CN112539284B - Flow control valve - Google Patents
Flow control valve Download PDFInfo
- Publication number
- CN112539284B CN112539284B CN201910890288.7A CN201910890288A CN112539284B CN 112539284 B CN112539284 B CN 112539284B CN 201910890288 A CN201910890288 A CN 201910890288A CN 112539284 B CN112539284 B CN 112539284B
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- Prior art keywords
- sealing
- valve
- flow control
- seal ring
- control valve
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- 238000007789 sealing Methods 0.000 claims abstract description 134
- 239000012530 fluid Substances 0.000 claims description 88
- 239000000306 component Substances 0.000 claims description 15
- 239000008358 core component Substances 0.000 claims description 13
- 238000003825 pressing Methods 0.000 claims description 12
- 230000007704 transition Effects 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 8
- 230000000903 blocking effect Effects 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 15
- 230000004048 modification Effects 0.000 description 10
- 238000012986 modification Methods 0.000 description 10
- 238000013461 design Methods 0.000 description 5
- 238000009826 distribution Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/22—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution
- F16K3/24—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution with cylindrical valve members
- F16K3/246—Combination of a sliding valve and a lift valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
- F16K3/314—Forms or constructions of slides; Attachment of the slide to the spindle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
- F16K3/316—Guiding of the slide
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sliding Valves (AREA)
- Lift Valve (AREA)
Abstract
The invention discloses a flow control valve, wherein a valve core comprises a body part and an expanded diameter part arranged below the body part, the body part and the expanded diameter part are approximately circular, the outer diameter of the expanded diameter part is larger than that of the body part, the lower end of the expanded diameter part comprises a sealing part, and a first preset gap positioned at the lower side of a sealing part is arranged between the valve core and a guiding part; when the sealing part is abutted with the sealing ring, the sealing part comprises a sealing inner edge annular line and a sealing outer edge annular line, and a projection annular line of the outer edge of the body part in the vertical direction of the sealing ring is positioned between the sealing inner edge annular line and the sealing outer edge annular line; an inner annular surface is formed between the defined sealing inner edge annular line and the projection annular line, the area of the inner annular surface is S Inner part , an outer annular surface is formed between the defined sealing outer edge annular line and the projection annular line, the area of the outer annular surface is S Outer part , the flow area of the defined first preset gap is S 1, and then S Outer part ＞S Inner part ,S Outer part ＞S1, the inner leakage of the flow control valve in the valve closing state can be improved.
Description
Technical Field
The invention relates to the technical field of fluid control, in particular to a flow control valve.
Background
In the technical field of fluid control, flow control valves are widely used for controlling the circulation of fluid, and generally comprise a fluid inlet, a fluid outlet, a valve port and a valve core. The valve core can move to be abutted against or separated from the valve port under the drive of the transmission part, so that the fluid communication (valve opening) between the fluid inlet and the fluid outlet is controlled, the fluid is disconnected (valve closing) or the flow rate between the fluid inlet and the fluid outlet is regulated. In the case of a flow control valve, improving the internal leakage of the flow control valve in the closed state is a technical problem that has been diligently solved by those skilled in the art.
Disclosure of Invention
The invention provides a flow control valve capable of improving internal leakage of the flow control valve in a closed state.
The invention provides a flow control valve, which comprises a valve body part and a valve core part, wherein the valve body part comprises a guide part, a sealing ring, a first fluid port and a second fluid port, the valve core part comprises a valve core and a sealing part, the valve core and the sealing part can axially slide relative to the guide part, the valve core comprises a body part and an expanding part arranged below the body part, the body part and the expanding part are approximately circular, the outer diameter of the expanding part is larger than the outer diameter of the body part, the lower end of the expanding part comprises a sealing part, and the valve core part can slide relative to the inner wall of the guide part so as to enable the sealing part to be in butt joint or separation with the sealing ring;
The outer edge of the sealing component is abutted against the inner wall of the guide part; the valve core component comprises a balance flow path, when the sealing part is abutted against the sealing ring, the flow control valve comprises a first cavity positioned on the upper side of the sealing component and a second cavity arranged on the lower side of the sealing component, the second cavity is communicated with the first fluid port, and the first cavity is communicated with the second cavity through the balance flow path; when the sealing part is abutted with the sealing ring, the first cavity is not communicated with the second fluid port;
A first preset gap is arranged on the lower side of the sealing part between the valve core and the guide part; when the sealing part is abutted with the sealing ring, the sealing part comprises a sealing inner edge annular line and a sealing outer edge annular line, and a projection annular line of the outer edge of the body part in the vertical direction of the sealing ring is positioned between the sealing inner edge annular line and the sealing outer edge annular line; an inner annular surface is formed between the sealing inner edge annular line and the projection annular line, the area of the inner annular surface is S Inner part , an outer annular surface is formed between the sealing outer edge annular line and the projection annular line, the area of the outer annular surface is S Outer part , the flow area of the first preset gap is defined as S 1, and then S Outer part ＞S Inner part ,S Outer part ＞S1 is defined.
