KR20070075895A - Oil pumping apparatus for linear compressor - Google Patents

Abstract

An oil supply device for a linear compressor is provided to prevent oil springs from being out of line, horizontally maintain the oil springs in axial direction, and to prevent a mass member from being abraded by an oil cylinder by respectively inserting an oil spring into each fixing guide protrusion. An oil supply device for a linear compressor comprises a main body frame(53), an oil supply flow path(62), an oil cylinder(72), an oil supply valve assembly(80), a mass member(74) and a guide unit. The main body frame fixes a cylinder and a linear motor. The oil supply flow path is communicated with the oil supply flow path between a cylinder(52) and a piston. The oil cylinder is formed on one surface of the main body frame so as to be communicated with the oil supply flow path. The oil supply valve assembly is installed on the other surface of the main body frame so as to be communicated with the oil supply flow path. The mass member has both ends elastically supported by a pair of oil springs(76a, 76b), and is installed inside the oil cylinder so as to be linearly reciprocated. The guide unit elastically supports the oil springs between both ends of the mass member, a final end of the oil cylinder, and the oil supply valve assembly in direction opposite to it.

Description

OIL PUMPING APPARATUS FOR LINEAR COMPRESSOR}

1 is a side sectional view showing an oil supply device of a linear compressor according to the prior art;

2 is a side sectional view showing an oil supply device of the linear compressor according to the present invention;

Figure 3 is a side cross-sectional view showing a first embodiment of the oil spring support structure in the oil supply device of the linear compressor according to the present invention,

Figure 4 is a side sectional view showing a second embodiment of the oil spring support structure in the oil supply device of the linear compressor according to the present invention.

<Explanation of symbols on main parts of the drawings>

51 structure 52 cylinder

52h: cylinder groove 53: body frame

54: piston 54h: piston groove

56: suction valve 58: discharge valve assembly

58a: discharge valve 58b: discharge cap

58c: discharge valve spring 60: oil circulation passage

62: oil supply flow path 64: oil recovery flow path

72: oil cylinder 74: mass member

76a, 76b: oil spring 78: fixed cap

78a, 78b: fixed guide protrusion 80: oil supply valve assembly

The present invention is installed in the shell so that the structure consisting of a cylinder, a piston and a linear motor is elastically supported at the same time the oil of the linear compressor to pump between the cylinder and the piston by pumping the oil stored in the lower shell as the piston reciprocates linearly in the cylinder In particular, the supply device is a linear compressor that is assembled at an accurate position such that both ends of the mass member are elastically supported in the axial direction by a pair of oil springs inside the oil cylinder, and is also reliably supported even when an eccentric force is applied. Of the oil supply unit.

1 is a side sectional view showing an oil supply device of a linear compressor according to the prior art.

The oil supply apparatus of the linear compressor according to the prior art is a structure (1) consisting of a cylinder (2), a piston (4) and a linear motor (not shown) installed inside a closed shell (not shown) as shown in FIG. It is installed on the lower portion, the oil supply passage 12 and the oil recovery passage 14 is formed in one main body frame 3 so as to communicate with the oil circulation passage 10 formed between the cylinder (2) and the piston (4). In addition, the mass member 24 inside the oil cylinder 22 installed to communicate under the oil supply passage 12 generates a pressure difference while reciprocating linearly moving in an elastically supported state by the oil springs 26a and 26b. The oil supply pipe 21 installed in the oil stored in the lower part of the shell communicates with one side of the oil cylinder 22, and at the same time, an oil for controlling oil supply between the oil supply passage 12 and the oil cylinder 22. The supply valve assembly 30 is installed.

Here, the body frame (3) is fixed to the cylinder (2) and the linear motor, the piston (4) reciprocating linear motion between the top dead center (TDC) and the bottom dead center (BDC) inside the cylinder (2) While the suction stroke to suck the refrigerant into the compression space (P) formed therebetween, the compression stroke to compress and discharge is repeatedly performed.

At this time, a suction valve 6 for sucking the refrigerant at one end of the piston 4 is installed, and a discharge valve 8a for discharging the compressed refrigerant at one end of the cylinder 2 is fixed to one end of the cylinder 2. The discharge valve assembly 8 elastically supported by the spring 8c inside the discharge cap 8b is installed to be opened and closed.

