Check valve and hydraulic device

Abstract

The utility model relates to technical field of hydraulic element provides a check valve and hydraulic device. In check valve, the valve body forms the valve seat, the valve core sets up with the valve body movably, and is suitable for opening or closing the valve seat. The main elastic member can apply the main elastic force of making it tend to close to the valve core, the auxiliary elastic member can apply the adjustable auxiliary elastic force of the reverse of main elastic force to the valve core, and the net elastic force more accurate than single spring is created through the force balance of main, auxiliary elastic member, when the medium flows positively, the lower positive differential pressure can overcome the net elastic force, drives the valve core to separate from the valve seat and realizes the opening, and when the medium flows reversely or stops, the main elastic force leads the valve core to reset to the closed state quickly, effectively prevents the medium backflow. Thus, it can realize sensitive opening and quick closing in the precision control occasion needing very low opening differential pressure and very low closing differential pressure, effectively expands the applicability of check valve in low differential pressure high sensitivity application.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic component technology, and in particular to a check valve and a hydraulic device. Background Technology

[0002] A check valve is a type of valve that automatically controls the opening and closing of its disc based on the flow of the medium to prevent reverse flow. It is widely used in industrial piping systems to prevent backflow, pump and motor reversal, and container leakage. Traditional check valves have relatively high spring stiffness, requiring a significant spring force to be overcome when the valve disc opens, typically relying on a high forward pressure differential to achieve operation. However, in precision control applications requiring extremely low opening pressure differentials (e.g., below 0.01 MPa) and extremely low closing pressure differentials (e.g., below 0.03 MPa), it is difficult to achieve sensitive opening and rapid closing, limiting its applicability in low-pressure-differential, high-sensitivity conditions. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides a check valve and a hydraulic device.

[0004] A first aspect of this utility model provides a check valve, comprising: a valve body having a valve seat formed thereon; a valve core movably disposed within the valve body and adapted to open or close the valve seat; a main elastic member capable of applying a main elastic force to the valve core to tend towards closing; and an auxiliary elastic member applying an auxiliary elastic force to the valve core in the opposite direction to the main elastic force, so as to at least partially counteract the main elastic force.

[0005] According to the present invention, a check valve further includes an adjusting mechanism connected to the auxiliary elastic element, which is used to adjust the auxiliary elastic force of the auxiliary elastic element.

[0006] According to the present invention, a check valve is provided, the check valve further includes a limiting support plate disposed in the valve body.

[0007] The valve core includes: a valve core body disposed between the limiting support plate and the valve seat; and a valve stem, one end of which is connected to the valve core body, and the other end of which is movably inserted through one side of the limiting support plate to the other side of the limiting support plate.

[0008] According to the present invention, a check valve is provided, wherein the main elastic element includes a main spring, which is sleeved on the valve stem and located between the limiting support plate and the valve core body.

[0009] According to the present invention, a check valve is provided, wherein the main elastic element is disposed between the limiting support plate and the valve core body. The check valve further includes a locking element connected to the end of the valve stem away from the valve core body. An auxiliary elastic element is disposed between the locking element and the limiting support plate.

[0010] According to the present invention, a check valve is provided, wherein the main elastic element includes a main spring, which is sleeved on the valve stem and located between the limiting support plate and the valve core body.

[0011] According to the present invention, a check valve is provided, wherein the auxiliary elastic element includes an auxiliary spring, which is sleeved on the valve stem and located between the locking element and the limiting support plate.

[0012] According to the present invention, a check valve is provided, wherein the locking element includes a locking nut, which is threadedly connected to one end of the valve stem away from the valve core body.

[0013] According to the present invention, a check valve is provided, wherein the adjusting mechanism includes an adjusting nut, which is threadedly connected to the valve stem and located between the locking member and the auxiliary elastic member.

[0014] According to the present invention, a check valve is provided, the valve body comprising: a first half valve body; and a second half valve body, wherein the second half valve body is connected to the first half valve body.

[0015] The valve seat is provided on one of the first half valve body and the second half valve body, and the flow port is provided on the other half valve body. The flow port and the valve seat can communicate with each other or be mutually blocked.

[0016] A second aspect of this invention provides a hydraulic device including the check valve described above.

