Fluid distribution valve, distribution device and centralized lubrication system

Abstract

The utility model provides a fluid distribution valve, a distribution device and a centralized lubrication system. The fluid distribution valve comprises a valve seat and a valve element. The valve seat defines a lubricant inlet, a lubricant outlet and a valve cavity. The valve element comprises an outer plunger and an inner plunger, the outer plunger is arranged in the valve cavity, the outer plunger is configured to reciprocate in the axial direction of the valve cavity, and a sub-cavity is defined in the outer plunger. The inner plunger is arranged in the sub-cavity, and the inner plunger is configured to reciprocate relative to the outer plunger in the axial direction of the valve cavity so that the interior of the sub-cavity can be divided into a first metering chamber and a second metering chamber which are opposite in the axial direction of the valve cavity. And at least under the condition that the valve core moves to the first station, the first metering chamber is communicated with the lubricant inlet, and the second metering chamber is communicated with the lubricant outlet. In the case of the first station, the lubricant discharged from the second metering chamber is metered. By means of the arrangement, the problem that due to the fact that an existing distribution valve adds too much or too little lubricant, the lubrication filling precision is poor is solved, and user experience is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lubricant distribution, in particular to a fluid distribution valve, a distribution device and a centralized lubrication system. Background Art

[0002] At present, when using a distribution valve to control the filling of grease in a lubrication system, the distribution valve conducts on-off control according to the control signals of control devices such as an integrated control module, a controller of a lubricating pump, and a host computer, in order to control the filling amount of grease. However, the existing distribution valve can only control the on-off of the oil circuit and cannot directly control the filling amount. It can only indirectly measure data such as filling pressure and time and control it through conversion. Under different working environments, affected by factors such as the quality and service life of grease, the motor working conditions of the lubrication system, and the debugging accuracy, there are significant differences between the converted filling amount and the actual filling amount, which in turn causes the problem of overfilling or underfilling of grease. Whether the grease is overfilled or underfilled, it will lead to poor user feedback. For example, when overfilling grease, the consumption of grease accelerates and the use cost increases; when underfilling grease, the lubrication effect at the lubrication points is poor, which easily leads to an increase in the loss of lubrication points. Summary of the Utility Model

[0003] In view of the above problems, the present utility model is proposed to provide a fluid distribution valve, a distribution device and a centralized lubrication system that can overcome or at least partially solve the above problems, and can solve the problem of poor lubrication filling accuracy of the existing distribution valve, so as to achieve the purpose of improving the user experience.

[0004] Specifically, the present utility model provides a fluid distribution valve, comprising:

[0005] A valve seat defining a lubricant inlet, a lubricant outlet and a valve cavity, the valve cavity extending linearly;

[0006] A valve core including an outer plunger and an inner plunger, wherein,

[0007] The outer plunger is disposed in the valve cavity, the outer plunger is configured to reciprocate axially in the valve cavity, and a sub-cavity is defined within the outer plunger;

[0008] The inner plunger is disposed in the sub-cavity, the inner plunger is configured to reciprocate axially relative to the outer plunger in the valve cavity so as to divide a relative first metering chamber and a second metering chamber in the sub-cavity in the axial direction of the valve cavity; and

[0009] At least when the spool moves to the first working position, the first metering chamber communicates with the lubricant inlet, and the second metering chamber communicates with the lubricant outlet, so as to cause the lubricant in the first metering chamber to press the inner plunger and force the lubricant in the second metering chamber to be discharged from the lubricant outlet.

[0010] Optionally, the fluid distribution valve is further configured such that:

[0011] At least when the spool moves to the second working position, the second metering chamber communicates with the lubricant inlet, and the first metering chamber communicates with the lubricant outlet, so as to cause the lubricant in the second metering chamber to press the inner plunger and force the lubricant in the first metering chamber to be excluded from the lubricant outlet; and

[0012] Axially in the valve cavity, there is a spacing between the first working position and the second working position.

