Valve device

Abstract

The utility model discloses a valve device, which relates to the technical field of valves, and comprises a valve body with an inlet and an outlet, and an overflow channel communicated with the inlet and the outlet is formed in the valve body; the valve element, the valve seat, the first elastic piece and the second elastic piece are arranged in the valve body, the valve element is provided with a first working position and a second working position, and the valve element can move between the first working position and the second working position under the acting force of the first elastic piece and the acting force of fluid in the overflowing channel; in the process that the valve element moves to the second working position from the first working position, the valve element bears the acting force of the first elastic piece instead of bearing the acting force of the first elastic piece and the acting force of the second elastic piece. When the valve element is located at the first working position, the valve element abuts against the valve seat under the acting force of the first elastic piece so that the overflowing channel can be in a disconnected state. And the like. Multi-stage damping adjustment can be achieved, and the valve device has the automatic and timely closing function when the fluid flow or pressure of the valve device is increased to a certain degree.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field, especially valve device. BACKGROUND

[0002] In the valve technical field, the existing technical scheme mostly adopts the design mode of valve core combined with single spring. This traditional design has certain limitation, it can only realize single linear adjustment of damping, and cannot meet the requirement of flexible adjustment of damping under various complex working conditions or different demands. For example, in some systems with special requirements for valve opening speed and flow stability, single linear damping adjustment is difficult to make the valve core achieve ideal motion state under different working conditions, thereby affecting the operation efficiency and stability of the whole system.

[0003] In addition, the existing valve has obvious deficiency in safety performance. When the fluid flow or pressure through the valve increases to a certain extent, due to the lack of effective automatic control mechanism, the valve cannot be automatically and timely closed. This situation will bring many unsafe factors in many actual application scenarios. For example, in the industrial pipeline conveying system, if the fluid flow or pressure suddenly abnormally increases, and the valve cannot be timely closed, it may cause pipeline rupture, fluid leakage and other serious accidents, not only causing production interruption and equipment damage, but also threatening personnel safety; in some conveying processes involving flammable, explosive or toxic and harmful fluids, such safety hazards are more prominent, once leakage or pressure loss of control occurs, it may cause explosion, fire, poisoning and other major safety accidents, causing immeasurable loss to the environment and society.

[0004] In summary, the existing valve technology has defects in damping adjustment and safety performance, and an valve technical scheme capable of realizing multi-stage damping adjustment and having automatic and timely closing function is urgently needed to overcome the defects of the existing technology and meet the increasingly complex and strict industrial application and safety requirements. UTILITY MODEL CONTENT

[0005] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the utility model embodiment is to provide a valve device which can realize multi-stage damping adjustment and has the function of automatic and timely closing when the fluid flow or pressure of the valve device increases to a certain extent.

[0006] The specific technical scheme of the utility model embodiment is:

[0007] A valve device, the valve device comprising:

[0008] A valve body having an inlet and an outlet, a flow passage communicating the inlet and the outlet is formed in the valve body;

[0009] a valve core, a valve seat, a first elastic member and a second elastic member arranged in the valve body;

[0010] the valve core has a first working position and a second working position, and the valve core is movable between the first working position and the second working position under the action of the first elastic member and the fluid in the flow passage; during the movement of the valve core from the first working position to the second working position, the valve core is changed from bearing the action of the first elastic member to bearing the action of the first elastic member and the second elastic member;

[0011] when the valve core is in the first working position, the valve core is abutted against the valve seat under the action of the first elastic member, so that the flow passage is in a disconnected state;

[0012] when the valve core is in the second working position, the valve core is abutted against the valve body under the action of the first elastic member, the second elastic member and the fluid in the flow passage, so that the flow passage is in a disconnected state.

[0013] Preferably, the first elastic member and the second elastic member are located on the side of the valve core away from the valve seat; the two ends of the first elastic member are respectively abutted against or connected to the valve core and the valve body; when the valve core is in the second working position, one end of the second elastic member is abutted against or connected to one of the valve core and the valve body, and the other end of the second elastic member is abutted against the other one of the valve core and the valve body.

[0014] Preferably, the first elastic member and the second elastic member are located on the side of the valve seat away from the valve core; the two ends of the first elastic member are respectively connected to the valve core and the valve body; when the valve core is in the second working position, one end of the second elastic member is connected to the valve core, and the other end of the second elastic member is abutted against the valve body.

[0015] Preferably, the first elastic member is located on the side of the valve core away from the valve seat, and the other one of the second elastic members is located on the side of the valve seat away from the valve core; the two ends of the first elastic member are respectively abutted against or connected to the valve core and the valve body; when the valve core is in the second working position, one end of the second elastic member is connected to the valve core, and the other end of the second elastic member is abutted against the valve body.

[0016] or,

[0017] The second elastic member is located on the side of the valve core away from the valve seat, and the other of the first elastic members is located on the side of the valve seat away from the valve core; the two ends of the first elastic member are connected with the valve core and the valve body respectively; when the valve core is in the second working position, one end of the second elastic member is connected with or abuts against the valve core, and the other end of the second elastic member abuts against or is connected with the valve body, or one end of the second elastic member abuts against the valve core, and the other end of the second elastic member abuts against or is connected with the valve body.

