CN112879575A

CN112879575A - Valve device

Info

Publication number: CN112879575A
Application number: CN202010046942.9A
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Current assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Priority date: 2019-11-29
Filing date: 2020-01-16
Publication date: 2021-06-01

Abstract

A valve device comprises a rotor assembly, a valve core and a transmission component, wherein the valve device is provided with a valve port, a valve core cavity, a first circulation part, a second circulation part and a balance circulation part, the balance circulation part is directly or indirectly communicated with the second circulation part and a cavity body positioned above the valve core, so that the pressures of the second circulation part and the cavity body are the same, the valve core is directly or indirectly under the action of downward pressure of a working medium in the cavity body, and the valve core is directly or indirectly under the action of upward pressure of the working medium in the second circulation part; the projection area of the stress surface of the valve core directly or indirectly acted by the upward pressure in the working medium direction on the horizontal plane is equal to the projection area of the stress surface of the valve core directly or indirectly acted by the downward pressure in the working medium direction on the horizontal plane, so that the pressure exerted on the valve core is the same and opposite in direction, the pressure difference of the valve core is balanced, the valve port is closed tightly, and the driving force required when the valve port is closed is reduced.

Description

Valve device

Technical Field

The present invention relates to a valve device.

Background

In the technical field of refrigeration/heating, the valve device is a refrigerant flow control component of refrigeration/heating equipment, and comprises a stator component, a rotor component, a valve core seat and the like, wherein the rotor component serving as a rotor is driven to rotate along with the power-on or power-off of a coil device of the stator component, the valve core is driven to move up and down by a screw rod which is fixedly connected with the rotor and rotates along with the rotor, and the flow of a refrigerant flowing through a valve port is regulated in a mode of regulating the opening degree between the valve core and the valve port, so that the system function is realized and the aim of.

When the valve port is closed by the valve core, the valve port is easy to close due to the fact that the working medium below the valve port has an upward acting force on the valve core, the valve port can be closed tightly, the valve device needs a large driving force to counteract the acting force, and particularly when the valve device flows in the reverse direction, the driving force is large.

Disclosure of Invention

The technical scheme aims to provide the valve device, which can realize the pressure balance of the upper end and the lower end of the valve core, is favorable for tightly closing the valve port and reduces the driving force required by closing the valve port by the valve device.

In order to achieve the purpose, the invention adopts the following technical scheme:

a valve device comprises a valve component and a rotor component, wherein the valve component comprises a valve core and a transmission component, the valve device is provided with a valve port, a valve core cavity, a first circulation part and a second circulation part, the first circulation part is communicated with the valve core cavity, the valve port is positioned between the first circulation part and the second circulation part, the second circulation part is communicated with the valve core cavity through the valve port, the rotor component drives the valve core to move axially through the transmission component, the valve core can move relative to the valve port to adjust the opening degree of the valve port, and the valve port and the valve core are matched to communicate the valve core cavity and the second circulation part; the valve device is also provided with a balance circulation part, at least part of the balance circulation part is positioned in the valve core, the balance circulation part is directly or indirectly communicated with the second circulation part and a cavity positioned above the valve core, the valve core is directly or indirectly acted by the downward pressure of the working medium in the cavity, and the valve core is directly or indirectly acted by the upward pressure of the working medium in the second circulation part; the projection area of the force bearing surface of the valve core directly or indirectly acted by the upward pressure in the working medium direction on the horizontal plane is equal to the projection area of the force bearing surface of the valve core directly or indirectly acted by the downward pressure in the working medium direction on the horizontal plane.

According to the valve device in the technical scheme, the second circulation part and the cavity above the valve core are directly or indirectly communicated through the balance circulation part, so that the pressures of the second circulation part and the cavity above the valve core are basically equal, the projection area of the stress surface of the valve core directly or indirectly subjected to the upward pressure in the working medium direction on the horizontal plane is equal to the projection area of the stress surface of the valve core directly or indirectly subjected to the upward pressure in the working medium direction on the horizontal plane, namely the stress areas of the pressures in the upper direction and the lower direction of the valve core are equal, and under the condition that the pressures and the stress areas are equal, the pressures applied to the valve core are equal in size and opposite in direction, so that the pressure difference of the valve core is balanced, the valve port is favorably closed, and the driving force required by closing the valve port is reduced.

Drawings

FIG. 1 is an angular schematic view of an embodiment of a valve device;

FIG. 2 is a schematic cross-sectional view of FIG. 1;

FIG. 3 is a schematic cross-sectional view of the valve member, rotor assembly and sleeve combination of FIG. 2;

FIG. 4 is an enlarged, fragmentary, cross-sectional view of the valve assembly of FIG. 2;

FIG. 5 is a cross-sectional structural view of the valve seat of FIG. 2;

FIG. 6 is a schematic perspective view of the valve cartridge seat of FIG. 2;

FIG. 7 is a schematic cross-sectional view of the guide member of FIG. 2;

FIG. 8 is a cross-sectional structural view of the nut socket of FIG. 2;

FIG. 9 is a schematic cross-sectional view of the valve assembly of FIG. 2 in a fully open condition;

FIG. 10 is an enlarged, fragmentary, cross-sectional schematic view of a second embodiment of the valve assembly;

FIG. 11 is an enlarged, fragmentary, cross-sectional schematic view of a third embodiment of the valve assembly;

FIG. 12 is an enlarged cross-sectional structural view of the first and second seals of FIG. 2;

FIG. 13 is an enlarged cross-sectional structural view of yet another embodiment of the first and second seals;

FIG. 14 is an enlarged cross-sectional structural view of yet another embodiment of the first and second seals;

FIG. 15 is another enlarged, fragmentary, cross-sectional structural view of the valve assembly of FIG. 2;

FIG. 16 is a schematic cross-sectional view of a fourth embodiment of a valve assembly;

FIG. 17 is a schematic cross-sectional view of a fifth embodiment of a valve assembly;

FIG. 18 is a schematic cross-sectional view of a sixth embodiment of a valve device;

FIG. 19 is a schematic cross-sectional view of a seventh embodiment of a valve device;

FIG. 20 is a cross-sectional structural schematic view of an embodiment of a combination valve;

FIG. 21 is an enlarged, fragmentary cross-sectional structural schematic of the valve cartridge of FIG. 20;

fig. 22 is a perspective view of the first check valve of fig. 20.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments, wherein the words representing orientations such as upper, lower, left, right, top, bottom, etc. in the detailed description are used in conjunction with the accompanying drawings 1-22 for convenience in describing the technical solutions of the present invention, and should not be construed as limiting the scope of the present invention:

referring to fig. 1-9, the valve device can be applied to an air conditioning system for flow adjustment and on-off control of the system, and is particularly suitable for an automobile air conditioning system. The valve device 10 includes a stator assembly 11, a rotor assembly 12, a valve member 13, a valve seat 14, and a circuit board 15. The valve member 13 includes a spool seat assembly 13A, a spool assembly 13B, the spool seat assembly 13A includes a spool seat 131, and the spool assembly 13B includes a spool 132; the valve seat 14 is used for placing or accommodating a valve component, in this embodiment, the valve seat 14 has a first flow-through portion 141 and a second flow-through portion 142 for flowing in or flowing out a working medium, the valve device has a valve port 1311, the valve port 1311 is located between the first flow-through portion 141 and the second flow-through portion 142, in this embodiment, the valve port 1311 is located in the valve core seat 131, and the valve port 1311 is engaged with the valve core 132 to enable the first flow-through portion 141 and the second flow-through portion 142 to be communicated or blocked. Of course, the first and

second flow paths

141 and 142 may be located not on a valve seat but on a system component connected to the valve seat, and the valve seat supports the valve component.

