Check valve, liquid cooling system and server

Abstract

The invention discloses a check valve, a liquid cooling system and a server, and relates to the technical field of valves, the check valve is characterized in that a first channel is arranged in a first valve body, and a first valve seat is arranged in the first valve body; the first valve core is movably arranged in the first valve body; according to the first valve element, a second channel is formed in a second valve body, the second valve body and a first valve seat form a first sealing pair, and a second valve seat is arranged in the second valve body; the first acting force enables the first channel to be conducted, and the forward conducting function of the check valve is achieved; when the second acting force is smaller than the opening pressure of the second valve element, the first channel and the second channel are kept closed, and the reverse cut-off function of the check valve is achieved; when the second acting force is larger than the opening pressure of the second valve element, the first channel is closed, the second channel is opened, residual liquid in the first valve body can be discharged from the second channel, liquid cannot be accumulated in the first valve body, and the check valve and the connector can be assembled in place.

Description

Technical Field

[0001] The present invention relates to the field of valve technology, and in particular to a check valve, a liquid cooling system and a server. Background Art

[0002] In the prior art, the inlet end of the check valve needs to be connected to the pipeline in advance for a functional test. However, after the functional test, coolant and other liquids will remain in the check valve. The residual liquid in the check valve makes it impossible to install the connector and the check valve in place during assembly. Alternatively, when the check valve is in operation, some liquid will accumulate in the check valve, causing excessive pressure in the check valve, which will harm the check valve. If the check valve is modified, the check valve may lose its original forward conduction and reverse cutoff functions.

[0003] Therefore, how to discharge the liquid remaining in the check valve due to functional testing or other reasons while ensuring the original forward conduction and reverse cut-off functions of the check valve, so that the check valve can be assembled in place with the joint and avoid damage to the check valve caused by excessive internal pressure has become a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0004] The object of the present invention is to provide a check valve, a liquid cooling system and a server to solve the problems existing in the above-mentioned prior art. Under the premise of ensuring the original forward conduction and reverse cut-off functions of the check valve, the liquid remaining in the check valve due to functional testing or other reasons is discharged, and the check valve can be assembled in place with the joint to avoid damage to the check valve caused by excessive internal pressure.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a check valve, comprising:

[0007] a first valve body, wherein a first passage for medium circulation is disposed in the first valve body, and a first valve seat is disposed in the first valve body;

[0008] a first valve core, the first valve core being movably disposed in the first valve body, the first valve core and the first valve seat forming a first sealing pair;

[0009] The first valve core comprises:

[0010] a second valve body, wherein a second passage for medium circulation is disposed in the second valve body, and a second valve seat is disposed in the second valve body;

[0011] a second valve core, the second valve core being movably disposed in the second valve body, the second valve core and the second valve seat forming a second sealing pair;

[0012] Wherein, the medium flowing along the first direction exerts a first force on the first valve core and the second valve core respectively;

[0013] If the first force is not greater than the opening pressure of the first valve core, the first valve core maintains a seal with the first valve seat, and the first passage is closed; if the first force is greater than the opening pressure of the first valve core, the first force causes the first valve core to separate from the first valve seat, and the first passage is opened;

[0014] The first force causes the second valve core to maintain sealing with the second valve seat, and the second passage is closed;

[0015] The medium flowing in the second direction applies a second force to the first valve core and the second valve core respectively, and the second force makes the first valve core and the first valve seat remain sealed, and the first channel is closed;

[0016] If the second force is not greater than the opening pressure of the second valve core, the second force causes the second valve core to maintain a seal with the second valve seat, and the second passage is closed; if the second force is greater than the opening pressure of the second valve core, the second force causes the second valve core to separate from the second valve seat, and the second passage is opened;

[0017] The first direction is opposite to the second direction, and the opening pressure of the second valve core is greater than the opening pressure of the first valve core.

[0018] Preferably, the check valve comprises a first elastic member, two ends of which are respectively connected to the first valve body and the second valve body, and the first elastic member is arranged along the movement track of the first valve core;

[0019] The first elastic member applies a third force to the second valve body, and the second force and the third force cause the first valve core to be sealed with the first valve seat, and the first channel is closed.

[0020] Preferably, a first support member is disposed in the first valve body, the first support member is sleeved on the outer side of the second valve body, the first support member and the first valve body are interference fit, and the first support member and the second valve body are clearance fit;

[0021] And / or, a second support member is provided in the second valve body, the second support member is sleeved on the outer side of the second valve core, the second support member and the second valve body are interference fit, and the second support member and the second valve core are clearance fit.

