Pilot valve for gas circuit control

Abstract

The utility model provides a pilot valve for gas circuit control, which comprises a cylinder lower cover, a valve cover, a valve body, a valve core, a first sealing ring, a sealing bush and a coupling sleeve, the first sealing ring is embedded between the lower end of the valve core and the valve body; the sealing bush is arranged at the upper end of the valve element in a sleeving mode. The connecting sleeve is arranged on the outer side of the sealing bush and the outer side of the valve element in a sleeving mode. The valve cover is arranged at the upper end of the coupling sleeve in a sleeving manner; and the valve body is sleeved at the lower end of the coupling sleeve. Compared with a traditional pilot valve for gas circuit control, the pilot valve for gas circuit control is higher in reliability and convenient to disassemble, assemble and maintain, and meanwhile the machining requirement of a sealing face is lowered.

Description

Technical Field

[0001] The utility model belongs to the technical field of spraying equipment, and in particular relates to a pilot valve for air path control. Background Art

[0002] Patent application number CN201922091546.3 discloses a pilot control valve, as shown in the attached specification. Figure 1 As shown in the figure, it adopts integrated airway secondary seal and lossless reversing structure design. The following problems have been found in actual production over the past few years:

[0003] 1. The maintenance and repair difficulty of the on-site operator increases; especially when replacing the O-ring in the sealing guide screw, it is a small-diameter deep hole replacement;

[0004] 2. The sealing guide screw adopts a detachable thread glue connection method. During long-term operation, the thread occasionally withdraws and presses against the valve core, making the gas circuit unable to work normally, resulting in a deadlock, affecting the operator's working time and coating efficiency;

[0005] 3. During on-site use, the sealing guide screw did not withdraw, but the O-ring on the sealing guide sleeve was worn out due to long-term operation, resulting in failure of the gas circuit seal, and then equipment failure. It is difficult for general operators to disassemble, repair and replace the O-ring;

[0006] 4. In the secondary seal, the first seal adopts steel-copper hard seal, and the second seal adopts tetrafluoroethylene seal, which has extremely high requirements on the processing quality of the mutual sealing surfaces. Utility Model Content

[0007] In view of the defects of the prior art, the utility model provides a pilot valve for air path control, which has higher reliability and is convenient for disassembly and maintenance, while reducing the processing requirements for the sealing surface.

[0008] The utility model provides a pilot valve for air path control, comprising a valve cover, a valve body and a valve core, and also comprising a first sealing ring, a sealing bushing and a connecting sleeve;

[0009] The first sealing ring is embedded between the lower end of the valve core and the valve body;

[0010] The sealing bushing is sleeved on the upper end of the valve core;

[0011] The connecting sleeve is arranged on the outer sides of the sealing sleeve and the valve core;

[0012] The valve cover is sleeved on the upper end of the connecting sleeve;

[0013] The valve body is sleeved on the lower end of the connecting sleeve.

[0014] In the above technical solution, the present invention can also be improved as follows.

[0015] The preferred technical solution has the additional technical feature that a first mounting groove is arranged on the end surface of the sealing sleeve facing the valve core, a second sealing ring is arranged in the first mounting groove, and the second sealing ring is tightly attached to the sealing sleeve and the valve core.

[0016] The preferred technical solution has the additional technical feature that a second mounting groove is provided on the end surface of the sealing sleeve facing the coupling sleeve, a third sealing ring is provided in the second mounting groove, and the third sealing ring is in tight contact with the sealing sleeve and the coupling sleeve.

[0017] The preferred technical solution has the additional technical feature that a third mounting groove is arranged on the end surface of the coupling sleeve facing the valve core, a fourth sealing ring is arranged in the third mounting groove, and the fourth sealing ring is in close contact with the coupling sleeve and the valve core.

[0018] The preferred technical solution has the additional technical feature that a fourth mounting groove is provided on the end surface of the coupling sleeve facing the valve body, a fifth sealing ring is provided in the fourth mounting groove, and the fifth sealing ring is in close contact with the coupling sleeve and the valve body.

[0019] The preferred technical solution has the additional technical feature of further comprising a spring, wherein the lower end of the spring is crimped to the horizontal end surface of the lower end of the valve core, and the upper end of the spring is crimped to the lower end of the connecting sleeve.

[0020] The preferred technical solution has the additional technical feature that it also includes a cylinder lower cover, and the valve body and the cylinder lower cover are fixedly connected by bolts.

