CN213017804U - Slide valve, combination valve and combination valve - Google Patents

Abstract

The utility model belongs to the technical field of the valve technique and specifically relates to a slide valve, combination valve and combination valve are related to. The slide valve comprises a valve body and a valve core; the valve core is arranged in the valve cavity in a sliding manner; the valve body is provided with a first port and a second port, and the valve body is also provided with a communicating flow passage; the valve core moves along the axial direction of the valve cavity to control the first port and the second port to be disconnected or connected through the communication flow channel, and when the first port and the second port are communicated with each other, fluid flowing from the first port flows into the second port through the communication flow channel, and the fluid can generate at least one pair of forces in opposite directions on the valve core. The compound valve comprises at least two slide valves, wherein valve bodies of the slide valves are fixedly connected, and second ports of the slide valves are communicated. The combination valve comprises a slide valve or/and a compound valve; the combination valve further comprises a driving device which can drive the valve core to move along the axial direction of the valve cavity. The utility model discloses can reduce or eliminate the displacement vibrations that the case produced when removing to a certain extent.

Description

Slide valve, combination valve and combination valve

Technical Field

The utility model belongs to the technical field of the valve technique and specifically relates to a slide valve, combination valve and combination valve are related to.

Background

The slide valve is a flow dividing valve which uses a valve core (plunger or valve clack) to slide on a sealing surface to change the positions of fluid inlet and outlet channels to control the flow direction of fluid, and is commonly used for hydraulic and pneumatic devices and the like.

When the valve core moves leftwards, the port P to A is opened, the oil generates hydraulic force because of the change of speed vector in the axial direction of the valve core, the hydraulic force acts on a right component force on the valve core, so that the valve core tends to close, the valve core generates displacement vibration at the moment, and the vibration of the slide valve acts on a device where the slide valve is located, so that the device vibrates.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a slide valve, combination valve and combination valve to the case of the slide valve that exists among the solution prior art can produce the technical problem of displacement vibrations when removing.

The utility model provides a slide valve, which comprises a valve body and a valve core; the valve body is provided with a valve cavity, and the valve core is arranged in the valve cavity in a sliding manner; the valve body is provided with a first port and a second port, and the valve body is also provided with a communicating flow passage; the axial movement of the valve core along the valve cavity can control the first port and the second port to be disconnected or connected through the communication flow passage, and when the first port and the second port are communicated, fluid flowing from the first port flows into the second port through the communication flow passage, and the fluid can generate at least one pair of forces in opposite directions on the valve core.

In any of the above technical solutions, further, the communication flow channel includes a first channel port and a second channel port; the valve core can be switched between a conducting position and a disconnecting position, wherein when the valve core is located at the conducting position, the first port, the first channel port, the second channel port and the second port are communicated in sequence; when the valve core is located at the disconnection position, the first port is disconnected from the first passage port, and the second passage port is disconnected from the second port.

In any one of the above technical solutions, further, in an axial direction of the valve chamber, the first port, the first passage port, the second port and the second passage port are arranged at an interval from each other;

the valve core comprises an inner core part, a first core part, a second core part, a third core part and an outer core part which are connected in sequence; the first core part and the third core part are respectively arranged with a clearance with the valve cavity to form an annular cavity for fluid to pass through.

In any one of the above technical solutions, further, the communication flow passage is configured to have a length extending direction in which a flow direction of the fluid flowing in from the first passage port and flowing out from the second passage port can be changed.

In any of the above technical solutions, further, the length extending direction of the communication flow channel is U-shaped.

In any of the above technical solutions, further, an elastic member is installed at an inner end of the valve cavity, and is capable of applying a force to the valve core from the inner end of the valve cavity to an outer end of the valve cavity; a backflow port is formed in the cavity wall at the inner end of the valve cavity.

In any of the above technical solutions, further, in a direction from an outer end of the valve chamber to an inner end of the valve chamber, the first port, the first passage port, the second port, and the second passage port are sequentially arranged at intervals;

or, in the direction from the outer end of the valve cavity to the inner end of the valve cavity, the first passage port, the first port, the second passage port and the second port are sequentially arranged at intervals.

The utility model also provides a combination valve, it includes at least two the sliding valve, all the valve body looks fixed connection of sliding valve, all be linked together between the second port of sliding valve.