[0013] Optionally, the sub-chamber has a first opening and a second opening on the circumferential chamber wall, the first opening and the second opening are axially spaced apart on the outer plunger, and the first opening communicates with the first metering chamber, and the second opening communicates with the second metering chamber; and

[0014] At least when the spool moves to the first working position, the first metering chamber communicates with the lubricant inlet through the first opening, and the second metering chamber communicates with the lubricant outlet through the second opening.

[0015] Optionally, the first opening and the second opening are both in the plane where the axis of the outer plunger is located.

[0016] Optionally, the first opening and the second opening are respectively on the radially opposite sides of the outer plunger.

[0017] Optionally, there are at least two groups of the first openings, denoted as the first inlet group and the first outlet group; and there are at least two groups of the second openings, denoted as the second inlet group and the second outlet group; so that the fluid distribution valve is further configured such that:

[0018] At least when the spool moves to the first working position, the first metering chamber communicates with the lubricant inlet through the first inlet group, and the second metering chamber communicates with the lubricant outlet through the second outlet group; and

[0019] At least when the spool moves to the second working position, the second metering chamber communicates with the lubricant inlet through the second inlet group, and the first metering chamber communicates with the lubricant outlet through the first outlet group.

[0020] Optionally, the first inlet group and the first outlet group are symmetrically distributed on the two radial sides of the outer plunger; and / or

[0021] the second inlet group and the second outlet group are symmetrically distributed on the two radial sides of the outer plunger.

[0022] Optionally, the valve cavity has a third inlet and a fourth inlet both leading to the lubricant inlet, and a third outlet and a fourth outlet both leading to the lubricant outlet; wherein, the third inlet and the fourth inlet are axially spaced apart in the valve cavity, and the third outlet and the fourth outlet are axially spaced apart in the valve cavity; so as to cause the fluid distribution valve to be further configured to:

[0023] at least when the valve core moves to the first working position, the first inlet group is connected to the third inlet, and the second outlet group is connected to the fourth outlet; and

[0024] at least when the valve core moves to the second working position, the second inlet group is connected to the fourth inlet, and the first outlet group is connected to the third outlet.

[0025] Optionally, the third inlet, the fourth inlet, the third outlet, and the fourth outlet are all axially spaced apart on the outer plunger.

[0026] Optionally, blocking portions are correspondingly formed on the outer wall of the outer plunger and the inner wall of the valve seat, and the blocking portions are configured to:

[0027] at least when the valve core moves to the first working position, block the first outlet group, the second inlet group, the fourth inlet, and the third outlet; and / or

[0028] at least when the valve core moves to the second working position, block the first inlet group, the second outlet group, the third outlet, and the fourth inlet.

[0029] Optionally, the valve seat further forms a limiting portion, and the limiting portion is arranged in the valve cavity so as to cause it to be in limiting cooperation with the outer plunger when the valve core moves to the first working position.

[0030] Optionally, the fluid distribution valve further includes:

[0031] a driving device, connected to the valve seat and in transmission connection with the valve core to drive the valve core to reciprocate in the valve cavity.

[0032] Optionally, the driving device includes at least one of an electric push rod device, a cylinder, and a hydraulic cylinder.

[0033] The present utility model also provides a distribution device, including at least one fluid distribution valve as described in any one of the above, wherein,

[0034] when there is only one fluid distribution valve, it is configured to switch the on-off of the channel between the pumping station and the lubrication point; or

[0035] when there are at least two fluid distribution valves, each of the fluid distribution valves is configured to connect to the pumping station together, partially sharedly, or relatively independently.

[0036] The present utility model also provides a centralized lubrication system, including:

[0037] the distribution device as described above;

[0038] a pumping station, connected to the distribution device to inject lubricant to the lubrication point under the control of the distribution device.

