Electric three-way temperature control valve

Abstract

The utility model discloses an electric three-way temperature control valve, which belongs to the technical field of valve manufacture and comprises a valve core arranged in a valve body, a positioning boss arranged on a valve cover and extending into an inner cavity of the valve body, a gland mounted on the outer side of the valve cover, and a valve rod with one end penetrating through the valve cover to be connected with the valve core and the other end connected with an electric actuator. The valve rod penetrates through the gland and the valve cover, a plurality of first sealing rings are arranged between the valve rod and the gland, a plurality of second sealing rings are arranged between the gland and the valve cover, and the unilateral gap between the valve element and the valve body is 0.25-0.3 mm. The accident that the valve cannot be opened and closed due to too large torque is effectively prevented, sealing performance is good, and disassembly is convenient. It is guaranteed that the phenomena that the leakage amount is too large, the medium temperature cannot be accurately controlled are avoided, and meanwhile it is guaranteed that the valve body and the valve element are prevented from being blocked, and friction scratching of the valve body and the valve element is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of valve manufacturing technology, and specifically relates to an electric three-way temperature control valve. Background Technology

[0002] Existing electric three-way temperature control valves often use packing seals for the valve stem. However, the packing compression cannot be precisely controlled, leading to significant torque variations. Sometimes, excessive compression can cause the packing to seize the valve stem, resulting in excessive torque and preventing the valve from opening or closing. Furthermore, the clearance control between the valve body and valve core in existing electric three-way temperature control valves is not ideal. Some clearances are too large, causing excessive leakage and preventing precise temperature control of the medium. Other clearances are too small, causing jamming during opening and closing, severe friction and scratches on the valve body and valve core, and ultimately, failure to operate normally after a period of use. Chinese Patent Publication No. CN205745455U, published on November 30, 2016, discloses a Chinese patent entitled "An Electric Three-Way Ball Valve," which includes a valve body with three... The valve body has interconnected channels. A valve seat is installed inside the valve body's valve chamber, and a valve core is rotatably installed inside the valve seat. A valve stem is installed on the upper end of the valve core. The upper end of the valve stem is driven by an electric actuator installed on the upper end of the valve body. A packing seal structure is provided between the valve stem and the valve body's mounting hole. A valve core fixing seat is provided on the lower end face of the valve body. A fixing shaft is provided on the upper end face of the fixing seat. A shaft head is provided on the upper end of the fixing shaft. The upper end of the shaft head is inserted into the rotating mounting groove on the valve core. The valve stem of this ball valve uses a packing seal structure. Precise control of the packing compression is difficult and can easily cause the valve to fail to open or close. Utility Model Content

[0003] This utility model provides an electric three-way temperature control valve. By setting a sealing structure on both the inner and outer sides of the pressure cap and fixing the compression amount, the torque difference of each valve is very small, which effectively prevents the valve from failing to open or close due to excessive torque. It has good sealing performance and is easy to disassemble.

[0004] A further objective of this invention is to determine the gap range between the valve body and the valve core through multiple experiments, ensuring that there will be no excessive leakage and no inaccurate control of the medium temperature, while also ensuring that there will be no jamming of the valve body and valve core or frictional scratches between the valve body and valve core.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an electric three-way temperature control valve, comprising a valve core disposed within a valve body, a valve cover having a positioning boss extending into the valve body cavity, a pressure cap installed on the outer side of the valve cover, one end of a valve stem passing through the valve cover and connected to the valve core, and the other end connected to an electric actuator; the valve stem passing through the pressure cap and the valve cover, a plurality of first sealing rings being disposed between the valve stem and the pressure cap, a plurality of second sealing rings being disposed between the pressure cap and the valve cover, and the single-sided gap between the valve core and the valve body being 0.2 to 0.5 mm.

