CN115704495A - Control valve - Google Patents

Abstract

The invention discloses a control valve, which comprises a valve body and a valve rod, wherein the control valve is provided with a valve cavity, at least part of the valve rod is positioned in the valve cavity, the valve rod is provided with a pore passage communicated with the valve cavity, the control valve is also provided with a first port, a second port and a third port, the first port, the second port and the third port are all adjacent to the valve cavity, the first port is positioned on one side of the valve cavity along the extension direction of the cavity wall of the valve cavity, the second port is closer to the first port than the third port, the first port is communicated with the pore passage, and the second port and the third port are both communicated with the valve cavity; the control valve is provided with a first working mode and a second working mode, the valve rod can move towards the direction far away from or close to the first port so as to realize the switching of the first working mode and the second working mode, in the first working mode, the first port and the second port are closed through the valve rod, the first port is communicated with the third port through a pore passage and a valve cavity, and in the second working mode, the first port is respectively communicated with the second port and the pore passage through the valve cavity; this can improve and reduce the complexity of the control valve structure.

Description

Control valve

Technical Field

The invention relates to the field of fluid control, in particular to a control valve.

Background

Generally, a valve rod of a control valve is driven by a driving element to move so as to realize the conduction or the closing of two ports, in order to realize the flow path switching between more than three ports, two valve rods and two corresponding driving elements are arranged in the control valve, and the flow path switching between a plurality of ports is realized by controlling the movement of the two valve rods, but the structure of the control valve is complex.

Disclosure of Invention

The invention aims to provide a control valve which can realize switching of a plurality of flow paths and reduce the complexity of the structure of the control valve.

The embodiment of the invention provides a control valve, which comprises a valve rod, wherein the control valve is provided with a valve cavity, at least part of the valve rod is positioned in the valve cavity, and the control valve is characterized in that the valve rod is provided with a hole passage communicated with the valve cavity, the hole passage penetrates through the valve rod, the control valve is also provided with a first port, a second port and a third port, the first port is positioned on one side of the valve cavity along the action direction of the valve rod, the second port is closer to the first port than the third port, the first port is communicated with the hole passage, and the second port and the third port are both communicated with the valve cavity;

the control valve is provided with a first working mode and a second working mode, the valve rod can move in the direction far away from or close to the first port to realize the switching between the first working mode and the second working mode, in the first working mode, the valve rod enables the first port and the second port not to be communicated, the first port is communicated with the third port through the pore passage and the valve cavity, and in the second working mode, the first port is respectively communicated with the second port and the pore passage through the valve cavity.

According to the control valve provided by the embodiment of the invention, the control valve is provided with the first port, the second port and the third port, the valve rod is provided with the pore passage communicated with the valve cavity, the control valve can be switched between the first working mode and the second working mode by moving towards the direction far away from or close to the first port, the conduction or the closing among the first port, the second port and the third port can be realized, and compared with the control valve provided with two valve rods to realize the flow path switching among a plurality of ports, the complexity of the structure of the control valve can be reduced.

Drawings

FIG. 1 is a schematic perspective view of a control valve according to an embodiment of the present invention;

FIG. 2 is an exploded view of a control valve according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional configuration of the control valve shown in FIG. 1 at one of the positions;

FIG. 4 is a schematic illustration of a portion of the control valve shown in FIG. 1;

FIG. 5 isbase:Sub>A schematic cross-sectional view taken along line A-A of FIG. 4;

FIG. 6 is a schematic illustration of the control valve shown in FIG. 1 in a first mode of operation;

FIG. 7 is a schematic illustration of the control valve shown in FIG. 1 in a second mode of operation;

FIG. 8 is a schematic illustration of the control valve shown in FIG. 1 in a third mode of operation;

FIG. 9 is a schematic structural diagram of a valve body according to an embodiment of the invention;

FIG. 10 is a schematic cross-sectional configuration of the valve body shown in FIG. 9 in one of the positions;

FIG. 11 is a schematic illustration of a valve stem provided in accordance with one embodiment of the present invention;

FIG. 12 is a schematic cross-sectional structural view of the valve stem shown in FIG. 11;

FIG. 13 is a schematic cross-sectional configuration of the valve body shown in FIG. 9 in another position;

FIG. 14 is a schematic cross-sectional configuration of the control valve shown in FIG. 1 at another location;

fig. 15 is a schematic cross-sectional view of a control valve according to another embodiment of the present invention.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Herein, relational terms such as "first" and "second", and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.