[0039] In a fluid distribution valve, a distribution device, and a centralized lubrication system of the present utility model, since the outer plunger reciprocates axially in the valve cavity, the inner plunger is in the sub-cavity and reciprocates axially relative to the outer plunger, dividing the sub-cavity into a first metering chamber and a second metering chamber. When the valve core moves to the first working position, the lubricant enters the first metering chamber through the lubricant inlet, and the inner plunger moves under the push of the lubricant entering the first metering chamber, and then discharges the lubricant in the second metering chamber opposite to the first metering chamber from the lubricant outlet. Obviously, in the case of the first working position, the lubricant discharged from the second metering chamber is quantitative, ensuring the accuracy of the amount of lubricant discharged by the fluid distribution valve. This setting avoids the problem of poor lubrication filling accuracy caused by adding too much or too little lubricant in the existing distribution valve, improving the user experience.

[0040] From the following detailed description of specific embodiments of the present utility model in conjunction with the drawings, those skilled in the art will become more clear about the above and other objects, advantages, and features of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Some specific embodiments of the present utility model will be described in detail hereinafter with reference to the drawings in an exemplary and non-limiting manner. The same reference numerals in the drawings denote the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0042] Figure 1 is a schematic structural diagram of a fluid distribution valve in a first working position according to an embodiment of the present utility model;

[0043] Figure 2 is a schematic partial structural diagram of a fluid distribution valve in a second working position according to an embodiment of the present utility model. Detailed implementation manners

[0044] The following will describe a fluid distribution valve, a distribution device, and a centralized lubrication system according to an embodiment of the present utility model with reference to Figures 1 to 2 In the description of this embodiment, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features, that is, include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined. When a certain feature "includes or contains" a certain or certain features it covers, unless otherwise specifically described, this indicates that other features are not excluded and other features may be further included.

[0045] Unless otherwise clearly specified and defined, the terms "arranged", "installed", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. Those of ordinary skill in the art should be able to understand the specific meanings of the above terms in the present utility model according to specific situations.

[0046] In addition, in the description of this embodiment, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through other features therebetween. That is, in the description of this embodiment, the first feature being "above", "over", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath", or "under" the second feature may be the first feature being directly below or obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0047] In the description of this embodiment, the description with reference to terms such as "an embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0048] Figure 1 is a schematic structural diagram of a fluid distribution valve 10 according to an embodiment of the present invention in a first working position, as shown in Figure 1 shown, and referring to Figure 2 , an embodiment of the present invention provides a fluid distribution valve 10, including a valve seat 100 and a valve core. The valve seat 100 defines a lubricant inlet 101, a lubricant outlet 102, and a valve cavity 103, and the valve cavity 103 extends linearly. The valve core includes an outer plunger 210 and an inner plunger 220. Among them, the outer plunger 210 is disposed in the valve cavity 103, and the outer plunger 210 is configured to reciprocate axially in the valve cavity 103, and a sub-cavity is defined within the outer plunger 210. The inner plunger 220 is disposed in the sub-cavity, and the inner plunger 220 is configured to reciprocate axially relative to the outer plunger 210 in the valve cavity 103, so as to divide a relative first metering chamber 211 and a second metering chamber 212 in the axial direction of the valve cavity 103. And at least when the valve core moves to the first working position, the first metering chamber 211 communicates with the lubricant inlet 101, and the second metering chamber 212 communicates with the lubricant outlet 102, so as to urge the lubricant in the first metering chamber 211 to press the inner plunger 220, and compress the lubricant in the second metering chamber 212 to be discharged from the lubricant outlet 102.

[0049] The lubricant here refers to lubricating oil or grease. The outer plunger 210 reciprocates axially in the valve cavity 103, and the inner plunger 220 is in the sub-cavity and reciprocates axially relative to the outer plunger 210, dividing the sub-cavity into a first metering chamber 211 and a second metering chamber 212. When the valve core moves to the first working position, the lubricant enters the first metering chamber 211 through the lubricant inlet 101, and the inner plunger 220 moves under the push of the lubricant entering the first metering chamber 211, and then discharges the lubricant in the second metering chamber 212 opposite to the first metering chamber 211 from the lubricant outlet 102. Obviously, in the case of the first working position, the lubricant discharged from the second metering chamber 212 is quantitative, ensuring that the amount of lubricant discharged by the fluid distribution valve 10 is accurate. This setting avoids the problem of poor lubrication filling accuracy caused by adding too much or too little lubricant in the existing distribution valve, and improves the user experience.