[0006] Preferably, the valve cover has a mounting groove on its outer side, with openings at both ends, and a stepped portion on the inner wall of the mounting groove. The stepped portion is circumferentially arranged along the side wall of the mounting groove. This structural design makes the installation of the gland more stable and precise. The positioning effect of the stepped portion ensures that the gland will not shift during installation, thereby improving the overall assembly accuracy and reliability, and further enhancing sealing performance. At the same time, this design also facilitates subsequent disassembly and maintenance, reducing the difficulty of repair.

[0007] Preferably, the gland is positioned within the mounting groove, and the gland has a snap-fit ​​boss along its outer outer wall in a circumferential direction. The snap-fit ​​boss engages with the stepped portion. The engagement between the snap-fit ​​boss and the stepped portion ensures a secure connection between the gland and the valve cover, enhancing structural stability. This snap-fit ​​method not only avoids the loosening problems that may arise from threaded connections but also simplifies the assembly process and reduces production costs. Simultaneously, the snap-fit ​​structure effectively distributes stress, reduces localized stress concentration, and extends the valve's service life.

[0008] Preferably, a first valve stem hole is provided through the center of the gland, and several first grooves are provided on the inner wall of the valve stem hole, with a first sealing ring installed in each groove. A second valve stem hole is provided through the bottom of the mounting groove of the valve cover. The first and second valve stem holes are correspondingly positioned and have the same diameter. The valve stem passes through both the first and second valve stem holes and connects to the valve core. By providing grooves on the inner wall of the valve stem hole and installing sealing rings, the sealing performance between the valve stem and the gland is further enhanced. The multiple sealing rings effectively prevent media leakage and improve the reliability of the valve. At the same time, the precise alignment and identical diameter design of the first and second valve stem holes ensure smooth movement of the valve stem, reduce friction, reduce torque loss, and improve the service life and operating performance of the valve.

[0009] Preferably, the gland has several second grooves inside the snap-fit ​​boss, and a second sealing ring is installed in each of the second grooves. The second sealing ring between the gland and the valve cover further enhances the sealing performance, forming a multi-layered sealing structure. This design effectively prevents media leakage from the gap between the gland and the valve cover, while also preventing external impurities from entering the valve, protecting internal parts from contamination, and improving the valve's reliability and service life.

[0010] Preferably, a first gasket is installed on the inner side of the valve stem and located on the outer side of the valve core. This provides excellent sealing performance, precise valve torque control, convenient maintenance, and low maintenance costs. The first gasket reduces the end-face friction between the valve stem and the valve cover, lowering the valve's torque requirement and thus achieving more precise torque control. Simultaneously, the gasket acts as a buffer, reducing hard impacts between the valve stem and the valve cover, protecting component surfaces, and extending service life. Furthermore, this design makes gasket replacement easier during maintenance, reducing maintenance costs.

[0011] Preferably, the valve core has an inner end with a mounting rod, and the valve seat has an inner wall with a rod groove, within which the mounting rod is positioned. The rod groove extends out of the inner wall of the valve seat. This structural design makes the valve core installation more stable. The cooperation between the mounting rod and the rod groove effectively prevents the valve core from shifting or shaking during operation, thereby improving the control accuracy and reliability of the valve. Simultaneously, the rod groove design also provides guidance for the movement of the valve core, ensuring smooth rotation and reducing operating noise.

[0012] Preferably, a lubricated bearing is provided between the mounting rod and the rod groove. This reduces the friction of the valve stem and lowers the valve torque. The lubricated bearing significantly reduces the friction between the valve stem and the rod groove, further reducing the valve's torque requirements. This design not only improves the valve's operating performance but also reduces heat and wear caused by friction, extending the valve's service life, while simultaneously reducing energy consumption and improving work efficiency.