[0022] Preferably, the diameter of one end of the second valve core close to the second valve seat is 5 to 9 mm;

[0023] And / or, the inner diameter of one end of the second valve body close to the second valve core is 2 to 6 mm;

[0024] And / or, the radial sealing between the second valve seat and the second valve core on one side is greater than 0.5 mm;

[0025] And / or, the single-sided radial sealing between the second valve body and the first valve seat is greater than 0.5 mm;

[0026] And / or, the first sealing pair is an end face seal, a bevel seal or a spherical seal.

[0027] Preferably, the check valve comprises a first leakage mechanism, the first leakage mechanism comprises a leakage chamber and a switch, the leakage chamber is connected to the first channel, and the switch is used to control the connection and disconnection of the leakage chamber with the outside.

[0028] Preferably, the switch comprises a plug, and the plug is detachably arranged at the outlet of the discharge chamber;

[0029] Alternatively, the switch includes a leakage rod, the first end of which extends into the leakage chamber, and the first end of which has a leakage plug for blocking the leakage chamber, the leakage plug being movably disposed in the leakage chamber to control the on and off of the leakage chamber, and the leakage plug is arranged to avoid the first valve core.

[0030] Preferably, the check valve includes a second flow relief mechanism, which includes a push rod, which is arranged to avoid the first valve core, and the first end of the push rod is movably arranged in the first valve body, the second valve core is located on the movement trajectory of the first end of the push rod, and the second end of the push rod extends out of the first valve body.

[0031] Preferably, the second valve body is provided with a plurality of throttling holes, the throttling holes are arranged along the direction of reverse medium flow, and the cross-sectional area of ​​the throttling holes gradually decreases along the direction of reverse cut-off flow.

[0032] Furthermore, the present invention also discloses a liquid cooling system, which includes the check valve.

[0033] In addition, the present invention also discloses a server, wherein the server comprises the liquid cooling system.

[0034] Compared with the prior art, the present invention has achieved the following technical effects:

[0035] In the present invention, a first valve body is provided with a first valve seat and a first passage for medium circulation, a first valve core is movably provided in the first valve body, the first valve seat and the first valve core form a first sealing pair, the first valve core includes a second valve body, a second valve seat and a second passage for medium circulation are provided in the second valve body, the second valve core is movably provided in the second valve body, the second valve core and the second valve seat form a second sealing pair;

[0036] The medium flowing in a first direction, such as a forward direction, applies a first force to the first valve core and the second valve core respectively. If the first force is not greater than the opening pressure of the first valve core, the first valve core maintains a seal with the first valve seat, and the first channel is closed. If the first force is greater than the opening pressure of the first valve core, the first force causes the first valve core to separate from the first valve seat, and the first channel is connected. The first force causes the second valve core to maintain a seal with the second valve seat, and the second channel is closed, thereby realizing the "forward conduction" function of the check valve.

[0037] In a second direction opposite to the first direction, for example, a medium flowing in the reverse direction applies a second force to the second valve body and the second valve core respectively. No matter how large the second force is, the first valve body and the first valve seat always remain sealed, and the first channel remains closed. When the second force is not greater than the opening pressure of the second valve core, the second valve core and the second valve seat remain sealed, and the second channel also remains closed. This means that the first channel and the second channel in the present invention remain closed when the first valve core is working normally, that is, the present invention realizes the "reverse cut-off" function of the check valve. Moreover, when the second force is greater than the second When the valve core opens the pressure, the second valve core separates from the second valve seat and the second channel opens. At this time, the liquid remaining in the first valve body can be discharged from the second channel, and no liquid will accumulate in the first valve body. This not only allows the first valve body to smoothly discharge the liquid accumulated due to the functional test before being assembled with the joint, so that the check valve and the joint are assembled in place, but also releases the pressure in the check valve, avoiding the problem of damage to the check valve due to excessive internal pressure. Moreover, the opening pressure of the second valve core is greater than the opening pressure of the first valve core, which prevents the second channel from opening arbitrarily, thereby ensuring the smooth realization of the "reverse cut-off" function of the check valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 A schematic diagram of the structure of a check valve;

[0040] Figure 2is a structural schematic diagram of the first valve core;

[0041] Figure 3 is a schematic structural diagram of a first supporting member;

[0042] Figure 4 is a schematic structural diagram of a second supporting member;

[0043] Figure 5 is a structural schematic diagram of the first valve body;

[0044] Figure 6 is a structural schematic diagram of the second valve core;

[0045] Figure 7 is a structural schematic diagram of the second valve body;

[0046] Figure 8 is a schematic diagram of the cooperation between the second valve core and the second valve seat;

[0047] Fig. 9 is a schematic diagram of the cooperation between the first valve core and the first valve seat;