[0050] In some embodiments of the present invention, as shown in Figure 2 shown, the fluid distribution valve 10 is further configured that: at least when the valve core moves to the second working position, the second metering chamber 212 communicates with the lubricant inlet 101, and the first metering chamber 211 communicates with the lubricant outlet 102, so as to urge the lubricant in the second metering chamber 212 to press the inner plunger 220, and compress the lubricant in the first metering chamber 211 to be discharged from the lubricant outlet 102. And in the axial direction of the valve cavity 103, there is a spacing between the first working position and the second working position.

[0051] When the valve core moves a certain distance from the first station to the second station, the lubricant enters the second metering chamber 212 through the lubricant inlet 101. The inner plunger 220 moves under the push of the lubricant entering the second metering chamber 212, and then discharges the lubricant in the first metering chamber 211 opposite to the second metering chamber 212 from the lubricant outlet 102. Obviously, in the case of the second station, the lubricant discharged from the first metering chamber 211 is also quantitative, which ensures again that the amount of lubricant discharged by the fluid distribution valve 10 is accurate. This setting also avoids the problem of poor lubrication filling accuracy caused by adding too much or too little lubricant in the existing distribution valve, and improves the user experience.

[0052] In some embodiments of the present invention, the sub-chamber has a first opening and a second opening on the circumferential chamber wall. The first opening and the second opening are axially spaced apart by the outer plunger 210, and the first opening communicates with the first metering chamber 211, and the second opening communicates with the second metering chamber 212. And at least when the valve core moves to the first station, the first metering chamber 211 communicates with the lubricant inlet 101 through the first opening, and the second metering chamber 212 communicates with the lubricant outlet 102 through the second opening.

[0053] The lubricant enters the fluid distribution valve 10 from the lubricant inlet 101. At least when the valve core moves to the first station, the lubricant enters the first metering chamber 211 from the first opening of the sub-chamber. At the same time, the lubricant in the second metering chamber 212 is discharged from the second opening through the lubricant outlet 102.

[0054] Further, in some embodiments of the present invention, the first opening and the second opening are in the same plane as the axis of the outer plunger 210. That is to say, the first opening and the second opening are in the same plane as the axis of the outer plunger 210, but there is an interval on the axis.

[0055] Alternatively, in some embodiments of the present invention, the first opening and the second opening are respectively on the radially opposite sides of the outer plunger 210. That is to say, the first opening and the second opening not only have an interval on the axis, but they are not in the same plane either.

[0056] In some embodiments of the present invention, such as Figure 1 and Figure 2As shown, there are at least two groups of first openings, denoted as the first inlet group 213 and the first outlet group 214. And there are at least two groups of second openings, denoted as the second inlet group 215 and the second outlet group 216. To enable the fluid distribution valve 10 to be further configured such that: at least when the valve core moves to the first working position, the first metering chamber 211 communicates with the lubricant inlet 101 through the first inlet group 213, and the second metering chamber 212 communicates with the lubricant outlet 102 through the second outlet group 216. And at least when the valve core moves to the second working position, the second metering chamber 212 communicates with the lubricant inlet 101 through the second inlet group 215, and the first metering chamber 211 communicates with the lubricant outlet 102 through the first outlet group 214.

