Valve element, pressure valve and lubricating oil cooling system

Abstract

The utility model discloses a valve element, a pressure valve and a lubricating oil cooling system, and relates to the technical field of wind power gear box lubricating and cooling. The valve element comprises a guide rod, a cylindrical valve element seat in sealing fit with the guide rod is connected to the guide rod in a sliding mode, a first sealing face is formed on the peripheral face of the valve element seat, and the two ends of the guide rod are connected with a baffle and a limiting block respectively. A first spring arranged on the guide rod in a sleeving mode and a second spring arranged on the first spring in a sleeving mode are connected between the baffle and the valve element base in an abutting mode. A first opening is formed in the end, facing the limiting block, of the valve element base, and a second opening communicating with the first opening is formed in the first sealing face. According to the pressure valve, a double-spring structure composed of the first spring and the second spring is adopted, the opening pressure difference interval of the pressure valve is effectively expanded, the threshold value of the pressure valve is increased, the oil way control performance of the pressure valve is enhanced, the pressure valve can adapt to more complex working conditions, and safe operation of a wind power gear box in various environments can be guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of lubrication and cooling for wind power gearboxes, and particularly to a valve core, a pressure valve, and a lubricating oil cooling system. Background Art

[0002] In the lubrication and cooling system of a wind power gearbox, as an oil circuit control component, the pressure valve is used to control the flow direction of the lubricating oil in the lubrication and cooling system of the wind power gearbox to ensure the efficient operation of the wind power gearbox.

[0003] However, most of the pressure valves in the prior art adopt the design concept of a temperature bulb type control valve, whose main concern is the opening and closing temperature of the valve, while ignoring the unique differential pressure driving mechanism of the pressure valve, which results in generally low threshold values of the existing pressure valves.

[0004] Although the existing pressure valves perform well in normal temperature and high temperature environments, they are prone to pressure deficiency problems in low temperature environments, which causes high temperature oil to enter the wind power gearbox through the low temperature oil circuit, leading to overheating of the bearings and affecting the normal operation and safety of the wind power system. Summary of the Utility Model

[0005] The purpose of the present application is to provide a valve core, a pressure valve, and a lubricating oil cooling system to solve the problem of the low threshold value of the existing pressure valve.

[0006] The technical solution adopted by the present application to solve its technical problems is as follows:

[0007] In the first aspect, a valve core is provided, including a guide rod, on which a cylindrical valve core seat that is in sealed cooperation with it is slidably connected. The outer peripheral surface of the valve core seat forms a first sealing surface, and both ends of the guide rod are respectively connected with a baffle plate and a limiting block; a first spring sleeved on the guide rod and a second spring sleeved on the first spring are abutted between the baffle plate and the valve core seat; one end of the valve core seat facing the limiting block is provided with a first opening, and a second opening communicating with the first opening is provided on the first sealing surface.

[0008] Further, one end of the valve core seat facing the baffle plate is provided with a second installation cavity, and the bottom of the second installation cavity is provided with a first installation cavity. One end of the first spring abuts against the bottom of the first installation cavity, and one end of the second spring abuts against the bottom of the second installation cavity.

[0009] Further, an oil hole communicating with the second installation cavity is provided on the first sealing surface; in the axial direction of the guide rod, the second opening is located between the first opening and the oil hole.

[0010] Further, the limiting block is threadedly connected to the guide rod.

[0011] Further, the valve core seat includes an inner sleeve sleeved on the guide rod and an outer sleeve sleeved on the inner sleeve. One end of the inner sleeve facing the limit block is slidably connected and sealingly fitted with the guide rod. One end of the inner sleeve facing the baffle is sealingly connected with the outer sleeve. The outer surface of the outer sleeve forms the first sealing surface, and a first opening is formed between the outer surface of the inner sleeve and the inner surface of the outer sleeve.

[0012] Further, one end of the inner sleeve facing the baffle is sealingly connected with the inner surface of the outer sleeve through a snap ring.

[0013] Further, a spring backing plate is arranged on the snap ring.