[0018] Preferably, the first elastic member and the second elastic member are arranged in a sleeved manner.

[0019] Preferably, the first elastic member is a spring, and / or the second elastic member is a spring.

[0020] Preferably, when the valve core is in the first working position, the first elastic member exerts a first preset force on the valve core; when the valve core is in the second working position, the first elastic member and the second elastic member exert a second preset force on the valve core; the second preset force is greater than the first preset force.

[0021] Preferably, the valve core has a third working position, in which the valve core is at least partially separated from the valve seat and at least partially separated from the sealing part of the valve body, so that the flow passage is in a communication state.

[0022] Preferably, when the valve core is in the third working position, the first elastic member and the second elastic member exert a third preset force on the valve core, the third preset force being less than the second preset force and greater than the first preset force.

[0023] Preferably, when the valve core is switched from bearing the force of the first elastic member to bearing the force of the first elastic member and the second elastic member, the valve core is located at a position intermediate between the first working position and the second working position.

[0024] Preferably, when the fluid flowing through the flow passage reaches a maximum flow rate, the valve core is located at a position intermediate between the first working position and the second working position.

[0025] Preferably, the valve seat has a flow passage opening, which forms part of the flow passage.

[0026] The flow passage opening is provided with a flow passage opening sealing part, and the side of the valve core facing the valve seat is provided with a first sealing part capable of sealingly cooperating with the flow passage opening sealing part.

[0027] The second sealing part of the valve core seals with the sealing part of the valve body; when the valve core is in the third working position, the gap between the first sealing part of the valve core and the flow passage sealing part forms part of the flow passage, and the gap between the second sealing part of the valve core and the sealing part of the valve body forms part of the flow passage.

[0028] Preferably, when the valve core is in the second working position, the second sealing part of the valve core seals with the sealing part of the valve body.

[0029] Preferably, the valve core is movable in a first direction relative to the valve seat; the valve body has a first through hole extending in the first direction, and the valve core has a limiting part located in the first through hole and radially limiting the valve core to move in the first direction.

[0030] Preferably, the first sealing part of the valve core seals with the flow passage sealing part in linear sealing or face sealing;

[0031] The second sealing part of the valve core seals with the sealing part of the valve body in linear sealing or face sealing.

[0032] Preferably, a filter element for filtering the fluid flowing through is arranged in the flow passage of the valve body, and the filter element is located upstream of the valve seat.

[0033] Preferably, the valve core has a communication passage forming part of the flow passage, one end of the communication passage communicates with the outer side wall of the valve core, and the other end of the communication passage communicates with the end of the valve core away from the valve seat; the communication of one end of the communication passage with the outer side wall of the valve core is located between the limiting part and the second sealing part of the valve core.

[0034] Preferably, the communication passage includes an axial communication passage and a radial communication passage communicating with the axial communication passage;

[0035] When the first elastic member and the second elastic member are located on the side of the valve core away from the valve seat, part of the first elastic member or the second elastic member extends into the axial communication passage;

[0036] When the first elastic member is located on the side of the valve core away from the valve seat, part of the first elastic member extends into the axial communication passage;

[0037] When the second elastic member is located on the side of the valve core away from the valve seat, part of the second elastic member extends into the axial communication passage.

[0038] Preferably, the second elastic member has a damping coefficient greater than the damping coefficient of the first elastic member.

[0039] The technical scheme of the utility model has the following remarkable beneficial effects:

[0040] The valve device in the application is in the first working position when no fluid passes through the flow passage, at this time, the valve core is abutted against the valve seat under the action of the first elastic member 1 to make the flow passage in the disconnected state. When fluid passes through the flow passage, the valve core moves from the first working position to the second working position under the action force of the first elastic member and the fluid in the flow passage, and the moving degree is determined by the action force of the fluid. Generally speaking, the greater the fluid flow, the greater the pressure of the fluid on the valve core. In the process of moving from the first working position to the second working position, the valve device is in the open state, and the valve core changes from bearing the action force of the first elastic member to bearing the action force of the first elastic member and the second elastic member. When the valve core is in the second working position, the valve core is abutted against the valve body under the action force of the first elastic member, the second elastic member and the fluid in the flow passage, so as to make the flow passage in the disconnected state again. Through the above process, the valve device can make the valve core overcome the action force of the first elastic member to open under the lower fluid pressure, can ensure that the action force of the first elastic member and the second elastic member on the valve core is applied when the valve device is in the working lift range from opening to working, so as to keep the fluid output in the relatively stable flow range, can also make the valve device keep the flow passage in the disconnected state through the valve core when the pressure of the fluid is further increased, so as to play the role of automatic closing of flow limiting, and further ensure the safety. BRIEF DESCRIPTION OF DRAWINGS

[0041] The drawings described herein are only for the purpose of explanation, and are not intended to limit the scope of the utility model disclosure in any way. In addition, the shape and scale of each component in the drawing are only illustrative, which is used to help the understanding of the utility model, and is not a specific limitation on the shape and scale of each component of the utility model. Those skilled in the art can select various possible shapes and scales according to the specific circumstances to implement the utility model under the guidance of the utility model.