[0021] The preferred technical solution has the additional technical feature that a first air passage and a second air passage are provided at the lower end of the cylinder lower cover, and the axial direction of the second air passage is perpendicular to the axial direction of the valve core.

[0022] The preferred technical solution has the additional technical feature that: the hollow portion at the lower end of the valve core is connected to a third air channel, and the angle between the axial direction of the third air channel and the axial direction of the valve core is 40°-50°.

[0023] The preferred technical solution has an additional technical feature in that a fourth air channel is vertically provided at the upper end of the valve core.

[0024] The beneficial effects of the utility model are as follows: the utility model eliminates the problem of thread withdrawal that may be caused by the provision of a first sealing ring, a sealing bushing and a connecting sleeve, and eliminates the sealing guide screw; at the same time, the utility model is easy to disassemble and assemble, adopts a three-section structure, and the length of the connecting sleeve is shortened, thus solving the problem of inconvenient disassembly and assembly of some sealing rings; and adopts an embedded sealing structure, and installs a first sealing ring of the embedded structure on the lower end surface of the valve core. The first sealing ring can be made of polyurethane material, has good elasticity, and moves synchronously with the valve core; because it is an elastic material, the machining accuracy requirement of the sealing surface is greatly reduced, and the reliability of the seal is also improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0026] Figure 1 It is a schematic diagram of the structure of a pilot valve for air path control mentioned in the prior art.

[0027] Figure 2 The utility model is a schematic diagram of the structure of a pilot valve for air circuit control according to an embodiment of the utility model.

[0028] Figure 3 It is another structural schematic diagram of a pilot valve for air circuit control according to an embodiment of the utility model.

[0029] In the figure, the meanings of each mark are as follows:

[0030] 1. Cylinder lower cover; 11. First air duct; 12. Second air duct; 2. Valve cover; 3. Valve body; 4. Valve core; 41. Third air duct; 42. Fourth air duct; 5. First sealing ring; 6. Sealing bushing; 61. Second sealing ring; 62. Third sealing ring; 7. Connecting sleeve; 71. Fourth sealing ring; 72. Fifth sealing ring; 8. Spring. DETAILED DESCRIPTION

[0031] In order to further understand the content, features and effects of the utility model, the following embodiments are given and described in detail as follows:

[0032] See also Figures 2 to 3 , this embodiment provides a pilot valve for air path control, including a valve cover 2, a valve body 3 and a valve core 4, and also includes a first sealing ring 5, a sealing bushing 6 and a coupling sleeve 7;

[0033] The first sealing ring 5 is embedded between the lower end of the valve core 4 and the valve body 3;

[0034] The sealing bushing 6 is sleeved on the upper end of the valve core 4;

[0035] The coupling sleeve 7 is sleeved on the outer sides of the sealing sleeve 6 and the valve core 4;

[0036] The valve cover 2 is sleeved on the upper end of the connecting sleeve 7;

[0037] The valve body 3 is sleeved on the lower end of the connecting sleeve 7 .

[0038] In the above technical solution, this embodiment can also be improved as follows.

[0039] See also Figures 2 to 3 A first mounting groove is formed on the end surface of the sealing sleeve 6 facing the valve core 4 , a second sealing ring 61 is formed in the first mounting groove, and the second sealing ring 61 is in close contact with the sealing sleeve 6 and the valve core 4 .

[0040] See also Figures 2 to 3 A second mounting groove is formed on the end surface of the sealing bushing 6 facing the connecting sleeve 7 , and a third sealing ring 62 is formed in the second mounting groove. The third sealing ring 62 is in close contact with the sealing bushing 6 and the connecting sleeve 7 .

[0041] See also Figures 2 to 3 A third mounting groove is formed on the end surface of the coupling sleeve 7 facing the valve core 4 , and a fourth sealing ring 71 is formed in the third mounting groove. The fourth sealing ring 71 is in close contact with the coupling sleeve 7 and the valve core 4 .

[0042] See also Figures 2 to 3 A fourth mounting groove is formed on the end surface of the coupling sleeve 7 facing the valve body 3 , and a fifth sealing ring 72 is formed in the fourth mounting groove. The fifth sealing ring 72 is in close contact with the coupling sleeve 7 and the valve body 3 .

[0043] See also Figures 2 to 3 , and also includes a spring 8, the lower end of the spring 8 is crimped to the horizontal end surface of the lower end of the valve core 4, and the upper end of the spring 8 is crimped to the lower end of the connecting sleeve 7.