As shown in fig. 1 to 5, an embodiment of the present invention provides a control valve 1, including a valve body 10 and a valve rod 20, where the control valve 1 has a valve cavity 101, the valve body 10 forms at least part of a wall of the valve cavity 101, and at least part of the valve rod 20 is located in the valve cavity 101, optionally, the control valve 1 may further include a driving assembly 50, and the valve rod 20 can be driven by the driving assembly 50 to move so as to implement switching between multiple working medium flow paths, and the control valve 1 provided in the embodiment of the present invention may be applied to an automobile thermal management system or other fields requiring flow path switching.

Specifically, the driving assembly 50 includes a driving member, which may be a motor or a combination of a motor and a gear, as shown in fig. 2 and fig. 3, in some embodiments, the driving member includes a motor 51 and a transmission assembly 52, the motor 51 includes a stator 511 and a rotor 512, a magnetic field generated when the stator 511 is energized can drive the rotor 512 to rotate, the rotor 512 can drive the transmission assembly 52 to rotate, the transmission assembly 52 is in transmission connection with the valve stem 20, so that the transmission assembly 52 drives the valve stem 20 to move in the valve cavity 101, and in the embodiments of the present invention, the transmission assembly 52 can drive the valve stem 20 to move along the axial direction X of the control valve 1.

Referring further to fig. 1 to 5, in some embodiments, the control valve 1 further includes a first flow passage 104, at least one second flow passage 102, and at least one third flow passage 103, at least a portion of the first flow passage 104 is located on one side of the valve chamber 101 along the axial direction X, and an extending direction of at least a portion of the second flow passage 102 and an extending direction of at least a portion of the third flow passage 103 intersect with the axial direction X of the control valve 1, for example, in fig. 5, an extending direction of the second flow passage 102 and an extending direction of the third flow passage 103 are perpendicular to the axial direction X of the control valve 1. The first flow passage 104 has a first port P1 adjacent to the valve cavity 101, the second flow passage 102 has a second port P2 adjacent to the valve cavity 101, the third flow passage 103 has a third port P3 adjacent to the valve cavity 101, the first port P1 is located on one side of the valve cavity 101 along the action direction of the valve rod 20, the first port P1, the second port P2 and the third port P3 are all communicated with the valve cavity 101, the second port P2 is closer to the first port P1 than the third port P3, the valve rod 20 has a hole passage 21 communicated with the valve cavity 101, the hole passage 21 is communicated with the first port P1, at least part of the hole passage 21 can extend along the axial direction X of the control valve 1 and penetrate through the valve rod 20, in fig. 5, the hole passage 21 penetrates through both end faces of the valve rod 20, it is understood that at least part of the hole passage 21 extends along the axial direction X of the control valve 1 means that the hole passage 21 extends along the left-right direction in fig. 5, the shape of the hole passage 21 is not limited, for example, the inner wall of the hole passage 21 can be a column or a step structure, or a zigzag or a wave structure.

Referring to fig. 5 to 8, the control valve has a first operation mode and a second operation mode, the valve rod 21 can move away from or close to the first port P1 to switch the first operation mode and the second operation mode, as shown in fig. 6, in the first operation mode, the valve rod 20 can be close to the first port P1, the valve rod 20 does not communicate the first port P1 with the second port P2, the first port P1 communicates with the third port P3 through the port passage 21 and the valve chamber 101, as shown in fig. 7 and 8, in the second operation mode, the valve rod 20 can be away from the first port P1, the first port P1 communicates with the second port P2 and the port passage 21 through the valve chamber 101, respectively, and the port passage 21 can communicate with or not communicate with the third port P3. To achieve that the valve stem 20 does not communicate the first port P1 and the second port P2, alternatively, the valve stem 20 can enter or leave the first flow passage 104 through the first port P1, and when a portion of the valve stem 20 is located in the first flow passage 104 through the first port P1, a peripheral wall of the valve stem 20 may be in interference fit with a wall portion of the first port P1, so as to block the communication of the working medium between the peripheral wall of the valve stem 20 and the wall portion of the first port P1. It is understood that, in the first operation mode, the valve rod 20 may be far from the first port P1, and in the second operation mode, the valve rod 20 may be near to the first port P1, as long as the corresponding communication manner can be realized, which is not limited by the present invention.