[0057] To ensure the continuous operation of the distribution valve, there are at least two groups of first openings and at least two groups of second openings. At least when the valve core moves to the first working position, the outer plunger 210 moves to a position where the first metering chamber 211 communicates with the lubricant inlet 101 through the first inlet group 213. The lubricant enters the first metering chamber 211 through the lubricant inlet 101. The inner plunger 220 moves under the push of the lubricant entering the first metering chamber 211, and then discharges the lubricant in the second metering chamber 212 opposite to the first metering chamber 211 from the lubricant outlet 102 through the second outlet group 216. Then, the valve core moves to the second working position. And at least when the valve core moves to the second working position, the outer plunger 210 moves to a position where the second metering chamber 212 communicates with the lubricant inlet 101 through the second inlet group 215. The lubricant enters the second metering chamber 212 through the lubricant inlet 101. The inner plunger 220 moves under the push of the lubricant entering the second metering chamber 212, and then discharges the lubricant in the first metering chamber 211 opposite to the second metering chamber 212 from the lubricant outlet 102 through the first outlet group 214. With this setting, when the valve core cyclically switches between the first working position and the second working position, the inner plunger 220 also reciprocates, so that the fluid distribution valve operates continuously.

[0058] In some embodiments of the present invention, the first inlet group 213 and the first outlet group 214 are symmetrically distributed on the radial two sides of the outer plunger 210, and the second inlet group 215 and the second outlet group 216 are symmetrically distributed on the radial two sides of the outer plunger 210.

[0059] In some alternative embodiments of the present invention, the first inlet group 213 and the first outlet group 214 are symmetrically distributed on the radial two sides of the outer plunger 210, or the second inlet group 215 and the second outlet group 216 are symmetrically distributed on the radial two sides of the outer plunger 210.

[0060] In some embodiments of the present utility model, the valve cavity 103 has a third inlet 103 and a fourth inlet 104 both leading to the lubricant inlet 101, and a third outlet 105 and a fourth outlet 106 both leading to the lubricant outlet 102. Among them, the third inlet 103 and the fourth inlet 104 are axially spaced apart in the valve cavity 103, and the third outlet 105 and the fourth outlet 106 are axially spaced apart in the valve cavity 103. To further configure the fluid distribution valve 10 such that: at least when the valve core moves to the first working position, the first inlet group 213 is connected to the third inlet 103, and the second outlet group 216 is connected to the fourth outlet 106. And at least when the valve core moves to the second working position, the second inlet group 215 is connected to the fourth inlet 104, and the first outlet group 214 is connected to the third outlet 105.

[0061] When the valve core moves to the first working position, the lubricant passes through the third inlet 103, then enters the first metering chamber through the first inlet group 213, and causes the inner plunger 220 to move towards the second metering chamber opposite to the first metering chamber, discharging the lubricant in the second metering chamber through the second outlet group 216 and then through the fourth outlet 106. When the valve core moves to the second working position, the lubricant passes through the fourth inlet 104, then enters the second metering chamber through the second inlet group 215, and causes the inner plunger 220 to move towards the first metering chamber opposite to the second metering chamber, discharging the lubricant in the first metering chamber through the first outlet group 214 and then through the third outlet 105.

[0062] In some embodiments of the present utility model, the third inlet 103, the fourth inlet 104, the third outlet 105, and the fourth outlet 106 are all axially spaced apart on the outer plunger 210.

[0063] In some embodiments of the present utility model, blocking portions are correspondingly formed on the outer wall of the outer plunger 210 and the inner wall of the valve seat 100. The blocking portions are configured such that: at least when the valve core moves to the first working position, the first outlet group 214, the second inlet group 215, the fourth inlet 104, and the third outlet 105 are blocked. And at least when the valve core moves to the second working position, the first inlet group 213, the second outlet group 216, the third outlet 105, and the fourth inlet 104 are blocked. The blocking portions can ensure that when the valve core moves to the first working position, the lubricant in the second metering chamber is discharged through the second outlet group 216 and then through the fourth outlet 106. When the valve core moves to the second working position, the lubricant in the first metering chamber is discharged through the first outlet group 214 and then through the third outlet 105.