The valve assembly 10 further includes a sleeve 123, the stator assembly 11 is disposed at an outer periphery of the rotor assembly 12, and the sleeve 123 is disposed between the stator assembly 11 and the rotor assembly 12 to isolate the stator assembly 11 from the rotor assembly 12. The stator assembly 11 is electrically and/or signal connected to the circuit board 15; when the valve device 10 works, the current in the windings passing through the stator assembly 11 is controlled to change according to a preset rule, so that the stator assembly 11 is controlled to generate a changing excitation magnetic field, the rotor assembly 12 rotates under the action of the excitation magnetic field, and the rotor assembly 12 can drive the valve core 132 to move relative to the valve port 1311 and adjust the opening degree of the valve port 1311; therefore, the rotor assembly can drive the valve core to move relative to the valve port through the external driving force. In this embodiment, the valve port is disposed on the valve core seat, and as another embodiment, the valve port may be directly disposed on the valve seat, so that the valve core seat is omitted.

In this embodiment, the stator assembly 11 is fixedly connected to the valve seat 14, and specifically, the valve device further includes a pressure plate 16, the stator assembly 11 is fixedly connected to the valve seat 14 through the pressure plate 16, a cross-sectional shape of the pressure plate 16 is substantially L-shaped, one portion of the pressure plate 16 is fixedly connected to the stator assembly 11, and the other portion of the pressure plate 16 is fixedly connected to the valve seat 14 through a screw 17.

Referring to fig. 2 and 3, the valve core assembly 13A further includes a connecting member 135, a guide member 136, the valve core assembly 13B further includes a sleeve portion 137, the valve member 13 further includes a transmission member, which in this embodiment includes a lead screw 133, a nut seat 134, and the rotor assembly 12 includes a permanent magnet 121 and a connecting plate 122. The permanent magnet 121 is fixedly connected with the connecting plate 122, one end of the lead screw 133 is fixedly connected with the connecting plate 122, the lead screw 133 is fixedly connected with the rotor assembly 12 through the connecting plate 122, specifically, the lead screw 133 and the connecting plate 122 can be fixed by welding, and the rotor assembly 12 can be integrally formed, for example, the permanent magnet 121 is directly injection-molded on the connecting plate 122. In this embodiment, the nut seat 134 is fixedly connected to the connecting member 135, the permanent magnet 121 rotates to drive the connecting plate 122 and the lead screw 133 to rotate, the lead screw 133 is in threaded fit with the nut seat 134, the valve core 132 is directly or indirectly connected to the lead screw 133, the valve core 132 moves along the axial direction of the lead screw 133, and the guiding member 136 is in fit with the outer side of the valve core 132 to guide the axial movement of the valve core 132. Of course, the transmission component is not limited to the nut seat and the screw rod, and other structures capable of achieving the same function can be adopted.

Referring to fig. 8, the nut seat 134 has a first mounting hole 1341 and a third cavity C3, the first mounting hole 1341 is disposed to communicate with the third cavity C3, and a portion of a sidewall forming the first mounting hole 1341 has an internal thread segment 1341 a. The other end of the screw 133 extends into the third chamber C3 through the first mounting hole 1341 and is connected to the valve element 132 through the sleeve portion 137. The outer peripheral wall of the screw 133 is provided with an outer thread section 1331 matched with the inner thread section 1341a, when the stator assembly 11 generates an excitation magnetic field, the rotor assembly 12 drives the screw 133 to rotate together under the action of the excitation magnetic field, meanwhile, the screw 133 and the nut seat 134 are matched through threads, the valve core 132 can be driven to move along the axial direction, the valve core 132 changes the flow cross-sectional area of the working medium at the valve port by being close to and far from the valve port 1311, and further throttling and/or on-off of the working medium can be formed at the valve port, the cross-sectional structure schematic diagram of a valve device in a fully-closed state of the valve port is shown in fig. 2, and the cross-sectional structure schematic diagram of a valve device.

Referring to fig. 3, the sleeve portion 137 has a generally cylindrical outer shape, and the sleeve portion 137 has a first cavity C1, which may be C1 for accommodating components. The valve member 13 includes a first position-limiting portion 1371, the sleeve portion 137 has an open end, a portion of the first position-limiting portion 1371 extends into the first cavity C1 through the open end, the sleeve portion 137 is fixedly connected to the first position-limiting portion 1371, and the first position-limiting portion 1371 has a first position-limiting surface 1371 a. One end of the screw 133, which is far away from the connecting plate 122, has a stepped portion, the valve component further includes a second limiting portion 1332, the second limiting portion 1332 abuts against the stepped portion and is fixedly connected with the screw 133, the second limiting portion 1332 has a second limiting surface 1332a, and the first limiting surface 1371a abuts against the second limiting surface 1332a, so that the sleeve portion 137 cannot be separated from the screw 133. During assembly, the second position-limiting portion 1332 may be first fixedly connected to the screw 133 and then placed in the first cavity C1 of the sleeve portion 137, and then the first position-limiting portion 1371 and the sleeve portion 137 may be fixed by welding or the like. After assembly, the lower end of the screw 133 is retained in the first cavity C1 of the sleeve portion 137, the first retaining surface 1371a and the second retaining surface 1332a are disposed to face each other, and the first retaining surface 1371a and the second retaining surface 1332a are disposed to be inclined downward from one end close to the axis to one end away from the axis. The bottom end of the sleeve portion 137 and the top end of the valve element 132 are mutually restricted, and may be restricted or fixed by welding, injection fixing, fitting, or the like. When the screw 133 moves axially upward, the first limit portion 1371 and the second limit portion 1332 limit each other, and the lower sleeve portion 137 and the valve core 132 move axially along with the screw 133 when the first limit surface 1371a and the second limit surface 1332a are matched.

The valve member further includes a spring 138, a support member 139 and a first shim 1372, the spring 138, the support member 139 and the first shim 1372 are located in the first cavity C1, the upper end of the spring 138 contacts with the second limiting portion 1332 and is limited by the second limiting portion 1332, the lower end of the spring 138 is supported by the support member 139, the lower surface of the support member 139 abuts against the first shim 1372, and the first shim 1372 is located at the bottom of the first cavity C1. The screw 133 and the valve core assembly 13B are flexibly connected through the spring 138, when the screw 133 moves axially downwards, the position deviation caused by part processing or assembly can be adjusted in time, the valve core assembly is prevented from being in hard contact with other parts as much as possible, and the occurrence of the clamping phenomenon is reduced; in addition, the friction between parts is reduced, the abrasion is reduced, and the service life of the valve device is prolonged.

