
4. proportional electromagnet 401, push rod;
5. a fixed cover, 501, a top edge, 502, a bottom edge;
6. a first chamber, 7, a second chamber, 8, a third chamber;
9. the elastic element 10, the first gap, 11 and the second gap;
12. a sealing gasket 13, a first sealing ring 14 and a second sealing ring;
15. a connecting ring, 16, a third sealing ring, 17, a fourth sealing ring, 18, a fifth sealing ring, 19 and a sleeve.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic drawings, which illustrate the basic structure of the invention only in a schematic way, and thus show only the components that are relevant to the invention, and the directions and references (e.g., upper, lower, left, right, etc.) may be used only to help describe the features in the drawings. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the claimed subject matter is defined only by the appended claims and equivalents thereof.
Example 1
As shown in fig. 1 to 4, an electric proportional pressure valve includes:
a valve body 1 having a valve chamber 1d, a P1 port 1a, a P2 port 1b, and a P3 port 1 c;
the valve seat 2 is provided with a valve hole 201, and the valve seat 2 is fixed at the bottom end of the valve cavity 1 d;
the valve core 3 penetrates through the central hole 301, and the bottom end of the valve core 3 is inserted into the valve hole 201 and is connected with the valve hole 201 in a sliding mode;
the proportional electromagnet 4 is arranged at the top end of the valve cavity 1d and is fixed on the valve body 1;
the fixed cover 5 is fixed in the valve cavity 1d and sleeved outside the valve seat 2, the top end of the fixed cover 5 is provided with a top edge 501, a first cavity 6 communicated with a P1 port 1a is formed among the fixed cover 5, the valve seat 2 and the valve core 3, a second cavity 7 communicated with a P2 port 1b is formed in the valve cavity 1d at a position between the proportional electromagnet 4 and the top edge 501 of the fixed cover 5, and a third cavity 8 communicated with a P3 port 1c is formed between the bottom end of the valve core 3 and the bottom end of the valve cavity 1 d;
the elastic element 9 is used for pushing the valve core 3 to abut against the top edge 501 of the fixed cover 5, the elastic element 9 can be specifically a spring, and the top edge 501 of the embodiment can be specifically formed by punching and bending the top end of the fixed cover 5; the electric proportional pressure valve has a first working state, a second working state and a third working state; in the first working state, the valve core 3 is abutted against the top edge 501, a first gap 10 is formed between the push rod 401 of the proportional electromagnet 4 and the valve core 3, the central hole 301 is communicated with the second cavity 7 through the first gap 10, and the port P2 b is communicated with the port P3 1 c; in the second working state, the valve core 3 props against the top edge 501, the push rod 401 of the proportional electromagnet 4 moves downwards and blocks the upper end opening of the central hole 301, and the port P1 1a, the port P2 1b and the port P3 1c are isolated from each other; in the third working state, the push rod 401 of the proportional electromagnet 4 blocks the upper end opening of the central hole 301 and pushes the valve core 3 to move downwards to form a second gap 11 with the top edge 501, the first cavity 6 and the second cavity 7 are communicated through the second gap 11, and the port P1 a is communicated with the port P2 1 b.
Also includes a sealing unit;
in the first working state, a seal is formed between the top edge 501 of the fixed cover 5 and the valve core 3 through a sealing unit; to ensure that the first chamber 6 and the second chamber 7 are maintained isolated from each other;
in the second working state, the top edge 501 of the fixed cover 5 and the valve core 3 form a seal through a sealing unit to ensure that the first cavity 6 and the second cavity 7 are isolated from each other, and the push rod 401 and the valve core 3 form a seal through the sealing unit to the upper end opening of the central hole 301 to ensure that the second cavity 7 and the third cavity 8 are isolated from each other;
in a third working state, the upper end opening of the central hole 301 is sealed between the push rod 401 and the valve core 3 through a sealing unit; to ensure that the second chamber 7 and the third chamber 8 are isolated from each other.
