Transmission case of cryogenic liquid pump

Abstract

The utility model relates to the technical field of low-temperature pump equipment, in particular to a low-temperature liquid pump transmission case which comprises a case body, a connecting rod assembly, a transmission shaft, a crosshead assembly and a supporting assembly, the connecting rod assembly, the transmission shaft and the crosshead assembly are installed in the case body, and the supporting assembly is connected to the outer portion of the case body. An eccentric wheel, an oil flinger and bearings located on the two sides of the eccentric wheel are arranged on the transmission shaft, the front end of the connecting rod assembly is connected with the crosshead assembly through a crosshead pin, a needle bearing is embedded in the rear end of the connecting rod assembly, the eccentric wheel is sleeved with the needle bearing, the front end of the crosshead assembly extends out of the box body, and the rear end of the crosshead assembly extends out of the box body. The internal volume of the box body is small, the amount of filled lubricating oil is small, and the use and maintenance cost of a user is reduced; the eccentric wheel and the connecting rod assembly are connected through the needle bearing, and the requirement for the oil amount is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of cryogenic pump equipment, in particular to a cryogenic liquid pump transmission box. Background Art

[0002] With the development of industry, cryogenic liquid pumps for industrial gases are also widely used in this field. The basic industrial gas media are oxygen, nitrogen and argon, among which oxygen media are more dangerous. "GB16912-2008" Safety Technical Regulations for the Production of Oxygen and Related Gases by Deep Freezing, 6.4.4: Liquid oxygen pump bearings should use special grease and strictly control the amount of oil filling. However, the price of special grease for oxygen pumps is relatively expensive. The general amount of lubricating oil for oxygen pump transmission box is 3-5L / unit. Compared with ordinary lubricating oil for nitrogen and argon, the cost of oxygen lubricating oil is increased by 8-10 times, and the demand for oxygen is the largest. In order to reduce production costs, the existing technology adopts the method of switching to grease lubrication for transmission box, but grease lubrication has a short service life and a high equipment failure rate. Therefore, a transmission box with low oil demand is more in line with actual needs. Therefore, it is very necessary to design a transmission box with low oil demand. Summary of the Invention

[0003] The purpose of the utility model is to solve the above-mentioned shortcomings in the prior art and to propose a low-temperature liquid pump transmission box.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A low-temperature liquid pump transmission box is designed, including a box body, a connecting rod assembly, a transmission shaft, a crosshead assembly and a support assembly. The connecting rod assembly, transmission shaft and crosshead assembly are installed in the box body, and the support assembly is connected to the outside of the box body. An eccentric wheel, an oil-slinging pan and bearings on both sides of the eccentric wheel are provided on the transmission shaft. The front end of the connecting rod assembly and the crosshead assembly are connected by a crosshead pin, and a needle bearing is embedded in the rear end. The needle bearing is sleeved on the eccentric wheel. The front end of the crosshead assembly extends out of the box body and is located in the hollow part of the support assembly.

[0006] Furthermore, an inclined oil return hole is provided inside the box.

[0007] Furthermore, a flow hole is provided inside the connecting rod of the connecting rod assembly.

[0008] Furthermore, there are two oil-slinging pans, which are located on both sides of the eccentric wheel.

[0009] Furthermore, a connector is embedded inside the front end small head of the crosshead assembly.

[0010] Furthermore, a cylinder sleeve is sleeved on the surface of the front end small head of the crosshead assembly.

[0011] Furthermore, a visual window cover is provided on each of the upper and lower surfaces of the support assembly, an oil seal is installed inside the cover, and the oil seal is sleeved on the surface of the cylinder liner.

[0012] Furthermore, a temperature probe and a purge air inlet connector are provided on the upper surface of the support assembly, the purge air inlet connector is communicated with the hollow portion of the support assembly, and a purge air outlet interface is provided on the lower surface of the support assembly.

[0013] The utility model provides a low-temperature liquid pump transmission box, which has the following beneficial effects:

[0014] The internal volume of the box body of the utility model is small, and the amount of lubricating oil added is small, which reduces the user's use and maintenance costs; the eccentric wheel and the connecting rod assembly are connected by needle bearings, which reduces the demand for oil; by arranging oil-slinging pans on both sides of the eccentric wheel, the lubricating oil at a low oil level can be swung to the crosshead lubrication point at a high position; by arranging a cylinder sleeve on the surface of the crosshead assembly, rust is prevented and the service life of the oil seal is increased; the support assembly of the transmission box adopts a temperature probe, a visual window cover plate 2 and a purge air intake joint structure, which can monitor the oxygen leakage temperature at any time and blow away the leaked oxygen to prevent oxygen from entering the transmission box and accumulating in the air to cause safety hazards; the setting of the visual window cover plate 2 makes it easy to observe the oil level and the oil quality of the lubricating oil at any time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the utility model;

[0016] Figure 2 This is another structural diagram of the utility model;

[0017] Figure 3 This is a side view of the utility model; DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] Example, see Figure 1-3A cryogenic liquid pump transmission box includes a box body 10, a connecting rod assembly 20, a transmission shaft 30, a crosshead assembly 40 and a support assembly 50. The connecting rod assembly 20, the transmission shaft 30 and the crosshead assembly 40 are installed in the box body 10, and the support assembly 50 is connected to the outside of the box body 10. The transmission shaft 30 is provided with an eccentric wheel 301, an oil-slinging plate 302 and bearings 303 located on both sides of the eccentric wheel 301. The front end of the connecting rod assembly 20 and the crosshead assembly 40 are connected by a crosshead pin 202. The rear end is embedded with a needle bearing 201, and the needle bearing 201 is sleeved on the eccentric wheel 301. The front end of the crosshead assembly 40 extends out of the box body 10 and is located in the hollow part of the support assembly 50.