[0042] Figure 1 It is a sectional view of the valve device in the utility model embodiment;

[0043] Figure 2 It is an explosion view of the valve device in the utility model embodiment;

[0044] Figure 3 It is a perspective view of the valve core in another angle in the utility model embodiment;

[0045] Figure 4 It is a perspective view of the valve core in another angle in the utility model embodiment;

[0046] Figure 5 It is a structure schematic view of the second sub valve body in the embodiment of the utility model.

[0047] Figure 6 It is a structure schematic view of the valve seat in the embodiment of the utility model.

[0048] Reference signs of the above drawings:

[0049] 1, first elastic member; 2, second elastic member; 3, valve core; 31, first sealing part; 32, second sealing part; 33, communication passage; 331, axial communication passage; 332, radial communication passage; 34, limiting part; 4, valve seat; 41, flow-through port; 42, flow-through port sealing part; 5, valve body; 51, inlet; 52, outlet; 53, flow passage; 54, valve body sealing part; 55, first through hole; 56, first sub valve body; 57, second sub valve body; 6, filter core. DETAILED DESCRIPTION

[0050] The details of the utility model can be more clearly understood in combination with the description of the specific embodiment of the utility model and the drawings. However, the specific embodiment of the utility model described herein is only used for the purpose of explaining the utility model, and cannot be understood as limiting the utility model in any way. Under the guidance of the utility model, the skilled person can conceive any possible deformation based on the utility model, and these should be regarded as belonging to the scope of the utility model.

[0051] In order to realize multi-stage damping adjustment and have the function of automatic and timely closing when the fluid flow or pressure of the valve device increases to a certain extent, a valve device is provided in the application, Figure 1 It is a sectional view of the valve device in the embodiment of the utility model, Figure 2 It is an explosion view of the valve device in the embodiment of the utility model, such as Figure 1 And Figure 2As shown, the valve device can include: a valve body 5 having an inlet 51 and an outlet 52, a flow passage 53 formed in the valve body 5 and communicating the inlet 51 and the outlet 52; a valve core 3, a valve seat 4, a first elastic member 1 and a second elastic member 2 arranged in the valve body 5. The valve core 3 has a first working position and a second working position, and is movable between the first working position and the second working position under the action of the first elastic member 1 and fluid in the flow passage 53; in the process of moving from the first working position to the second working position, the valve core 3 changes from bearing the action of the first elastic member 1 to bearing the action of the first elastic member 1 and the second elastic member 2; when the valve core 3 is in the first working position, the valve core 3 abuts against the valve seat 4 under the action of the first elastic member 1 to make the flow passage 53 in a closed state; when the valve core 3 is in the second working position, the valve core 3 abuts against the valve body 5 under the action of the first elastic member 1, the second elastic member 2 and fluid in the flow passage 53 to make the flow passage 53 in a closed state.

[0052] The valve device in the present application is in the first working position when there is no fluid passing through the flow passage 53, at this time, the valve core 3 abuts against the valve seat 4 under the action of the first elastic member 1 to make the flow passage 53 in a closed state. When there is fluid passing through the flow passage 53, the valve core 3 moves from the first working position to the second working position under the action of the first elastic member 1 and fluid in the flow passage 53, and the moving degree is determined by the action of fluid in the flow passage 53. Generally speaking, the greater the fluid flow is, the greater the pressure of fluid on the valve core 3 is. In the process of moving from the first working position to the second working position, the valve device is in an open state, and the valve core 3 changes from bearing the action of the first elastic member 1 to bearing the action of the first elastic member 1 and the second elastic member 2. When the valve core 3 is in the second working position, the valve core 3 abuts against the valve body 5 under the action of the first elastic member 1, the second elastic member 2 and fluid in the flow passage 53 to make the flow passage 53 in a closed state again. Through the above process, the valve device can make the valve core 3 overcome the action of the first elastic member 1 to open at a lower fluid pressure, can ensure that the action of the first elastic member 1 and the second elastic member 2 on the valve core 3 is exerted when the valve device is in the working stroke range from opening to ensure that the fluid is output in a relatively stable flow range, and can make the valve core 3 make the flow passage 53 in a closed state when the pressure or flow of fluid further increases, thereby playing a role of automatic closing of flow limitation, and further ensuring safety.

[0053] As Figure 1As shown, the valve body 5 in this application has an outlet 52 and an inlet 51. A flow passage 53 connecting the inlet 51 and the outlet 52 is formed within the valve body 5. Fluid can flow into the valve body 5 from the inlet 51, pass through the flow passage 53, and then flow out from the outlet 52. Alternatively, the valve body 5 can be formed from a single component or from multiple connected components. The valve body 5 contains a valve core 3, a valve seat 4, a first elastic element 1, and a second elastic element 2. The valve core 3 is movable relative to the valve seat 4, thereby allowing the valve device to be in an open or closed state.