The following two schemes can be adopted for the specific structure of the sealing unit, the following scheme is adopted in the embodiment, and the details of the other sealing unit are shown in the embodiment 2:
the sealing unit comprises a sealing gasket 12, the sealing gasket 12 is fixed on the top end face of the valve core 3, and the top end opening of the central hole 301 is positioned in the sealing gasket 12;
as shown in fig. 2, in the first operating condition, the top edge 501 of the fixed cover 5 abuts against the sealing gasket 12, i.e. the valve core 3, under the action of the elastic element 9, firmly abuts against the top edge 501 of the fixed cover 5 with the sealing gasket 12 thereon, thereby ensuring that the first chamber 6 and the second chamber 7 are kept isolated from each other; the push rod 401 is separated from the sealing gasket 12 so as to ensure that the first gap 10 formed between the push rod 401 of the proportional electromagnet 4 and the valve core 3 can enable the upper end opening of the central hole 301 to be communicated with the second cavity 7;
as shown in fig. 3, in the second operating condition, the top edge 501 of the fixed cover 5 abuts against the seal 12, i.e. the valve core 3, under the action of the elastic element 9, firmly abuts against the top edge 501 of the fixed cover 5 with the seal (12) thereon, so as to ensure that the first chamber 6 and the second chamber 7 are kept isolated from each other; the push rod 401 abuts against the sealing gasket 12, that is, the push rod 401 abuts against the sealing gasket 12, so that the upper end opening of the central hole 301 is sealed, and the second chamber 7 and the third chamber 8 are ensured to be isolated from each other;
as shown in fig. 4, in the third operating condition, the top edge 501 of the fixed cover 5 is separated from the sealing gasket 12 to ensure that the second gap 11 formed by the top edge 501 of the fixed cover 5 and the valve core 3 can communicate the first chamber 6 with the second chamber 7; the push rod 401 abuts against the seal 12, i.e. the push rod 401 abuts against the seal 12, thereby closing the upper end opening of the central bore 301 and ensuring the mutual isolation of the second chamber 7 and the third chamber 8.
An elastic cavity 202 is formed in the upper end of the valve seat 2 positioned in the valve hole 201, a step 302 is protruded from the upper end of the outer peripheral surface of the valve core 3, one end of the elastic element 9 props against the lower surface of the step 302, and the other end of the elastic element props against the cavity bottom of the elastic cavity 202; with the arrangement of the elastic cavity 202, the length of the elastic element 9 can be extended to increase the elastic force provided by the elastic element 9.
A third sealing ring 16 is arranged between the proportional electromagnet 4 and the inner circumferential surface of the valve cavity 1d, and the third sealing ring 16 can be an O-shaped sealing ring; so as to prevent leakage at the connection between the proportional electromagnet 4 and the valve chamber 1 d.
A fourth sealing ring 17 is arranged between the fixed cover 5 and the inner circumferential surface of the valve cavity 1d, and the fourth sealing ring 17 can be an O-shaped sealing ring; to prevent leakage at the connection between the fixed cage 5 and the valve chamber 1 d.
A bottom edge 502 is arranged outside the fixed cover 5, a sleeve 19 is sleeved outside the fixed cover 5, one end of the sleeve 19 is abutted against the proportional electromagnet 4, the other end of the sleeve 19 is abutted against the fourth sealing ring 17, the fourth sealing ring 17 is abutted against the bottom edge 502 of the fixed cover 5, and the bottom edge 502 is abutted against the valve seat 2; by the arrangement of the sleeve 19, the fourth sealing ring 17 can be pressed, the sealing performance is improved, and the fixing cover 5 can be fixed between the sleeve 19 and the valve seat 2; the bottom edge 502 in this embodiment may be formed by punching and bending the bottom end of the fixing cover 5.
