An electromagnetic valve

Abstract

The utility model discloses an electromagnetic valve, include: valve body, valve sleeve and valve rod, valve body is provided with valve cavity, and valve sleeve installs in the valve cavity, and valve rod is inserted in the valve sleeve, valve body is provided with at least two passages, and at least two groups of through -holes are provided on the valve sleeve, and each group of through -holes correspond with the passage one to one, at least two sealing rings are provided on the valve rod, and the linear diameter of sealing ring is greater than the aperture of through -hole, and sealing ring and the inner side wall of valve sleeve slide and abut, are used for the partial or whole group's through -hole partition isolation, to change the intercommunication relation between each passage. The utility model embodiment changes the friction contact surface of sealing ring in traditional design through the collaborative design of the valve sleeve and multiple groups of through -holes, and the small aperture's through -hole is connected to the large aperture's passage, can reduce the violent deformation and friction loss of sealing ring and valve cavity inner wall especially passage corner edge when valve rod moves, has improved the fluency of valve rod when moving, has prolonged the service life of sealing ring.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic valve technology, and in particular to an electromagnetic valve. Background Technology

[0002] A solenoid valve is a basic automated component that uses electromagnetic force to control the flow direction, flow rate, or on / off state of fluids (gas, liquid, etc.). Essentially, it converts electrical signals into mechanical motion, which then controls the opening and closing of fluid passages. During operation, a solenoid valve switches between different inlet and outlet ports by controlling the movement of the valve stem (valve core) within the valve chamber. Different passages or chambers are isolated and sealed using sealing rings mounted on the valve stem (valve core).

[0003] The sealing rings of existing solenoid valves are usually made of elastic material. The sealing rings are press-fitted against the inner wall of the valve cavity and slide against the inner wall of the valve cavity as the valve stem (valve core) moves back and forth. When passing the port or one edge of the corner where the valve cavity is connected to the inlet and outlet air passages, the sealing ring will expand and recover from the flattened state. When passing the other edge of the port or corner where the valve cavity is connected to the inlet and outlet air passages, the sealing ring will be flattened again before it can be squeezed back into the valve cavity.

[0004] During the reciprocating movement of the valve stem (valve core), it is necessary to frequently and repeatedly overcome the elasticity of the sealing ring itself to cause it to undergo elastic deformation. However, this process of repeatedly deforming the sealing ring by squeezing and friction is more intense than the sliding friction process between the sealing ring and the inner wall of the valve cavity. The frictional force generated on the sealing ring is also greater, which can easily cause the valve stem (valve core) to jam during movement and reduce the execution speed. Furthermore, the sealing ring is easily worn down quickly, reducing the sealing performance and service life. Utility Model Content

[0005] In view of this, the present invention provides a solenoid valve to solve the problem that in the prior art, the valve stem (valve core) of the solenoid valve is prone to jamming due to frequent scraping of the sealing ring when it moves, and the sealing ring is rapidly worn.

[0006] To achieve one or more of the above objectives or other objectives, this utility model proposes: a solenoid valve, comprising: a valve body, a valve sleeve, and a valve stem, wherein the valve body extends axially and is provided with a valve cavity, the valve sleeve is coaxially installed in the valve cavity, and the valve stem is axially slidably inserted into the valve sleeve; The valve body is provided with at least two passages extending radially, and the circumferential sidewall of the valve sleeve is provided with at least two sets of through holes spaced axially, each set of through holes corresponding to one of the passages, for connecting their respective passages to the valve cavity; At least two sealing rings are provided axially spaced on the valve stem. The diameter of the sealing ring is larger than the diameter of the through hole. The sealing ring slides against the inner wall of the valve sleeve to isolate some or all of the through holes, thereby changing the connection between the various passages.

[0007] Preferably, the edges of the through hole are provided with a rounded corner transition structure.

[0008] Preferably, each group of through holes is evenly distributed around the circumference of the valve sleeve.