Referring to fig. 5, the valve seat 14 includes a first flow portion 141, a second flow portion 142, a first port i, and a second port ii, where the first port i and the second port ii are located on different sides of the valve seat 14, respectively, which is beneficial to avoiding installation interference when the valve device is connected to a system, and improving the utilization rate of the valve seat, and as another embodiment, the first port i and the second port ii may also be located on the same side of the valve seat 14. The first port i communicates with the first circulation portion 141, and the second port ii communicates with the second circulation portion 142. The valve seat 14 further has a mounting cavity 143, the mounting cavity 143 having a first mounting portion 1431 and a second mounting portion 1432, the valve seat 14 further has a platform 144, the platform 144 is a portion of a sidewall forming the mounting cavity 143, the mounting cavity above the platform 144 is defined as the first mounting portion 1431, the mounting cavity below the platform 144 is defined as the second mounting portion 1432, and an inner diameter of the sidewall forming the first mounting portion 1431 is larger than an inner diameter of the sidewall forming the second mounting portion 1432. The valve member is at least partially located in the mounting cavity 143. The first and second flow-through

portions

141 and 143 communicate with each other.

Referring to fig. 2, 3 and 6, the valve plug seat 131 includes a first fitting portion 1312, a communicating portion 1313 and a valve port 1311, the first fitting portion 1312 is located at an upper end of the valve plug seat 131, the communicating portion 1313 has at least one second through hole 1313a, and in this embodiment, 4 second through holes are specifically provided and evenly distributed along an axial direction of the communicating portion, so as to facilitate circulation of a working medium. The valve core seat 131 further has a valve core cavity Cx, the second through hole 1313a is communicated with the valve core cavity Cx, the valve core cavity Cx is communicated with the valve port 1311, the valve core seat 131 is located on the second mounting portion 1432 of the valve seat 14, the first through part 141 is communicated with the valve core cavity Cx through the second through hole 1313a, the second through part 142 is communicated with the valve core cavity Cx when the valve port 1311 is opened, and the second through part 142 is not communicated with the valve core cavity Cx when the valve port 1311 is closed. The working medium can flow in the forward direction, flows through the first circulation portion 141 from the first port I, enters the spool cavity Cx through the second through hole 1313a, and then flows to the valve port 1311, the valve port 1311 and the second circulation portion 142 can be selectively communicated through position adjustment of the spool 132, flows through the second circulation portion 142 through the valve port 1311, and flows out from the second port II; the working medium can also flow in the reverse direction, flowing from the second port ii through the second flow-through portion 142, through the valve port 1311, the spool chamber Cx, the second through hole 1313a, through the first flow-through portion 141, and out of the first port i.

Referring to fig. 7, the guide member 136 has a connecting portion 1361 and a second fitting portion 1362, the second fitting portion 1362 is located below the connecting portion 1361, the second fitting portion 1362 and the first fitting portion 1312 of the valve core seat 131 are in press-fit interference fit, so that the valve core seat 131 and the guide member 136 are relatively fixed, and the interference fit of the guide member and the valve core seat also achieves the relative fixing of the valve core seat 131 and the valve seat 14. The interior of the guide member 136 is provided with a cartridge assembly guide, which includes a sleeve guide 1363, a cartridge guide 1364. The inner diameter of the spool guide 1364 matches the outer diameter of the spool 132, so that at least part of the outer edge surface of the spool 132 can freely move for a certain stroke along the spool guide 1364, and the spool guide 1364 provides good guidance and radial support for the spool 132, thereby preventing abnormal wear of the valve port caused by the swing of the spool. Similarly, the inner diameter of the sleeve guide 1363 matches the outer diameter of the sleeve portion 137, so that at least a portion of the outer edge surface of the sleeve portion 137 can freely move along the sleeve guide 1363 for a certain stroke, the sleeve guide 1363 provides good guidance and radial support for the sleeve portion 137, and abnormal swinging of the screw rod due to swinging of the sleeve portion is prevented, and abnormal abrasion of the threaded portion and operation noise caused by swinging of the rotor assembly are prevented. Since the outer diameter of the sleeve portion 137 is smaller than the outer diameter of the spool 132 in the present embodiment, the inner diameter of the sleeve guide portion 1363 is smaller than the inner diameter of the spool guide portion 1364, as another embodiment, the outer diameter of the sleeve portion 137 may be greater than or equal to the outer diameter of the spool 132, and correspondingly, the inner diameter of the sleeve guide portion 1363 is greater than or equal to the inner diameter of the spool guide portion 1364. Of course, the guide member and the valve core seat may be integrally formed, so that the first fitting portion and the second fitting portion are integrally formed. The guide member further has a step 1366 and a second chamber C2, the step 1366 is located between the cartridge guide 1364 and the sleeve guide 1363 for connection, and the second chamber C2 is located between the upper end surface of the cartridge and the step 1366.

Referring to fig. 2, 4 and 5 in combination, the connecting member 135 has a first flange portion 1351, the first flange portion 1351 is located in the first mounting portion 1431 of the valve seat, a lower surface of the first flange portion 1351 abuts against the platform 144, the compression nut 18 is sleeved on a radial outer periphery of the side wall of the main body of the connecting member 135, the compression nut 18 contacts an upper surface of the first flange portion 1351, and the compression nut 18 is screwed with the valve seat 14, so that the connecting member 135 is fixedly connected with the valve seat 14. In addition, the connecting member 135 is fixedly connected to the nut seat 134, specifically, the upper end of the connecting member is fixedly connected to the nut seat 134 by laser welding through the supporting member 1352 or the connecting member is directly welded to the nut seat. The bottom of the connecting member 135 is interference-fitted with the connecting portion 1361 of the guide member, and can be fixedly connected by furnace welding or the like. The end of the sleeve 123 is retained by the connector 135. The upper end of the guide member 136 is at least partially disposed within the third cavity C3 of the nut seat, and the guide member 136 is a clearance fit with the nut seat 134. In this embodiment, the connecting member 135, the guiding member 136, and the valve core seat 131 in the valve core seat assembly 13A are in a split structure, which facilitates the processing of the valve core seat, the assembly with the valve core assembly, and the connection with the valve seat, and the sleeve portion 137 and the valve core 132 in the valve core assembly 13B are also in a split structure, which facilitates the processing of the balance hole and the assembly of other components, such as the spring 138 and the supporting member 139.

The opening and closing of the valve port 1311 in the valve apparatus is achieved by the up-and-down movement of the spool 132, which requires a certain movement space, and thus, the second chamber C2 is provided inside the guide member 136. Since the valve core assembly 13B of the present embodiment is a separate structure, and includes the valve core 132 and the sleeve portion 137, the valve core 132 moves up and down by the sleeve portion 137, and therefore, a certain space, that is, the third cavity C3 of the nut seat, inevitably exists between the sleeve portion 137 and the nut seat 134. The space between the outer wall of the nut seat 134 and the rotor assembly 12 is designated as a fourth cavity C4.

