Safety charging valve

Abstract

The utility model belongs to the technical field of high-pressure refrigerating system accessories, and relates to a safety filling valve which comprises a valve body, a refrigerant outlet is formed in one side of the valve body, an inflating valve is arranged at the bottom of the valve body, and a refrigerant inlet is formed in the bottom of the inflating valve. A refrigerant inlet and a refrigerant outlet are formed in the valve body, a valve cavity communicated with the refrigerant inlet and the refrigerant outlet is formed in the valve body and an inner cavity of the inflating valve, a valve core for controlling the refrigerant inlet is arranged in the inflating valve, a valve rod moving in the axial direction is arranged in the valve body, and an ejector pin which is coaxial with the valve core and connected with the valve core in an abutting mode is arranged at the bottom of the valve rod. The safety charging valve provided by the utility model can meet the safety requirement of refrigerant charging and recycling of a high-pressure or extra-high-pressure refrigerating system.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-pressure refrigeration system accessories and relates to a safety filling valve. Background Art

[0002] High-pressure or ultra-high-pressure refrigeration systems usually use high-pressure carbon dioxide R744 as the refrigerant. During use, there are requirements for filling and recovering the high-pressure refrigerant. The existing filling structure generally installs a valve core on the refrigerant tank or recovery container, and then fills or recovers the refrigerant through the valve core. This structure has no problems when the pressure of the refrigeration system is below 4.2 Mpa. However, when the pressure is higher, especially above 7 Mpa, the valve core will pop out like a bullet under the action of the pressure, causing very serious safety accidents. In view of this, it is necessary to develop a safer refrigerant filling and recovery device. Summary of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the utility model provides a safety filling valve, which can meet the safety requirements for filling and recovering the refrigerant in high-pressure or extra-high-pressure refrigeration systems.

[0004] To solve the above technical problems, the purpose of the utility model is achieved through the following technical solutions:

[0005] A safety filling valve includes a valve body. A refrigerant outlet is arranged on one side of the valve body. A valve nozzle is arranged at the bottom of the valve body. The bottom of the valve nozzle forms a refrigerant inlet. The internal cavities of the valve body and the valve nozzle form a valve cavity communicating the refrigerant inlet and the refrigerant outlet. A valve core for controlling the refrigerant inlet is arranged in the valve nozzle. A valve rod that moves axially is arranged in the valve body. A thimble coaxially arranged with the valve core and in contact connection is arranged at the bottom of the valve rod.

[0006] In the above safety filling valve, the thimble can be connected to the bottom of the valve rod by screwing or other fixing methods, or can be directly formed on the valve rod; preferably, the thimble and the valve rod are integrally formed.

[0007] In the above safety filling valve, a sleeve joint sleeved outside the thimble and in clearance fit with the thimble is connected to the bottom of the valve body. A locking nut for axial limit is sleeved outside the sleeve joint. The locking nut is screwed and fixed to the valve nozzle; further, its axial limit structure includes a reduced-diameter inner edge ring arranged at the upper end of the locking nut and an enlarged-diameter outer edge ring arranged at the lower end of the sleeve joint.

[0008] In the above safety filling valve, when the valve nozzle is locked, the upper end face of the valve nozzle abuts against the lower end face of the sleeve joint and is hermetically connected through a matching conical sealing surface.

[0009] In the above-mentioned safety filling valve, a threaded connection part which matches with each other is arranged on the valve stem and the valve body. When the valve stem rotates, an axial displacement is generated. A sealing structure is arranged between the valve body above the threaded connection part and the valve stem.

[0010] In the above-mentioned safety filling valve, the sealing structure includes a sealing shaft sleeve arranged at the upper end of the valve body, and the valve stem is rotatably arranged in the sealing shaft sleeve.

[0011] In the above-mentioned safety filling valve, the sealing structure includes a high-pressure sealing ring sleeved on the valve stem; the high-pressure sealing ring is preferably a high-pressure sealing ring with a three-layer structure, including a middle support layer and two end sealing layers.

[0012] In the above-mentioned safety filling valve, the sealing shaft sleeve and the high-pressure sealing ring can also be used simultaneously: a limiting step which matches with the high-pressure sealing ring is arranged in the valve body, the upper and lower end faces of the high-pressure sealing ring are respectively in contact connection with the sealing shaft sleeve and the limiting step, and the inner and outer peripheral faces are respectively in contact connection with the valve stem and the valve body.

[0013] In the above-mentioned safety filling valve, a protective cover is detachably sleeved on the upper end of the valve body. The exposed parts of the valve stem and the sealing shaft sleeve are located in the inner cavity of the protective cover. The protective cover is hermetically connected with the valve body through the deformation of a copper washer arranged in the protective cover; preferably, the protective cover is made of carbon steel.