The valve core of the flow control valve comprises a body part and an expanded diameter part, wherein the outer diameter of the expanded diameter part is larger than that of the body part, the lower end of the expanded diameter part comprises a sealing part, the sealing part comprises a sealing inner edge annular line and a sealing outer edge annular line, and a projection annular line of the outer edge of the body part in the vertical direction of the sealing ring is positioned between the sealing inner edge annular line and the sealing outer edge annular line; an inner annular surface is formed between the seal inner edge annular line and the projection annular line, the area of the inner annular surface is S Inner part , an outer annular surface is formed between the seal outer edge annular line and the projection annular line, the area of the outer annular surface is S Outer part , and the flow area of the first preset gap is S 1, so that S Outer part ＞S Inner part ,S Outer part ＞S1, the invention can improve the inner leakage of the flow control valve in the valve closing state.
Drawings
FIG. 1 is a schematic view showing a structure of a first flow control valve according to the present invention in a closed state;
FIG. 2 is a schematic illustration of the construction of a spool assembly of the flow control valve of FIG. 1;
FIG. 3 is a schematic diagram showing the distribution of fluid pressure in a valve when the flow control valve is closed and the fluid is entering in the forward direction;
FIG. 4 is a schematic diagram showing analysis of fluid pressure experienced by a spool assembly when the flow control valve is closed and the fluid is entering in a forward direction;
FIG. 5 is a schematic diagram showing the distribution of fluid pressure in a valve when the flow control valve is closed and fluid is entering in reverse direction;
FIG. 6 is a schematic diagram showing analysis of fluid pressure experienced by a spool assembly when the flow control valve is closed and fluid is reversed;
FIG. 7 is a schematic diagram of the regulator of FIG. 1;
FIG. 8 is an enlarged view of a portion of the portion I of FIG. 1;
FIG. 9 is a schematic view showing the relationship between the projection loop line of the outer edge of the body portion of the valve core on the sealing ring and the inner and outer sealing edge loops of the valve core when the sealing portion of FIG. 1 is abutted against the sealing ring;
FIG. 10 is a schematic view showing a partial structure of a second flow control valve according to the present invention in a closed state;
Fig. 11 is a schematic diagram showing a modification of the seal portion of the valve element;
FIG. 12 is a partial schematic view showing the first modification of the seal ring mated with the spool;
FIG. 13 is a partial schematic view showing the second modification of the seal ring mated with the spool;
FIG. 14 is a partial schematic view showing a third modification of the seal ring mated with the spool;
fig. 15 is a schematic structural view of another flow control valve according to the present invention.
Detailed Description
In order to better understand the aspects of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description.
It should be noted here that the description is only for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of directional terms herein should not be construed to limit the scope of the application as claimed.
The term "axial direction" as used herein refers to the axial direction along the guiding portion, i.e. the O-O direction shown in fig. 1, and the term "fixed connection" as used herein may be a direct fixed connection between two parts, or may be a fixed connection between two parts through other parts, i.e. an indirect fixed connection between two parts.
FIG. 1 is a schematic view showing a structure of a first flow control valve according to the present invention in a closed state; FIG. 2 is a schematic illustration of the construction of a spool assembly of the flow control valve of FIG. 1; FIG. 3 is a schematic diagram showing the distribution of fluid pressure in a valve when the flow control valve is closed and the fluid is entering in the forward direction; FIG. 4 is a schematic diagram showing analysis of fluid pressure experienced by a spool assembly when the flow control valve is closed and the fluid is entering in a forward direction; FIG. 5 is a schematic diagram showing the distribution of fluid pressure in a valve when the flow control valve is closed and fluid is entering in reverse direction; FIG. 6 is a schematic diagram showing analysis of fluid pressure experienced by a spool assembly when the flow control valve is closed and fluid is reversed; FIG. 7 is a schematic diagram of the regulator of FIG. 1; FIG. 8 is an enlarged view of a portion of the portion I of FIG. 1; fig. 9 is a schematic diagram showing a relationship between a projection loop line of an outer edge of a body portion of the valve element on the sealing ring and a sealing inner edge loop line and a sealing outer edge loop line of the valve element when the sealing portion is abutted against the sealing ring in fig. 1.
As shown in fig. 1 and 2, the flow control valve of the present embodiment is specifically an electronic expansion valve, and includes a valve body member 10, a valve core member 30, a transmission member 40 and a motor member 50. The motor part 50 is connected to the transmission part 40, and the transmission part 40 is connected to the valve core part 30. The transmission member 40 is driven by the motor member 50 to move the valve body member 30 relative to the guide portion of the valve body member 10. Specifically, the transmission member 40 includes a screw 41 and a nut 42, and the nut 42 can drive the spool member 30 to move axially.