In the working process of the valve device, the first port i can be used as a working medium inlet, and correspondingly the second port ii is used as a working medium outlet, when the valve port 1311 is closed, the first circulation portion 141 and the valve core cavity Cx are filled with high-temperature and high-pressure working media, the first circulation portion 141 and the valve core cavity Cx are high-pressure regions, and correspondingly the second circulation portion 142 isolated by the valve core 132 is a low-pressure region; conversely, the first port i may also be used as a working medium outlet, and correspondingly, the second port ii is used as a working medium inlet, when the valve port 1311 is closed, the high-temperature and high-pressure working medium fills the second flow-through portion 142 located below the valve port, the second flow-through portion 142 is a high-pressure region, and the first flow-through portion 141 and the spool chamber Cx are low-pressure regions. When the valve port 1311 is closed, the lower end of the valve element 132 is acted on by the working medium, and an upward pressure acts on the valve element, and particularly when the working medium enters from the second port ii, the pressure acting on the valve element 132 is larger, and the valve port is not easily closed by the valve element, so that a larger driving force is required to overcome the pressure to enable the valve element to abut against the valve port and close the valve port.

In order to close the valve port with a small driving force, referring to fig. 4, in the present embodiment, the valve body 132 has a first balance hole 1321 formed in an axial direction, the first balance hole 1321 penetrates both ends of the valve body 132, the sleeve portion 137 also has a second balance hole 1373 formed in an axial direction, the first shim 1372 has a fourth balance hole 1372a, and the support member 139 has a third balance hole 1391, and when the valve members are assembled as shown in fig. 2, the first balance hole 1321, the second balance hole 1373, the third balance hole 1391, and the fourth balance hole 1372a communicate with each other, and the first balance hole 1321, the second balance hole 1373, the third balance hole 1391, and the fourth balance hole 1372a directly communicate the second communicating portion 142 with the first chamber C1 as a part of the balance communicating portion. In the present embodiment, the first balance hole 1321, the second balance hole 1373, the third balance hole 1391, and the fourth balance hole 1372a have the same hole diameter, and the support member 139, the first shim 1372, the sleeve portion 137, and the spool 132 are coaxially disposed, but the second balance hole 1373, the third balance hole 1391, and the fourth balance hole 1372a may have different hole diameters from the first balance hole 1321. The balance hole is not arranged on the transmission part in the embodiment, so that the strength of the transmission part is ensured, the transmission part does not need to be additionally processed, and the cost is reduced.

The valve device also has a first sealing member 191 and a second sealing member 192, the first sealing member 191 is positioned between the valve core seat 131 and the valve core 132, when the valve port 1311 is closed, the first sealing member 191 prevents the working medium in the valve core cavity Cx from entering the second flow-through part 142 through the gap between the valve core seat 131 and the valve core 132; the second seal 192 is located above the first and second flow-through portions, specifically, the second seal 192 is located between the outer side wall of the spool 132 and the spool guide 1364 of the guide member 136, the second seal 192 separates the cavity above the second seal (including the second chamber C2, the first chamber C1, the third chamber C3, the fourth chamber C4, and the like) from the spool chamber Cx, and prevents the working medium in the spool chamber Cx from entering the cavity above the second seal through a gap between the outer side wall of the spool 132 and the spool guide 1364 of the guide member 136.

In the embodiment, the balance flow portion includes the first balance hole 1321, the second balance hole 1373, the fourth balance hole 1372a, and the third balance hole 1391, and further includes the first cavity C1, a gap between the sleeve portion and the screw rod, that is, a gap between the sleeve portion and the first stopper portion, and a gap between the guide member and the sleeve portion, and due to the existence of the balance flow portion, the second flow portion 142 and the second cavity C2 are communicated, that is, the working medium may enter the first cavity C1 through the first balance hole 1321, the second balance hole 1373, the fourth balance hole 1372a, and the third balance hole 1391, and enter the third cavity C3 through the gap between the sleeve portion and the first stopper portion, and enter the second cavity C2 through the gap between the guide member and the sleeve portion, and due to a certain fit gap also existing between the screw rod and the nut seat, the working medium may also flow into the fourth cavity C3 from the third cavity C3. When the working medium enters from the first circulation portion 141, the spool chamber Cx is a high pressure region, and due to the communication function of the balance circulation portion, the chambers above the second seal (including the second chamber C2, the first chamber C1, the third chamber C3, the fourth chamber C4, and the like) and the second circulation portion 142 are low pressure regions, whereas when the working medium enters from the second circulation portion 142, the second chamber C2, the first chamber C1, the third chamber C3, the fourth chamber C4, and the second circulation portion 142 are high pressure regions, and the spool chamber Cx is a low pressure region, and the first seal and the second seal play a role in separating the high pressure region from the low pressure region, so that the high-pressure working medium and the low-pressure working medium are prevented from being mixed. When the valve port 1311 is closed, the working medium can flow from the second flow portion 142 through the balance flow portion into the first chamber C1, the second chamber C2, and the third chamber C3, the pressure in the second flow portion 142 is substantially equal to the pressure in the first chamber C1, the second chamber C2, and the third chamber C3 by the balance flow portion, the working medium in the second chamber C2 directly contacts with the upper end surface of the valve element to generate a downward pressure on the upper end surface of the valve element, the first chamber C1, the third chamber C3, the fourth chamber C4, and the like do not directly contact with the valve element, so that a downward pressure is generated on the valve element by indirectly acting on the upper end surface of the valve element, the lower end of the valve element is acted on the upward pressure generated by the working medium in the second flow portion, the valve element can be closed by a small driving force in order to balance the pressure generated by the working medium at the upper and lower ends of the valve element 132, and the valve element can be closed directly or indirectly acted on the projection of the plane of the pressure acting on the pressure acting in the direction of the valve element in The projection areas of the stress surfaces which receive the action of the upward pressure in the working medium direction on the horizontal plane are equal, which means that the stress areas of the valve core which receive the action of the upward and downward pressures of the working medium are equal, and according to the pressure, the pressure and the stress areas are the same, so the pressures acting on the valve core are the same, and the directions are opposite. The projected areas as described herein are equal to allow for a range of errors, such as within 6.5% of the area error, to be considered equal.

In order to realize that the projection area of the force-bearing surface of the valve core directly or indirectly acted by the upward pressure in the working medium direction on the horizontal plane is equal to the projection area of the force-bearing surface of the valve core directly or indirectly acted by the upward pressure in the working medium direction on the horizontal plane, the area of the projection of the upper end of the valve core on the horizontal plane, which falls into the projection of the sealing surface of the second sealing element and the valve core on the horizontal plane, is limited to be equal to the area of the projection of the lower end of the valve core on the horizontal plane, which falls into the projection of the sealing surface of the first sealing element on. The first sealing element is positioned at the lower end of the valve core, a sealing surface is arranged between the first sealing element and the valve core, the part which is equivalent to the horizontal projection of the lower end of the valve core and positioned in the sealing surface is acted by upward pressure in the working medium direction, the area of the horizontal projection can be obtained by calculation according to the valve core diameter R1 at the matching position of the valve core and the first sealing element and the aperture of a first balance hole (the area of the valve core is calculated without the balance hole according to the valve core diameter R1, the aperture area is calculated according to the aperture of the first balance hole, the difference between the area of the valve core and the aperture area is the area of the horizontal projection), the second sealing element is positioned at the upper end of the valve core, a sealing surface is also arranged between the second sealing element and the valve core, the part which is equivalent to the horizontal projection of the upper end of the valve core and positioned in the sealing surface is acted by downward pressure in the, under the condition that the diameters of the valve cores R1 and R2 are equal and the apertures of the first balance holes are the same, namely the projection area of the force bearing surface of the valve core directly or indirectly acted by the upward pressure in the working medium direction on the horizontal plane is equal to the projection area of the force bearing surface of the valve core directly or indirectly acted by the upward pressure in the working medium direction on the horizontal plane. In this embodiment, the valve element has a recess portion, the recess portion is located in the valve element cavity, and the working medium in the valve element cavity can also generate upward or downward pressure on the valve element.

