One-way valve and reciprocating plunger pump

Abstract

A one-way valve and a reciprocating plunger pump include a valve body and a valve seat coaxially and sealed together. Both the valve body and the valve seat are hollow cylinders with openings at both ends. From its connecting end to its free end, the valve body includes a first connecting section, a valve core limiting section, and a spring limiting section arranged coaxially in sequence. The inner cavity of the spring limiting section is coaxial, and a spring is provided at one end. The other end of the spring extends to the valve core limiting section, and a valve core is provided between the other end of the spring and one port of the valve seat. The valve core and the first port of the valve seat are structurally matched. When the spring is in a free state, the valve core is pushed by the other end of the spring to seal against the first port of the valve seat. Through the reasonable design of the component structure, the overall structure is easy to implement, has low cost, high cost-effectiveness, strong resistance to contamination, long service life, and good versatility.

Description

Technical Field

[0001] This utility model belongs to the field of one-way pump technology, specifically relating to a one-way valve and a reciprocating plunger pump. Background Technology

[0002] Reciprocating piston pumps are widely used in some vehicles due to their simple structure. Their pumping process mainly relies on two check valves at the inlet and outlet to achieve oil suction and pressure, thus completing the function of outputting oil. However, some check valves have complex structures and are prone to premature failure when used in high-frequency operations. Utility Model Content

[0003] To address the aforementioned problems, the purpose of this invention is to provide a one-way valve and a reciprocating plunger pump, solving the issues of complex structure and high failure rate of traditional one-way pumps. To achieve the above objectives, the technical solution adopted by this utility model includes: A one-way valve includes a valve body and a valve seat coaxially and sealed together. Both the valve body and the valve seat are hollow cylinders with open ends. The valve body includes a first connecting section, a valve core limiting section, and a spring limiting section arranged coaxially from its connecting end to its free end. The inner cavity of the spring limiting section is coaxial and a spring is provided at one end. The other end of the spring extends to the valve core limiting section, and a valve core is provided between the other end of the spring and one port of the valve seat. The valve core and the first port of the valve seat are structurally matched. When the spring is in a free state, the valve core is pushed by the other end of the spring to make sealing contact with the first port of the valve seat.

[0004] Preferably, the inner diameter of the valve core limiting section gradually increases from one end to the other, and the inner diameter of the other end of the valve core limiting section is greater than the maximum outer diameter of the valve core and greater than the inner diameter of one end of the valve core limiting section; at least one oil passage is opened on the inner circumference of the connecting section between the valve core limiting section and the spring limiting section, and one end of the oil passage extends into the inner cavity of the spring limiting section.

[0005] Preferably, the oil passage is an axial oil passage.

[0006] Preferably, each oil passage is evenly distributed along the inner circumference of the valve body.

[0007] Preferably, the inner circumference of the spring limiting section matches the spring structure.

[0008] Preferably, the valve seat includes a second connecting section and a valve seat limiting section arranged coaxially from its connecting end to its free end. The outer periphery of the second connecting section matches the inner periphery structure of the first connecting section, and the outer diameter of the valve seat limiting section is larger than the inner diameter of the first connecting section.

[0009] Preferably, a sealing ring is provided coaxially between the first connecting section and the valve seat limiting section.

[0010] Preferably, the spring limiting section extension end is also coaxially provided with a first external extension section, and the inner diameter of the spring limiting section is larger than the inner diameter of the first external extension section.

[0011] Preferably, the valve seat limiting section extension end is also coaxially provided with a second external extension section.

[0012] A reciprocating piston pump includes a check valve connected to the inlet and outlet of the reciprocating piston pump, the check valve being the check valve disclosed in this application; the free end of the valve body of the check valve located at the inlet of the reciprocating piston pump is in sealed communication with the inlet of the reciprocating piston pump, and the free end of the valve seat of the check valve located at the outlet of the reciprocating piston pump is in sealed communication with the outlet of the reciprocating piston pump.

[0013] Compared with the prior art, the advantages of this utility model are: (1) The one-way valve of this utility model has a reasonable component structure, which makes the overall structure easy to implement, has low cost, high cost performance, strong dirt resistance, long service life and good versatility.

[0014] (1) The present invention provides a one-way valve and a reciprocating plunger pump. Through the reasonable arrangement of the component structure, when the pressure in the oil chamber of the reciprocating plunger pump decreases, the one-way valve at the oil inlet opens and the one-way valve at the oil outlet closes, and the reciprocating plunger pump is in the oil suction state, that is, the oil is drawn into the oil chamber of the reciprocating plunger pump from the oil inlet; when the pressure in the oil chamber of the reciprocating plunger pump increases, the one-way valve at the oil inlet closes and the one-way valve at the oil outlet opens, and the reciprocating plunger pump is in the oil discharge state, that is, the oil flows out from the oil outlet. The overall structure is easy to implement. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the one-way valve in Example 1 when it is in the closed state; Figure 2 This is a schematic diagram of the one-way valve in the open state of Example 1; Figure 3 for Figure 1 Exploded view; Figure 4 for Figure 1 Schematic diagram of the middle valve body; Figure 5 for Figure 1 A schematic diagram of the structure of the middle valve seat.