The valve body part 10 comprises a valve body 11, a sealing ring seat 12 with an inner hole, a sealing ring 13 and a guide piece 20, wherein the sealing ring seat 12 is formed by forging or finish turning after forging or is formed by processing a bar car. The sealing ring seat 12 is arranged in the inner cavity of the valve body 11, an annular protruding part 121 is processed on the sealing ring seat 12, the annular protruding part 121 is used as a valve opening part, and a central through hole of the annular protruding part 121 is used as a valve port. The valve body 11 is welded or in threaded connection with the sealing ring seat 12, the sealing ring 13 is installed on the sealing ring seat 12, and the sealing ring 13 is fixedly connected with the sealing ring seat 12. The valve core component 30 is abutted against or separated from the sealing ring 13, so that the sealing ring seat 12 becomes a transitional connection piece between the sealing ring 13 and the valve body 11, and a valve opening part can be formed on the sealing ring seat 12, so that the requirement on the machining precision of the valve body component is reduced. The sealing ring seat 12 and the valve body 11 are separately arranged, and it is known that the sealing ring seat 12 is a part with small volume and simple structure, and can be independently processed, is easy to process, has high precision and is convenient for mass production relative to the valve body 11. On the premise of simple process, the precision control is facilitated. The valve port with high precision requirement is not required to be processed on the valve body like the existing flow control valves.
The valve body 11 comprises a first fluid port a and a second fluid port B. The technical scheme can be applied to a one-way flow control valve and a two-way flow control valve, and particularly in the two-way flow control valve, the advantages or effects are more obvious. The term "bidirectional" means that fluid can enter either in the forward direction or in the reverse direction, and that in the valve-open state fluid can flow in from the second fluid port B and out from the first fluid port a, or in the reverse direction, fluid can flow in from the first fluid port a and out from the second fluid port B, when in the valve-open state. The guide 20 is screwed and fixed to the valve body 11, and a seal is provided therebetween to seal. The guide 20 may be integrally formed with the valve body 11 as long as the object of the present invention is achieved. One end of the guide 20 extends into the inner cavity of the valve body 11, the guide 20 comprises a guide portion 21, a valve core component 30 is arranged in the inner cavity of the valve body 11, the valve core component 30 comprises a valve core 31 and a sealing component 32, the valve core 31 and the sealing component 32 can axially slide relative to the guide portion 21, in fig. 2, the sealing component 32 is mounted on the valve core 31, and the sealing component 32 can be matched with the inner wall of the guide portion 21. Specifically, the valve element 31 includes an annular groove opening toward the inner side wall of the guide portion 21, and the seal member 32 is provided in the annular groove. The sealing member 32 includes a seal ring 321 and an elastic spacer 322. The valve element 31 includes a main body 311 and an expanded diameter portion 312 provided below the main body 311, wherein the main body 311 has substantially the same diameter as the expanded diameter portion 312 except for a portion provided with an annular groove, and the expanded diameter portion 312 has a larger outer diameter than the main body 311. The lower end of the enlarged diameter portion 312 includes a sealing portion 3121. The spool member 30 is slidable with respect to the inner wall of the guide portion 21 to bring the seal portion 3121 into contact with or separate from the seal ring 13. The inner wall of the guide 21 forms a seal with the sealing member 32 at the contact location. When the seal portion 3121 abuts against the seal ring 13, the flow control valve includes a first chamber 1 provided on the upper side of the seal member 32 and a second chamber 2 provided on the lower side of the seal member 32 and communicating with the first fluid port a, and the valve body member 30 includes a balance flow path, and when the seal portion 3121 abuts against the seal ring 13: the first cavity 1 is communicated with the second cavity 2 through a balance flow path, and the first cavity 1 is not communicated with the second fluid port B;
as shown in fig. 9, when the seal portion 3121 abuts against the seal ring 13, the seal portion 3121 includes a seal inner edge annular line N and a seal outer edge annular line P which are engaged with the seal ring 13, a projected annular line M of an outer edge of the body portion 311 in a vertical direction of the seal ring 13 is located between the seal inner edge annular line N and the seal outer edge annular line P, an inner annular surface 3121A is formed between the seal inner edge annular line N and the projected annular line M, an area is S Inner part , an outer annular surface 3121B is formed between the seal outer edge annular line P and the projected annular line M, and an area is S Outer part .