[0013] Preferably, a second gasket is provided between the outer side of the stem groove and the valve core. Both the first and second gaskets are designed to reduce the end-face friction of the valve stem and lower the valve torque. The electric actuator drives the valve stem to rotate, which in turn drives the valve core to rotate. The rotation of the valve core controls the flow area of ​​the three evenly distributed holes on the valve body, thereby controlling the valve. The control modes are divided into two main categories: flow splitting and flow merging. Each of these categories has three control modes, allowing a single valve to achieve multiple control modes, making it a multi-purpose valve. The second gasket further reduces the end-face friction between the valve core and the stem groove. Working together with the first gasket, it further reduces the valve's torque requirement, improving operational flexibility and reliability. Simultaneously, this design enables the valve to achieve multiple control modes, greatly improving its versatility and economy, and reducing the cost for users to replace valves in different application scenarios.

[0014] Preferably, a sealing gasket is provided at the engagement point between the valve cover positioning boss and the valve body. The positioning boss embedded in the inner cavity serves two purposes: first, it positions the valve body and valve cover to ensure concentricity; second, it creates a sealed groove at the engagement point, effectively preventing the sealing gasket from overflowing from the valve body and valve cover connection, thus ensuring the sealing performance of the cavity. The sealing gasket effectively prevents media leakage from the valve body and valve cover connection, further enhancing sealing performance. The positioning function of the positioning boss ensures the concentricity of the valve body and valve cover, improving assembly accuracy and the overall performance of the valve. Simultaneously, the sealing groove design prevents the sealing gasket from overflowing during assembly, ensuring correct installation and sealing effect, extending the gasket's service life, and reducing maintenance frequency. The preferred single-sided gap between the valve core and valve body is 0.25–0.3 mm.

[0015] The beneficial effects of this utility model are as follows: This utility model provides an electric three-way temperature control valve. By setting a sealing structure on both the inner and outer sides of the pressure cap and fixing the compression amount, the torque difference of each valve is very small, effectively preventing accidents caused by excessive torque preventing the valve from opening or closing. It has good sealing performance and is easy to disassemble. Through multiple experiments, the gap range between the valve body and the valve core has been determined, ensuring that there will be no excessive leakage and no inaccurate control of the medium temperature, while also ensuring that there will be no jamming of the valve body and valve core or friction scratches between the valve body and valve core. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of one structure of the present utility model.

[0017] Figure 2 This is a schematic diagram of one structure of the present utility model.

[0018] Figure 3 for Figure 2 Enlarged view of point A.

[0019] Reference numerals in the attached drawings: 1: Valve body, 2: Valve core, 3: Valve cover, 4: Sealing gasket, 5: Stud, 6: Nut, 7: Valve stem, 8: Electric actuator, 9: Bolt, 10: Rod groove, 11: Gland, 12: First sealing ring, 13: Second sealing ring, 14: First gasket, 15: Second gasket, 16: Mounting rod, 17: Lubricating bearing, 18: Positioning boss, 19: First groove, 20: Second groove, 21: Step, 22: Snap-fit ​​boss. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] Precise temperature control is crucial in modern industrial production and daily life. Electric three-way thermostatic valves, as key devices for achieving precise temperature regulation, are widely used in HVAC, chemical, food processing, and many other fields. However, traditional three-way thermostatic valves suffer from numerous problems in practical use, such as poor sealing performance leading to media leakage, unstable torque causing switching malfunctions, and issues with the fit between valve body 1 and valve core 2 affecting temperature control accuracy. This utility model of an electric three-way thermostatic valve addresses these challenges through innovative structural design and rigorous process control.

[0022] Traditional temperature control valves often experience sealing problems after prolonged operation, leading to refrigerant leakage. This not only affects temperature control performance but also increases energy consumption and maintenance costs. Furthermore, due to unstable torque, the valve is prone to jamming or even failing to open or close properly during operation, severely impacting the normal operation of the system. The electric three-way temperature control valve of this invention provides an effective solution to these problems. In chemical production, precise control of reaction temperature is directly related to product quality and production safety. Traditional temperature control valves struggle to meet the high requirements for temperature control accuracy.