[0017] The check valve provided by this utility model includes a valve body, a valve core, a main elastic element, and an auxiliary elastic element. A valve seat is formed on the valve body, and the valve core is movably disposed within the valve body and adapted to open or close the valve seat. The main elastic element can apply a main elastic force to the valve core, tending it to close, while the auxiliary elastic element can apply an auxiliary elastic force to the valve core in the opposite direction to the main elastic force, at least partially offsetting the main elastic force. Thus, through the force balance of the main and auxiliary elastic elements, a more precise net opening and closing elastic force than that of a single spring is created.

[0018] The main elastic element applies a main elastic force to the valve core, causing it to tend to close. At the same time, the auxiliary elastic element applies an auxiliary elastic force that is opposite to the main elastic force. Through the force balance of the main and auxiliary elastic elements, a net opening and closing elastic force that is more precise than that of a single spring is created. When the medium flows in the forward direction, a lower forward pressure difference can overcome this net elastic force and drive the valve core to disengage from the valve seat to open. When the medium flows in the reverse direction or stops flowing, the main elastic force guides the valve core to quickly return to the closed state, effectively preventing backflow of the medium.

[0019] During operation, when the medium's positive pressure acts on the valve core, this pressure overcomes the smaller net elastic force formed by the cancellation of the main elastic force and the auxiliary elastic force, pushing the valve core from the closed position of the sealed valve seat to the open state of being detached from the valve seat, allowing the medium to pass through; once the medium pressure drops or reverse flow occurs, the main elastic force immediately drives the valve core to quickly return to the closed state, ensuring the valve seat is sealed, thereby achieving automatic opening and closing and preventing medium backflow.

[0020] As described above, this technical solution addresses the problem of high opening pressure differential and difficulty in sensitive operation in extremely low opening pressure differential situations caused by excessive spring stiffness in traditional check valves. By using an auxiliary elastic element to at least offset the main elastic force, it significantly reduces the positive pressure differential required for valve core opening. This enables sensitive opening and rapid closing even in precision control applications requiring extremely low opening and closing pressure differentials, effectively expanding the applicability of check valves in low-pressure-differential, high-sensitivity applications.

[0021] Furthermore, the hydraulic device provided by this utility model, since it includes the check valve as described above, also possesses the advantages described above. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the internal structure of the check valve provided by this utility model.

[0024] Figure 2 This is a side view of the external structure of the check valve provided by this utility model.

[0025] Reference numerals: 100, valve body; 110, first half valve body; 120, second half valve body; 130, valve seat; 200, valve core; 210, valve core body; 220, valve stem; 300, main elastic element; 400, auxiliary elastic element; 500, adjusting mechanism; 600, limit support plate; 700, locking element. Detailed Implementation

[0026] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0027] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0029] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this specification, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions 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 any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples, to make the objectives, technical solutions, and advantages of the present invention clearer. The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] The following is combined Figure 1 and Figure 2 This invention describes a check valve and hydraulic device provided in an embodiment of the present invention. It should be understood that the following description is merely an illustrative embodiment of the present invention and does not constitute any particular limitation on the present invention.

[0032] An embodiment of the first aspect of this utility model provides a check valve, such as... Figure 1 As shown, it includes: a valve body 100, on which a valve seat 130 is formed; a valve core 200, which is movably disposed within the valve body 100 and adapted to open or close the valve seat 130; a main elastic member 300, which is capable of applying a main elastic force to the valve core 200 to tend to close it; and an auxiliary elastic member 400, which applies an auxiliary elastic force to the valve core 200 in the opposite direction to the main elastic force to at least partially counteract the main elastic force.

[0033] The main elastic element 300 applies a main elastic force to the valve core 200, causing it to tend to close the valve seat 130. At the same time, the auxiliary elastic element 400 applies an auxiliary elastic force opposite to the main elastic force, thereby at least partially offsetting the main elastic force and reducing the net elastic force required for the valve core 200 to open. When the medium flows in the forward direction, the lower forward pressure difference can overcome the net elastic force and drive the valve core 200 to disengage from the valve seat 130 to open. When the medium flows in the reverse direction or stops flowing, the main elastic force leads the valve core 200 to quickly return to the closed state, effectively preventing the medium from flowing back.