[0054] To facilitate the installation of components such as the valve core 3, valve seat 4, first elastic element 1, and second elastic element 2 into the valve body 5, preferably, as follows: Figure 1 As shown, valve body 5 can be composed of two connected parts. For example, valve body 5 may include a first sub-valve body 56 and a second sub-valve body 57. The first sub-valve body 56 and the second sub-valve body 57 can be detachably connected, such as by a threaded connection.

[0055] In one specific implementation, such as Figure 1 As shown, the first sub-valve body 56 has an inlet 51 and an open receiving space that communicates with the inlet 51. A valve seat 4 can be installed in the receiving space. The valve seat 4 can be installed into the receiving space through the open. Preferably, to ensure precise sealing or separation of the valve core 3 with the valve seat 4 during movement, the valve seat 4 can be fixed to the valve body 5. For example, the inner wall of the receiving space has internal threads, the outer wall of the valve seat 4 has external threads, and the valve seat 4 and valve body 5 are fixed by a threaded connection, which also facilitates installation between the valve seat 4 and valve body 5. Alternatively, the inner wall of the receiving space has internal threads, the outer wall of the second sub-valve body 57 has threads, at least a portion of the second sub-valve body 57 is screwed into the receiving space of the first sub-valve body 56 through the open, and the outer wall of the second sub-valve body 57 is fixed to the inner wall of the first sub-valve body 56 by a threaded connection. The valve core 3 can be located roughly between the second sub-valve body 57 and the valve seat 4, and within the accommodating space of the first sub-valve body 56.

[0056] Under the action of the first elastic element 1, the valve core 3 can abut against the valve seat 4 to keep the flow passage 53 in the open state. Figure 6 This is a schematic diagram of the valve seat structure in an embodiment of the present invention, as shown below. Figure 6 As shown, the valve seat 4 has a flow port 41, which forms a partial flow passage 53. A flow port sealing portion 42 is formed at the flow port 41, and the valve core 3 has a first sealing portion 31 on the side facing the valve seat 4, which can cooperate with the flow port sealing portion 42 to seal. The valve core 3 has a first working position. In the first working position, the valve core 3 abuts against the valve seat 4 under the action of the first elastic member 1, so that the flow passage 53 is in a disconnected state. That is to say, Figure 4As shown in the embodiment of the utility model, the perspective view of the valve core at another angle is shown in the figure, Figure 4 Under the action of the first elastic member 1, the first sealing part 31 of the valve core 3 can abut against the flow-through port sealing part 42 of the valve seat 4, so that the flow-through port 41 is sealed, and the flow-through channel 53 is in a disconnected state.

[0057] As shown in the figure, Figure 1 The valve core 3 has a second working position, when the valve core 3 is in the second working position, the valve core 3 abuts against the valve body sealing part 54 of the valve body 5, so that the flow-through channel 53 is in a disconnected state. That is to say, when the valve core 3 is in the second working position, the distance between the valve core 3 and the valve seat 4 is the maximum value of the movement of the valve core 3. At this time, the valve core 3 abuts against the valve body 5 under the action of the first elastic member 1, the second elastic member 2 and the fluid in the flow-through channel 53, so that the flow-through channel 53 is in a disconnected state.

[0058] The valve core 3 can move between the first working position and the second working position under the action of the first elastic member 1 and the fluid in the flow-through channel 53. In the process of moving from the first working position to the second working position, the valve core 3 changes from bearing the action of the first elastic member 1 to bearing the action of the first elastic member 1 and the second elastic member 2. In addition, in the above process, the action of the first elastic member 1 on the valve core 3 gradually increases. After the valve core 3 bears the action of the first elastic member 1 and the second elastic member 2, as the valve core 3 continues to move to the second working position, the action of the first elastic member 1 on the valve core 3 gradually increases, and the action of the second elastic member 2 on the valve core 3 also gradually increases.

[0059] As feasible, Figure 3 As shown in the embodiment of the utility model, the perspective view of the valve core at one angle is shown in the figure, Figure 3 The side of the valve core 3 away from the valve seat 4 has a second sealing part 32 that can cooperate with the valve body sealing part 54 to seal. When the valve core 3 is in the second working position, the second sealing part 32 of the valve core 3 cooperates with the valve body sealing part 54 to seal, so that the valve core 3 makes the flow-through channel 53 in a disconnected state.

