Valve core of electronic thermostat and electronic thermostat thereof

Abstract

The present invention discloses a valve core of an electronic thermostat and an electronic thermostat thereof. The valve core comprises a metal body and a plastic shell, the metal body comprises an outer cylinder part and a valve stem part, the outer cylinder part has a central hole penetrating in the axial direction, a part of the valve stem part extends into the central hole and is connected to the outer cylinder part; the plastic shell covers the side of the outer cylinder part, and the metal body is combined with the plastic shell by insert injection molding; the outer cylinder part comprises an upper body part and a lower body part, the bottom end of the upper body part is connected to the top end of the lower body part, and the side surfaces of the upper body part and the lower body part are spherical surfaces; two first fluid openings and two second fluid openings are respectively opened on the side of the plastic shell, one of the first fluid openings and one of the second fluid openings penetrates the side wall of the upper body part, and the other first fluid opening and the other second fluid opening penetrate the side wall of the lower body part. The valve core of the present invention has good surface quality, high dimensional accuracy, and is easy to manufacture.

Description

Technical Field

[0001] The present invention relates to valve technology. Background Art

[0002] The electronic thermostat is a valve used to control the flow path of the coolant in the automobile cooling system. It automatically adjusts the amount of water entering the radiator according to the temperature of the cooling water, changes the water circulation range, and adjusts the heat dissipation capacity of the cooling system to ensure that the engine works within the appropriate temperature range. The electronic thermostat must be kept in good working condition, otherwise it will seriously affect the normal operation of the engine.

[0003] The electronic thermostat includes valve body, control transmission mechanism, motor, valve core position sensor, valve core and other parts. The valve core is usually manufactured by one-piece injection molding or one-piece die-casting. The side wall thickness of the valve core manufactured in this way varies greatly, and shrinkage marks are easily formed on the surface of the valve core, making it difficult to ensure the accuracy of the valve core sealing requirements, increasing the difficulty of product production and mold manufacturing. If the valve core accuracy cannot meet the sealing requirements, it will cause internal leakage, reduce the life of the sealing component, and thus reduce the heat dissipation capacity of the cooling system. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a valve core of an electronic thermostat, which has good surface quality, high dimensional accuracy and is easy to manufacture.

[0005] Another technical problem to be solved by the present invention is to provide an electronic thermostat.

[0006] The valve core of the electronic thermostat of the embodiment of the present invention is provided with two first fluid openings and two second fluid openings, the two first fluid openings are arranged in a row along the axial direction of the valve core, and the two second fluid openings are arranged in a row along the axial direction of the valve core; the valve core comprises a metal body and a plastic shell, the metal body comprises an outer cylinder part and a valve stem part, the outer cylinder part has a central hole penetrating along the axial direction, a part of the valve stem part extends into the central hole and is connected to the outer cylinder part; the plastic shell covers the side of the outer cylinder part, and the metal body is combined with the plastic shell by insert injection molding; the outer cylinder part comprises an upper body part and a lower body part, the bottom end of the upper body part is connected to the top end of the lower body part, and the side surfaces of the upper body part and the lower body part are spherical; the two first fluid openings and the two second fluid openings are respectively opened on the side of the plastic shell, one of the first fluid openings and one of the second fluid openings penetrates the side wall of the upper body part, and the other first fluid opening and the other second fluid opening penetrate the side wall of the lower body part.

[0007] The electronic thermostat of the embodiment of the present invention includes the aforementioned valve core, valve body, motor, control transmission mechanism and transmission shaft; the valve core is rotatably arranged on the valve body, and the motor is connected to the top of the transmission shaft through the control transmission mechanism to drive the transmission shaft to rotate; the bottom of the transmission shaft is inserted into the transmission shaft mounting hole of the valve core and is connected to the valve core to drive the valve core to rotate synchronously.