[0014] In the above-mentioned safety filling valve, a threaded joint is connected to the refrigerant outlet of the valve body.

[0015] The above-mentioned safety filling valve is installed in a high-pressure refrigeration system, and the refrigerant of the high-pressure refrigeration system is R744, and the pressure is 7-13 Mpa.

[0016] Compared with the prior art, the present utility model has the following beneficial effects:

[0017] The present utility model provides a safety filling valve, which integrates a valve nozzle and a valve core for filling into a mechanical valve body which can withstand high pressure. When filling or recovering the refrigerant, the opening and closing operations of the valve core at the port are both transferred to the inside of a sealed valve which can withstand high pressure, thereby avoiding safety accidents caused by the valve core being easily ejected when it is opened under high pressure. The safety filling valve of the present utility model can withstand a maximum pressure of 13 Mpa, fully meeting the requirements of high-pressure or ultra-high-pressure refrigeration systems. In addition, when filling and recovering the refrigerant through the safety filling valve of the present utility model, it also has the advantages of convenience and rapidity. Description of the Drawings

[0018] Figure 1 is a perspective view of the present utility model;

[0019] Figure 2is the axial sectional view of the present utility model;

[0020] Reference numerals: 1, valve body; 2, refrigerant outlet; 3, valve nozzle; 4, refrigerant inlet; 5, valve core; 6, valve stem; 7, thimble; 8, sleeve joint; 9, lock nut; 10, conical sealing surface; 11, threaded connection part; 12, sealing shaft sleeve; 13, high-pressure sealing ring; 14, limit step; 15, protective sleeve; 16, copper washer; 17, threaded joint. Specific embodiments

[0021] The present utility model will be further described below with reference to the accompanying drawings in specific embodiments. See Figure 1-2 :

[0022] A safety filling valve includes a valve body 1. A refrigerant outlet 2 is provided on one side of the valve body 1. A valve nozzle 3 is provided at the bottom of the valve body 1. A refrigerant inlet 4 is formed at the bottom of the valve nozzle 3. The inner cavities of the valve body 1 and the valve nozzle 3 form a valve cavity communicating the refrigerant inlet 4 and the refrigerant outlet 2. A valve core 5 for controlling the refrigerant inlet 4 is provided in the valve nozzle 3. A valve stem 6 that moves axially is provided in the valve body 1. A thimble 7 that is coaxial with the valve core 5 and is in abutting connection is provided at the bottom of the valve stem 6.

[0023] When it is necessary to fill or recover the refrigerant, connect the refrigerant inlet 4 to the refrigerant delivery port, connect the refrigerant outlet 2 to the charging tank or recovery container, and then move the valve stem 6 downward. The thimble 7 moves downward accordingly and presses the valve core 5 downward. The safety filling valve of this embodiment is opened, guiding the ultra-high pressure refrigerant to enter the valve cavity from the refrigerant inlet 4, and then flowing from the inside of the valve to the refrigerant outlet 2. The entire refrigerant delivery process is completed within the safety filling valve, thus achieving the effects of safety and speed.

[0024] In this embodiment, the thimble 7 and the valve stem 6 are integrally formed.

[0025] In this embodiment, the connection structure between the valve nozzle 3 and the valve body 1 is as follows: A sleeve joint 8 that is sleeved outside the thimble 7 and has a clearance fit with it is connected to the bottom of the valve body 1. The clearance between the sleeve joint 8 and the thimble 7 forms a refrigerant passage. A lock nut 9 with axial limit is sleeved outside the sleeve joint 8. The lock nut 9 is screwed and fixed to the valve nozzle 3. After fixation, the lock nut 9 locks the ends of both the valve nozzle 3 and the sleeve joint 8 at the same time; Further, its axial limit structure includes a reduced-diameter inner edge ring provided at the upper end of the lock nut 9 and an enlarged-diameter outer edge ring provided at the lower end of the sleeve joint.

[0026] In order to enhance the sealing performance, when the valve nozzle 3 is locked, the upper end surface of the valve nozzle 3 abuts against the lower end surface of the sleeve joint 8, and they are sealed and connected through the matching conical sealing surface 10.

[0027] In this embodiment, the valve stem 6 generates an axial displacement by rotation: A threaded connection portion 11 which matches with each other is provided on the valve stem 6 and the valve body 1. When the valve stem 6 rotates, an axial displacement is generated. A sealing structure is provided between the valve body 1 above the threaded connection portion 11 and the valve stem 6; A polyhedron structure which cooperates with a rotating tooling is provided at the upper end of the valve stem 6.