[0064] In some alternative embodiments of the present utility model, blocking portions are correspondingly formed on the outer wall of the outer plunger 210 and the inner wall of the valve seat 100, and the blocking portions are configured to block the first outlet group 214, the second inlet group 215, the fourth inlet 104, and the third outlet 105 at least when the valve core moves to the first working position. Or, at least when the valve core moves to the second working position, block the first inlet group 213, the second outlet group 216, the third outlet 105, and the fourth inlet 104.

[0065] In some embodiments of the present utility model, as Figure 1 shown, the valve seat 100 further forms a limiting portion 107, and the limiting portion 107 is arranged in the valve cavity 103 to be in limiting cooperation with the outer plunger 210 when the valve core moves to the first working position. The arrangement of the limiting portion 107 can ensure that the valve core can accurately move to the first working position, ensuring that lubricating oil enters the first metering chamber 211 and the second metering chamber 212 discharges oil outward.

[0066] In some embodiments of the present utility model, the fluid distribution valve 10 further includes a driving device 300, which is connected to the valve seat 100 and is in transmission connection with the valve core to drive the valve core to reciprocate in the valve cavity 103.

[0067] Further, in some embodiments of the present utility model, the driving device 300 includes at least one of an electric push rod device, a cylinder, and a hydraulic cylinder. Preferably, as Figure 1 shown, the driving device includes an electric push rod device 301.

[0068] The embodiment of the present utility model also provides a distribution device, including at least one fluid distribution valve 10 as described in any of the above embodiments. Wherein, when there is only one fluid distribution valve 10, it is configured to switch the on-off of the channel between the pumping station and the lubrication point. Or when there are at least two fluid distribution valves 10, each fluid distribution valve 10 is configured to be connected to the pumping station together, partially sharedly, or relatively independently.

[0069] The distribution device adopting the fluid distribution valve 10 including this embodiment ensures that the amount of lubricant discharged by the fluid distribution valve 10 is accurate. This setting avoids the problem of poor lubrication filling accuracy caused by adding too much or too little lubricant in the existing distribution device, and improves the user experience.

[0070] The embodiment of the present utility model also provides a centralized lubrication system, including a distribution device and a pumping station as described in any of the above embodiments. The pumping station is connected to the distribution device to inject lubricant to the lubrication point under the control of the distribution device.

[0071] A centralized lubrication system incorporating the dispensing device of the present embodiment ensures the accuracy of the amount of lubricant discharged by the fluid distribution valve 10. This arrangement avoids the problem of poor lubrication filling accuracy in existing centralized lubrication systems due to over- or under-addition of lubricant, improving the user experience.

[0072] At this point, those skilled in the art should recognize that although numerous exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived from the disclosed content of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and determined to cover all such other variations or modifications.

Claims

1. A fluid distribution valve, characterized in that, Comprising: A valve seat defining a lubricant inlet, a lubricant outlet, and a valve chamber, the valve chamber extending linearly; A valve core including an outer plunger and an inner plunger, wherein, The outer plunger is disposed in the valve chamber, the outer plunger being configured to reciprocate axially in the valve chamber, and a sub-chamber being defined within the outer plunger; The inner plunger is disposed in the sub-chamber, the inner plunger being configured to reciprocate axially relative to the outer plunger in the valve chamber so that a relative first metering chamber and a second metering chamber are separated within the sub-chamber in the axial direction of the valve chamber; And At least when the valve core moves to a first position, the first metering chamber communicates with the lubricant inlet, and the second metering chamber communicates with the lubricant outlet, so as to urge the lubricant in the first metering chamber to press the inner plunger and compress the lubricant in the second metering chamber to be discharged from the lubricant outlet.

2. The fluid distribution valve according to claim 1, characterized in that, The fluid distribution valve is further configured to: At least when the valve core moves to a second position, the second metering chamber communicates with the lubricant inlet, and the first metering chamber communicates with the lubricant outlet, so as to urge the lubricant in the second metering chamber to press the inner plunger and compress the lubricant in the first metering chamber to be discharged from the lubricant outlet; and in the axial direction of the valve chamber, there is a spacing between the first position and the second position.

