Balanced valve spool for replacement thermostatic expansion valve

Abstract

The utility model discloses a replaceable heat power expansion valve balance valve port type valve core, including the casing, the casing includes upper casing and lower casing, the upper casing upper end is provided with heat pack subassembly, the lower casing surface one side is provided with medium inlet, the lower casing lower extreme middle part is fixed with medium outlet, be provided with balance valve core subassembly between the upper casing and lower casing inside, balance valve core subassembly inside is provided with the control mechanism for controlling medium flow. The utility model for use effect is good, because increased an upper chamber on the piston upper end, to make piston up and down can realize pressure balance, like this makes the valve stem, valve core part of this device all not be affected by the import, export medium pressure change, through this balanced structure design, can more adapt to the operation harsh system, reduce system manufacturing cost, and can ensure that user system host long period is under safe working condition operation.

Description

Technical Field

[0001] This utility model relates to the field of valve core technology, specifically to a replaceable thermostatic expansion valve balance valve port type valve core. Background Technology

[0002] The balanced valve core of a thermostatic expansion valve (hereinafter referred to as: balanced valve core) is a widely used independent main component in split-type thermostatic expansion valves.

[0003] However, the existing balanced valve cores have the following drawbacks: conventional (unbalanced) valve cores are easily affected by changes in system medium pressure (flow rate). When the back pressure is too high (instantaneous load increase), the valve port is easy to close and cannot be properly controlled by the temperature sensing bulb (power head), which poses a risk of uncontrolled valve port closure. Therefore, a replaceable balanced valve core is needed to address the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a replaceable thermostatic expansion valve with a balance valve port type valve core to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a replaceable thermostatic expansion valve with a balanced valve port type valve core, comprising a housing, the housing including an upper housing and a lower housing, a heat pack assembly disposed at the upper end of the upper housing, a medium inlet disposed on one side of the surface of the lower housing, a medium outlet fixedly disposed at the middle of the lower end of the lower housing, a balanced valve core assembly disposed between the upper housing and the lower housing, and a control mechanism for controlling the flow of the medium disposed inside the balanced valve core assembly, the control mechanism including a valve stem, a valve core chamber, and a valve stem cavity. The valve core assembly comprises a valve core body, a piston, a drainage channel, a through hole, and an upper chamber. A valve stem is movably inserted into the middle of the inner side of the balance valve core assembly. A valve core chamber is provided at the lower end of the balance valve core assembly. The valve core body is fixedly installed at the lower end of the valve stem. A piston is fixedly installed in the middle of the valve stem. The piston is movably engaged inside the balance valve core assembly. A through hole is opened on the inner side of the valve stem. A through hole is opened on the surface of the valve stem at the upper end of the piston. The through hole communicates with the drainage channel. An upper chamber is provided at the upper end of the piston inside the balance valve core assembly.

[0006] Preferably, an "O"-ring rubber ring is provided in the middle of the piston surface, and a sealing gasket is provided on the surface of the balance valve core assembly. The "O"-ring rubber ring can ensure the sealing of the piston inside the balance valve core assembly within the valve core body; while the sealing gasket can ensure the sealing of the balance valve core assembly installed inside the upper and lower housings.

[0007] Preferably, the outer side of the balance valve core assembly is provided with a superheat component adjustment mechanism that adjusts the threshold for the heat pack assembly to push the valve stem downward. The superheat component adjustment mechanism includes an upper top plate, an adjustment plate, and a spring. The upper top plate is fixedly installed at the upper end of the valve stem. The adjustment plate is screwed onto the outer surface of the balance valve core assembly. A spring is sleeved between the adjustment plate and the upper top plate. By adjusting the compression threshold of the spring, the more severely the spring is compressed, the more difficult it is for the heat pack assembly to expand and push the valve stem downward, and vice versa.

[0008] Preferably, the upper end of the valve stem is connected to the heat pack assembly. When the heat pack assembly expands, it can push the valve stem downward, thereby pushing the valve core body downward, thus making the valve core chamber open. The maximum downward stroke of the valve core body in this device is 1.3mm.

[0009] Preferably, the drainage channel has a diameter of φ3mm and the through hole has a diameter of φ0.8mm.

[0010] Preferably, a fixing bolt is provided between the upper housing and the lower housing to fix the upper housing and the lower housing together. This allows the balance valve core assembly to be disassembled at any time when needed to replace or adjust the trigger threshold of the balance valve core.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. Because the valve core body, valve stem, and piston form a balanced structure, the valve core is only driven by the temperature (pressure) change sensed by the temperature sensing bulb to change the corresponding position (opening degree) of the valve port, and is not affected by the changes in valve inlet and outlet pressure, thus ensuring the stability of the set load overheat.

[0013] 2. This utility model is more suitable for application in high-flow-rate refrigeration units, and is not affected by changes in valve inlet and outlet medium pressure (flow rate); through balanced structural design, it can better adapt to harsh operating systems, reducing system manufacturing costs; and it can ensure that the user's system host operates under safe conditions for a long period of time. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the balance valve port type valve core of the replaceable thermostatic expansion valve of this utility model;

[0015] Figure 2 This is an exploded view of the overall structure of the valve core of the replaceable thermostatic expansion valve of this utility model.

