A double sealing structure of a pilot-operated solenoid valve

Abstract

The utility model relates to the technical field of electromagnetic valve sealing, and discloses a double sealing structure of a pilot electromagnetic valve, including a valve body, a valve stem passing through the interior of the valve body, and a coil assembly sleeved on the exterior of the valve stem, a relay being arranged on one side of the coil assembly, and butt-joint pipes being installed at both ends of the valve body. The utility model improves the connection strength between the connecting pipe and the valve body through the action of the internal thread to prevent the connecting pipe from being pulled out at will, cooperates with the action of the locking frame to further tighten the end of the connecting pipe, and utilizes the internal fluid of the valve body to fill the annular groove through the connecting channel, and promotes the deformation of the locking frame to approach the connecting pipe under the action of the groove, the sealing ring and the fluid tension, so as to further improve its sealing effect, and has strong structural stability, and at the same time achieves a certain self-sealing effect, which is conducive to reducing the sealing cost of the pilot electromagnetic valve.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic valve sealing, in particular to a double sealing structure of a pilot electromagnetic valve. Background Art

[0002] Pilot solenoid valves are widely used and can be used to control the opening or closing of flow media. With the development of industrial technology, the requirements for the opening performance of pilot solenoid valves are getting higher and higher. Pilot solenoid valves generally open the valve through the pressure difference between the fluid inlet and the fluid outlet.

[0003] Chinese patent authorization announcement number CN218971958U discloses a pilot solenoid valve, including a solenoid valve structure, an adjustment structure is arranged on both sides of the solenoid valve structure, a control structure is arranged on the top of the adjustment structure, the adjustment structure includes an air storage tank, an air bag, a threading tube, and a quick-plug interface, and the control structure includes a pressure reducing valve, an air inlet, an adjustment knob, a filter tank, a heating ring, and an air pipe. At the same time, the control structure can adjust the sealing performance so that it has a more suitable sealing performance in different temperature ranges in different seasons to prevent mechanical extrusion caused by excessive sealing and leakage caused by improper sealing. The above-mentioned prior art scheme has the following shortcomings: the pilot solenoid valve mainly realizes the butt sealing between the valve body and the pipeline through the expansion of the air bag. On the one hand, due to the expansion of the air bag, it has greater elasticity, which in turn affects the connection stability between the pipeline and the valve body. On the other hand, the gas in the air bag is prone to leakage due to long-term action, so it needs to be regularly aerated, which then requires the cooperation of a gas pumping device, which leads to an increase in the cost of components of the sealing structure, so there is a certain room for improvement. Utility Model Content

[0004] The utility model aims to provide a double sealing structure of a pilot-operated solenoid valve, so as to solve the problems of the conventional pilot-operated solenoid valves mentioned in the above background technology that the sealing stability is average and the structure cost is relatively high.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a double sealing structure of a pilot electromagnetic valve, comprising a valve body, a valve stem passing through the interior of the valve body, and a coil assembly sleeved on the exterior of the valve stem, a relay being arranged on one side of the coil assembly, butt joints being arranged at both ends of the valve body, and a fluid passage being communicated between the interior of the butt joints and the valve body, an internal thread being arranged at one end of the fluid passage away from the valve body, and a screwing installation with an external connecting pipe being realized by the action of the internal thread, an annular groove being arranged at the other end of the fluid passage, and locking frames being arranged at both sides of the annular groove, sealing rings being evenly arranged on the sides of the two locking frames away from the annular groove, and a sealing mechanism being connected to the sides of the two locking frames close to the annular groove, so as to further promote the locking frames to be tightly attached to the outer wall of the connecting pipe inside the butt joint;

[0006] The sealing mechanism includes a reinforcement ring installed on the locking frame near the annular groove, and sealing rings are arranged on both sides of the top of the reinforcement ring. A groove is opened at the bottom of the reinforcement ring, and the locking frame is distributed on both sides of the groove opening. Connecting channels are evenly opened on the inner side of the annular groove, and the connecting channels are located in the inner wall of the docking tube. At the same time, one end of the connecting channel is connected to the inside of the fluid channel.

[0007] Preferably, the locking frame and the reinforcement ring are both metal elastic ring-shaped frames, and the locking frame and the reinforcement ring are integrated.

[0008] Preferably, the cross section of the locking frame is L-shaped, and the cross section of the reinforcement ring is in an inverted funnel shape.

[0009] Preferably, the cross section of the sealing ring is a right-angled trapezoid.

[0010] Preferably, the inclined surface of the sealing ring abuts against the inclined surface of the reinforcement ring, and the two right-angled surfaces of the sealing ring abut against the inner wall of the locking frame and the inner wall of the annular groove respectively to ensure the seal between the annular groove and the locking frame.

[0011] Preferably, the groove is located on the central axis of the cross section of the reinforcement ring, and the cross section of the groove is triangular.