[0044] See also Figures 2 to 3 , and also includes a cylinder lower cover 1, and the valve body 3 is fixedly connected to the cylinder lower cover 1 by bolts.

[0045] See also Figures 2 to 3 A first air passage 11 and a second air passage 12 are provided at the lower end of the cylinder lower cover 1 , and the axial direction of the second air passage 12 is perpendicular to the axial direction of the valve core 4 .

[0046] See also Figures 2 to 3The hollow portion at the lower end of the valve core 4 is connected to a third air passage 41 , and the angle between the axis direction of the third air passage 41 and the axis direction of the valve core 4 is 40°-50°.

[0047] See also Figures 2 to 3 A fourth air passage 42 is vertically provided at the upper end of the valve core 4 .

[0048] This embodiment provides a first sealing ring 5, a sealing bushing 6 and a connecting sleeve 7, and eliminates the problem of thread withdrawal that may be caused by the sealing guide screw. At the same time, it is easy to disassemble and assemble, adopts a three-section structure, and the length of the connecting sleeve 7 is shortened, thus solving the problem of inconvenient disassembly and assembly of some sealing rings. In addition, an embedded sealing structure is adopted, and the first sealing ring 5 of the embedded structure is installed on the lower end surface of the valve core 4. The first sealing ring 5 can be made of polyurethane material, which has good elasticity and moves synchronously with the valve core 4. Since it is an elastic material, the machining accuracy requirement of the sealing surface is greatly reduced, and the reliability of the seal is also improved.

[0049] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0051] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technical personnel in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, technical staff in this field can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction. Although the embodiments of the utility model have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the utility model. Ordinary technical staff in this field can change, modify, replace and modify the above embodiments within the scope of the utility model.

Claims

1. A pilot valve for air path control, comprising a valve cover, a valve body and a valve core, characterized in that: It also includes a first sealing ring, a sealing bushing and a coupling sleeve; The first sealing ring is embedded between the lower end of the valve core and the valve body; The sealing bushing is sleeved on the upper end of the valve core; The connecting sleeve is arranged on the outer sides of the sealing sleeve and the valve core; The valve cover is sleeved on the upper end of the connecting sleeve; The valve body is sleeved on the lower end of the connecting sleeve.

2. A pilot valve for air path control according to claim 1, characterized in that: A first mounting groove is formed on the end surface of the sealing sleeve facing the valve core, a second sealing ring is formed in the first mounting groove, and the second sealing ring is in close contact with the sealing sleeve and the valve core.

3. The pilot valve for air path control according to claim 1, characterized in that: A second mounting groove is formed on the end surface of the sealing bushing facing the coupling sleeve, a third sealing ring is formed in the second mounting groove, and the third sealing ring is in close contact with the sealing bushing and the coupling sleeve.

4. The pilot valve for air path control according to claim 1, characterized in that: A third mounting groove is arranged on the end surface of the coupling sleeve facing the valve core, a fourth sealing ring is arranged in the third mounting groove, and the fourth sealing ring is in close contact with the coupling sleeve and the valve core.

5. The pilot valve for air path control according to claim 1, characterized in that: A fourth mounting groove is formed on the end surface of the coupling sleeve facing the valve body, a fifth sealing ring is formed in the fourth mounting groove, and the fifth sealing ring is in close contact with the coupling sleeve and the valve body.

6. The pilot valve for air path control according to claim 1, characterized in that: It also includes a spring, the lower end of which is pressed against the horizontal end surface of the lower end of the valve core, and the upper end of which is pressed against the lower end of the connecting sleeve.

7. The pilot valve for air path control according to claim 1, characterized in that: It also includes a cylinder lower cover, and the valve body and the cylinder lower cover are fixedly connected by bolts.

8. A pilot valve for air path control according to claim 7, characterized in that: A first air passage and a second air passage are provided at the lower end of the cylinder lower cover, and the axial direction of the second air passage is perpendicular to the axial direction of the valve core.

9. The pilot valve for air path control according to claim 1, characterized in that: The hollow portion at the lower end of the valve core is connected to a third air passage, and the angle between the axial direction of the third air passage and the axial direction of the valve core is 40°-50°.

10. The pilot valve for air path control according to claim 1, characterized in that: A fourth air channel is vertically arranged at the upper end of the valve core.

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