The utility model also provides a combination valve, which comprises the slide valve or/and the compound valve; the combination valve also comprises a driving device which can drive the valve core to move along the axial direction of the valve cavity.

In any of the above technical solutions, further, the driving device includes one or more of a proportional solenoid valve, an electromagnet, or a lead screw.

Compared with the prior art, the beneficial effects of the utility model mainly lie in:

the utility model provides a slide valve, which comprises a valve body and a valve core; the valve body is provided with a valve cavity, and the valve core is arranged in the valve cavity in a sliding manner; the valve body is provided with a first port and a second port, and the valve body is also provided with a communicating flow passage; the valve core moves along the axial direction of the valve cavity to control the first port and the second port to be disconnected or connected through the communication flow channel, and when the first port and the second port are communicated with each other, fluid flowing from the first port flows into the second port through the communication flow channel, and the fluid can generate at least one pair of forces in opposite directions on the valve core. After the communication flow channel is arranged, when fluid flows from the first port to the second port through the communication flow channel, the fluid generates opposite forces to the valve core in pairs, so that the resultant force of the fluid to the valve core is reduced or zero, and the displacement vibration generated by the valve core during movement can be reduced or eliminated to a certain extent.

The utility model discloses the combination valve that still provides, it includes at least two the sliding valve, all the valve body looks fixed connection of sliding valve, all be linked together between the second port of sliding valve. Based on the analysis, the compound valve can reduce or eliminate displacement vibration generated when the valve core moves to a certain extent.

The utility model also provides a combination valve, which comprises the slide valve or/and the compound valve; the combination valve also comprises a driving device which can drive the valve core to move along the axial direction of the valve cavity. Based on the above analysis, the combination valve can reduce or eliminate displacement vibration generated when the valve core moves to a certain extent.

It is to be understood that both the foregoing general description and the following detailed description are for purposes of illustration and description and are not necessarily restrictive of the disclosure. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate the subject matter of the disclosure. Together, the description and drawings serve to explain the principles of the disclosure.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view (normally open state) of a normally open type combination valve in an embodiment of the present invention;

fig. 2 is a schematic structural diagram (closed state) of a normally open type combination valve in an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a normally closed combination valve according to an embodiment of the present invention (normally closed state, i.e., non-operating state);

fig. 4 is a schematic structural diagram (open state, i.e., working state) of a normally closed combination valve in an embodiment of the present invention;

fig. 5 is a schematic structural diagram of the combination valve of the embodiment of the present invention when the combination valve includes a combination valve.

Icon:

100-a valve core; 101-a valve body; 102-a reflow chamber; 103-a first port; 104-a second port; 105-a communicating flow channel; 106-first passage port; 107-second access; 108-ring cavity; 109-an inner core; 110-a first core; 111-a second core; 112-a third core; 113-an outer core portion; 114-a spring; 115-reflux port; 116-inner end face; 117-outer end face; 200-a composite valve body; 201-a third port; 202-fourth port; 203-fifth port; 204-a one-way valve; 300-proportional solenoid valve.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention.

Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example one

The first embodiment of the present invention provides a slide valve, which includes a valve body 101 and a valve core 100; the valve body 101 is provided with a valve cavity, and the valve core 100 is arranged in the valve cavity in a sliding mode; the valve body 101 is provided with a first port 103 and a second port 104, and the valve body 101 is also provided with a communicating flow passage 105; the axial movement of the valve body 100 along the valve chamber can control the disconnection or communication between the first port 103 and the second port 104 through the communication flow passage 105, and when the first port 103 and the second port 104 are communicated with each other, when the fluid flowing from the first port 103 flows into the second port 104 through the communication flow passage 105, the fluid can generate at least one pair of forces in opposite directions on the valve body 100. The fluid may be a gas or a liquid, and the liquid may be oil or water, etc.