In addition, in the process that the valve element 132 lifts upwards to gradually open the valve port 1311, the working medium in the first chamber C1 can enter the second flow-through part 142 through the balance flow-through part, the working medium in the second chamber C2, the third chamber C3, the fourth chamber C4 and other cavities and gaps can also flow into the first chamber C1 through the matching gaps, and then flow into the second flow-through part 142 through the balance flow-through part, so that the valve element can move upwards in a short time, and the opening speed of the valve port is increased.

As a second embodiment of the valve device, the first balance hole located in the valve body 132 may be divided into two flow paths, three or four flow paths, or the like from one hole of the first embodiment as shown in fig. 10, and the first balance hole 1321 'may directly communicate with the second flow passage portion 142 and the second chamber C2, and therefore, the balance hole may or may not be provided in the sleeve portion, the first shim, and the support member, and the balance flow portion may include the first balance hole 1321', the second chamber C2, a gap between the guide member and the sleeve portion, and a gap between the sleeve portion and the first stopper portion, and communicate with the second chamber, the third chamber, and the first chamber through the balance flow portion. In order to achieve pressure balance between the upper end and the lower end of the valve element, the hole area of the first balance hole 1321 'on the lower end surface of the valve element is equal to the total hole area of the first balance hole 1321' on the upper end surface of the valve element, except for the first embodiment.

As a third embodiment of the valve device, on the basis of the valve device of the first embodiment, a plurality of first through holes 1374 extending in the radial direction are provided on the sidewall of the sleeve portion 137, the first through holes 1374 communicate with the second balance holes 1373 extending in the axial direction, when the valve port is closed, the first through holes 1374 are located in the spool guide portion 1364, the height of the first through holes 1374 is higher than the height of the upper end surface of the spool, the first through holes also serve as a part of the balance flow portion to communicate the second chamber C2 with the second flow portion, referring to fig. 11, when the spool 132 moves, the working medium in the second chamber C2 may communicate with the second flow portion 142 through the first through holes 1374, the second balance holes, the first balance holes, and the second balance holes, or may communicate with the first chamber C1, the third balance holes, the fourth balance holes, the first balance holes, and the second flow portion 142 through fitting gaps to increase the flow path. It is understood that the third balance hole and the fourth balance hole may not be provided in the present embodiment, the second balance hole does not need to communicate with the first chamber, the working medium in the second chamber C2 may communicate with the second circulation portion 142 through the first through hole 1374, the second balance hole 1373 and the first balance hole 1321, the working medium in the second chamber C2 may also communicate with the third chamber C3 through the gap between the guide member 136 and the sleeve portion 137, and communicate with the first chamber C1 through the gap between the sleeve portion 137 and the lead screw 133. In addition, the upper end portion of the sleeve portion 137 may also be provided with a through hole radially communicating with the second balance hole 1373, and a fit clearance between the sleeve portion 137 and the screw 133 may be as large as possible within an allowable range, so that the working medium of the third cavity C3 and the fourth cavity C4 flows more smoothly.

One embodiment of a first seal is shown in fig. 12. The valve core 132 includes a valve core connecting portion 1322 and a valve core extending portion 1323, the diameter of the valve core extending portion 1323 is smaller than the diameter of the valve port 1311, and the diameter of at least a part of the valve core connecting portion 1322 is larger than the diameter of the valve port 1311. When the valve port 1311 is closed, the spool insertion portion 1323 is located below the valve port 1311, and the end of the spool connection portion 1322 that is located above the valve port 1322 and that is close to the valve port has an annular projection 1324 that extends in the axial direction, that is, in the direction of the valve port, and the projection 1324 is located above the valve port. The valve core seat 131 is provided with a first mounting groove 1314, the first mounting groove 1314 is positioned at the periphery of the valve port 1311, and the first sealing element 191 is positioned in the first mounting groove 1314. As shown in fig. 12, when the valve port 1311 is closed, the protrusion 1325 abuts against the first seal 191, and can prevent the spool chamber from communicating with a space communicated with the lower end of the spool through a gap between the spool seat and the spool, and the space communicated with the lower end of the spool communicates with the second communication portion; the first sealing element is positioned on the outer side of the valve core extending part and is spaced from the valve core extending part by a certain distance. The first sealing element 191 can be made of a common plastic material, in this embodiment, Polytetrafluoroethylene (PTFE) is used, the PTFE has hardness and elasticity, and the first sealing element 191 made of PTFE can be matched with the protrusion 1325 to achieve a good sealing effect. In another embodiment, the first sealing member may be made of a mixture of ptfe and another material or another material having both hardness and elasticity. The first sealing element and the bulge are matched to form an axial sealing structure, the first sealing element is stressed in the axial direction and generates axial deformation, the axial sealing structure does not influence the up-and-down movement of the valve core, and the sealing performance is good. The protrusions in this embodiment are protrusions with radian, and protrusions with edges or a plane at the bottom end can also be adopted as the protrusions in other embodiments. The valve core diameter R1 of the valve core at the position where the valve core cooperates with the first sealing element 191 can be calculated by taking two sealing points which are located on the same horizontal plane and the valve core cooperates with the first sealing element, wherein a connecting line between the two sealing points and the axis of the valve core have an intersection point, and the distance between the two sealing points is the valve core diameter R1, if a plurality of sealing points which meet the above requirements exist in the vertical direction or the horizontal direction, the distance between the center points of the sealing points is the valve core diameter R1, the valve core diameter R1 of the embodiment is shown in fig. 12, and the distance between the center points of the two protrusions 1325 is the valve core diameter R1.

As another embodiment of the first seal, as shown in fig. 13, unlike the previous embodiment, the first seal 191 'is located on the spool 132' and the protrusion 1315 'is located on the spool seat 131'. Specifically, the valve core 132 ' has a groove, the groove is opened towards the valve port, the first sealing element 191 ' is positioned in the groove and limited by groove walls forming the groove, the valve port periphery has a projection 1315 ' extending upwards along the axial direction, and when the valve port is closed by the valve core, the projection 1315 ' abuts against the first sealing element 191 '.

Sealing washer or sealed the pad can be chooseed for use to first sealing member, and the contact site of arch and first sealing member is close to the middle part of first sealing member in above-mentioned two embodiments, is favorable to strengthening sealed effect, extension sealing member life.