[0014] In a second aspect, a pressure valve is provided, which includes a valve body and a valve core. The valve core is the valve core provided in the first aspect. An oil inlet, a high-temperature oil outlet, a low-temperature oil outlet and a valve core hole are arranged on the outer surface of the valve body. The oil inlet is communicated with the high-temperature oil outlet. The inner end of the valve core hole is communicated with the oil inlet. A third opening communicated with the low-temperature oil outlet is arranged on the inner surface of the valve core hole. The baffle is connected with the valve body and sealingly covers the outer end of the valve core hole. The valve core seat is slidably installed in the valve core hole, and the first sealing surface is sealingly fitted with the inner surface of the valve core hole. When the valve core seat slides along the valve core hole, the second opening is selectively communicated with or disconnected from the third opening.

[0015] Further, the baffle is bolted to the valve body.

[0016] In a third aspect, a lubricating oil cooling system is provided, which includes an oil sump, an oil pump, a filter, a pressure valve, a cooler and a distributor. The pressure valve is the pressure valve provided in the second aspect. The oil sump is communicated with the inlet of the oil pump. The outlet of the oil pump is communicated with the inlet of the filter. The outlet of the filter is communicated with the oil inlet of the pressure valve. The high-temperature oil outlet is communicated with the inlet of the cooler. The outlet of the cooler is communicated with the inlet of the distributor. The outlet of the distributor is communicated with the oil sump. The low-temperature oil outlet is communicated with the inlet of the distributor.

[0017] Advantages of the present application:

[0018] The valve core, the pressure valve and the lubricating oil cooling system provided by the embodiments of the present application adopt a double-spring structure composed of a first spring and a second spring, effectively expanding the opening pressure difference range of the pressure valve, increasing the threshold value of the pressure valve, and enhancing the oil circuit control performance of the pressure valve. It can not only adapt to more complex working conditions, but also ensure the safe operation of the wind power gearbox in various environments. Description of the Drawings

[0019] To more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for the embodiments will be briefly introduced below. It should be understood that the following accompanying drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant accompanying drawings can also be obtained based on these drawings without creative efforts.

[0020] Figure 1 is a schematic structural diagram of a valve core provided by an embodiment of the present application;

[0021] Figure 2 is a schematic structural diagram of a valve core seat;

[0022] Figure 3 is a perspective view of a pressure valve provided by an embodiment of the present application;

[0023] Figure 4 is a front view of a pressure valve provided by an embodiment of the present application;

[0024] Figure 5 is Figure 4 a cross-sectional view along line A-A in

[0025] Figure 6 is a schematic structural diagram of a lubricating oil cooling system provided by an embodiment of the present application.

[0026] Reference numerals:

[0027] 1 - oil sump;

[0028] 2 - oil pump;

[0029] 3 - filter;

[0030] 4 - cooler;

[0031] 5 - distributor;

[0032] 6 - pressure valve;

[0033] 61 - valve body;

[0034] 611 - oil inlet;

[0035] 612 - high-temperature oil outlet;

[0036] 613 - low-temperature oil outlet;

[0037] 614 - valve core hole;

[0038] 615 - third opening;

[0039] 62 - valve core;

[0040] 621 - guide rod;

[0041] 622 - Spool seat;

[0042] 6221 - First sealing surface;

[0043] 6222 - First opening;

[0044] 6223 - Second opening;

[0045] 6224 - Second installation cavity;

[0046] 6225 - First installation cavity;

[0047] 6226 - Oil hole;

[0048] 6227 - Inner sleeve;

[0049] 6228 - Outer sleeve;

[0050] 623 - Baffle;

[0051] 624 - Limit block;

[0052] 625 - First spring;

[0053] 626 - Second spring;

[0054] 627 - Retaining ring;

[0055] 628 - Spring backing plate;

[0056] 63 - Connecting bolt

[0057] 64 - O-ring. Detailed implementation manners

[0058] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application.

[0059] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. And without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0060] In the description of the embodiments of the present application, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. The terms "arranged", "provided with", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components.

[0061] See Figure 1 , an embodiment of the present application provides a valve core 62, including a guide rod 621. A cylindrical valve core seat 622 that is in sealing cooperation with the guide rod 621 is slidably connected to the guide rod 621. A first sealing surface 6221 is formed on the outer peripheral surface of the valve core seat 622. Baffles 623 and limit blocks 624 are respectively connected to both ends of the guide rod 621; a first spring 625 sleeved on the guide rod 621 and a second spring 626 sleeved on the first spring 625 are abutted between the baffle 623 and the valve core seat 622; a first opening 6222 is provided at one end of the valve core seat 622 facing the limit block 624, and a second opening 6223 communicating with the first opening 6222 is provided on the first sealing surface 6221.

