Valve rod and double-body electromagnetic valve

Abstract

The utility model relates to a valve rod and a double-body electromagnetic valve. The valve rod comprises a first rod body, a second rod body and a connecting block. A first thread is arranged on the peripheral surface of the end part of one side in the extension direction of the first rod body; a second thread is arranged on the peripheral surface of the end part of one side in the extending direction of the second rod body; one end of the connecting block is arranged on the outer side of the end, provided with the first thread, of the first rod body in a sleeving mode, and at least a third thread matched with the first thread is arranged in the connecting block. The other end of the connecting block is arranged on the outer side of the end, provided with the second thread, of the second rod body in a sleeving mode, and at least a fourth thread matched with the second thread is arranged in the connecting block. According to the valve rod and the double-body electromagnetic valve, the connecting block and the two sets of rod bodies are connected into a whole, and compared with an existing shaft check ring, the valve rod and the double-body electromagnetic valve are higher in operation reliability and better in connection strength; the connecting block is not prone to deformation failure after being stressed, and the service life is longer.

Description

Technical Field

[0001] This utility model relates to the field of gas equipment technology, and in particular to a valve stem and a double-body solenoid valve. Background Technology

[0002] A valve is a device used to control the flow of fluids, such as liquids, gases, or steam. The opening and closing state of a valve is used to control parameters such as the flow rate, pressure, or temperature of the fluid. In a gas system, a double-body solenoid valve is used to control the flow rate of gas. Specifically, the valve disc is opened by the valve stem body in conjunction with the shaft retaining ring. However, because the shaft retaining ring is open on one side, the structural strength of the connection with the valve stem is low, and it is very easy to deform and fall off, causing the valve to fail to open. Utility Model Content

[0003] Therefore, the technical problem to be solved by this utility model is to overcome the technical difficulty of the existing double-body solenoid valve, which uses a shaft retaining ring to cooperate with the valve stem body, and is prone to deformation and detachment leading to failure. The present invention provides a valve stem and a double-body solenoid valve to improve structural strength and stress reliability.

[0004] Firstly, to solve the aforementioned technical problems, this utility model provides a valve stem, which includes,

[0005] The first rod body has a first thread on the outer peripheral surface of one end in the extension direction of the first rod body;

[0006] The second rod body has a second thread on the outer peripheral surface of one end in the extension direction of the second rod body;

[0007] A connecting block, one end of which is sleeved on the outer side of the end of the first rod body with the first thread, and the connecting block has at least a third thread that mates with the first thread inside; the other end of which is sleeved on the outer side of the end of the second rod body with the second thread, and the connecting block has at least a fourth thread that mates with the second thread inside.

[0008] In one embodiment of the present invention, the first rod and the second rod abut against each other inside the connecting block.

[0009] In one embodiment of this utility model, the third thread and the fourth thread have the same size and are connected in the axial direction of the connecting block.

[0010] In one embodiment of this utility model, both the first rod and the second rod are configured as rods of equal diameter, and the diameters of the first rod and the second rod are equal.

[0011] In one embodiment of this utility model, the connecting block is configured as a circular ring structure, the diameter of the outer edge of the axial section of the connecting block is D1, the rod diameters of the first rod and the second rod are set to D2, D1=aD2, and 1.5<a<2.5.

[0012] In one embodiment of this utility model, a=2.

[0013] In one embodiment of the present invention, the extension length of the first thread in the axial direction is greater than or equal to that of the third thread, and the extension length of the second thread in the axial direction is greater than or equal to that of the fourth thread.

[0014] In one embodiment of this utility model, the first thread and the second thread have the same dimensions.

[0015] In one embodiment of the present invention, the outer peripheral surface of the first rod body in the area other than the first thread, and the outer peripheral surface of the second rod body in the area other than the second thread, are both provided with a smooth surface; the end of the first rod body away from the first thread is also provided with a plug-in portion.

[0016] Secondly, this utility model also provides a dual-body solenoid valve, which includes the valve stem described in any of the above embodiments.

[0017] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial effects:

[0018] The valve stem and double-body solenoid valve described in this utility model connect the connecting block to the two sets of rods to form a whole, which has higher operational reliability and better connection strength than the existing shaft retaining ring; the connecting block is not easy to deform and fail after being subjected to force, and has a longer service life. Attached Figure Description

[0019] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0020] Figure 1 This is a schematic diagram of the valve stem body in the prior art;

[0021] Figure 2 This is a schematic diagram of the structure of a retaining ring for a central shaft in existing technology;

[0022] Figure 3 This is a schematic diagram of the valve stem assembly structure in the prior art;

[0023] Figure 4 This is a schematic diagram of the valve stem structure in Embodiment 1 of this utility model;

[0024] Figure 5 This is a schematic diagram of the cross-sectional structure at the connection point of the connecting block, the first rod, and the second rod in Embodiment 1 of this utility model.