In specific implementation, as shown in fig. 6, after the valve rod 20 enters the first flow passage 104, the outer wall of the valve rod 20 and the inner wall of the first flow passage 104 can form a sealing surface, the first port P1 communicates with the third port P3 through the orifice 21 and the valve cavity 101, and after the valve rod 20 leaves the first flow passage 104, as shown in fig. 5 and 7, the first port P1 communicates with the second port P2 through the valve cavity 101, and at least one of the first port P1 and the second port P2 communicates with the third port P3 through the valve cavity 101 and the orifice 21, as shown in fig. 8, the first port P1 communicates with the second port P2 through the valve cavity 101, and the orifice 21 and the third port P3 are closed. In the embodiment of the invention, the first port P1, the second port P2 and the third port P3 can be communicated or closed by one valve rod 20 and the pore channel 21 arranged on the valve rod 20, and compared with the method for switching the flow paths among a plurality of ports by arranging two valve rods, the embodiment of the invention can reduce the complexity of the structure of the control valve, reduce the number of parts, simplify the assembly process and reduce the manufacturing cost.

Referring to fig. 5 to 8, in some embodiments, the control valve further has a fourth flow passage 41, the fourth flow passage 41 has a fourth port P4 adjacent to the valve cavity 101, the fourth port P4 and the first port P1 are respectively disposed at two sides of the cavity wall of the valve cavity 101 in the extending direction, as shown in fig. 5, along the axial direction X of the control valve, the fourth port P4 and the first port P1 are respectively disposed at two sides of the valve cavity 101, and the fourth port P4 is communicated with the orifice 21, so that when the control valve is in the first operation mode, as shown in fig. 6, the fourth port P4 is communicated with the third port P3 through the valve cavity 101, and the second operation mode of the control valve includes a first sub-mode and a second sub-mode, as shown in fig. 7, the orifice 21 and the fourth port P4 of the valve rod 20 are both communicated with the third port P3 through the valve cavity 101, and, as shown in fig. 8, the orifice 21, the fourth port P4 and the third port P3 are all closed. Alternatively, the valve rod 20 can enter or leave the fourth flow passage 41 through the fourth port P4, and when part of the valve rod 20 is located in the fourth flow passage 41 through the fourth port P4, the peripheral wall of the valve rod 20 may be in interference fit with the wall of the fourth port P4, so as to block the working medium from flowing between the peripheral wall of the valve rod 20 and the wall of the fourth port P4.

With reference to fig. 5 to 8, the valve chamber 101 includes a first sub-chamber 111, a second sub-chamber 121 and a third sub-chamber 131, and along the extending direction of the chamber wall of the valve chamber 101, the second sub-chamber 121 is located between the first sub-chamber 111 and the third sub-chamber 131, the valve rod 20 is in spacing fit with the inner wall of the second sub-chamber 121, the first port P1 is located on one side of the first sub-chamber 111 and can be communicated with the first sub-chamber 111, the second port P2 is communicated with the first sub-chamber 111, the third port P3 is communicated with the third sub-chamber 131, and the fourth port P4 is located on one side of the third sub-chamber 131 and can be communicated with the third sub-chamber 131. In this context, the cavity wall of the valve cavity 101 extends in a direction parallel to the axial direction X of the control valve. Optionally, first subchamber 111, second subchamber 121 and third subchamber 131 may all be located on valve body 10.

Based on this, when the control valve is in the first operation mode, as shown in fig. 6, a portion of the valve rod 20 is located in the first flow passage 104 through the first port P1, the peripheral wall of the valve rod 20 is in interference fit with the wall portion of the first port P1, the first port P1 and the first subchamber 111 are closed by the valve rod 20, and the first port P1 is communicated with the third port P3 and the fourth port P4 through the orifice 21 and the third subchamber 131, respectively; in the first sub-mode, as shown in fig. 7, the first port P1 and the second port P2 are both in communication with the orifice 21 via the first subchamber 111, and the orifice 21 is in communication with the third port P3 and the fourth port P4 via the third subchamber 131, respectively; in the second sub-mode, as shown in fig. 8, the first port P1 communicates with the second port P2 through the first sub-chamber 111, and the orifice 21 and the third sub-chamber 131 are closed by the valve stem.

