Refrigerant filling valve with exhaust function and filling method

Abstract

The present invention discloses a refrigerant filling valve with an exhaust function, which includes a valve body, a medium inlet, and a medium outlet. A valve core controlled by a valve rod for opening and closing is provided inside the valve body. An exhaust hole is formed in the valve body. A first sealing ring, a second sealing ring, and a third sealing ring are sequentially arranged between the valve body and the valve core. The exhaust hole is located between the first sealing ring and the second sealing ring. By the above filling method, the present invention not only has good filling sealing performance, but also after the filling is completed, the medium can be discharged through the exhaust hole to achieve the technical performance of the same pressure inside and outside the valve body, preventing the technical problem that the refrigerant filling valve cannot be separated from the filling joint.

Description

Technical Field

[0001] The present invention belongs to the technical field of valves and relates to a refrigerant filling valve with an exhaust function. Background Art

[0002] One way of refrigerant filling is to fill through the side hole (multi-purpose passage) of the compressor exhaust valve (high-pressure valve), which is called high-pressure end filling, and the refrigerant liquid is added. Its characteristics are safety and rapidity, and it is suitable for the first filling of the refrigeration system, that is, the system filling after leak detection and vacuum pumping. However, when using this method, it must be noted that the compressor cannot be started during filling (the engine is stopped), and the refrigerant tank is required to be inverted. The other way is to fill through the side hole (multi-purpose passage) of the compressor suction valve (low-pressure valve), which is called low-pressure end filling, and the refrigerant gas is filled. Its characteristic is slow filling speed, and it can be used when the system replenishes refrigerant. For the filling valves used in these two methods, there is a certain space between the inside of the valve body and the connection joint on the equipment after filling. The gas in this space is often low-pressure gas or in a low-pressure state, which causes the connection joint between the filling valve and the equipment to be filled to be unable to be separated under the action of the external atmospheric pressure. The present invention studies the technical problem of how to quickly separate the connection joint between the filling valve and the equipment to be filled and avoid the pressure difference. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the present invention provides a refrigerant filling valve with an exhaust function, which has a simple structure, convenient separation and easy use.

[0004] The specific solution of the present invention is as follows: A refrigerant filling valve with an exhaust function includes a valve body, a medium inlet, and a medium outlet. A valve core controlled by a valve rod to open and close is provided inside the valve body, and an exhaust hole is opened on the valve body; a first sealing ring, a second sealing ring, and a third sealing ring are arranged in sequence between the valve body and the valve core; the exhaust hole is located between the first sealing ring and the second sealing ring. This kind of refrigerant filling valve uses the second sealing ring and the third sealing ring to form a sealed space during refrigerant filling to prevent leakage, and after filling, it exhausts externally through the exhaust hole, so that the internal and external air pressures of the refrigerant filling valve are atmospheric pressure, avoiding the technical problem that the connection joint between the refrigerant filling valve and the filling equipment cannot be separated due to the low pressure inside the refrigerant filling valve.

[0005] One end of the valve rod is clamped and connected to a handwheel through a gasket and a nut, and a push rod and a fifth sealing ring are provided at the other end of the valve rod. The fifth sealing ring cooperates to seal the valve core; a fourth sealing ring is provided between the valve body and the valve rod to prevent refrigerant from leaking.

[0006] A first spring and a valve core are sleeved on the outer periphery of the valve stem between the fifth sealing ring and the valve body. The valve stem drives the fifth sealing ring to cooperate with the valve core under the control of the handwheel to realize the opening and closing of the valve core. The first spring has the function of resetting the valve core.

[0007] A filling joint connected by a quick connector is installed at the medium outlet to realize the quick connection performance of the filling joint.

[0008] The quick connector includes steel balls and an outer sleeve installed in the installation hole; a second spring and a snap ring are respectively arranged between the outer sleeve and the valve body; the installation hole is located on the valve wall of the valve body.

[0009] An air passage hole is provided at the end of the valve core to prevent the technical problem that a sealed space is formed after the valve core is attached to the filling joint and cannot be opened under negative pressure.

[0010] An air valve is provided in the filling joint. The air valve is of a valve core structure, and the valve core structure includes a valve core rod matched with a first valve core. This kind of air valve structure is simple and reliable in opening and closing.