[0023] like Figure 1 As shown, this electric three-way temperature control valve mainly consists of a valve body 1, a valve core 2, a valve cover 3, a pressure cap 11, a valve stem, and an electric actuator. The valve core 2 is housed inside the valve body 1. The valve cover 3 is recessed into the inner cavity of the valve body 1 via a positioning boss 18, ensuring concentricity between the valve body 1 and the valve cover 3 and improving assembly accuracy. A pressure cap 11 is installed on the outer side of the valve cover 3. One end of the valve stem passes through the valve cover 3 and connects to the valve core 2, while the other end connects to the electric actuator. Driven by the electric actuator, the valve stem rotates the valve core 2, thereby controlling the flow area of ​​the three evenly distributed holes on the valve body 1, thus achieving precise valve control. The end of the valve stem is fixed to the electric actuator by bolts 9.

[0024] like Figure 2 As shown, the valve cover 3 has a mounting groove on its outer side, with openings at both ends. The inner wall of the groove has a stepped portion 21, which is circumferentially arranged along the side wall of the mounting groove. The gland 11 is installed in the mounting groove, and its outer wall has a snap-fit ​​boss 22 circumferentially arranged, which snaps onto the stepped portion 21. This structural design ensures stable and precise installation of the gland 11. In actual assembly, workers only need to align the snap-fit ​​boss 22 of the gland 11 with the stepped portion 21 of the valve cover 3 mounting groove and press gently to complete the installation, greatly simplifying the assembly process. This snap-fit ​​structure shortens the assembly time for each valve and improves production efficiency. Simultaneously, the snap-fit ​​structure avoids the loosening problems that may occur with threaded connections, greatly improving the stability of the valve during long-term use. The valve cover 3 is fixed to the valve body 1 by studs 5 and nuts 6.

[0025] like Figure 2 and Figure 3As shown, the pressure cap 11 of this utility model has a first valve stem hole penetrating through its center. Several first grooves 19 are evenly distributed on the inner wall of this valve stem hole, and a first sealing ring 12 is embedded in each first groove 19. In this embodiment, two first grooves 19 and two first sealing rings 12 are preferably provided. This double-sealing structure design can significantly improve the sealing performance of the valve. Simultaneously, the valve cover 3 has a second valve stem hole penetrating through its mounting groove at the bottom. The positions of the first valve stem hole and the second valve stem hole correspond to each other, and their diameters are exactly the same, ensuring that the valve stem can smoothly pass through the first valve stem hole and the second valve stem hole and achieve a stable connection with the valve core 2. In practical applications, the arrangement of multiple first sealing rings 12 forms multiple sealing defenses. This design not only effectively prevents the medium from leaking along the gap between the valve stem and the pressure cap 11, but also significantly reduces the probability of medium leakage, thereby ensuring the safety and hygiene of the production process, and is especially suitable for industrial applications with high sealing performance requirements.

[0026] Furthermore, the precise alignment and identical diameter of the first and second valve stem holes ensure smooth and unobstructed valve stem movement, significantly reducing friction between the valve stem and the hole wall. Compared to traditional single-seal ring designs, this multi-seal structure not only improves the sealing effect but also reduces torque loss during valve stem movement, thereby enhancing valve operation and service life. Simultaneously, this design reduces energy loss due to friction, further improving valve energy efficiency and ensuring greater stability and reliability during long-term operation.

[0027] like Figure 3 As shown, the gland 11 has several second grooves 20 inside the snap-fit ​​boss 22, and a second sealing ring 13 is provided in each second groove 20. In this embodiment, two second grooves 20 and two second sealing rings 13 are preferably provided. In the temperature control of a reactor in a chemical plant, the medium is corrosive, and the sealing performance requirements of the valve are extremely stringent. The second sealing rings 13 further enhance the sealing performance between the gland 11 and the valve cover 3, forming a reliable multi-seal structure. Actual operation verification shows that even in harsh working environments, the sealing performance of this electric three-way temperature control valve remains excellent, effectively preventing media leakage and protecting the safety of equipment and the production environment. At the same time, this sealing structure also prevents external impurities from entering the valve, reducing the risk of damage to internal parts due to impurity corrosion and extending the valve's service life.