[0008] The present invention has at least the following advantages:

[0009] 1. The valve core of the embodiment of the present invention is composed of a metal body and a plastic shell. The valve core is injection molded by using the pre-die-cast metal body as an insert, which reduces the manufacturing difficulty of the valve core, makes the wall thickness of the plastic shell outside the valve core uniform, improves the surface quality and dimensional accuracy of the valve core, and thus improves the sealing performance of the large and small cycles of the electronic thermostat, improves the heat dissipation capacity of the cooling system, and reduces the fuel consumption of the engine;

[0010] 2. The electronic thermostat valve core of the embodiment of the present invention has good surface quality and high dimensional accuracy, thus reducing the wear of the valve core and the sealing ring and extending the service life of the sealing ring;

[0011] 3. The valve core of the embodiment of the present invention has a lower production difficulty, thus reducing the defective rate of product manufacturing, thereby saving manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A cross-sectional schematic diagram of a valve core of an electronic thermostat according to an embodiment of the present invention is shown.

[0013] Figure 2 A schematic diagram of the appearance of a valve core metal body of an electronic thermostat according to an embodiment of the present invention is shown.

[0014] Figure 3 A schematic diagram of assembling a valve core, a transmission shaft and a sealing assembly according to an embodiment of the present invention is shown.

[0015] Figure 4 An exploded schematic diagram of an electronic thermostat according to an embodiment of the present invention is shown.

[0016] Figure 5 The figure shows an assembly diagram of a valve body base, a small circulation joint and a large circulation joint according to an embodiment of the present invention. DETAILED DESCRIPTION

[0017] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] See also Figure 1 and Figure 2 The valve core 1 of the electronic thermostat according to an embodiment of the present invention comprises a metal body 1a and a plastic shell 1b.

[0019] The metal body 1a is made by die casting or other processes. Optionally, the material of the metal body 1a is aluminum alloy. The metal body 1a includes an outer cylinder part 11 and a valve stem part 12. The outer cylinder part 11 has a central hole 110 that runs through the axial direction. A part of the valve stem part 12 extends into the central hole 110 and is connected to the outer cylinder part 11. In this embodiment, the top end of the valve stem part 12 is provided with a transmission shaft mounting hole 120 extending in the axial direction, and the bottom end of the valve stem part 12 extends out of the outer cylinder part 11. The side of the valve stem part 12 is connected to the inner side of the outer cylinder part 11 through multiple layers of connecting ribs 15 arranged along the axial direction of the valve stem part, and each layer of connecting ribs includes three connecting ribs 15. The top and bottom ends of the central hole 110 serve as liquid inlets.

[0020] The plastic shell 1b covers the side of the outer cylinder 11, and the metal body 1a is combined with the plastic shell 1b by insert injection molding. The metal body 1a is placed in the injection mold as an insert to form a complete valve core formed by the plastic shell 1b, which can improve the surface quality and dimensional accuracy of the valve core, reduce the roughness of the valve core surface, and thus reduce the sealing difficulty between the sealing component and the valve core, increase the service life of the valve core sealing component of the electronic thermostat, improve the sealing performance of the electronic thermostat in large and small cycles, reduce the production difficulty of the valve core, reduce the product defect rate, and save the manufacturing cost of the valve core.

[0021] Furthermore, the outer side surface of the outer cylinder 11 is provided with different forms of concave-convex structures 11c, which are used to increase the contact area between the metal body 1a and the plastic shell 1b, increase the bonding strength, and avoid the metal body 1a and the plastic shell 1b from peeling off due to the use environment or other factors. The concave-convex structure 11c can be a groove, a convexity, or a combination of the above two.

[0022] The outer cylinder portion 11 includes an upper body portion 111, a lower body portion 112 and an annular connecting portion 113 located between the upper body portion 111 and the lower body portion 112. The top end of the annular connecting portion 113 is connected to the bottom end of the upper body portion 111, and the bottom end of the annular connecting portion 113 is connected to the top end of the lower body portion 112. The side surfaces of the upper body portion 111 and the lower body portion 112 are spherical surfaces.