Next, the oil supply passage 12 and the oil recovery passage 14 are formed in the body frame 3 and in the cylinder 2 to form an oil circulation passage formed between the cylinder 2 and the piston 4 ( 10) so that oil can be supplied and recovered, and the oil circulation passage 10 has a ring-shaped cylinder groove 2h and a piston groove 4h on the inner circumferential surface of the cylinder 2 and the outer circumferential surface of the piston 4, respectively. It is formed to overlap each other to allow the oil to circulate.

At this time, the oil supply passage 12 and the oil recovery passage 14 is formed to communicate with the cylinder groove (2h), it is installed so as to communicate with each one end of the cylinder groove (2h) in the top dead center (TDC) direction.

Next, one end of the oil cylinder 22 is fixed to the body frame 3 so that the oil cylinder 22 may be vibrated in the same manner as the structure 1, and the oil supply passage 12 is formed on one surface of the body frame 3. ) Is installed to be press-fit into the mounting groove (3h) formed to communicate with.

Next, the mass member 24 is installed to reciprocate linearly in the oil cylinder 22 by an inertial force against vibration of the oil cylinder 22, and the inner diameter of the oil cylinder 22 and a predetermined gap. A support body 24b, 24b ', which is placed and held by the oil springs 26a and 26b, protrudes axially in the center of the mass body 24a and both end portions thereof.

At this time, the oil cylinder 22 is provided with a separate fixing cap 28 so that one end is supported by the mounting groove (3h) at the same time to block the other end, the oil spring (26a, 26b) is the mass member ( It is installed between one end of the 24 and the mounting groove (3h) and is elastically supported between the other end of the mass member 24 and the fixing cap 28.

Of course, the mass member 24 pumps oil by generating a pressure difference in the oil cylinder 22 while reciprocating linearly moving in the axial direction elastically supported by the oil springs 26a and 26b.

Next, the oil supply valve assembly 30 is installed at one side of the main body frame 3 through which the oil cylinder 22 and the oil supply passage 12 communicate with each other to draw an oil suction valve (not shown) and oil for sucking oil. An oil discharge valve (not shown) for discharging is provided with a plate-shaped valve seat (not shown) formed so as to be openable and closed, and a suction storage space and a discharge storage space where oil can be temporarily stored by being overlapped on the outside of the valve seat. And a seat cover (not shown) forming a space.

Of course, the oil supply passage 12 is installed in the lower portion so that the oil supply pipe 21 is in communication, the oil supply pipe 21 is installed so that the end is contained in the oil stored in the shell.

Therefore, the oil supply device configured as described above causes the structure 1 and the oil cylinder 22 fixed thereto to vibrate as the piston 4 reciprocates linearly in the cylinder 2, and the mass member. The internal pressure is variable as the 24 reciprocates linearly inside the oil cylinder 22 by the inertial force against the vibration, and the oil is supplied to the oil supply pipe 21 as the pressure inside the oil cylinder 22 is changed. At the same time, the oil suction valve and the oil discharge valve are pumped along the oil supply passage 12 due to the opening and closing of the oil suction valve.

Thereafter, the oil supplied along the oil supply passage 12 circulates along the oil circulation passage 10 to cool and simultaneously lubricate heat generated between the cylinder 2 and the piston 4, The oil is returned to the lower portion of the shell along the oil return passage 14.

However, in the oil supply apparatus of the linear compressor according to the prior art, both side support protrusions 24b and 24b 'of the mass member are fixed to the oil cylinder 22 by a pair of oil springs 26a and 26b. The oil springs are installed in the cap 28 and the mounting groove 3h so as to be elastically supported, and the mass member 24 is positioned to maintain a predetermined gap in the inner diameter of the oil cylinder 22 so that an eccentric force is applied to the oil springs. (26a, 26b) is deviated from the axial direction so that the mass member 24 abuts against the inner diameter of the oil cylinder 22 can be worn, as a result there is a problem that the operating reliability is also lowered.