[0048] Among them, 1. the first valve body; 2. the second valve body; 3. the second valve core; 4. the first elastic member; 5. the second elastic member; 6. the first support member; 7. the second support member; 8. the first shell; 9. the second shell; 10. the first valve core. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0051] like Figures 1 to 9 As shown, the present invention discloses a check valve, which includes: a first valve body 1, in which a first passage for medium circulation is provided, and a first valve seat is provided in the first valve body 1; a first valve core 10, in which the first valve core 10 is movably provided in the first valve body 1, and the first valve core 10 and the first valve seat form a first sealing pair; the first valve core 10 includes: a second valve body 2, in which a second passage for medium circulation is provided, and a second valve seat is provided in the second valve body 2; a second valve core 3, in which the second valve core 3 is movably provided in the second valve body 2, and the second valve core 3 and the second valve seat form a second sealing pair;

[0052] The medium flowing in the first direction exerts a first force on the first valve core 10 and the second valve core 3 respectively;

[0053] If the first force is not greater than the opening pressure of the first valve core 10, the first valve core 10 maintains a seal with the first valve seat, and the first channel is closed; if the first force is greater than the opening pressure of the first valve core 10, the first force causes the first valve core 10 to separate from the first valve seat, and the first channel is connected; the first force causes the second valve core 3 to maintain a seal with the second valve seat, and the second channel is closed;

[0054] The medium flowing along the second direction applies a second force to the first valve core 10 and the second valve core 3 respectively, and the second force keeps the first valve core 10 and the first valve seat sealed, and the first channel is closed; if the second force is not greater than the opening pressure of the second valve core 3, the second force keeps the second valve core 3 and the second valve seat sealed, and the second channel is closed; if the second force is greater than the opening pressure of the second valve core 3, the second force causes the second valve core 3 to separate from the second valve seat, and the second channel is connected; the first direction and the second direction are opposite, and the opening pressure of the second valve core 3 is greater than the opening pressure of the first valve core 10.

[0055] In the present invention, a first valve body 1 is provided with a first valve seat and a first passage for medium circulation, a first valve core 10 is movably provided in the first valve body 1, the first valve seat and the first valve core 10 form a first sealing pair, the first valve core 10 includes a second valve body 2, a second valve seat and a second passage for medium circulation are provided in the second valve body 2, a second valve core 3 is movably provided in the second valve body 2, and the second valve core 3 and the second valve seat form a second sealing pair;

[0056] The medium flowing in a first direction, such as a forward direction, applies a first force to the first valve core 10 and the second valve core 3 respectively. If the first force is not greater than the opening pressure of the first valve core 10, the first valve core 10 maintains a seal with the first valve seat, and the first channel is closed. If the first force is greater than the opening pressure of the first valve core 10, the first force causes the first valve core 10 to separate from the first valve seat, and the first channel is connected. The first force causes the second valve core 3 to maintain a seal with the second valve seat, and the second channel remains closed, thereby realizing the "forward conduction" function of the check valve.

[0057] In a second direction opposite to the first direction, for example, a second force is applied to the second valve body 2 and the second valve core 3 respectively along a medium flowing in the reverse direction. No matter how large the second force is, the first valve body 1 and the first valve seat are always kept sealed, and the first channel is kept closed. When the second force is not greater than the opening pressure of the second valve core 3, the second valve core 3 and the second valve seat are kept sealed, and the second channel is also kept closed. This means that the first channel and the second channel in the present invention are kept closed when the first valve core 10 is working normally, that is, the present invention realizes the "reverse cut-off" function of the check valve. Moreover, when the second force is greater than the second valve seat, the second valve core 3 and the second valve seat are kept sealed, and the second channel is also kept closed. When the core 3 opens the pressure, the second valve core 3 separates from the second valve seat and the second channel opens. At this time, the residual liquid in the first valve body 1 can be discharged from the second channel, and no liquid will accumulate in the first valve body 1. This not only allows the first valve body 1 to smoothly discharge the liquid accumulated due to the functional test before being assembled with the joint, so that the check valve and the joint are assembled in place, but also releases the pressure in the check valve, avoiding the problem of damage to the check valve due to excessive internal pressure. Moreover, the opening pressure of the second valve core 3 is greater than the opening pressure of the first valve core 10, which prevents the second channel from opening arbitrarily, thereby ensuring the smooth realization of the "reverse cut-off" function of the check valve.

[0058] It should be noted that the opening pressure of the second valve core 3 is greater than the opening pressure of the first valve core 10, which prevents the second channel from opening arbitrarily. When there is liquid in the check valve and the internal pressure of the check valve is high, the second valve core 3 and the second channel will open. That is, the present invention ensures the pressure relief or flow relief function brought about by the opening of the second channel of the check valve while ensuring the "reverse cut-off" function of the check valve.