[0062] See Figure 1 , the valve core seat 622 is cylindrical. The valve core seat 622 is coaxially arranged with the guide rod 621 and sleeved on the guide rod 621. The valve core seat 622 can slide along the guide rod 621 and is in sealing cooperation with the guide rod 621. The outer peripheral surface of the valve core seat 622 forms a first sealing surface 6221 for sealing cooperation with the inner surface of the valve core hole on the valve body. The baffles 623 and the limit blocks 624 are respectively fixed to both ends of the guide rod 621 for limiting the valve core seat 622 so that the valve core seat 622 moves between the baffle 623 and the limit block 624. The baffle 623 is also used to connect to the valve body and block the outer end of the valve core hole to install the guide rod 621 and the valve core seat 622 in the valve core hole of the valve body. Both the first spring 625 and the second spring 626 are compression springs. The outer diameter of the second spring 626 is larger than the outer diameter of the first spring 625. The first spring 625 is sleeved on the guide rod 621 and its two ends are respectively abutted against the valve core seat 622 and the baffle 623. The second spring 626 is sleeved on the first spring 625 and its two ends are respectively abutted against the valve core seat 622 and the baffle 623. The first spring 625 and the second spring 626 jointly provide a force to make the valve core seat 622 in the initial position. The first opening 6222 is provided at one end of the valve core seat 622 facing the limit block 624. The second opening 6223 is provided on the first sealing surface 6221. The first opening 6222 and the second opening 6223 are communicated through a channel provided in the valve core seat 622, thereby forming an oil passage for the lubricating oil to flow.

[0063] The spool 62 provided by the embodiment of the present application is used to be installed in the valve body of a pressure valve to achieve the oil circuit control of the pressure valve. By adopting a double-spring structure composed of a first spring 625 and a second spring 626, the opening pressure difference range of the pressure valve is effectively expanded, the threshold value of the pressure valve is increased, and the oil circuit control performance of the pressure valve is enhanced. Among them, the threshold value of the pressure valve generally refers to the action pressure set point of the valve, that is, the pressure value at which the valve starts to open or close.

[0064] The spool 62 provided by the embodiment of the present application can be pre-assembled in advance, which can streamline the later assembly process of the pressure valve. The specific pre-assembly process is as follows: First, fixedly connect the guide rod 621 with the baffle 623, sleeved the first spring 625 and the second spring 626 on the guide rod 621, then sleeved the spool seat 622 on the guide rod 621. After adjusting the position of the spool seat 622, fixedly connect the limit block 624 with the guide rod 621. Thus, the pre-assembly of the spool 62 is completed.

[0065] In some embodiments, referring to Figure 1 , one end of the spool seat 622 facing the baffle 623 is provided with a second installation cavity 6224, and the bottom of the second installation cavity 6224 is provided with a first installation cavity 6225. One end of the first spring 625 abuts against the bottom of the first installation cavity 6225, and one end of the second spring 626 abuts against the bottom of the second installation cavity 6224. Exemplarily, the first installation cavity 6225 and the second installation cavity 6224 are cylindrical structures coaxial with the guide rod 621, and the inner diameter of the first installation cavity 6225 is smaller than the inner diameter of the second installation cavity 6224. By providing the first installation cavity 6225, it is used for installing and positioning the first spring 625 to prevent the first spring 625 from generating radial displacement during the compression process. By providing the second installation cavity 6224, it is used for installing and positioning the second spring 626 to prevent the second spring 626 from generating radial displacement during the compression process.

[0066] In some embodiments, referring to Figure 1 , an oil hole 6226 communicating with the second installation cavity 6224 is provided on the first sealing surface 6221; in the axial direction of the guide rod 621, the second opening 6223 is located between the first opening 6222 and the oil hole 6226. By providing the oil hole 6226, when the spool seat 622 moves towards the baffle 623 under pressure, the oil in the second installation cavity 6224 can flow out through the oil hole 6226 to improve the situation of trapped oil and too fast action speed in the spool seat 622.