Specifically, the radial cross-section of the valve cartridge 100 may be circular, and may be configured in other shapes, such as polygonal, as desired. In this embodiment, the first port 103 may be an inlet port and the second port 104 may be an outlet port. The on/off between the first port 103 and the second port 104 needs to be realized by controlling the on/off between the communication flow passage 105 and the first port 103 and controlling the on/off between the communication flow passage 105 and the second port 104 through the valve element 100. When the fluid flows from the first port 103 to the second port 104, the number of forces generated by the fluid on the valve element 100 is even; of the even number of forces, the number of forces generated to the valve spool 100 in the first direction is equal to the number of forces generated to the valve spool 100 in the second direction, the first direction is opposite to the second direction, and the first direction and the second direction are substantially or substantially parallel to the axial direction of the valve spool 100; when the fluid is capable of generating at least one pair of forces in opposite directions on the valve core 100, the resultant force of the fluid on the valve core 100 is small or zero, so that the influence of the fluid on the valve core 100 is reduced.

It should be noted that the first port 103 is not limited to be used as an inlet, and the second port 104 is not limited to be used as an outlet, and the flow direction can be changed as required.

In the spool valve provided by this embodiment, after the communication flow passage 105 is provided, when fluid flows from the first port 103 to the second port 104 through the communication flow passage 105, the fluid generates paired forces in opposite directions on the spool 100, which is beneficial to reducing or making zero a resultant force of the fluid on the spool 100, so that displacement vibration generated by the spool 100 during movement can be reduced or eliminated to some extent.

In an alternative scheme of this embodiment, the communication flow passage 105 includes a first passage port 106 and a second passage port 107 which are respectively communicated with the valve chamber; the valve core 100 can be switched between a conducting position and a disconnecting position, wherein when the valve core 100 is located at the conducting position, the first port 103, the first channel port 106, the second channel port 107 and the second port 104 are sequentially communicated, and fluid flows in from the first port 103, enters the inner cavity of the communicating channel 105 through the first channel port 106, flows out from the second channel port 107 and finally enters the second port 104; when the valve spool 100 is in the open position, the first port 103 is disconnected from the first port 106, and the second port 107 is disconnected from the second port 104. The connection and disconnection between the first port 103 and the second port 104 are realized by a communication flow passage 105.

Specifically, the first port 103 and the second port 104 are respectively communicated with the valve chamber; the first port 103 and the first passage port 106 are offset in the axial direction of the valve body 100, and the second port 104 and the second passage port 107 are offset in the axial direction of the valve body 100. The valve core 100 controls the on-off between the first port 103 and the second port 104 by controlling the on-off between the first passage port 106 and the first port 103, and controls the on-off between the second passage port 107 and the second port 104, so that the on-off between the first port 103 and the second port 104 is realized through the communication flow passage 105.

In an alternative of this embodiment, in the axial direction of the valve chamber, the first port 103, the first passage port 106, the second port 104 and the second passage port 107 are arranged at intervals, that is, any two different ports are arranged at intervals; the valve core 100 includes an inner core portion 109, a first core portion 110, a second core portion 111, a third core portion 112, and an outer core portion 113, which are connected in this order; the first and third cores 110, 112 are each disposed in spaced relation to the valve cavity to form an annular cavity 108 for passage of fluid therethrough. This facilitates the flow of fluid into and out of the communication flow passage 105 through the annular chamber 108.

Specifically, the diameter of the inner core portion 109, the diameter of the second core portion 111, and the diameter of the outer core portion 113 may be equal. The diameter of the first core 110 and the diameter of the third core 112 may be equal and smaller than the diameter of the second core 111 for realizing the annular cavity 108. The inner core 109, the second core 111 and the outer core 113 can be provided with sealing elements such as sealing rings to realize dynamic sealing with the cavity wall of the valve cavity.

In an alternative of this embodiment, the length of the communication flow channel 105 is configured to change the direction of flow of the fluid flowing from the first port 106 and flowing from the second port 107. By changing the flow direction of the fluid, the direction of the force of the fluid on the valve cartridge 100 is changed.

Specifically, the communication flow path 105 may have a U-shape in a longitudinal extending direction. It should be noted that the longitudinal extending direction of the communication flow channel 105 is not limited to the U shape, and may be other shapes, such as a broken line type or a wave type, as long as the flow direction of the fluid flowing in from the first channel port 106 and flowing out from the second channel port 107 can be changed.

In an optional scheme of this embodiment, an elastic member is installed in the inner end of the valve cavity, and the elastic member can apply a force to the valve core 100 from the inner end of the valve cavity to the outer end of the valve cavity; the cavity wall at the inner end of the valve cavity is provided with a backflow port 115. The elastic component is adopted to facilitate the resetting of the valve core 100, and the return port 115 is arranged, so that the phenomena of oil trapping and vacuum generation can be avoided.