As shown in fig. 1 to 4 and 9, when the fluid flows in forward direction (i.e., flows in from the second fluid port B), the sealing portion 3121 of the enlarged diameter portion 312 abuts against the sealing ring 13, and the flow control valve is in the closed state, since the first chamber 1 is a zero pressure region, the second chamber 2 is in communication with the first chamber 1 through the balance flow path, and the inside of the second chamber 2 is also a zero pressure region. The portion of the expanded diameter portion 312 located outside the seal ring line M receives the pressure P High outside of the high-pressure fluid, and the receiving area is the area S Outer part of the outer annular surface 3121B, and generates a force F High outside ↓ acting on the seal ring 13 in the direction toward the seal ring 13. Further, since the spool member 30 axially slides with respect to the guide portion 21, a sealing portion is formed between the spool member 30 and the guide portion 21, and a first predetermined gap X located on the lower side of the sealing member 32 and a second predetermined gap Y located on the upper side of the sealing member 32 are included between the spool member 30 and the guide portion 21, in addition to the sealing portion formed between the sealing member 32 and the inner wall of the guide 20. The second predetermined gap Y is in the zero pressure area and is not affected by the fluid pressure, while the valve core member 30 is also affected by the acting force Δf ↑ of the high-pressure fluid flowing in from the second fluid port B on the sealing member 32 in the direction away from the valve port direction (upward direction), defining the flow area of the first predetermined gap X on the lower side of the sealing member 32 as S 1, Δf ↑＝P High outside ·S1, the resultant force of the fluid pressures to be applied to the valve core member 30 as F Outer part ＝F High outside ↓+△F↑ =, since both F High outside ↓ and Δf ↑ are opposite in direction, thus, F Outer part ＝P High outside ·(S Outer part －S1), in order to facilitate improvement of the sealing reliability between the spool 31 and the seal ring 13 to facilitate improvement of the internal leakage of the flow control valve, the direction of F Outer part is required to face the seal ring 13 and act on the seal ring 13, and the area S Outer part of the outer annular surface is larger than the flow area S 1 of the first predetermined gap X, that is, S Outer part ＞S1.
Fig. 5 is a schematic diagram showing the pressure distribution in fig. 1 when the fluid is reversed (the fluid enters from the first fluid port a), and fig. 6 is a schematic diagram showing the stress analysis of the valve core component when the fluid is reversed. As shown in fig. 1, 5,6 and 9, when the fluid flows in reversely (i.e., flows in from the first fluid port a), the sealing portion 3121 of the enlarged diameter portion 312 contacts the sealing ring 13, and the flow control valve is in the closed state, the first chamber 1 and the second chamber 2 are in communication with each other through the balance flow path because the second chamber 2 is in the high pressure region, and the high pressure region is also in the first chamber 1. The portion of the expanded diameter portion 312 located inside the seal ring line M receives the pressure P High inner part of the high-pressure fluid, and the receiving area is the area S Inner part of the inner annular surface 3121A, and generates a force F High inner part ↓ acting on the seal ring 13 in the direction toward the seal ring 13. Due to the presence of the second predetermined gap Y, the spool member 30 is also subjected to a force Δf ↓ in the direction of the second fluid port B flowing in to the direction of the valve port acting on the seal member 32, defining the flow area of the gap located on the upper side of the seal member 32 as S 2, Δf ↓＝P High inner part ·S2, and the resultant force of the fluid pressures to which the spool member 30 is subjected as F Inner part ＝F High inner part ↓+△F↓＝P High inner part ·S Inner part +P High inner part ·S2, since both directions of F High inner part ↓ and Δf ↓ are the same, the direction of F Inner part ＝P High inner part ·(S Inner part +S2),F Outer part is directed toward the seal ring 32 and acts on the seal ring 32, which is advantageous for improving the seal reliability between the spool 31 and the seal ring 32 to facilitate improving the internal leakage of the flow control valve.
Therefore, the flow control valve according to the present embodiment can receive the force applied by the fluid toward the sealing ring 13 to facilitate the tight contact between the valve core 31 and the sealing ring 32, so that the valve core member 30 is beneficial to the cooperation between the valve core 31 and the sealing ring 13 in the valve closing state, and the internal leakage can be improved in the forward or reverse fluid inlet state, regardless of the forward or reverse fluid inlet state.
Further, as shown in fig. 6, the second predetermined gap Y is formed between the outer edge of the main body 311 and the inner edge of the guide 21, and the projected area of the second predetermined gap Y in the vertical direction of the seal ring 13 is the flow area S 2 of the second predetermined gap Y, and S 2 and S 1 are substantially equal.
In addition, in order to make the valve core component 30 move forward and backward more smoothly under the same fluid pressure, when the fluid enters forward or backward, the valve opening force required by the valve core component 30 is not different, that is, the difference between the fluid pressure differences received by the valve core component 30 is not large, that is, F Outer part ＝F Inner part , when the design S Outer part is larger than the area of S Inner part , as described in ,F Outer part ＝P High outside ·(S Outer part －S1),F Inner part ＝F High inner part ↓+△F↑＝P High inner part ·S Inner part +P High inner part ·S2,, as P High outside ＝P High inner part =p, F Outer part ＝P·(S Outer part －S1),F Inner part ＝P·(S Inner part +S2 is adopted in the flow control valve of the present embodiment. Then, P· (S Outer part －S1)＝P·(S Inner part +S2), then S Outer part ＝S Inner part +S2+S1. That is, S Outer part is greater than S Inner part .
In addition, due to the design of the expanding portion 312 and the sealing portion 3121, the flow control valve according to the present embodiment can also adjust the size of the fluid pressure difference received by the valve core component 30 by adjusting the area difference between the inner annular surface 3121A and the outer annular surface 3121B of the valve core 31, without changing the structural dimensions of other components of the valve, which is beneficial for standardization and serialization of parts during production of the flow control valve.