As shown in fig. 5 and 13, in some embodiments, the valve body 10 forms a peripheral wall of the valve cavity 101, specifically, the valve body 10 has a first cavity 11 and a second cavity 12 arranged along an axial direction X of the control valve and communicating with each other, an orthographic projection of a cavity wall of the second cavity 12 is located inside an orthographic projection of a cavity wall of the first cavity 11 along the axial direction X of the control valve, the control valve further includes a valve seat, optionally, the valve seat includes a first valve seat 30, a side wall of the first valve seat 30 is in sealed connection with a side wall of the valve body 10, as shown in fig. 5, the side wall of the first valve seat 30 is in sealed arrangement with an inner wall of the first cavity 11, the first port P1 of the first flow passage 104 is located in the first valve seat 30, an end wall of the first valve seat 30 forms one of end walls of the valve cavity 101, that is, the first cavity 11 is adjacent to a bottom wall of the second cavity 12 and forms a first sub-cavity 111, the valve, the second cavity 12 of the valve 10 forms a second sub-cavity 121, and the second port P2 penetrates through the inner wall of the first sub-cavity 111 and communicates with the first sub-cavity 111. The valve stem 20 can enter or leave the first flow passage 104 of the first valve seat 30 through the first port P1, and the wall portion of the first port P1 can be interference-fitted with the peripheral wall of the valve stem 20.

To enable the valve rod 20 to enter or leave the first flow passage 104 through the first port P1, as shown in fig. 5 to 8, 11 and 12, the valve rod 20 includes a main body section 23 and a first conical section 22, the first conical section 22 is located at one end of the main body section 23 along the axial direction X, the main body section 23 is in clearance fit with the inner side wall of the second sub-cavity 121, wherein, in a direction close to the main body section 23, the size of the first conical section 22 increases, the first conical section 22 includes a first end portion 221 and a second end portion 222, the second end portion 222 is located between the first end portion 221 and the main body section 23, and the caliber of the first port P1 is larger than the size of the first end portion 221 and smaller than the size of the second end portion 222. Alternatively, the first port P1 may be a circular port, and the first end portion 221 and the second end portion 222 are both circular in cross section perpendicular to the axial direction X, in which case the diameter of the first port P1 is larger than the diameter of the first end portion 221 and smaller than the diameter of the second end portion 222. Through the arrangement, when the valve rod 20 enters the first flow passage 104 through the first port P1, the interference fit between the outer wall of the first conical section 22 and the inner surface of the first port P1 can be realized, the sealing between the valve rod 20 and the inner wall of the first flow passage 104 is realized, and the first port P1 and the second port P2 are closed. To better achieve an interference fit of the outer wall of the first conical section 22 with the inner surface of the first port P1, the inner surface of the first port P1 is an arc-shaped surface, thereby achieving a line seal between the valve stem 20 and the inner wall of the first flow passage 104.

Referring to fig. 5 to 11, the valve seat of the control valve may further include a second valve seat 40, the second valve seat 40 is located on a side of the valve cavity 101 away from the first valve seat 30, at this time, an end wall of the second valve seat 40 forms another end wall of the valve cavity 101, a fourth port P4 of the fourth flow passage 41 is located on the second valve seat 40, at least a portion of the fourth flow passage 41 extends in the axial direction X of the control valve, the valve rod 20 can enter or leave the fourth flow passage 41 of the second valve seat 40 through the fourth port P4, at least one of the first port P1 and the second port P2 can communicate with at least one of the third port P3 and the fourth port P4 through the valve cavity 101 and the duct 21, when the valve rod 20 enters the fourth flow passage 41 through the fourth port P4, a wall portion of the fourth port P4 can be in interference fit with a circumferential side wall of the valve rod 20, at this time, an outer wall of the valve rod 20 forms a sealing surface with an inner wall of the fourth flow passage 41. The sealing form of the outer wall of the valve rod 20 and the inner wall of the fourth flow passage 41 is similar to the sealing form of the outer wall of the valve rod 20 and the inner wall of the first flow passage 104, and the description is omitted.

In order to allow the valve stem 20 to enter or leave the fourth flow passage 41 through the fourth port P4, as shown in fig. 5 to 12, the valve stem 20 further includes a second tapered section 24, the second tapered section 24 is located on a side of the main body section 23 away from the first tapered section 22, the size of the second tapered section 24 increases in a direction approaching the main body section 23, the second tapered section 24 includes a third end portion 241 and a fourth end portion 242, the fourth end portion 242 is located between the third end portion 241 and the main body section 23, the orifice 21 of the valve stem 20 penetrates through the third end portion 241 and the first end portion 221, and the caliber of the fourth port 411 is larger than the size of the third end portion 241 and smaller than the size of the fourth end portion 242. Through the above arrangement, when the valve rod 20 enters the fourth flow channel 41 through the fourth port P4, the interference fit between the outer wall of the second taper section 24 and the inner surface of the fourth port 411 can be realized, so that the sealing between the valve rod 20 and the inner wall of the fourth flow channel 41 is realized, and the pore channel 21 and the third port P3 are closed. To better achieve an interference fit of the outer wall of the second conical section 24 and the inner surface of the fourth port 411, the inner surface of the fourth port 411 is an arc-shaped surface, thereby achieving a line seal between the valve stem 20 and the inner wall of the fourth flow passage 41.