[0011] A filling method for a refrigerant filling valve with an exhaust function, the filling method includes the following steps:

[0012] 1. Rotating the handwheel drives the valve stem, so that the valve core is separated from the fifth sealing ring on the valve stem, the ejector rod pushes open the valve core structure of the valve core, the first valve core and the valve core rod are in an open state, and the refrigerant or medium flows out through the medium inlet, the valve core, the valve core structure, and the medium outlet for filling. At this time, the outer wall of the valve core is hermetically fitted with the second sealing ring and the third sealing ring to prevent the refrigerant from leaking;

[0013] 2. After filling is completed, rotating the handwheel in the reverse direction drives the valve stem, so that the valve core is hermetically fitted with the fifth sealing ring on the valve stem, the valve core structure is closed, the first valve core and the valve core rod are in a closed state, and the cavity in the valve body between the valve stem and the filling joint remains with the refrigerant or medium. The remaining refrigerant or medium is discharged through the exhaust hole. At this time, the outer wall of the valve core is hermetically fitted with the first sealing ring.

[0014] Through the above filling method, the present invention not only has good filling sealing performance, but also after filling is completed, the medium can be discharged through the exhaust hole to achieve the technical performance of the same pressure inside and outside the valve body, preventing the technical problem that the refrigerant filling valve cannot be separated from the filling joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view structural schematic diagram of the refrigerant filling valve with an exhaust function of the present invention;

[0016] Figure 2 It is a structural schematic diagram of the refrigerant filling valve with an exhaust function of the present invention in the filling state;

[0017] Figure 3 This is a schematic structural diagram of the exhaust state of the refrigerant filling valve with an exhaust function according to the present invention. Specific embodiments

[0018] As Figures 1-3 As shown, a refrigerant filling valve with an exhaust function includes a valve body 7, a medium inlet 20, and a medium outlet 26. A valve core 19 controlled by a valve stem 5 is provided inside the valve body 7. An exhaust hole 17 is opened on the valve body 7. After the filling is completed, the medium can be discharged through the exhaust hole to achieve the technical performance of the same pressure inside and outside the valve body, and prevent the technical problem that the refrigerant filling valve and the filling joint cannot be separated.

[0019] As a structural preference, a first sealing ring 8, a second sealing ring 18, and a third sealing ring 14 are arranged in sequence between the valve body 7 and the valve core 19. The exhaust hole 17 is located between the first sealing ring 8 and the second sealing ring 18 to achieve the technical effect that the refrigerant filling medium does not leak during filling and can be exhausted after the filling is completed.

[0020] To achieve the effective control performance of the refrigerant filling valve, one end of the valve stem 5 is clamped and connected to the handwheel 2 through a gasket 3 and a nut 1. The other end of the valve stem 5 is provided with a push rod 16 and a fifth sealing ring 27. A fourth sealing ring 4 is provided between the valve body 7 and the valve stem 5. A first spring 6 and a valve core 19 are sleeved on the outer periphery of the valve stem 5 between the fifth sealing ring 27 and the valve body 7. By controlling the forward and backward movement of the valve stem 5 through the handwheel 2, the opening and closing performance between the fifth sealing ring 27 and the valve core 19 is achieved.

[0021] To achieve the fast connection performance, a filling joint 24 connected by a quick connector is installed at the medium outlet 26. The quick connector includes a steel ball 12 installed on the installation hole 21 and an outer sleeve 10. A second spring 11 and a snap ring 13 are respectively provided between the outer sleeve 10 and the valve body 7. The installation hole 21 is located on the valve wall of the valve body 7. When the filling joint 24 needs to be connected, the outer sleeve 10 is manually moved backward so that the steel ball 12 can partially move out of the installation hole 21. The filling joint 24 is inserted into the inside of the valve body 7, and then the outer sleeve 10 is relaxed to push the steel ball 12 into the installation hole 21 and fit into the groove of the outer shaft of the filling joint 24 to limit and connect the filling joint 24. To prevent negative pressure, an air passing hole 15 is provided at the end of the valve core 19.

[0022] As a structural preference, an air valve is provided inside the filling joint 24. The air valve is a valve core structure, and the valve core structure includes a valve core rod 22 matched with a first valve core 23 to control the opening and closing of the filling joint 24.