[0012] Preferably, five sealing rings are arranged on the locking frame, and the diameters of the plurality of sealing rings gradually increase from the outer end to the inner end.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] (1) The internal thread is used to improve the connection strength between the connecting pipe and the valve body to prevent it from being pulled out at will. The locking frame is used to further tighten the end of the connecting pipe. The internal fluid of the valve body is used to fill the annular groove through the connecting channel. Under the action of the groove, the sealing ring and the fluid tension, the locking frame is promoted to deform closer to the connecting pipe to further improve its sealing effect. The structural stability is strong and a certain self-sealing effect is achieved, which is conducive to reducing the sealing cost of the pilot solenoid valve.

[0015] (2) Through the cooperation of multiple sealing rings and the screwing effect between the connecting pipe and the internal thread, the degree of connection sealing between the connecting pipe and the butt pipe can be adjusted at different screwing depths, thereby further improving the tightness and sealing effect between the connecting pipe and the valve body, and realizing double-layer sealing between the pilot solenoid valve and the connecting pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a schematic diagram of the main cross-sectional structure of the utility model;

[0018] Figure 2 For the utility model Figure 1 Schematic diagram of the structure at A in the middle;

[0019] Figure 3 It is a schematic diagram of the cross-sectional three-dimensional structure of the butt-joint pipe of the utility model;

[0020] Figure 4 It is a schematic diagram of the three-dimensional structure of the locking frame of the utility model;

[0021] Figure 5 It is a schematic diagram of the cross-sectional three-dimensional structure of the locking frame of the utility model.

[0022] Explanation of the reference numerals in the figure: 1. valve body; 2. coil assembly; 3. valve stem; 4. relay; 5. butt joint; 6. fluid channel; 7. internal thread; 8. annular groove; 9. connecting channel; 10. locking frame; 11. sealing ring; 12. groove; 13. reinforcement ring; 14. sealing ring. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-Figure 5 , the utility model provides an embodiment: a double sealing structure of a pilot solenoid valve, including a valve body 1, a valve stem 3 is penetrated inside the valve body 1, and a coil assembly 2 is sleeved outside the valve stem 3, a relay 4 is arranged on one side of the coil assembly 2, butt joints 5 are installed at both ends of the valve body 1, and a fluid channel 6 is communicated between the butt joints 5 and the valve body 1, an internal thread 7 is arranged at one end of the fluid channel 6 away from the valve body 1, and the screwing installation between the connecting pipe and the outside is realized through the action of the internal thread 7, an annular groove 8 is opened at the other end of the fluid channel 6, and locking frames 10 are clamped on both sides of the annular groove 8, and sealing rings 11 are evenly installed on the side of the two locking frames 10 away from the annular groove 8;

[0025] Five sealing rings 11 are arranged on the locking frame 10, and the diameters of the sealing rings 11 gradually increase from the outer end to the inner end;

[0026] Specifically, Figure 1 , Figure 2 and Figure 5 As shown, when in use, the sealing ring 11 is used to gradually increase the tightness of the connecting pipe as the depth of the connecting pipe 5 increases, and at the same time, the sealing effect between the connecting pipe and the butt joint 5 is improved;

[0027] A sealing mechanism is provided on one side of the two locking frames 10 close to the annular groove 8 to further facilitate the locking frames 10 to adhere tightly to the outer wall of the connecting pipe inside the butt pipe 5;

[0028] The sealing mechanism includes a reinforcing ring 13 installed on the side of the locking frame 10 close to the annular groove 8, and sealing rings 14 are arranged on both sides of the top of the reinforcing ring 13, a groove 12 is opened at the bottom of the reinforcing ring 13, and the locking frames 10 are distributed on both sides of the opening of the groove 12, and connecting channels 9 are evenly opened on the inner side of the annular groove 8, and the connecting channels 9 are located in the inner wall of the butt joint 5, and one end of the connecting channel 9 is connected to the inside of the fluid channel 6;

[0029] Specifically, Figure 1 , Figure 2 and Figure 3 , Figure 5As shown, when in use, the fluidity of the fluid in the passage of the valve body 1 is utilized to fill the gap between the annular groove 8 and the locking frame 10, and the tension thereof is utilized to promote the close contact between the locking frame 10 and the connected pipe, so as to further improve the sealing performance and achieve a double sealing effect;

[0030] The locking frame 10 and the reinforcing ring 13 are both metal elastic ring-shaped brackets, and the locking frame 10 and the reinforcing ring 13 are integrated;

[0031] The cross section of the locking frame 10 is L-shaped, and the cross section of the reinforcement ring 13 is inverted funnel-shaped;

[0032] The cross section of the sealing ring 14 is a right-angled trapezoid;

[0033] The inclined surface of the sealing ring 14 abuts against the inclined surface of the reinforcing ring 13, and the two right-angled surfaces of the sealing ring 14 abut against the inner wall of the locking frame 10 and the inner wall of the annular groove 8 respectively, so as to ensure the sealing between the annular groove 8 and the locking frame 10;

[0034] The groove 12 is located on the central axis of the cross section of the reinforcement ring 13, and the cross section of the groove 12 is triangular;

[0035] Specifically, Figure 1 , Figure 2 and Figure 4 As shown, when in use, the locking frame 10 is provided with a certain amount of flexural space by utilizing the groove 12, so that the locking frame 10 can further squeeze the outer wall of the connecting pipe to promote its sealing.