[0009] Preferably, the valve stem is a sliding valve core, and a return spring is provided at the inner end of the valve cavity, with the inner end of the valve stem abutting against the outer end of the return spring.

[0010] Preferably, a pilot valve is installed on the valve body, and the actuating end of the pilot valve is connected to the outer end of the valve stem.

[0011] Preferably, the number of passages is five, and the five passages correspond to an inlet hole, a first outlet hole, a second outlet hole, a first outlet port, and a second outlet port, respectively. The inlet hole is used to receive the fluid medium, the first outlet hole and the second outlet hole are used to discharge the fluid medium, and the first outlet port and the second outlet port are used to connect to an actuator, which is a cylinder or a hydraulic cylinder.

[0012] Preferably, the first outlet and the second outlet are located on one side of the valve body, and the inlet hole, the first outlet hole, and the second outlet hole are located on the opposite side of the valve body, with the inlet hole located between the first outlet hole and the second outlet hole.

[0013] Preferably, the valve stem has a first working position and a second working position: when the valve stem is in the first working position, the inlet hole is connected to the first outlet hole, and the second outlet hole is connected to the second drain hole; when the valve stem is in the second working position, the inlet hole is connected to the second outlet hole, and the first outlet hole is connected to the first drain hole.

[0014] Preferably, five sets of through holes are provided, and the five sets of through holes are evenly spaced along the axial direction of the valve sleeve, corresponding one-to-one with the inlet hole, the first outlet hole, the second outlet hole, the first outlet, and the second outlet.

[0015] Preferably, two sealing rings are provided, and the distance between the two sealing rings is equal to twice the distance between two adjacent sets of through holes. The two sealing rings can divide the five sets of through holes into three independent areas to accommodate the connection requirements of the valve stem to different groups of passages in different working positions: when the valve stem is in the first working position, the two sealing rings are respectively located between the first outlet and the first drain hole, and between the second outlet and the inlet hole; when the valve stem is in the second working position, the two sealing rings are respectively located between the first outlet and the inlet hole, and between the second outlet and the second drain hole.

[0016] Implementing the embodiments of this utility model will have the following beneficial effects: By adopting the above-mentioned solenoid valve, the coordinated design of the valve sleeve and multiple sets of through holes changes the friction contact surface of the sealing ring in the traditional design. The small-diameter through holes connect the large-diameter passage, which can reduce the severe deformation and friction loss between the sealing ring and the inner wall of the valve cavity, especially the corner edge of the passage, when the valve stem moves. This makes the deformation of the sealing ring smoother when it passes the edge of the through hole, which can reduce jamming, improve the smoothness of the valve stem during movement, reduce wear, and extend the service life of the sealing ring. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] in: Figure 1 This is a schematic diagram of the overall structure of the solenoid valve proposed in this utility model; Figure 2 This is an exploded structural diagram of the solenoid valve proposed in this utility model; Figure 3 This is a top view of the solenoid valve proposed in this utility model; Figure 4 In the first embodiment of this utility model, the solenoid valve moves along the valve stem when the valve stem is in the first working position. Figure 3 A cross-sectional view along the AA direction; Figure 5 In the first embodiment of this utility model, the solenoid valve moves along the valve stem when the valve stem is in the second working position. Figure 3 A cross-sectional view along the AA direction; Figure 6In the fourth embodiment of this utility model, the solenoid valve moves along the valve stem when the valve stem is in the third working position. Figure 3 A cross-sectional view along the AA direction.

[0019] Reference numerals: 10, valve body; 11, valve cavity; 12, passage; 13, return spring; 20, valve sleeve; 21, through hole; 30, valve stem; 31, sealing ring; 40, pilot valve; P, inlet hole; R, first drain hole; S, second drain hole; A, first outlet; B, second outlet. Detailed Implementation

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects, not to describe a particular order.

[0021] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0022] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0023] like Figure 1-6 The image shown is an embodiment provided by this utility model.