[0016] Figure 3 This is a cross-sectional view of the balance valve core assembly in the replaceable thermostatic expansion valve balance valve port type valve core of this utility model.

[0017] Figure 4This utility model relates to a replaceable thermostatic expansion valve with a balanced valve port type valve core. Figure 3 Enlarged view of point A in the middle;

[0018] Figure 5 This is an exploded view of the balance valve core assembly in the replaceable thermostatic expansion valve balance valve port type valve core of this utility model.

[0019] Figure 6 This is an open view of the valve core body in the valve core of the replaceable thermostatic expansion valve balance valve port type of this utility model.

[0020] Figure 7 This is an exploded view of the valve stem and piston in the valve core of the replaceable thermostatic expansion valve of this utility model.

[0021] In the diagram: 1. Upper housing; 2. Lower housing; 3. Heat pack assembly; 4. Medium inlet; 5. Medium outlet; 6. Balance valve core assembly; 7. Valve stem; 8. Valve core chamber; 9. Valve core body; 10. Piston; 11. Drainage channel; 12. Through hole; 13. Upper chamber; 14. "O" ring rubber ring; 15. Sealing gasket; 16. Top plate; 17. Adjusting plate; 18. Spring; 19. Fixing bolt. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figures 1-7 This utility model provides a technical solution: a replaceable thermostatic expansion valve with a balanced valve port type valve core, including a housing, which consists of an upper housing 1 and a lower housing 2, and the two are fixedly connected by fixing bolts 19. This connection method not only ensures the stability of the housing structure, but also facilitates disassembly when needed, so as to replace the internal balanced valve core assembly 6 or adjust its trigger threshold. A medium inlet 4 is provided on one side of the surface of the lower housing 2 for the medium to enter the valve body; a medium outlet 5 is provided in the middle of the lower end so that the medium can be discharged smoothly. A heat pack assembly 3 is installed at the upper end of the upper housing 1. This assembly expands or contracts when the temperature changes, thereby driving the valve stem 7 to move and realize the control of the valve opening.

[0024] The balance valve core assembly 6 is installed inside the upper housing 1 and the lower housing 2, and is the core component for controlling the flow of the medium. It contains a control mechanism, including a valve stem 7, a valve core chamber 8, a valve core body 9, a piston 10, a flow channel 11, a through hole 12, and an upper chamber 13.

[0025] A valve stem 7 is movably inserted into the middle of the inner side of the balance valve core assembly 6, and its upper end is connected to the heat pack assembly 3. When the heat pack assembly 3 expands, it can push the valve stem 7 downward; when it contracts, the valve stem 7 moves upward under the action of other forces. A piston 10 is fixedly installed in the middle of the valve stem 7, and the piston 10 is movably engaged inside the balance valve core assembly 6, dividing the internal space of the balance valve core assembly 6 into an upper chamber 13 and other lower spaces. A through hole 12 is opened on the inner side of the valve stem 7, and a through hole 12 is opened on the surface of the valve stem 7 at the upper end of the piston 10. This through hole 12 communicates with the interior of the drainage channel 11.

[0026] A valve core body 9 is fixedly mounted on the lower end of the valve stem 7. When the valve stem 7 moves downward under the action of the heat-shrink assembly 3, the valve core body 9 moves downward accordingly, opening the valve core chamber 8 and thus controlling the flow of the medium. The maximum downward stroke of the valve core body 9 is 1.3 mm. This precise stroke design ensures the accuracy of medium flow control.

[0027] An "O"-shaped rubber ring 14 is provided in the middle of the surface of the piston 10. This rubber ring can effectively ensure the sealing of the piston 10 inside the balance valve core assembly 6, prevent the medium from leaking between the upper chamber 13 and the lower space, and ensure the stability of valve control.

[0028] Drainage channel 11 and through hole 12: The specification of drainage channel 11 is φ3mm, and the specification of through hole 12 is φ0.8mm. This specification design ensures smooth flow of the medium inside the valve stem.

[0029] The surface of the balance valve core assembly 6 is provided with a sealing gasket 15. The sealing gasket 15 can ensure the sealing performance of the balance valve core assembly 6 when it is installed inside the upper housing 1 and the lower housing 2, prevent the medium from leaking from the connection between the housing and the balance valve core assembly 6, and improve the reliability and safety of the entire valve.

[0030] The outside of the balance valve core assembly 6 is provided with a superheat component adjustment mechanism for adjusting the threshold of the hot pack assembly 3 pushing the valve rod 7 downward. The mechanism includes an upper top plate 16, an adjustment plate 17 and a spring 18.

[0031] A top plate 16 is fixedly mounted on the upper end of the valve stem 7. An adjusting plate 17 is screwed onto the outer surface of the balance valve core assembly 6 via threads. A spring 18 is fitted between the adjusting plate 17 and the top plate 16. By rotating the adjusting plate 17, the compression threshold of the spring 18 can be changed. The more severely the spring 18 is compressed, the greater the force required to push the valve stem 7 downward when the heat pack assembly 3 expands, i.e., the more difficult it is to push the valve stem 7 downward; conversely, the less compressed the spring 18 is, the easier it is for the heat pack assembly 3 to push the valve stem 7 downward. This design allows the operator to flexibly adjust the superheat of the valve according to the actual working conditions to meet different usage requirements.