[0059] The first valve core 10 in the present invention is movably disposed in the first valve body 1, and the second valve core 3 is movably disposed in the second valve body 2, wherein the first valve core 10 can switch the sealing between the first valve core 10 and the first valve seat by rotating in the first valve body 1 or sliding in the first valve body 1 to realize the opening / closing of the first channel; similarly, the second valve core 3 can switch the sealing between the second valve core 3 and the second valve seat by rotating in the second valve body 2 or sliding in the second valve body 2 to realize the opening / closing of the second channel. The movement mode of the first valve core 10 in the first valve body 1 and the movement mode of the second valve core 3 in the second valve body 2 depend on the working conditions.

[0060] Furthermore, when the medium flows in the forward direction, the second channel is closed, which is specifically achieved by the cooperation between the second valve core 3 and the second valve body 2. Figures 1 to 9As shown, the present invention is provided with a step structure, i.e., a second valve seat, at one end of the second valve body 2 close to the second valve core 3, and the diameter of the end of the second valve core 3 close to the second valve body 2 is larger than the inner diameter of the end of the second valve body 2 close to the second valve core 3, i.e., the second valve seat. This allows the medium to flow forward, no matter how high the pressure is, before the second valve core 3 and the second valve body 2 are damaged, the second valve core 3 will maintain a seal with the second valve seat, thereby disconnecting the second channel. Similarly, the present invention is provided with a step structure, i.e., a first valve seat, at one end of the first valve body 1 close to the first valve core 10, specifically, close to the second valve body 2, and the diameter of the end of the second valve body 2 close to the first valve body 1 is larger than the inner diameter of the end of the first valve body 1 close to the second valve body 2, i.e., the first valve seat. This allows the medium to flow reversely, no matter how high the pressure is, before the first valve body 1 and the second valve body 2 are damaged, the first valve core 10, specifically, the second valve body 2 will maintain a seal with the first valve seat, thereby disconnecting the first channel.

[0061] The sealing between the first valve core 10 and the first valve seat, and the sealing between the second valve core 3 and the second valve seat in the present invention can be implemented in a variety of ways. For example, by relying on the deadweight of the first valve core 10, when the pressure of the medium flowing in the forward direction of the first valve core 10 is less than the opening pressure of the first valve core 10, the first valve core 10 abuts against and seals against the first valve seat to keep the first channel disconnected. Similarly, by relying on the deadweight of the second valve core 3, when the pressure of the medium flowing in the reverse direction of the second valve core 3 is less than the opening pressure of the second valve core 3, the second valve core 3 abuts against and seals against the second valve seat to keep the second channel disconnected.

[0062] Alternatively, the first valve core 10 is sealed with the first valve seat by the gravity of the first valve core 10 and the elastic force of the elastic member, closing the first channel; the second valve core 3 is sealed with the second valve seat by the gravity of the second valve core 3 and the elastic force of the elastic member, closing the second channel. At this time, the elastic member is a reset member that keeps the first valve core 10 sealed with the first valve seat.

[0063] In addition, a magnetic component may be provided in the check valve to assist the first valve core 10 in blocking the first channel by magnetic force, and to assist the second valve core 3 in blocking the second channel by magnetic force. At this time, the magnetic component is a reset component for the first valve core 10 to maintain a sealed state with the first valve seat; and other structures may be provided to assist the first valve core 10 in closing the first channel and assist the second valve core 3 in closing the second channel.

[0064] When the first valve core 10 is assisted by elastic force to close the first channel, the check valve includes a first elastic member 4, both ends of which are respectively connected to the first valve body 1 and the second valve body 2, and the first elastic member 4 is arranged along the movement trajectory of the first valve core 10; wherein the first elastic member 4 applies a third force to the second valve body 2, and the second force and the third force cause the first valve core 10 to be sealed with the first valve seat, and the first channel is closed.

[0065] Similarly, when the second valve core 3 is assisted by elastic force to close the second channel, a second elastic member 5 is provided between the second valve core 3 and the second valve body 2, and the two ends of the second elastic member 5 are respectively connected to the second valve core 3 and the second valve body 2, and the second elastic member 5 is arranged along the movement trajectory of the second valve core 3.

[0066] The first elastic member 4 and the second elastic member 5 can be specifically springs, or other structures that can assist the first valve core 10 and the second valve core 3 to reset and close the first channel and the second channel. When the first elastic member 4 and the second elastic member 5 are specifically springs, they can be made of stainless steel, so that the first elastic member 4 and the second elastic member 5 have a service life of no less than ten years, and ensure that the first elastic member 4 and the second elastic member 5 have appropriate elastic force. At the same time, in order to avoid wrong installation and reverse installation, when the first elastic member 4 and the second elastic member 5 are springs and slide in the first valve body 1 and the second valve body 2 respectively, straight springs can be specifically selected.