Specifically, the valve spool 100 has opposite inner and outer end surfaces 116, 117, the inner end surface of the valve spool 100 being located on the inner core portion 109 and the outer end surface of the valve spool 100 being located on the outer core portion 113; one end of the elastic component is abutted against the cavity bottom at the inner end of the valve cavity, and the other end of the elastic component is abutted against the inner end face of the valve core 100. The resilient member portion may be a spring 114 or other resilient member. The return port 115 is near the bottom of the inner end of the valve chamber. The outer end of the valve cavity is of an open structure, so that the valve cavity is convenient for being externally connected with a driving device to drive the valve core 100 to move, or is controlled by pilot oil to act on the outer end surface of the valve core 100 by the pilot oil. After the fluid in the return cavity 102 formed by the inner end surface of the valve core 100 and the inner end of the valve cavity flows back through the return port 115, the phenomenon of oil trapping in the return cavity 102 of the spool valve is effectively avoided, and the valve core 100 can move rapidly. When the valve core 100 moves towards the direction of the outer end of the valve core, the valve core 100 moves towards the right to reset under the action of the elastic component, the return cavity 102 where the inner end face of the valve core 100 is located generates vacuum suction, fluid quickly fills the return cavity 102 through the return port 115, vacuum is prevented from being generated, and the valve core 100 can quickly reset. The resilient member is located in the flashback chamber 102.

In an alternative embodiment, the first passage opening 106 and the second passage opening 107 of the communication passage 105 are designed at different positions in the axial direction of the valve chamber of the spool valve, and two different spool valves of a normally open type and a normally closed type are formed. Two different types of slide valves are described below:

the first type is: referring to fig. 1 and 2, the normally open type spool valve has a first passage port 106, a first port 103, a second passage port 107, and a second port 104 arranged at intervals in this order in a direction from an outer end of the valve chamber toward an inner end of the valve chamber. When the elastic member is in the reset state (i.e., when the valve element 100 is located at the rightmost side of the valve chamber), the first port 103 is communicated with the first port 106, the second port 107 is communicated with the second port 104, and the first port 103 is communicated with the second port 104, and the valve element 100 is at the conducting position. After the valve core 100 overcomes the elastic force of the elastic component and moves towards the direction of the inner end of the valve cavity, the communication port between the first port 103 and the first channel port 106 is gradually reduced, the communication port between the second channel port 107 and the second port 104 is also gradually reduced, when the valve core 100 moves to the set position, the first port 103 is disconnected from the first channel port 106, the second channel port 107 is disconnected from the second port 104, the first port 103 is disconnected from the second port 104, and at this time, the valve core 100 is in the disconnected position.

The second type: referring to fig. 3 and 4, the curve with arrows in fig. 4 is a flow trace of the fluid, and the normally closed type spool valve has a first port 103, a first port 106, a second port 104 and a second port 107 which are arranged at intervals in sequence in a direction from an outer end of the valve chamber to an inner end of the valve chamber. When the elastic member is in the reset state (i.e., when the valve element 100 is located at the rightmost side of the valve chamber), the first port 103 is disconnected from the first port 106, the second port 107 is disconnected from the second port 104, and the first port 103 is disconnected from the second port 104, and the valve element 100 is at the off position. After the valve core 100 overcomes the elastic force of the elastic component and moves towards the direction of the inner end of the valve cavity, the communication port between the first port 103 and the first channel port 106 gradually increases, the communication port between the second channel port 107 and the second port 104 also gradually increases, when the valve core 100 moves to the set position, the first port 103 is communicated with the first channel port 106, the second channel port 107 is communicated with the second port 104, the first port 103 is communicated with the second port 104, and at this time, the valve core 100 is in the conduction position.

It should be noted that, in the direction from the inner end of the valve cavity of the spool valve to the outer end of the valve cavity, the relative positions of the second passage port 107, the second port 104, the first passage port 106, and the first port 103 are not limited to this, and may be set in other ways to meet the requirements of the normally open spool valve or the normally closed spool valve. In the drawing showing the communication flow passage, the communication flow passage and the second port are on the same side of the valve body, but the second port does not actually communicate with the middle of the communication flow passage.