[0024] This utility model embodiment provides a solenoid valve, such as Figure 1-3As shown, the valve includes: a valve body 10, a valve sleeve 20, and a valve stem 30. The valve body 10 is made by an integrated die-casting process, and its material can be copper, stainless steel, cast iron, plastic, or aluminum alloy, etc. The valve body 10 extends axially and has a valve cavity 11, which is a cylindrical cavity. The valve sleeve 20 is coaxially installed in the valve cavity 11, and the outer diameter of the valve sleeve 20 is interference-fitted with the inner diameter of the valve cavity 11, with a fit clearance ≤0.02mm, to ensure that the valve sleeve 20 is fixed without loosening. The valve stem 30 is slidably inserted into the valve sleeve 20 along the axial direction. The valve stem 30 can be made of stainless steel, copper alloy, aluminum alloy, engineering plastic, or ceramic, etc.

[0025] The valve body 10 is provided with at least two passages 12 extending radially. The passages 12 are generally cylindrical channels. The outer end of the passages 12 extends outward through the valve body 10. The circumferential sidewall of the valve sleeve 20 is provided with at least two sets of through holes 21 spaced axially. The inner end of each set of through holes 21 corresponds to one of the passages 12, and is used to connect the corresponding passages 12 to the valve cavity 11. That is, each passage 12 needs to be connected to the valve cavity 11 through the through hole 21 at its corresponding position. At least two sealing rings 31 are axially spaced on the valve stem 30. The sealing rings 31 are elastic seals and can be made of fluororubber with a Shore hardness of 70-80 degrees, combining elasticity and wear resistance. The wire diameter of the sealing ring 31 is larger than the diameter of the through hole 21. The wire diameter of the sealing ring 31 refers to the cross-sectional diameter of the sealing ring 31 in its natural state. The wire diameter is 0.3-0.5 mm larger than the hole diameter, so that the sealing ring 31 can completely cover the through hole 21 for sealing when necessary. The sealing ring 31 slides against the inner wall of the valve sleeve 20 to isolate some or all of the groups of through holes 21, dividing the internal space of the valve sleeve 20 into multiple independent chambers to change the communication relationship between the various passages 12.

[0026] Furthermore, the edge of the through hole 21 is provided with a rounded transition structure (not shown in the attached figure), with a rounded radius of 0.5-1.5mm. This structure can prevent the sealing ring 31 from being scratched or violently squeezed by sharp edges when passing through the edge of the through hole 21, making the deformation process of the sealing ring 31 smoother and significantly reducing frictional resistance. Figure 2 As shown, each group of through holes 21 contains 10-50 through holes 21. Each group of through holes 21 is evenly distributed around the circumference of the valve sleeve 20. The large number of small-diameter through holes 21 can not only ensure the flow efficiency of fluid between the passage 12 and the valve cavity 11 and avoid pressure loss caused by excessive local flow velocity, but also play a certain filtering role for impurities in the fluid.

[0027] Specifically, such as Figure 3-6As shown, the valve stem 30 is a sliding valve core, with its outer diameter fitting with the inner diameter of the valve sleeve 20. The clearance width is adapted to the wire diameter of the sealing ring 31, ensuring smooth sliding while preventing fluid leakage. A return spring 13 is installed at the inner end of the valve cavity 11. The return spring 13 is a cylindrical helical compression spring. The inner end of the valve stem 30 abuts against the outer end of the return spring 13. When the driving force at the outer end of the valve stem 30 disappears, the return spring 13 can push the valve stem 30 to automatically return to the initial position. To achieve precise control, a pilot valve 40 is installed on the valve body 10. The actuator of the pilot valve 40 is connected to the outer end of the valve stem 30 via a pin. During operation, the pilot valve 40 receives an electrical signal and generates electromagnetic force, pushing the pin to press against the valve stem 30 and move against the elastic force of the return spring 13. When the electrical signal is disconnected, the electromagnetic force of the pilot valve 40 disappears, and the return spring 13 drives the valve stem 30 to reset, realizing the switching of the working position of the valve stem 30.