A fifth sealing ring 18 is arranged between the bottom end of the outer peripheral surface of the valve core 3 and the inner peripheral surface of the third cavity 8, and the fifth sealing ring 18 can be an O-shaped sealing ring or a lip-shaped sealing ring; so as to prevent the leakage at the joint between the bottom end of the outer peripheral surface of the valve core 3 and the valve cavity 1d, and prevent the fluid medium in the third chamber 8 from entering the first chamber 6 or entering the port P1 a from the joint between the bottom end of the outer peripheral surface of the valve core 3 and the valve cavity 1 d.
The working principle of the embodiment is as follows:
when the electric proportional pressure valve is in a first working state: no control signal is output to the proportional electromagnet 4, the push rod 401 of the proportional electromagnet 4 is kept in the original position, at this time, the valve core 3 makes the sealing gasket 12 on the valve core firmly abut against the top edge 501 of the fixed cover 5 under the action of the elastic element 9, so as to ensure that the first cavity 6 and the second cavity 7 are kept isolated from each other, and then the port 1a of the P1 and the port 1b of the P2 are kept cut off; meanwhile, the push rod 401 is separated from the sealing gasket 12, the upper end opening of the central hole 301 is communicated with the second cavity 7 through a first gap 10 formed between the push rod 401 of the proportional electromagnet 4 and the valve core 3, the third cavity 8 is communicated with the second cavity 7 through the central hole 301, then the port 1b of P2 is communicated with the port 1c of P3, and the electric proportional pressure valve is in an exhaust state;
when the electric proportional pressure valve is in the second working state: when a control signal is output to the proportional electromagnet 4, the push rod 401 moves downwards, at the moment, the push rod 401 moves to abut against the sealing gasket 12, the second cavity 7 and the third cavity 8 are isolated from each other, and then the port P2 b and the port P3 1c are kept cut off; meanwhile, the valve core 3 makes the sealing gasket 12 firmly abut against the top edge 501 of the fixed cover 5 under the action of the elastic element 9, so that the first cavity 6 and the second cavity 7 are ensured to be isolated from each other, and accordingly, the port 1a of P1 and the port 1b of P2 are kept cut off, and the electric proportional pressure valve is in a middle sealing state;
when the electric proportional pressure valve is in a third working state: when a control signal is output to the proportional electromagnet 4, the push rod 401 continues to move downwards, at this time, the push rod 401 overcomes the elastic force of the elastic element 9 to push the valve core 3 downwards, so that the top edge 501 of the fixed cover 5 is separated from the sealing gasket 12, the second gap 11 formed by the top edge 501 of the fixed cover 5 and the valve core 3 enables the first cavity 6 to be communicated with the second cavity 7, and then the port 1a of P1 is communicated with the port 1b of P2; the valve core 3 is matched with the push rod 401 under the action of the elastic element 9 to clamp the sealing gasket 12, the upper end opening of the central hole 301 is sealed, the second cavity 7 and the third cavity 8 are isolated from each other, accordingly, the P2 port 1b and the P3 port 1c are kept cut off, and the electric proportional pressure valve is in an air inlet state.
The electric proportional pressure valve in the embodiment can adopt PID closed-loop regulation control, when the P2 port 1b needs to be increased in pressure from low pressure, the proportional electromagnet 4 receives an MCU control signal, the push rod 401 rapidly moves downwards, the electric proportional pressure valve rapidly enters a third working state, at the moment, the P1 port 1a rapidly inflates air to the P2 port 1b, the P2 port 1b is closed to the P3 port 1c, and the P2 port 1b rapidly establishes the vicinity of target pressure; when the port 1b of P2 stabilizes at the target pressure, the electric proportional pressure valve switches at a high frequency in the second operating state and the third operating state to maintain the target pressure.