One possible embodiment of the second seal member is shown in fig. 12, and the second seal member prevents the spool chamber from communicating with the space in which the upper end of the spool communicates through the side wall of the outer peripheral wall of the spool. The inner wall of the guide member 136 is provided with a second mounting groove 1365 which is open along the radial direction, specifically, the inner wall of the spool guide portion 1364 of the guide member is provided with the second mounting groove 1365, the second sealing member 192 is positioned in the second mounting groove 1365 and is abutted against the outer side wall of one end of the spool connecting portion 1322 away from the valve port 1311, because the spool 132 moves, the second sealing member 192 is in sliding contact with the spool 132, the second sealing member 192 is axially limited by the groove wall forming the second mounting groove 1365, the second sealing member 132 cannot move up and down, and the second sealing member is pressed and radially deformed. The valve core diameter R2 of the valve core at the position where the valve core cooperates with the second sealing element 192 can be calculated by taking two sealing points located on the same horizontal plane where the valve core cooperates with the second sealing element, where a connecting line between the two sealing points and the valve core axis has an intersection point, and a distance between the two sealing points is the valve core diameter R2, and if a plurality of sealing points meeting the above requirements exist in the vertical direction or the horizontal direction, a distance between center points of the sealing points is taken as the valve core diameter R2, and the valve core diameter R1 in this embodiment is shown in fig. 12. The second sealing element 192 may be an O-ring made of elastic rubber material, and will be referred to as a first sealing ring for distinction.

Referring to fig. 13, in another embodiment of the second sealing element, the second sealing element 192 ' includes a second sealing ring 1921 ' and a sliding ring 1922 ', the second mounting groove is the same as the previous embodiment, the second sealing ring 1921 ' and the sliding ring 1922 ' are located in the second mounting groove together, the cross section of the sliding ring 1922 ' is substantially C-shaped, and is not strictly limited to the standard C-shape, the curvature of the C-shaped sliding ring facilitates the assembly guidance of the valve core, the sliding ring 1922 ' is open to the second sealing ring 1921 ' and contacts with the second sealing ring 1921 ', the sliding ring 1922 ' slides and contacts with the outer side wall of the valve core 132 in the radial direction away from the open end, the second sealing ring 1921 ' is axially limited by the groove wall forming the second mounting groove 1365 ', and the second sealing ring 1921 ' is pressed by the valve core 132 and deforms.

The C-shaped slip ring 1922 'engages a surface of the second seal ring 1921' to prevent relative slippage between the slip ring and the second seal ring during assembly. Moreover, the slip ring is designed to easily sense the deformation of the second sealing ring; in addition, the contact area of the slip ring and the valve core is relatively small, and the friction resistance when the valve core moves axially is further reduced. The slip ring can be made of common plastic materials, and Polytetrafluoroethylene (PTFE) can be contained in the material of the slip ring in order to further reduce the friction coefficient. The thickness of the slip ring can be between 0.2-0.6 mm, and the slip ring with the thickness can sense the deformation of the second sealing ring more sensitively so as to be attached to the valve core tightly and ensure the sealing property. The second sealing ring is an O-shaped sealing ring made of common elastic rubber materials. The spool diameter R2 of the spool in this embodiment where it mates with the second seal 192 is the distance between the seal points of the slip ring and the spool.

The second sealing element can be a Y-shaped sealing ring besides the above mentioned combination of the O-shaped sealing ring, the O-shaped sealing ring and the sliding ring, and can reduce the friction resistance when the valve core moves axially as much as possible while ensuring the sealing. As shown in fig. 14, the Y-shaped sealing ring 192 ″ has an open end, and the open end has two side arms, in this embodiment, one side arm is tightly attached to the outer side wall of the valve core, and the other side of the open end of the Y-shaped sealing ring 192 ″ is abutted to the groove wall forming the bottom of the second mounting groove, and as another embodiment, both side arms of the Y-shaped sealing ring 192 ″ may be tightly attached to the outer side wall of the valve core, that is, the Y-shaped sealing ring shown in fig. 14 may be mounted by rotating 90 ° counterclockwise.

Further, the valve device includes a third seal 193 and a fourth seal 194. A third seal 193 is located between the valve seat 14 and the connecting member 135 for preventing the working medium from leaking out. Referring to fig. 15, the lower end of the first flange portion 1351 of the connector also has an annular rib 1351a, which upon compression by the compression nut 18, the rib 1351a is capable of engaging the valve seat 14 to form a hard seal, which in combination with the soft seal of the third seal 193, enhances the sealing of the valve assembly. The rib 1351a, which may be made of stainless steel and the valve seat made of aluminum, may be harder than the valve seat 14 to engage the valve seat 14. The fourth sealing member 194 is sleeved on the outer peripheral wall of the valve plug seat 131, and more specifically, the fourth sealing member 194 is located on the valve plug seat below the valve port, the inner peripheral wall of the fourth sealing member 194 abuts against the valve plug seat 131, and the outer peripheral wall of the fourth sealing member 194 abuts against the valve seat 14, so as to further seal the valve plug seat and the valve seat, and enhance the sealing performance of the valve device.

Referring to fig. 16, as another embodiment of the valve device, the valve core assembly and the valve core assembly are in an integrated structure, the connecting member 135, the guiding member 136 and the valve core seat 131 in fig. 2 correspond to the valve core seat assembly 13A-1 in the integrated structure of the present embodiment, and the sleeve portion 137 and the valve core 132 in fig. 2 correspond to the valve core assembly 13B-1 in the integrated structure of the present embodiment. Unlike FIG. 2, the second seal 192-1 of this embodiment is directly fitted over the outer periphery of the spool assembly 13B-1 and can follow the movement of the spool assembly 13B-1, and the first seal is in the manner shown in FIG. 13.

As a further embodiment of the valve device, referring to fig. 17, the cartridge seat assembly 13A-2 is composed of a connector 135-2 and a cartridge seat 131-2, where the connector 135-2 is a combination of the connector 135 and the guide member 136 of fig. 2, and this embodiment designs the connector 135 and the guide member 136 of fig. 2 as an integral structure, i.e., the connector 135-2. The sleeve portion 137 and the spool 132 of the split structure in fig. 2 are integrated into the spool assembly 13B-2 in the present embodiment.

As a further embodiment of the valve device, referring to fig. 18, the cartridge seat assembly 13A-3 is composed of a connector 135-3 and a cartridge seat 131-3, where the cartridge seat 131-3 is a combination of the guide member 136 and the cartridge seat 131 in fig. 2, and the present embodiment designs the guide member 136 and the cartridge seat 131 in fig. 2 as an integral structure, namely, the cartridge seat 131-3.

As yet another embodiment of the valve device, referring to FIG. 19, the cartridge seat assembly 13A-4 is comprised of a connector 135-4, an upper guide member 136-1, a lower guide member 136-2, and a cartridge seat 131-4. The joint 135-4 is the same as the joint 135 shown in fig. 2, and the upper guide member 136-1 and the lower guide member 136-2 are combined to be equivalent to the guide member 136 of fig. 2. The spool assembly 13B-4 is composed of a sleeve portion 137-4 and a spool 132-4, the sleeve portion 137-4 is the same as the sleeve portion 137 of fig. 2, the spool 132-4 employs the spool shown in fig. 13, and the spool seat 131-4 also employs the spool seat shown in fig. 13.