Further, in order to reduce the resistance of the fluid flowing and facilitate the closing of the valve, the valve element 31 further includes a transition portion 313, one end of the transition portion 313 is connected to the body portion 311, the other end of the transition portion 313 is connected to the diameter-expanding portion 312, the outer wall of the transition portion 313 is substantially inclined, and the outer diameter of the upper end of the transition portion 313 is smaller than the outer diameter of the lower end of the transition portion 313. In order to make the valve opening forces required for the forward and reverse applications of the valve not differ much, the area S Outer part of the outer annular surface is 1.5-2.5 times the area of the inner annular surface S Inner part , so as to effectively cancel the pressure difference generated by the first predetermined gap X between the inner wall of the guide portion 21 and the spool member 30. For example, as one embodiment, the area S Outer part of the outer annular surface is 2 times the area of the inner annular surface S Inner part . I.e., S Outer part is equal to or about equal to 2S Inner part . The valve element has the advantages that the resistance of the fluid pressure received by the valve element part during valve opening can be considered under the condition of improving the internal leakage in the valve closing state in the forward direction or the reverse direction.
In a further aspect, the diameter-expanding portion 312 includes a first segment 3122 and a second segment 3123 disposed below the first segment 3122, wherein an inner wall of the first segment 3122 is substantially equal-diameter, an outer wall of the first segment 3122 is substantially equal-diameter, an inner wall of the second segment 3123 is inclined, and an inner diameter of an upper end of the inner wall of the second segment 3123 is smaller than an inner diameter of a lower end of the inner wall of the second segment 3123. So configured, fluid acts on the second segment 3123 when valve opening is desired, facilitating valve element 31 opening.
As shown in fig. 1, the outer wall of the guide member 20 is provided with an external thread, the inner wall of the valve body 11 is provided with an internal thread, the guide member 20 is fixedly connected with the valve body 11 by threads, and a sealing ring is arranged between the guide member 20 and the valve body 11 for sealing. For better guiding of the nut 42, the guide 20 comprises a guide hole 22 arranged above the guide portion 21, which guide hole 22 in this embodiment is formed in particular by an inner hole of a radially protruding part of the inner wall of the guide 20 protruding radially inwards. The outer wall of the nut 42 is in a clearance sliding fit with the inner wall of the pilot hole 22. In this way, the guide 21 can serve to connect the valve body 11 and the motor case, and can guide the valve body member 30 and the nut 42.
As shown in fig. 2, the valve body member 30 includes a nut cover 36 that mates with the nut 42, a connector 33 that is fixedly connected to the nut cover 36 and the valve body 31, the connector 33 includes a cylindrical portion 331 and a plate-like portion 332, the plate-like portion 332 includes a middle flow blocking portion 3321 and a communication passage 3322 provided outside the flow blocking portion 3321, the nut cover 36 includes a receiving chamber 361, and when the valve body 31 abuts against the seal ring 13, the balance flow passage of the flow control valve includes the second chamber 2, the communication passage 3322, and the receiving chamber 361. By providing the flow blocking portion 3321, when the valve core 31 is separated from the seal ring 13, the fluid entering from the second fluid port B may gather under the flow blocking portion 3321 to form a high pressure area, and the flow blocking portion 3321 may at least partially prevent the high pressure fluid from directly rushing into the first cavity 1 on the upper side of the seal member 32, so that the high pressure fluid is dispersed around the position of the flow blocking portion 3321, the pressure may be reduced, and the fluid after the pressure reduction enters the first cavity 1 on the upper side of the seal member 32 through the accommodating cavity 361, so that the downward fluid pressure received by the valve core member 30 may be reduced, the resistance when the valve core member 30 moves upward to open the valve may be reduced, and the valve opening reliability of the flow control valve may be improved.
As shown in fig. 3 and 8, in a further design, the valve body component 10 further includes a pressing sleeve 34, the pressing sleeve 34 is substantially annular, the pressing sleeve 34 is at least partially disposed in the inner hole of the seal ring seat 12, the pressing sleeve 34 is fixedly connected with the seal ring seat 12, the pressing sleeve 34 includes a first lower step portion 341 with a step surface facing downward, and a step surface of the first lower step portion 341 abuts against the seal ring 13. Thus, the inner edge of the seal ring 13 is pressed by the pressing sleeve, and the fixing reliability of the seal ring 13 is increased.