[0028] The above sealing structure includes a sealing shaft sleeve 12 provided at the upper end of the valve body 1 and a high-pressure sealing ring 13 sleeved on the valve stem 6. The valve stem 6 is rotatably arranged in the sealing shaft sleeve 12. A limiting step 14 which cooperates with the high-pressure sealing ring 13 is provided in the valve body 1. The upper and lower end faces of the high-pressure sealing ring 13 are respectively in contact connection with the sealing shaft sleeve 12 and the limiting step 14, and the inner and outer peripheral faces are respectively in contact connection with the valve stem 6 and the valve body 1; By using the sealing shaft sleeve 12, the function of sealing can be achieved while facilitating the rotation of the valve stem 6. By using the high-pressure sealing ring 13, the valve cavity can better meet the requirements of high-pressure sealing.

[0029] In order to protect precision components such as the valve stem 6 and the sealing shaft sleeve 12, and prevent water and dust, a protective cover 15 is detachably covered at the upper end of the valve body 1. The exposed parts of the valve stem 6 and the sealing shaft sleeve 12 are located in the inner cavity of the protective cover 15. The protective cover 15 is hermetically connected with the valve body 1 through the deformation of a copper washer 16 arranged in the protective cover 15. The protective cover 15 and the valve body 1 are hermetically connected to form a secondary sealing structure, which can prevent the high-pressure gas in the extra-high voltage device from leaking from the valve stem 6 and the high-pressure sealing ring 13 and causing harm to the human body; Preferably, the protective cover 15 is made of carbon steel; When it is necessary to rotate the valve stem 6, the protective cover 15 is removed from the valve body 1. After use, the protective cover 15 is covered again.

[0030] In order to facilitate the connection of an air charging tank or a recovery container, a threaded joint 17 is connected to the refrigerant outlet 2 of the valve body 1.

[0031] The safety charging valve of this embodiment is installed in a high-pressure refrigeration system, and its maximum pressure bearing can reach 13 Mpa. Therefore, it can be applied to the following specific high-pressure refrigeration systems: The refrigerant of the high-pressure refrigeration system is R744, and the pressure is 7 - 13 Mpa.

[0032] The above embodiments are only preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore: All equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A safety charging valve, comprising a valve body (1), one side of the valve body being provided with a refrigerant outlet (2), characterized in that: A valve (3) is arranged at the bottom of the valve body (1), a refrigerant inlet (4) is formed at the bottom of the valve (3), the valve body (1) and the internal cavity of the valve (3) form a valve cavity connecting the refrigerant inlet (4) and the refrigerant outlet (2), a valve core (5) for controlling the refrigerant inlet (4) is arranged in the valve (3), an axially movable valve stem (6) is arranged in the valve body (1), and a pin (7) coaxial with and abuttingly connected to the valve core (5) is arranged at the bottom of the valve stem (6); The valve stem (6) and the valve body (1) are provided with matching threaded connection parts (11), and when the valve stem (6) rotates, axial displacement is generated. A sealing structure is provided between the valve body (1) and the valve stem (6) above the threaded connection part (11); A detachable cover at the upper end of the valve body (1) is provided with a protective sleeve (15); the exposed parts of the valve stem (6) and the sealing sleeve (12) are located in the inner cavity of the protective sleeve (15); the protective sleeve (15) is deformed by a copper gasket (16) disposed in the protective sleeve (15) to be sealed and connected to the valve body (1).

2. A safety filling valve according to claim 1, characterized in that: The bottom of the valve body (1) is connected to a sleeve joint (8) which is sleeved outside the ejector pin (7) and has a clearance fit therewith. The sleeve joint (8) is provided with an axially limited locking nut (9) on its outer sleeve, and the locking nut (9) is screwed and fixed to the valve stem (3).

3. A safety filling valve according to claim 2, characterized in that: When the air valve (3) is locked, the upper end surface of the air valve (3) contacts the lower end surface of the sleeve joint (8), and the two are sealed and connected via a matching conical sealing surface (10).

4. A safety filling valve according to claim 1, characterized in that: The sealing structure comprises a sealing sleeve (12) arranged at the upper end of the valve body (1), and the valve stem (6) is rotatably arranged in the sealing sleeve (12).

5. A safety filling valve according to claim 4, characterized in that: The sealing structure comprises a high-pressure sealing ring (13) sleeved on the valve stem (6); a limiting step (14) cooperating with the high-pressure sealing ring (13) is arranged in the valve body (1); the upper and lower end surfaces of the high-pressure sealing ring (13) are respectively in contact with the sealing sleeve (12) and the limiting step (14); and the inner and outer peripheral surfaces are respectively in contact with the valve stem (6) and the valve body (1).

6. A safety filling valve according to claim 1, characterized in that: The refrigerant outlet (2) of the valve body (1) is connected to a threaded joint (17).

7. A safety filling valve according to any one of claims 1 to 6, characterized in that: The safety filling valve is installed in a high-pressure refrigeration system, the refrigerant of the high-pressure refrigeration system is R744, and the pressure is 7-13Mpa.

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