As shown in fig. 5 and 13, to realize the mounting and fixing of the second valve seat 40, the valve body 10 further has a third cavity 13, the third cavity 13 is located on one side of the second cavity 12 away from the first cavity 11, along the axial direction X of the control valve, an orthographic projection of the cavity wall of the second cavity 12 is located inside an orthographic projection of the cavity wall of the third cavity 13, at least a portion of the second valve seat 40 is located in the third cavity 13 and is disposed in a sealing manner with an inner side wall of the third cavity 13, and a second sub-cavity 131 is formed between a bottom wall of the third cavity 13 adjacent to the second cavity 12 and an end surface of the second valve seat 40, wherein the third port P3 of the control valve penetrates through an inner wall of the second sub-cavity 131.

As shown in fig. 5, in a specific implementation, to achieve the sealing arrangement of the first valve seat 30 and the inner wall of the first cavity 11, the control valve includes a first sealing ring 63, the first valve seat 30 has a mounting groove, or the valve body 10 has a mounting groove, the mounting groove extends from the inner wall of the first cavity 11 to the inside of the valve body 10, and at least a part of the first sealing ring 63 is located in the mounting groove and is clamped between the first valve seat 30 and the inner wall of the first cavity 11; for the sealing arrangement of the second valve seat 40 and the inner side wall of the third chamber 13, the control valve may further include a second sealing ring 64, the second sealing ring 64 is clamped between the second valve seat 40 and the inner side wall of the third chamber 13, and the installation form of the second sealing ring 64 is similar to that of the first sealing ring 63, and is not described again. It is understood that at least one of the first and second valve seats 30, 40 may also be welded to the valve body 10.

Further, as shown in fig. 5, the control valve further includes an end cover 105, at least a portion of the end cover 105 is located in the fourth flow passage 41 and is disposed in a sealing manner with an inner wall of the second valve seat 40; alternatively, at least a portion of the end cap 105 is positioned in the first flow passage 104 and is sealingly disposed against an inner wall of the first valve seat 30. In the embodiment of the present invention, the end cap 105 is located in the fourth flow channel 41 and blocks an external port of the fourth flow channel 41, at this time, the control valve has three flow channels, further referring to fig. 6 to 8, at this time, the control valve has three operation modes, as shown in fig. 6, in the first operation mode, a portion of the valve rod 20 enters the first flow channel 104, and the first port P1 is communicated with the third port P3 through the orifice 21, so as to achieve communication between the first flow channel 104 and the third flow channel 103; as shown in fig. 7, in the first sub-mode, the valve rod 20 is away from the first flow passage 104, the first port P1 and the second port P2 are communicated with the third port P3 through the orifice 21, and the first port P1 and the second port P2 are also communicated, so that the communication among the first flow passage 104, the second flow passage 103 and the third flow passage 103 is realized; as shown in fig. 8, in the second sub-mode, the valve rod 20 enters the fourth flow passage 41, the first port P1 communicates with the second port P2 through the valve chamber 101, so that the communication between the first flow passage 104 and the second flow passage 103 is realized, and the third port P3 is in a cut-off closed state. Through setting up end cover 105, and owing to set up pore 21 on valve rod 20, when the pressure of the working medium in the control valve is great, pore 21 can regard as balanced chamber, and the working medium that gets into from first mouth P1 passes through behind pore 21, and end cover 105 and second disk seat 40 can be to the working medium reaction force for the pressure balance of control valve reduces the influence of working medium to the motion of valve rod 20 positive direction, is convenient for drive assembly drive valve rod 20's positive reverse movement, reduces drive assembly's drive power.

With further reference to fig. 7, when the working pressure of the working medium in the control valve is high, for example, the working medium is carbon dioxide, in order to regulate the flow rate, pressure and the like of the working medium, optionally, the distance between the first valve seat 30 and the second valve seat 40 in the axial direction X is greater than the sum of the length of the valve rod 20 in the axial direction X and a preset distance, for example, the preset distance may be 2 mm, in this case, when the valve rod 20 moves to the intermediate position, the distance between the end surface of one side of the valve rod 20 and the end wall of the first valve seat 30 may be 1 mm, and the distance between the end surface of the other side of the valve rod 20 and the end wall of the second valve seat 40 may be 1 mm, so that the pressure, the flow rate and the like of the working medium in the second operation mode of the control valve are within a required range.