Fig. 7 is a schematic diagram of the regulator of fig. 1. As shown in fig. 1 and 7, the valve body 10 further includes an adjuster 35, the adjuster 35 is fixedly connected to the seal ring seat 12, and the valve element 31 is movable relative to the adjustment flow path 353 of the adjuster 35 to adjust the flow area between the first fluid port a and the second fluid port B. The valve has a flow regulating function. Further, in the further embodiment, the outer edge of the seal ring seat 12 extends upward to form an extension portion 121 (the state before the extension wall 121 is swaged is shown in fig. 1), and the bottom outer edge of the regulator 35 has an outwardly extending flange portion 352. Specifically, regulator 35 further includes an axially extending adjustment section 351, adjustment section 351 including an adjustment flow path 353, adjustment flow path 353 being embodied as a V-notch. The extension wall 121 abuts against the flange portion 352, the flange portion 352 abuts against the seal ring 13, and the regulator 35 is located outside the valve body 31 when the valve body 31 abuts against the seal ring 13. By means of the design, the extension portion 121 and the flange portion 352 can be conveniently riveted and fixed, the outer edge of the sealing ring 13 is pressed by the flange portion 352, the inner edge of the sealing ring 13 is pressed by the step surface of the pressing sleeve 34, the sealing ring 13 can be reliably attached to the sealing ring seat 12, and internal leakage performance of the valve is improved.
Fig. 8 is a partial enlarged view of the point I in fig. 1. The minimum clearance between the inner wall of the regulator 35 and the outer wall of the expanded diameter portion 312 is X 1, the minimum clearance between the outer wall of the press sleeve 34 and the inner wall of the expanded diameter portion 312 is X 2, and X 1﹤1mm,X2 is less than 1mm. When the fluid is introduced in the forward direction, the gap between the inner wall of the fluid self-regulator 35 and the outer wall of the expanded diameter portion 312 flows through the gap between the outer wall of the pressure sleeve 34 and the inner wall of the expanded diameter portion 312, which is beneficial to balancing the fluid pressure received by the valve core component 30, reducing the pressure difference received by the valve core component 30, improving the operational reliability of the flow control valve, and the fluid pressure received by the valve core component 30 can be further regulated by adjusting the sizes of X 1 and X 2. Specifically, the following design can be made: x 1﹤0.3mm,X2 < 0.3mm.
In a further scheme, as shown in fig. 3, the hole wall of the inner hole of the seal ring seat 12 includes a first stage step portion 125 and a second stage step portion 126, the bottom of the pressing sleeve 34 abuts against the first stage step portion 125, the seal ring 13 is disposed on the second stage step portion 126, and the extension wall 121 extends upward from the outer edge of the second stage step portion 126. The pair of press bushings 34 and the seal ring 13 are thereby reliably supported.
Fig. 10 is a schematic partial structure of a second flow control valve according to the present invention in a closed state.
The flow control valve of this embodiment has the same advantageous effects and other components as those of the first embodiment except that the seal ring seat structure is different from the first embodiment. Only the differences will be described below.
As shown in fig. 10, the seal ring seat 12 includes an inner liner 120', the inner liner 120' is substantially annular, a third step 122 'is included between an outer wall of the inner liner 120' and an outer edge of the seal ring seat 12', and the seal ring 13 is disposed on the third step 122'. Thus, compared with the structure of the first embodiment, in this embodiment, the "press sleeve" is reduced, the inner lining portion 120 'is directly processed on the seal ring seat 12', the number of parts is reduced, and the welding step of the press sleeve and the seal ring seat in the first embodiment is reduced.
In a further aspect, the upper end of the inner liner 120 'is higher than the upper surface of the sealing ring 13, the outer wall of the inner liner 120' includes a second lower step 1211 'with a downward step, the step of the second lower step 1211' abuts against the sealing ring 13, the sealing ring seat 12 'includes a fourth step 123' disposed between the outer wall of the inner liner 120 'and the outer edge of the sealing ring 13, the inner diameter of the fourth step 123' is larger than the inner diameter of the third step 122', and the flange 352 of the regulator 35 abuts against the step of the fourth step 123' and the sealing ring 13. In this way, compared to the case where the flange portion 352 is pressed directly against the seal ring 13 and not against the seal ring seat 12' in the first embodiment, the deformation of the seal ring 13 can be improved, and the sealing performance at the time of closing the valve can be further improved.
In the first embodiment, the seal ring seat may be deformed so that the lower end of the flange portion 352 abuts against the seal ring 13 and the seal ring seat 12, as in the second embodiment. This is also within the scope of the present invention.
In the above embodiments, the specific shape of the seal portion is not limited as long as the object of the present invention can be achieved. The specific shape of the seal 3121 may be such that the lower end surface thereof is an annular plane as shown in fig. 6, in which case the inner edge of the annular plane serves as a seal inner edge ring line and the outer edge of the annular plane serves as a seal outer edge ring line. Fig. 11 is a schematic view showing a modification of the sealing portion of the valve element, and as shown in fig. 11, the sealing portion 3121A includes a first protruding portion 1A and a second protruding portion 1B which are disposed at intervals, a side of the first protruding portion 1A close to the center line of the valve element 31 includes a sealing inner edge ring line 3121A, and a side of the second protruding portion 1B away from the center line of the valve element 31 includes a sealing outer edge ring line 3121B.