3. The fluid distribution valve according to claim 1, characterized in that, The sub-chamber has a first opening and a second opening on the circumferential chamber wall, the first opening and the second opening being axially spaced apart on the outer plunger, and the first opening communicating with the first metering chamber, and the second opening communicating with the second metering chamber; and at least when the valve core moves to the first position, the first metering chamber communicates with the lubricant inlet through the first opening, and the second metering chamber communicates with the lubricant outlet through the second opening.

4. The fluid distribution valve according to claim 3, wherein The first opening and the second opening are both in the plane where the axis of the outer plunger is located.

5. The fluid distribution valve according to claim 3, characterized in that, The first opening and the second opening are respectively on the radially opposite sides of the outer plunger.

6. The fluid distribution valve according to claim 3, characterized in that, There are at least two groups of the first openings, denoted as a first inlet group and a first outlet group; and there are at least two groups of the second openings, denoted as a second inlet group and a second outlet group; so that the fluid distribution valve is further configured to: At least when the valve core moves to the first position, the first metering chamber communicates with the lubricant inlet through the first inlet group, and the second metering chamber communicates with the lubricant outlet through the second outlet group; And At least when the valve core moves to the second position, the second metering chamber communicates with the lubricant inlet through the second inlet group, and the first metering chamber communicates with the lubricant outlet through the first outlet group.

7. The fluid distribution valve according to claim 6, characterized in that, The first inlet group and the first outlet group are symmetrically distributed on the radially opposite sides of the outer plunger; and / or the second inlet group and the second outlet group are symmetrically distributed on the radially opposite sides of the outer plunger.

8. The fluid distribution valve according to claim 6, characterized in that, The valve cavity has a third inlet and a fourth inlet both leading to the lubricant inlet, and a third outlet and a fourth outlet both leading to the lubricant outlet; wherein, the third inlet and the fourth inlet are axially spaced apart in the valve cavity, and the third outlet and the fourth outlet are axially spaced apart in the valve cavity; so as to cause the fluid distribution valve to be further configured to: At least when the valve core moves to the first working position, the first inlet group is connected to the third inlet, and the second outlet group is connected to the fourth outlet; and At least when the valve core moves to the second working position, the second inlet group is connected to the fourth inlet, and the first outlet group is connected to the third outlet.

9. The fluid distribution valve according to claim 8, wherein, The third inlet, the fourth inlet, the third outlet and the fourth outlet are all axially spaced apart on the outer plunger.

10. The fluid distribution valve according to claim 8, characterized in that, Blocking portions are correspondingly formed on the outer wall of the outer plunger and the inner wall of the valve seat, and the blocking portions are configured to: At least when the valve core moves to the first working position, block the first outlet group, the second inlet group, the fourth inlet and the third outlet; and / or at least when the valve core moves to the second working position, block the first inlet group, the second outlet group, the third outlet and the fourth inlet.

11. The fluid distribution valve according to claim 1, characterized in that, The valve seat further forms a limiting portion, and the limiting portion is arranged in the valve cavity to cause the valve core to be in limiting cooperation with the outer plunger when the valve core moves to the first working position.

12. The fluid distribution valve according to claim 1, wherein, The fluid distribution valve further includes: a driving device, connected to the valve seat and in transmission connection with the valve core to drive the valve core to reciprocate in the valve cavity.

13. The fluid distribution valve according to claim 12, characterized in that, The driving device includes at least one of an electric push rod device, a cylinder and a hydraulic cylinder.

14. A dispensing device, characterized in that, Including at least one fluid distribution valve according to any one of the above claims 1 to 13, wherein, when there is only one fluid distribution valve, it is configured to switch the on-off of the channel between the pumping station and the lubrication point; or when there are at least two fluid distribution valves, each of the fluid distribution valves is configured to connect to the pumping station together, either jointly or partially or relatively independently.

15. A centralized lubrication system, characterized in that, Including: The distribution device according to claim 14 above; A pumping station, connected to the distribution device to inject lubricant to the lubrication point under the control of the distribution device.

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