A thermostatic expansion valve device for an integrated bypass valve in an oil filter module

Abstract

The application relates to a temperature-sensitive thermostat device integrated with a bypass valve for an oil filter module, which comprises a shell, a temperature-sensitive element assembly and a telescopic limiting piece, the temperature-sensitive element assembly is installed in a cavity of the shell and is limited by the telescopic limiting piece, the shell is respectively provided with an oil inlet and a filter core inlet; the temperature-sensitive element assembly comprises a piston, a temperature sensing element and a bypass valve assembly, the piston is slidably installed in the cavity of the shell, the temperature sensing element is installed at one end of the piston, the piston is limited by the temperature sensing element and the telescopic limiting piece, and the oil inlet is opened or closed; the piston is provided with a bypass through hole in the middle, and the bypass valve assembly is installed on the piston and used for closing or opening the bypass through hole in the middle of the piston. The integrated thermostat device removes a support, saves space, increases a bypass valve cross-sectional area and reduces flow resistance.

Description

Technical Field

[0001] This invention relates to the field of automotive engine cooling technology, and more specifically to a temperature-sensing thermostat device for integrating a bypass valve in an oil filter module. Background Technology

[0002] Patent CN211422724U describes a temperature-sensing integrated thermostat device for use in an oil module. It is integrated with a bracket structure to integrate the thermostat temperature-sensing element assembly and the bypass valve assembly. It can be directly installed and removed by rotating through the threads on the bracket, which improves the shortcomings of traditional temperature-sensing thermostats and optimizes the installation process. However, the device has a relatively complex structure and the bracket is expensive. The bypass valve assembly is coupled to the piston through the bypass valve seat. The space of the bypass valve plate is limited within the bypass valve seat, resulting in a small flow cross-sectional area and excessive oil resistance. Summary of the Invention

[0003] The purpose of this invention is to provide a temperature-sensing thermostat device for integrating a bypass valve in an oil filter module in order to solve the above-mentioned problems.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] A temperature-sensing thermostat device for integrating a bypass valve in an oil filter module includes a housing, a temperature-sensing element assembly, and a retractable limiting member. The temperature-sensing element assembly is installed in the cavity of the housing and is limited by the retractable limiting member installed at one end of the cavity of the housing. The housing has an oil inlet and a filter element inlet. The temperature-sensing element assembly includes a piston, a temperature sensing element, and a bypass valve assembly. The piston is slidably installed in the cavity of the housing. The temperature sensing element is installed at one end of the piston. Under the limiting action of the temperature sensing element and the retractable limiting member, the piston opens or closes the oil inlet. A bypass through hole is provided in the middle of the piston. The bypass valve assembly is installed on the piston for closing or opening the bypass through hole in the middle of the piston.

[0006] Furthermore, the piston divides the cavity inside the housing into an oil inlet chamber and an oil outlet chamber, and the retractable limiting member is located in the oil outlet chamber.

[0007] Furthermore, the temperature sensing element is screw-shaped and axially installed in the middle of the piston. The end of the temperature sensing element located in the oil inlet chamber is provided with a slender push rod, which is installed on the inner wall of one end of the oil inlet chamber.

[0008] Furthermore, the push rod is made of a high-temperature expansion material. When the temperature is too high, the temperature sensing element expands, and the piston moves under the action of the push rod.

[0009] Furthermore, the bypass valve assembly is installed at the other end of the temperature sensing element corresponding to the push rod, and includes a bypass valve plate and a bypass valve spring. The bypass valve plate is sleeved on the temperature sensing element and is limited by the bypass valve spring. The other end of the bypass valve spring is limited by a baffle plate provided at the end of the temperature sensing element, and the bypass valve spring is in a compressed state.

[0010] Furthermore, the piston is in the shape of a cover, with one end being conical and a bypass hole in the middle. Under normal operating conditions, the bypass valve plate is pressed against the piston by the bypass valve spring, thus sealing its bypass hole.