In the above embodiments, the shape of the seal ring 13 is not particularly limited, and various structures may be adopted, and fig. 12 is a partial schematic view of the first modification of the seal ring and the valve element. As shown in fig. 12, the seal ring 13a may include a recess 131A as shown in the drawing, and the seal portion 3121 of the valve element 31 extends into the recess 131A to abut against the seal ring 13, and at this time, the seal inner edge annular line 3121A and the seal outer edge annular line 3121B of the seal portion 3121 are as shown in the drawing. Fig. 13 is a partial schematic view showing the engagement of the second modification of the seal ring with the spool. As shown, the seal ring 13b may include a recess 131b in cross section as shown in the figure, and the seal portion 3121 of the valve element 31 extends into the recess 131b, and at this time, the seal inner edge ring line 3121 and the seal outer edge ring line 3121 of the seal portion 3121 abut against the recess 131 b. The recess 131a is different from the recess 131b in that, in fig. 13, the inclination angle of the inner wall of the portion of the recess 131b located outside the valve body 31 is larger than the inclination angle of the inner wall of the portion of the recess 131b located inside the valve body 31. Fig. 14 is a partial schematic view showing the engagement of the third modification of the seal ring with the valve element. As shown, the seal ring 13c may include a recess 131c as shown, and the seal portion 3121 of the spool 31 extends into the recess 131c to abut the seal ring 13c, at which time the seal inner edge ring 3121A and the seal outer edge ring 3121B of the seal portion 3121 are shown. The recess 131c is different from the recess 131b in that, in fig. 13, the inclination angle of the inner wall of the portion of the recess 131c located on the inner side of the valve body 31 is larger than the inclination angle of the inner wall of the portion of the recess 131c located on the outer side of the valve body 31.
Fig. 15 is a schematic structural view of another flow control valve according to the present invention. The flow control valve of the present embodiment is specifically a solenoid valve, and the main difference from the flow control valve of the foregoing embodiments is the difference in control components. In this solenoid valve, the control means includes a stationary core 100a and a movable core 100b. Other structures regarding the valve element, the valve seat member, and the like can be understood with reference to the foregoing embodiments.
The flow control valve provided by the present invention is described in detail above. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (15)
1. The flow control valve comprises a valve body part and a valve core part, wherein the valve body part comprises a guide part, a sealing ring, a first fluid port and a second fluid port, the valve core part comprises a valve core and a sealing part, the valve core and the sealing part can axially slide relative to the guide part, the valve core comprises a body part and an expanding part arranged below the body part, the body part and the expanding part are in a circular ring shape, the outer diameter of the expanding part is larger than that of the body part, the lower end of the expanding part comprises a sealing part, and the valve core part can slide relative to the inner wall of the guide part so as to enable the sealing part to be abutted against or separated from the sealing ring;
the outer edge of the sealing component is abutted against the inner wall of the guide part; the valve core component comprises a balance flow path, when the sealing part is abutted against the sealing ring, the flow control valve comprises a first cavity positioned on the upper side of the sealing component and a second cavity positioned on the lower side of the sealing component, the second cavity is communicated with the first fluid port, and the first cavity is communicated with the second cavity through the balance flow path; when the sealing part is abutted with the sealing ring, the first cavity is not communicated with the second fluid port;
a first preset gap is arranged on the lower side of the sealing part between the valve core and the guide part; when the sealing part is abutted with the sealing ring, the sealing part comprises a sealing inner edge annular line and a sealing outer edge annular line, and a projection annular line of the outer edge of the body part in the vertical direction of the sealing ring is positioned between the sealing inner edge annular line and the sealing outer edge annular line; an inner annular surface is formed between the sealing inner edge annular line and the projection annular line, the area of the inner annular surface is defined as S Inner part , an outer annular surface is formed between the sealing outer edge annular line and the projection annular line, the area of the outer annular surface is defined as S Outer part , the flow area of the first preset gap is defined as S 1, and then S Outer part ＞S Inner part ,S Outer part ＞ S1 is defined.
2. The flow control valve according to claim 1, wherein a second predetermined gap on an upper side of the seal member is included between the spool and the guide portion, and a flow area of the second predetermined gap is defined as S 2, then S Inner part +S1+S2≈S Outer part .
3. The flow control valve according to claim 2, wherein the second predetermined gap is formed between an outer edge of the body portion and an inner edge of the guide portion, a projected area of the second predetermined gap in a vertical direction of the seal ring is a flow area of the second predetermined gap, and S 2≈S1.
4. The flow control valve according to claim 1, wherein the valve element further comprises a transition portion, one end of the transition portion is connected to the body portion, the other end of the transition portion is connected to the diameter-expanding portion, an outer wall of the transition portion is in a slope shape, and an outer diameter of an upper end of the transition portion is smaller than an outer diameter of a lower end of the transition portion, S Outer part ＝1.5S Inner part −2.5S Inner part .