As shown in fig. 5 and 12, in some embodiments, when the valve stem 20 includes the first conical section 22, the main body section 23 and the second conical section 24, the main body section 23 is projected along the axial direction X of the control valve 1, the orthographic projection of the first conical section 22 is at least partially located inside the orthographic projection of the main body section 23, a first step surface S1 is formed between the first conical section 22 and the main body section 23, the first step surface S1 can abut against the bottom wall of the first valve seat 30 to limit the valve stem 20 from further moving towards the first valve seat 30, at least a part of the orthographic projection of the second conical section 24 is located inside the orthographic projection of the main body section 23, a second step surface S2 is formed between the second conical section 24 and the main body section 23, and the second step surface S2 can abut against the bottom wall of the second valve seat 40 to limit the valve stem 20 from further moving towards the second valve seat 40. With the above arrangement, the movement limit position of the valve rod 20 can be limited.

As shown in fig. 1, 3, 5 and 12, to realize the movement of the valve stem 20, in some embodiments, the main body section 23 of the valve stem 20 includes a toothed section 231, the control valve 1 further includes a driving assembly 50, the driving assembly 50 includes a motor 51 and a transmission assembly 52, at least a portion of the motor 51 is spaced apart from the valve body 10, the motor 51 can drive the transmission assembly 52 to rotate, at least a portion of the transmission assembly 52 passes through the valve body 10 to be in meshing transmission connection with the toothed section 231 of the valve stem 20, the motor 51 drives the transmission assembly 52 to rotate to drive the toothed section 231 to move in a direction close to or away from the first port P1, in the control valve provided in the embodiments of the present invention, the motor 51 drives the transmission assembly 52 to rotate to drive the toothed section 231 to move in the axial direction X of the control valve 1, and the length of the toothed section 231 is greater than the movement stroke of the valve stem 20 in the axial direction X of the control valve 1. The toothed segment 231 may be a rack or worm structure.

With further reference to fig. 5, in some embodiments, the control valve 1 further includes at least one sealing ring, the sealing ring moves synchronously with the valve rod 20, the sealing ring is disposed at an interval from the tooth-shaped section 231, and the sealing ring is interposed between the valve rod 20 and the inner sidewall of the valve body 10, in a specific implementation, the sealing ring is interposed between the valve rod 20 and the inner wall of the second sub-cavity 121, and along an extending direction of the cavity wall of the valve cavity 101, all the sealing rings are disposed between the second port P2 and the third port P3. With the above arrangement, the working medium can be prevented from flowing between the second port P2 and the third port P3 through the gap between the outer wall of the valve stem 20 and the inner side wall of the valve body 10. Optionally, the control valve 1 includes two sealing rings, namely a third sealing ring 61 and a fourth sealing ring 62, and the third sealing ring 61 and the fourth sealing ring 62 are respectively disposed at two ends of the tooth-shaped section 231; alternatively, the control valve 1 includes one sealing ring, and the sealing ring is located between the tooth-shaped section 231 and the second port P2 or between the tooth-shaped section 231 and the third port P3, and the length of the control valve in the axial direction X can be reduced by providing one sealing ring.

In order to realize the sealing between the driving assembly 50 and the valve body 10, as shown in fig. 3 and 9 to 14, in some embodiments, the valve body 10 has a mounting cavity 14, the mounting cavity 14 extends from an outer surface of the valve body 10 to an inner portion of the valve body 10, the mounting cavity 14 intersects with the valve cavity 101 at a connection port 141, the mounting cavity 14 and the valve cavity 101 are communicated through the connection port 141, the driving assembly 50 includes a base 53 and a sleeve 54, at least part of the base 53 is located in the mounting cavity 14, the sleeve 54 is located between a stator 511 and a rotor 512 of the motor, the sleeve 54 is covered on the base 53 and is in sealing arrangement with the base 53, the working medium is prevented from flowing into the stator 511 and damaging the stator 511, at least part of the transmission assembly 52 is located in the mounting cavity 14 and is in limit fit with the valve body 10, the control valve 1 further includes a sealing member 65, the sealing member 65 is sandwiched between an outer circumferential wall of the base 53 and an inner circumferential wall of the mounting cavity 14, and the sealing member 65 is located between a surface of the valve body 10 and the sealing member 65 along an extending direction of the driving assembly 50. With this arrangement, the working medium flowing through the valve chamber 102 can be prevented from flowing out of the valve body 10 through the connection port 141, and leakage of the control valve can be reduced.

