WO2016119553A1 - Shut-off valve - Google Patents

Abstract

A shut-off valve, comprising: a valve body (1) provided with a flow channel (11) therein; a valve base (2) provided at a lower end of the valve body (1), and provided with a valve port (21) thereon; and a valve stem (3) provided in the valve body (1) and for mating with the valve port (21) to open or close the flow channel (11); and further comprising a filling valve core (4). The valve stem (3) is further provided with a filling channel (31) and a filling valve port (32) thereon. The filling valve core (4) is provided in the filling channel (31) and elastically abuts the filling valve port (32) from a side of the flow channel (11), and the filling valve core (4) mates with the filling valve port (32) to open or close the filling channel (31) by means of a change in fluid pressure difference between the filling channel (31) and the flow channel (11). The shut-off valve satisfies requirements of different refrigeration systems, and has a simple structure and lower costs, and facilitates control.

Description

Globe valve

The present application claims priority to Chinese Patent Application No. 201510046783.1, the entire disclosure of which is incorporated herein by reference.

Technical field

The invention relates to the technical field of control components of a refrigeration system, and in particular to a shut-off valve for controlling the flow passage of a refrigerant.

Background technique

At present, as people's production and living requirements for environmental conditions continue to increase, the requirements for the performance of refrigeration systems for home, office and production are also increasing. The basic components of a refrigeration system are compressors, condensers, throttling devices, and evaporators, as well as other auxiliary components such as shut-off valves. The shut-off valve is used as the connecting valve between the indoor unit and the outdoor unit of the refrigeration system. When the equipment is installed at the factory, the outdoor unit can be evacuated according to requirements, and the refrigerant is filled, and the refrigerant is stored by closing the shut-off valve; for example, repairing the air conditioner In the refrigeration system, the refrigeration system is also connected to the maintenance equipment through a shut-off valve, thereby completing the operation of evacuating and filling the refrigerant. The current shut-off valve uses a common shut-off valve filling nozzle because of its connection interface and filling nozzle, because the valve core protrudes from the valve body, causing the valve body to forge a decrease in the product rate. In order to improve the technique, a shut-off valve structure used in the refrigeration system shown in Fig. 1 is disclosed in the document of Chinese Patent ZL201310129195.5. In this configuration, the filling nozzle is placed on the valve stem to solve the drawbacks of poor sealing performance existing in the prior art, and to reduce the material cost and provide the manufacturing yield.

However, this structure does not replace the "valve core" component with complicated structure, and the "valve core" has a complicated structure, and the sealing portion in the cold/hot environment is easily loosened, thereby affecting the sealing performance. On the other hand, when charging the refrigerant, the valve core of the "valve core" is opened by mechanical means, and at the same time, the "valve core" is fixed by the filling method, and the opening amount of the valve opening is fixed after opening the valve port. The charging curve is shown in Figure 2. It cannot be optimized according to the needs of the system. It is also necessary to use other auxiliary equipment to confirm whether the set value has been filled and to manually close the filling valve port. In particular, the above defects cannot be adapted to the control needs of various large-capacity commercial refrigeration equipment that have been continuously introduced in recent years.

Summary of the invention

In view of the above problems, the present invention provides a shutoff valve including: a valve body having a flow passage therein; a valve seat, the valve seat being disposed at a lower end portion of the valve body, and a valve disposed thereon a valve stem, the valve stem is disposed in the body and cooperates with the valve port to open or close the flow passage; includes a filling valve core, and the valve stem is further provided with a charging passage and Filling the valve port, the charging spool is disposed in the charging passage and elastically abuts the filling valve port from one side of the circulation passage, the charging spool passes the charging A change in fluid pressure differential between the passage and the flow passage cooperates with the fill valve port to open or close the fill passage.

As the above-described shutoff valve, further, an end of the charging spool facing the filling valve port has a center end surface and a guiding tapered surface extending along the center end surface.

Preferably, the central end surface is specifically a circular plane, and the diameter (D1) of the circular plane is larger than 1/2 of the diameter (D2) of the filling valve port.

Preferably, the central end surface of the filling valve core is specifically a circular arc surface concave toward the axial center.

Further, the valve stem has a stage in which a diameter becomes large toward an outer peripheral portion of one end of the circulation passage, and the charging spool is disposed in a charging passage opposite to the large stage.

Further, the valve seat and the valve body are in a separate structure. The valve stem is loaded into the flow passage from a lower end portion of the valve body, and has a seal portion of the flow passage at a transition section of the large stage.

Preferably, the filling spool is made of a non-metallic material.