[0067] The types of the first elastic member 4 and the second elastic member 5 match the movement directions of the first valve core 10 and the second valve core 3, respectively. For example, when the first valve core 10 slides in the first valve body 1 and the first elastic member 4 is a spring, the first elastic member 4 should specifically be a compression spring; when the first valve core 10 rotates in the first valve body 1 and the first elastic member 4 is a spring, the first elastic member 4 should specifically be a torsion spring. The specific type of the second elastic member 5 matches the movement mode of the second valve core 3 in the same way as the matching mode of the first elastic member 4 and the second valve core 3, and will not be repeated here.

[0068] In addition, the present invention ensures that the first elastic member 4 and the second elastic member 5 are always in the allowable pressure range, that is, the elastic deformation range, by limiting the compression range of the first elastic member 4 and the second elastic member 5, that is, the working stroke of the first elastic member 4 and the second elastic member 5, thereby improving the service life of the first elastic member 4 and the second elastic member 5; at the same time, through simulation analysis, the optimal moving distance of the first valve core 10 and the second valve core 3 is determined, so that the forward conduction, reverse cutoff, and discharge functions of the check valve can be smoothly realized.

[0069] Furthermore, a first support member 6 is provided in the first valve body 1, and the first support member 6 is sleeved on the outer side of the second valve body 2. The first support member 6 and the first valve body 1 have an interference fit, and the first support member 6 and the second valve body 2 have a clearance fit; at this time, the two ends of the first elastic member 4 are respectively connected to the first support member 6 and the second valve body 2; and the first support member 6 may not have an interference fit with the first valve body 1, and may be formed in one piece; and / or, a second support member 7 is provided in the second valve body 2, and the second support member 7 is sleeved on the outer side of the second valve core 3, the second support member 7 and the second valve body 2 have an interference fit, and the second support member 7 and the second valve core 3 have a clearance fit, at this time, the two ends of the second elastic member 5 are respectively connected to the second support member 7 and the second valve core 3.

[0070] The first support member 6 strengthens the connection strength between the first valve core 10 and the first valve body 1, and improves the reliability between the first valve core 10 and the first valve seat. The interference fit between the first support member 6 and the first valve body 1 prevents the medium from directly impacting the first support member 6 when it circulates in reverse, and avoids the first support member 6 from sliding relative to the first valve body 1, which causes the first channel to be unable to open and close normally, affecting the normal use of the check valve, and improving the reliability of the check valve. In addition, the gap between the first support member 6 and the second valve body 2 is relatively appropriate, and the first valve core 10 will not swing left and right due to the gap being too large, thereby weakening the sealing of the check valve; nor will the first valve core 10 be stuck during movement due to the gap being too small, causing the first channel to be unable to close normally, thereby ensuring the normal opening and closing of the first channel.

[0071] At the same time, since the internal space of the check valve is relatively compact, without affecting the structural function of the check valve, the second support member 7 and the second valve body 2 in the present invention are connected by interference fit or laser welding, and the interference fit is set according to the standard (the standard can be understood as the interference fit required for the check valve). This ensures the connection strength between the second support member 7 and the second valve body 2, and avoids the problem of disintegration of the second support member 7 and the second valve body 2.

[0072] The provision of the second support member 7 also increases the connection strength between the second valve core 3 and the second valve body 2, and the second support member 7 can also be integrally formed with the second valve body 2. There is a clearance fit between the second support member 7 and the second valve core 3, and the clearance between the second support member 7 and the second valve core 3 is appropriate, so that the second valve core 3 will not swing left and right due to the clearance design being too large, thereby destroying the seal between the second valve core 3 and the second support member 7, and the second valve core 3 will not get stuck during the movement due to the clearance being too small, and the second channel cannot be opened or closed normally, thereby ensuring the normal opening and closing of the second channel.

[0073] Furthermore, in the present invention, the diameter A of the end of the second valve core 3 close to the second valve seat is 5-9 mm, specifically 7 mm; and / or, the inner diameter B of the end of the second valve body 2 close to the second valve core 3 is 2-6 mm, specifically 4 mm. By setting the diameter of the end of the second valve core 3 close to the second valve seat and the inner diameter of the end of the second valve body 2 close to the second valve core 3 to the above values, the "leakage valve" formed by the second valve core 3 and the second valve seat and other structures can meet the requirements, thereby avoiding the problem that the diameter of the end of the second valve core 3 close to the second valve seat and the inner diameter of the end of the second valve body 2 close to the second valve core 3 are set too large, resulting in a reduced opening pressure of the second valve core 3 and an excessive flow rate; and the diameter of the end of the second valve core 3 close to the second valve seat and the inner diameter of the end of the second valve body 2 close to the second valve core 3 are set too small, resulting in an increased opening pressure of the second valve core 3.