The present invention has been made in order to solve the above problems of the prior art, even if the mass member is eccentric force inside the oil cylinder to be elastically supported horizontally in the axial direction by a pair of oil spring to increase the operation reliability The object is to provide an oil supply device for a linear compressor.

The oil supply device of the linear compressor according to the present invention for solving the above problems is installed under the structure consisting of a cylinder, a piston and a linear motor to pump the oil stored in the lower part of the shell to circulate between the piston and the cylinder, A main body frame fixing the cylinder and the linear motor, an oil supply flow path formed inside the main body frame to communicate with an oil circulation flow path between the cylinder and the piston, and formed on one surface of the main body frame to communicate with the oil supply flow path An oil cylinder, which is installed on the other surface of the main body frame so as to communicate with the oil supply passage, and regulates the supply of oil, and both ends of the oil cylinder are elastically supported by a pair of oil springs. A mass member installed to reciprocate linearly, and A spring is a configuration including opposite ends and end, and the opposite direction side of the oil feed valve guide means for the elastic support between the assembly of the oil cylinder of the mass member.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a side sectional view showing an oil supply device of the linear compressor according to the present invention, Figures 3 and 4 are shown the first and second embodiments of the oil spring support structure in the oil supply device of the linear compressor according to the present invention Side cross section view.

The oil supply device of the linear compressor according to the present invention has a piston 54 under the structure 51 configured to be driven by a linear motor (not shown) inside the cylinder 52 to reciprocate linear motion, as shown in FIG. 2. It is installed to pump the oil stored in the lower portion of the shell (not shown), which is a closed space, in more detail so that one end of the oil cylinder 72 is connected to one bottom surface of the body frame 53 to which one end of the cylinder 52 is fixed. A fixed cap 78 formed integrally and fixed to the other end of the oil cylinder 72 by the first and second oil springs 76a and 76b at both ends of the mass member 74 inside the oil cylinder 72. And an eccentric force on the oil supply valve assembly 80 fixed to the other side of the lower end of the main frame 53, in particular the mass member 74, the fixing cap 78, and the oil supply valve assembly 80. Even if this happens, the first and second oil springs 76a and 76b Guide means for horizontally supporting in the axial direction are provided.

Here, one end of the cylinder 52 is fixed to the body frame 53, one end of the piston 54 is inserted from the other end of the cylinder 54 to form a compression space (P) therebetween. A thin suction valve 56 is provided at one end of the piston 54 to adjust the suction of the refrigerant, and a discharge valve 58a and a discharge cap 58b for controlling the discharge of the refrigerant are provided at one end of the cylinder 54. ) And a discharge valve assembly 58 composed of a discharge valve spring 58c.

Of course, as the linear motor is driven, the pressure in the compression space P is varied while the piston 54 reciprocates linearly. Accordingly, the refrigerant is sucked into the compression space P, compressed, and then discharged. As the vibration is generated by such an operation, the oil stored in the bottom surface of the shell is pumped by the oil supply device and circulated.

More specifically, an oil circulating flow path 60 is formed between the cylinder 52 and the piston 54 to circulate oil between the cylinder 52 and the piston 54 through the oil supply device, and at the same time, the body An oil supply passage 62 and an oil recovery passage 64 are formed in the frame 53 so as to communicate with the oil circulation passage 60, and the oil circulation passage 62 has an inner circumferential surface of the cylinder 52 and a piston in contact therewith. (54) A ring-shaped cylinder groove 52h and a piston groove 54h are formed on the outer circumferential surface to have a predetermined length in the axial direction, respectively.

At this time, the lower end of the oil supply passage 62 is installed to communicate with the oil supply pipe 71 is installed so that the end is contained in the oil stored in the bottom surface of the shell to allow the oil to flow.

Next, the oil cylinder 72 is formed so that one end is integrally connected to the lower surface of the main body frame 53, and a separate fixing cap 78 is mounted to block the other end, and the inner diameter is uniformly formed. It is desirable to be.

At this time, the oil cylinder 72 is installed so that its inner diameter extends to the other side of the lower end of the main body frame 53, so that the oil supply passage 62 also communicates with the other side of the lower end of the main body frame 53. Is formed.