When the pressure of the P2 port 1b needs to be reduced from high pressure to low pressure, the proportional electromagnet 4 receives an MCU control signal, the push rod 401 moves upwards rapidly, the electric proportional pressure valve enters a first working state rapidly, the P1 port 1a is cut off from the P2 port 1b, the P2 port 1b is communicated with the P3 port 1c, and the P2 port 1b is relieved to be close to a target pressure rapidly; when the port 1b of P2 stabilizes at the target pressure, the electric proportional pressure valve switches at a high frequency in the second operating state and the third operating state to maintain the target pressure.
In the scheme, the design that the fixed cover 5 is skillfully utilized to be matched with the valve core 3 is adopted, so that the single proportional electromagnet 4 can enable the electric proportional pressure valve to be freely switched among three working states, and the electric proportional pressure valve has the advantages of simple and reliable structure, low failure rate and low cost, can prolong the service life for a longer time, and can adapt to the harsh application environment of a vehicle; the proportional electromagnet 4 directly drives the valve core 3 to act, so that the control precision is high and the response is fast; the closed-loop control of the pressure can be realized by depending on the air pressure logic, the power consumption of the proportional electromagnet 4 can be effectively reduced, the development difficulty of a control system is reduced, the program control is simple and easy, and the market prospect is good.
Example 2
As shown in fig. 5, the difference between the embodiment 2 and the embodiment 1 is that the adopted sealing unit is different, specifically: the sealing unit comprises a first sealing ring 13 and a second sealing ring 14, the first sealing ring 13 is fixed at the upper end of the valve core 3, and the second sealing ring 14 is fixed on the push rod 401;
as shown in fig. 6, when the push rod 401 is in the first operating state, the top edge 501 of the fixed cover 5 abuts against the first sealing ring 13, that is, the valve core 3 firmly abuts against the top edge 501 of the fixed cover 5 with the first sealing ring 13 thereon under the action of the elastic element 9, thereby ensuring that the first chamber 6 and the second chamber 7 are kept isolated from each other; the second sealing ring 14 on the push rod 401 is separated from the upper end of the valve core 3, so that the first gap 10 formed between the push rod 401 of the proportional electromagnet 4 and the valve core 3 can enable the upper end opening of the central hole 301 to be communicated with the second cavity 7;
as shown in fig. 7, when the push rod 401 is in the second operating state, the top edge 501 of the fixed cover 5 abuts against the first sealing ring 13, that is, the valve core 3 firmly abuts against the top edge 501 of the fixed cover 5 with the first sealing ring 13 thereon under the action of the elastic element 9, thereby ensuring that the first chamber 6 and the second chamber 7 are kept isolated from each other; the second sealing ring 14 on the push rod 401 props against the upper end of the valve core 3, and the top end opening of the central hole 301 is positioned in the second sealing ring 14; the second sealing ring 14 on the push rod 401 is abutted against the top end of the valve core 3, so that the upper end opening of the central hole 301 is sealed, and the second cavity 7 and the third cavity 8 are ensured to be isolated from each other;
as shown in fig. 8, when the push rod 401 is in the third operating state, the top edge 501 of the fixed cover 5 is separated from the valve core 3, so as to ensure that the second gap 11 formed by the top edge 501 of the fixed cover 5 and the valve core 3 can communicate the first chamber 6 and the second chamber 7; the second sealing ring 14 on the push rod 401 props against the upper end of the valve core 3, and the top end opening of the central hole 301 is positioned in the second sealing ring 14; the second sealing ring 14 on the push rod 401 is used to abut against the top end of the valve core 3, so as to seal the upper end opening of the central hole 301, thereby ensuring that the second chamber 7 and the third chamber 8 are isolated from each other.
An elastic cavity 202 is formed in the upper end of the valve seat 2 positioned in the valve hole 201, a step 302 is protruded from the upper end of the outer peripheral surface of the valve core 3, one end of the elastic element 9 props against the lower surface of the step 302, and the other end of the elastic element props against the cavity bottom of the elastic cavity 202; with the arrangement of the elastic cavity 202, the length of the elastic element 9 can be extended to increase the elastic force provided by the elastic element 9.