[0028] like Figure 2As shown, the valve core 2 of this invention has an mounting rod 16 on its inner end, while the inner wall of the valve body 1 has a corresponding rod groove 10. The mounting rod 16 is precisely embedded in the rod groove 10, which extends to the inner wall of the valve seat, forming a stable and reliable connection structure. In actual installation, the precise fit between the mounting rod 16 and the rod groove 10 not only ensures that the valve core 2 can be firmly installed in the valve body 1, but also effectively prevents the valve core 2 from shifting or shaking due to vibration or pressure changes during valve operation, thereby significantly improving the overall stability and operational reliability of the valve.

[0029] Furthermore, the design of the rod groove 10 not only provides space for the mounting rod 16 but also serves a guiding function. This guiding effect allows the valve core 2 to move along a predetermined trajectory during rotation, avoiding jamming or increased friction caused by inaccurate movement. This design makes the rotation of the valve core 2 smoother, reducing mechanical resistance during operation and significantly lowering the noise generated during valve operation, creating a quieter and more comfortable operating environment for users. At the same time, this guiding structure also extends the valve's service life, reduces the frequency of maintenance and replacement due to frictional wear, and further improves the valve's economy and practicality.

[0030] A lubricating bearing 17 is provided between the mounting rod 16 and the inside of the rod groove 10, and a second gasket 15 is provided between the outer side of the rod groove 10 and the valve core 2. The lubricating bearing 17 significantly reduces the friction between the valve stem and the rod groove 10. Tests have shown that using the lubricating bearing 17 reduces the valve's torque requirement by approximately 40%, improving the valve's operating performance. Simultaneously, it reduces heat and wear caused by friction, extending the valve's service life. Using this electric three-way temperature control valve significantly reduces the equipment's failure rate, extends the maintenance cycle, and lowers maintenance costs. The second gasket 15 further reduces the end-face friction between the valve core 2 and the rod groove 10, working together with the first gasket 14 to further optimize the valve's torque control. In actual operation, the valve's torque is more stable, and operation is more flexible and reliable.

[0031] like Figure 2As shown, a first gasket 14 is installed on the inner side of the valve stem 3, and the first gasket 14 is located on the outer side of the valve core 2. During frequent valve opening and closing, the valve stem and valve cover 3 are prone to hard collisions, leading to damage to the surface of the parts. The first gasket 14 provides a good buffering effect, protecting the surfaces of the valve stem and valve cover 3. In applications with strict temperature control requirements and frequent valve opening and closing, the use of this electric three-way temperature control valve ensures that the surfaces of the valve stem and valve cover 3 remain in good condition even after prolonged use, reducing the frequency of maintenance and parts replacement, and lowering maintenance costs. Simultaneously, the first gasket 14 also reduces the end-face friction between the valve stem and valve cover 3, lowering the valve's torque requirements and achieving more precise torque control.

[0032] A sealing gasket 4 is provided at the engagement point between the valve cover 3's positioning boss 18 and the valve body 1. The positioning boss 18 serves a dual purpose: firstly, it ensures the concentricity of the valve body 1 and valve cover 3, improving assembly accuracy; secondly, it forms a sealed groove at the engagement point of the valve body 1 and valve cover 3, effectively preventing the sealing gasket 4 from overflowing from the connection. In the production process of a certain pharmaceutical company, temperature control and sealing performance requirements are extremely high. The design of the sealing gasket 4 and positioning boss 18 in this electric three-way temperature control valve ensures reliable valve sealing performance under stringent production environments, effectively preventing media leakage and guaranteeing the quality and safety of drug production. Simultaneously, the sealing groove design extends the service life of the sealing gasket 4, reduces maintenance frequency, and improves production efficiency.

[0033] This invention employs a double-sealing structure at the gland 11, specifically including a first sealing ring 12 and a second sealing ring 13. This innovative sealing structure significantly improves the overall sealing performance of the valve. The first sealing ring 12 primarily ensures an effective seal between the valve stem and the gland 11, preventing media leakage during valve stem movement. The second sealing ring 13 ensures a reliable seal between the gland 11 and the valve cover 3, preventing media leakage from the joint between them. This double-sealing structure is not only ingeniously designed but also boasts advantages such as simple structure, high practicality, and convenient maintenance, effectively improving the valve's service life and reliability.

