Expansion valve

Abstract

The utility model belongs to the technical field of valves, and particularly relates to an expansion valve which comprises a valve body and a valve ball, the valve body is provided with a first connecting section, a second connecting section and an exhaust section, the valve ball is provided with a first liquid passing hole, a second liquid passing hole and an exhaust hole, and the exhaust section is provided with a plugging device used for plugging and opening the exhaust section. The first liquid passing hole communicates with an inner cavity of the first connecting section, the second liquid passing hole communicates with an inner cavity of the second connecting section, the exhaust hole communicates with an inner cavity of the exhaust section, and the exhaust section is blocked by the blocking device. When exhausting is needed, the plugging device opens the exhausting section; when the expansion tank needs to be maintained or replaced, the first liquid passing hole is not communicated with the inner cavity of the first connecting section and / or the second liquid passing hole is not communicated with the inner cavity of the second connecting section. When the expansion tank needs to be maintained and replaced, liquid conveying to the pipeline does not need to be stopped, the valve rod is rotated to adjust the valve ball, liquid in the pipeline is effectively prevented from flowing out, and waste is avoided; and an exhaust section and a plugging device are arranged, so that gas is conveniently exhausted, and meanwhile, liquid leakage is effectively prevented.

Description

Technical field:

[0001] The utility model belongs to the technical field of valves, in particular to an expansion valve. Background technology:

[0002] The expansion tank is a device used to balance the pressure in the pipeline. Its working principle is: when pressurized water from the outside enters the expansion tank airbag, the nitrogen sealed in the tank is compressed. According to Boyle's gas law, the volume of the gas decreases and the pressure increases after being compressed. The water inflow stops when the gas pressure in the expansion tank reaches the same as the water pressure. When the water loss pressure decreases, the gas pressure in the expansion tank is greater than the water pressure. At this time, the gas expands and squeezes the water in the airbag to replenish the system.

[0003] Existing expansion tanks are usually installed directly on the pipeline, such as Figure 1 As shown, the interface of the expansion tank 1 is directly connected to the interface of the pipeline 2.

[0004] The disadvantages of the connection structure between the expansion valve and the pipeline are: 1. When the expansion tank needs to be repaired or replaced, it is necessary to stop conveying liquid to the pipeline first, otherwise the liquid in the pipeline will flow out through the interface of the pipeline, causing waste; 2. When there is gas mixed in the pipeline, it is not convenient to discharge the gas. Summary of the invention:

[0005] The utility model aims to provide an expansion valve, which does not need to stop conveying liquid to the pipeline when the expansion tank needs to be repaired or replaced. The valve stem can be turned to adjust the valve ball, thereby effectively preventing the liquid in the pipeline from flowing out and avoiding waste. The exhaust section and the plugging device are arranged to facilitate the exhaust of gas and effectively prevent leakage.

[0006] The utility model is achieved in this way:

[0007] 1. The venting device of claim 1, wherein the venting device is configured to extend the length of the venting portion of the valve body and the length of the venting portion of the valve body. The venting device is configured to extend the length of the venting portion of the valve body and the length of the venting portion of the valve body. The venting device is configured to extend the length of the venting portion of the valve body and the length of the venting portion of the valve body. The venting device is configured to extend the length of the venting portion of the valve body and the length of the venting portion of the valve body.

[0008] In the above expansion valve, the center line of the connecting section 1 and the center line of the connecting section 2 are on the same straight line, and the center line of the valve stem is perpendicular to the center line of the connecting section 1.

[0009] In the above expansion valve, the center line of the exhaust section and the center line of the valve stem are on the same straight line.