The valve core 3 is sleeved with a connecting ring 15, the outer peripheral surface of the connecting ring 15 is attached to the inner peripheral wall of the fixed cover 5, the inner peripheral surface of the connecting ring 15 is attached to the outer peripheral surface of the valve core 3, the upper end of the elastic element 9 props against the lower end face of the connecting ring 15, and the upper end face of the connecting ring 15 props against the lower surface of the step 302; the arrangement of the connecting ring 15 is convenient for the elastic element 9 to firmly support the valve core 3 upwards, and meanwhile, the connecting ring 15 can improve the strength of the fixed cover 5 on one hand and prevent the valve core 3 from being eccentric on the other hand; wherein, a plurality of through holes are arranged on the connecting ring 15 along the axial direction, or an axial gap is left between the outer circumferential surface of the connecting ring 15 and the inner circumferential wall of the fixed cover 5, or an axial gap is left between the inner circumferential surface of the connecting ring 15 and the outer circumferential surface of the valve core 3, so as to prevent the connecting ring 15 from separating the second cavity 7 into two mutually isolated parts.
The working principle of the embodiment is as follows:
when the electric proportional pressure valve is in a first working state: no control signal is output to the proportional electromagnet 4, the push rod 401 of the proportional electromagnet 4 is kept in the original position, at this time, the valve core 3 makes the first sealing ring 13 on the valve core firmly abut against the top edge 501 of the fixed cover 5 under the action of the elastic element 9, so as to ensure that the first cavity 6 and the second cavity 7 are kept isolated from each other, and then the port 1a of P1 and the port 1b of P2 are kept cut off; meanwhile, the push rod 401 is separated from the sealing gasket 12, the upper end opening of the central hole 301 is communicated with the second cavity 7 through a first gap 10 formed between the push rod 401 of the proportional electromagnet 4 and the valve core 3, the third cavity 8 is communicated with the second cavity 7 through the central hole 301, then the port 1b of P2 is communicated with the port 1c of P3, and the electric proportional pressure valve is in an exhaust state;
when the electric proportional pressure valve is in the second working state: when a control signal is output to the proportional electromagnet 4, the push rod 401 moves downwards, at the moment, the second sealing ring 14 moved to the push rod 401 abuts against the upper end part of the valve core 3, the second cavity 7 and the third cavity 8 are isolated from each other, and then the port 1b of P2 and the port 1c of P3 are kept cut off; meanwhile, the valve core 3 makes the first sealing ring 13 firmly abut against the top edge 501 of the fixed cover 5 under the action of the elastic element 9, so that the first cavity 6 and the second cavity 7 are ensured to be isolated from each other, and accordingly, the port 1a of P1 and the port 1b of P2 are kept cut off, and the electric proportional pressure valve is in a middle sealing state;
when the electric proportional pressure valve is in a third working state: when a control signal is output to the proportional electromagnet 4, the push rod 401 continues to move downwards, at this time, the push rod 401 overcomes the elastic force of the elastic element 9 to push the valve core 3 downwards, so that the top edge 501 of the fixed cover 5 is separated from the first sealing ring 13, the second gap 11 formed by the top edge 501 of the fixed cover 5 and the valve core 3 enables the first cavity 6 and the second cavity 7 to be communicated, and then the port 1a of P1 is communicated with the port 1b of P2; the valve core 3 is matched with the push rod 401 to clamp the second sealing ring 14 under the action of the elastic element 9, the upper end opening of the central hole 301 is blocked, the second cavity 7 and the third cavity 8 are isolated from each other, accordingly, the P2 port 1b and the P3 port 1c are kept stopped, and the electric proportional pressure valve is in an air inlet state.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (12)
1. An electrical proportional pressure valve characterized by: the method comprises the following steps:
a valve body (1) having a valve chamber (1d), a P1 port (1a), a P2 port (1b), and a P3 port (1 c);