Further, a stopper is disposed at an end of the valve stem facing the circulation passage, and an abutment spring is disposed between the stopper and the charging spool.

Preferably, the stop is in particular a retaining ring that is riveted to the valve stem (11).

Further, a stepped hole or a tapered hole filled with a fluid is provided in the filling passage of the valve stem.

The shut-off valve provided by the invention opens or closes the filling passage through the fluid pressure difference between the filling passage and the circulation passage, and can set the opening value of the filling valve core without the need for personnel control, thereby reducing the occurrence of errors. The filling process is more reliable, and in the charging phase, as the pressure difference is reduced, the opening of the valve port is reduced, the filling amount per unit time is also reduced, and the charging can be performed smoothly. Moreover, the present invention can obtain a filling process curve by adjusting the structure of the filling valve core and the valve stem, and can Optimized according to the needs of different refrigeration systems to meet the needs of refrigeration equipment of different specifications, different capacities and different use environments, the structure is simple, the cost is low, and the control is convenient.

DRAWINGS

Figure 1 is a cross-sectional view of a prior art shutoff valve;

2 is a graph of charging time per unit time of a prior art shut-off valve during charging;

Figure 3 is a cross-sectional view showing a specific embodiment of a shutoff valve according to the present invention;

Figure 4 is an anatomical view of the valve stem of Figure 3 equipped with a filling spool;

Figure 5 is a cross-sectional view of the charging spool of Figure 3;

Figure 6a is a filling curve of the shut-off valve according to the present invention during charging;

Figure 6b is a charging curve of the shut-off valve according to the present invention during the charging process;

Figure 7 is a cross-sectional view of another embodiment of a filling spool;

Figure 8 is a cross-sectional view of another embodiment of the valve stem of the present invention.

The symbols in the figure indicate:

1-valve body, 11-flow passage;

12-lower interface, 13-upper interface, 14-transverse interface;

2-valve, 21-valve, 22-step surface;

3/3'-valve, 31-filling passage;

32-fill valve port, 33-stage;

34-transition section, 34-seal portion;

35-stepped hole, 36-conical hole, 37-lower end;

4/4'-filling spool;

41/41'-center end face, 42-guide cone face;

5-stop;

6- abutting spring;

7-sealing ring.

detailed description

In order to enable those skilled in the art to better understand the technical solution of the present invention, the following is attached The invention and its detailed description are further described in detail.

3 is a cross-sectional view of a specific embodiment of a shutoff valve according to the present invention, FIG. 4 is an exploded view of the valve stem of FIG. 3 equipped with a filling valve core, and FIG. 5 is a charging spool of FIG. .

As shown in Figure 3, Figure 4 and Figure 5. The shut-off valve for the refrigeration system is generally disposed on the outdoor unit of the refrigeration system, including the valve body 1 formed by forging or casting, and the valve body 1 is a "three-way" structure that penetrates internally to form the flow passage 11 and has Three ports. Generally, the lower end interface 12 of the valve body 1 is in communication with the outdoor unit piping, and the horizontal interface 14 is connected to the indoor unit of the refrigeration system through the connecting pipe. When it is necessary to repair or assemble the refrigeration system, it is necessary to close the circulation passage 11, that is, to cut off the refrigerant passage between the lateral interface 14 and the lower end interface 12.

The valve stem 3 has a columnar structure in the form of a through cavity inside, and a hexagonal or rectangular inner hole (not shown) may be provided at the upper end of the through cavity. The valve stem 3 is screwed upward from the lower end port 12 of the valve body 1 into the interior of the valve body 1. The outside of the valve seat 2 has a stepped surface 22 through which the valve seat 2 abuts against the valve body 1 for axial positioning and is fixed to the lower end portion of the valve body 1 by welding. The upper end portion of the valve seat 2 forms a valve port 21. The lower end portion 37 of the valve stem 3 has a tapered shape.

In operation, a hexagonal or rectangular tool can be inserted from the upper end interface 13 of the valve body 1 into the upper end of the valve stem 3 to drive the valve stem 3 to rotate, and move up and down by the threaded web to make the cone shape of the valve stem 3 The lower end portion 37 is in contact with or separated from the valve port 21 of the valve seat 2, thereby opening or closing the flow passage 11.

In the present embodiment, the through cavity in the valve stem 3 is specifically used as the charging passage 31, and a stepped hole is provided in the charging passage 31 as the filling valve port 32. The charging passage 31 communicates with the flow passage 11 through the filling valve port 32.