With further reference to fig. 2 and 14, in some embodiments, the transmission assembly 52 includes a motor shaft 521 and a transmission shaft 522, the motor shaft 521 is in transmission connection with the rotor of the motor 51, the transmission shaft 522 is in transmission connection with the motor shaft 521, one end of the motor shaft 521 is in limit connection with the rotor of the motor 51, the other end of the motor shaft 521 is in limit fit with the valve body 10, one end of the transmission shaft 522 is in limit fit with the base 53, and the other end of the transmission shaft 522 is in limit fit with the valve body 10.

Alternatively, in fig. 2, 13 and 14, the valve body 10 has a first limit portion 15 and a second limit portion 16, the base 53 has a third limit portion 531, the motor shaft 521 includes a first mating portion 5211, the transmission shaft 522 includes a second mating portion 5221 and a third mating portion 5222, the first mating portion 5211 is nested with the first limit portion 15, the second mating portion 5221 is nested with the second limit portion 16, and the third mating portion 5222 is nested with the third limit portion 531, wherein one of the first limit portion 531 and the first mating portion 5211 is a groove structure, the other is a protrusion structure, one of the second limit portion 15 and the second mating portion 5221 is a groove structure, the other is a protrusion structure, and one of the third limit portion 16 and the third mating portion 5222 is a groove structure and the other is a protrusion structure. Through the setting, can carry on spacingly to motor shaft 521 and transmission shaft 522, realize the two steady rotation.

As shown in fig. 15, in some embodiments, the control valve 1 further has at least two second flow passages 102 and at least two third flow passages 103, the at least two second flow passages 102 are arranged along the circumferential direction of the valve body 10, and the at least two third flow passages 103 are arranged along the circumferential direction of the valve stem 20. With the above arrangement, the flow paths can be communicated among the second flow path 102, the third flow path 103, and the first flow path 104.

In summary, according to the control valve 1 provided in the embodiment of the present invention, the control valve has the first flow channel 104, the second flow channel 102, and the third flow channel 103, the first flow channel 104 has the first port P1 adjacent to the valve cavity 101, the second flow channel 102 has the second port P2 adjacent to the valve cavity 101, the third flow channel 103 has the third port P3 adjacent to the valve cavity 101, the valve rod 20 has the orifice 21 communicating with the valve cavity 101, and the control valve can be switched between the first operation mode and the second operation mode by moving the valve rod 20 in a direction close to or away from the first port P1, so as to achieve communication or closing between the first port P1, the second port P2, and the third port P3, and compared with the control valve that two valve rods are provided to achieve flow path switching between a plurality of ports, the structure of the control valve 1 can be reduced in complexity.

It should be noted that: although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the modifications, combinations, or equivalents of the present invention can be made by those skilled in the art, and all the technical solutions and modifications which do not depart from the spirit and scope of the present invention should be covered by the claims of the present invention.

Claims (11)

1. A control valve comprising a valve stem having a valve cavity with at least a portion of the valve stem located therein, wherein the valve stem has an orifice communicating with the valve cavity, the orifice extending through the valve stem, the control valve further having a first port located on one side of the valve cavity in a direction of actuation of the valve stem, a second port located closer to the first port than the third port, the first port communicating with the orifice, and a third port both communicating with the valve cavity;

the control valve has a first working mode and a second working mode, the valve rod can move towards the direction far away from or close to the first port to realize the switching of the first working mode and the second working mode, in the first working mode, the valve rod does not communicate the first port and the second port, the first port is communicated with the third port through the hole channel and the valve cavity, and in the second working mode, the first port is communicated with the second port and the hole channel through the valve cavity respectively.

2. The control valve of claim 1, further comprising a fourth port, wherein the fourth port and the first port are disposed on two sides of the valve chamber in the direction in which the chamber wall extends, and the fourth port is communicated with the port hole;

in the first working mode, the fourth port is communicated with the third port through the valve cavity, the second working mode comprises a first sub-mode and a second sub-mode, in the first sub-mode, the hole passage and the fourth port are communicated with the third port through the valve cavity, and in the second sub-mode, the hole passage and the fourth port are closed with the third port.