[0032] Working principle: When using this device, the valve stem 7 is controlled by the heat pack assembly 3. When the gas inside the heat pack assembly 3 expands, it can push the valve stem 7 to move down, which will cause the valve core body 9 to move down, thus opening the valve core chamber 8. Then the medium can flow through the medium inlet 4, the valve core chamber 8, and the medium outlet 5.

[0033] And such Figure 6 As shown, when the valve core body 9 is opened, for the valve core body 9, the medium pressure inside the flow channel acts on the lower plane and the upper inclined plane of the valve core body 9 with equal force. Although the upper inclined plane of the valve core has a larger area, its equivalent area in the horizontal direction is the same as the lower plane area of ​​the valve core. According to the pressure formula F=P×A, since the pressure P and area A are the same, the force on the valve core body 9 is equal. After the valve core body 9 is opened, the medium in the medium discharge port 5 can enter the upper chamber 13 through the flow channel 11 and the through hole 12. Thus, for the piston 10, the piston 10... Since the taper and area of ​​the upper and lower conical surfaces are the same, and the pressure of the medium entering the upper chamber 13 through the drainage channel 11 and through hole 12 is also the same as that below, the force on the upper conical surface of piston 10 is F1↓, and the force on the lower conical surface of piston 10 is F2↑. Thus, the forces on the upper and lower parts of piston 10 are F1↓=F2↑, and the forces are consistent. This ensures that the valve stem 7 and valve core body 9 of this device are not affected by changes in the inlet and outlet medium pressure. Through this balanced structural design, it is more adaptable to the operation of demanding systems, reduces the system manufacturing cost, and ensures that the user's system host operates under safe conditions for a long period of time.

[0034] Meanwhile, the device features a split housing design, which can be easily and quickly opened as needed, facilitating the replacement of the internal balance valve core assembly 6. Additionally, an adjustment mechanism is provided on the outside of the balance valve core assembly 6, which can adjust the downward trigger threshold of the valve stem 7 and the valve core body 9 when necessary, thereby significantly improving the applicability of the device.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A replaceable thermostatic expansion valve balancing valve core, comprising a housing, characterized in that: The housing includes an upper housing (1) and a lower housing (2). A heat pack assembly (3) is provided at the upper end of the upper housing (1). A medium inlet (4) is provided on one side of the surface of the lower housing (2). A medium outlet (5) is fixedly provided at the middle of the lower end of the lower housing (2). A balance valve core assembly (6) is provided between the upper housing (1) and the lower housing (2). A control mechanism for controlling the flow of medium is provided inside the balance valve core assembly (6). The control mechanism includes a valve stem (7), a valve core chamber (8), a valve core body (9), a piston (10), a drainage channel (11), a through hole (12), and an upper chamber (13). A valve stem (7) is movably inserted in the middle of the inner side of the component (6). A valve core chamber (8) is provided at the lower end of the interior of the balance valve core assembly (6). A valve core body (9) is fixedly provided at the lower end of the valve stem (7). A piston (10) is fixedly provided in the middle of the valve stem (7). The piston (10) is movably engaged inside the balance valve core assembly (6). A through hole (12) is provided on the inner side of the valve stem (7). A through hole (12) is provided on the surface of the valve stem (7) at the upper end of the piston (10). The through hole (12) is connected to the inside of the drainage channel (11). An upper chamber (13) is provided inside the balance valve core assembly (6) at the upper end of the piston (10).

2. The replaceable thermostatic expansion valve balance valve core according to claim 1, characterized in that: An "O"-shaped rubber ring (14) is provided in the middle of the surface of the piston (10), and a sealing gasket (15) is provided on the surface of the balance valve core assembly (6).

3. The replaceable thermostatic expansion valve balance valve core according to claim 1, characterized in that: The outside of the balance valve core assembly (6) is provided with a superheat component adjustment mechanism that adjusts the threshold of the valve stem (7) pushed down by the heat pack assembly (3). The superheat component adjustment mechanism includes an upper top plate (16), an adjustment plate (17), and a spring (18). The upper top plate (16) is fixedly provided at the upper end of the valve stem (7). The adjustment plate (17) is screwed onto the outer surface of the balance valve core assembly (6) through a thread. The spring (18) is sleeved between the adjustment plate (17) and the upper top plate (16).

4. The replaceable thermostatic expansion valve balance valve port type valve core according to claim 1, characterized in that: The upper end of the valve stem (7) is connected to the heat pack assembly (3).

5. The replaceable thermostatic expansion valve balance valve core according to claim 1, characterized in that: The drainage channel (11) has a diameter of φ3mm, and the through hole (12) has a diameter of φ0.8mm.

6. The replaceable thermostatic expansion valve balance valve port type valve core according to claim 1, characterized in that: A fixing bolt (19) is provided between the upper shell (1) and the lower shell (2).

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