The charging spool 4 is loaded into the charging passage 31 from one side of the circulation passage 11 (i.e., from the side opposite to the upper end port 13 of the valve body 1). As a retaining ring of the stopper 5, the crimping is fixed to the lower end portion 37 of the valve stem 3 facing the flow passage 11. An abutment spring 6 is disposed between the charging spool 4 and the stopper 5 such that the charging spool 4 elastically abuts against the filling valve port 32. The pressure parameters of the abutment spring 6 can be set according to system requirements.

When the normal state, the charging spool 4 abuts the filling valve port 32 to close the charging passage 31; when the upper end interface 13 of the valve body 1 of the shutoff valve is connected to the filling device, the charging spool 4 faces the filling valve The end of the port 32 is subjected to a pressure F1 which is applied downward by the filling liquid in the filling device and tends to open the filling passage 31; at the same time, the filling valve core 4 is also subjected to the pressure F2 of the abutting spring and the inside of the flow passage 11 respectively. The fluid pressures F3, F2 and F3 are opposite to the direction of F1.

When the pressure F3 of the fluid in the circulation passage 11 is high, when the filling is not required, that is, when F1<F2+F3, the filling valve port 32 is closed, the closing valve is not filled with the refrigerant; when the pressure of the fluid in the circulation passage 11 is F3 When the filling is required, that is, when F1>F2+F3, the charging spool 4 moves downward to open the filling valve port 32 to realize liquid filling.

The upper end portion of the charging spool 4 is provided as a central end surface 41 of the center portion, and a guiding tapered surface 42 extending toward the edge along the center end surface 41. As a further preferred embodiment, in the present embodiment, the center end surface 41 may be provided in a circular plane. The circular plane receives the fluid pressure F1 in the filling device from the vertical direction, which can reduce the fluctuation caused by the instability of the external fluid pressure and reduce the control error. The guiding cone surface 42 is subjected to a certain fluid pressure, so that the filling valve core 4 has a centripetal balance component, which makes the valve core opening process more stable. In order to adapt to the change of the refrigerant charging pressure of the general refrigeration equipment, when the diameter D1 of the circular plane is larger than 1/2 of the diameter D2 of the filling valve port 32 (ie, D1>1/2D2), the operation of the filling valve core 4 is performed. More stable and reliable.

Of course, those skilled in the art can also carry out various extension designs on the filling valve core to improve the pressure stability of the fluid according to the technical suggestion given by the present invention. Figure 7 is a cross-sectional view of another embodiment of a fill spool. As shown in Fig. 7, in the specific embodiment, the central end surface 41' of the filling valve body 4' is specifically a concave arc surface, which can also achieve the effects of the foregoing scheme, and will not be described herein.

As a further preferred embodiment, specifically in the present embodiment, the valve stem 3 has a stage 33 having a larger diameter at one end toward the flow passage 11, and the filling spool is disposed in the opposite filling passage 31 of the large stage 33. The transition portion in which the diameter of the large stage 33 becomes large is provided as a tapered step surface, and has a seal portion 34 on the tapered step surface. After the valve stem 3 is rotated upward to open the valve port 21, the upward movement is continued until the sealing portion 34 abuts the corresponding stop sealing portion of the valve body 1 disposed in the circulation passage 11, and the valve stem 3 can be realized. The upper stop positioning and the circulation passage 11 realize a hard seal (which belongs to the second seal, and the seal ring 7 on the outer peripheral surface of the valve stem 3 performs the first soft seal), and the structure can effectively utilize the thickness of the valve stem material and is compact in design. To make the product miniaturized.

In the above solution, the valve seat 2 and the valve body 1 may have a unitary structure. However, since the valve stem 3 has a large diameter step underneath, a preferred design is that the valve seat 2 and the valve body 1 adopt a separate structure. At the time of assembly, the valve stem 3 is first loaded into the flow passage 11 from the lower end portion of the valve body 1, and the valve seat 2 is welded to the lower end of the valve body 1.

In order to further improve the stability of the charging spool during the filling process, in this example, in the filling passage 31 of the valve stem 11, a stepped hole 35 is provided as a fluid near the filling valve port 32. guide. Thus, after the fluid enters the charging passage 31, it passes through the stepped hole 35, so that the fluid pressure is concentrated into the center hole through the filling valve port 32.

Of course, other ways can also be used to achieve the above effects. A cross-sectional view of another embodiment of a valve stem is given in FIG. As shown in Figure 8. Different from the foregoing, in the present embodiment, in the filling passage 31 of the valve stem 11 near the filling valve port 32, a tapered hole 36 having a more effective flow guiding effect is provided, and the fluid pressure is more stable.