the valve seat (2) is provided with a valve hole (201), and the valve seat (2) is fixed at the bottom end of the valve cavity (1 d);
the valve core (3) penetrates through the central hole (301), and the bottom end of the valve core (3) is inserted into the valve hole (201) and is in sliding connection with the valve hole (201);
the proportional electromagnet (4) is arranged at the top end of the valve cavity (1d) and is fixed on the valve body (1);
the fixed cover (5) is fixed in the valve cavity (1d) and sleeved outside the valve seat (2), the top end of the fixed cover (5) is provided with a top edge (501), a first cavity (6) communicated with the P1 port (1a) is formed among the fixed cover (5), the valve seat (2) and the valve core (3), a second cavity (7) communicated with the P2 port (1b) is formed in the valve cavity (1d) at a position between the proportional electromagnet (4) and the top edge (501) of the fixed cover (5), and a third cavity (8) communicated with the P3 port (1c) is formed between the bottom end of the valve core (3) and the bottom end of the valve cavity (1 d);
and an elastic element (9) for pushing the valve core (3) against the top edge (501) of the fixed cover (5); the electric proportional pressure valve has a first working state, a second working state and a third working state;
when the valve core (3) is in a first working state, the valve core (3) is abutted against the top edge (501), a first gap (10) is formed between the push rod (401) of the proportional electromagnet (4) and the valve core (3), the central hole (301) is communicated with the second cavity (7) through the first gap (10), and the P2 port (1b) is communicated with the P3 port (1 c);
in the second working state, the valve core (3) is propped against the top edge (501), the push rod (401) of the proportional electromagnet (4) moves downwards and blocks the upper end opening of the central hole (301), and the port P1 (1a), the port P2 (1b) and the port P3 (1c) are isolated from each other;
and in a third working state, the push rod (401) of the proportional electromagnet (4) blocks the upper end opening of the central hole (301), the valve core (3) is pushed to move downwards to a position between the push rod and the top edge (501) to form a second gap (11), the first cavity (6) is communicated with the second cavity (7) through the second gap (11), and the port P1 (1a) is communicated with the port P2 (1 b).
2. The electrical proportional pressure valve of claim 1, wherein: also includes a sealing unit;
when the valve is in the first working state, the top edge (501) of the fixed cover (5) and the valve core (3) form sealing through a sealing unit;
when the valve core (3) is in the second working state, the top edge (501) of the fixed cover (5) and the valve core (3) form sealing through the sealing unit, and the push rod (401) and the valve core (3) form sealing through the sealing unit on the upper end opening of the central hole (301);
and in the third working state, the upper end opening of the central hole (301) is sealed between the push rod (401) and the valve core (3) through a sealing unit.
3. The electrical proportional pressure valve of claim 2, wherein: the sealing unit comprises a sealing gasket (12), the sealing gasket (12) is fixed on the end surface of the top end of the valve core (3), and the top end opening of the central hole (301) is positioned in the sealing gasket (12);
when the device is in a first working state, the top edge (501) of the fixed cover (5) props against the sealing gasket (12), and the push rod (401) is separated from the sealing gasket (12);
in the second working state, the top edge (501) of the fixed cover (5) is pressed against the sealing gasket (12), and the push rod (401) is pressed against the sealing gasket (12);
in the third working state, the top edge (501) of the fixed cover (5) is separated from the sealing gasket (12), and the push rod (401) pushes against the sealing gasket (12).
4. The electrical proportional pressure valve of claim 3, wherein: an elastic cavity (202) is formed in the upper end, located in the valve hole (201), of the valve seat (2), a step (302) protrudes from the upper end of the outer peripheral surface of the valve core (3), one end of the elastic element (9) abuts against the lower surface of the step (302), and the other end of the elastic element abuts against the cavity bottom of the elastic cavity (202).