[0034] During operation, when the positive pressure of the medium acts on the valve core 200, this pressure overcomes the smaller net elastic force formed by the cancellation of the main elastic force and the auxiliary elastic force, pushing the valve core 200 from the closed state of the sealed valve seat 130 to the open state of the valve seat 130, allowing the medium to pass through; once the medium pressure drops or reverse flow occurs, the main elastic force immediately drives the valve core 200 to quickly return to the closed state, ensuring the valve seat 130 is sealed, thereby realizing automatic opening and closing and preventing medium backflow.

[0035] As described above, this technical solution addresses the problem of high opening pressure differentials and difficulty in sensitive operation under extremely low opening pressure differentials caused by excessively stiff springs in traditional check valves. This is achieved by using an auxiliary elastic element 400 to partially offset the main elastic force, significantly reducing the positive pressure differential required for valve core 200 to open. This allows for sensitive opening and rapid closing even in precision control applications requiring extremely low opening pressure differentials, effectively expanding the applicability of check valves in low-pressure-differential, high-sensitivity applications. For example, the check valve can reliably open under an extremely low positive pressure differential of 0.0035 MPa and quickly close and maintain a tight seal when the pressure differential drops to 0.001 MPa, meeting the requirements of precision operating conditions.

[0036] Under extreme conditions, the auxiliary elastic force can completely counteract the main elastic force, putting the valve core 200 in a critical state, which can be opened by a smaller pressure difference.

[0037] To improve the sealing performance of the valve core 200 when it is closed, an O-ring can be installed between the valve core 200 and the valve seat 130, such as an O-ring installed on the valve core 200.

[0038] In one embodiment of this utility model, such as Figure 1 As shown, the check valve also includes an adjusting mechanism 500, which is connected to an auxiliary elastic element 400 and is used to adjust the auxiliary elastic force of the auxiliary elastic element 400.

[0039] When the medium flows in the forward direction, the pressure it generates acts on the valve core 200. This pressure must overcome the net elastic force resulting from the mutual cancellation of the main elastic force and the auxiliary elastic force set by the regulating mechanism 500. By operating the regulating mechanism 500, the pre-compression or effective force of the auxiliary elastic element 400 can be changed, thereby precisely adjusting the magnitude of the auxiliary elastic force it provides. This allows the user to set the net resistance required for opening the valve core 200 to the optimal value according to the actual pressure differential requirements of the operating conditions. For example, in situations requiring extremely low opening pressure differentials, the auxiliary elastic force can be increased to further counteract the main elastic force, thus achieving sensitive opening. When the medium pressure fluctuates or shows a reverse flow trend, the main elastic force regains dominance in the net force, driving the valve core 200 to close quickly and reliably. The opening and closing characteristics of the entire process can be calibrated and adapted through the regulating mechanism 500.

[0040] By incorporating the regulating mechanism 500, the limitations of traditional check valves—fixed performance parameters and difficulty in adapting to varying operating conditions—are overcome. Its core effect lies in achieving adjustable and adaptive opening pressure differentials: users can precisely set the auxiliary elastic force through the regulating mechanism 500, thereby freely matching the required opening pressure differential value within a wide range. This not only ensures the valve's sensitivity under precise low pressure differential conditions but also allows it to flexibly adapt to the needs of different media, system pressure, or flow rate changes. Furthermore, this design enhances the product's versatility and lifespan. By compensating for potential fatigue or performance degradation of the main elastic element 300 due to long-term use, it maintains stable valve opening and closing performance, significantly expanding the check valve's application areas in complex, high-requirement industrial piping systems.

[0041] In one embodiment of the present invention, the check valve further includes a limiting support plate 600, which is disposed within the valve body 100.

[0042] The valve core 200 includes: a valve core body 210, which is disposed between the limiting support plate 600 and the valve seat 130; and a valve stem 220, one end of which is connected to the valve core body 210, and the other end of which is movably inserted from one side of the limiting support plate 600 to the other side of the limiting support plate 600.

[0043] According to one embodiment of the present invention, the main elastic element 300 is disposed between the limiting support plate 600 and the valve core body 210.

[0044] The check valve also includes a locking element 700, which is connected to the end of the valve stem 220 away from the valve core body 210.