[0060] The valve core 3 can have a third working position, when the valve core 3 is in the third working position, the valve core 3 is at least partially separated from the valve seat 4, the valve core 3 is at least partially separated from the valve body sealing part 54 of the valve body 5, so that the flow passage 53 is in a communication state, and the valve device is in an open state. Specifically, the gap between the first sealing part 31 of the valve core 3 and the flow passage sealing part 42 forms part of the flow passage 53, and the gap between the second sealing part 32 of the valve core 3 and the valve body sealing part 54 forms part of the flow passage 53, so that the valve core 3 causes the flow passage 53 to be in a communication state. The third working position of the valve core 3 is between the first working position and the second working position. When there is fluid flowing through the flow passage 53, and the fluid pressure is relatively small, the fluid only needs to overcome the force of the first elastic member 1, so that the valve core 3 is separated from the valve seat 4, so that the flow passage 53 is in a communication state. When the fluid pressure is relatively large, that is, the fluid flow is large, the distance between the valve core 3 and the valve seat 4 is further increased, and the force of the second elastic member 2 begins to act on the valve core 3, and the fluid needs to overcome the combined force of the first elastic member 1 and the second elastic member 2. At this time, the total damping coefficient of the elastic member when the valve core 3 moves is greater than the damping coefficient of the elastic member when the valve core 3 just starts to separate from the valve seat 4. Through the above process, it can be ensured that the force applied to the valve core 3 by the first elastic member 1 and the second elastic member 2 when the valve device is from open to the working lift range, so as to keep the fluid output in a relatively stable flow range.

[0061] When the valve core 3 is in the first working position, the force of the first elastic member 1 on the valve core 3 can be a first preset value. When the valve core 3 is in the second working position, the total force of the first elastic member 1 and the second elastic member 2 on the valve core 3 can be a second preset value. Among them, the second preset value is greater than the first preset value. When the valve core 3 is in the third working position, the force of the first elastic member 1 and the second elastic member 2 on the valve core 3 is a third preset value, the third preset value is less than the second preset value and greater than the first preset value. It should be noted that the third working position includes any position of the valve core 3 between the first working position and the second working position, therefore, under part of the third working position, the second elastic member has zero force on the valve core, and under part of the third working position, the second elastic member has non-zero force on the valve core.

[0062] In a preferred embodiment, when the valve core 3 changes from bearing the force of the first elastic element 1 to bearing the force of the first elastic element 1 and the second elastic element 2, the valve core 3 can be located near the middle position between the first working position and the second working position. Since the valve core 3 also bears the force of the second elastic element 2 at this time, the valve core 3 allows the fluid to be output within a relatively stable flow range when it is near this position. Furthermore, when the fluid flowing through the flow channel 53 reaches its maximum flow rate, the valve core 3 is located at the middle position between the first working position and the second working position. This ensures that the gap between the first sealing part 31 and the flow port sealing part 42 of the valve core 3 is approximately equal to the gap between the second sealing part 32 and the valve body sealing part 54, thereby allowing the fluid flowing through the flow channel 53 to reach its maximum flow rate.

[0063] In one feasible implementation, such as Figure 1 As shown, the first elastic element 1 and the second elastic element 2 are located on the side of the valve core 3 away from the valve seat 4. Both ends of the first elastic element 1 abut against or connect to the valve core 3 and the valve body 5, respectively. When the valve core 3 is in the second working position, one end of the second elastic element 2 abuts against or connects to one of the valve core 3 and the valve body 5, and the other end of the second elastic element 2 abuts against the other of the valve core 3 and the valve body 5. That is, when the valve core 3 is in the first working position, the force of the second elastic element 2 is not applied to the valve core 3. The force of the second elastic element 2 is only applied to the valve core 3 when the valve core 3 is in the second working position. In this embodiment, the aforementioned force can be understood as elastic force.

[0064] In another feasible embodiment, the first elastic element 1 and the second elastic element 2 are located on the side of the valve seat 4 opposite to the valve core 3. The two ends of the first elastic element 1 are connected to the valve core 3 and the valve body 5, respectively. When the valve core 3 is in the second working position, one end of the second elastic element 2 is connected to the valve core 3, and the other end of the second elastic element 2 abuts against the valve body 5. Similarly, when the valve core 3 is in the first working position, the force of the second elastic element 2 is not applied to the valve core 3. The force of the second elastic element 2 is only applied to the valve core 3 when the valve core 3 is in the second working position. In this embodiment, the aforementioned force can be understood as a tensile force.

[0065] In another possible embodiment, the first elastic member 1 is located on the side of the valve core 3 away from the valve seat 4, and the other of the second elastic members 2 is located on the side of the valve seat 4 away from the valve core 3. The two ends of the first elastic member 1 are respectively abutted against or connected with the valve core 3 and the valve body 5. When the valve core 3 is in the second working position, one end of the second elastic member 2 is connected with the valve core 3, and the other end of the second elastic member 2 is abutted against the valve body 5. Similarly, when the valve core 3 is in the first working position, the force of the second elastic member 2 is not applied to the valve core 3. When the valve core 3 is in the second working position, the force of the second elastic member 2 is applied to the valve core 3. In this embodiment, the force of the first elastic member 1 can be understood as the elastic force, and the force of the second elastic member 2 can be understood as the pulling force.