The spool valve provided by this embodiment has the advantages that the forces generated by the fluid on the spool 100 are generated in pairs after the communication flow passage 105 is provided, and the directions of the forces generated in pairs are opposite, so that the forces generated by the fluid on the spool 100 are mutually offset or reduced to a minimum degree, and then the spool 100 has no impact during the connection or disconnection between the first port 103 and the second port 104 of the spool valve, which is reflected in that the device on which the spool valve is mounted has little or no vibration.

Example two

The embodiment two of the utility model provides a combination valve, it includes the slide valve that provides in two at least embodiments one, and the valve body 101 looks fixed connection of all slide valves is linked together between the second port 104 of all slide valves.

In this embodiment, the combination valve is specifically described by taking an example in which the combination valve includes two normally closed spool valves. Referring to fig. 5, the valve bodies 101 of the two normally closed type spool valves are of an integrated structure, and for convenience of description, the integrated structure formed by the valve bodies 101 of the two normally closed type spool valves is referred to as a composite valve body 200; the compound valve body 200 has a third port 201, a fourth port 202 and a fifth port 203. A check valve 204 may be installed at the third port 201 to allow fluid to flow only from the third port 201 to the valve cavity of the valve body 101, but not to flow backward. The third port 201 is the first port 103 of a normally closed spool valve; the fourth port 202 is the second port 104 of the other normally closed spool valve, and the first port 103 of the other normally closed spool valve is the fifth port 203, the fifth port 203 corresponding to the return port 115. The fourth port 202 may interface with some workload such as a boom, bucket, stick, travel motor, swing motor, or other device. While the fifth port 203 may be used for oil return, i.e. fluid flows out of the compound valve body 200 from the fifth port 203.

It should be noted that the spool valve in the combination valve may also be a combination of a normally closed spool valve and a normally closed spool valve, or a combination of a normally closed spool valve and a normally open spool valve.

EXAMPLE III

The embodiment of the utility model also provides a combination valve, which comprises a slide valve provided in the first embodiment or/and a compound valve provided in the second embodiment; the combination valve further comprises a driving means capable of driving the valve element 100 to move in the axial direction of the valve chamber.

In an alternative to this embodiment, the driving means comprises one or more of a proportional solenoid valve, an electromagnet or a lead screw. The driving means can move the valve cartridge 100 in one direction in the axial direction of the valve chamber or can move the valve cartridge 100 in both directions in the axial direction of the valve chamber.

In this embodiment, the driving device is specifically described as an example of the proportional solenoid valve 300. Combination valves can be divided into the following three types:

in the first case: referring to fig. 1 and 2, the combination valve includes a normally open type spool valve and a proportional solenoid valve 300 provided in the first embodiment. The combination valve forms a normally open combination valve. When the proportional solenoid valve 300 is not signaled, the outer end face of the valve spool 100 is closest to the outer end of the valve chamber of the valve body 101 by the spring 114, i.e., the valve spool 100 is located at the rightmost side. When the proportional solenoid valve 300 is signaled, the valve core 100 is moved toward the inner end of the valve cavity of the valve body 101 after overcoming the elastic force of the spring 114. When the proportional solenoid valve 300 is signaled, the valve core 100 moves to the right to reset under the action of the spring 114, the return cavity 102 where the inner end surface of the valve core 100 is located generates vacuum suction, fluid quickly fills the return cavity 102 through the return port 115, vacuum is prevented from being generated, and the valve core 100 can quickly reset. When the volume of the valve cavity of the spool valve changes due to the movement of the valve core 100, the fluid in the valve cavity can flow out or in, so that the pressure in the valve cavity is always controlled and meets the requirement, and the pressure cannot be too large or is not sucked empty.