[0045] An auxiliary elastic element 400 is disposed between the locking element 700 and the limiting support plate 600.

[0046] According to one embodiment of the present invention, the valve body 100 includes: a first half-valve body 110; a second half-valve body 120, which is connected to the first half-valve body 110; one of the first half-valve body 110 and the second half-valve body 120 is provided with a valve seat 130, and the other half-valve body 110 and the second half-valve body 120 are provided with a flow port, which can communicate with or be blocked from the valve seat 130. Specifically, when the valve core 200 moves to the open state of the valve seat 130, the flow port is connected to the valve seat 130; when the valve core 200 moves to the closed state of the valve seat 130, the flow port is blocked from the valve seat 130.

[0047] Specifically, such as Figure 1 and Figure 2As shown, one end of the first half-valve body 110 is provided with a flow port, and the other end of the first half-valve body 110 is connected to one end of the second half-valve body 120. The other end of the second half-valve body 120 is provided with a valve seat 130, and the flow port can communicate with the valve seat 130. For example, the first half-valve body 110 and the second half-valve body 120 can be connected by threads. Alternatively, in other embodiments, they can be connected by flanges. A sealing ring is provided between the mating inserts of the first half-valve body 110 and the second half-valve body 120. For example, to further improve the sealing performance, a double-stage sealing structure can be provided at the mating inserts of the first half-valve body 110 and the second half-valve body 120.

[0048] A limiting support plate 600 is snapped between the first half-valve body 110 and the second half-valve body 120. For example, a limiting platform is provided on the inner wall of the second half-valve body 120 near the first half-valve body 110. One side of the limiting support plate 600 is attached to and limited on the limiting platform. When the first half-valve body 110 is inserted into the second half-valve body 120, the end of the first half-valve body 110 can be attached to and pressed against the other side of the limiting support plate 600. The valve core body 210 is located between the limiting support plate 600 and the valve seat 130. A through hole is provided on the limiting support plate 600. One end of the valve stem 220 is connected to the side of the valve core body 210 away from the valve seat 130. The other end of the valve stem 220 extends from one side of the limiting support plate 600 through the through hole to the other side of the limiting support plate 600, and a locking member 700 is connected to the other end of the valve stem 220. For example, the axial length of the perforation on the limiting support plate 600 can be increased to extend the contact length between the valve stem 220 and the perforation wall, so that the perforation wall can provide better guidance for the valve stem 220.

[0049] The main elastic element 300 is disposed between the valve core body 210 and the limiting support plate 600. The auxiliary elastic element 400 is disposed between the locking element 700 and the limiting support plate 600. The limiting support plate 600 is provided with a flow passage area, which allows the valve seat 130 and the flow port to communicate with each other when the valve core 200 is in the open position. In this embodiment, the limiting support plate 600 not only provides guidance for the valve stem, but also cooperates with the valve core end face to limit and fix the main elastic element 300, and cooperates with the locking element 700 to limit and fix the auxiliary elastic element 400.

[0050] The above structure enables sensitive opening and closing and reliable sealing under extremely low opening pressure differential. Its dual elastic element design effectively reduces the operating pressure differential. The cooperation between the limit support plate 600 and the valve stem 220 ensures the linearity of the valve core 200 movement and the sealing alignment. The split valve body structure facilitates the assembly and maintenance of internal components, thus improving the applicability and reliability of the check valve under low pressure differential and high sensitivity conditions.

[0051] It should be noted that this utility model does not impose any specific limitations on the specific types of the main elastic element 300 and the auxiliary elastic element 400. For example, in one embodiment of this utility model, the main elastic element 300 includes: a main spring, which is sleeved on the valve stem 220 and located between the limiting support plate 600 and the valve core body 210; and an auxiliary spring, which is sleeved on the valve stem 220 and located between the locking element 700 and the limiting support plate 600. Both the main spring and the auxiliary spring are sleeved on the same valve stem 220 and are coaxially arranged to ensure the coaxiality of the forces and avoid uneven wear of the valve core body 210.

[0052] The main spring and auxiliary spring can be helical springs or magnetic springs.

[0053] In one embodiment of the present invention, the locking member 700 includes a locking nut, which is threadedly connected to the end of the valve stem 220 away from the valve core body 210.