[0066] In another possible embodiment, the second elastic member 2 is located on the side of the valve core 3 away from the valve seat 4, and the other of the first elastic members 1 is located on the side of the valve seat 4 away from the valve core 3. The two ends of the first elastic member 1 are respectively connected with the valve core 3 and the valve body 5. When the valve core 3 is in the second working position, one end of the second elastic member 2 is connected with or abutted against the valve core 3, and the other end of the second elastic member 2 is abutted against the valve body 5, or one end of the second elastic member 2 is abutted against the valve core 3, and the other end of the second elastic member 2 is abutted against or connected with the valve body 5. Similarly, when the valve core 3 is in the first working position, the force of the second elastic member 2 is not applied to the valve core 3. When the valve core 3 is in the second working position, the force of the second elastic member 2 is applied to the valve core 3. In this embodiment, the force of the first elastic member 1 can be understood as the pulling force, and the force of the second elastic member 2 can be understood as the elastic force.

[0067] In the above-mentioned various embodiments, as shown in Figure 1 When the first elastic member 1 and the second elastic member 2 are located on the same side of the valve core 3, the first elastic member 1 and the second elastic member 2 can be arranged in a sleeved manner, which can greatly save the space occupied by the first elastic member 1 and the second elastic member 2, and can make the first elastic member 1 and the second elastic member 2 not affect each other. The sleeved arrangement can be that the diameter of one of the first elastic member 1 and the second elastic member 2 is greater than the diameter of the other, so that the one with the smaller diameter can be arranged in the other with the larger diameter, and the axes of the two can be arranged in a substantially parallel manner. Further, the axes of the two can be located on the same straight line. Of course, in other possible embodiments, the first elastic member 1 and the second elastic member 2 can also be arranged side by side, and the arrangement manner of the first elastic member 1 and the second elastic member 2 is not limited in the present application.

[0068] The valve device can be opened at a lower fluid pressure, and the valve device can ensure that the fluid is output in a relatively stable flow range from the opening to the working lift range.

[0069] Further, the damping coefficient of the second elastic member 2 can be greater than the damping coefficient of the first elastic member 1. Thus, when the fluid pressure rises to a relatively large value, the distance between the valve core 3 and the valve seat 4 is changed from the force applied to the valve core 3 by the first elastic member 1 to the force applied to the valve core 3 by the first elastic member 1 and the second elastic member 2. The valve core 3 only needs to move a small distance to be equal to the force acting on the valve core 3 under the action of the first elastic member 1 and the second elastic member 2. Thus, the opening degree between the valve core 3 and the valve seat 4 will not increase too much, which further ensures that the fluid is output in a relatively stable flow range from the opening to the working lift range, and the stable flow range can be limited to be relatively narrow.

[0070] Further, the valve device can further include a third elastic member. During movement of the valve core 3 from the first working position to the second working position, the valve core 3 is first changed from bearing the force of the first elastic member 1 to bearing the force of the first elastic member 1 and the second elastic member 2, and then is changed from bearing the force of the first elastic member 1 and the second elastic member 2 to bearing the force of the first elastic member 1, the second elastic member 2 and the third elastic member. When the valve core 3 is in the second working position, the valve core 3 is in abutment with the valve body 5 under the action of the first elastic member 1, the second elastic member 2 and the fluid in the flow passage 53, so that the flow passage 53 is in a disconnected state. Similarly, the valve device can include more elastic members. Through the above-mentioned manner, the valve core 3 can be adjusted steplessly, and the pressure of the fluid passing through the flow passage 53 increases with an increasing slope as the distance between the valve core 3 and the valve seat 4 increases.

[0071] In order to make the elastic member have less influence on the flow of the fluid in the valve device, as preferred, the first elastic member 1 can be a spring; and / or, the second elastic member 2 can be a spring. Of course, in other feasible embodiments, the first elastic member 1 and the second elastic member 2 can adopt other forms, which are not limited in the present application.

[0072] As Figure 1As shown, the valve core 3 is movable relative to the valve seat 4 in a first direction. For example, the first direction can be the axial direction of the valve body 5. The valve body 5 has a first through hole 55 extending in the first direction. The valve core 3 has a limiting portion 34 located in the first through hole 55 and radially limiting the valve core 3 to move in the first direction. The limiting portion 34 can be a guide surface formed on the outer side wall of the valve core 3, which has substantially the same radial dimension as the inner side wall of the first through hole 55, so that the valve core 3 cannot move in the radial direction of the valve core 3, but can move in the first direction, thereby preventing the valve core 3 from tilting or eccentricity when moving, and ensuring the accuracy and reliability of the sealing between the valve core 3 and the valve seat 4, and the accuracy and reliability of the sealing between the valve core 3 and the valve body 5.