[0028] By adopting the solenoid valve provided in this embodiment of the utility model, the coordinated design of the valve sleeve 20 and multiple sets of through holes 21 changes the friction contact surface of the sealing ring 31 in the traditional design. The small-diameter through hole 21 connects the large-diameter passage 12, which can reduce the severe deformation and friction loss of the sealing ring 31 and the inner wall of the valve cavity 11, especially the corner edge of the passage 12, when the valve stem 30 moves. This solves the problem of excessive frictional resistance caused by the frequent "flattening-expansion" of the sealing ring 31 in the prior art. The design of the sealing ring 31 having a wire diameter larger than the diameter of the through hole 21 ensures the sealing and isolation effect while preventing the sealing ring 31 from getting stuck in the through hole 21 and causing scratching. This makes the deformation of the sealing ring 31 smooth when passing through the edge of the through hole 21, which can reduce jamming, improve the smoothness of the valve stem 30 during movement, reduce wear, and extend the service life of the sealing ring 31.

[0029] In the first embodiment, such as Figure 1-5 As shown, the solenoid valve is a two-position five-way solenoid valve with five passages 12. The five passages 12 correspond to the inlet port P, the first outlet port R, the second outlet port S, the first outlet port A, and the second outlet port B, respectively. The inlet port P is used to connect to the fluid medium, such as compressed air or hydraulic oil, and is connected to an external air source or hydraulic pump. The first outlet port R and the second outlet port S are used to discharge the fluid medium and are usually connected to a muffler or return oil tank. The first outlet port A and the second outlet port B are used to connect to the actuator to control the extension and retraction of the actuator. The actuator is a cylinder or a hydraulic cylinder, which can be selected according to the fluid medium connected.

[0030] In this embodiment, the first outlet A and the second outlet B are arranged side by side along the axial direction of the valve body 10 on one side of the valve body 10. The inlet hole P, the first outlet hole R, and the second outlet hole S are arranged side by side along the axial direction of the valve body 10 on the opposite side of the valve body 10, with the inlet hole P located between the first outlet hole R and the second outlet hole S. The extended axis of the first outlet A is located between the first outlet hole R and the inlet hole P, and the extended axis of the second outlet B is located between the inlet hole P and the second outlet hole S. The inlet hole P, the first outlet hole R, the second outlet hole S, the first outlet A, and the second outlet B are arranged in a staggered manner, which is neat and convenient for pipeline connection. Correspondingly, five sets of through holes 21 are provided. The five sets of through holes 21 are evenly distributed along the axial direction of the valve sleeve 20, and correspond one-to-one with the inlet hole P, the first outlet hole R, the second outlet hole S, the first outlet A, and the second outlet B.

[0031] Specifically, the valve stem 30 has a first working position and a second working position. Generally speaking, the first working position is the initial position of the valve stem 30, that is, the position where the valve stem 30 is not moved towards the inner end of the valve cavity 11. At this time, the return spring 13 is in an uncompressed state. The second working position is the position where the valve stem 30 moves to the innermost end of the valve cavity 11. At this time, the return spring 13 is in a compressed state. Figure 4 As shown, when the valve stem 30 is in the first working position, the inlet hole P and the first outlet hole A are respectively connected to the inner cavity of the valve sleeve 20 through the corresponding through holes 21, and the second outlet hole B and the second drain hole S are respectively connected to the inner cavity of the valve sleeve 20 through the corresponding through holes 21, thereby indirectly connecting the inlet hole P to the first outlet hole A and the second outlet hole B to the second drain hole S; Figure 5 As shown, when the valve stem 30 is in the second working position, the inlet hole P and the second outlet hole B are connected to the inner cavity of the valve sleeve 20 through the through hole 21 at their respective positions, and the first outlet hole A and the first drain hole R are connected to the inner cavity of the valve sleeve 20 through the through hole 21 at their respective positions, thereby indirectly connecting the inlet hole P with the second outlet hole B and the first outlet hole A with the first drain hole R.