As can be seen from the foregoing description, the opening/closing of the filling passage 31 is related to the relationship between F1, F2 and F3. In addition, it is related to the weight of the filling valve body 4 itself. Since the angle of the shut-off valve installation in the system equipment may be various, the influence factor of the weight of the filling valve core 4 is uncertain. In order to reduce the factors, the filling valve core is preferably made of a lighter material, such as a non-metallic engineering plastic material, to reduce the influence on the set parameters.

The technical idea of the present invention has been described above in connection with specific facts. The invention is advantageous in that the standardized "valve core" is eliminated, depending on the different characteristics of the system and the working environment and mode of the equipment. The pressure point for starting and closing the refrigerant charge is preset and the charging process is controlled. For example, the amount of charge per unit time, the filling time, etc., are especially suitable for the control needs of large-capacity commercial refrigeration equipment. The following can be further explained.

Fig. 6a and Fig. 6b are two charging curves of the shutoff valve given in the charging process of the present invention.

As shown in Figure 6a. The different devices in which the shut-off valve according to the present invention is installed include the device 1, the device 2, and the device 3. For example, the parameters of the filling valve ports of the respective shut-off valves are the same, and the pressures of the refrigerant systems before filling each device are different. When the filling spool is opened, the valve opening is different, but the curves are basically parallel.

As shown in Figure 6b. The different devices in which the shut-off valve according to the present invention is installed include the device 1', the device 2' and the device 3'. For example, the parameters of the filling valve ports of the respective shut-off valves are different, and the pressures of the refrigerant systems before filling each device are different. When the valve plug is opened, the degree of opening of the valve port is different, but the curve change mode can be flexibly designed to complete the charging in substantially the same time.

The above parameters can be designed by changing the size of the filling valve port and the end face area of the valve plug. The pressure of the spring is realized, and will not be described here.

The shut-off valve assembly provided by the present invention has been described in detail above. This article applies specific The principles and embodiments of the present invention have been described by way of example, and the description of the above embodiments is merely for assisting in understanding the method of the present invention and its core idea. It should be noted that those skilled in the art can make various modifications and changes to the present invention without departing from the spirit and scope of the invention.

Claims (10)

A shut-off valve includes: a valve body (1), the valve body (1) is provided with a circulation passage (11); a valve seat (2), the valve seat (2) is disposed at a lower end of the valve body (1), and is provided with a valve port (21); a valve stem (3), the valve stem (3) being disposed in the body (1) and configured to open or close the flow passage (11) by cooperating with the valve port (21) The utility model is characterized in that it further comprises a filling valve core (4), and the valve rod (3) is further provided with a charging passage (31) and a filling valve port (32), and the charging valve core (4) is arranged In the charging passage (31) and elastically abutting the filling valve port (32) from one side of the circulation passage (11), the charging spool (4) passes the charging A change in fluid pressure difference between the passage (31) and the flow passage (11) cooperates with the fill valve port (32) to open or close the fill passage (31). The globe valve according to claim 1, wherein an end of said charging spool (4) facing said charging valve port (32) has a central end surface (41) and said central end surface (41) A guide tapered surface (42) extending toward the edge. The globe valve according to claim 2, wherein said central end surface (41) is specifically a circular plane, and a diameter (D1) of said circular plane is larger than a diameter (D2) of said filling valve port (32) 1/2. The globe valve according to claim 2, characterized in that the central end surface (41) of the filling valve core (4) is specifically a circular arc surface concave toward the shaft center. A shut-off valve according to claim 1, wherein said valve stem (3) has a stage (33) having a larger diameter at an outer peripheral portion toward one end of said circulation passage (11), said filling valve The core is disposed in a charging passage (31) opposite the large stage (33). The globe valve according to claim 5, characterized in that the valve seat (2) and the valve body (1) are of a separate structure. The valve stem (3) is loaded into the circulation passage (11) from a lower end portion of the valve body (1), and has the circulation passage on a variable diameter transition section of the large stage (33) ( 11) Sealing portion (34). A shut-off valve according to any of claims 1-6, characterized in that the filling valve core (4) is made of a non-metallic material. A shut-off valve according to any one of claims 1 to 6, characterized in that a stopper (5) is provided at an end of the valve stem (3) facing the circulation passage (11). An abutting spring (6) is disposed between the stopper (5) and the charging spool (4). A shut-off valve according to claim 8, characterized in that the stop (5) is in particular a retaining ring that is riveted to the valve stem (11). A shut-off valve according to any one of claims 1 to 6, characterized in that a filling fluid-oriented stepped hole (35) or a taper is provided in the filling passage (31) of the valve stem (11). Hole (36).

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