[0073] In a specific embodiment, as shown in Figure 1 and Figure 5 As shown, the second sub-valve body 57 has the first through hole 55, and the outlet 52 of the valve body 5 is located in the second sub-valve body 57 and communicates with the first through hole 55. Further, the outlet 52 of the valve body 5 is located at one end of the second sub-valve body 57, and the other end of the second sub-valve body 57, i.e. the inlet of the first through hole 55, is arranged opposite to the valve seat 4. The valve body sealing portion 54 can be located at the other end of the second sub-valve body 57, i.e. the inlet of the first through hole 55. When the first elastic member 1 or the second elastic member 2 is located on the side of the valve core 3 away from the valve seat 4, the first elastic member 1 or the second elastic member 2 can be arranged in the first through hole 55. When the first elastic member 1 and the second elastic member 2 are located on the side of the valve core 3 away from the valve seat 4, the first elastic member 1 and the second elastic member 2 can be arranged in the first through hole 55.

[0074] As a possibility, the first sealing portion 31 of the valve core 3 can be linearly sealed or face sealed when in contact with the flow passage sealing portion 42. Similarly, the second sealing portion of the valve core 3 can be linearly sealed or face sealed when in contact with the valve body sealing portion 54. Generally speaking, the sealing effect of face sealing is higher than that of linear sealing in most cases, but due to the large area of the sealing surface, it is relatively easy for debris to accumulate or remain on the sealing surface, which can cause sealing to be not tight and leakage problems. Further, as shown in Figure 1 As shown, the flow passage 53 of the valve body 5 can be provided with a filter core 6 for filtering the fluid flowing therethrough, and the filter core 6 is located upstream of the valve seat 4. The filter core 6 can filter the fluid input from the inlet 51, thereby removing the debris in the fluid, effectively avoiding the problems of the first sealing portion 31 of the valve core 3 and the flow passage sealing portion 42 being not tightly sealed, and the problems of the second sealing portion and the valve body sealing portion 54 being not tightly sealed.

[0075] As a possibility, as shown in Figure 1 and Figure 3As shown, the valve core 3 has a connecting channel 33, which forms a partial flow passage 53. One end of the connecting channel 33 is connected to the outer wall of the valve core 3, and the other end of the connecting channel 33 is connected to the end of the valve core 3 facing away from the valve seat 4. The connection between one end of the connecting channel 33 and the outer wall of the valve core 3 is located between the limiting part 34 and the second sealing part of the valve core 3. With the above structure, fluid passing through the gap between the second sealing part and the valve body sealing part 54 can be guided to the outlet 52 of the valve body 5 for output. Since the limiting part 34 of the valve core 3 needs to cooperate with the inner wall of the first through hole 55 to achieve radial limiting, this part of the fluid is prevented from having to pass between the limiting part 34 of the valve core 3 and the inner wall of the first through hole 55, thereby increasing the fluid flow rate and making it unrestricted.

[0076] Furthermore, such as Figure 1 and Figure 3 As shown, the connecting channel 33 may include an axial connecting channel 331 and a radial connecting channel 332 communicating with the axial connecting channel 331. There may be multiple radial connecting channels 332, arranged circumferentially. The inlet of the radial connecting channel 332 communicates with the outer wall of the valve core 3 and is located between the limiting portion 34 and the second sealing portion of the valve core 3. The outlet of the axial connecting channel 331 communicates with the end of the valve core 3 facing away from the valve seat 4. When the first elastic member 1 and the second elastic member 2 are located on the side of the valve core 3 facing away from the valve seat 4, a portion of the first elastic member 1 or the second elastic member 2 can extend into the axial connecting channel 331. When the first elastic member 1 is located on the side of the valve core 3 facing away from the valve seat 4, a portion of the first elastic member 1 extends into the axial connecting channel 331. When the second elastic member 2 is located on the side of the valve core 3 facing away from the valve seat 4, a portion of the second elastic member 2 extends into the axial connecting channel 331.

[0077] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0078] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same and similar parts between various embodiments can be referred to each other. The above embodiments are only for illustrating the technical concept and characteristics of the utility model, and the purpose is to enable persons skilled in the art to understand the content of the utility model and implement it, and cannot limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit and essence of the utility model shall be covered within the protection scope of the utility model.

Claims

1. A valve device, characterized by The valve device comprises: a valve body having an inlet and an outlet, and a flow passage formed in the valve body and connecting the inlet and the outlet; a valve core, a valve seat, a first elastic member and a second elastic member arranged in the valve body; the valve core has a first working position and a second working position, and is movable between the first working position and the second working position under the action of the first elastic member and fluid in the flow passage; during the movement from the first working position to the second working position, the valve core is changed from bearing the action of the first elastic member to bearing the action of the first elastic member and the second elastic member; when the valve core is in the first working position, the valve core abuts against the valve seat under the action of the first elastic member, so that the flow passage is in a closed state; when the valve core is in the second working position, the valve core abuts against the valve body under the action of the first elastic member, the second elastic member and fluid in the flow passage, so that the flow passage is in a closed state.

2. The valve device according to claim 1, characterized in that The first elastic member and the second elastic member are located on a side of the valve core away from the valve seat; two ends of the first elastic member abut against or are connected with the valve core and the valve body respectively; when the valve core is in the second working position, one end of the second elastic member abuts against or is connected with one of the valve core and the valve body, and the other end of the second elastic member abuts against the other one of the valve core and the valve body.