[0032] Specifically, such as Figure 3-5As shown, two sealing rings 31 are provided. The distance between the two sealing rings 31 is equal to twice the distance between two adjacent sets of through holes 21. For example, if the distance between adjacent through holes 21 is 8mm, the distance between the sealing rings 31 is 16mm. The two sealing rings 31 can divide the five sets of through holes 21 into three independent areas, or they can just block two sets of non-adjacent through holes 21 to adapt to the connection requirements of the valve stem 30 for different groups of passages 12 in different working positions: when the valve stem 30 is in the first working position, the two sealing rings 31 are respectively located between the first outlet A and the first drain hole R (that is, between the through hole 21 corresponding to the first outlet A and the through hole 21 corresponding to the first drain hole R), and between the second outlet B and the inlet. The flow holes P are located between the through holes 21 corresponding to the second outlet B and the through holes 21 corresponding to the inlet hole P, so that the inlet hole P is connected to the first outlet A and the second outlet B is connected to the second drain hole S. When the valve stem 30 is in the second working position, the two sealing rings 31 are located between the first outlet A and the inlet hole P (that is, between the through holes 21 corresponding to the first outlet A and the through holes 21 corresponding to the inlet hole P) and between the second outlet B and the second drain hole S (that is, between the through holes 21 corresponding to the second outlet B and the through holes 21 corresponding to the second drain hole S), so that the inlet hole P is connected to the second outlet B and the first outlet A is connected to the first drain hole R.

[0033] In the second embodiment, the solenoid valve is a two-position, two-way solenoid valve (not shown in the attached drawings). Correspondingly, the number of passages 12 is set to two, namely an inlet port P and a first outlet port R. The valve sleeve 20 is provided with two sets of through holes 21, corresponding to the inlet port P and the first outlet port R respectively. A sealing ring 31 is provided on the valve stem 30, and a return spring 13 is provided at one end of the valve cavity 11, while a pilot valve 40 is installed at the other end. When there is no power, the return spring 13 pushes the valve stem 30 to isolate the two sets of through holes 21 with the sealing ring 31, thus disconnecting the inlet port P and the first outlet port R. When energized, the pilot valve 40 drives the valve stem 30 to move, and the sealing ring 31 shifts, connecting the inlet port P and the first outlet port R, thereby achieving fluid flow control.

[0034] In the third embodiment, the solenoid valve is a two-position three-way solenoid valve (not shown in the attached drawings). Accordingly, the number of passages 12 is set to three, namely an inlet port P, a first outlet port A, and a first drain port R. The valve sleeve 20 is provided with three sets of through holes 21, distributed axially at intervals of 8 mm. The valve stem 30 is provided with two sealing rings 31, spaced 16 mm apart. A return spring 13 is provided at one end of the valve cavity 11, and a pilot valve 40 is installed at the other end. When there is no power, the return spring 13 pushes the valve stem 30, realizing the connection between the inlet port P and the first drain port R and the closure of the first outlet port A. When energized, the pilot valve 40 drives the valve stem 30 to move, realizing the connection between the inlet port P and the first outlet port A and the closure of the first drain port R. This can be used to control the extension and retraction of a single-acting cylinder.

[0035] In the fourth embodiment, the solenoid valve is a three-position five-way solenoid valve, such as... Figure 6 As shown, the number of passages 12 is set to five. The setting of passages 12, through holes 21, and sealing rings 31 are the same as those of the two-position five-way solenoid valve in the first embodiment. The difference is that the valve stem 30 adds a third working position. In the third working position, the valve stem 30 is located in the middle of the inner cavity of the valve sleeve 20. At this time, the two sealing rings 31 are just blocking the through holes 21 corresponding to the first outlet A and the second outlet B, respectively, which can simultaneously isolate and block all passages 12.