[0074] And / or, the single-sided radial seal between the second valve seat and the second valve core 3 is greater than 0.5mm; and / or, the single-sided radial seal between the second valve body 2 and the first valve seat is greater than 0.5mm; and / or, the first sealing pair is an end face seal, a bevel seal or a spherical seal, and the specific choice depends on the working conditions. The present invention prefers end face seals.

[0075] The present invention eliminates the rubber seal by sealing the end face, thus avoiding the problem that the rubber and stainless steel parts will be adhered to each other after long-term contact, resulting in the check valve being unable to open under the specified pressure, thereby causing the system pressure to be abnormal. The durability and reliability of the check valve are improved.

[0076] Furthermore, when a first support member 6 is provided between the first valve body 1 and the first valve core 10, a first elastic member 4 is provided between the second valve body 2 and the first support member 6, the first valve core 10 slides in the first valve body 1, a second support member 7 is provided between the second valve body 2 and the second valve core 3, a second elastic member 5 is provided between the second support member 7 and the second valve core 3, and the second valve core 3 slides in the second valve body 2; the forward-flowing medium refers to the medium flowing from the side of the second valve core 3 away from the first support member 6 to the side of the second valve core 3 close to the first support member 6, and the reverse-flowing medium refers to the medium flowing from the side of the second valve core 3 close to the first support member 6 to the side of the second valve core 3 away from the first support member 6 (it should be noted that the first support member 6 is only a structure introduced to facilitate the understanding of forward flow and reverse flow, and whether the first support member 6 is provided between the first valve body 1 and the first valve core 10 depends on the working conditions); the first valve seat refers to the medium provided on the first valve body 1, and the second valve body 2 is provided with a boss matching the step structure. When the boss on the second valve body 2 abuts against the step structure in the first valve body 1, i.e., the first valve seat, the first valve core 10 maintains a sealed state with the first valve seat, and the first channel is blocked. When the boss on the second valve body 2 no longer abuts against the step structure in the first valve body 1, the first valve core 10 and the first valve seat are released from the sealed state, and the first channel is opened. Similarly, the second valve seat refers to the step structure arranged in the second valve body 2, and the second valve core 3 is provided with a boss matching the step structure. When the boss on the second valve core 3 abuts against the step structure in the second valve body 2, i.e., the second valve seat, the second valve core 3 maintains a sealed state with the second valve seat, and the second channel is blocked. When the boss on the second valve core 3 no longer abuts against the step structure in the second valve body 2, the second valve core 3 and the second valve seat are released from the sealed state, and the second channel is opened (the first valve seat and the second valve seat can be specifically seen in FIG. Figure 1 ).

[0077] Based on the check valve described in the previous paragraph, the working process of the check valve in the present invention is illustrated as follows: when a medium flowing in a forward direction passes through the check valve, if the pressure of the medium flowing in a forward direction is greater than the opening pressure of the first valve core 10 (the opening pressure of the first valve core 10 includes the gravity of the first valve core 10 itself), the medium flowing in a forward direction pushes the first valve core 10 to move away from the first valve seat, thereby releasing the sealing state between the first valve core 10 and the first valve seat, and the first channel is connected. If the pressure of the medium flowing in a forward direction is not greater than the opening pressure of the first valve core 10, the first valve core 10 maintains a seal with the first valve seat under the action of its own gravity (if there is a reset member such as an elastic member or a magnetic member, the first valve core 10 maintains a seal with the first valve seat under the action of its own gravity and the reset member), and the first channel Closed means no conduction; and because the second valve core 3 maintains a sealed state with the second valve seat under the action of its own gravity before being acted upon by the positive medium (if there are reset parts such as elastic parts and magnetic parts, the second valve core 3 continues to maintain a sealed state with the second valve seat under the action of its own gravity and reset parts), and after the second valve core 3 is acted upon by the positive medium, the second valve core 3 will move toward the direction close to the second valve seat under the action of the positive medium, which undoubtedly makes the second valve core 3 fit more closely with the second valve seat, and the second valve core 3 and the second valve seat will continue to maintain a sealed state, and the second channel cannot be opened, that is, when the second valve core 3 and the second valve seat are not damaged, no matter how large the positive medium force is, the second valve core 3 and the second valve seat will continue to maintain a sealed state, and the second channel cannot be opened. At this time, the "positive conduction" function of the check valve is realized.