The valve core seat component can be designed into an integral type or a split type, the valve core component can be integrated into an integral type or a split type, the valve core component can be matched with the valve core component with different structures more conveniently in an integral or split design, assembly is facilitated, and assembly efficiency is improved.

The present disclosure also provides an embodiment of a combination valve, a schematic cross-sectional structure of the combination is shown in fig. 20, the combination valve includes a valve device 10 and two check valves, which are respectively denoted as a first check valve 20 and a second check valve 30. The construction of the valve device is substantially the same as that shown in fig. 19, with the main differences being: the valve core 132 and the valve core seat 131 of the present embodiment have slightly different structures; the valve device of the present embodiment includes a third flow passage 143 in addition to the first flow passage 141 and the second flow passage 142.

Specifically, as shown in fig. 20 and 21, the first seal 191 is located at the periphery of the valve port 1311, and the lower end of the valve element 132 has a protrusion 1324', which is a different embodiment from that shown in fig. 12. In fig. 12, the protrusion 1324 is arc-shaped, in this embodiment, the position of the valve element 132 close to the axis is processed into an inward concave structure, so that the outer periphery of the valve element protrudes out of the valve element close to the axis to form a protrusion 1324 ', when the valve port 1311 is closed, the protrusion 1324' abuts against the first sealing member 191, the communication between the valve element cavity Cx and the space communicated with the lower end of the valve element 132 through the gap between the valve element seat 131 and the valve element 132 can be prevented, and the space at the lower end of the valve element 132 is communicated with the second communication portion 142. The valve device of the present embodiment includes a third flow passage 143 in addition to the first and

second flow passages

141 and 142, and a third port iii corresponding to the third flow passage 143 is provided on the valve seat 14. The first communicating portion 141 is located at one end of the spool chamber Cx, the third communicating portion 143 is located at the other end of the spool chamber Cx, and when the

check valves

20 and 30 are not provided, the first communicating portion 141 communicates with the spool chamber Cx, the third communicating portion 143 also communicates with the spool chamber Cx, the second communicating portion 142 is located at the lower end of the valve port 1311 as in fig. 19, and the second communicating portion 142 communicates with the spool chamber Cx through the valve port 1311. First port I, second port II and third port III are located the different sides of disk seat 14 respectively, make things convenient for external pipeline, and first port I and third port III are as working medium's import respectively, and second port II is as working medium's export.

A combination valve comprises, in addition to the valve device 10 described above, a first one-way valve 20, a second one-way valve 30. The first check valve 20 is located in the first flow portion 141, the first check valve 20 blocks a passage between the first flow portion 141 and the spool chamber Cx in the closed state, the working medium entering from the first port i cannot flow to the spool chamber Cx, the first check valve 20 can allow the working medium to flow in a single direction in the open state, and in the present embodiment, the first check valve 20 allows the working medium to flow through the first check valve 20 from the first port i and flow into the spool chamber Cx, but does not allow the working medium to flow in the reverse direction. Similarly, the second check valve 30 is located in the third flow-through portion 143, the second check valve 30 blocks a passage between the third flow-through portion 143 and the spool chamber Cx in the closed state, the working medium entering from the third port iii cannot flow to the spool chamber Cx, the second check valve 30 can allow the working medium to flow in one direction in the open state, and the working medium flows from the third port iii through the second check valve 30 and flows into the spool chamber Cx. The first one-way valve and the second one-way valve are not opened at the same time, and at least one of the first one-way valve and the second one-way valve is in a closed state.

The present embodiment provides a specific structure of the check valve, see fig. 20 and 22, but the present invention is not limited to the structure of the check valve, and other types of check valves are also possible and should be considered within the protection scope of the present invention. Taking the first check valve 20 as an example, the structure of the second check valve 30 in this embodiment is the same as that of the first check valve 20, the first check valve 20 includes a sealing stopper 21, a retainer ring 24, a spring 22, and a sliding rod 23, the retainer ring 24 has a plurality of through holes 241, the retainer ring 24 is elastically connected to the sealing stopper 21 through the spring 22, the middle of the sealing stopper 21 has a groove 211, one end of the spring 22 abuts against the bottom of the groove 211, and the other end of the spring 22 is fixedly connected to the retainer ring 24. Sealing stop 21 further has a sliding slot 212, one end of sliding rod 23 is fixedly connected to retaining ring 24, and the other end of sliding rod 23 is at least partially located in sliding slot 212 and slides in sliding slot 212. The check ring 24 is fixedly connected with the inner wall of the first circulation portion 131, the sealing stopper 21 is closer to the first port i than the check ring 24, and when the first check valve 20 is in a closed state, the sealing stopper 21 just blocks the first circulation portion 141, so that the working medium cannot flow from the first port i to the spool cavity Cx; when the pressure of the working medium at the first port i on the sealing stopper is gradually increased, the spring 22 is compressed to deform, the sealing contact between the sealing stopper 21 and the first circulating portion 141 is released, the first check valve 20 is opened, and the working medium can flow through the first check valve 20 through the gap between the sealing stopper 21 and the first circulating portion 141 and the through hole 241 of the check ring 24 and flow into the valve core cavity Cx.

The combination valve has the following working states: the working state I is as follows: the first check valve 20 and the spool 132 are at least partially opened, the second check valve 30 is closed, and the working medium can flow from the first port i to the spool chamber Cx through the first circulation portion 141 and flow out of the second port ii through the valve port 1311 and the second circulation portion 142, so that one-way communication and throttling from the first port i to the second port ii are realized. And a second working state: the second check valve 30 and the spool 132 are at least partially opened, the first check valve 20 is closed, and the working medium can flow from the third port iii to the spool chamber Cx through the third flow-through portion 143 and flow out of the second port ii through the valve port 1311 and the second flow-through portion 142, so that one-way conduction and throttling from the third port iii to the second port ii are realized. And a third working state: first check valve 20, second check valve 30, case 132 are all closed, and first port I, second port II, third port III all do not communicate, realize the function of two-way cut-off. In summary, the above-mentioned combination valve can realize the function of two-in one-out (two inlets and one outlet), and compared with the structure that two valve devices form a valve island, the combination valve can change the number of coils from two to one, so that the volume of the valve seat is also reduced, the loop inside the valve seat is also simplified, and the cost is reduced.

It should be noted that: although the present invention has been described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that the present invention may be modified and equivalents may be substituted for those skilled in the art, and all technical solutions and modifications that do not depart from the spirit and scope of the present invention should be covered by the claims of the present invention.