[0023] A filling method for a refrigerant filling valve with an exhaust function includes the following steps:

[0024] 1. The rotation of the handwheel 2 drives the valve stem 5, causing the valve core 19 to separate from the fifth sealing ring 27 on the valve stem 5. The ejector rod 16 pushes open the valve core structure, and the first valve core 23 and the valve core rod 22 are in the open state. The refrigerant or medium flows out for filling through the medium inlet 20, the valve core 19, the valve core structure, and the medium outlet 26. At this time, the filling joint 24 is opened, and the outer wall of the valve core 19 is hermetically fitted with the third sealing ring 14 and the second sealing ring 18 to prevent the medium from leaking.

[0025] 2. After the filling is completed, the handwheel 2 rotates in the reverse direction to drive the valve stem 5, causing the valve core 19 to be hermetically fitted with the fifth sealing ring 27 on the valve stem 5. The valve core structure is closed, the first valve core 23 and the valve core rod 22 are in the closed state, and there is residual refrigerant or medium in the cavity of the valve body 7 between the valve stem 5 and the filling joint 24. The residual refrigerant or medium is discharged through the exhaust hole 17. At this time, the outer wall of the valve core 19 is hermetically fitted with the first sealing ring 8.

[0026] Through the above filling method, the outer wall of the valve core 19 is hermetically fitted with the third sealing ring 14 and the second sealing ring 18 during filling to prevent the medium from leaking. Moreover, after the filling is completed, the medium can be discharged through the exhaust hole to achieve the technical performance of the same pressure inside and outside the valve body, preventing the technical problem that the refrigerant filling valve cannot be separated from the filling joint.

[0027] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways of substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0028] The terms such as the structural names used herein are not excluded from the possibility of using other terms. The use of these terms is only to more conveniently describe and explain the essence of the present invention, and interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A refrigerant charging valve with an exhaust function, comprising a valve body (7), a medium inlet (20), a medium outlet (26), and a valve stem (5). A valve core (19) controlled to open and close by the valve stem (5) is provided inside the valve body (7), and it is characterized in that: An exhaust hole (17) is formed in the valve body (7); a first sealing ring (8), a second sealing ring (18), and a third sealing ring (14) are arranged in sequence between the valve body (7) and the valve core (19); the exhaust hole (17) is located between the first sealing ring (8) and the second sealing ring (18); one end of the valve stem (5) is clamped and connected to the handwheel (2) through a gasket (3) and a nut (1), and a push rod (16) and a fifth sealing ring (27) are arranged at the other end of the valve stem (5); a fourth sealing ring (4) is arranged between the valve body (7) and the valve stem (5); a filling joint (24) connected through a quick connector is installed at the medium outlet (26), and an air valve is arranged in the filling joint (24); a first spring (6) and a valve core (19) are sleeved on the outer periphery of the valve stem (5) between the fifth sealing ring (27) and the valve body (7).

2. The refrigerant charging valve with an exhaust function according to claim 1, characterized in that: The quick connector includes a steel ball (12) and an outer sleeve (10) installed on the installation hole (21); a second spring (11) and a snap ring (13) are respectively arranged between the outer sleeve (10) and the valve body (7); the installation hole (21) is located on the valve wall of the valve body (7).

3. The refrigerant charging valve with an exhaust function according to claim 2, characterized in that: An air passing hole (15) is formed at the end of the valve core (19).

4. The refrigerant charging valve with an exhaust function according to claim 3, characterized in that: The air valve is of a valve core structure, and the valve core structure includes a first valve core (23) and a valve core rod (22) matched with the first valve core (23).

5. The filling method of the refrigerant filling valve with an exhaust function according to claim 4, characterized in that: The filling method includes the following steps:

1. Rotating the handwheel (2) drives the valve stem (5), so that the valve core (19) is separated from the fifth sealing ring (27) on the valve stem (5), the push rod (16) pushes open the valve core structure, the first valve core (23) and the valve core rod (22) are in an open state, and the refrigerant flows out through the medium inlet (20), the valve core (19), the valve core structure, and the medium outlet (26) for filling. At this time, the outer wall of the valve core (19) is hermetically matched with the third sealing ring (14) and the second sealing ring (18).

2. After filling is completed, rotating the handwheel (2) in the reverse direction drives the valve stem (5), so that the valve core (19) is hermetically matched with the fifth sealing ring (27) on the valve stem (5), the valve core structure is closed, the first valve core (23) and the valve core rod (22) are in a closed state, and the cavity in the valve body (7) between the valve stem (5) and the filling joint (24) remains with refrigerant, and the remaining refrigerant is discharged through the exhaust hole (17). At this time, the outer wall of the valve core (19) is hermetically matched with the first sealing ring (8).

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