[0067] The baffle 623 and the guide rod 621 can be welded or bolted. The limit block 624 and the guide rod 621 can be connected by welding. In some embodiments, referring to Figure 1, the limiting block 624 is threadedly connected to the guide rod 621. Exemplarily, the limiting block 624 includes a nut, and one end of the guide rod 621 has an external thread section, and the nut is threadedly connected to the external thread section. By threadedly connecting the limiting block 624 to the guide rod 621, not only is the operation convenient, but also the connection position of the limiting block 624 on the guide rod 621 can be flexibly adjusted. After the limiting block 624 is connected to the guide rod 621, the two can also be spot-welded to increase the firmness of the connection between the two.

[0068] The valve core seat 622 can be an integrally formed structure; for example, it is made by precision machining of round steel. In some embodiments, refer to Figure 2 , the valve core seat 622 includes an inner sleeve 6227 sleeved on the guide rod 621 and an outer sleeve 6228 sleeved on the inner sleeve 6227. One end of the inner sleeve 6227 facing the limiting block 624 is slidably connected and sealed with the guide rod 621, one end of the inner sleeve 6227 facing the baffle 623 is sealed and connected with the outer sleeve 6228, the outer surface of the outer sleeve 6228 forms a first sealing surface 6221, and a first opening 6222 is formed between the outer surface of the inner sleeve 6227 and the inner surface of the outer sleeve 6228. Further, one end of the inner sleeve 6227 facing the baffle 623 is sealed and connected with the inner surface of the outer sleeve 6228 through a retaining ring 627. A spring backing plate 628 is arranged on the retaining ring 627.

[0069] Exemplarily, refer to Figure 2 , the inner sleeve 6227 is coaxially arranged inside the outer sleeve 6228. The inner surface of the outer sleeve 6228 has a circle of convex platforms and a circle of grooves on one side of the convex platforms. The inner diameter of the convex platforms is larger than the outer diameter of the inner sleeve 6227. The outer edge of the retaining ring 627 is fixed in the grooves. A flange extending radially outward is integrally formed at the right end of the inner sleeve 6227, and the flange is sealed and fixed between the convex platforms and the retaining ring 627. The spring backing plate 628 is arranged on the retaining ring 627 and is used for abutting against the second spring 626. Among them, the inner cavity of the inner sleeve 6227 forms a first installation cavity 6225, and a second installation cavity 6224 is formed between the inner surface of the outer sleeve 6228 and the spring backing plate 628.

[0070] Refer to Figure 3 、 Figure 4 、 Figure 5, an embodiment of the present application provides a pressure valve 6, which includes a valve body 61 and a valve core 62. An oil inlet 611, a high-temperature oil outlet 612, a low-temperature oil outlet 613, and a valve core hole 614 are provided on the outer surface of the valve body 61. The oil inlet 611 is communicated with the high-temperature oil outlet 612. The inner end of the valve core hole 614 is communicated with the oil inlet 611. A third opening 615 communicated with the low-temperature oil outlet 613 is provided on the inner surface of the valve core hole 614; a baffle 623 is connected to the valve body 61 and hermetically covers the outer end of the valve core hole 614. A valve core seat 622 is slidably installed in the valve core hole 614, and a first sealing surface 6221 is in sealing cooperation with the inner surface of the valve core hole 614; when the valve core seat 622 slides along the valve core hole 614, the second opening 6223 selectively communicates or disconnects from the third opening 615.

[0071] The baffle 623 and the valve body 61 can be connected by welding. For the convenience of installation and disassembly of the baffle 623, in some embodiments, see Figure 3 , Figure 4 , Figure 5 , the baffle 623 and the valve body 61 are connected by bolts. For example, the baffle 623 is fixedly connected to the valve body 61 through four connecting bolts 63. Through holes for the connecting bolts 63 to pass through are provided on the baffle 623, and internal threaded holes for threaded connection with the connecting bolts 63 are provided on the valve body 61. In order to improve the sealing performance between the baffle 623 and the valve body 61, an O-ring 64 is provided between the baffle 623 and the valve body 61.

[0072] See Figure 5 , the figure shows the initial state of the pressure valve 6, specifically: the high-temperature oil outlet 612 is in an always-open state, the second opening 6223 is disconnected from the third opening 615, so that the low-temperature oil outlet 613 is in an always-closed state, and the oil hole 6226 is communicated with the third opening 615.