[0010] In the above-mentioned expansion valve, the blocking device includes an exhaust valve seat connected to the exhaust section, the inner end of the exhaust valve seat is provided with an exhaust passage connected to the inner cavity of the exhaust section, and the side wall is provided with an exhaust hole, and an exhaust valve core is provided in the exhaust valve seat, the inner end of the exhaust valve core blocks and opens the exhaust passage, and the outer end extends out of the exhaust valve seat, when the blocking device opens the exhaust section, the inner end of the exhaust valve core opens the exhaust passage, and the exhaust passage is connected to the exhaust hole; when the blocking device blocks the exhaust section, the inner end of the exhaust valve core blocks the exhaust passage, and the exhaust passage is not connected to the exhaust hole.

[0011] In the above expansion valve, the exhaust valve core is screwed into the exhaust section.

[0012] In the above expansion valve, the inner end of the exhaust valve core is sleeved with a sealing ring for blocking and opening the air outlet channel.

[0013] In the above expansion valve, the exhaust valve seat is covered with an air outlet sleeve, the inner cavity of the air outlet sleeve is connected to the air outlet hole, and the air outlet sleeve is provided with an air outlet pipe connected to the inner cavity of the air outlet sleeve.

[0014] In the above expansion valve, the valve body is provided with a neck, one end of the valve stem away from the valve ball extends out of the neck and is connected to a handle, the neck is provided with a mounting seat, and the handle is connected to the mounting seat through a lead seal assembly.

[0015] In the above expansion valve, the handle is provided with a mounting sleeve which is sleeved outside the mounting seat, and the lead seal assembly includes a sealing wire and a lead seal. The sealing wire passes through the mounting sleeve, the mounting seat and the mounting sleeve in sequence, and the two ends are connected by a lead seal.

[0016] The outstanding advantages of the utility model compared with the prior art are:

[0017] 1. When the expansion tank of the utility model needs to be repaired or replaced, there is no need to stop the pipeline from conveying liquid. Just turn the valve stem to adjust the valve ball, which effectively prevents the liquid in the pipeline from flowing out and avoids waste. The exhaust section and the plugging device are arranged to facilitate the exhaust of gas and effectively prevent leakage.

[0018] 2. The handle of the utility model is connected to the mounting base through a lead seal assembly, which effectively prevents others from turning the handle by mistake and ensures that the product functions online. Description of the drawings:

[0019] Figure 1It is a stereogram of the prior art;

[0020] Figure 2 It is a three-dimensional diagram of the utility model;

[0021] Figure 3 It is a stereoscopic diagram of the expansion valve and lead seal assembly of the utility model;

[0022] Figure 4 It is a cross-sectional view of the expansion valve of the utility model;

[0023] Figure 5 It is an exploded view of the expansion valve of the utility model.

[0024] Reference numerals:

[0025] Figure 1 In: 1. Expansion tank; 2. Pipeline.

[0026] Figure 2-5 In: 11. Valve body; 12. Valve ball; 13. Valve stem; 14. Pipeline; 15. Connection section 1; 16. Expansion tank; 17. Connection section 2; 18. Exhaust section; 19. Liquid hole 1; 20. Liquid hole 2; 21. Exhaust hole; 22. Exhaust valve seat; 23. Exhaust channel; 24. Exhaust hole; 25. Exhaust valve core; 26. Sealing ring; 27. Exhaust sleeve; 28. Exhaust pipe; 29. ​​Neck; 30. Handle; 31. Mounting seat; 32. Mounting sleeve; 33. Sealing line; 34. Lead seal. Specific implementation method:

[0027] The present invention is further described below with reference to specific embodiments. Figure 2 —5:

[0028] An expansion valve, comprising a valve body 11 and a valve ball 12 arranged in the valve body 11, the valve ball 12 is connected to one end of a valve stem 13, the other end of the valve stem 13 extends out of the valve body 11, the valve body 11 is provided with a connecting section 15 for connecting to an interface of a pipeline 14, a connecting section 2 17 for connecting to an interface of an expansion tank 16, and an exhaust section 18 for exhausting gas, the connecting section 15, the connecting section 2 17 and the exhaust section 18 are hollow structures, the valve ball 12 is provided with a liquid hole 19, a liquid hole 20 and an exhaust hole 21, the liquid hole 19, the liquid hole 20 and the exhaust hole 21 are connected to each other, the exhaust section 18 is provided with a The sealing device is used for sealing and opening the exhaust section 18. In normal use, the liquid hole 19 is connected to the inner cavity of the connecting section 15, the liquid hole 20 is connected to the inner cavity of the connecting section 17, the exhaust hole 21 is connected to the inner cavity of the exhaust section 18, and the sealing device seals the exhaust section 18; when exhaust is required, the liquid hole 19 is connected to the inner cavity of the connecting section 15, the liquid hole 20 is connected to the inner cavity of the connecting section 17, the exhaust hole 21 is connected to the inner cavity of the exhaust section 18, and the sealing device opens the exhaust section 18; when the expansion tank 16 needs to be repaired or replaced, the liquid hole 19 is not connected to the inner cavity of the connecting section 15 and / or the liquid hole 20 is not connected to the inner cavity of the connecting section 17.

[0029] The working principle of the utility model is as follows: Figure 2-5 As shown, in normal use, the liquid hole 19 is connected to the inner cavity of the connecting section 15, the liquid hole 20 is connected to the inner cavity of the connecting section 2 17, the exhaust hole 21 is connected to the inner cavity of the exhaust section 18, and the blocking device blocks the exhaust section 18. The liquid in the pipeline 14 flows to the expansion tank 16 through the connecting section 15, the liquid hole 19, the liquid hole 20 and the connecting section 2 17. The liquid in the expansion tank 16 can also flow to the pipeline 14 through the connecting section 2 17, the liquid hole 20, the liquid hole 19 and the connecting section 15, so that the expansion tank 16 can balance the pressure in the pipeline 14.

[0030] When exhaust is required, the liquid hole 19 is connected to the inner cavity of the connecting section 15, the liquid hole 20 is connected to the inner cavity of the connecting section 17, the exhaust hole 21 is connected to the inner cavity of the exhaust section 18, and the plugging device opens the exhaust section 18. The gas in the pipeline 14 is discharged through the connecting section 15, the liquid hole 19, the exhaust hole 21, and the exhaust section 18, thereby achieving the exhaust effect;

[0031] When the expansion tank 16 needs to be repaired or replaced, there may be three situations. The first situation: the liquid hole 19 is not connected to the inner cavity of the connecting section 15, and the liquid hole 20 is not connected to the inner cavity of the connecting section 2 17. The liquid in the pipeline 14 will not flow into the valve body 11 through the liquid hole 19. After the expansion tank 16 is removed, the liquid in the pipeline 14 will not flow out through the expansion valve of the utility model, which effectively prevents waste; the second situation: the liquid hole 19 is not connected to the inner cavity of the connecting section 15, the liquid in the pipeline 14 will not flow into the valve body 11 through the liquid hole 19. After the expansion tank 16 is removed, the liquid in the pipeline 14 will not flow out through the expansion valve of the utility model, which effectively prevents waste; the third situation: the liquid hole 20 is not connected to the inner cavity of the connecting section 2 17. After the expansion tank 16 is removed, the liquid in the pipeline 14 will not flow out of the expansion valve of the utility model through the liquid hole 20, which effectively prevents waste.

[0032] In the first case, the specific structure of the expansion valve of the utility model is as follows: Figure 2-5 As shown, the center line of the connecting section 15 and the center line of the connecting section 2 17 are on the same straight line, the center line of the valve stem 13 is perpendicular to the center line of the connecting section 15, and the connecting section 15 and the connecting section 2 17 are straight-through structures, which are convenient for liquid inlet and outlet and convenient for processing the valve body 11. The center line of the exhaust section 18 can be perpendicular to the center line of the valve stem 13, and the center line of the exhaust section 18 can also be on the same straight line with the center line of the valve stem 13, which effectively utilizes space and has a reasonable layout.