[0011] Furthermore, the baffle is riveted to the piston by means of a flange.

[0012] Furthermore, the oil inlet is located in the oil inlet chamber, and the filter element inlet is located in the oil outlet chamber.

[0013] Furthermore, the retractable limiting member is a limiting spring. The limiting spring is in a compressed state, with one end limited by the inner wall of the housing cavity and the other end limited by the temperature sensing element assembly, and has a thrust on the temperature sensing element assembly.

[0014] Furthermore, the housing is cylindrical, and its inner wall is provided with a sliding surface that guides the piston.

[0015] The specific working principle of the device of the present invention is as follows:

[0016] Under normal conditions, the piston is in the open state. That is, when the temperature of the oil entering through the oil inlet is lower than the set value, the piston does not close the oil flow port under the action of the retractable limiting component. The oil entering the housing chamber can pass through the filter element inlet into the filter element; some oil can enter the cooler. The oil flow rate into the filter element inlet and the cooler depends on the oil flow rate from the oil inlet.

[0017] When high-temperature engine oil is introduced into the oil inlet (when the oil temperature is higher than the set value), the temperature sensing element expands due to the increased temperature, pushing the piston to move. The piston closes the oil inlet. At this time, the high-temperature engine oil cannot enter the oil outlet chamber from the oil inlet chamber. That is, the high-temperature engine oil needs to enter the cooler inlet. After the engine oil is cooled to a certain temperature by the cooler, it reaches each lubrication point, ensuring the lubrication effect of the lubrication point and extending the life of the engine oil.

[0018] When high-temperature engine oil is introduced into the oil inlet chamber, the piston closes the oil flow port. At this time, the filter element inlet is in a closed state. Under certain extreme operating conditions, such as a malfunction in the cooler branch (e.g., blockage), if no engine oil enters the filter element, the engine will not have any usable oil. This situation should be avoided. The bypass valve assembly in this device plays a crucial role. If such a situation occurs, when the pressure difference between the oil inlet and the lubrication end rises to the set opening pressure, the high-pressure engine oil in the oil inlet chamber acts on the bypass valve plate. The bypass valve plate moves, the bypass orifice on the piston opens, and engine oil passes through, entering the filter element inlet. This avoids the aforementioned problem, ensuring that engine lubrication system maintains an oil flow, protecting all lubricated components during engine operation.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. Compared with the integrated thermostat device for oil module disclosed in patent CN211422724U, which adopts an integrated bracket structure, the integrated thermostat device of the present invention eliminates the bracket, saves space, increases the cross-sectional area of ​​the bypass valve, and reduces flow resistance.

[0021] 2. Compared with the bypass valve assembly of the temperature-sensing integrated thermostat device for the oil module disclosed in patent CN211422724U, which includes a bypass valve plate, a bypass valve seat, a bypass valve spring, and a temperature sensing element assembly connected together by a piston coupling, the bypass valve seat of the integrated thermostat device of the present invention is changed to a baffle plate and the lower end of the temperature sensing element is flanged and riveted together. The baffle plate structure is simpler and the cost is reduced. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the temperature sensing element assembly and the retractable limiting component of the device of the present invention;

[0023] Figure 2 This is a schematic diagram of the piston in the open state of the device of the present invention;

[0024] Figure 3 This is a schematic diagram of the piston in the closed state of the device of the present invention;

[0025] Figure 4 This is a schematic diagram of the bypass valve of the device of the present invention in the open state;

[0026] Figure 5 This is a schematic diagram illustrating the working principle. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1-4A temperature-sensing thermostat device for integrating a bypass valve in an oil filter module includes a housing 1, a temperature-sensing element assembly, and a retractable limiting member. The temperature-sensing element assembly is installed inside the cavity of the housing 1 and is limited by the retractable limiting member installed at one end of the cavity of the housing 1. The retractable limiting member is a limiting spring 4, which is in a compressed state. One end of the limiting spring 4 is limited by the inner wall of the cavity of the housing 1, and the other end is limited by the temperature-sensing element assembly, exerting a thrust on the temperature-sensing element assembly.