3. The control valve of claim 2, wherein the valve chamber comprises a first sub-chamber, a second sub-chamber and a third sub-chamber, and along the extending direction of the chamber wall of the valve chamber, the second sub-chamber is located between the first sub-chamber and the third sub-chamber, the valve rod is in limit fit with the inner wall of the second sub-chamber, the first port is located on one side of the first sub-chamber and can be communicated with the first sub-chamber, the second port is communicated with the first sub-chamber, the third port is communicated with the third sub-chamber, and the fourth port is located on one side of the third sub-chamber and can be communicated with the third sub-chamber.

4. The control valve of claim 3, wherein in the first mode of operation, the first port and the first subchamber are closed by the valve stem, the first port communicates with the third port and the fourth port through the orifice and the third subchamber, respectively, in the first sub-mode, the first port and the second port both communicate with the orifice through the first subchamber, the orifice communicates with the third port and the fourth port through the third subchamber, respectively, in the second sub-mode, the first port communicates with the second port through the first subchamber, and the orifice and the third subchamber are closed by the valve stem.

5. The control valve of claim 3, further comprising at least one sealing ring sandwiched between the valve stem and an inner wall of the second subchamber;

and in the extending direction of the cavity wall of the valve cavity, all the sealing rings are positioned between the second port and the third port.

6. A control valve according to claim 3, comprising a valve body and a first valve seat, the side walls of the first valve seat and the side walls of the valve body being sealingly connected, the side walls of the valve body forming at least part of the peripheral wall of the valve chamber, the first port being located in the first valve seat, the end wall of the first valve seat forming one of the end walls of the valve chamber, the valve stem being able to pass through the first port into or out of the first valve seat, the wall of the first port being able to be in interference fit with the peripheral wall of the valve stem.

7. The control valve of claim 6 further comprising a second valve seat, said fourth port being located in said second valve seat, an end wall of said second valve seat forming another end wall of said valve chamber, said valve stem being able to pass through said fourth port into or out of said second valve seat, a wall of said fourth port being able to have an interference fit with said valve stem circumferential sidewall.

8. The control valve of claim 7, wherein the valve stem comprises a main body section, a first cone section and a second cone section, the first cone section and the second cone section are respectively arranged at two ends of the main body section, the first cone section is close to the first opening, the second cone section is close to the fourth opening, and the main body section is in clearance fit with the side wall of the second subcavity;

the size of the first conical section increases along the direction close to the main body section, the first conical section comprises a first end part and a second end part, the second end part is positioned between the first end part and the main body section, and the caliber of the first port is larger than the size of the first end part and smaller than the size of the second end part;

the size of the second cone section increases along the direction close to the main body section, the second cone section comprises a third end part and a fourth end part, the fourth end part is positioned between the third end part and the main body section, and the caliber of the fourth opening is larger than the size of the third end part and smaller than the size of the fourth end part.

9. The control valve of claim 8, wherein at least a portion of an orthographic projection of the first cone segment and at least a portion of an orthographic projection of the second cone segment are both located inside the orthographic projection of the main body segment, as projected toward the main body segment in an axial direction of the control valve, and a first step surface is formed between the first cone segment and the main body segment, the first step surface being capable of abutting against a bottom wall of the first valve seat, a second step surface is formed between the second cone segment and the main body segment, and the second step surface being capable of abutting against a bottom wall of the second valve seat.

10. The control valve according to any one of claims 1 to 9, wherein the valve stem comprises a toothed segment, the control valve further comprises a valve body and a driving assembly, the valve body forms at least part of a peripheral wall of the valve chamber, the driving assembly comprises a motor and a transmission assembly, at least part of the motor is arranged at a distance from the valve body, at least part of the transmission assembly penetrates through the valve body and is in meshing transmission connection with the toothed segment of the valve stem, the motor drives the transmission assembly to rotate so as to drive the toothed segment to move in a direction close to or away from the first port, and the length of the toothed segment is greater than the moving stroke of the valve stem in the axial direction of the control valve.

11. The control valve of claim 10, wherein the valve body further has a mounting cavity, the mounting cavity intersects with the valve cavity at a connection port, and the mounting cavity and the valve cavity are communicated through the connection port, the driving assembly includes a base, at least a portion of the base is located in the mounting cavity, at least a portion of the driving assembly is located in the mounting cavity and is in limit fit with the valve body, and the control valve further includes a sealing member, and the sealing member is clamped between an outer peripheral wall of the base and an inner peripheral wall of the mounting cavity;

at least a portion of the sealing member is located between a surface of the valve body and the connection port in a direction of extension of the drive assembly.

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