[0025] Explanation of reference numerals in the accompanying drawings: 1. First rod body; 11. First thread; 2. Second rod body; 21. Second thread; 3. Connecting block; 31. Third thread; 32. Fourth thread; 4. Valve stem body; 41. Groove; 5. Shaft retaining ring; 51. Opening; 6. Insertion part. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention. Example 1

[0027] This utility model provides a valve stem comprising a first rod body 1, a second rod body 2, and a connecting block 3, which are separately configured. The connecting block 3 is sleeved on the outside of the first rod body 1 and the second rod body 2 to fasten the valve stem, improve the connection strength, and drive the valve disc. The valve stem described in this utility model has higher reliability and a longer service life compared to existing valve stems.

[0028] Reference Figures 1-3 The diagram shows a conventional valve stem structure, which is achieved by the cooperation of a valve stem body 4 and a shaft retaining ring 5. A groove 41 is machined into the middle of the extending direction of the valve stem body 4. The groove 41 is recessed radially inward from the outer circumferential surface of the valve stem body 4 and is configured as an annular groove. The groove 41 is used to install the shaft retaining ring 5. (Refer to...) Figure 2 As shown, the shaft retaining ring 5 is configured as an annular structure with an opening 51. The shaft retaining ring 5 is installed into the groove 41 through the opening 51 to control the movement of the valve stem axis.

[0029] Subsequently, the inventors of this case discovered that the existing valve stem structure uses the valve stem body 4 to drive the shaft retaining ring 5 to push the valve disc to open the valve. Because the shaft retaining ring 5 has a small thickness in the axial direction, it is easily deformed under force during pushing. The opening 51 also results in low structural strength of the shaft retaining ring 5, making it prone to fatigue and detachment after deformation. For a dual-body solenoid valve, valve stem control failure will cause the valve opening to be uncontrollable, requiring troubleshooting, which is time-consuming, labor-intensive, and increases production costs. Furthermore, since the valve stem body 4 is a 6mm diameter cylindrical rod, and its surface is machined using a centerless grinder, resulting in a high surface finish, it is impossible to machine a shoulder in the extension direction to replace the shaft retaining ring 5. Therefore, this utility model embodiment provides a valve stem that replaces the shaft retaining ring 5 with the connecting block 3, enhancing the connection reliability between the connecting block 3 and the rod body, and making the valve stem more durable and reliable.

[0030] Specifically, refer to Figure 4 and Figure 5 As shown in Embodiment 1 of this utility model, the main body of the valve stem is configured as a split structure connected to the connecting block 3. The main body of the valve stem includes a first rod body 1 and a second rod body 2. One end of the first rod body 1 in the extending direction is used to connect to the connecting block 3, and its outer circumferential surface is provided with a first thread 11, which is an external thread. The area of ​​the connecting block 3 used to connect with the first rod body 1 is provided with a third thread 31, which is an internal thread. One end of the second rod body 2 in the extending direction is used to connect to the connecting block 3, and its outer circumferential surface is provided with a second thread 21, which is an external thread. The area of ​​the connecting block 3 used to connect with the second rod body 2 is provided with a fourth thread 32, which is an internal thread.

[0031] Furthermore, in some embodiments, the third thread 31 and the fourth thread 32 are both located on the inner circumferential surface of the connecting block 3 and are spaced apart in the axial direction of the connecting block 3. In some embodiments, the third thread 31 and the fourth thread 32 are connected in the axial direction, so that after assembly, the end of the first rod 1 with the first thread 11 and the end of the second rod 2 with the second thread 21 can abut against each other inside the connecting block 3. The connecting block 3 is configured as a ring structure and covers the connection. Compared with the plug-in structure, the threaded connection can increase the connection strength between the first rod 1 and the connecting block 3, and between the second rod 2 and the connecting block 3, making it less prone to bending when pushing the valve stem.

[0032] Furthermore, in a preferred embodiment of this utility model, the third thread 31 and the fourth thread 32 are interconnected and have the same thread profile, thread width and pitch, which facilitates the processing of the connecting block 3; correspondingly, the first thread 11 and the second thread 21 have the same thread profile, thread width and pitch.