[0016] The labels in the diagram represent: 1-Valve body, 2-Spring, 3-Valve core, 4-Sealing ring, 5-Valve seat; 1a First connecting section, 1b Valve core limiting section, 1c Spring limiting section, 1d First external extension section; 5a Second connecting section, 5b Valve seat limiting section, 5c Second external extension section; 101 Oil passage, 102 Step surface. Detailed Implementation

[0017] The utility model is not limited to the following specific embodiments. All equivalent modifications made based on the technical solution of this application fall within the protection scope of this utility model.

[0018] It should be noted that the directional terms mentioned in this document, such as "inner cavity," "inner circumference," "inner wall," and "outer side," are consistent with the specific directions on the paper in the accompanying drawings or the corresponding directions of the space shown in the drawings; all components and devices in this utility model, unless otherwise specified, adopt components and devices known in the prior art.

[0019] Example 1 A one-way valve includes a valve body 1 and a valve seat 5 coaxially and sealed together. Both the valve body 1 and the valve seat 5 are hollow cylinders with open ends. The valve body 1 includes a first connecting section 1a, a valve core limiting section 1b, and a spring limiting section 1c arranged coaxially from its connecting end to its free end. The inner cavity of the spring limiting section 1c is coaxial and a spring 2 is provided at one end. The other end of the spring 2 extends to the valve core limiting section 1b, and a valve core 3 is provided between the other end of the spring 2 and one port of the valve seat 5. The valve core 3 is structurally matched with one port of the valve seat 5. When the spring 2 is in a free state, the valve core 3 is pushed by the other end of the spring 2 to make sealing contact with one port of the valve seat 5. Its function is as follows: the valve body 1 is sealed and connected to the valve seat 5 through the first connecting section 1a. When the pressure in the valve seat 5 port is less than or equal to the pressure in the valve body 1 port, the spring 2 is in a free state, and the valve core 3 is pushed by the other end of the spring 2 to seal and contact one port of the valve seat 5, that is, the internal passage of the one-way valve is closed; when the pressure in the valve seat 5 port is greater than the pressure in the valve body 1 port, the pressure difference overcomes the spring force, and the valve core 3 pushes the spring 2 to compress, that is, the internal passage of the one-way valve is opened; the overall structure is easy to implement, has low cost, high cost performance, and long service life.

[0020] In this embodiment, the valve core 3 can be a ball or other shapes, as long as it matches the structure of one port of the valve seat 5. Figure 1 As shown, the inner circumference of one port of valve seat 5 is provided with a bevel angle that matches the structure of valve core 3, so as to improve the sealing performance after valve core 3 and one port of valve seat 5 are in full contact.

[0021] In this embodiment, the inner diameter of the valve core limiting section 1b gradually increases from one end to the other, and the inner diameter of the other end of the valve core limiting section 1b is greater than the maximum outer diameter of the valve core 3 and greater than the inner diameter of one end of the valve core limiting section 1b; at least one oil passage 101 is provided on the inner circumference of the connecting section between the valve core limiting section 1b and the spring limiting section 1c, and one end of the oil passage 101 extends into the inner cavity of the spring limiting section 1c. Its function is as follows: when the pressure in the valve seat 5 port is greater than the pressure in the valve body 1 port enough to overcome the pre-tightening compression force of the spring 2, the spring 2 is compressed, the valve core 3 contacts and is limited by the inner circumference of one port of the valve core limiting section 1b. At this time, the one-way valve opens, and the oil in the valve seat 5 flows into the inner cavity of the valve body 1 through the oil passage 101 and is sent out from the free end of the valve body 1.

[0022] In this embodiment, the oil passage 101 is an axial oil passage, and there are a total of 4 oil passages 101, which are evenly distributed along the inner circumference of the valve body 1.

[0023] In this embodiment, the inner circumference of the spring limiting segment 1c matches the structure of the spring 2 so that the spring 2 is radially limited.

[0024] In this embodiment, the valve seat 5 includes a second connecting section 5a and a valve seat limiting section 5b arranged coaxially from its connecting end to its free end. The outer circumference of the second connecting section 5a matches the inner circumference of the first connecting section 1a to achieve a sealed connection between the second connecting section 5a and the first connecting section 1a. In this embodiment, the second connecting section 5a and the first connecting section 1a can be connected by a thread or by an interference fit. The outer diameter of the valve seat limiting section 5b is larger than the inner diameter of the first connecting section 1a to facilitate axial limiting assembly between the valve seat 5 and the valve body 1.

[0025] In this embodiment, a sealing ring 4 is provided coaxially between the first connecting section 1a and the valve seat limiting section 5b to improve the sealing performance of the connection between the valve seat 5 and the valve body 1.