[0033] In the second case, the specific structure of the expansion valve of the utility model is as follows: the center line of the connecting section 15 is in the same straight line as the center line of the exhaust section 18, the center line of the valve stem 13 is vertically arranged with the center line of the connecting section 15, and the center line of the connecting section 2 17 is in the same straight line as the center line of the valve stem 13.

[0034] In the third case, the specific structure of the expansion valve of the utility model is as follows: the center line of the connecting section 15 is in the same straight line as the center line of the valve stem 13, the center line of the connecting section 2 17 is in the same straight line as the center line of the exhaust section 18, and the center line of the valve stem 13 is vertically arranged with the center line of the connecting section 2 17.

[0035] In this embodiment, the structure of the expansion valve is the first case.

[0036] When the expansion tank 16 of the utility model needs to be repaired or replaced, there is no need to stop conveying liquid to the pipeline 14. The valve stem 13 can be rotated to adjust the valve ball 12, which effectively prevents the liquid in the pipeline 14 from flowing out and avoids waste. The exhaust section 18 and the blocking device are arranged to facilitate the exhaust of gas and effectively prevent leakage.

[0037] The structure of the plugging device: the plugging device comprises an exhaust valve seat 22 connected to the exhaust section 18, the inner end of the exhaust valve seat 22 is provided with an outlet passage 23 connected to the inner cavity of the exhaust section 18, and the side wall is provided with an outlet hole 24. The exhaust valve seat 22 is provided with an exhaust valve core 25, the inner end of the exhaust valve core 25 blocks and opens the outlet passage 23, and the outer end extends out of the exhaust valve seat 22. When the plugging device opens the exhaust section 18, the inner end of the exhaust valve core 25 opens the outlet passage 23, and the outlet passage 23 is connected to the outlet hole 24; when the plugging device blocks the exhaust section 18, the inner end of the exhaust valve core 25 blocks the outlet passage 23, and the outlet passage 23 is not connected to the outlet hole 24. The structure is simple and easy to install.

[0038] Furthermore, the exhaust valve core 25 is screwed into the exhaust section 18 .

[0039] In order to better seal the exhaust valve core 25 to the exhaust passage 23, as shown in FIG. Figure 4 , 5 As shown, a sealing ring 26 for blocking and opening the air outlet channel 23 is sleeved on the inner end of the exhaust valve core 25 .

[0040] In order to adjust the exhaust direction at multiple angles, the exhaust valve seat 22 is sheathed with an exhaust sleeve 27 , the inner cavity of the exhaust sleeve 27 is connected to the exhaust hole 24 , and an exhaust pipe 28 connected to the inner cavity of the exhaust sleeve 27 is provided on the exhaust sleeve 27 .

[0041] In order to prevent others from accidentally turning the handle 30 and effectively ensure that the product function is online, a neck 29 is provided on the valve body 11, and the end of the valve stem 13 away from the valve ball 12 extends out of the neck 29 to connect with the handle 30. The neck 29 is provided with a mounting seat 31, and the handle 30 is connected to the mounting seat 31 through a lead seal assembly.

[0042] Structure of the lead seal assembly: The handle 30 is provided with a mounting sleeve 32 which is sleeved on the mounting seat 31. The lead seal assembly includes a sealing wire 33 and a lead seal 34. The sealing wire 33 passes through the mounting sleeve 32, the mounting seat 31 and the mounting sleeve 32 in sequence, and the two ends are connected by the lead seal 34.