[0020] The internal volume of the box 10 of the present invention is small, and the amount of lubricating oil added is small, which reduces the user's use and maintenance costs; the eccentric wheel 301 and the connecting rod assembly 20 are connected by a needle bearing 201, which reduces the demand for oil.

[0021] In an optional embodiment of the present invention, an oil return inclined hole 103 is provided inside the box body 10. The setting of the oil return inclined hole 103 can return the oil at the front end of the crosshead pin 202 to the bottom of the box body 10, forming a self-circulation. An air filter 101 and a lifting lug 102 are provided on the top of the box body 10, an oil plug nut 104 is provided at the rear bottom of the box body 10, and a visual window cover 105 is provided at the rear of the box body 10 to observe the oil level and the oil quality of the lubricating oil.

[0022] In an optional embodiment of the present invention, a flow hole 203 is provided inside the connecting rod 204 of the connecting rod assembly 20 .

[0023] In an optional embodiment of the present invention, there are two oil-slinging plates 302 located on both sides of the eccentric wheel 301. The oil-slinging plates 302 on both sides of the eccentric wheel 301 can swing the lubricating oil at a low oil level to the crosshead lubrication area at a high position.

[0024] In an optional embodiment of the present invention, a connector 401 is embedded in the front end of the small head of the crosshead assembly 40. Preferably, the connector 401 in this embodiment is fastened by screws.

[0025] In an optional embodiment of the present invention, a cylinder sleeve 402 is provided on the surface of the front end small head of the crosshead assembly 40 through a cold sleeve process. Preferably, the surface of the cylinder sleeve is chrome-plated, and the surface roughness reaches 0.2-0.4. The cylinder sleeve 402 is provided on the surface of the crosshead assembly 40 and is chrome-plated to prevent rust and improve the service life of the oil seal.

[0026] In an optional embodiment of the present invention, a second visual window cover plate 501 is provided on the upper and lower surfaces of the support assembly 50 , and an oil seal 502 is installed inside the second visual window cover plate 501 . The oil seal 502 is sleeved on the surface of the cylinder sleeve 402 .

[0027] In an optional embodiment of the present invention, a temperature probe 503 and a purge air inlet connector 504 are provided on the upper surface of the support assembly 50, and the purge air inlet connector 504 is communicated with the hollow part of the support assembly 50, and a purge air outlet interface 505 is provided on the lower surface of the support assembly 50. Preferably, a three-way structure is formed between the purge air outlet interface 505 and the oil seal groove, and the other end leads to the interior of the box body 10; the support assembly 50 of the transmission box adopts the structure of a temperature probe 503, a visual window cover plate 2 501 and a purge air inlet connector 504, which can monitor the oxygen leakage temperature at any time and blow away the leaked oxygen to prevent oxygen from entering the transmission box and accumulating in the air to cause safety hazards; the setting of the visual window cover plate 2 501 makes it easy to observe the oil level and the oil quality of the lubricating oil at any time.

[0028] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

[0029] In the description of this specification, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the technical solutions of this patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this patent application.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this patent application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0031] In this specification, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this specification based on specific circumstances.

[0032] In this specification, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0033] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0034] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A cryogenic liquid pump transmission box, characterized in that: The invention comprises a housing (10), a connecting rod assembly (20), a transmission shaft (30), a crosshead assembly (40) and a support assembly (50), wherein the connecting rod assembly (20), the transmission shaft (30) and the crosshead assembly (40) are installed in the housing (10), the support assembly (50) is connected to the outside of the housing (10), an eccentric wheel (301), an oil-slinging plate (302) and bearings (303) located on both sides of the eccentric wheel (301) are provided on the transmission shaft (30), the front end of the connecting rod assembly (20) and the crosshead assembly (40) are connected through a crosshead pin (202), a needle bearing (201) is embedded in the rear end, and the needle bearing (201) is sleeved on the eccentric wheel (301), and the front end of the crosshead assembly (40) extends out of the housing (10) and is located in the hollow part of the support assembly (50).

2. The cryogenic liquid pump transmission box according to claim 1, characterized in that: An oil return inclined hole (103) is provided inside the box (10).

3. The cryogenic liquid pump transmission box according to claim 1, characterized in that: A flow hole (203) is provided inside the connecting rod (204) of the connecting rod assembly (20).

4. The cryogenic liquid pump transmission box according to claim 1, characterized in that: There are two oil-spinning plates (302), which are located on both sides of the eccentric wheel (301).

5. The cryogenic liquid pump transmission box according to claim 1, characterized in that: A connecting head (401) is embedded in the front end small head of the cross head assembly (40).

6. The cryogenic liquid pump transmission box according to claim 1, characterized in that: A cylinder sleeve (402) is sleeved on the front end surface of the small head of the crosshead assembly (40).

7. The cryogenic liquid pump transmission box according to claim 6, characterized in that: The upper and lower surfaces of the support assembly (50) are each provided with a viewing window cover (501), an oil seal (502) is installed inside the viewing window cover, and the oil seal (502) is sleeved on the surface of the cylinder sleeve (402).

8. The cryogenic liquid pump transmission box according to claim 1, characterized in that: A temperature probe (503) and a purge air inlet connector (504) are provided on the upper surface of the support assembly (50), the purge air inlet connector (504) is communicated with the hollow portion of the support assembly (50), and a purge air outlet interface (505) is provided on the lower surface of the support assembly (50).

Images