[0073] The working principle of the pressure valve 6 provided by the embodiment of the present application is: when the pressure in the pressure valve 6 is less than the opening pressure, the lubricating oil flows into the pressure valve 6 through the oil inlet 611 and flows away through the high-temperature oil outlet 612. As the pressure in the pressure valve 6 increases, when the pressure in the pressure valve 6 exceeds the opening pressure, the lubricating oil drives the valve core seat 622 to move a certain distance in the direction of the baffle 623, so that the second opening 6223 communicates with the third opening 615. Furthermore, the oil inlet 611 is communicated with the low-temperature oil outlet 613 through the valve core hole 614, the first opening 6222, the second opening 6223, and the third opening 615 in sequence, so that part of the lubricating oil flows out through the low-temperature oil outlet 613.

[0074] The pressure valve 6 provided in the embodiment of the present application adopts a valve core 62 with a double spring structure composed of a first spring 625 and a second spring 626, which effectively expands the opening pressure difference range of the pressure valve 6, increases the threshold value of the pressure valve 6, and enhances the oil circuit control performance of the pressure valve. It can not only adapt to more complex working conditions, but also ensure the safe operation of the wind power gearbox in various environments when it is applied to the lubrication and cooling system of the wind power gearbox.

[0075] See also Figure 6 The embodiment of the present application provides a lubricating oil cooling system, including an oil pool 1, an oil pump 2, a filter 3, a pressure valve 6, a cooler 4 and a distributor 5, the oil pool 1 is connected to the inlet of the oil pump 2, the outlet of the oil pump 2 is connected to the inlet of the filter 3, the outlet of the filter 3 is connected to the oil inlet 611 of the pressure valve 6, the high-temperature oil outlet 612 is connected to the inlet of the cooler 4, the outlet of the cooler 4 is connected to the inlet of the distributor 5, the outlet of the distributor 5 is connected to the oil pool 1, and the low-temperature oil outlet 613 is connected to the inlet of the distributor 5. Exemplarily, the high-temperature oil outlet 612 is connected to the inlet of the cooler 4 through the high-temperature oil circuit, and the low-temperature oil outlet 613 is connected to the inlet of the distributor 5 through the low-temperature oil circuit.

[0076] See also Figure 6 The working principle of the lubricating oil cooling system provided by the embodiment of the present application is as follows: when the temperature of the oil pool 1 is low, the lubricating oil in the oil pool 1 is pumped to the filter 3 by the oil pump 2, and the lubricating oil flows into the pressure valve 6 after being filtered in the filter 3, and the high-temperature oil outlet 612 of the pressure valve 6 is kept open, and the lubricating oil flows into the cooler 4 through the high-temperature oil circuit, and the lubricating oil flows back to the oil pool 1 through the distributor 5 after being cooled in the cooler 4; in this process, the flow rate of the lubricating oil passing through the high-temperature oil circuit is affected by the back pressure formed by the oil circuit and the cooler 4, and the lubricating oil When the flow rate is small, the pressure of the lubricating oil at the pressure valve 6 will gradually increase. When the pressure at the pressure valve 6 exceeds the threshold, the low-temperature oil outlet 613 opens, and part of the lubricating oil flows back to the oil pool 1 through the low-temperature oil circuit and the distributor 5; when the temperature of the oil pool 1 rises to a predetermined temperature, the back pressure of the lubricating oil flowing through the cooler 4 through the high-temperature oil circuit decreases, and the pressure of the lubricating oil at the pressure valve 6 decreases. When the pressure at the pressure valve 6 is lower than the threshold, the low-temperature oil outlet 613 is closed, and all the lubricating oil flows back to the oil pool 1 through the cooler 4 and the distributor 5 in sequence. Through the above process, the pressure valve 6 completes the flow control of the low-temperature oil and the high-temperature oil, so as to achieve the purpose of heat dissipation of the high-temperature oil through the cooler 4.

[0077] The embodiment of the present application provides a lubricating oil cooling system. By adopting the pressure valve 6 with a double-spring structure composed of the first spring 625 and the second spring 626, the opening pressure difference range of the pressure valve 6 is effectively expanded, the threshold value of the pressure valve 6 is increased, and the oil circuit control performance of the pressure valve 6 is enhanced. It can not only adapt to more complex working conditions, but also avoid the situation where the threshold value of the pressure valve 6 is relatively low in a low-temperature environment when it is applied to the lubricating and cooling system of a wind power gearbox, ensuring the safe operation of the wind power gearbox in various environments.