[0043] The above embodiment is only one of the preferred embodiments of the present utility model, and is not intended to limit the scope of implementation of the present utility model. Therefore, any equivalent changes made based on the shape, structure, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. An expansion valve, characterized in that: The invention comprises a valve body (11) and a valve ball (12) arranged in the valve body (11), wherein the valve ball (12) is connected to one end of a valve stem (13), and the other end of the valve stem (13) extends out of the valve body (11), and the valve body (11) is provided with a connecting section 1 (15) for connecting to an interface of a pipeline (14), a connecting section 2 (17) for connecting to an interface of an expansion tank (16), and an exhaust section (18) for exhausting gas, wherein the connecting section 1 (15), the connecting section 2 (17) and the exhaust section (18) are hollow structures, and the valve ball (12) is provided with a liquid passage hole 1 (19), a liquid passage hole 2 (20) and an exhaust hole (21), wherein the liquid passage hole 1 (19), the liquid passage hole 2 (20) and the exhaust hole (21) are connected to each other, and the exhaust section (18) is provided with a A blocking device is provided for blocking and opening the exhaust section (18). In normal use, the first liquid hole (19) is connected to the inner cavity of the first connecting section (15), the second liquid hole (20) is connected to the inner cavity of the second connecting section (17), the exhaust hole (21) is connected to the inner cavity of the exhaust section (18), and the blocking device blocks the exhaust section (18); when exhaust is required, the first liquid hole (19) is connected to the inner cavity of the first connecting section (15), the second liquid hole (20) is connected to the inner cavity of the second connecting section (17), the exhaust hole (21) is connected to the inner cavity of the exhaust section (18), and the blocking device opens the exhaust section (18); when the expansion tank (16) needs to be repaired or replaced, the first liquid hole (19) is not connected to the inner cavity of the first connecting section (15) and / or the second liquid hole (20) is not connected to the inner cavity of the second connecting section (17).

2. An expansion valve according to claim 1, characterized in that: The center line of the connecting section 1 (15) and the center line of the connecting section 2 (17) are on the same straight line, and the center line of the valve stem (13) is arranged perpendicular to the center line of the connecting section 1 (15).

3. An expansion valve according to claim 2, characterized in that: The center line of the exhaust section (18) and the center line of the valve stem (13) are on the same straight line.

4. An expansion valve according to claim 1, characterized in that: The blocking device comprises an exhaust valve seat (22) connected to the exhaust section (18); an exhaust passage (23) communicating with the inner cavity of the exhaust section (18) is provided at the inner end of the exhaust valve seat (22); an exhaust hole (24) is provided on the side wall; an exhaust valve core (25) is provided in the exhaust valve seat (22); the inner end of the exhaust valve core (25) blocks and opens the exhaust passage (23), and the outer end extends out of the exhaust valve seat (22); when the blocking device opens the exhaust section (18), the inner end of the exhaust valve core (25) opens the exhaust passage (23), and the exhaust passage (23) communicates with the exhaust hole (24); when the blocking device blocks the exhaust section (18), the inner end of the exhaust valve core (25) blocks the exhaust passage (23), and the exhaust passage (23) is not communicated with the exhaust hole (24).

5. An expansion valve according to claim 4, characterized in that: The inner end of the exhaust valve core (25) is sleeved with a sealing ring (26) for blocking and opening the exhaust passage (23).

6. An expansion valve according to claim 4, characterized in that: The exhaust valve seat (22) is sheathed with an air outlet sleeve (27), the inner cavity of the air outlet sleeve (27) is connected to the air outlet hole (24), and the air outlet sleeve (27) is provided with an air outlet pipe (28) connected to the inner cavity of the air outlet sleeve (27).

7. An expansion valve according to claim 1, characterized in that: The valve body (11) is provided with a neck (29), one end of the valve stem (13) away from the valve ball (12) extends out of the neck (29) and is connected to a handle (30), the neck (29) is provided with a mounting seat (31), and the handle (30) is connected to the mounting seat (31) through a lead sealing assembly.

8. An expansion valve according to claim 7, characterized in that: The handle (30) is provided with a mounting sleeve (32) sleeved outside the mounting seat (31); the lead seal assembly comprises a sealing wire (33) and a lead seal (34); the sealing wire (33) passes through the mounting sleeve (32), the mounting seat (31), and the mounting sleeve (32) in sequence, and then the two ends are connected by the lead seal (34).

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