Next, the mass member 74 generates a pressure difference while reciprocating linearly moving inside the oil cylinder 72, so that both ends thereof are elastically supported in the axial direction by the first and second oil springs 76a and 76b. Is installed.

Specifically, as shown in FIG. 3, the mass member 74 has a diameter of the mass body 74a formed to have a diameter maintaining a gap between the inner diameter of the oil cylinder 72 and a portion of both ends thereof toward the end thereof. It is configured to include the smaller inclined portions 74c and 74c '.

At this time, the mass member 74 reciprocates linearly inside the oil cylinder 72, while the mass body 74a generates a pressure difference inside the oil cylinder 72, while the inclined portion 74c, 74c ') imparts a wedge effect to the mass body 74a to further enhance the kinetic force, and the inclined portions 74c and 74c even when the eccentric force due to vibration is inclined to act on the mass body 74a. ') Is formed with a further gap with the oil cylinder 72 can reduce wear due to friction.

In addition, the first and second oil springs (76a, 76b) is applied to the coil spring to give an elastic force in the axial direction, the first oil spring (76a) is one end of the mass member 74 and the fixed cap ( 78), the second oil spring 76b is directly supported between the other end of the mass member 74 and the oil supply valve assembly 80.

Next, the oil supply valve assembly 80 is installed on the other side of the lower end of the body frame 53, and is also installed to communicate with the oil supply passage 62 and the oil cylinder 72 to supply oil by a pressure difference. Pump it up.

Specifically, the oil supply valve assembly 80 is a portion of the thin plate is cut to form an oil suction valve and the oil discharge valve to control the oil intake and discharge of the valve seat (not shown) and overlap the oil to be temporarily stored It is composed of a seat cover (not shown) to form a suction storage space corresponding to the oil suction valve and the discharge storage space corresponding to the oil discharge valve, so that the thin between the valve seat and the seat cover to prevent the leakage of oil Gaskets (not shown) and the like are further installed.

At this time, the valve seat is installed so as to contact the other bottom surface of the body frame 53, the seat cover is overlapped with the valve seat is bolted to the other bottom surface of the body frame 53, the valve seat The suction storage space of the oil suction valve and the seat cover is installed to communicate with the oil cylinder 72 and the discharge storage space of the oil discharge valve and the seat cover of the valve seat is communicated with the oil supply passage 62. do.

Of course, it is preferable that grooves having various shapes are formed on the other surface of the main body frame 53 so that the suction storage space and the discharge storage space communicate with each other by engaging the valve seat and the seat cover.

In particular, the guide means may include the movable guide protrusions 74b and 74b 'protruding axially at both ends of the mass member 74, the fixed cap 78 and the oil supply valve assembly 80, respectively. The first and second oil springs are formed of the fixed guide protrusions 78a and 78b protruding inwardly of the cylinder 72, respectively, and the movable guide protrusions 74b and 74b 'and the fixed guide protrusions 78a and 78b. 76a and 76b are fitted and supported to be axially horizontal.

At this time, the movable guide protrusion (74b, 74b ') is located at the center of both ends of the mass member 74 so as to correspond to the center of the diameter of the oil cylinder (72) of the first and second oil spring (76a, 76b) It is formed to have the same diameter as the inner diameter, so that one end of the first and second oil springs (76a, 76b) can be fitted and fixed.

Of course, the mass member 74 may be configured such that the movable guide protrusions 74b and 74b 'are stepped with respect to the inclined portions 74c and 74c', as shown in FIG. As described above, the first and second oil springs may be formed by forming the mass members 174 to form inclined guide protrusions 174b and 174b 'formed so as to have diameters smaller toward both ends of the cylindrical body 174a. 76a, 76b) may be fitted to secure the wedge effect between the inner circumferential surface of the oil cylinder 72 and at the same time.

On the other hand, the fixed guide projections 78a and 78b respectively correspond to the inner center of the fixed cap 78 or the oil supply valve assembly 80 opposite in the axial direction so as to correspond to the diameter center of the oil cylinder 72. Is positioned and formed to have the same diameter as the inner diameter of the first, second oil springs (76a, 76b), in addition to the cylindrical shape so that the other end of the first, second oil springs (76a, 76b) can be easily fitted It may be configured in various shapes such as.