5. The electrical proportional pressure valve of claim 2, wherein: the sealing unit comprises a first sealing ring (13) and a second sealing ring (14), the first sealing ring (13) is fixed at the upper end of the valve core (3), and the second sealing ring (14) is fixed on the push rod (401);
when the push rod (401) is in a first working state, the top edge (501) of the fixed cover (5) props against the first sealing ring (13), and the second sealing ring (14) on the push rod (401) is separated from the upper end of the valve core (3);
when the push rod (401) is in a second working state, the top edge (501) of the fixed cover (5) props against the first sealing ring (13), the second sealing ring (14) on the push rod (401) props against the upper end of the valve core (3), and the top opening of the central hole (301) is positioned in the second sealing ring (14);
when the push rod (401) is in a third working state, the top edge (501) of the fixed cover (5) is separated from the valve core (3), the second sealing ring (14) on the push rod (401) props against the upper end of the valve core (3), and the top opening of the central hole (301) is positioned in the second sealing ring (14).
6. The electrical proportional pressure valve of claim 5, wherein: an elastic cavity (202) is formed in the upper end, located in the valve hole (201), of the valve seat (2), a step (302) protrudes from the upper end of the outer peripheral surface of the valve core (3), one end of the elastic element (9) abuts against the lower surface of the step (302), and the other end of the elastic element abuts against the cavity bottom of the elastic cavity (202).
7. The electrical proportional pressure valve of claim 6, wherein: the valve core (3) is sleeved with a connecting ring (15), the outer peripheral surface of the connecting ring (15) is attached to the inner peripheral wall of the fixed cover (5), the inner peripheral surface of the connecting ring (15) is attached to the outer peripheral surface of the valve core (3), the upper end of the elastic element (9) abuts against the lower end face of the connecting ring (15), and the upper end face of the connecting ring (15) abuts against the lower surface of the step (302).
8. The electric proportional pressure valve of any of claims 1-7, wherein: the elastic element (9) is a spring.
9. The electric proportional pressure valve of any of claims 1-7, wherein: and a third sealing ring (16) is arranged between the proportional electromagnet (4) and the inner circumferential surface of the valve cavity (1 d).
10. The electric proportional pressure valve of any of claims 1-7, wherein: and a fourth sealing ring (17) is arranged between the fixed cover (5) and the inner circumferential surface of the valve cavity (1 d).
11. The electrical proportional pressure valve of claim 10, wherein: the fixed cover (5) is externally provided with a bottom edge (502), the fixed cover (5) is externally sleeved with a sleeve (19), one end of the sleeve (19) is propped against the proportional electromagnet (4), the other end of the sleeve (19) is propped against the fourth sealing ring (17), the fourth sealing ring (17) is propped against the bottom edge (502) of the fixed cover (5), and the bottom edge (502) is propped against the valve seat (2).
12. The electric proportional pressure valve of any of claims 1-7, wherein: and a fifth sealing ring (18) is arranged between the bottom end of the outer peripheral surface of the valve core (3) and the inner peripheral surface of the third cavity (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120188697.5U CN214404787U (en) | 2021-01-22 | 2021-01-22 | Electric proportional pressure valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120188697.5U CN214404787U (en) | 2021-01-22 | 2021-01-22 | Electric proportional pressure valve |
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| Publication Number | Publication Date |
|---|---|
| CN214404787U true CN214404787U (en) | 2021-10-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120188697.5U Active CN214404787U (en) | 2021-01-22 | 2021-01-22 | Electric proportional pressure valve |
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| CN (1) | CN214404787U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114837801A (en) * | 2021-02-02 | 2022-08-02 | 苏州恩都法汽车系统有限公司 | Pressure reducing proportional valve and engine waste gas bypass control system |
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2021
- 2021-01-22 CN CN202120188697.5U patent/CN214404787U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114837801A (en) * | 2021-02-02 | 2022-08-02 | 苏州恩都法汽车系统有限公司 | Pressure reducing proportional valve and engine waste gas bypass control system |
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