Claims

1. A valve device, comprising a valve component and a rotor component, wherein the valve component comprises a valve core and a transmission component, the valve device has a valve port, a valve core cavity, a first circulation portion and a second circulation portion, the first circulation portion is communicated with the valve core cavity, the valve port is located between the first circulation portion and the second circulation portion, the second circulation portion is communicated with the valve core cavity through the valve port, the rotor component drives the valve core to move axially through the transmission component, the valve core can move relative to the valve port to adjust the opening degree of the valve port, and the valve port and the valve core cooperate to communicate the valve core cavity and the second circulation portion, the valve device is characterized in that: the valve device is also provided with a balance circulation part, at least part of the balance circulation part is positioned in the valve core, the balance circulation part is directly or indirectly communicated with the second circulation part and a cavity positioned above the valve core, the valve core is directly or indirectly acted by the downward pressure of the working medium in the cavity, and the valve core is directly or indirectly acted by the upward pressure of the working medium in the second circulation part; the projection area of the force bearing surface of the valve core directly or indirectly acted by the upward pressure in the working medium direction on the horizontal plane is equal to the projection area of the force bearing surface of the valve core directly or indirectly acted by the downward pressure in the working medium direction on the horizontal plane.

2. The valve apparatus of claim 1, wherein: the valve core is provided with a first balance hole which penetrates through the valve core, the balance flow part comprises the first balance hole, and the transmission component is not provided with the balance flow part.

3. The valve apparatus of claim 2, wherein: the valve component also comprises a guide component, the guide component is provided with a valve core guide part, the inner diameter of the valve core guide part is matched with the outer diameter of the valve core, and the valve core is at least partially positioned in the valve core guide part; the guide component is provided with a second cavity, the second cavity is located above the upper end face of the valve core, the valve core is directly under the action of downward pressure of working media of the second cavity, and the second cavity is directly communicated with the second circulation portion through the first balance hole.

4. The valve apparatus of claim 2, wherein: the valve component further comprises a sleeve part, the transmission component comprises a screw rod and a nut seat, one end of the screw rod is connected with the rotor component, the other end of the screw rod is limited with the upper end of the sleeve part, and the bottom end of the sleeve part is limited with the valve core; the balance circulation part further comprises a second balance hole and a first through hole, the second balance hole and the first through hole are located in the sleeve part, the second balance hole extends along the axial direction of the sleeve part, the first through hole extends along the radial direction of the sleeve, the second balance hole is communicated with the first balance hole and the first through hole, and the first through hole is communicated with the second balance hole and the cavity located above the valve core.

5. The valve apparatus of claim 2 or 4, wherein: the valve component further comprises a sleeve part, the transmission part comprises a screw rod and a nut seat, one end of the screw rod is connected with the rotor component, the other end of the screw rod is limited with the upper end of the sleeve part, the bottom end of the sleeve part is limited with the valve core, the sleeve part is provided with a first cavity and a second balance hole, and the second balance hole is communicated with the first balance hole and the first cavity; the balance flow part comprises the first balance hole, the second balance hole and the first cavity, and the valve core is indirectly acted by the downward pressure of the working medium in the first cavity.

6. The valve apparatus of claim 5, wherein: the valve component also comprises a guide component, the guide component is provided with a valve core guide part, the inner diameter of the valve core guide part is matched with the outer diameter of the valve core, and the valve core is at least partially positioned in the valve core guide part; the guide member is provided with a second cavity, the second cavity is positioned above the upper end face of the valve core, the valve core is directly acted by downward pressure of a working medium of the second cavity, the balance circulation part further comprises a gap between the sleeve part and the screw rod and a gap between the guide member and the sleeve part, and the second cavity is communicated with the second circulation part through the balance circulation part.

7. The valve apparatus of claim 6, wherein: the valve component further comprises a supporting component, a first gasket and a spring, wherein the supporting component, the first gasket and the spring are positioned in the first cavity, the upper end of the spring is limited, the lower end of the spring is abutted against the supporting component, the supporting component is abutted against the first gasket, and the first gasket is positioned at the bottom of the first cavity; the balance flow path further includes a third balance hole and a fourth balance hole, the third balance hole is located in the support member, the fourth balance hole is located in the first gasket, and the third balance hole, the fourth balance hole, the second balance hole, and the first balance hole are provided in communication with each other.

8. The valve apparatus according to any one of claims 1 to 7, wherein: the valve component also comprises a valve seat and a valve core seat, the valve core seat is provided with the valve port and the valve core cavity, the valve seat is provided with the first through part and the second through part, and the valve core seat is fixedly connected with the valve seat or integrally formed with the valve seat; the valve core is at least partially positioned on the valve core seat; the valve core seat is fixedly connected with the lower end of the guide component or integrally formed.

9. The valve apparatus according to any one of claims 1 to 8, wherein: the valve device also comprises a first sealing element and a second sealing element, wherein the first sealing element is positioned on the periphery of the valve port, the first sealing element is in axial contact with the valve core, and the second sealing element is abutted with the outer side wall of the valve core; when the valve port is closed, the first sealing element can separate the first flow-through part from the second flow-through part, the second sealing element can separate the first flow-through part from a cavity above the valve core, and the area of a sealing surface of the upper end of the valve core, which is projected on a horizontal plane and falls into the second sealing element and the valve core, in the projection of the upper end of the valve core on the horizontal plane is equal to the area of a sealing surface of the lower end of the valve core, which is projected on the horizontal plane and falls into the first sealing element, in the projection of the sealing surface on the horizontal plane.

10. The valve apparatus of claim 9, wherein: the guide part is provided with the valve core guide part and a sleeve guide part, and a step part is arranged between the valve core guide part and the sleeve guide part; the inner diameter of the sleeve guiding part is matched with the outer diameter of the sleeve part, and the sleeve part is at least partially positioned in the sleeve guiding part; the second cavity is positioned between the upper end surface of the valve core and the step part; the second sealing element is positioned below the second cavity and prevents the valve core cavity from being communicated with the second cavity through a gap between the outer side wall of the valve core and the valve core guiding part.

11. A combination valve, characterized by: the valve device according to any one of claims 1 to 10, further comprising a third flow-through portion that communicates with the spool chamber, the combination valve further comprising a first check valve that is located at the first flow-through portion and blocks a passage between the first flow-through portion and the spool chamber in a closed state, the first check valve allowing a one-way flow of the working medium from the first flow-through portion to the spool chamber in an open state, and a second check valve that is located at the third flow-through portion and blocks a passage between the third flow-through portion and the spool chamber in a closed state, the second check valve allowing a one-way flow of the working medium from the third flow-through portion to the spool chamber in an open state, at least one of the first check valve and the second check valve being in a closed state.

12. The combination valve of claim 11, wherein: the valve device further comprises a valve seat, wherein the valve seat is provided with a first circulation part, a second circulation part and a third circulation part, the valve seat is further provided with a first port, a second port and a third port which respectively correspond to the first circulation part, the second circulation part and the third circulation part, the first port, the second port and the third port are respectively located on different sides of the valve seat, the first port and the third port are respectively used as inlets of the working medium, and the second port is used as an outlet of the working medium.

13. The combination valve of claim 12, wherein: the combination valve has a first working state, a second working state and a third working state, wherein the first working state is as follows: the first check valve is opened, the valve core is at least partially opened, the second check valve is closed, the working medium enters from the first port, and the second port flows out; and a second working state: the second check valve is opened, the valve core is at least partially opened, the first check valve is closed, the working medium enters from the third port, and the second port flows out; and a third working state: the first one-way valve, the second one-way valve and the valve core are all closed, and the working medium cannot flow out of the second port.