[0029] The temperature sensing element assembly includes a piston 2, a temperature sensing element 3, and a bypass valve assembly. The piston 2 is slidably mounted in the cavity of the housing 1. The temperature sensing element 3 is mounted on one end of the piston 2. Under the limiting action of the temperature sensing element 3 and the retractable limiting member, the piston 2 opens or closes the oil inlet 8. A bypass through hole is provided in the middle of the piston 2. The bypass valve assembly is mounted on the piston 2 and is used to close or open the bypass through hole in the middle of the piston 2. The integrated thermostat device of this invention eliminates the bracket, saves space, and increases the cross-sectional area of ​​the bypass valve to reduce flow resistance.

[0030] Specifically, the piston 2 divides the cavity inside the housing 1 into an oil inlet chamber and an oil outlet chamber. The telescopic limiting member is located in the oil outlet chamber. The housing 1 is provided with an oil inlet 8 and a filter element inlet 9, respectively. The oil inlet 8 is located in the oil inlet chamber, and the filter element inlet 9 is located in the oil outlet chamber.

[0031] The temperature sensing element 3 is screw-shaped and axially mounted in the middle of the piston 2. A slender push rod 301 is located at the end of the temperature sensing element 3 within the oil inlet chamber, and the push rod 301 is mounted on the inner wall of one end of the oil inlet chamber. When the temperature is too high, the temperature sensing element 3 expands, and the piston 2 moves under the action of the push rod 301.

[0032] The housing 1 is cylindrical, with a sliding surface on its inner wall guiding the piston 2. A bypass valve assembly is installed at the other end of the temperature sensing element 3, corresponding to the push rod 301. It includes a bypass valve plate 5 and a bypass valve spring 6. The bypass valve plate 5 is sleeved on the temperature sensing element 3 and limited by the bypass valve spring 6. The other end of the bypass valve spring 6 is limited by a baffle 7 located at the end of the temperature sensing element 3, and the bypass valve spring 6 is in a compressed state. The piston 2 is a cover-shaped structure with a tapered end and a bypass through-hole in the middle. Under normal operating conditions, the bypass valve plate 5 is pressed against the piston 2 by the bypass valve spring 6, sealing its bypass through-hole. The baffle 7 is riveted to the piston 2 by a flange. The bypass valve seat is replaced by a baffle 7 riveted to the lower end of the temperature sensing element by a flange. The baffle 7 structure is simpler and reduces costs.

[0033] The specific working principle of the device of the present invention is as follows:

[0034] like Figure 2Under normal conditions, piston 2 is in the open state. That is, when the temperature of the oil entering through the oil inlet 8 is lower than the set value, piston 2 does not close the oil flow port under the action of the retractable limiting member. The oil entering the chamber of housing 1 can enter the filter element through the filter element inlet 9. Some oil can enter the cooler. The oil flow rate into the filter element inlet 9 and the cooler depends on the oil flow rate from the oil inlet 8.

[0035] like Figure 3 When high-temperature engine oil is introduced into the oil inlet 8 (when the engine oil temperature is higher than the set value), the temperature sensing element 3 expands due to the increase in temperature. Under the action of the push rod 301, it pushes the piston 2 to move. The piston 2 closes the oil inlet 8. At this time, the high-temperature engine oil cannot enter the oil outlet chamber from the oil inlet chamber, that is, it prevents the high-temperature engine oil from entering the filter element through the filter element inlet 9, ensuring the lubrication effect of the lubrication point and extending the life of the engine oil.