[0034] Furthermore, this valve also possesses significant technical advantages in controlling the gap between valve body 1 and valve core 2. By precisely controlling the gap between valve body 1 and valve core 2, this valve can minimize friction and jamming while ensuring good sealing performance. Specifically, the gap design must adhere to the following principles: the gap cannot be too small, otherwise it will lead to excessive friction between valve body 1 and valve core 2, resulting in jamming and affecting the normal operation of the valve; at the same time, the gap cannot be too large, otherwise it will lead to increased media leakage, failing to meet sealing requirements, and reducing the valve's temperature control accuracy. After multiple simulation experiments and actual tests, it was finally determined that the single-sided gap between valve body 1 and valve core 2 should be controlled between 0.25-0.3mm. This gap range perfectly balances the relationship between friction and sealing performance, avoiding jamming caused by an excessively small gap, and effectively preventing leakage and decreased control accuracy caused by an excessively large gap.

[0035] This utility model's electric three-way temperature control valve successfully solves many problems existing in traditional temperature control valves through innovative sealing structure design, optimized valve core 2 and valve body 1 matching, and other key design features. In practical applications, it demonstrates advantages such as excellent sealing performance, stable torque control, precise temperature regulation, and long service life.

[0036] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this utility model.

Claims

1. An electrically operated three-way temperature control valve, characterized in that, The valve body is provided with a valve core, the valve cover is provided with a positioning boss which extends into the inner cavity of the valve body, the outer side of the valve cover is provided with a gland, one end of the valve rod penetrates through the valve cover and is connected with the valve core, and the other end is connected with an electric actuator; The valve rod penetrates through the gland and the valve cover, a plurality of first sealing rings are arranged between the valve rod and the gland, a plurality of second sealing rings are arranged between the gland and the valve cover, and the single-side gap between the valve core and the valve body is 0.2-0.5 mm.

2. The electrically powered thermostatic mixing valve according to claim 1, wherein The outer side of the valve cover is provided with a mounting groove, the mounting groove is open at both ends, and the inner wall of the mounting groove is provided with a stepped portion.

3. The electrically powered thermostatic mixing valve according to claim 2, wherein The gland is arranged in the mounting groove, the gland is provided with a clamping boss along the outer side wall in the circumferential direction, and the clamping boss is clamped on the stepped portion.

4. The electrically powered thermostatic mixing valve according to claim 1 or 3, characterized in that The center of the gland is provided with a first valve rod hole, the inner wall of the valve rod hole is provided with a plurality of first grooves, and the first grooves are provided with first sealing rings.

5. The electrically powered thermostatic mixing valve according to claim 2, wherein The gland is provided with a plurality of second grooves on the inner side of the clamping boss, and the second grooves are provided with second sealing rings.

6. The electrically powered thermostatic mixing valve according to claim 1, wherein The valve rod is provided with a first gasket at the inner side surface of the valve cover, and the first gasket is arranged at the outer side of the valve core.

7. The electrically powered thermostatic mixing valve according to claim 1 or 6, characterized in that The inner side end of the valve core is provided with a mounting rod, the inner side wall of the valve body is provided with a rod groove, and the mounting rod is arranged in the rod groove.

8. The electrically powered thermostatic mixing valve according to claim 7, wherein A lubricating bearing is arranged between the mounting rod and the inner part of the rod groove.

9. The electrically powered thermostatic mixing valve according to claim 8, wherein A second gasket is arranged between the outer side surface of the rod groove and the valve core, and the single-side gap between the valve core and the valve body is 0.25-0.3 mm.

10. The electrically powered thermostatic mixing valve according to claim 1, wherein A sealing gasket is arranged at the clamping position of the positioning boss of the valve cover and the valve body.

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