[0036] Working principle: When the utility model is used, firstly, the connecting pipe is screwed into the interior of the butt pipe 5 with the internal thread 7, so that the end of the connecting pipe abuts against the sealing ring 11. With the different screwing depths, the tightness between the connecting pipe and the sealing ring 11 gradually increases;

[0037] Secondly, the relay 4 is started to energize the coil assembly 2, and the air valve stem 3 is started, so that a passage is formed inside the valve body 1, so that the fluid flows between the connecting pipes at both ends. Since the fluid fills the inside of the valve body 1, the fluid flows along the fluid channel 6 through the connecting channel 9 and enters the inside of the annular groove 8;

[0038] Finally, the reinforcing ring 13, the sealing ring 14 and the locking frame 10 form a cavity structure inside the annular groove 8, allowing the fluid to enter the cavity structure. Due to the tension of the fluid, the reinforcing ring 13 is squeezed inwardly, and then the locking frame 10 forms an inward bending tendency under the action of the groove 12, which further promotes the locking frame 10 to be tightly attached to the outer wall of the inner connecting pipe, so as to further improve the connection tightness between the connecting pipe and the butt pipe 5, thereby achieving a further sealing effect.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A double sealing structure of a pilot-operated solenoid valve, comprising a valve body (1), characterized in that: A valve stem (3) passes through the valve body (1), and a coil assembly (2) is sleeved on the outside of the valve stem (3). A relay (4) is arranged on one side of the coil assembly (2). A butt joint (5) is installed at both ends of the valve body (1), and a fluid channel (6) is connected between the butt joint (5) and the valve body (1). An internal thread (7) is provided at one end of the fluid channel (6) away from the valve body (1), and a screwing installation with an external connecting pipe is achieved through the action of the internal thread (7). An annular groove (8) is provided at the other end of the fluid channel (6), and locking frames (10) are clamped on both sides of the annular groove (8). Sealing rings (11) are evenly installed on the sides of the two locking frames (10) away from the annular groove (8), and a sealing mechanism is connected to the sides of the two locking frames (10) close to the annular groove (8) to further promote the locking frames (10) to be tightly attached to the outer wall of the connecting pipe inside the butt joint (5); The sealing mechanism comprises a reinforcement ring (13) connected to two locking frames (10) close to one side of the annular groove (8), and sealing rings (14) are arranged on both sides of the top of the reinforcement ring (13). A groove (12) is provided at the bottom of the reinforcement ring (13), and the locking frames (10) are distributed on both sides of the opening of the groove (12). Connecting channels (9) are evenly provided on the inner side of the annular groove (8), and the connecting channels (9) are located in the inner wall of the butt joint (5), and one end of the connecting channel (9) is connected to the inside of the fluid channel (6).

2. The double sealing structure of a pilot-operated solenoid valve according to claim 1 is characterized in that: The locking frame (10) and the reinforcing ring (13) are both metal elastic annular supports, and the locking frame (10) and the reinforcing ring (13) are integrated.

3. The double sealing structure of a pilot-operated solenoid valve according to claim 1, characterized in that: The cross section of the locking frame (10) is L-shaped, and the cross section of the reinforcement ring (13) is in an inverted funnel shape.

4. The double sealing structure of a pilot-operated solenoid valve according to claim 1 is characterized in that: The cross section of the sealing ring (14) is a right-angled trapezoid.

5. The double sealing structure of a pilot-operated solenoid valve according to claim 1, characterized in that: The inclined surface of the sealing ring (14) abuts against the inclined surface of the reinforcing ring (13), and the two right-angled surfaces of the sealing ring (14) respectively abut against the inner wall of the locking frame (10) and the inner wall of the annular groove (8) to ensure the seal between the annular groove (8) and the locking frame (10).

6. The double sealing structure of a pilot-operated solenoid valve according to claim 1, characterized in that: The groove (12) is located on the central axis of the cross section of the reinforcement ring (13), and the cross section of the groove (12) is triangular.

7. The double sealing structure of a pilot-operated solenoid valve according to claim 1, characterized in that: Five sealing rings (11) are arranged on the locking frame (10), and the diameters of the sealing rings (11) gradually increase from the outer end to the inner end.

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