[0036] like Figure 4 When high-temperature engine oil is introduced into the oil inlet chamber, piston 2 closes the oil flow port. At this time, the filter element inlet 9 is in a closed state. Under certain extreme operating conditions, such as a malfunction in the cooler branch (e.g., blockage), if no engine oil enters the filter element, the engine will not have any usable engine oil. This situation should be avoided. The bypass valve assembly in this device plays a role. That is, if such a situation occurs, when the pressure difference between the oil inlet 8 and the lubrication end rises to the set opening pressure, the high-pressure engine oil in the oil inlet chamber acts on the bypass valve plate 5, the bypass valve plate 5 moves, the bypass orifice on piston 2 opens, and the engine oil passes through and enters the filter element inlet 9. This avoids the above problem, keeps engine oil flowing in the engine lubrication system, and protects the various lubricated components of the engine during operation.

[0037] Figure 5 This diagram illustrates the working principle of this device when applied to an automotive engine module. The engine oil in the tank passes through a cooler and the device of this invention before being filtered by a filter element. After filtration, the oil is used in the engine, and the used oil returns to the tank, creating a cycle. The temperature-sensing integrated thermostat in this invention is designed to regulate both the temperature and pressure of the engine oil. This invention not only achieves simultaneous temperature and pressure regulation but also eliminates the need to separately consider the installation positions of the temperature-sensing element assembly and the bypass valve assembly. Therefore, the housing structure for mounting the temperature-sensing integrated thermostat is optimized, saving design space.

[0038] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A thermostatic expansion valve device for use in an oil filter module with an integrated bypass valve, characterized in that The temperature sensing element assembly includes a piston, a temperature sensing element and a bypass valve assembly, the piston is slidingly installed in the cavity of the shell, the temperature sensing element is installed at one end of the piston, and the piston is opened or closed under the action of the temperature sensing element and the telescopic limiting piece. The piston is provided with a bypass through hole in the middle, and the bypass valve assembly is installed on the piston for closing or opening the bypass through hole in the middle of the piston. The piston divides the cavity in the shell into an oil inlet chamber and an oil outlet chamber, and the telescopic limiting piece is located in the oil outlet chamber. The temperature sensing element is in the shape of a screw rod and is axially installed in the middle of the piston. The end of the temperature sensing element located in the oil inlet chamber is provided with an elongated top rod, and the top rod is installed on the inner wall at one end of the oil inlet chamber. The bypass valve assembly is installed at the other end of the temperature sensing element corresponding to the top rod and includes a bypass valve piece and a bypass valve spring, the bypass valve piece is sleeved on the temperature sensing element and is limited by the bypass valve spring, the other end of the bypass valve spring is limited by a baffle provided at the end of the temperature sensing element, and the bypass valve spring is in a compressed state. The piston is in the shape of a shell, one end is conical, and the middle is provided with a bypass through hole, under normal working conditions, the bypass valve piece is pressed against the piston under the action of the bypass valve spring to close the bypass through hole. The baffle is riveted with the piston by flanging. The top rod is made of high-temperature expansion material, when the temperature is too high, the temperature sensing element expands, and the piston moves under the action of the top rod.

2. A thermostatic expansion valve device for an integrated bypass valve in an oil filter module according to claim 1, characterized in that The oil inlet is provided in the oil inlet chamber, and the filter core inlet is provided in the oil outlet chamber.

3. A thermostatic expansion valve device for an integrated bypass valve in an oil filter module according to claim 1, characterized in that The telescopic limiting piece is a limiting spring, the limiting spring is in a compressed state, one end of the limiting spring is limited by the inner wall of the shell cavity, the other end of the limiting spring is limited by the temperature sensing element assembly, and the temperature sensing element assembly has a pushing force.

4. A thermostatic expansion valve device for an integrated bypass valve in an oil filter module according to claim 1, characterized in that The shell is in the shape of a cylinder, and the inner wall is provided with a sliding surface for guiding the piston.

5. A thermostatic expansion valve device for an integrated bypass valve in an oil filter module according to claim 1, wherein ​

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