[0033] Furthermore, the third thread 31 and the fourth thread 32 have equal extension lengths in the axial direction; when the first rod 1 and the second rod 2 abut against each other, the length of the area of ​​the first rod 1 extending into the connecting block 3 is equal to the length of the area of ​​the second rod 2 extending into the connecting block 3, and the connecting block 3 simultaneously tightens the two rods to avoid uneven force at the connection. The extension length L1 of the connecting block in the axial direction, and the extension lengths L2 of the first thread 11 and the second thread 21 in the axial direction are both L2, where L1 = 2L2.

[0034] Furthermore, the extension length of the first thread 11 in the axial direction is greater than or equal to that of the third thread 31, and the extension length of the second thread 21 in the axial direction is greater than or equal to that of the fourth thread 32, so that the ends of the first rod 1 and the second rod 2 can be fully connected with the connecting block 3, avoiding the absence of threads in some connection areas and improving connection reliability. Preferably, the dimensions of the first thread 11, the second thread 21, the third thread 31, and the fourth thread 32 are exactly the same.

[0035] Specifically, refer to Figure 4 and Figure 5 As shown, both the first rod 1 and the second rod 2 are cylindrical rods of equal diameter. The outer circumferential surface of the first rod 1, excluding the first thread 11, and the outer circumferential surface of the second rod 2, excluding the second thread 21, are both smooth surfaces. No shoulders can be machined on either rod, and a reliable connection is achieved solely through the connecting block 3. Preferably, the diameters of the first rod 1 and the second rod 2 are equal.

[0036] Furthermore, the diameter of the outer edge of the axial section of the connecting block 3 is D1, and the diameters of the first rod 1 and the second rod 2 are set to D2. Therefore, D1 = aD2, and 1.5 < a < 2.5. If the value of a is too small, the outward convexity in the radial direction is small, making it unable to replace the shaft retaining ring 5 for valve control. If the value of a is too large, to ensure the structural strength of the connection and the stability in the axial direction, the connecting block 3 also needs to have a corresponding length in the axial direction, resulting in excessive mass of the connecting block 3, making it inconvenient to use and operate. Preferably, D1 = 2 * D2.

[0037] Specifically, refer to Figure 4 As shown, the end of the first rod body 1 away from the first thread 11 is also provided with a plug-in part 6. The cross-sectional radius of the plug-in part 6 gradually decreases, and the outer periphery of the plug-in part 6 is set as a tapered surface to facilitate insertion into the valve body. Example 2

[0038] This utility model provides a dual-body solenoid valve in embodiment two. The dual-body solenoid valve includes the valve stem described in embodiment one and also includes a valve disc. The first rod body 1 and the second rod body 2 are screwed into the connecting block 3 to complete the assembly. One end of the valve stem enters the valve body and pushes the valve disc to realize the valve body opening control, thereby controlling the gas flow.

[0039] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A valve stem, characterized in that, include, The first rod body has a first thread on the outer peripheral surface of one end in the extension direction of the first rod body; The second rod body has a second thread on the outer peripheral surface of one end in the extension direction of the second rod body; A connecting block, one end of which is sleeved on the outer side of the end of the first rod body with the first thread, and the connecting block has at least a third thread that mates with the first thread inside; the other end of which is sleeved on the outer side of the end of the second rod body with the second thread, and the connecting block has at least a fourth thread that mates with the second thread inside; the third thread and the fourth thread have the same size and are connected in the axial direction of the connecting block. The first rod and the second rod abut against each other inside the connecting block. The outer peripheral surface of the first rod in the area outside the first thread, and the outer peripheral surface of the second rod in the area outside the second thread, are both provided with a smooth surface. The end of the first rod away from the first thread is also provided with a plug-in portion.

2. The valve stem according to claim 1, characterized in that: Both the first rod and the second rod are configured as rods of equal diameter, and the diameters of the first rod and the second rod are equal.

3. The valve stem according to claim 2, characterized in that: The connecting block is configured as a circular ring structure, the diameter of the outer edge of the axial section of the connecting block is D1, the rod diameters of the first rod and the second rod are set to D2, D1=aD2, and 1.5<a<2.

5.

4. The valve stem according to claim 3, characterized in that: a=2。 5. The valve stem according to claim 1, characterized in that: The first thread has an axial extension length greater than or equal to that of the third thread, and the second thread has an axial extension length greater than or equal to that of the fourth thread.

6. The valve stem according to claim 1 or 5, characterized in that: The first thread has the same dimensions as the second thread.

7. A double-body solenoid valve, characterized in that, Includes the valve stem as described in any one of claims 1 to 6.

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