[0036] Obviously, the embodiments described above are only some embodiments of this utility model, not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. A solenoid valve, characterized in that, include: The valve body (10), valve sleeve (20) and valve stem (30) are provided. The valve body (10) extends axially and is provided with a valve cavity (11). The valve sleeve (20) is coaxially installed in the valve cavity (11). The valve stem (30) is slidably inserted into the valve sleeve (20) axially. The valve body (10) is provided with at least two passages (12) extending radially. The circumferential sidewall of the valve sleeve (20) is provided with at least two sets of through holes (21) spaced axially. Each set of through holes (21) corresponds to one of the passages (12) and is used to connect the corresponding passages (12) to the valve cavity (11). At least two sealing rings (31) are provided axially at intervals on the valve stem (30). The diameter of the sealing ring (31) is larger than the diameter of the through hole (21). The sealing ring (31) slides against the inner wall of the valve sleeve (20) to isolate some or all of the through holes (21) in order to change the connection relationship between each passage (12).

2. The solenoid valve according to claim 1, characterized in that, The edges of the through hole (21) are provided with a rounded corner transition structure.

3. The solenoid valve according to claim 1, characterized in that, Each set of through holes (21) is evenly distributed around the circumference of the valve sleeve (20).

4. The solenoid valve according to claim 1, characterized in that, The valve stem (30) is a sliding valve core, and a return spring (13) is provided at the inner end of the valve cavity (11). The inner end of the valve stem (30) abuts against the outer end of the return spring (13).

5. The solenoid valve according to claim 4, characterized in that, A pilot valve (40) is installed on the valve body (10), and the actuating end of the pilot valve (40) is connected to the outer end of the valve stem (30).

6. The solenoid valve according to claim 1, characterized in that, The number of passages (12) is five, and the five passages (12) correspond to the inlet hole (P), the first outlet hole (R), the second outlet hole (S), the first outlet (A), and the second outlet (B), respectively. The inlet hole (P) is used to receive the fluid medium, the first outlet hole (R) and the second outlet hole (S) are used to discharge the fluid medium, and the first outlet (A) and the second outlet (B) are used to connect to the actuator, which is a cylinder or a hydraulic cylinder.

7. The solenoid valve according to claim 6, characterized in that, The first outlet (A) and the second outlet (B) are located on one side of the valve body (10), and the inlet hole (P), the first outlet hole (R), and the second outlet hole (S) are located on the opposite side of the valve body (10), with the inlet hole (P) located between the first outlet hole (R) and the second outlet hole (S).

8. The solenoid valve according to claim 7, characterized in that, The valve stem (30) has a first working position and a second working position: when the valve stem (30) is in the first working position, the inlet hole (P) is connected to the first outlet hole (A), and the second outlet hole (B) is connected to the second drain hole (S); when the valve stem (30) is in the second working position, the inlet hole (P) is connected to the second outlet hole (B), and the first outlet hole (A) is connected to the first drain hole (R).

9. The solenoid valve according to claim 8, characterized in that, The through holes (21) are provided in five groups. The five groups of through holes (21) are evenly spaced along the axial direction of the valve sleeve (20) and correspond one-to-one with the inlet hole (P), the first outlet hole (R), the second outlet hole (S), the first outlet (A), and the second outlet (B).

10. The solenoid valve according to claim 9, characterized in that, Two sealing rings (31) are provided. The distance between the two sealing rings (31) is equal to twice the distance between two adjacent sets of through holes (21). The two sealing rings (31) can divide the five sets of through holes (21) into three independent areas to adapt to the connection requirements of the valve stem (30) to different groups of passages (12) in different working positions: when the valve stem (30) is in the first working position, the two sealing rings (31) are respectively located between the first outlet (A) and the first drain hole (R) and between the second outlet (B) and the inlet hole (P); when the valve stem (30) is in the second working position, the two sealing rings (31) are respectively located between the first outlet (A) and the inlet hole (P) and between the second outlet (B) and the second drain hole (S).

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