3. The valve device of claim 1, wherein The first elastic member and the second elastic member are located on a side of the valve seat away from the valve core; two ends of the first elastic member are connected with the valve core and the valve body respectively; when the valve core is in the second working position, one end of the second elastic member is connected with the valve core, and the other end of the second elastic member abuts against the valve body.

4. The valve device of claim 1, wherein The first elastic member is located on a side of the valve core away from the valve seat, and the other one of the second elastic members is located on a side of the valve seat away from the valve core; two ends of the first elastic member abut against or are connected with the valve core and the valve body respectively; when the valve core is in the second working position, one end of the second elastic member is connected with the valve core, and the other end of the second elastic member abuts against the valve body. Alternatively, The second elastic member is located on a side of the valve core away from the valve seat, and the other one of the first elastic members is located on a side of the valve seat away from the valve core; two ends of the first elastic member are connected with the valve core and the valve body respectively; when the valve core is in the second working position, one end of the second elastic member abuts against or is connected with the valve core, and the other end of the second elastic member abuts against the valve body, or one end of the second elastic member abuts against the valve core, and the other end of the second elastic member abuts against or is connected with the valve body.

5. Valve device according to claim 2 or 3, characterized in that The first elastic member and the second elastic member are arranged in a sleeved manner.

6. The valve device of claim 1, wherein The first elastic member is a spring; and / or the second elastic member is a spring.

7. The valve device of claim 1, wherein The first elastic member exerts a first preset force on the valve core when the valve core is in the first working position; and the first elastic member and the second elastic member exert a second preset force on the valve core when the valve core is in the second working position. The second preset force is greater than the first preset force.

8. Valve device according to claim 1 or 7, characterized in that The valve core has a third working position, in which the valve core is at least partially separated from the valve seat and at least partially separated from a valve body sealing portion of the valve body, so that the flow passage is in a communication state.

9. The valve device of claim 8, wherein The first elastic member and the second elastic member exert a third preset force on the valve core when the valve core is in the third working position, the third preset force being less than the second preset force and greater than the first preset force.

10. The valve device of claim 8, wherein The valve core is located in an intermediate position between the first working position and the second working position when the valve core is switched from bearing the force of the first elastic member to bearing the forces of the first elastic member and the second elastic member.

11. The valve device of claim 10, wherein The valve core is located in an intermediate position between the first working position and the second working position when the fluid flowing through the flow passage reaches a maximum flow rate.

12. The valve device of claim 8, wherein The valve seat has a flow passage opening, which forms part of the flow passage; The flow passage opening has a flow passage opening sealing portion, and a side of the valve core facing the valve seat has a first sealing portion capable of sealingly cooperating with the flow passage opening sealing portion; A side of the valve core facing away from the valve seat has a second sealing portion capable of sealingly cooperating with the valve body sealing portion; when the valve core is in the third working position, a gap between the first sealing portion of the valve core and the flow passage opening sealing portion forms part of the flow passage, and a gap between the second sealing portion of the valve core and the valve body sealing portion forms part of the flow passage.

13. The valve device of claim 12, wherein, When the valve core is in the second working position, the second sealing portion of the valve core sealingly cooperates with the valve body sealing portion.

14. The valve device of claim 12, wherein, The valve core is movable relative to the valve seat in a first direction; the valve body has a first through hole extending in the first direction, and the valve core has a limiting portion located in the first through hole and radially limiting the valve core to move in the first direction.

15. The valve device of claim 12, wherein, The first sealing portion of the valve core sealingly cooperates with the flow passage opening sealing portion in a linear or surface sealing manner. The second sealing portion of the valve core sealingly cooperates with the valve body sealing portion in a linear or surface sealing manner.

16. The valve device of claim 15, wherein A filter element for filtering the fluid flowing through the flow passage is arranged in the flow passage of the valve body and located upstream of the valve seat.

17. The valve device of claim 14, wherein The valve core has a communication passage, which forms part of the flow passage, and one end of the communication passage communicates with an outer side wall of the valve core, and the other end of the communication passage communicates with an end portion of the side of the valve core facing away from the valve seat; the communication between the one end of the communication passage and the outer side wall of the valve core is located between the limiting portion and the second sealing portion of the valve core.

18. The valve device of claim 17, wherein, The communication passage includes an axial communication passage and a radial communication passage communicating with the axial communication passage. When the first elastic member and the second elastic member are located at the side of the spool away from the valve seat, part of the first elastic member or the second elastic member extends into the axial communication channel; When the first elastic member is located at the side of the spool away from the valve seat, part of the first elastic member extends into the axial communication channel; When the second elastic member is located at the side of the spool away from the valve seat, part of the second elastic member extends into the axial communication channel.

19. The valve device of claim 1, wherein The damping coefficient of the second elastic member is greater than the damping coefficient of the first elastic member.

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