Of course, the fixed guide 78b on the side of the oil supply valve assembly may be formed in any one of the valve seat or the seat cover, but is preferably formed in the seat cover to increase the holding force.

Looking at the assembly process of the oil supply device configured as described above, one end of the oil cylinder 72 is integrally processed so as to be connected to the lower surface of the body frame 53, and then the oil supply valve assembly 80 is the body frame It is fixed to the other side of the 53, the oil inlet pipe 71 is also communicated with the oil supply passage 62 is installed so that the end thereof is close to the bottom surface inside the shell.

At this time, the oil supply valve assembly 80 is preferably installed so that the fixed guide projection (78b) is in communication with the oil cylinder (72).

Thereafter, the movable guide protrusions 74b and 74b 'of the mass member are fitted to one ends of the first and second oil springs 76a and 76b, respectively, and then the fixed guide protrusions 78a on the fixing cap side are formed. It is fitted to the other end of the one oil spring 76a to constitute the assembly.

Thereafter, the assembly inserts the mass member 74 and the first and second oil springs 76a and 76b from the other end of the oil cylinder 72, wherein the fixing cap 78 is the oil cylinder 72. When fixed to the other end of the, at the same time the fixed guide projection (78b) of the oil supply valve assembly side is assembled to be fitted to the other end of the second oil spring (76b).

Accordingly, the first and second oil springs 76a and 76b are movable guide protrusions 74b and 74b 'on the mass member side, fixed guide protrusions 78a of the discharge cap, and fixed guide protrusions of the oil supply valve assembly. Since the first and second oil springs 76a and 76b are installed to be fixed to the fixed guide protrusions 78a and 78b because the mass members are installed to be fitted to the 78b, respectively, the eccentric force acts on the mass member. Direction can be recovered horizontally, and as the wedge-shaped space is formed between the inner circumferential surface of the oil cylinder 72 and the inclined portions 74c and 74c 'of the mass member, the mass member 74 is connected to the oil cylinder. The wedge effect is generated during the reciprocating linear motion from the inside 72 to increase the kinetic force of the mass member 74.

In the above, the present invention has been described in detail by way of examples based on the embodiments of the present invention and the accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the contents described in the claims below.

The oil supply apparatus of the linear compressor according to the present invention configured as described above has oil springs respectively fixed to the fixed guide protrusions on the fixed cap side and the fixed guide protrusions on the fixed cap side of the mass member inside the oil cylinder. Since it is fitted and elastically supported, even if the mass member is subjected to an eccentric force inside the oil cylinder, not only does it prevent the oil springs from shifting, but also it can be kept horizontal in the axial direction, and as a result, the mass member can be prevented from rubbing against the oil cylinder. Not only can it increase the reliability of its operation.

Claims (3)

In the oil supply device of the linear compressor which is installed under the structure consisting of a cylinder, a piston and a linear motor to pump oil stored in the lower part of the shell to circulate between the piston and the cylinder, A main body frame fixing the cylinder and the linear motor, An oil supply passage formed inside the main body frame and in communication with an oil circulation passage between the cylinder and the piston; An oil cylinder formed on one surface of the main body frame so as to communicate with the oil supply passage; An oil supply valve assembly installed on the other side of the main body frame so as to communicate with the oil supply flow path to regulate supply of oil; A mass member installed at both ends of the oil cylinder to be elastically supported by a pair of oil springs so as to reciprocate linearly; And guide means for elastically supporting the oil springs between the both ends of the mass member, the end of the oil cylinder, and the oil supply valve assembly on the opposite side thereof. The method of claim 1, The guide means may be movable guide protrusions axially projected to be located at both centers of the mass member, respectively, and fixed guide protrusions protruded from the end of the oil cylinder and the oil supply valve assembly to be located at the center of the inner diameter of the oil cylinder. Oil supply device of the linear compressor comprising a. The method according to claim 1 or 2, The mass member is an oil supply apparatus of the linear compressor, characterized in that it comprises a slope formed in a portion of both ends toward the end smaller in diameter.

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