[0054] By utilizing the rotatable nature of standard threaded parts, the on-site commissioning, maintenance, and parts replacement of check valves become extremely simple, requiring only conventional tools. This significantly reduces assembly complexity and subsequent maintenance costs, thereby improving product manufacturability and economy while ensuring performance reliability.

[0055] When the locking element 700 is set as a locking nut, it has a certain ability to adjust the preload of the auxiliary spring.

[0056] In another embodiment of the present invention, the adjusting mechanism 500 includes an adjusting nut, which is threadedly connected to the valve stem 220 and located between the locking member 700 and the auxiliary elastic member 400.

[0057] For example, a locking nut and an adjusting nut are sequentially installed at the end of the valve stem 220 away from the valve seat 130, along the direction close to the auxiliary spring. The adjusting nut serves as the preload adjustment element for the auxiliary spring. The locking nut serves as a reliable locking structure for the adjusting nut. This prevents the adjusting nut from loosening and ensures the stability of the adjusting nut's adjustment accuracy in the check valve.

[0058] The components of the check valve can be made of corrosion-resistant materials, such as stainless steel, which are suitable for corrosive media such as nitric acid solutions and can work stably under conditions not exceeding 80°C and 2MPa.

[0059] A second aspect of this invention provides a hydraulic device including the check valve described above.

[0060] For example, hydraulic devices include, but are not limited to, hydraulic locks for crane outriggers, hydraulic locks for excavator booms, and hydraulic locks for concrete pump truck booms.

[0061] Furthermore, the hydraulic device provided by this utility model, since it includes the check valve as described above, also possesses the advantages described above.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A check valve, characterized in that, include: Valve body (100), on which a valve seat (130) is formed; A valve core (200) is movably disposed within the valve body (100) and is adapted to open or close the valve seat (130). The main elastic element (300) is capable of applying a main elastic force to the valve core (200) to cause it to close. An auxiliary elastic element (400) applies an auxiliary elastic force opposite to the main elastic force to the valve core (200) to at least partially counteract the main elastic force.

2. The check valve according to claim 1, characterized in that, The check valve also includes: An adjustment mechanism (500) is connected to the auxiliary elastic element (400) and is used to adjust the auxiliary elastic force of the auxiliary elastic element (400).

3. The check valve according to claim 2, characterized in that, The check valve also includes: A limiting support plate (600) is disposed inside the valve body (100); The valve core (200) includes: Valve core body (210), the valve core body (210) is disposed between the limiting support plate (600) and the valve seat (130); A valve stem (220) is provided, one end of which is connected to the valve core body (210), and the other end of which is movably inserted through one side of the limiting support plate (600) to the other side of the limiting support plate (600).

4. The check valve according to claim 3, characterized in that, The main elastic element (300) is disposed between the limiting support plate (600) and the valve core body (210); The check valve also includes: A locking element (700) is connected to one end of the valve stem (220) away from the valve core body (210); The auxiliary elastic element (400) is disposed between the locking element (700) and the limiting support plate (600).

5. The check valve according to claim 3, characterized in that, The main elastic element (300) includes: The main spring is sleeved on the valve stem (220) and located between the limiting support plate (600) and the valve core body (210).

6. The check valve according to claim 4, characterized in that, The auxiliary elastic element (400) includes: An auxiliary spring is sleeved on the valve stem (220) and located between the locking member (700) and the limiting support plate (600).

7. The check valve according to claim 4, characterized in that, The locking element (700) includes: A locking nut is threaded to one end of the valve stem (220) away from the valve core body (210).

8. The check valve according to claim 4, characterized in that, The adjustment mechanism (500) includes: An adjusting nut, threadedly connected to the valve stem (220), is located between the locking member (700) and the auxiliary elastic member (400).

9. The check valve according to any one of claims 1 to 8, characterized in that, The valve body (100) includes: First half valve body (110); The second half valve body (120) is connected to the first half valve body (110); The valve seat (130) is provided on one of the first half valve body (110) and the second half valve body (120), and the flow port is provided on the other half valve body (110) and the second half valve body (120). The flow port and the valve seat (130) can communicate with each other or be mutually blocked.

10. A hydraulic device, characterized in that, Includes the check valve as described in any one of claims 1 to 9.

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