[0023] The valve core 1 is provided with two first fluid openings 13 and two second fluid openings 14, the two first fluid openings 13 are arranged in a row along the axial direction of the valve core 1, and the two second fluid openings 14 are arranged in a row along the axial direction of the valve core. The two first fluid openings 13 and the two second fluid openings 14 are respectively opened on the side of the plastic shell 1b, one of the first fluid openings 13 and one of the second fluid openings 14 penetrate the side wall of the upper body part 111 and are connected to the center hole 110, and the other first fluid opening 13 and the other second fluid opening 14 penetrate the side wall of the lower body part 112 and are connected to the center hole 110. The two first fluid openings 13 and the two second fluid openings 14 serve as liquid outlets.

[0024] Furthermore, the side of the outer cylinder 11 is provided with a first plane portion 115 and a second plane portion 116 for injection positioning, and the first plane portion 115 and the second plane portion 116 both extend along the axial direction of the outer cylinder 11, the first plane portion 115 is located between the two first fluid openings 13, and the top and bottom ends of the first plane portion 115 are respectively adjacent to the edges of the two first fluid openings 13, and the second plane portion 116 is located between the two second fluid openings 14, and the top and bottom ends of the second plane portion 116 are respectively adjacent to the edges of the two second fluid openings 14. The first plane portion 115 and the second plane portion 116 can prevent the valve core from rotating during the injection molding process, thereby improving the position accuracy of the fluid openings.

[0025] Please combine Figure 3 and Figure 4 As shown. The two first fluid openings 13 correspond to the small circulation joints 23 of the electronic thermostat, and the two second fluid openings 14 correspond to the large circulation joints 24 of the electronic thermostat. A sealing assembly 3 is provided between each first fluid opening 13 and the small circulation joint 23, and between each second fluid opening 14 and the large circulation joint 24. Furthermore, the mouth of each fluid opening (i.e., each fluid opening 13 and each second fluid opening 14) is designed with a smooth R angle, which can reduce the contact between the valve core and the sealing assembly 3 (see Figure 3 ) friction, thereby extending the service life of the sealing component 3.

[0026] Figure 4 and Figure 5 The structure of the electronic thermostat according to the embodiment of the present invention is shown. Figure 4 and Figure 5 The electronic thermostat according to the embodiment of the present invention includes a valve core 1, a valve body 2, four sealing components 3, a motor 4, a transmission shaft 5 and a control transmission mechanism.

[0027] The valve core 1 is rotatably arranged on the valve body 2. The bottom of the transmission shaft 5 is inserted into the transmission shaft mounting hole 120 of the valve core 1 and connected to the valve core 1 to drive the valve core 1 to rotate synchronously. The connection method includes but is not limited to interference fit, threaded connection, etc. The top end of the transmission shaft 5 is sleeved with a first sliding bearing 71, and the bottom end of the valve stem 12 is sleeved with a second sliding bearing 72. The first sliding bearing 71 and the second sliding bearing 72 are respectively installed on the valve body 2. The provision of sliding bearings can reduce the friction and shaking of the valve core 1 and the transmission shaft 5 during movement, reduce the resistance caused by the friction between the valve core and the transmission shaft, and thus extend the service life of the sealing component 3.

[0028] The valve body 2 includes a valve body 21, a small circulation joint 23 and a large circulation joint 24. The small circulation joint 23 and the large circulation joint 24 are respectively connected to the side of the valve body 21. In this embodiment, the valve body 21 is composed of a cover plate 211, a fixing bracket 212 and a valve body base 213 connected in sequence, and the small circulation joint 23 and the large circulation joint 24 are respectively connected to the side of the valve body base 213.

[0029] The motor 4 is connected to the top of the transmission shaft 5 through the control transmission mechanism to drive the transmission shaft 5 to rotate. In this embodiment, the control transmission mechanism includes a valve core position sensor 61, an intermediate gear 62, and a transition gear 63. The motor 4 drives the transmission shaft 5 and the valve core 1 to rotate through the transition gear 63 and the intermediate gear 62. The valve core position sensor 61 monitors the movement angle of the valve core 1 in real time, which can quickly and accurately control the flow of the large and small cycles, reduce the response time of the electronic thermostat, and thus improve the heat dissipation capacity of the cooling system and reduce the fuel consumption of the engine. The electronic thermostat uses gear transmission to control the opening and closing of the large and small cycles, which is more stable for the movement control of the valve core and realizes precise control of the flow of the large and small cycles.