[0078] Because the first valve core 10 maintains a seal with the first valve seat under its own weight when it is not subjected to the force of the reverse medium (if there is a reset member such as an elastic member, a magnetic attraction member, etc., the first valve core 10 continues to maintain a seal with the first valve seat under the action of its own weight and the reset member), when there is reverse medium flowing in the check valve, when the check valve structure is not damaged, no matter how large the force of the reverse medium is, the reverse medium will cause the first valve core 10 to move toward the first valve seat, that is, the first valve core 10 will maintain a seal with the first valve seat under the force of the reverse medium, and the first channel will not open. Under the force of the reverse medium, when the force of the reverse medium is not greater than the opening pressure of the second valve core 3, the second valve core 3 maintains a seal with the second valve seat, and the second channel will not open, thereby realizing the "reverse cutoff" function of the check valve. When the force of the reverse medium is greater than the opening pressure of the second valve core 3, the second valve core 3 moves in the direction away from the second valve seat, releasing the sealing state between the second valve core 3 and the second valve seat, and the second channel is connected. Since the second valve core 3 moves in the direction close to the second valve seat, the seal with the second valve seat is tighter, so that the forward flowing medium (and the gravity of the second valve core 3 itself) pushes the second valve core 3 to move in the direction close to the second valve seat, maintaining the sealing state between the first valve core 10 and the first valve seat. In this way, the residual liquid in the first valve body 1 can be discharged from the second channel, so that the check valve can be accurately transferred to the joint, and the check valve will not be damaged due to excessive internal pressure.

[0079] In addition, the check valve of the present invention includes a first leakage mechanism, which includes a leakage chamber and a switch, the leakage chamber is connected to the first channel, and the switch is used to control the connection and disconnection of the leakage chamber with the outside world. Specifically, the switch includes a plug, which is detachably arranged at the outlet of the leakage chamber; or, the switch includes a leakage rod, the first end of the leakage rod extends into the leakage chamber, and the first end of the leakage rod has a leakage plug for blocking the leakage chamber, the leakage plug is movably arranged in the leakage chamber to control the connection and disconnection of the leakage chamber, and the leakage plug is arranged to avoid the first valve core 10.

[0080] However, when the second valve core 3 in the present invention fails and cannot open the second channel, or when the flow is not discharged through the second channel, the plug can be opened or the discharge rod can be moved toward the inside of the discharge chamber to open the discharge chamber, so that the discharge chamber is connected to the outside world and the residual liquid in the first valve body 1 is discharged.

[0081] Furthermore, the check valve of the present invention includes a second flow relief mechanism, which includes a push rod, which is arranged to avoid the first valve core 10, and the first end of the push rod is movably arranged in the first valve body 1, and the second valve core 3 is located on the movement trajectory of the first end of the push rod, and the second end of the push rod extends out of the first valve body 1. The second end of the push rod can be provided with a handle or other structure that facilitates the operation of the push rod. When the second valve core 3 cannot move due to the reverse flow of the medium, the push rod can be moved into the check valve until the first end of the push rod abuts against the second valve core 3, and the push rod is continuously moved inward until the second valve core 3 is pushed open to open the second channel.

[0082] In addition, a plurality of throttle holes are provided on the second valve body 2, and the throttle holes are arranged along the direction of reverse medium flow, and the cross-sectional area of ​​the throttle holes gradually decreases along the direction of reverse cut-off flow. By providing the above throttle holes, the speed of reverse flow of the medium can be reduced, thereby reducing the vibration of the second valve core 3 and the second valve body 2, and reducing the noise of the check valve. However, it should be noted that the setting of the throttle holes must not affect the normal flow of the reverse medium through the second channel.

[0083] The second valve core 3 in the present invention may specifically be a rod, or a steel ball, or other structures that can realize the above-mentioned functions of the second valve core 3 .

[0084] like Figures 1 to 9 As shown, the first valve body 1 in the present invention can be divided into two parts, a first shell 8 and a second shell 9. The first shell 8 and the second shell 9 are interference fit and welded together (specifically, laser welding can be used), thereby ensuring the sealing of the first valve body 1 and eliminating the sealing ring required for the existing check valve seal. Alternatively, the first shell 8 and the second shell 9 can also be pre-assembled without interference fit and directly welded together; or the first valve body 1 can also be directly integrally formed. At the same time, the second support member 7 and the second valve body 2 can also be pre-assembled without interference fit and directly welded into one.

[0085] The check valve in the present invention can be made entirely of stainless steel. The overall structure of the check valve in the present invention is simple, the function can meet the use requirements, the cost is low, and it is easy to produce and manufacture on a large scale. In addition, the check valve in the present invention substantially integrates the check function and the discharge function, reduces the assembly process, eliminates the risk of leakage, and improves the reliability of the product.