[0026] In this embodiment, the valve seat limiting section 5b is also coaxially provided with a second external extension section 5c, and the spring limiting section 1c is also coaxially provided with a first external extension section 1d. The outer peripheral structure of the first external extension section 1d and the second external extension section 5c can be set according to the usage requirements. The outer peripheral structure of the first external extension section 1d and the second external extension section 5c can be the same, which can be used to connect to the oil port or to the oil pipe, thereby improving versatility. The outer peripheral structure of the first external extension section 1d and the second external extension section 5c can also be different or other structures can be used, such as quick-connect fittings or even screw plugs with holes.

[0027] In this embodiment, the inner diameter of the spring limiting segment 1c is larger than the inner diameter of the first outward extension segment 1d, such as... Figure 4 As shown, the junction of the spring limiting section 1c and the first outward extension section 1d is a stepped surface, which facilitates the axial limiting of one end of the spring 2.

[0028] In this embodiment, the valve core has a large gap with the valve body during movement, thereby ensuring that the valve core is not easily stuck and has better dirt resistance.

[0029] Example 2 This embodiment discloses a reciprocating piston pump, including a check valve connected to the oil inlet and oil outlet of the reciprocating piston pump respectively. The check valve is the check valve disclosed in Embodiment 1. The free end of the valve body 1 of the check valve located at the oil inlet of the reciprocating piston pump is connected to the oil inlet of the reciprocating piston pump, and the free end of the valve seat 5 of the check valve located at the oil outlet of the reciprocating piston pump is connected to the oil outlet of the reciprocating piston pump. Its function is as follows: The piston inside the reciprocating piston pump moves back and forth. When the oil chamber pressure inside the reciprocating piston pump decreases, the one-way valve at the oil inlet opens, and at the same time, the one-way valve at the oil outlet closes, and the reciprocating piston pump is in an oil suction state, that is, oil is drawn into the oil chamber of the reciprocating piston pump through the oil inlet; when the oil chamber pressure inside the reciprocating piston pump increases, the one-way valve at the oil inlet closes, and at the same time, the one-way valve at the oil outlet opens, and the reciprocating piston pump is in an oil discharge state, that is, oil flows out through the oil outlet; the overall structure is easy to implement, has low cost, high cost performance, and long service life.

[0030] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0031] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0032] Furthermore, the various implementation methods disclosed in this solution can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content invented by this disclosure.

Claims

1. A one-way valve, characterized in that, The valve body (1) and valve seat (5) are coaxially sealed and connected. Both valve body (1) and valve seat (5) are hollow cylinders with openings at both ends. The valve body (1) includes a first connecting section (1a), a valve core limiting section (1b) and a spring limiting section (1c) arranged coaxially from its connecting end to its free end. The inner cavity of the spring limiting section (1c) is coaxial and a spring (2) is provided at one end. The other end of the spring (2) extends to the valve core limiting section (1b), and a valve core (3) is provided between the other end of the spring (2) and one port of the valve seat (5). The valve core (3) is structurally matched with one port of the valve seat (5). When the spring (2) is in a free state, the valve core (3) is pushed by the other end of the spring (2) to make a sealing contact with one end of the valve seat (5); The inner diameter of the valve core limiting section (1b) gradually increases from one end to the other, and the inner diameter of the other end of the valve core limiting section (1b) is greater than the maximum outer diameter of the valve core (3) and greater than the inner diameter of one end of the valve core limiting section (1b); at least one oil passage (101) is provided on the inner circumference of the connecting section between the valve core limiting section (1b) and the spring limiting section (1c), and one end of the oil passage (101) extends into the inner cavity of the spring limiting section (1c); The oil passage (101) is an axial oil passage; Each oil passage (101) is evenly distributed along the inner circumference of the valve body (1); The inner circumference of the spring limiting section (1c) matches the structure of the spring (2); The valve seat (5) includes a second connecting section (5a) and a valve seat limiting section (5b) arranged coaxially from its connecting end to its free end. The outer periphery of the second connecting section (5a) matches the inner periphery structure of the first connecting section (1a). The outer diameter of the valve seat limiting section (5b) is larger than the inner diameter of the first connecting section (1a). The spring limiting section (1c) is also coaxially provided with a first outward extension section (1d), and the inner diameter of the spring limiting section (1c) is larger than the inner diameter of the first outward extension section (1d). The valve seat limiting section (5b) is also coaxially provided with a second external extension section (5c).

2. The one-way valve as described in claim 1, characterized in that, A sealing ring (4) is provided coaxially between the first connecting section (1a) and the valve seat limiting section (5b).

3. A reciprocating piston pump, characterized in that, Includes a check valve connected to the oil inlet and oil outlet of a reciprocating plunger pump, wherein the check valve is the check valve according to any one of claims 1-2; The free end of the valve body (1) of the check valve located at the oil inlet of the reciprocating plunger pump is sealed and connected to the oil inlet of the reciprocating plunger pump, and the free end of the valve seat (5) of the check valve located at the oil outlet of the reciprocating plunger pump is sealed and connected to the oil outlet of the reciprocating plunger pump.

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