[0078] The above are only the preferred embodiments of the present application, and do not impose any form of limitation on the present application. Based on the technical essence of the present application, any simple modifications, equivalent replacements, and improvements made to the above embodiments within the spirit and principles of the present application still fall within the protection scope of the technical solution of the present application.

Claims

1. A valve core, characterized in that: It comprises a guide rod (621), a cylindrical valve core seat (622) which is slidably connected to the guide rod (621) and is in sealing cooperation with the guide rod, an outer peripheral surface of the valve core seat (622) forms a first sealing surface (6221), and two ends of the guide rod (621) are respectively connected to a baffle (623) and a limit block (624); A first spring (625) sleeved on the guide rod (621) and a second spring (626) sleeved on the first spring (625) are abutted between the baffle plate (623) and the valve core seat (622); a first opening (6222) is provided at one end of the valve core seat (622) facing the limit block (624), and a second opening (6223) connected to the first opening (6222) is provided on the first sealing surface (6221).

2. The valve core according to claim 1, characterized in that: A second installation cavity (6224) is provided at one end of the valve core seat (622) facing the baffle plate (623), a first installation cavity (6225) is provided at the bottom of the second installation cavity (6224), one end of the first spring (625) abuts against the bottom of the first installation cavity (6225), and one end of the second spring (626) abuts against the bottom of the second installation cavity (6224).

3. The valve core according to claim 2, characterized in that: The first sealing surface (6221) is provided with an oil hole (6226) which is in communication with the second mounting cavity (6224); in the axial direction of the guide rod (621), the second opening (6223) is located between the first opening (6222) and the oil hole (6226).

4. The valve core according to claim 1, characterized in that: The limiting block (624) is threadedly connected to the guide rod (621).

5. The valve core according to claim 1, characterized in that: The valve core seat (622) includes an inner sleeve (6227) sleeved on the guide rod (621) and an outer sleeve (6228) sleeved on the inner sleeve (6227); one end of the inner sleeve (6227) facing the limit block (624) is slidably connected to the guide rod (621) and sealed; one end of the inner sleeve (6227) facing the baffle (623) is sealedly connected to the outer sleeve (6228); the outer surface of the outer sleeve (6228) forms the first sealing surface (6221); and the first opening (6222) is formed between the outer surface of the inner sleeve (6227) and the inner surface of the outer sleeve (6228).

6. The valve core according to claim 5, characterized in that: One end of the inner sleeve (6227) facing the baffle (623) is sealedly connected to the inner surface of the outer sleeve (6228) via a retaining ring (627).

7. The valve core according to claim 6, characterized in that: A spring pad (628) is provided on the retaining ring (627).

8. A pressure valve, characterized in that: It comprises a valve body (61) and a valve core (62), wherein the valve core (62) is the valve core according to any one of claims 1 to 7; An oil inlet (611), a high-temperature oil outlet (612), a low-temperature oil outlet (613) and a valve core hole (614) are provided on the outer surface of the valve body (61); the oil inlet (611) is in communication with the high-temperature oil outlet (612); the inner end of the valve core hole (614) is in communication with the oil inlet (611); and a third opening (615) in communication with the low-temperature oil outlet (613) is provided on the inner surface of the valve core hole (614); The baffle (623) is connected to the valve body (61) and sealingly covers the outer end of the valve core hole (614); the valve core seat (622) is slidably installed in the valve core hole (614), and the first sealing surface (6221) is sealed with the inner surface of the valve core hole (614); when the valve core seat (622) slides along the valve core hole (614), the second opening (6223) is selectively connected or disconnected with the third opening (615).

9. The pressure valve according to claim 8, characterized in that The baffle (623) is bolted to the valve body (61).

10. A lubricating oil cooling system, characterized in that: It comprises an oil pool (1), an oil pump (2), a filter (3), a pressure valve (6), a cooler (4) and a distributor (5), wherein the pressure valve (6) is the pressure valve according to any one of claims 8 to 9; The oil pool (1) is connected to the inlet of the oil pump (2), the outlet of the oil pump (2) is connected to the inlet of the filter (3), the outlet of the filter (3) is connected to the oil inlet (611) of the pressure valve (6), the high-temperature oil outlet (612) is connected to the inlet of the cooler (4), the outlet of the cooler (4) is connected to the inlet of the distributor (5), the outlet of the distributor (5) is connected to the oil pool (1), and the low-temperature oil outlet (613) is connected to the inlet of the distributor (5).

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