5. The flow control valve according to any one of claims 1 to 4, wherein the diameter-enlarging portion includes a first section and a second section provided below the first section, an inner wall of the first section is provided with an equal diameter, an outer wall of the first section is provided with an equal diameter, an inner wall of the second section is provided with an inclined surface, and an inner diameter of an upper end of the inner wall of the second section is smaller than an inner diameter of a lower end of the inner wall of the second section.
6. The flow control valve according to any one of claims 1-4, wherein the valve body member comprises a valve body and a guide member fixedly connected with the valve body, the lower end of the guide member extends into the inner cavity of the valve body, the guide member comprises a guide portion and a guide hole arranged above the guide portion, the flow control valve comprises a transmission member, the transmission member comprises a screw and a nut, the nut can drive the valve core member to axially move, and the outer wall of the nut can be in clearance sliding fit with the inner wall of the guide hole.
7. The flow control valve of claim 6, wherein the valve body member comprises a valve body and a seal ring seat with an inner bore, the seal ring seat is disposed in the inner cavity of the valve body, the valve body is welded or threaded with the seal ring seat, the seal ring is disposed in the seal ring seat, and the seal ring is fixedly connected with the seal ring seat.
8. The flow control valve of claim 7, wherein the flow control valve is an electronic expansion valve, the valve body member further comprising an actuator fixedly coupled to the seal ring seat, the valve spool being movable relative to an adjustment flow path of the actuator to adjust a flow area between the first fluid port and the second fluid port.
9. The flow control valve of claim 8, wherein the outer edge of the seal ring seat extends upwardly to form an extension wall, the bottom outer edge of the regulator having an outwardly extending flange portion, the regulator further comprising an axially extending adjustment segment including the adjustment flow passage, the extension wall abutting the flange portion, the flange portion abutting the seal ring, the regulator being located outside of the spool member when the spool abuts the seal ring.
10. The flow control valve of claim 9, wherein the valve body member further comprises a press sleeve, the press sleeve being annular, the press sleeve being at least partially disposed in the inner bore of the seal ring seat, the press sleeve being fixedly connected to the seal ring seat, the press sleeve including a first lower step portion having a step surface facing downward, the step surface of the first lower step portion abutting the seal ring.
11. The flow control valve of claim 10, wherein the bore wall of the bore of the seal ring seat includes a first stage step and a second stage step, the bottom of the pressure jacket abutting the first stage step, the seal ring disposed in the second stage step, the extension wall extending upwardly from an outer edge of the second stage step.
12. The flow control valve of claim 7, wherein the expanded diameter portion has an inner diameter greater than an inner diameter of the body portion, the expanded diameter portion having an inner diameter less than an outer diameter of the body portion; the valve body part further comprises a pressing sleeve and a regulator, the pressing sleeve is annular, the pressing sleeve is at least partially arranged in an inner hole of the sealing ring seat, the pressing sleeve is fixedly connected with the sealing ring seat, the regulator is fixedly connected with the sealing ring seat, and the valve core can move relative to an adjusting flow passage of the regulator so as to regulate the flow area between the first fluid port and the second fluid port; and the minimum clearance between the inner wall of the regulator and the outer wall of the diameter-expanding part is X 1, and the minimum clearance between the outer wall of the pressure sleeve and the inner wall of the diameter-expanding part is X 2, so that X 1﹤1mm,X2 is less than 1mm.
13. The flow control valve of claim 12, wherein X 1﹤0.3mm,X2 < 0.3mm.
14. The flow control valve according to claim 6, wherein the spool member further includes a nut cap fitted with the nut, a connecting member fixedly connected with the nut cap and the spool, the connecting member including a cylindrical portion and a plate-like portion including a flow blocking portion in the middle and a communication passage provided outside the flow blocking portion, the nut cap including a receiving chamber, the balance flow path including the receiving chamber.
15. The valve according to any one of claims 1-4, wherein the valve is a solenoid valve, the valve body member comprises a valve body and a guide member fixedly connected with the valve body, the lower end of the guide member extends into the inner cavity of the valve body, the guide member comprises a guide portion and a guide hole arranged above the guide portion, the solenoid valve further comprises a control member, the control member comprises a stationary core and a movable core, and the movable core can drive the valve core member to axially move.
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| CN201910890288.7A CN112539284B (en) | 2019-09-20 | 2019-09-20 | Flow control valve |
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| CN201910890288.7A CN112539284B (en) | 2019-09-20 | 2019-09-20 | Flow control valve |
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Effective date of registration: 20220810 Address after: 312500 Daming new area, Zhejiang Xinchang Economic Development Zone, Xinchang County, Shaoxing City, Zhejiang Province Applicant after: Zhejiang Sanhua Commercial Refrigeration Co.,Ltd. Address before: 312500 R & D building of Zhejiang Sanhua refrigeration group, xialiquan village, Qixing street, Xinchang County, Shaoxing City, Zhejiang Province Applicant before: ZHEJIANG SANHUA CLIMATE AND APPLIANCE CONTROLS GROUP Co.,Ltd. |
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