[0086] Furthermore, the present invention also discloses a liquid cooling system, which includes the check valve mentioned above. The "leakage valve" with a discharge function formed by the second valve body 2 and the second valve core 3 in the present invention works when the first valve body 1 and the pipeline assembly need to discharge the liquid in the first valve body 1. When the liquid cooling system using the check valve in the present invention works normally, the "leakage valve" formed by the second valve body 2 and the second valve core 3 is in a normally closed state, and the liquid cooling system has the following flow requirements for the "leakage valve" formed by the second valve body 2 and the second valve core 3: when 100kPa of coolant is introduced, the flow rate is ≤50mL / min; when 300kPa of coolant is introduced, the flow rate is ≤300mL / min; when 350kPa of coolant is introduced, the flow rate is ≥120mL / min.

[0087] In addition, the present invention also discloses a server, which includes the liquid cooling system mentioned above; compared with the air-cooling type cooling system, the liquid cooling system has the advantages of processing higher power density, running cleaner and quieter, and having lower overall cost; and when the liquid cooling system in the server adopts the check valve in the present invention, it can effectively avoid the negative impact of failure of the liquid cooling system, i.e. leakage, on the server.

[0088] The present invention discloses multiple technical solutions, but does not provide any contrary technical inspiration.

[0089] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A check valve, characterized in that: The check valve comprises: a first valve body, wherein a first passage for medium circulation is disposed in the first valve body, and a first valve seat is disposed in the first valve body; a first valve core, the first valve core being movably disposed in the first valve body, the first valve core and the first valve seat forming a first sealing pair; The first valve core comprises: a second valve body, wherein a second passage for medium circulation is disposed in the second valve body, and a second valve seat is disposed in the second valve body; a second valve core, the second valve core being movably disposed in the second valve body, the second valve core and the second valve seat forming a second sealing pair; The medium flowing in the first direction applies a first force to the first valve core and the second valve core respectively; if the first force is greater than the opening pressure of the first valve core, the first force causes the first valve core to separate from the first valve seat, and the first channel is connected; the first force causes the second valve core to maintain a seal with the second valve seat, and the second channel is closed; The medium flowing in the second direction applies a second force to the first valve core and the second valve core respectively, and the second force closes the first channel; if the second force is greater than the opening pressure of the second valve core, the second force opens the second channel; The first direction is opposite to the second direction, and the opening pressure of the second valve core is greater than the opening pressure of the first valve core.

2. The check valve according to claim 1, characterized in that: The check valve comprises a first elastic member, two ends of which are respectively connected to the first valve body and the second valve body, and the first elastic member is arranged along the movement track of the first valve core; The first elastic member applies a third force to the second valve body, and the second force and the third force cause the first valve core to be sealed with the first valve seat, and the first channel is closed.

3. The check valve according to claim 1, characterized in that: A first support member is disposed within the first valve body, the first support member is sleeved on the outer side of the second valve body, the first support member and the first valve body are interference fit, and the first support member and the second valve body are clearance fit; And / or, a second support member is provided in the second valve body, the second support member is sleeved on the outer side of the second valve core, the second support member and the second valve body are interference fit, and the second support member and the second valve core are clearance fit.

4. The check valve according to claim 1, characterized in that: The diameter of one end of the second valve core close to the second valve seat is 5 to 9 mm; And / or, the inner diameter of one end of the second valve body close to the second valve core is 2 to 6 mm; And / or, the radial sealing between the second valve seat and the second valve core on one side is greater than 0.5 mm; And / or, the single-sided radial sealing between the second valve body and the first valve seat is greater than 0.5 mm; And / or, the first sealing pair is an end face seal, a bevel seal or a spherical seal.

5. The check valve according to claim 1, characterized in that: The check valve includes a first flow leakage mechanism, which includes a flow leakage chamber and a switch. The flow leakage chamber is connected to the first channel, and the switch is used to control the connection and disconnection between the flow leakage chamber and the outside.

6. The check valve according to claim 5, characterized in that: The switch comprises a plug, which is detachably arranged at the outlet of the discharge chamber; Alternatively, the switch includes a leakage rod, the first end of which extends into the leakage chamber, and the first end of which has a leakage plug for blocking the leakage chamber, the leakage plug being movably disposed in the leakage chamber to control the on and off of the leakage chamber, and the leakage plug is arranged to avoid the first valve core.

7. The check valve according to claim 1, characterized in that: The check valve includes a second flow relief mechanism, which includes a push rod. The push rod is arranged to avoid the first valve core. The first end of the push rod is movably arranged in the first valve body. The second valve core is located on the movement trajectory of the first end of the push rod, and the second end of the push rod extends out of the first valve body.

8. The check valve according to claim 1, characterized in that: The second valve body is provided with a plurality of throttling holes, the throttling holes are arranged along the direction of reverse medium flow, and the cross-sectional area of ​​the throttling holes gradually decreases along the direction of reverse cut-off flow.

9. A liquid cooling system, characterized in that: The liquid cooling system comprises the check valve according to any one of claims 1-8.

10. A server, characterized in that: The server comprises the liquid cooling system of claim 9.

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