[0030] The above description is a further explanation of the present invention in combination with specific implementation methods and drawings. However, the present invention can obviously be implemented in a variety of other methods different from the description, and those skilled in the art can generalize and deduce according to actual usage without violating the content of the present invention. Therefore, the content of the above specific embodiments should not limit the protection scope determined by the present invention.

Claims

1. A valve core of an electronic thermostat, wherein the valve core is provided with two first fluid openings and two second fluid openings, the two first fluid openings are arranged in a row along the axial direction of the valve core, and the two second fluid openings are arranged in a row along the axial direction of the valve core; characterized in that: The valve core comprises a metal body and a plastic shell, the metal body comprises an outer cylinder part and a valve stem part, the outer cylinder part has a central hole extending through the axial direction, a part of the valve stem part extends into the central hole and is connected to the outer cylinder part; the plastic shell covers the side surface of the outer cylinder part, and the metal body is combined with the plastic shell by insert injection molding; The outer cylinder body comprises an upper body part and a lower body part, the bottom end of the upper body part is connected to the top end of the lower body part, and the side surfaces of the upper body part and the lower body part are spherical surfaces; The two first fluid openings and the two second fluid openings are respectively opened on the side of the plastic shell, wherein one of the first fluid openings and one of the second fluid openings penetrates the side wall of the upper body portion, and the other first fluid opening and the other second fluid opening penetrates the side wall of the lower body portion.

2. The valve core of the electronic thermostat according to claim 1, characterized in that: The outer side surface of the outer cylinder is provided with a concave-convex structure.

3. The valve core of the electronic thermostat according to claim 1, characterized in that: The outer cylinder portion includes an annular connecting portion, which is located between the upper body portion and the lower body portion, wherein the top end of the annular connecting portion is connected to the bottom end of the upper body portion, and the bottom end of the annular connecting portion is connected to the top end of the lower body portion.

4. The valve core of the electronic thermostat according to claim 1 or 3, characterized in that: The side surface of the outer cylinder portion is provided with a first planar portion and a second planar portion for injection molding positioning, the first planar portion and the second planar portion both extend along the axial direction of the outer cylinder portion, the first planar portion is located between the two first fluid openings, and the top and bottom ends of the first planar portion are respectively adjacent to the edges of the two first fluid openings, and the second planar portion is located between the two second fluid openings, and the top and bottom ends of the second planar portion are respectively adjacent to the edges of the two second fluid openings.

5. The valve core of the electronic thermostat according to claim 1, characterized in that: The side surface of the valve stem portion is connected to the inner side surface of the outer cylinder portion through multiple layers of connecting ribs arranged along the axial direction of the valve stem portion.

6. The valve core of the electronic thermostat according to claim 1 or 5, characterized in that: A transmission shaft mounting hole extending in the axial direction is provided at the top end of the valve stem portion, and the bottom end of the valve stem portion extends out of the outer cylinder portion.

7. The valve core of the electronic thermostat according to claim 1, characterized in that: The mouth of each fluid opening is provided with an R angle.

8. The valve core of the electronic thermostat according to claim 1, characterized in that: The metal body is formed by die casting.

9. An electronic thermostat, comprising a valve body, a valve core, a motor, a control transmission mechanism and a transmission shaft; the valve core is rotatably arranged on the valve body, and the motor is connected to the top of the transmission shaft through the control transmission mechanism to drive the transmission shaft to rotate; characterized in that: The valve core is the valve core as claimed in claim 6; The bottom of the transmission shaft is inserted into the transmission shaft mounting hole of the valve core and connected with the valve core to drive the valve core to rotate synchronously.

10. The electronic thermostat according to claim 9, characterized in that: The top end of the transmission shaft is sleeved with a first sliding bearing, the bottom end of the valve stem is sleeved with a second sliding bearing, and the first sliding bearing and the second sliding bearing are respectively mounted on the valve body.

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