In the second case: referring to fig. 3 and 4, the combination valve includes a normally closed spool valve and proportional solenoid valve 300 provided in the first embodiment. The combination valve forms a normally closed combination valve. When the proportional solenoid valve 300 is not signaled, the outer end surface of the valve spool 100 is closest to the outer end of the valve chamber by the spring 114, i.e., the valve spool 100 is located at the rightmost side. When the proportional solenoid valve 300 is signaled, the valve core 100 is moved toward the inner end of the valve cavity of the valve body 101 after overcoming the elastic force of the spring 114. When the proportional solenoid valve 300 is signaled, the valve core 100 moves to the right to reset under the action of the spring 114, the return cavity 102 where the inner end surface of the valve core 100 is located generates vacuum suction, fluid quickly fills the return cavity 102 through the return port 115, vacuum is prevented from being generated, and the valve core 100 can quickly reset. When the volume of the first spool valve changes due to the movement of the spool 100, the oil in the valve chamber can flow out or in, so that the pressure in the valve chamber is always controlled and meets the requirement, and the valve chamber is not excessively large or is not sucked empty.

In the third case: referring to fig. 5, a combination valve includes a combination valve and a proportional solenoid valve 300 provided in the second embodiment. The compound valve may include two normally closed spool valves. A proportional solenoid valve 300 controls a spool 100. The combination valve forms a normally open combination valve.

It should be noted that the combination valve may further include a slide valve as provided in the first embodiment and a combination valve as provided in the second embodiment. The spool 100 of the spool valve may be controlled by an actuator. The compounding valve may be controlled by at least two drive means.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention. In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description. Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments.

Claims (10)

1. A spool valve characterized by comprising a valve body (101) and a spool (100); the valve body (101) is provided with a valve cavity, and the valve core (100) is arranged in the valve cavity in a sliding mode; a first port (103) and a second port (104) are formed in the valve body (101), and a communicating flow passage (105) is further formed in the valve body (101); the axial movement of the valve core (100) along the valve cavity can control the first port (103) and the second port (104) to be disconnected or communicated through the communication flow channel (105), and when the first port (103) is communicated with the second port (104), fluid flowing from the first port (103) flows into the second port (104) through the communication flow channel (105), and the fluid can generate at least one pair of forces in opposite directions on the valve core (100).

2. A slide valve according to claim 1, characterized in that the communication flow passage (105) comprises a first passage port (106) and a second passage port (107); the valve spool (100) is switchable between an on position and an off position, wherein the first port (103), the first passage port (106), the second passage port (107) and the second port (104) are in communication in sequence when the valve spool (100) is in the on position; when the spool (100) is in the open position, the first port (103) and the first passage port (106) are open, and the second passage port (107) and the second port (104) are open.

3. A slide valve according to claim 2, characterized in that the first port (103), the first passage opening (106), the second port (104) and the second passage opening (107) are arranged spaced from each other in the axial direction of the valve chamber;

the valve core (100) comprises an inner core part (109), a first core part (110), a second core part (111), a third core part (112) and an outer core part (113) which are connected in sequence; the first core part (110) and the third core part (112) are respectively arranged in a clearance mode with the valve cavity to form an annular cavity (108) for fluid to pass through.

4. A slide valve according to claim 2 or 3, characterised in that the length extension of the communication flow channel (105) is arranged to be able to change the direction of flow of fluid flowing in from the first channel port (106) and out from the second channel port (107).

5. A slide valve according to claim 4, characterised in that the communication channel (105) has a U-shaped longitudinal extension.

6. A slide valve according to any one of claims 1-3, characterised in that the inner end of the valve chamber is fitted with a resilient member capable of exerting a force on the spool (100) in the direction from the inner end of the valve chamber to the outer end of the valve chamber; a backflow port (115) is arranged on the cavity wall at the inner end of the valve cavity.

7. A slide valve according to claim 2 or 3, wherein the first port (103), the first passage opening (106), the second port (104) and the second passage opening (107) are arranged in succession at a distance in the direction from the outer end of the valve chamber to the inner end of the valve chamber;

or, the first passage opening (106), the first port (103), the second passage opening (107) and the second port (104) are arranged at intervals in sequence in the direction from the outer end of the valve cavity to the inner end of the valve cavity.

8. A combination valve comprising at least two spools according to any of claims 1-7, wherein the valve bodies (101) of all of the spools are fixedly connected and wherein the second ports (104) of all of the spools are in communication with each other.

9. A combination valve, comprising a slide valve according to any one of claims 1 to 7 or/and a combination valve according to claim 8; the combination valve further comprises a driving device which can drive the valve core (100) to move along the axial direction of the valve cavity.

10. A combination valve according to claim 9, wherein the drive means comprises one or more of a proportional solenoid valve, an electromagnet or a lead screw.

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